UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 10-K

X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2015 .
OR
__ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from __________ to __________.
Commission file number   001-36108
ONE Gas, Inc.

(Exact name of registrant as specified in its charter)

	
		
Oklahoma	46-3561936	
(State or other jurisdiction of
incorporation or organization)	(I.R.S. Employer Identification No.)

15 East Fifth Street, Tulsa, OK	74103	
(Address of principal executive offices)	(Zip Code)	
Registrant’s telephone number, including area code   (918) 947-7000
Securities registered pursuant to Section 12(b) of the Act:

		
Common stock, par value of $0.01	New York Stock Exchange	
(Title of each class)	(Name of each exchange on which registered)	
Securities registered pursuant to Section 12(g) of the Act:  None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes X No__
 
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes __  No X
 
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes X   No __

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes X No _
 
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Registration S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. X
 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check one) Large accelerated filer X  Accelerated filer __    Non-accelerated filer __    Smaller reporting company __
 
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes__ No X
The aggregate market value of the equity securities held by nonaffiliates based on the closing trade price of the registrant on June 30, 2015, was $2.1 billion.
 
On February 5, 2016 , we had 52,292,154 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:
Portions of the definitive proxy statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held May 26, 2016, are incorporated by reference in Part III.

ONE Gas, Inc.
2015 ANNUAL REPORT

				
Part I.
	 	 	Page No.	
Item 1.	Business	 	5	
Item 1A.	Risk Factors	 	13	
Item 1B.	Unresolved Staff Comments	 	23	
Item 2.	Properties	 	23	
Item 3.	Legal Proceedings	 	24	
Item 4.	Mine Safety Disclosures	 	24	
Part II.	 	 	 	
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases
of Equity Securities	 	25	
Item 6.	Selected Financial Data	 	27	
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations  	 	27	
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	 	43	
Item 8.	Financial Statements and Supplementary Data	 	45	
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	 	82	
Item 9A.	Controls and Procedures	 	82	
Item 9B.	Other Information	 	82	
Part III.	 	 	 	
Item 10.	Directors, Executive Officers and Corporate Governance	 	82	
Item 11.	Executive Compensation	 	83	
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder
Matters	 	83	
Item 13.	Certain Relationships and Related Transactions, and Director Independence	 	84	
Item 14.	Principal Accounting Fees and Services	 	84	
Part IV.	 	 	 	
Item 15.	Exhibits, Financial Statement Schedules	 	85	
Signatures	 	 	89	

As used in this Annual Report, references to “we,” “our,” “us” or the “company” refer to ONE Gas, Inc., an Oklahoma corporation, and its predecessors and subsidiary, unless the context indicates otherwise.

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GLOSSARY

The abbreviations, acronyms and industry terminology used in this Annual Report are defined as follows:

		
ACA	Annual Cost Adjustment	
AFUDC	Allowance for funds used during construction	
Annual Report	Annual Report on Form 10-K for the year ended December 31, 2015	
ATSR	Ad Valorem Tax Surcharge Rider	
Bcf	Billion cubic feet	
Bcf/d	Billion cubic feet per day	
CERCLA	Federal Comprehensive Environmental Response, Compensation and Liability Act
of 1980, as amended	
CFTC	Commodities Futures Trading Commission	
Clean Air Act	Federal Clean Air Act, as amended	
Clean Water Act	Federal Water Pollution Control Amendments of 1972, as amended	
Code	Internal Revenue Code of 1986, as amended	
COG	Cost of gas	
COGR	Cost of gas rider	
COSA	Cost-of-Service Adjustment	
DOT	United States Department of Transportation	
Dth	Dekatherm	
EPA	United States Environmental Protection Agency	
EPARR	El Paso Annual Rate Review	
EPS	Earnings per share	
EPSA	El Paso Service Area	
Exchange Act	Securities Exchange Act of 1934, as amended	
FERC	Federal Energy Regulatory Commission	
GAAP	Accounting principles generally accepted in the United States of America	
GRIP	Texas Gas Reliability Infrastructure Program	
GSRS	Gas System Reliability Surcharge	
Heating Degree Day or HDD	A measure designed to reflect the demand for energy needed for heating based on
the extent to which the daily average temperature falls below a reference
temperature for which no heating is required, usually 65 degrees Fahrenheit	
IFRS	International Financial Reporting Standards	
IRS	U.S. Internal Revenue Service	
IRS Ruling	Private Letter Ruling from IRS	
KCC	Kansas Corporation Commission	
KDHE	Kansas Department of Health and Environment	
LDCs	Local distribution companies	
LIBOR	London Interbank Offered Rate	
Moody’s	Moody’s Investors Service, Inc.	
MMcf	Million cubic feet	
NYSE	New York Stock Exchange	
OCC	Oklahoma Corporation Commission	
ONE Gas	ONE Gas, Inc.	
ONE Gas Credit Agreement	ONE Gas’ $700 million revolving credit agreement, which expires in January
2019	
ONE Gas Predecessor	ONE Gas’ predecessor for accounting purposes that consists of the business
attributable to ONEOK’s natural gas distribution segment that was transferred to
ONE Gas in connection with its separation from ONEOK	
ONEOK	ONEOK, Inc. and its subsidiaries	
ONEOK Partners	ONEOK Partners, L.P. and its subsidiaries	
OSHA	Occupational Safety and Health Administration	
PBRC	Performance-Based Rate Change	
PGA	Purchased Gas Adjustment	

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PHMSA	United States Department of Transportation Pipeline and Hazardous Materials
Safety Administration	
Pipeline Safety Improvement Act	Pipeline Safety Improvement Act of 2002, as amended	
Pipeline Safety, Regulatory Certainty and
Job Creation Act	Pipeline Safety, Regulatory Certainty and Job Creation Act of 2011, as amended	
ROE	Return on equity calculated consistent with utility ratemaking principles in each
jurisdiction in which we operate	
RRC	Railroad Commission of Texas	
S&P	Standard and Poor’s Rating Services	
SEC	Securities and Exchange Commission	
Securities Act	Securities Act of 1933, as amended	
Separation and Distribution Agreement	Separation and Distribution Agreement dated January 14, 2014, between ONEOK
and ONE Gas	
TAC	Temperature Adjustment Clause	
Tax Matters Agreement	Tax Matters Agreement dated January 14, 2014, between ONEOK and ONE Gas	
Transition Services Agreement	Transition Services Agreement dated January 14, 2014, between ONEOK
and ONE Gas	
WNA	Weather normalization adjustments	
XBRL	eXtensible Business Reporting Language	

The statements in this Annual Report that are not historical information, including statements concerning plans and objectives of management for future operations, economic performance or related assumptions, are forward-looking statements. Forward-looking statements may include words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled” and other words and terms of similar meaning.  Although we believe that our expectations regarding future events are based on reasonable assumptions, we can give no assurance that such expectations and assumptions will be achieved.  Important factors that could cause actual results to differ materially from those in the forward-looking statements are described under Part I, Item 1A, “Risk Factors,” and Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operation and “Forward-Looking Statements,” in this Annual Report.

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PART I

ITEM 1.    BUSINESS

SEPARATION FROM ONEOK, INC.

On January 8, 2014, ONEOK’s board of directors approved the distribution of all the shares of our common stock to holders of ONEOK common stock.

In order for ONEOK to effect the distribution, we requested, and the SEC declared effective, our Registration Statement on Form 10 on January 10, 2014. ONEOK transferred all of the assets and liabilities primarily related to its natural gas distribution business to us. Assets and liabilities included accounts receivable and payable, natural gas in storage, regulatory assets and liabilities, pipeline and other natural gas distribution facilities, customer deposits, employee-related assets and liabilities, including amounts attributable to pension and other postemployment benefits, tax-related assets and liabilities and other assets and liabilities primarily associated with providing natural gas distribution service in Oklahoma, Kansas and Texas. Cash and certain corporate assets, such as office space in the corporate headquarters and certain IT hardware and software, were not transferred to us; however, the Transition Services Agreement between ONEOK and us provided temporary access to such corporate assets as necessary to operate our business prior to obtaining applicable corporate assets on our own.

Immediately prior to the contribution of the natural gas distribution business to us, ONEOK contributed to the capital of the natural gas distribution business all of the amounts outstanding on the natural gas distribution business’s short-term note payable to and long-term line of credit with ONEOK. We received approximately $1.19 billion of cash from a private placement of senior notes (which were later exchanged for registered notes), then used a portion of those proceeds to fund a cash payment of approximately $1.13 billion to ONEOK. On January 31, 2014, ONEOK distributed one share of our common stock for every four shares of ONEOK common stock held by ONEOK shareholders of record as of the close of business on January 21, 2014, the record date of the distribution. At the close of business on January 31, 2014, ONE Gas became an independent, publicly traded company as a result of the distribution. Our common stock began trading “regular-way” under the ticker symbol “OGS” on the NYSE on February 3, 2014. ONEOK did not retain any ownership interest in our company.

OUR BUSINESS

We are an independent, publicly traded, 100 percent regulated natural gas distribution utility. We are one of the largest natural gas utilities in the United States. We are an Oklahoma corporation and are the successor to the company founded in 1906 as Oklahoma Natural Gas Company. We are the largest natural gas distributor in Oklahoma and Kansas and the third largest in Texas, providing service as a regulated public utility. We serve residential, commercial and industrial, transportation and wholesale and public authority customers in all three states. Our largest natural gas distribution markets in terms of customers are Oklahoma City and Tulsa, Oklahoma; Kansas City, Wichita and Topeka, Kansas; and Austin and El Paso, Texas. Our three divisions, Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, distribute natural gas as public utilities to approximately 88 percent, 72 percent and 14 percent of the natural gas distribution customers in Oklahoma, Kansas and Texas, respectively.

Prior to our separation from ONEOK, our financial statements were derived from ONEOK’s financial statements, which included its natural gas distribution business as if we, for accounting purposes, had been a separate company for all periods presented. The assets and liabilities in the financial statements have been reflected on a historical basis. The financial statements for periods prior to the separation also include expense allocations for certain corporate functions historically performed by ONEOK, including allocations of general corporate expenses related to executive oversight, accounting, treasury, tax, legal, information technology and other services. We believe our assumptions underlying the financial statements, including the assumptions regarding the allocation of general corporate expenses from ONEOK, are reasonable. However, the financial statements may not include all of the actual expenses that would have been incurred by us and may not reflect our results of operations, financial position and cash flows had we been a separate publicly traded company during the periods presented prior to the separation.

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OUR STRATEGY

Our business strategy is focused on operating our systems in a safe, reliable and environmentally responsible manner, growing our business strategically, while delivering quality customer service to our customers. Over time, we believe this will enable us to generate a competitive total return for our shareholders and maintain our financial stability, leading to our strategic goals of zero harm and a fair return. We intend to accomplish our objectives by executing on the strategies listed below:

•	Focus on Safety, Reliability and Compliance - We are committed to pursuing a zero-incident safety and compliance culture through programs, procedures, policies, guidelines and other internal controls designed to mitigate risk and incidents that may harm our employees, contractors, customers, the public or the environment. In addition, a significant portion of our capital spending is focused on the safety, reliability and efficiency of our natural gas distribution system. We are committed to compliance with all federal, state and local laws and regulations.	

•	High-performing Workforce - The foundation of our company consists of our employees. We are committed to attracting, retaining and developing a high-performing workforce where every employee understands that they can and do make a difference. We embrace and promote inclusion, diversity and collaboration. We expect a high standard of performance from our employees. We encourage our workforce to measure their productivity and be accountable for the best work possible. Each day that we do our best to safely and efficiently meet the needs of our customers is a day that leads to individual success and, ultimately, the success of the company.	

•	Increase Our Achieved ROE - We continually seek to improve our achieved ROE through improved operational performance and regulatory mechanisms. The difference between our achieved and allowed ROE is related primarily to regulatory lag. We make investments that increase our rate base and we incur increases in our costs that are above the amounts reflected in the rates we charge for our service.	

We have several initiatives underway to improve our operational performance. These initiatives include leveraging and implementing technology that is expected to result in increased efficiency, thereby helping reduce the rate of increase in operating expenses.

Our focus on our credit metrics and maintaining a balanced approach to capital management are significant objectives in providing reasonable rates to customers while also providing a fair return to shareholders. We believe that maintaining an investment-grade credit rating is prudent for our business as we seek to access the capital markets to finance capital investments. As a 100 percent regulated utility, we intend to maintain strong credit metrics while we pursue a balanced approach to capital investment and a return of capital to shareholders via a dividend that we believe will be competitive with our peer group.

•	Advocate Constructive Relationships with Key Stakeholders - We plan to continue our constructive, transparent relationships with our key stakeholders, which include our customers, employees, investors and regulators. Our strategy includes seeking outcomes in future rate proceedings that provide a fair return on our infrastructure investments, while also meeting the needs of our customers through safe, reliable and efficient service.	

•	Identify and Pursue Growth Opportunities - Our growth opportunities are a result of capital investments related to safety and reliability of our existing system, and system growth related to the economic and population growth in our service territories. As a result of our commitment to enhance the integrity, reliability and safety of our existing infrastructure, we are making significant investments in our existing system, which we expect to further grow our rate base. In addition, as our service territories continue to experience economic growth, we expect to grow our rate base through capital investments in new service lines and main line extensions, predominately in the major metropolitan areas.	

We believe that the competitiveness of natural gas is increasing, creating new market opportunities for natural gas as an energy source within our existing service territories.

We remain committed to maintaining our status as a 100 percent regulated company, but will evaluate strategic acquisition opportunities that fall within that guideline based on our disciplined financial and operating approach, while weighing these alternatives against future investment opportunities with respect to our existing rate base.

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REGULATORY OVERVIEW

We are subject to the regulations and oversight of the state and local regulatory authorities of the territories in which we operate. Rates and charges for natural gas distribution services are established by the OCC for Oklahoma Natural Gas and by the KCC for Kansas Gas Service. Texas Gas Service is subject to regulatory oversight by the various municipalities that it serves, which have primary jurisdiction in their respective areas. Rates in unincorporated areas of Texas and all appellate matters are subject to regulatory oversight by the RRC. These regulatory authorities have the responsibility of ensuring that the utilities in their jurisdictions provide safe and reliable service at a reasonable cost, while providing utility companies the opportunity to earn a fair and reasonable return on their investments.

Generally, our rates and charges are established in rate case proceedings. Regulatory authorities may also approve mechanisms that allow for adjustments for specific costs or investments made between rate cases. Due to the nature of the regulatory process, there is an inherent lag between the time that we make investments or incur additional costs and the setting of new rates and/or charges to recover those investments or costs. Additionally, we are not allowed recovery of certain costs we incur. The delay between the time investments are made or increases in costs are incurred and the time that our rates are adjusted to reflect these investments and costs is referred to as regulatory lag.

The following provides additional detail on the regulatory mechanisms in the jurisdictions we serve.

Oklahoma - Oklahoma Natural Gas currently operates under a PBRC mechanism, which provides for streamlined annual rate reviews between rate cases and includes adjustments for incremental capital investment and allowed expenses. Under this mechanism, we have an allowed ROE of between 9 percent and 10 percent. If our achieved ROE is below 9 percent, our base rates are increased upon OCC approval to an amount necessary to restore the ROE to 9.5 percent. If our achieved ROE exceeds 10 percent, the portion of the earnings above 10 percent is shared with our customers, who receive the benefit of 75 percent of the earnings above 10 percent. We receive the benefit of the remaining 25 percent. Oklahoma Natural Gas is required to file a rate case on or before June 20, 2021, based on a test year consisting of the twelve months ending December 31, 2020. Other regulatory mechanisms in Oklahoma include the following:

•	PGA Clause - Oklahoma Natural Gas’ commodity, transportation, storage and gas purchase operations and maintenance costs are passed through to its sales customers without markup via the PGA. Any costs associated with natural gas that is lost, used or unaccounted for in operations and the fuel-related portion of bad debts are also recovered through the PGA.	
		
•	TAC - The TAC is designed to reduce the delivery charge component of customers’ bills for the additional volumes used when the actual heating degree days exceed the normalized heating degree days and to increase the delivery charge component of customers’ bills for volumes not used when actual heating degree days are less than the normal heating degree days. The TAC is in effect from November through April.	
		
•	Energy Efficiency Programs - Oklahoma Natural Gas has an Energy-Efficiency Program, available to all of its sales customers.  The costs associated with these programs and an incentive to offer these programs are recovered through a monthly surcharge on customer bills. Oklahoma Natural Gas collects approximately $11.5 million each year from sales customers to fund the program, which provides appliance rebates, education and heating system check-ups to promote energy efficiency.	
		
•	Rate Design for Residential Customers - Oklahoma Natural Gas is authorized to utilize a rate structure with two choices. Rate Choice “A” is designed for customers whose annual normalized volume is less than 50 Dth. The tariff for these customers contains both a fixed monthly service charge and a per Dth delivery fee. Although a portion of the net margin for customers in Rate Choice “A” is dependent on usage, these customers use relatively small quantities of natural gas and therefore the net margin that is dependent on usage is not significant. The fixed monthly residential customer charge for Oklahoma Natural Gas is $16.43, with a delivery fee of $4.1143 per Dth for Rate Choice “A” customers. Rate Choice “B” is designed for customers whose annual normalized volume is 50 Dth or greater. The tariff for these customers contains only a fixed monthly service charge of $33.57. At December 31, 2015, 71 percent of Oklahoma Natural Gas’ residential customers are on Rate Choice “B.”	
		
•	Rate Design for Commercial and Industrial Customers - Oklahoma Natural Gas is authorized to utilize a rate structure with two different rate choices for its Small Commercial and Industrial, or SCI, customers. Rate Choice “A” is designed for SCI customers whose annual normalized volume is less than 40 Dth. The tariff for these customers contains both a fixed monthly service charge of $20.55 and a delivery fee of $4.5599 per Dth. Rate Choice “B” is designed for SCI customers whose annual normalized volume is 40 Dth or greater but less than 150 Dth. The tariff for these customers contains only a fixed monthly service charge of $35.75. All of Oklahoma Natural Gas’ Large Commercial and Industrial, or LCI, customers, whose annual volume is 150 Dth or greater, but less than 5,000 Dth, are on a fixed monthly service charge of $93.22. At December 31, 2015, 75 percent of Oklahoma Natural Gas’ commercial and industrial customers are on either SCI Rate Choice “B” or LCI.	

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•	Compressed Natural Gas Rebate Program - The CNG Rebate Program is designed to promote and support the CNG market in the state of Oklahoma by offering rebates to Oklahoma residents who purchase dedicated and bi-fueled natural gas vehicles or install residential CNG fueling stations. The rebates are funded by a $0.25 per gasoline gallon equivalent surcharge that Oklahoma Natural Gas is authorized to collect on fuel purchased from a CNG dispenser owned by Oklahoma Natural Gas. Collections from the surcharge to fund the program were not material in 2015.	

For the year ended December 31, 2015, approximately 87 percent of Oklahoma Natural Gas’ net margin from its sales customers was recovered from fixed charges.

Kansas - Kansas Gas Service operates under a traditional regulatory framework, whereby periodic rate cases are filed with the KCC as needed to increase base rates to give Kansas Gas Service the opportunity to earn its authorized ROE. Other regulatory mechanisms in Kansas include the following:

•	COGR and ACA - These mechanisms allow Kansas Gas Service to recover the actual cost of the natural gas it sells to its customers. The COGR includes a monthly estimate of the cost Kansas Gas Service incurs in transporting, storing and purchasing natural gas supply for its sales customers, the ACA and other charges and credits. The ACA is an annual component of the COGR that compares the cost of gas recovered through the COGR for the preceding year with the actual natural gas supply costs and the fuel-related portion of bad debts for the same period. Any over- or under-recovery is reflected in the subsequent year’s COGR.	
		
•	WNA Clause - This mechanism allows Kansas Gas Service to accrue the variation in net margin due to abnormal weather occurring from November through March. WNA is designed to reduce the delivery charge component of customers’ bills for the additional volumes used when the actual heating degree days exceed the normalized heating degree days and to increase the delivery charge component of customers’ bills for the reduction in volumes used when actual heating degrees days are less than the normal heating degree days. Once a year, the amount of the adjustment is determined and is then applied to customers’ bills over the subsequent 12-month period.	
		
•	ATSR - This rider allows Kansas Gas Service to recover the difference each year between the property tax costs included in its base rates and its actual property tax costs incurred without having to file a rate case. The amount of the adjustment is determined annually and recovered over the subsequent 12 months as a change in the delivery-charge component of customers’ bills.	
		
•	Pension and Other Postemployment Benefits Trackers - These trackers allow Kansas Gas Service to track and defer for recovery in its next rate case the difference between the pension and other postemployment benefit costs included in base rates and actual expense as determined in accordance with GAAP.	
		
•	GSRS - This surcharge allows Kansas Gas Service to file for a rate adjustment providing a recovery of and return on qualifying infrastructure investments, such as expenditures necessary to meet state and federal pipeline safety requirements and government-required relocation projects incurred, each year between rate case filings. However, rate adjustment filings cannot increase a monthly charge more than $0.40 per residential customer over the most recent GSRS filing. After five annual filings, Kansas Gas Service is required to file a rate case or cease collection of the surcharge.	

The fixed monthly residential customer charge for Kansas Gas Service is $15.35. For the year ended December 31, 2015, approximately 55 percent of Kansas Gas Service ’s net margin from its sales customers was recovered from fixed charges. Kansas e xperiences the highest heating degree days of all of our service territories, which brings a level of stability to net margin even though a significant portion is based on usage.

Texas - Texas Gas Service has grouped its customers into 10 service areas. These service areas are further divided into the incorporated cities and the unincorporated areas, referred to as the environs. The incorporated cities in the service areas have original jurisdiction, with the RRC having appellate authority, and the RRC has original jurisdiction for the environs. Periodic rate cases are filed with the cities or the RRC, as needed, to give Texas Gas Service the opportunity to earn its authorized ROE. Other regulatory mechanisms and constructs in Texas include the following:

•	GRIP Statute - For the incorporated cities in three service areas and the environs for four service areas, comprising 44 percent of Texas Gas Service’s customers, Texas Gas Service makes an annual filing under the GRIP statute, which allows it to recover taxes and depreciation and to earn a return on the annual net increase in investment for the service area. After five annual GRIP filings, Texas Gas Service is required to file a full rate case. A full rate case may be filed at shorter intervals if desired by either Texas Gas Service or the regulator.	
		
•	COSA Filings - In six service areas, comprising 17 percent of its customers, Texas Gas Service makes an annual COSA filing for the incorporated cities. COSA tariffs permit Texas Gas Service to recover return, taxes and depreciation on the annual increases in net investment, as well as annual increases or decreases in certain expenses and	

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revenues. Five of the COSAs have a cap of 3.5 percent to 5 percent on all or a portion of the increase. A full rate case may be filed when desired by Texas Gas Service or the regulator, but is not required.
		
•	EPARR Filings - In the EPSA, comprising 35 percent of its customers, Texas Gas Service makes an annual rate review filing for the incorporated cities. The annual rate review tariff permits Texas Gas Service to recover return, taxes and depreciation on the annual increases in net investment, as well as annual increases or decreases in certain expenses and revenues. There is no cap on the amount of the increase, but the request is subject to review and possible adjustment by the regulator. Upon notice, a full rate case may be filed by Texas Gas Service or the regulator, but is not required. In November 2015, Texas Gas Service notified the cities in the EPSA that it would be filing a full rate case in 2016.	
		
•	WNA Clause - Texas Gas Service employs WNA clauses in eight of its service areas, comprising 62 percent of its customers. In one of the service areas without WNA, which comprises 38 percent of its customers, Texas Gas Service recovers 88 percent of its delivery charge from fixed charges, making revenues in this service area less weather sensitive. WNA is designed to reduce the delivery charge component of customers’ bills for the additional volumes used when the actual heating degree days exceed the normalized heating degree days and to increase the margin component of customers’ bills for the reduction in volumes used when actual heating degree days are less than the normal heating degree days. The WNA is in effect from September through May.	
		
•	COG Clause - In all service areas, Texas Gas Service recovers 100 percent of its gas costs, including interest on natural gas in storage and the natural gas cost component of bad debts, via a COG mechanism, subject to a limitation of 5 percent on lost-and-unaccounted-for natural gas. The COG is reconciled annually to compare the gas costs recovered through the COG with the actual natural gas supply costs. Any over- or under-recovery is refunded or recovered, as applicable, in the subsequent year.	
		
•	Pension and Other Postemployment Benefits - Texas Gas Service is authorized by statute to defer pension and other postemployment benefit costs that exceed the amount recovered in base rates, and to seek recovery of the deferred costs in a future rate case.	
		
•	Pipeline-Integrity Testing Riders - Texas Gas Service recovers approximately 90 percent of its pipeline-integrity testing expenses via riders, COSAs and the EPARR filing, with the remainder included in base rates.	
		
•	Safety-Related Plant Replacements - Texas Gas Service is authorized by RRC rule to defer interest cost, taxes and depreciation expense on safety-related plant replacements from the time the replacements are in service until the plant is reflected in base rates, and to seek recovery of those accrued amounts in a future rate proceeding.	
		
•	Energy Conservation Program - Texas Gas Service has an Energy Conservation Program in its Central Texas service area, comprising 34 percent of total customers. Texas Gas Service collects approximately $3 million per year from customers to fund the program, which provides energy audits, weatherization and appliance rebates to promote energy conservation.	

The average fixed monthly residential customer charge for Texas Gas Service is $15.41, and for the year ended December 31, 2015, approximately 72 percent of Texas Gas Service’s net margin from its sales customers was recovered fr om fixed charges.

MARKET CONDITIONS AND SEASONALITY

Supply - We purchased 157 Bcf and 180 Bcf of natural gas supply in 2015 and 2014, respectively. The decrease in 2015 resulted primarily from lower supply requirements due to warmer temperatures as compared with 2014. Our natural gas supply portfolio consists of long-term, seasonal and short-term contracts from a diverse group of suppliers. We award these contracts through competitive-bidding processes to ensure reliable and competitively priced natural gas supply. We acquire our natural gas supply from natural gas processors, marketers and producers.

An objective of our supply-sourcing strategy is to provide value to our customers through reliable, competitively priced and flexible natural gas supply and transportation from multiple production areas and suppliers. This strategy is designed to mitigate the impact on our supply from physical interruption, financial difficulties of a single supplier, natural disasters and other unforeseen force majeure events, as well as to ensure these resources are reliable and flexible to meet the variations of customer demands.

We do not anticipate problems with securing natural gas supply to satisfy customer demand; however, if supply shortages were to occur, we have curtailment tariff provisions in place that allow us to reduce or discontinue natural gas service to large industrial users and to request that residential and commercial customers reduce their natural gas requirements to an amount essential for public health and safety. In addition, during times of critical supply disruptions, curtailments of deliveries to customers with firm contracts may be made in accordance with guidelines established by appropriate federal, state and local regulatory agencies.

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Natural gas supply requirements are affected by weather conditions. In addition, economic conditions impact the requirements of our commercial and industrial customers. Natural gas usage per residential customer may decline as customers change their consumption patterns in response to a variety of factors, including:

•	more volatile and higher natural gas prices;	
		
•	customers’ improving the energy efficiency of existing homes by replacing doors and windows, adding insulation, and replacing appliances with more efficient appliances;	
		
•	more energy-efficient construction; and	
		
•	fuel switching from natural gas to electricity.	

In each jurisdiction in which we operate, changes in customer-usage profiles are considered in the periodic redesign of our rates.

As of December 31, 2015, we had 50.4 Bcf of natural gas storage capacity under lease with remaining terms ranging from one to ten years and maximum allowable daily withdrawal capacity of approximately 1.3 Bcf. This storage capacity allows us to purchase natural gas during the off-peak season and store it for use in the winter periods . This storage is also needed to assure the reliability of gas deliveries during peak demands for natural gas. Approximate ly 25 per cent of our winter natural gas supply needs for our sales customers is expected to be supplied from storage.

In managing our natural gas supply portfolios, we partially mitigate price volatility using a combination of financial derivatives and natural gas in storage. We have natural gas financial hedging programs that have been authorized by the regulatory authorities in each state in which we do business. We do not utilize financial derivatives for speculative purposes, nor do we have trading operations associated with our business.

Demand - See discussion below under “Seasonality,” “Competition” and “Compressed Natural Gas” for factors affecting demand for our services.

Seasonality - Natural gas sales to residential and commercial customers are seasonal, as a substantial portion of their natural gas requirements are for heating. Accordingly, the volume of natural gas sales is higher normally during the months of November through March than in other months of the year. The impact on our margins resulting from weather temperatures that are above or below normal is offset partially through our TAC and WNA mechanisms. See discussion above under “Regulatory Overview.”

Competition - We encounter competition based on customers’ preference for natural gas, compared with other energy alternatives and their comparative prices. We compete to supply energy for space and water heating, cooking, clothes drying and other general energy needs. Significant energy usage competition occurs between natural gas and electricity in the residential and small commercial markets. Customers and builders typically make the decision on the type of equipment, and therefore the energy source, at initial installation, generally locking in the chosen energy source for the life of the equipment. Changes in the competitive position of natural gas relative to electricity and other energy alternatives have the potential to cause a decline in consumption of natural gas or in the number of natural gas customers.

The Department of Energy issued a statement of policy that it will use full fuel-cycle measures of energy use and emissions when evaluating energy-conservation standards for appliances. In addition, the EPA has determined that source energy is the most equitable unit for evaluating energy consumption. Assessing energy efficiency in terms of a full fuel-cycle or source-energy analysis, which takes all energy use into account, including transmission, delivery and production losses, in addition to energy consumed at the site, highlights the high overall efficiency of natural gas in residential and commercial uses compared with electricity.

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The below table contains data related to the cost of our delivered gas relative to electricity based on current market conditions:

													
Natural Gas vs. Electricity	 	Oklahoma	 	Kansas	 	Texas	
 	 	 	 	 	 	 	
Average retail price of electricity / kWh (1)	 	10.09¢	 	12.31¢	 	11.67¢	
Natural gas price equivalent of electricity / Dth (1)	 	$	29.57		 	$	36.08		 	$	34.20		
ONE Gas delivered cost of natural gas / Dth (2)	 	$	9.29		 	$	9.98		 	$	10.39		
Natural gas advantage ratio (3)	 	3.2x		 	3.6x		 	3.3x		
(1) Source: United States Energy Information Agency, www.eia.gov, for the eleven-month period ended November 30, 2015.
(2) Represents the average delivered cost of natural gas to a residential customer, including the cost of the natural gas supplied, fixed customer charge, delivery charges and charges for riders, surcharges and other regulatory mechanisms associated with the services we provide, for the year ended December 31, 2015.
(3) Calculated as the ratio of the natural gas price equivalent per dekatherm of the average retail price of electricity per kilowatt hour to the ONE Gas delivered average cost of natural gas per dekatherm.

We are subject to competition from other pipelines for our large industrial and commercial customers, and this competition has and may continue to impact margins. Under our transportation tariffs, qualifying industrial and commercial customers are able to purchase their natural gas needs from the supplier of their choice and have us transport it for a fee. A portion of the transportation services that we provide are at negotiated rates that are below the maximum approved transportation tariff rates. Reduced-rate transportation service may be negotiated when a competitive pipeline is in close proximity or another viable energy option is available to the customer. Increased competition could potentially lower these rates.

Compressed Natural Gas (CNG) - In meeting increased interest in CNG for motor vehicle transportation, particularly from fleet operators, we have been developing an incremental source of transportation revenue by supplying natural gas to CNG fueling stations. The benefits of these programs are increased natural gas load, which could help mitigate future residential rate increases, enhanced competitive position and increased customer satisfaction. As of December 31, 2015, we supply 129 fueling stations, 30 of which we operate. Of the 99 remaining stations, we provide supply to 56 retail and 43 private CNG stations. We transported 2.3 million Dth to CNG stations in 2015, which represents an increase of 14 percent compared with 2014.

We will continue to support industry efforts to encourage development of more vehicle options by car and truck manufacturers, to support third-party investment in CNG fueling stations and to continue tax incentives for CNG. We continue to deploy a minimum amount of capital to connect CNG stations and allow the free market to build and operate the stations.

ENVIRONMENTAL AND SAFETY MATTERS

See Note 14 of the Notes to Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations in this Annual Report for information regarding environmental and safety matters.

EMPLOYEES

We employed approximately 3,400 people at January 29, 2016 , including approximately 700 people at Kansas Gas Service who are subject to collective bargaining agreements. The following table sets forth our contracts with collective bargaining units at February 1, 2016 :

					
Union	 	Approximate Employees	 	Contract Expires	
The United Steelworkers	 	400	 	October 28, 2016	
International Brotherhood of Electrical Workers (IBEW)	 	300	 	June 30, 2017	

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EXECUTIVE OFFICERS OF THE REGISTRANT

All executive officers are elected annually by our Board of Directors and each serves until such person resigns, is removed or is otherwise disqualified to serve or until such officer’s successor is duly elected. Our executive officers listed below include the officers who have been designated by our Board of Directors as our Section 16 executive officers.

					
Name	Age*	 	Business Experience in Past Five Years	
Pierce H. Norton II	55	2014 to present	President, Chief Executive Officer and Director	
 	 	2013 to 2014	Executive Vice President, Commercial, ONEOK and ONEOK Partners	
 	 	2012	Executive Vice President and Chief Operating Officer, ONEOK and ONEOK Partners	
 	 	2011	Chief Operating Officer, ONEOK	
 	 	2009 to 2011	President, ONEOK Distribution Companies, ONEOK	
Curtis L. Dinan	48	2014 to present	Senior Vice President, Chief Financial Officer and Treasurer	
 	 	2011 to 2014	Senior Vice President, Natural Gas, ONEOK Partners	
 	 	2007 to 2011	Senior Vice President, Chief Financial Officer and Treasurer, ONEOK and ONEOK Partners	
 	 	2007 to 2011	Board of Directors, ONEOK Partners	
Joseph L. McCormick	56	2014 to present	Senior Vice President, General Counsel and Assistant Secretary	
 	 	2008 to 2014	Vice President and Associate General Counsel, ONEOK and ONEOK Partners	
Caron A. Lawhorn	54	2014 to present	Senior Vice President, Commercial	
 	 	2013 to 2014	Senior Vice President, Commercial, Natural Gas Distribution, ONEOK	
 	 	2011 to 2012	President, ONEOK Distribution Companies, ONEOK	
 	 	2009 to 2011	Senior Vice President, Corporate Planning and Development, ONEOK and ONEOK Partners	
Robert S. McAnnally	52	2015 to present	Senior Vice President, Operations	
 	 	2012 to 2015	Senior Vice President, Marketing and Customer Service, Alabama Gas Corporation, a subsidiary of The Laclede Group, Inc.	
 	 	2009 to 2012	Vice President, External Affairs, Energen Corporation	
Mark A. Bender	51	2015 to present	Senior Vice President, Administration and Chief Information Officer	
 	 	2014 to 2015	Vice President and Chief Information Officer	
 	 	2012 to 2014	Vice President of Information Technology Operations, Chesapeake Energy Corporation	
 	 	2010 to 2012	Chief Information Officer, Oral Roberts University	
* As of January 1, 2016	 	 	 	 	

No family relationship exists between any of the executive officers, nor is there any arrangement or understanding between any executive officer and any other person pursuant to which the officer was selected.

INFORMATION AVAILABLE ON OUR WEBSITE

We make available, free of charge, on our website ( www.onegas.com ) copies of our Annual Report, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, amendments to those reports filed or furnished to the SEC pursuant to Section 13(a) or 15

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(d) of the Exchange Act and reports of holdings of our securities filed by our officers and directors under Section 16 of the Exchange Act as soon as reasonably practicable after filing such material electronically or otherwise furnishing it to the SEC.  Copies of our Code of Business Conduct and Ethics, Corporate Governance Guidelines, Certificate of Incorporation, bylaws and the written charters of our Audit Committee, Executive Compensation Committee, Corporate Governance Committee and Executive Committee are also available on our website, and we will provide copies of these documents upon request.  Our website and any contents thereof are not incorporated by reference into this report.

We also make available on our website the Interactive Data Files required to be submitted and posted pursuant to Rule 405 of Regulation S-T.

ITEM 1A.    RISK FACTORS

Our investors should consider the following risks that could affect us and our business.  Although we have tried to discuss key factors, our investors need to be aware that other risks may prove to be important in the future.  New risks may emerge at any time, and we cannot predict such risks or estimate the extent to which they may affect our financial performance.  Investors should carefully consider the following discussion of risks and the other information included or incorporated by reference in this Annual Report, including “Forward-Looking Statements,” which are included in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

RISK FACTORS INHERENT IN OUR BUSINESS

Regulatory actions could impact our ability to earn a reasonable rate of return on our invested capital and to recover fully our operating costs.

In addition to regulation by other governmental authorities, we are subject to regulation by the OCC, KCC, RRC and various municipalities in Texas. These authorities set the rates that we charge our customers for our services. There can be no assurance that we will be able to obtain rate increases or that our authorized rates of return will continue at the current levels. We monitor and compare the rates of return we achieve with our allowed rates of return and initiate general and specific rate proceedings as needed. If a regulatory agency were to prohibit us from setting rates that allow for the timely recovery of our costs and a reasonable return by significantly lowering our allowed return or adversely altering our cost allocation, rate design or other tariff provisions, modifying or eliminating cost trackers, prohibiting recovery of regulatory assets or disallowing portions of our expenses, then our earnings could be impacted adversely. Regulatory proceedings also involve a risk of rate reduction, because once a proceeding has been filed, it is subject to challenge by various interveners.

Further, accounting principles that govern our company permit certain assets that result from the regulatory process to be recorded on our Balance Sheets that could not be recorded under GAAP for nonregulated entities. We consider factors such as rate orders from regulators, previous rate orders for substantially similar costs, written approval from the regulators and analysis of recoverability by internal and external legal counsel to determine the probability of future recovery of these assets. If we determine future recovery is no longer probable, we would be required to write off the regulatory assets at that time, which would also adversely affect our results of operations and cash flows. Regulatory authorities also review whether our natural gas costs are prudent and can adjust the amount of our natural gas costs that we pass through to our customers. If any of our natural gas costs were disallowed, our results of operations and cash flows would also be affected adversely.

In the normal course of business in the regulatory environment, assets are placed in service before regulatory action is taken, such as filing a rate case or for interim recovery under a capital tracking mechanism that could result in an adjustment of our returns. Once we make a regulatory filing, regulatory bodies have the authority to suspend implementation of the new rates while studying the filing. Because of this process, we may suffer the negative financial effects of having placed in service assets that do not initially earn our authorized rate of return or may not be allowed recovery on such expenditures at all.

The profitability of our operations is dependent on our ability to recover timely the costs related to providing natural gas service to our customers. However, we are unable to predict the impact that new regulatory requirements will have on our operating expenses or the level of capital expenditures and we cannot assure you that our regulators will continue to allow recovery of such expenditures in the future. Changes in the regulatory environment applicable to our business could impair our ability to recover costs absorbed historically by our customers, and impact adversely our results of operations, financial condition and cash flows.

We are subject to comprehensive energy regulation by governmental agencies, and the recovery of our costs is dependent on regulatory action.

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We are subject to comprehensive regulation by several state and municipal utility regulatory agencies, which significantly influences our operating environment and our ability to recover our costs from utility customers. The utility regulatory authorities in Oklahoma, Kansas and Texas regulate many aspects of our utility operations, including organization, safety, financing, affiliate transactions, customer service and the terms of service to customers, including the rates that we can charge customers. The profitability of our operations is dependent on our ability to pass through costs related to providing natural gas to our customers by filing periodic rate cases. The regulatory environment applicable to our operations could impair our ability to recover costs historically absorbed by our customers.

We are unable to predict the impact that the future regulatory activities of these agencies will have on our operations. Changes in regulations or the imposition of additional regulations could have an adverse impact on our business, financial condition and results of operations. Further, the results of our operations could be impacted adversely if our authorized cost-recovery mechanisms do not function as anticipated.

We are involved in legal or administrative proceedings before various courts and governmental bodies that could adversely affect our financial condition, results of operations and cash flows.

In the normal course of business, we are involved in legal or administrative proceedings before various courts and governmental bodies with respect to general claims, rates, environmental issues, gas cost prudence reviews and other matters. Adverse decisions regarding these matters, to the extent they require us to make payments in excess of amounts provided for in our financial statements, or to the extent they are not covered by insurance, could adversely affect our financial condition, results of operations and cash flows.

Unfavorable economic and market conditions could adversely affect our earnings.

Weakening economic activity in our markets could result in a loss of existing customers, fewer new customers, especially in newly constructed homes and other buildings, or a decline in energy consumption, any of which could adversely affect our revenues or restrict our future growth. It may become more difficult for customers to pay their natural gas bills, leading to slow collections and higher-than-normal levels of accounts receivable, which in turn could increase our financing requirements and bad debt expense. The foregoing could adversely affect our business, financial condition, results of operations and cash flows.

Increases in the wholesale price of natural gas could reduce our earnings, increase our working capital requirements and impact adversely our customer base.

The supply and demand balance in natural gas markets could cause an increase in the price of natural gas. Recently, the increased production in the U.S. of natural gas from shale formations has put downward pressure on the wholesale cost of natural gas; however, restrictions or regulations on shale natural gas production, increased demand from natural gas fueled electric power generation or natural gas exports could cause natural gas prices to increase. Additionally, the CFTC under the 2010 Dodd-Frank Wall Street Reform and Consumer Protection Act has regulatory authority of the over-the-counter derivatives markets. Regulations affecting derivatives could increase the price of our natural gas supply.

An increase in the price of natural gas could cause us to experience a significant increase in short-term debt because we must pay suppliers for natural gas when purchased, and can be significantly in advance of when such costs may be recovered through the collection of customer bills, which could adversely affect our financial condition and cash flows.

Further, the volatility of natural gas prices may impact adversely our customers’ perception of natural gas. Natural gas costs are passed through to the customers of our LDCs based on the actual cost of the natural gas purchased by the particular LDC. Substantial fluctuations in natural gas prices can occur from year to year and sustained periods of high natural gas prices or of pronounced natural gas price volatility may lead to customers selecting other energy alternatives, such as electricity, and to increased scrutiny of the prudency of our natural gas procurement strategies and practices by our regulators. It may also cause new home developers, builders and new customers to select alternative sources of energy. Additionally, high natural gas prices may cause customers to conserve more and may also impact adversely our accounts receivable collections, resulting in higher bad debt expense. The occurrence of any of the foregoing could adversely affect our business, financial condition, results of operations and cash flows, as well as our future growth opportunities.

In addition, customer demand for natural gas may decrease due to technological advancements that increase the efficiency of and decrease energy consumption of appliances and equipment powered by natural gas.

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Our risk-management policies and procedures may not be effective, and employees may violate our risk-management policies.

We have implemented a set of policies and procedures that involve both our senior management and the Audit Committee of our Board of Directors to assist us in managing risks associated with our business. These risk-management policies and procedures are intended to align strategies, processes, people, information technology and business knowledge so that risk is managed throughout the organization. However, as conditions change and become more complex, current risk measures may fail to assess adequately the relevant risk due to changes in the market and the presence of risks previously unknown to us. Additionally, if employees fail to adhere to our policies and procedures or if our policies and procedures are not effective, potentially because of future conditions or risks outside of our control, we may be exposed to greater risk than we had intended. Ineffective risk-management policies and procedures or violation of risk-management policies and procedures could have an adverse effect on our earnings, financial condition and cash flows.

Our business is subject to competition that could adversely affect our results of operations.

The natural gas distribution business is competitive, and we face competition from other companies that supply energy, including electric companies, propane dealers, renewable energy providers and coal companies in relation to sources of energy for electric power plants, as well as nuclear energy. Significant competitive factors include efficiency, quality and reliability of the services we provide and price.

The most significant product competition occurs between natural gas and electricity in the residential and small commercial markets. Natural gas competes with electricity for water and space heating, cooking, clothes drying and other general energy needs. Increases in the price of natural gas or decreases in the price of other energy sources could impact adversely our competitive position by decreasing the price benefits of natural gas to the consumer. Customers and builders typically make the decision on the type of equipment at initial installation and use the chosen energy source for the life of the equipment. Changes in the competitive position of natural gas relative to electricity and other energy products have the potential to cause a decline in consumption or in the number of natural gas customers.

Consumer or government-mandated conservation efforts, higher natural gas costs or decreases in the price of other energy sources also may encourage decreases in natural gas consumption and allow competition from alternative energy sources for applications that have traditionally used natural gas, encouraging some customers to move away from natural gas-fired equipment to equipment fueled by other energy sources. Competition between natural gas and other forms of energy is also based on efficiency, performance, reliability, safety and other nonprice factors. Technological improvements in other energy sources and events that impair the public perception of the nonprice attributes of natural gas could erode our competitive advantage. These factors in turn could decrease the demand for natural gas, impair our ability to attract new customers, and cause existing customers to switch to other forms of energy or to bypass our systems in favor of alternative competitive sources. This could result in slow or no customer growth and could cause customers to reduce or cease using our product, thereby reducing our ability to make capital expenditures and otherwise grow our business and affecting adversely our financial condition, results of operations and cash flows.

Our business activities are concentrated in three states.

We provide natural gas distribution services to customers in Oklahoma, Kansas and Texas. Changes in the regional economies, politics, regulations and weather patterns of these states could impact adversely the growth opportunities available to us and the usage patterns and financial condition of our customers. This could adversely affect our financial condition, results of operations and cash flows.

The availability of adequate natural gas pipeline transportation and storage capacity and natural gas supply may decrease and impair our ability to meet customers’ natural gas requirements and reduce our earnings.

In order to meet customers’ natural gas demands, we must obtain sufficient natural gas supplies, pipeline transportation and storage capacity from third parties. If we are unable to obtain these, our ability to meet our customers’ natural gas requirements could be impaired and our financial condition and results of operations may be impacted adversely. A significant disruption to or reduction in natural gas supply, pipeline capacity or storage capacity due to events including, but not limited to, operational failures or disruptions, hurricanes, tornadoes, floods, freeze off of natural gas wells, terrorist or cyber-attacks or other acts of war, or legislative or regulatory actions, could reduce our normal supply of natural gas and thereby reduce our earnings.

A downgrade in our credit ratings could adversely affect our cost of and ability to access capital.

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Our ability to obtain adequate and cost-effective financing depends in part on our credit ratings. A reduction in our ratings by our rating agencies could adversely affect our costs of borrowing and/or access to sources of liquidity and capital. Such a downgrade could further limit our access to public and private credit markets and increase the costs of borrowing under available credit lines. Should our credit ratings be downgraded, it could limit our ability to obtain additional financing in the future for working capital, capital expenditures and acquisitions. An increase in borrowing costs without the ability to recover these higher costs in the rates charged to our customers could adversely affect our results of operations and cash flows by limiting our ability to earn our allowed rate of return.

We are subject to new and existing laws and regulations that may require significant expenditures or significant increases in operating costs or result in significant fines or penalties for noncompliance.

Our business and operations are subject to regulation by a number of federal agencies, including FERC, DOT, OSHA, EPA, CFTC and various regulatory agencies in Oklahoma, Kansas and Texas, and we are subject to numerous federal and state laws and regulations. Future changes to laws, regulations and policies may impair our ability to compete for business or to recover costs and may increase the cost of our operations. Furthermore, because the language in some laws and regulations is not prescriptive, there is a risk that our interpretation of these laws and regulations may not be consistent with expectations of regulators. Any compliance failure related to these laws and regulations may result in fines, penalties or injunctive measures affecting our operating assets. For example, under the Energy Policy Act of 2005, the FERC has civil penalty authority under the Natural Gas Act of 1938, as amended, to impose penalties for current violations of up to $1 million per day for each violation. In addition, as the regulatory environment for our industry increases in complexity, the risk of inadvertent noncompliance could also increase. Our failure to comply with applicable regulations could result in a material adverse effect on our business, financial condition, results of operations and cash flows.

We are subject to strict regulations at many of our facilities regarding employee safety, and failure to comply with these regulations could adversely affect our financial results.

The workplaces associated with our facilities are subject to the requirements of DOT and OSHA, and comparable state statutes that regulate the protection of the health and safety of workers. The failure to comply with DOT, OSHA and state requirements or general industry standards, including keeping adequate records or preventing occupational exposure to regulated substances, could expose us to civil or criminal liability, enforcement actions, and regulatory fines and penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We are subject to environmental regulations, which could adversely affect our operations or financial results.

We are subject to laws, regulations and other legal requirements enacted or adopted by federal, state and local governmental authorities relating to environmental and health and safety matters, including those legal requirements that govern discharges of substances into the air and water, the management and disposal of hazardous substances and waste, the clean-up of contaminated sites, groundwater quality and availability, plant and wildlife protection, as well as work practices related to employee health and safety. Environmental legislation also requires that our facilities, sites and other properties associated with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable regulatory authorities. The failure to comply with these laws, regulations and other requirements, or the discovery of presently unknown environmental conditions, could expose us to civil or criminal liability, enforcement actions and regulatory fines and penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We also own or retain liability for certain environmental conditions at 12 former manufactured natural gas sites in Kansas, and expenses related to these sites could adversely affect our business, results of operations and cash flows. A number of environmental issues may exist with respect to manufactured gas plants.  With the trend toward stricter standards, greater regulation and more extensive permit requirements for the types of assets operated by us that are subject to environmental regulation, our environmental expenditures could increase in the future, and such expenditures may not be fully covered by insurance or recoverable in rates from our customers, which could adversely affect our financial condition, results of operations and cash flows.

We are subject to pipeline safety and system integrity laws and regulations that may require significant expenditures, significant increases in operating costs or, in the case of noncompliance, substantial fines.

We are subject to the Pipeline Safety Improvement Act, which requires companies like us that operate high-pressure pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas. Further, the Pipeline Safety, Regulatory Certainty and Job Creation Act increased the maximum penalties for violating federal pipeline safety regulations and directed the DOT and Secretary of Transportation to conduct

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further review or studies on issues that may or may not be material to us. Compliance with existing or new laws and regulations may result in increased capital, operating and other costs which may not be recoverable in rates from our customers or may impact materially our competitive position relative to other energy providers. Failure to comply with such laws and regulations may result in fines, penalties or injunctive measures that would not be recoverable from customers in rates and could result in a material adverse effect on our financial condition, results of operations and cash flows. The failure to comply with these laws, regulations and other requirements could expose us to civil or criminal liability, enforcement actions, and regulatory fines and penalties and could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Climate change, carbon neutral or energy-efficiency legislation or regulations could increase our operating costs or restrict our market opportunities, affecting adversely our growth, cash flows and results of operations.

The federal and/or state governments may enact legislation or regulations that attempt to control or limit the causes of climate change, including greenhouse gas emissions, such as carbon dioxide. Such laws or regulations could impose costs tied to carbon emissions, operational requirements or restrictions, or additional charges to fund energy efficiency activities. They could also provide a cost advantage to alternative energy sources, impose costs or restrictions on end users of natural gas, or result in other costs or requirements, such as costs associated with the adoption of new infrastructure and technology to respond to new mandates. The focus on climate change could impact adversely the reputation of fossil fuel products or services. The occurrence of the foregoing events could put upward pressure on the cost of natural gas relative to other energy sources, increase our costs and the prices we charge to customers, reduce the demand for natural gas or cause fuel switching to other energy sources, and impact the competitive position of natural gas and the ability to serve new or existing customers, affecting adversely our business, results of operations and cash flows.

We are subject to physical and financial risks associated with climate change.

There is a growing belief that emissions of greenhouse gases may be linked to global climate change. Climate change creates physical and financial risk. Our customers’ energy needs vary with weather conditions, primarily temperature and humidity. For residential customers, heating and cooling represent their largest energy use. To the extent weather conditions may be affected by climate change, customers’ energy use could increase or decrease depending on the duration and magnitude of any changes. A decrease in energy use due to weather changes may affect our financial condition through decreased revenues and cash flows. Extreme weather conditions in general require more system backup, adding to costs, and can contribute to increased system stresses, including service interruptions. Weather conditions outside of our operating territory could also have an impact on our revenues and cash flows by affecting natural gas prices. Severe weather impacts our operating territories primarily through thunderstorms, tornados and snow or ice storms. To the extent the frequency of extreme weather events increases, this could increase our cost of providing service. We may not be able to pass on the higher costs to our customers or recover all the costs related to mitigating these physical risks. To the extent financial markets view climate change and emissions of greenhouse gases as a financial risk, this could adversely affect our ability to access capital markets or cause us to receive less favorable terms and conditions in future financings. Our business could be affected by the potential for lawsuits related to or against greenhouse gas emitters based on the claimed connection between greenhouse gas emissions and climate change, which could impact adversely our business, results of operations and cash flows.

Demand for natural gas is highly weather sensitive and seasonal, and weather conditions may cause our earnings to vary from year to year.

Our earnings can vary from year to year, depending in part on weather conditions, which directly influence the volume of natural gas delivered to customers. Natural gas sales to residential and commercial customers are seasonal, as a substantial portion of their natural gas requirements are for heating during the winter months. Warmer-than-normal weather can reduce our utility margins as customer consumption declines. We have implemented weather normalization mechanisms for our sales to customers in Oklahoma, Kansas and portions of Texas, which are designed to limit our earnings sensitivity to weather. Weather normalization mechanisms allow us to increase customer billings to offset lower natural gas usage when weather is warmer than normal and decrease customer billings to offset higher natural gas usage when weather is colder than normal. If our rates and tariffs are modified to curtail such weather protection programs, then we would be exposed to additional risk associated with weather. As a result of occurrences of the foregoing, our results of operations and cash flows could vary and be impacted adversely.

We may not be able to complete necessary or desirable expansion or infrastructure development projects, which may delay or prevent us from serving our customers or expanding our business.

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In order to serve new customers or expand our service to existing customers, we may need to maintain, expand or upgrade our distribution and/or transmission infrastructure, including laying new distribution lines. Various factors may prevent or delay us from completing such projects or make completion more costly, such as the inability to obtain required approval from local, state and/or federal regulatory and governmental bodies, public opposition to the project, inability to obtain adequate financing, competition for labor and materials, construction delays, cost overruns, and inability to negotiate acceptable agreements relating to construction or other material components of an infrastructure development project. As a result, we may not be able to serve adequately existing customers or support customer growth, which would impact adversely our business, stakeholder perception, financial condition, results of operations and cash flows.

We may pursue acquisitions, divestitures and other strategic opportunities, the success of which may impact adversely our results of operations, cash flows and financial condition.

As part of our strategic objectives, we may pursue acquisitions to complement or expand our business, as well as divestures and other strategic opportunities. We may not be able to successfully negotiate, finance or receive regulatory approval for future acquisitions or integrate the acquired businesses with our existing business and services. These efforts may also distract our management and employees from day-to-day operations and require substantial commitments of time and resources. Future acquisitions could result in potentially dilutive issuances of equity securities, a decrease in our liquidity as a result of our using a significant portion of our available cash or borrowing capacity to finance the acquisition, the incurrence of debt, contingent liabilities and amortization expenses and substantial goodwill. The effects of these strategic decisions may have long-term implications that are not likely to be known to us in the short-term. Changing political climates and public attitudes may adversely affect the ongoing acceptability of strategic decisions that have been made (and, in some cases, previously approved by regulators) to the detriment of the company. We may be affected materially and adversely if we are unable to integrate successfully businesses that we acquire.

An impairment of goodwill and long-lived assets could reduce our earnings.

At December 31, 2015, we had approximately $158 million of goodwill recorded on our balance sheet. Goodwill is recorded when the purchase price of a business exceeds the fair market value of the tangible and separately measurable intangible net assets. GAAP requires us to test goodwill for impairment on an annual basis or when events or circumstances occur indicating that goodwill might be impaired. Long-lived assets with finite useful lives are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If we determine that impairment is indicated, we would be required to take an immediate noncash charge to earnings with a correlative effect on our equity and balance sheet leverage as measured by debt to total capitalization, which could impact adversely our financial condition and results of operations.

We may be unable to access capital or our cost of capital may increase significantly.

Our ability to obtain adequate and cost-effective financing is dependent upon the liquidity of the financial markets, in addition to our financial condition and credit ratings. Disruptions in the capital and credit markets could adversely affect our ability to access short-term and long-term capital. Access to funds under our ONE Gas Credit Agreement will be dependent on the ability of the participating banks to meet their funding commitments. Those banks may not be able to meet their funding commitments if they experience shortages of capital and liquidity. Disruptions and volatility in the global credit markets could cause the interest rate we pay on our ONE Gas Credit Agreement, which is based on LIBOR, to increase. This could result in higher interest rates on future financings, and could impact the liquidity of the lenders under our ONE Gas Credit Agreement, potentially impairing their ability to meet their funding commitments to us. Disruptions in the capital and credit markets as a result of uncertainty, changing or increased regulation or failures of significant financial institutions could adversely affect our access to capital needed for our business. The inability to access adequate capital or an increase in the cost of capital may require us to conserve cash, prevent or delay us from making capital expenditures, and require us to reduce or eliminate our dividend or other discretionary uses of cash. A significant reduction in our liquidity could cause a negative change in our ratings outlook or even a reduction in our credit ratings. This could in turn further limit our access to credit markets and increase our costs of borrowing.

Changes in federal and state fiscal, tax and monetary policy could increase significantly our costs or decrease our cash flows.

Changes in federal and state fiscal, tax and monetary policy may result in increased taxes, interest rates, and inflationary pressures on the costs of goods, services and labor. This could increase our expenses and capital spending and decrease our cash flows if we are not able to recover or recover timely such increased costs from our customers. This series of events may increase our rates to customers and thus may impact adversely customer billings and customer growth. Changes in tax rules

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could adversely affect our cash flows. Any of these events may cause us to increase debt, conserve cash, adversely affect our ability to make capital expenditures to grow the business or other discretionary uses of cash, and could adversely affect our cash flows.

Federal, state and local jurisdictions may challenge our tax return positions.

The preparation of our federal and state tax return filings may require significant judgments, use of estimates and the interpretation and application of complex tax laws. Significant judgment also is required in assessing the timing and amounts of deductible and taxable items. Despite management’s expectation that our tax return positions will be fully supportable, certain positions may be challenged successfully by federal, state and local jurisdictions.

As a result of cross-default provisions in our borrowing arrangements, we may be unable to satisfy all of our outstanding obligations in the event of a default on our part.

The terms of our debt agreements contain cross-default provisions, which provide that we will be in default under such agreements in the event of certain defaults under other debt agreements. Accordingly, should an event of default occur under any of those agreements, we would face the prospect of being in default under all of our debt agreements, obliged in such instance to satisfy all of our outstanding indebtedness simultaneously. In such an event, we may not be able to obtain alternative financing or, if we are able to obtain such financing, we may not be able to obtain it on terms acceptable to us, which would adversely affect our ability to implement our business plan, have flexibility in planning for, or reacting to, changes in our business, make capital expenditures and finance our operations.

The cost of providing pension and other postemployment health care benefits to eligible employees and qualified retirees is subject to changes in pension fund values and changing demographics and may increase. In addition, the passage of the Patient Protection and Affordable Care Act in 2010 could increase the cost of health care benefits for our employees. Further, the costs to us of providing such benefits and related funding requirements are subject to the continued and timely recovery of such costs through our rates.

We have defined benefit pension plans and other postemployment welfare plans for certain employees. Our defined benefit and other postemployment welfare plans are closed to new participants. Our other postemployment welfare plans only subsidize costs for providing postemployment medical benefits. The cost of providing these benefits to eligible current and former employees is subject to changes in the market value of our pension and other postemployment benefit plan assets, changing demographics, including longer life expectancy of plan participants and their beneficiaries, and changes in health care costs.

Any sustained declines in equity markets and reductions in bond values may have a material adverse effect on the value of our pension and other postemployment benefit plan assets. In these circumstances, additional cash contributions to our pension and other postemployment benefit plans may be required, which could have a material adverse impact on our financial condition and cash flows.

In addition, the costs of providing health care benefits to our employees could increase over the next five to ten years due in large part to the Patient Protection and Affordable Care Act of 2010. The future costs of compliance with its provisions are difficult to measure at this time. Also, our costs of providing such benefits and related funding requirements could also increase materially in the future, depending on the timing of the recovery, if any, of such costs through our rates, which could impact adversely our financial condition and cash flows.

Our business is subject to operational hazards and unforeseen interruptions that could affect materially and adversely our business and for which we may not be insured adequately.

We are subject to all of the risks and hazards typically associated with the natural gas distribution business. Operating risks include, but are not limited to, leaks, pipeline ruptures and the breakdown or failure of equipment or processes. Other operational hazards and unforeseen interruptions include adverse weather conditions, accidents, explosions, fires, the collision of equipment with our pipeline facilities (for example, this may occur if a third-party were to perform excavation or construction work near our facilities) and catastrophic events, such as tornados, hurricanes, earthquakes, floods or other similar events beyond our control. It is also possible that our facilities could be direct targets or indirect casualties of an act of terrorism, including cyber attacks. A casualty occurrence might result in injury or loss of life, extensive property damage or environmental damage caused to or by employees, customers, contractors, vendors and other third parties. The location of pipeline facilities near populated areas, including residential areas, commercial business centers and industrial gathering places, could increase the level of damages resulting from these risks. Liabilities incurred and interruptions to the operations of our pipelines or other facilities caused by such an event could reduce revenues generated by us and increase expenses, which could

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have a material adverse effect on our financial condition, results of operations and cash flows. Additionally, our regulators may not allow us to recover part or all of the increased cost related to the foregoing events from our customers, which would adversely affect our earnings and cash flows.

Unanticipated events or a combination of events, failure in resources needed to respond to events, or slow or inadequate response to events may have an adverse impact on our financial condition, results of operations and cash flows.

While we have general liability and property insurance currently in place in amounts that we consider appropriate based on our assessment of business risk and best practices in our industry and in general business, such policies are subject to certain limits and deductibles. Further, we are not fully insured against all risks inherent in our business. As a result of market conditions, premiums and deductibles for certain insurance policies can increase substantially, and, in some instances, certain insurance may become unavailable or available only for reduced amounts of coverage. Consequently, we may not be able to renew existing insurance policies or purchase other desirable insurance on commercially reasonable terms, if at all.

The insurance proceeds received for any loss of, or any damage to, any of our facilities or to third parties may not be sufficient to restore the total loss or damage. Further, the proceeds of any such insurance may not be paid in a timely manner. The occurrence of any of the foregoing could have a material adverse effect on our financial condition, results of operations and cash flows.

A failure in our operational systems or cyber security attacks on any of our facilities, or those of third parties, may adversely affect our financial results.

Our business is dependent upon our operational systems to process a large amount of data and complex transactions. If any of our financial, operational or other data processing systems fail or have other significant shortcomings, our financial results could be affected adversely. Our financial results could also be affected adversely if an employee causes our operational systems to fail, either as a result of inadvertent error or by deliberately tampering with or manipulating our operational systems. In addition, dependence upon automated systems may further increase the risk that operational system flaws, employee tampering or manipulation of those systems will result in losses that are difficult to detect.

Due to increased technology advances, we have become more reliant on technology to help increase efficiency in our business. We use computer programs to help run our financial and operations organizations, including an enterprise resource planning system that integrates data and reporting activities across our company. The use of technological programs, systems and tools may subject our business to increased risks. Any future cyber security attacks that affect our distribution facilities, our customers, our suppliers and third party service providers or any financial data could have a material adverse effect on our businesses. In addition, cyber attacks on our company, customer and employee data may result in a financial loss and may impact adversely our reputation. Third-party systems on which we rely could also suffer operational system failure.

The foregoing events could adversely affect our business reputation, diminish customer confidence, disrupt operations, subject us to financial liability or increased regulation, increase our costs and expose us to material legal claims and liability, and our business, financial condition and results of operations could be affected adversely.

Our business could be affected adversely by strikes or work stoppages by our unionized employees.

At February 1, 2016, approximately 700 of our estimated 3,400 employees were represented by collective-bargaining units under collective-bargaining agreements. We are involved periodically in discussions with collective-bargaining units representing some of our employees to negotiate or renegotiate labor agreements. We cannot predict the results of these negotiations, including whether any failure to reach new agreements will have a negative effect on our business, financial condition and results of operations or whether we will be able to reach any agreement with the collective-bargaining units. Any failure to reach agreement on new labor contracts might result in a work stoppage. Any future work stoppage could, depending on the operations and the length of the work stoppage, have a material adverse effect on our financial condition and results of operations.

A shortage of skilled labor may make it difficult for us to maintain labor productivity and competitive costs, which could adversely affect operations and cash flows. Further, we may be unable to attract and retain professional and technical employees, which could impact adversely our earnings.

Our operations require skilled and experienced workers with proficiency in multiple tasks. In recent years, a shortage of workers trained in various skills associated with the natural gas distribution business has caused us to conduct certain operations without full staff, thus hiring outside resources, which may decrease productivity and increase costs. This shortage

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of trained workers is the result of experienced workers reaching retirement age and increased competition for workers in certain areas, combined with the difficulty of attracting new workers to the natural gas distribution industry. This shortage of skilled labor could continue over an extended period. If the shortage of experienced labor continues or worsens, it could have an adverse impact on labor productivity and costs and our ability to meet the needs of our customers in the event there is an increase in the demand for our products and services, which could adversely affect our business and cash flows.

Our ability to implement our business strategy and serve our customers is dependent upon our ability to employ talented professionals and attract and retain a skilled, high-performing workforce. We are subject to the risk that we will not be able to effectively replace or transfer the knowledge and expertise of retiring employees. Without a skilled workforce, our ability to provide quality service to our customers and meet our regulatory requirements will be challenged, and this could impact adversely our business, financial condition, results of operations and cash flows.

Changes in accounting standards may impact adversely our financial condition and results of operations.

The SEC is considering whether issuers in the United States should be required to prepare financial statements in accordance with IFRS instead of the current GAAP. IFRS is a comprehensive set of accounting standards promulgated by the International Accounting Standards Board, which are currently in effect for most other countries in the world. Unlike GAAP, IFRS does not provide currently an industry accounting standard for rate-regulated activities. As such, if IFRS were adopted in its current state, we may be precluded from applying certain regulatory accounting principles, including the recognition of certain regulatory assets and regulatory liabilities. The potential issues associated with rate-regulated accounting, along with other potential changes associated with the adoption of IFRS, may impact adversely our reported financial condition and results of operations should adoption of IFRS be required.

Additionally, we are subject to additional changes in GAAP, SEC regulations and other interpretations of financial reporting requirements for public utilities. We neither have control over the impact these changes may have on our financial condition or results of operations nor the timing of such changes.

Our financing arrangements subject us to various restrictions that could limit our operating flexibility.

The covenants in the indenture governing our Senior Notes and our ONE Gas Credit Agreement restrict our ability to create or permit certain liens, to consolidate or merge or to convey, transfer or lease substantially all of our properties and assets.

The ONE Gas Credit Agreement includes a requirement that our debt to total capital ratio may not exceed 70 percent as of the end of any calendar quarter. Events beyond our control could impair our ability to satisfy this requirement. As long as our indebtedness remains outstanding, these restrictive covenants could impair our ability to expand or pursue our growth strategy. In addition, the breach of any covenants or any payment obligations in any of these debt agreements will result in an event of default under the applicable debt instrument. If there were an event of default under one of our debt agreements, the holders of the defaulted debt may have the ability to cause all amounts outstanding with respect to that debt to be due and payable, subject to applicable grace periods. This could trigger cross-defaults under our other debt agreements, including our Senior Notes. Forced repayment of some or all of our indebtedness would reduce our available cash and have an adverse impact on our financial condition and results of operations.

Some of our debt, including borrowings under our ONE Gas Credit Agreement and our commercial paper program, is based on variable rates of interest, which could result in higher interest expenses in the event of an increase in interest rates.

In the future, we could be exposed to fluctuations in variable interest rates. This increases our exposure to fluctuations in market interest rates. Amounts borrowed under the ONE Gas Credit Agreement and commercial paper program are based on variable rates of interest. If these rates rise, the interest rate on this debt will also increase. Therefore, an increase in these rates may increase our interest payment obligations and have a negative effect on our cash flows and financial position.

RISKS RELATING TO THE SEPARATION

We are responsible for certain contingent and other liabilities related to the historical natural gas distribution business of ONEOK, as well as a portion of any contingent corporate liabilities of ONEOK that do not relate to either the natural gas distribution business or ONEOK’s remaining businesses.

Under the Separation and Distribution Agreement between us and ONEOK , we assumed and are responsible for certain contingent and other corporate liabilities related to the historical natural gas distribution business of ONEOK (including

21

associated costs and expenses, whether arising prior to, at, or after our separation). In addition, under the Separation and Distribution Agreement we are also responsible for a portion of any contingent corporate liabilities of ONEOK that do not relate to either our business or the business of ONEOK following the separation (for example, liabilities associated with certain corporate activities not specifically attributable to either business). If we are required to indemnify ONEOK or are otherwise liable for these liabilities, they may have a material adverse effect on our financial condition, results of operations and cash flows.

Third parties may seek to hold us responsible for liabilities of ONEOK that we did not assume in our agreements.
 
Third parties may seek to hold us responsible for retained liabilities of ONEOK. Under our agreements with ONEOK, ONEOK has agreed to indemnify us for claims and losses relating to these retained liabilities. However, if those liabilities are significant and we are ultimately held liable for them, we cannot assure that we will be able to recover the full amount of our losses from ONEOK.

Our prior and continuing relationship with ONEOK exposes us to risks attributable to businesses of ONEOK.

ONEOK is obligated to indemnify us for losses that a party may seek to impose upon us or our affiliates for liabilities relating to the business of ONEOK. Any claims made against us that are properly attributable to ONEOK in accordance with these arrangements require us to exercise our rights under our agreements with ONEOK to obtain payment from ONEOK. We are exposed to the risk that, in these circumstances, ONEOK cannot, or will not, make the required payment.

If the distribution, together with certain related transactions, were to fail to qualify as a tax-free transaction for U.S. federal income tax purposes under Sections 355, 368(a)(1)(D) and other related provisions of the Code, then ONEOK and/or its shareholders could incur significant U.S. federal income tax liabilities, and we could incur significant indemnity obligations.

ONEOK received an IRS Ruling to the effect that the distribution, together with certain related transactions, qualified as tax-free to ONEOK, us and the ONEOK shareholders under Sections 355, 368(a)(1)(D) and other related provisions of the Code. ONEOK also received an opinion of Skadden, Arps, Slate, Meagher & Flom LLP, tax counsel to ONEOK, which opinion relies on the continued validity of the IRS Ruling, with respect to certain issues relating to the tax-free nature of the transactions that were not addressed in or covered by the IRS Ruling.

The IRS Ruling and the tax opinion rely upon certain assumptions, as well as statements, representations and certain undertakings made by our officers and the officers of ONEOK regarding the past and future conduct of the companies’ respective businesses and other matters. If any of those statements, representations or assumptions are incorrect or untrue in any material respect or any of those undertakings are not complied with, the conclusions reached in the IRS Ruling or the opinion could be affected adversely, and ONEOK and/or its shareholders could be subject to significant tax liabilities. Notwithstanding the IRS Ruling and opinion of tax counsel, the IRS could determine on audit that the distribution, together with certain related transactions, was taxable if it determines that any of these statements, representations, assumptions, or undertakings were not correct or have been violated or if it disagrees with the conclusions in the opinion that were not covered by the IRS Ruling, or for other reasons, including as a result of certain significant changes in the stock ownership of ONEOK or us after the distribution.
If the distribution were subsequently determined, for whatever reason, not to qualify as a transaction that is tax-free for U.S. federal income tax purposes under Sections 355, 368(a)(1)(D), and other related provisions of the Code, ONEOK and/or the holders of ONEOK common stock immediately prior to the distribution could incur significant tax liabilities, and, in certain circumstances as described further under "Certain Relationships and Related Transactions, and Director Independence - Tax Matters Agreement," we will be required to indemnify ONEOK, its subsidiaries, and certain related persons for taxes and related expenses resulting from the distribution, which could be material. Any such indemnity obligation could have a materially adverse impact on our financial condition.

To preserve the tax-free treatment to ONEOK and/or its shareholders of the distribution and certain related transactions, we may not be able to engage in certain transactions.

To preserve the tax-free treatment to ONEOK and/or its shareholders of the distribution and certain related transactions, we are restricted, under the Tax Matters Agreement between us and ONEOK, from taking any action that prevents such transactions from being tax-free for U.S. federal, state and local income tax purposes. These restrictions may limit our ability to pursue certain strategic transactions or engage in other transactions, including using our common stock to make acquisitions and in connection with equity capital market transactions that might increase the value of our business.

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RISKS RELATING TO OUR COMMON STOCK

Provisions in our certificate of incorporation, our bylaws, Oklahoma law and certain of the agreements into which we have entered as part of the separation may prevent or delay an acquisition of our company, which could decrease the trading price of our common stock.

Our certificate of incorporation, bylaws and Oklahoma law contain provisions that are intended to deter coercive takeover practices and inadequate takeover bids by making such practices or bids unacceptably expensive to the raider and to encourage prospective acquirers to negotiate with our board of directors rather than to attempt a hostile takeover. These provisions include, among others:

•	a board of directors that is divided into three classes with staggered terms;	
		
•	rules regarding how shareholders may present proposals or nominate directors for election at shareholder meetings;	
		
•	the right of our board of directors to issue preferred stock without shareholder approval; and	
		
•	limitations on the right of shareholders to remove directors.	

Oklahoma law also imposes some restrictions on mergers and other business combinations between us and any holder of 15 percent or more of our outstanding common stock.

We believe these provisions protect our shareholders from coercive or otherwise potentially unfair takeover tactics by requiring potential acquirers to negotiate with our board of directors and by providing our board of directors with more time to assess any acquisition proposal. These provisions are not intended to make our company immune from takeovers. However, these provisions apply even if the offer may be considered beneficial by some shareholders and could delay or prevent an acquisition that our board of directors determines is not in the best interests of our company and our shareholders.

Our ability to pay dividends on our common stock will depend on our ability to generate sufficient positive earnings and cash flows.

Our ability to pay dividends in the future will depend upon, among other things, our future earnings, cash flows and restrictive covenants, if any, under future credit agreements to which we may be a party. Our cash available for dividends will principally be generated from our operations. Because the cash we generate from operations will fluctuate from quarter to quarter, we may not be able to maintain future dividends at the levels we expect or at all. Our ability to pay dividends depends primarily on cash flows, including cash flows from changes in working capital, and not solely on profitability, which is affected by noncash items. As a result, we may pay dividends during periods when we record net losses and may be unable to pay cash dividends during periods when we record net income.

ITEM 1B.    UNRESOLVED STAFF COMMENTS

None.

ITEM 2.    PROPERTIES

The following table sets forth the approximate number of service lines, pipeline and other natural gas distribution properties as of December 31, 2015:

	
										
Properties (miles)	 	OK	KS	TX	Total	
Distribution	 	18,300		12,000		10,100		40,400		
Transmission	 	700		1,500		800		3,000		
Total properties	 	19,000		13,500		10,900		43,400		

We lease approximately 0.5 million square feet of office space and other facilities for our operations. In addition, we have 50.4 Bcf of natural gas storage capacity under lease, with maximum allowable daily withdrawal capacity of approximately 1.3 Bcf/d.

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ITEM 3.    LEGAL PROCEEDINGS

See Note 14 of the Notes to Financial Statements in this Annual Report for information regarding legal proceedings.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5.	MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	

MARKET INFORMATION, HOLDERS AND DIVIDENDS

Our common stock is listed on the NYSE under the trading symbol “OGS.”  The following table sets forth the high and low closing prices of our common stock for the period indicated:

	
											
 	 	Year Ended	
 	 	December 31, 2015	
 	 	High	Low	Dividends	
First Quarter	 	$	46.11		$	39.38		$	0.30		
Second Quarter	 	$	44.33		$	41.41		$	0.30		
Third Quarter	 	$	45.56		$	41.70		$	0.30		
Fourth Quarter	 	$	51.34		$	45.18		$	0.30		

											
 	 	Year Ended	
 	 	December 31, 2014*	
 	 	High	Low	Dividends	
First Quarter	 	$	35.80		$	31.53		$	—		
Second Quarter	 	$	37.98		$	34.25		$	0.28		
Third Quarter	 	$	37.77		$	34.00		$	0.28		
Fourth Quarter	 	$	44.19		$	34.03		$	0.28		
*Our common stock began regular-way trading on February 3, 2014.	

At February 5, 2016, there were 14,944 registered shareholders of the Company’s common stock.

In January 2016, we declared a dividend of $0.35 per share ($1.40 per share on an annualized basis), payable on March 11, 2016, to shareholders of record as of February 26, 2016.

Employee Stock Award Program

Under the Employee Stock Award Program, we have issued, for no monetary consideration, one share of our common stock to all eligible employees when the per-share closing price of our common stock on the NYSE closes for the first time at or above each $1.00 increment above $34. Shares issued to employees under this program during 2015 totaled 23,506, and compensation expense related to the Employee Stock Award Program was $1.1 million.

The total number of shares of our common stock authorized for issuance under this program is 125,000.  The shares issued under this program have not been registered under the Securities Act, in reliance upon the position taken by the SEC (see Release No. 6188, dated February 1, 1980) that the issuance of shares to employees pursuant to a program of this kind does not require registration under the Securities Act.  See Note 11 of the Notes to Financial Statements in this Annual Report for additional information.

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Performance Graph

The following performance graph compares the performance of our common stock with the S&P MidCap 400 Index, the Dow Jones Industrial Average and a ONE Gas Peer Group during the period beginning February 3, 2014, and ending on December 31, 2015. February 3, 2014 was the first day of “regular way” trading for ONE Gas on the NYSE. This graph assumes a $100 investment in our common stock and in each of the indices at the beginning of the period and a reinvestment of dividends paid on such investments throughout the period.

	
																									
 	Cumulative Total Return	
 	As of Each Quarter Ending	
 	3/31/2014	6/30/2014	9/30/2014	12/31/2014	3/31/2015	6/30/2015	9/30/2015	12/31/2015	
ONE Gas, Inc.	$	106.84		$	113.12		$	103.41		$	125.39		$	132.43		$	131.32		$	140.81		$	156.83		
S&P MidCap 400 Utilities Index	$	107.49		$	115.89		$	105.54		$	118.29		$	112.20		$	104.63		$	107.00		$	111.26		
S&P MidCap 400 Index	$	109.21		$	113.93		$	109.38		$	116.32		$	122.50		$	121.19		$	110.89		$	113.78		
Dow Jones Industrial Average	$	107.54		$	110.59		$	112.66		$	118.52		$	118.91		$	118.56		$	110.28		$	118.77		
ONE Gas Peer Group 1	$	107.04		$	116.31		$	107.44		$	127.05		$	123.53		$	114.69		$	126.30		$	137.63		
1  The ONE Gas peer group used in this graph is the same peer group that will be used in determining our level of performance under our 2015 performance units at the end of the three-year performance period and is comprised of the following companies: AGL Resources Inc.; Atmos Energy Corporation; Avista Corporation; The Laclede Group, Inc.; New Jersey Resources Corporation; Northwest Natural Gas Company; Piedmont Natural Gas Company, Inc.; Questar Corporation; South Jersey Industries, Inc.; Southwest Gas Corp.; Vectren Corporation and WGL Holdings, Inc.	

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ITEM 6.    SELECTED FINANCIAL DATA

The following table sets forth our selected financial data for each of the periods indicated:

																					
 	 	Years Ended December 31,	
 	 	2015	 	2014	 	2013	 	2012	 	2011	
 	 	( Millions of dollars except per share data )	
Revenues	 	$	1,547.7		 	$	1,818.9		 	$	1,690.0		 	$	1,376.6		 	$	1,621.3		
Net margin	 	$	841.7		 	$	827.0		 	$	813.0		 	$	756.4		 	$	751.8		
Operating income	 	$	239.1		 	$	225.3		 	$	220.3		 	$	215.7		 	$	199.7		
Net income	 	$	119.0		 	$	109.8		 	$	99.2		 	$	96.5		 	$	86.8		
Total assets	 	$	4,644.4		 	$	4,649.2		 	$	3,846.5		 	$	3,491.3		 	$	3,285.5		
Long-term line of credit with ONEOK	 	$	—		 	$	—		 	$	1,027.6		 	$	1,027.6		 	$	912.4		
Long-term debt, including current maturities	 	$	1,201.3		 	$	1,201.3		 	$	1.3		 	$	1.5		 	$	1.9		
Basic earnings per share	 	$	2.26		 	$	2.10		 	$	1.90		 	$	1.84		 	$	1.66		
Diluted earnings per share	 	$	2.24		 	$	2.07		 	$	1.90		 	$	1.84		 	$	1.66		
Dividends declared per common share	 	$	1.20		 	$	0.84		 	—		 	—		 	—		

Prior to 2014, historical basic and diluted earnings per share for the periods presented were calculated based on the number of shares distributed to ONEOK shareholders on separation plus any shares associated with fully vested stock awards that had not been issued and considered outstanding as of the beginning of each period prior to the separation. See Note 1 of the Notes to Financial Statements in this Annual Report for additional information on earnings per share.

ITEM 7.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	

The following discussion and analysis should be read in conjunction with our audited financial statements and Notes to Financial Statements in this Annual Report.

EXECUTIVE SUMMARY

We are a 100 percent regulated natural gas distribution company. As such, our regulators determine the rates we are allowed to charge for our service based on our revenue requirements needed to achieve our authorized rates of return. We earn revenues from the delivery of natural gas, but do not earn a profit on the natural gas that we deliver, as those costs are passed through to our customers at cost. The primary components of our revenue requirements are the amount of capital invested in our business, which is also known as rate base, our allowed rate of return on our capital investments and our recoverable operating expenses, including depreciation and income taxes. Our rates have both a fixed and a variable component, with approximately 73 percent and 71 percent of our natural gas sales net margin in 2015 and 2014, respectively, derived from fixed monthly charges to our customers. The variable component of our rates is dependent on the consumption of natural gas, which is impacted primarily by the weather and, to a lesser extent, economic activity. While we have weather normalization mechanisms in most jurisdictions that adjust customers’ bills when the actual heating degree days differ from normalized heating degree days, these mechanisms are in place for only a portion of the year and do not offset all fluctuations in usage resulting from weather variability. Accordingly, the weather can have either a positive or negative impact on our financial performance.

Our financial performance, therefore, is contingent on a number of factors, including: (1) regulatory outcomes, which determine the returns we are authorized to earn and the rates we are allowed to charge for our service; (2) the consumption of natural gas, which impacts the amount of our net margin derived from the variable component of our rates; (3) our operating performance, which impacts our operating expenses; and (4) the perceived value of natural gas relative to other energy sources, particularly electricity, which influences our customers’ choice of natural gas to provide a portion of their energy needs.

We are subject to regulatory requirements for pipeline integrity and environmental compliance. These requirements impact our operating expenses and the level of capital expenditures required for compliance. Historically, our regulators have allowed recovery of these expenditures. However, because integrity and environmental regulation is changing constantly, our capital and operating expenditures to comply will change, as well.  Although we believe our regulators will continue to allow recovery of such expenditures in the future, we will continue to make these expenditures with no assurance about if, or over what period, we will be permitted to recover them.

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RECENT DEVELOPMENTS

In January 2016, a dividend of $0.35 per share ($1.40 per share on an annualized basis) was declared for shareholders of record on February 26, 2016, payable March 11, 2016.

REGULATORY ACTIVITIES

Oklahoma - In July 2015, Oklahoma Natural Gas filed a request with the OCC for an increase in base rates, reflecting system investments and operating costs necessary to maintain the safety and reliability of its natural gas distribution system. In January 2016, the OCC approved a joint stipulation and settlement agreement reached in November 2015 to allow an increase in revenue of $29,995,000. We also recorded a regulatory asset of $2.4 million to recover certain information technology costs incurred as a result of our separation from ONEOK in 2014, which will be recovered over four years. The agreement set Oklahoma Natural Gas’ authorized return on equity at 9.5 percent, which represents the midpoint of the allowed range of 9.0 to 10.0 percent and a rate base of approximately $1.2 billion. The agreement includes the continuation, with certain modifications, of the Performance Based Rate Change tariff that was established in 2009.

In March 2015, Oklahoma Natural Gas filed its energy-efficiency program true-up application for its 2014 program year, requesting a utility incentive of $1.2 million. In July 2015, the Public Utility Division of the OCC and all other parties entered into a joint stipulation approving the filing. A hearing on merits was held in July 2015, with the Administrative Law Judge recommending the approval of the joint stipulation. The joint stipulation was approved by the OCC in December 2015.

Oklahoma Natural Gas filed a PBRC application in March 2014. In June 2014, a joint stipulation and settlement agreement associated with our PBRC filing was reached and contained an increase in base rates of approximately $13.7 million, and an energy-efficiency program true-up and a utility incentive adjustment of $0.9 million. In August 2014, the settlement was approved by the OCC.

Kansas - Kansas Gas Service is expected to file a rate case in 2016 based on a 2015 test year, with new rates effective January 2017.

In August 2015, Kansas Gas Service submitted an application to the KCC requesting an increase of approximately $2.4 million related to its GSRS. GSRS is a capital-recovery mechanism that allows for rate adjustment, providing recovery of and a return on incremental safety-related and government-mandated capital investments made between rate cases. In November 2015, the KCC approved the $2.4 million increase effective December 2015.
 
In August 2014, Kansas Gas Service submitted an application to the KCC requesting an increase in rates of approximately $3.5 million related to its GSRS. In November 2014, the KCC approved an increase of $3.5 million, which became effective on December 2014.

In December 2013, the KCC approved a settlement agreement between ONEOK, the staff of the KCC, and the Citizens’ Utility Ratepayer Board for the separation from ONEOK of our Kansas Gas Service natural gas distribution business. Among other things, the terms of the settlement agreement include the following:

•	Kansas Gas Service shall not change its base rates prior to January 1, 2017. The time limitation on filing a general rate case to change base rates does not preclude Kansas Gas Service from changing rates or tariffs to recover appropriate costs under its current approved riders and tariffs, including its COGR, ACA, WNA, ATSR and GSRS tariffs;	
		
•	Kansas Gas Service agreed to expense certain costs associated with ONEOK’s acquisition of Kansas Gas Service in 1997 that were previously recorded as a regulatory asset and were being amortized and recovered in rates over a 40-year period. As such, we recorded a noncash charge to income of approximately $10.2 million in the fourth quarter of 2013;	
		
•	The level of pension and other postemployment benefit costs used to calculate Kansas Gas Service’s Pension and Other Postemployment Benefit Trackers was adjusted to $13.6 million from $16.6 million, with a corresponding reduction to revenues; and	
		
•	A one-time contribution to 501(c)(3) organizations of $1.2 million to provide financial assistance for weatherization of housing for low income natural gas customers of Kansas Gas Service that was accrued in the fourth quarter of 2013.	

The agreement authorized the transfer of ONEOK’s existing Kansas natural gas distribution assets, certificates of convenience and necessity, franchises and tariffs to us.

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Texas - In December 2015, Texas Gas Service filed a rate case requesting an increase in revenues of $3.1 million for its Galveston and South Jefferson County service areas.  Texas Gas Service filed this rate case directly with the incorporated cities, and the RRC for the unincorporated areas. If approved by the cities and the RRC, the new rates will become effective in June 2016.

In March 2014, Texas Gas Service and the City of El Paso agreed to enter into an annual rate review mechanism called the EPARR. The EPARR provides for a streamlined review of Texas Gas Service’s revenue requirement on an annual basis, and is in lieu of a filing under the GRIP statute. Texas Gas Service continued to file under the GRIP statute for other incorporated cities in the EPSA until early 2015, when the other incorporated cities in the EPSA adopted the EPARR mechanism. GRIP is a capital-recovery mechanism that allows for a rate adjustment providing recovery of and a return on incremental capital investments made between rate cases.

In March 2015, Texas Gas Service filed under the EPARR, requesting an increase in revenues of $9.4 million in the City of El Paso and surrounding incorporated cities in the EPSA. The filing included a request to include a payroll adjustment which would increase revenues by an additional $1.8 million, for a total increase in revenues of $11.2 million.  In August 2015, Texas Gas Service and the incorporated cities in the EPSA reached an agreement on a rate increase of $8.0 million to take effect in August 2015. In April 2015, Texas Gas Service filed with the RRC under the GRIP statute, requesting an increase of $0.4 million in revenues for the unincorporated areas of the EPSA. The RRC approved the filing in July 2015. In November 2015, Texas Gas Service notified the EPSA that it would be filing a full rate case in lieu of the EPARR in 2016.

Texas Gas Service filed requests for interim rate relief under the GRIP statute with the City of Austin, Texas, and surrounding communities in February 2014 for approximately $5.2 million. The city councils approved the requested increase effective May 2014. Texas Gas Service received approval for rate relief under the GRIP statute with the City of Austin, Texas, and surrounding communities in May 2015, for approximately $3.7 million. The new rates became effective in June 2015.

Texas Gas Service filed requests for interim rate relief under the GRIP statute with the cities of Austin, Texas, and surrounding communities in February 2013 and with El Paso, Texas, in April 2013 for approximately $4.1 million and $4.9 million, respectively. In May 2013, the City of Austin approved the requested increase. In July 2013, the City of El Paso denied Texas Gas Service’s GRIP request, which Texas Gas Service appealed to the RRC. In September 2013, the RRC approved Texas Gas Service’s requested increase.

In the normal course of business, Texas Gas Service has filed rate cases and sought GRIP and cost-of-service adjustments in various other Texas jurisdictions to address investments in rate base and changes in expense. Annual rate increases totaling $4.8 million, $4.0 million and $4.2 million associated with these filings were approved in 2015, 2014 and 2013, respectively.

Texas Gas Service expects to file a rate case in the Central Texas jurisdiction, which includes the city of Austin, in 2016.

General - Certain costs to be recovered through the ratemaking process have been capitalized as regulatory assets. Should recovery cease due to regulatory actions, certain of these assets may no longer meet the criteria for recognition and accordingly, a writeoff of regulatory assets and stranded costs may be required. In 2013, as part of the KCC settlement for the separation of our Kansas Gas Service assets from ONEOK, we expensed $10.2 million for the remaining balance of certain costs associated with ONEOK’s acquisition of Kansas Gas Service in 1997. There were no writeoffs of regulatory assets resulting from the failure to meet the criteria for capitalization during 2015 and 2014.

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Selected Financial Results - The following table sets forth certain selected financial results for our operations for the periods indicated:

																											
 	 	 	 	 	 	Variances	 	Variances	
 	 	Years Ended December 31,	 	2015 vs. 2014	 	2014 vs. 2013	
Financial Results	 	2015	 	2014	 	2013	 	Increase (Decrease)	 	Increase (Decrease)	
 	 	( Millions of dollars, except percentages )	
Natural gas sales	 	$	1,417.9		 	$	1,680.1		 	$	1,558.5		 	$	(262.2	)	 	(16	)%	 	$	121.6		 	8	 %	
Transportation revenues	 	98.8		 	102.3		 	98.7		 	(3.5	)	 	(3	)%	 	3.6		 	4	 %	
Cost of natural gas	 	706.0		 	991.9		 	876.9		 	(285.9	)	 	(29	)%	 	115.0		 	13	 %	
Net margin, excluding other revenues	 	810.7		 	790.5		 	780.3		 	20.2		 	3	 %	 	10.2		 	1	 %	
Other revenues	 	31.0		 	36.5		 	32.7		 	(5.5	)	 	(15	)%	 	3.8		 	12	 %	
Net margin	 	841.7		 	827.0		 	813.0		 	14.7		 	2	 %	 	14.0		 	2	 %	
Operating costs	 	469.6		 	476.0		 	447.9		 	(6.4	)	 	(1	)%	 	28.1		 	6	 %	
Depreciation and amortization	 	133.0		 	125.7		 	144.8		 	7.3		 	6	 %	 	(19.1	)	 	(13	)%	
Operating income	 	$	239.1		 	$	225.3		 	$	220.3		 	$	13.8		 	6	 %	 	$	5.0		 	2	 %	
Capital expenditures	 	$	294.3		 	$	297.1		 	$	292.1		 	$	(2.8	)	 	(1	)%	 	$	5.0		 	2	 %	

The following table sets forth our net margin, excluding other revenues, by type of customer, for the periods indicated:

																											
 	 	 	 	 	 	Variances	 	Variances	
 	 	Years Ended December 31,	 	2015 vs. 2014	 	2014 vs. 2013	
Net Margin, Excluding Other Revenues	 	2015	 	2014	 	2013	 	Increase (Decrease)	 	Increase (Decrease)	
Natural gas sales	 	( Millions of dollars, except percentages )	
Residential	 	$	589.8		 	$	569.7		 	$	564.5		 	$	20.1		 	4	 %	 	$	5.2		 	1	%	
Commercial and industrial	 	115.6		 	112.9		 	111.5		 	2.7		 	2	 %	 	1.4		 	1	%	
Wholesale and public authority	 	6.5		 	5.6		 	5.6		 	0.9		 	16	 %	 	—		 	—	%	
Net margin on natural gas sales	 	711.9		 	688.2		 	681.6		 	23.7		 	3	 %	 	6.6		 	1	%	
Transportation revenues	 	98.8		 	102.3		 	98.7		 	(3.5	)	 	(3	)%	 	3.6		 	4	%	
Net margin, excluding other revenues	 	$	810.7		 	$	790.5		 	$	780.3		 	$	20.2		 	3	 %	 	$	10.2		 	1	%	

Our net margin on natural gas sales is comprised of two components, fixed and variable margin. Fixed margin reflects the portion of our net margin attributable to the monthly fixed customer charge component of our rates, which does not fluctuate based on customer usage in each period. Variable margin reflects the portion of our net margin that fluctuates with the volumes delivered and billed. We believe that the combination of the significant residential component of our customer base, the fixed charge component of our sales margin and our regulatory rate mechanisms in place result in a stable cash flow profile. The following table sets forth our net margin on natural gas sales by revenue type for the periods indicated:

																											
 	 	 	 	 	 	Variances	 	Variances	
 	 	Years Ended December 31,	 	2015 vs. 2014	 	2014 vs. 2013	
Net Margin on Natural Gas Sales	 	2015	 	2014	 	2013	 	Increase (Decrease)	 	Increase (Decrease)	
Net margin on natural gas sales	 	( Millions of dollars, except percentages )	
Fixed margin	 	$	519.2		 	$	490.4		 	$	470.6		 	$	28.8		 	6	 %	 	$	19.8		 	4	 %	
Variable margin	 	192.7		 	197.8		 	211.0		 	(5.1	)	 	(3	)%	 	(13.2	)	 	(6	)%	
Net margin on natural gas sales	 	$	711.9		 	$	688.2		 	$	681.6		 	$	23.7		 	3	 %	 	$	6.6		 	1	 %	

2015 vs. 2014 - Net margin increased $14.7 million due primarily to the following:

•	an increase of $27.5 million from new rates, primarily in Texas and Oklahoma; and	
		
•	an increase of $4.8 million in residential sales due primarily to customer growth in Oklahoma and Texas; offset partially by	
		
•	a decrease of $6.0 million due to lower line extension revenue, from commercial and industrial customers, and other revenues;	
		
•	a decrease of $4.8 million due to lower sales volumes, net of weather normalization, primarily due to warmer weather in 2015;	

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•	a decrease of $3.7 million in rider and surcharge recoveries due to a lower ad-valorem surcharge in Kansas and the expiration of the rider associated with the recovery of take-or-pay settlements in Oklahoma, both of which are offset by lower regulatory amortization in depreciation and amortization expense; and	
		
•	a decrease of $3.1 million due primarily to lower transportation volumes from weather-sensitive customers primarily in Kansas.	

Operating costs decreased $6.4 million due primarily to the following:

•	a decrease of $6.8 million in information technology services associated with our separation from ONEOK;	
		
•	a decrease of $6.0 million in outside services costs due primarily to operational efficiencies;	
		
•	a decrease of $4.1 million in legal and worker’s compensation expense;	
		
•	a decrease of $2.7 million in bad debt expense primarily due to warmer weather in Kansas;	
		
•	a decrease of $1.4 million in fleet-related expenses due primarily to lower fuel costs; and	
		
•	a decrease of $0.9 million in ad valorem taxes; offset partially by	
		
•	an increase of $16.3 million in employee-related costs due primarily to increases of $9.3 million in higher labor costs due to an increase in our number of employees and $7.0 million in benefit costs, which includes the impact of the changes in our discount rate for pension and other postemployment benefit costs compared with the prior year.	

Depreciation and amortization expense increased $7.3 million due primarily to an increase in depreciation of $12.1 million from capital expenditures being placed in service, offset partially by a decrease in the amortization of the ad valorem surcharge in Kansas and the take-or-pay rider in Oklahoma of $3.6 million.

2014 vs. 2013 - Net margin increased $14.0 million due primarily to the following:

•	an increase of $16.8 million from new rates, primarily in Texas and Oklahoma;	
		
•	an increase of $5.6 million in residential sales due primarily to customer growth;	
		
•	an increase of $4.7 million from higher volumes due primarily to weather-sensitive transportation customers; and	
		
•	an increase of $2.8 million in CNG revenue and higher line extension revenue from commercial and industrial customers in Oklahoma; offset partially by	
		
•	a decrease of $12.8 million in rider and surcharge recoveries due to a lower ad-valorem surcharge in Kansas and the expiration of the rider associated with the recovery of take-or-pay settlements in Oklahoma, both of which are offset by lower regulatory amortization in depreciation and amortization expense; and	
		
•	a decrease of $3.7 million due primarily to warmer weather in all three states compared with colder-than-normal weather in 2013, net of weather normalization.	

Operating costs increased $28.1 million due primarily to the following:

•	an increase of $13.0 million in outside service costs related primarily to $6.8 million of costs associated with our separation from ONEOK and $3.7 million in pipeline maintenance activities;	
		
•	an increase of $12.6 million in insurance, information technology and rent expenses;	
		
•	an increase of $11.0 million in employee-related expenses resulting from higher labor and compensation costs; and	
		
•	an increase of $1.7 million in bad debt expense; offset partially by	
		
•	a decrease of $8.0 million in benefit costs related primarily to lower pension and other postemployment benefit costs resulting from an annual change in the estimated discount rate.	

Depreciation and amortization expense increased due primarily to the settlement agreement approved by the KCC authorizing the separation of the Kansas Gas Service assets from ONEOK to us, whereby Kansas Gas Service agreed to expense a $10.2 million regulatory asset related to a transaction cost recovery and an increase in the amortization of amounts previously deferred for ad valorem taxes, which is offset in net margin.

Capital Expenditures - Our capital expenditures program includes expenditures for pipeline integrity, automated meter reading, extending service to new areas, modifications to customer service lines, increasing system capabilities, pipeline replacements, government-mandated relocation of pipelines, fleet and facilities, and information technology hardware and software. It is our practice to maintain and upgrade our infrastructure, facilities and systems to ensure safe, reliable and efficient operations.

Capital expenditures decreased $2.8 million for 2015, compared with 2014, due primarily to reduced spending on information technology hardware and software in 2014 related to our separation from ONEOK. Capital expenditures increased $5.0 million for 2014, compared with 2013, primarily as a result of an increase in spending on information technology hardware and software related to our separation from ONEOK. Our capital expenditures are expected to be approximately $305.0 million for 2016.

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Selected Operating Information - The following tables set forth certain selected operating information for the periods indicated:

	
																										
 	 	Years Ended	Variances	
 	 	December 31,	2015 vs. 2014	
(in thousands)	 	2015	2014	Increase (Decrease)	
Average Number of Customers	 	OK	KS	TX	Total	OK	KS	TX	Total	OK	KS	TX	Total	
Residential	 	783		579		606		1,968		776		578		601		1,955		7		1		5		13		
Commercial and industrial	 	73		50		34		157		72		50		34		156		1		—		—		1		
Wholesale and public authority	 	—		—		3		3		—		—		4		4		—		—		(1	)	(1	)	
Transportation	 	5		6		1		12		5		6		1		12		—		—		—		—		
Total customers	 	861		635		644		2,140		853		634		640		2,127		8		1		4		13		

	
																										
 	 	Years Ended	Variances	
 	 	December 31,	2014 vs. 2013	
(in thousands)	 	2014	2013	Increase (Decrease)	
Average Number of Customers	 	OK	KS	TX	Total	OK	KS	TX	Total	OK	KS	TX	Total	
Residential	 	776		578		601		1,955		770		577		597		1,944		6		1		4		11		
Commercial and industrial	 	72		50		34		156		72		50		33		155		—		—		1		1		
Wholesale and public authority	 	—		—		4		4		—		—		3		3		—		—		1		1		
Transportation	 	5		6		1		12		5		6		1		12		—		—		—		—		
Total customers	 	853		634		640		2,127		847		633		634		2,114		6		1		6		13		

	
										
 	 	Years Ended December 31,	
Volumes (MMcf)	 	2015	 	2014	 	2013	
Natural gas sales	 	 	 	 	 	 	
Residential	 	115,477		 	125,337		 	122,855		
Commercial and industrial	 	35,943		 	38,555		 	36,956		
Wholesale and public authority	 	2,615		 	2,454		 	4,403		
Total volumes sold	 	154,035		 	166,346		 	164,214		
Transportation	 	204,763		 	213,456		 	205,915		
Total volumes delivered	 	358,798		 	379,802		 	370,129		

Total volumes delivered decreased for 2015, compared with 2014, due primarily to warmer temperatures in 2015. Residential and commercial and industrial natural gas sales volumes increased for 2014, compared with 2013, due primarily to colder temperatures in the first quarter of 2014. The impacts on margins for the periods presented were mitigated largely by weather-normalization mechanisms.

Wholesale sales represent contracted natural gas volumes that exceed the needs of our residential, commercial and industrial customer base and are available for sale to other parties. The impact to net margin from changes in volumes associated with these customers is minimal.

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 	 	Years Ended	
 	 	December 31,	
 	 	2015	 	2014	 	2015 vs 2014	 	2015	 	2014	
Heating Degree Days	 	Actual	 	Normal	 	Actual	 	Normal	 	Actual Variance	 	Actual as a percent of Normal	
Oklahoma	 	3,135		 	3,317		 	3,720		 	3,317		 	(16	)%	 	95	%	 	112	%	
Kansas	 	4,264		 	4,860		 	5,179		 	4,860		 	(18	)%	 	88	%	 	107	%	
Texas	 	1,715		 	1,785		 	1,716		 	1,788		 	—	 %	 	96	%	 	96	%	

																						
 	 	Years Ended	
 	 	December 31,	
 	 	2014	 	2013	 	2014 vs 2013	 	2014	 	2013	
Heating Degree Days	 	Actual	 	Normal	 	Actual	 	Normal	 	Actual Variance	 	Actual as a percent of Normal	
Oklahoma	 	3,720		 	3,317		 	3,848		 	3,317		 	(3	)%	 	112	%	 	116	%	
Kansas	 	5,179		 	4,860		 	5,246		 	4,860		 	(1	)%	 	107	%	 	108	%	
Texas	 	1,716		 	1,788		 	1,942		 	1,793		 	(12	)%	 	96	%	 	108	%	

Normal HDDs are established through rate proceedings in each of our rate jurisdictions for use primarily in weather normalization billing calculations. Normal HDDs disclosed above are based on:
		
•	10-year weighted average HDDs as of December 31, 2014, for years 2005-2014, as calculated using 11 weather stations across Oklahoma and weighted on average customer count for Oklahoma;	
		
•	30-year average for years 1981-2010 published by the National Oceanic and Atmospheric Administration, as calculated using 13 weather stations across Kansas and weighted on HDDs by weather station and customers for Kansas; and	
		
•	a rolling 10-year average of actual natural gas distribution sales volumes by service area for Texas.	

Actual HDDs are based on quarter-to-date and year-to-date, weighted average of:
		
•	11 weather stations and customers by month for Oklahoma;	
		
•	13 weather stations and customers by month for Kansas; and	
		
•	9 weather stations and natural gas distribution sales volumes by service area for Texas.	

CONTINGENCIES

We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such matters will not have a material adverse effect on our results of operations, financial position or cash flows. See Note 14 of the Notes to Financial Statements in this Annual Report for information with respect to legal proceedings.

LIQUIDITY AND CAPITAL RESOURCES

General - From the date of the separation, we have funded operating expenses, working capital requirements, including purchases of natural gas and capital expenditures primarily with operating cash flows and commercial paper. Prior to the separation, we relied primarily on operating cash flow and participation in ONEOK’s cash management program for our liquidity and capital resource requirements.

We believe that the combination of the significant residential component of our customer base, the fixed-charge component of our natural gas sales net margin and our regulatory rate mechanisms that we have in place result in a stable cash flow profile. Because the energy consumption of residential customers is less volatile compared with commercial and industrial customers, our business historically has generated stable and predictable net margin and cash flows. Additionally, we have several regulatory rate mechanisms in place to reduce the lag in earning a return on our capital expenditures. We anticipate that our

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cash flow generated from operations and our expected short- and long-term financing arrangements will enable us to maintain our current and planned level of operations and provide us flexibility to finance our infrastructure investments.

Our ability to access capital markets for debt and equity financing under reasonable terms depends on market conditions and our financial condition and credit ratings. We believe that stronger credit ratings will provide a significant advantage to our business. By maintaining a conservative financial profile and stable revenue base, we believe that we will be able to maintain an investment-grade credit rating, which we believe will provide us access to diverse sources of capital at more favorable rates in order to finance our infrastructure investments. Credit rating agencies perform independent analyses when assigning credit ratings.

Short-term Financing - The ONE Gas Credit Agreement, which is scheduled to expire in January 2019, contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining ONE Gas’ total debt-to-capital ratio of no more than 70 percent at the end of any calendar quarter. The ONE Gas Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, indebtedness of subsidiaries, investments, changes in the nature of business, fundamental changes, transactions with affiliates, burdensome agreements, and use of proceeds. In the event of a breach of certain covenants by ONE Gas, amounts outstanding under the ONE Gas Credit Agreement may become due and payable immediately. At December 31, 2015, our total debt-to-capital ratio was 40 percent , and we were in compliance with all covenants under the ONE Gas Credit Agreement.

The ONE Gas Credit Agreement includes a $50 million sublimit for the issuance of standby letters of credit and also features an option to request an increase in the size of the facility to an aggregate of $1.2 billion from $700 million, upon satisfaction of customary conditions, including receipt of commitments from new lenders or increased commitments from existing lenders. Borrowings made under the facility are available for general corporate purposes. The ONE Gas Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating. Based on our current credit ratings, borrowings, if any, will accrue interest at LIBOR plus 79.5 basis points, and the annual facility fee is 8 basis points.

We may reduce the unutilized portion of the ONE Gas Credit Agreement in whole or in part without premium or penalty. The ONE Gas Credit Agreement contains customary events of default. Upon the occurrence of certain events of default, the obligations under the ONE Gas Credit Agreement may be accelerated and the commitments may be terminated.

We have a commercial paper program under which we may issue unsecured commercial paper up to a maximum amount of $700 million to fund short-term borrowing needs. The maturities of the commercial paper notes may vary but may not exceed 270 days from the date of issue. The commercial paper notes are generally sold at par less a discount representing an interest factor.

The ONE Gas Credit Agreement is available to repay the commercial paper notes, if necessary. Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONE Gas Credit Agreement.

At December 31, 2015, we had issued $12.5 million in the form of commercial paper, $1.0 million in letters of credit outstanding and had approximately $2.4 million of cash and cash equivalents. At December 31, 2015, we had no borrowings and $686.5 million of credit available under the ONE Gas Credit Agreement. The weighted-average interest rate on our commercial paper was 0.7 percent at December 31, 2015.

Debt Issuance - In January 2014, we issued senior notes, consisting of $300 million of 2.07 percent senior notes due 2019, $300 million of 3.61 percent senior notes due 2024 and $600 million of 4.658 percent senior notes due 2044 (collectively, our “Senior Notes”). The net proceeds were approximately $1.19 billion and were used to fund a one-time cash payment to ONEOK of approximately $1.13 billion as part of the separation. The remaining portion of the net proceeds was retained in order to provide sufficient financial flexibility and to support working capital requirements and capital expenditures.

The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding Senior Notes to declare those Senior Notes immediately due and payable in full.

We may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months, and six months, respectively, before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective Senior Notes plus

34

accrued and unpaid interest to the redemption date. Our Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

Credit Ratings - Our credit ratings as of January 31, 2016 were:

			
Rating Agency	Rating	Outlook	
Moody’s	A2	Stable	
S&P	A-	Stable	

Our commercial paper is currently rated Prime-1 by Moody’s and A-2 by S&P. We intend to maintain strong credit metrics while we pursue a balanced approach to capital investment and a return of capital to shareholders via a dividend that we believe will be competitive with our peer group.

Capitalization structure - As of December 31, 2015, our total capitalization structure was 40 percent debt to 60 percent equity.

Pension and Other Postemployment Benefit Plans - Information about our pension and other postemployment benefits plans, including anticipated contributions, is included under Note 12 of the Notes to Financial Statements in this Annual Report.

CASH FLOW ANALYSIS

Prior to the separation, we utilized ONEOK’s centralized cash management program that concentrated the cash assets of its operating divisions and subsidiaries in joint accounts for the purpose of providing financial flexibility and lowering the cost of borrowing, transaction costs and bank fees. Under this cash management program, depending on whether we had a short-term cash surplus or cash requirement, we provided cash to ONEOK or ONEOK provided cash to us when necessary. Subsequent to the separation, we maintain separate cash accounts from ONEOK, and our interest expense is related only to our borrowings.

We use the indirect method to prepare our Statements of Cash Flows. Under this method, we reconcile net income to cash flows provided by operating activities by adjusting net income for those items that impact net income but may not result in actual cash receipts or payments and changes in our assets and liabilities not classified as investing or financing activities during the period. Items that impact net income but may not result in actual cash receipts or payments include, but are not limited to, depreciation and amortization, deferred income taxes, share-based compensation expense and provision for doubtful accounts.

The following table sets forth the changes in cash flows by operating, investing and financing activities for the periods indicated:

																			
 	 	 	 	 	 	 	Variances	Variances	
 	Years Ended December 31,	 	2015 vs. 2014	2014 vs. 2013	
 	2015	 	2014	 	2013	 	Increase (Decrease)	Increase (Decrease)	
 	( Millions of dollars )	
Total cash provided by (used in):	 	 	 	 	 	 	 	 	
Operating activities	$	394.2		 	$	246.6		 	$	154.2		 	$	147.6		$	92.4		
Investing activities	(294.3	)	 	(297.1	)	 	(290.7	)	 	2.8		(6.4	)	
Financing activities	(109.4	)	 	59.2		 	135.7		 	(168.6	)	(76.5	)	
Change in cash and cash equivalents	(9.5	)	 	8.7		 	(0.8	)	 	(18.2	)	9.5		
Cash and cash equivalents at beginning of period	11.9		 	3.2		 	4.0		 	8.7		(0.8	)	
Cash and cash equivalents at end of period	$	2.4		 	$	11.9		 	$	3.2		 	$	(9.5	)	$	8.7		

Operating Cash Flows - Changes in cash flows from operating activities, before changes in operating assets and liabilities, are due primarily to changes in net margin and operating expenses discussed in Financial Results and Operating Information. Changes in natural gas prices and demand for our services or natural gas, whether because of general economic conditions, changes in supply or increased competition from other service providers, could affect our earnings and operating cash flows. Typically, our cash flows from operations are greater in the first half of the year compared with the second half of the year.

2015 vs. 2014 - Cash flows from operating assets and liabilities in our operating activities increased in 2015, compared to 2014, due primarily to the collection of trade receivables, tax receivables, payment of trade payables and the recovery of natural gas

35

purchase costs, including natural gas in storage, through our purchased-gas cost adjustment mechanisms, which were impacted by warmer weather and lower natural gas costs. The timing of cash collections from customers and payments to vendors and suppliers vary from period to period in the normal course of business and directly impact our cash flows from operations. In addition, our changes in income taxes receivable were impacted by an extension of the IRS rules for bonus depreciation.

2014 vs. 2013 - Cash flows from operating assets and liabilities in our operating activities increased in 2014, compared to 2013, due primarily to the collection of trade receivables, payment of trade payables and the recovery of natural gas purchase costs through our purchased-gas cost adjustment mechanisms. The timing of cash collections from customers and payments to vendors and suppliers vary from period to period in the normal course of business and directly impact our cash flows from operations.

Investing Cash Flows - 2015 vs. 2014 - Cash used in investing activities decreased for 2015, compared to 2014, due primarily to capital expenditures for information technology hardware and software associated with our separation from ONEOK.

2014 vs. 2013 - Cash used in investing activities increased for 2014, compared to 2013, due primarily to capital expenditures for information technology hardware and software associated with our separation from ONEOK.

Financing Cash Flows - 2015 vs. 2014 - Cash used in financing activities increased for 2015, compared with 2014, due primarily to an increase in the dividend rate of two cents, an additional quarter of dividends paid in 2015, a decrease in our outstanding notes payable, and purchases of treasury stock used to offset shares issued under our equity compensation and employee stock purchase plans.

2014 vs. 2013 - Cash used in financing activities decreased for 2014, compared with 2013 due primarily to the $1.19 billion debt issuance and $1.13 billion cash payment to ONEOK in connection with our separation from ONEOK in 2014, compared with our participation in ONEOK’s cash management program and our distributions to ONEOK in 2013.

ENVIRONMENTAL, SAFETY AND REGULATORY MATTERS

Environmental Matters -  We are subject to multiple historical, wildlife preservation and environmental laws and/or regulations that affect many aspects of our present and future operations. Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetland preservation, hazardous materials transportation, and pipeline and facility construction. These laws and regulations require us to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. In addition, emission controls and/or other regulatory or permitting mandates under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional statutes or regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We own or retain legal responsibility for the environmental conditions at 12 former manufactured natural gas sites in Kansas. These sites contain potentially harmful materials that are subject to control or remediation under various environmental laws and regulations. A consent agreement with the KDHE governs all work at these sites. The terms of the consent agreement allow us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis. Remediation involves typically the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater.

We have completed or addressed removal of the source of soil contamination at 11 of the 12 sites according to plans approved by KDHE. Regulatory closure has been achieved at three of the sites. We have begun site assessment at the remaining site where no active remediation has occurred.

Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during 2015, 2014 and 2013 . A number of environmental issues may exist with respect to manufactured gas plants.  With the trend toward stricter standards, greater regulation and more extensive permit requirements for the types of assets operated by us that are subject to environmental regulation, our environmental expenditures could increase in the future, and such expenditures may not be fully covered by insurance or recoverable in rates from our customers, and those costs may adversely affect our financial condition, results of operations and cash flows.

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Pipeline Safety -  We are subject to PHMSA regulations, including integrity-management regulations. PHMSA regulations require pipeline companies operating high-pressure transmission pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas. In January 2012, the Pipeline Safety, Regulatory Certainty and Job Creation Act was signed into law. The law increased maximum penalties for violating federal pipeline safety regulations and directs the DOT and the Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us. These issues include, but are not limited to, the following:

•	an evaluation of whether natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;	
		
•	a verification of records for pipelines in class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and	
		
•	a requirement to test previously untested pipelines operating above 30 percent yield strength in high-consequence areas.	

The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.

Air and Water Emissions -  The Clean Air Act, the Clean Water Act, analogous state laws and/or regulations promulgated thereunder, impose restrictions and controls regarding the discharge of pollutants into the air and water in the United States. Under the Clean Air Act, a federally enforceable operating permit is required for sources of significant air emissions. We may be required to incur certain capital expenditures for air-pollution-control equipment in connection with obtaining or maintaining permits and approvals for sources of air emissions. We do not expect that these expenditures will have a material impact on our respective results of operations, financial position or cash flows. The Clean Water Act imposes substantial potential liability for the removal of pollutants discharged to waters of the United States and remediation of waters affected by such discharge.

Federal, state and regional initiatives to measure and regulate greenhouse gas emissions are underway. We monitor relevant federal and state legislation to assess the potential impact on our operations. The EPA’s Mandatory Greenhouse Gas Reporting Rule requires annual greenhouse gas emissions reporting as carbon dioxide equivalents from affected facilities and for the natural gas delivered by us to our natural gas distribution customers who are not otherwise required to report their own emissions. The additional cost to gather and report this emission data did not have, and we do not expect it to have, a material impact on our results of operations, financial position or cash flows. In addition, Congress has considered, and may consider in the future, legislation to reduce greenhouse gas emissions, including carbon dioxide and methane. Likewise, the EPA may institute additional regulatory rulemaking associated with greenhouse gas emissions. At this time, no rule or legislation has been enacted that assesses any costs, fees or expenses on any of these emissions.

CERCLA -  The federal CERCLA, also commonly known as Superfund, imposes strict, joint and several liability, without regard to fault or the legality of the original act, on certain classes of “persons” (defined under CERCLA) that caused and/or contributed to the release of a hazardous substance into the environment. These persons include, but are not limited to, the owner or operator of a facility where the release occurred and/or companies that disposed or arranged for the disposal of the hazardous substances found at the facility. Under CERCLA, these persons may be liable for the costs of cleaning up the hazardous substances released into the environment, damages to natural resources and the costs of certain health studies. We do not expect that our responsibilities under CERCLA will have a material impact on our respective results of operations, financial position or cash flows.

Pipeline Security -  The United States Department of Homeland Security’s Transportation Security Administration issued updated pipeline security guidelines in April 2012. Our pipeline facilities have been reviewed according to the current guidelines and no material changes have been required to date.

Environmental Footprint -  Our environmental and climate change strategy focuses on taking steps to minimize the impact of our operations on the environment. These strategies include: (1) developing and maintaining an accurate greenhouse gas emissions inventory according to current rules issued by the EPA; (2) improving the efficiency of our various pipelines; (3) following developing technologies for emission control; and (4) utilizing practices to reduce the loss of methane from our facilities such as vintage pipe replacement which not only improves system integrity but also helps lower emissions.

We participate in the EPA’s Natural Gas STAR Program to voluntarily reduce methane emissions. We continue to focus on maintaining low rates of lost-and-unaccounted-for natural gas through expanded implementation of best practices to limit the

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release of natural gas during pipeline and facility maintenance and operations. Additionally, the EPA is currently developing a methane emissions partnership program expected to be finalized in 2016.

Regulatory - Several regulatory initiatives impacted the earnings and future earnings potential of our business. See additional information regarding our regulatory initiatives in Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Additional information about our environmental matters is included in the section entitled “Environmental Matters” in Note 14 of the Notes to Financial Statements in this Annual Report. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition and results of operations. Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during 2015, 2014 and 2013. We do not expect to incur material expenditures for these matters in the future.
 
IMPACT OF NEW ACCOUNTING STANDARDS

Information about the impact of new accounting standards is included in Note 1 of the Notes to Financial Statements in this Annual Report.

ESTIMATES AND CRITICAL ACCOUNTING POLICIES

The preparation of our financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ from our estimates. See our Risk Factors and/or Forward-Looking Statements for factors which could impact our estimates.

The following summary sets forth what we consider to be our most critical estimates and accounting policies. Our critical accounting policies are defined as those estimates and policies most important to the portrayal of our financial condition and results of operations and that require management’s most difficult, subjective or complex judgment, particularly because of the need to make estimates concerning the impact of inherently uncertain matters.

Regulation - Our operations are subject to regulation with respect to rates, service, maintenance of accounting records and various other matters by the respective regulatory authorities in the states in which we operate. We account for the financial effects of the ratemaking and accounting practices and policies of the various regulatory commissions in our financial statements. We record regulatory assets for costs that have been deferred for which future recovery through customer rates is considered probable and regulatory liabilities when it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process. As a result, certain costs that would normally be expensed under GAAP are capitalized or deferred on the balance sheet because it is probable they can be recovered through rates. Discontinuing the application of this method of accounting for regulatory assets and liabilities could significantly increase our operating expenses, as fewer costs would likely be capitalized or deferred on the balance sheet, which could reduce our net income. Further, regulation may impact the period in which revenues or expenses are recognized. The amounts to be recovered or recognized are based upon historical experience and our understanding of the regulations. The impact of regulation on our operations may be affected by decisions of the regulatory authorities or the issuance of new regulations.

For further discussion of regulatory assets and liabilities, see Note 9 of the Notes to Financial Statements in this Annual Report.

Impairment of Goodwill - We assess our goodwill for impairment at least annually as of July 1. Our goodwill impairment analysis performed in 2015 and 2014, utilized a qualitative assessment and did not result in any impairment indicators. Subsequent to July 1, 2015, no event has occurred indicating that the fair value is less than the carrying value.

As part of our goodwill impairment test, we first assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it is more likely than not that our fair value is less than our carrying amount. If further testing is necessary, we perform a two-step impairment test for goodwill. In the first step, an initial assessment is made by comparing our fair value with our book value, including goodwill. If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the

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impairment. In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets from the fair value determined in step one of the assessment. If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.

To estimate our fair value, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective. Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates. Under the market approach, we apply acquisition multiples to forecasted cash flows. The acquisition multiples used are consistent with historical asset transactions. The forecasted cash flows are based on average forecasted cash flows over a period of years.

Our impairment tests require the use of assumptions and estimates, such as industry economic factors and the profitability of future business strategies. If actual results are not consistent with our assumptions and estimates or our assumptions and estimates change due to new information, we may be exposed to future impairment charges.

See Note 1 of the Notes to Financial Statements in this Annual Report for further discussion of goodwill.

Pension and Other Postemployment Benefits - We have defined benefit retirement plans covering eligible full-time employees. We also sponsor welfare plans that provide other postemployment medical and life insurance benefits to eligible employees who retire with at least five years of service. In connection with the separation from ONEOK, we entered into an Employee Matters Agreement with ONEOK, which provides that our employees no longer participate in benefit plans sponsored or maintained by ONEOK as of the separation date. Effective January 1, 2014, the ONEOK defined benefit pension plans and other postemployment benefit plans transferred assets and obligations related to those employees transferring to ONE Gas and vested participants who are no longer employees to the new ONE Gas plans. As a result, we recorded sponsored pension and other postemployment plan obligations of approximately $1.1 billion , and sponsored pension and other postemployment plan assets of approximately $1.0 billion . Additionally, as a result of the transfer of unrecognized losses from ONEOK, our regulatory assets and deferred income taxes increased $331 million and $86 million , respectively.

Prior to the separation, eligible employees participated in similar defined benefit pension plans and other postemployment health and welfare plans (the Plans) sponsored by ONEOK. We accounted for these plans as multiemployer benefit plans. Accordingly, we did not record an asset or liability to recognize the funded status of the Plans. We recognized a liability only for any required contributions to the Plans that were accrued and unpaid at the balance sheet date. The related pension and other postemployment expenses were allocated to us based on plan participants who directly supported our operations. These pension and other postemployment benefit costs included amounts associated with vested participants who are no longer employees. As described in Note 2 of the Notes to Financial Statements in this Annual Report, prior to 2014, ONEOK also charged us for the allocated cost of certain employees of ONEOK who provided general and administrative services on our behalf. ONEOK included an allocation of the benefit costs associated with these ONEOK employees based upon its allocation methodology, not necessarily specific to the employees providing general and administrative services on our behalf. See Note 2 of the Notes to Financial Statements in this Annual Report for discussion of ONEOK’s allocation methodology.

To calculate the expense and liabilities related to our plans, we utilize an outside actuarial consultant, which uses statistical and other factors to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and employment periods. In determining the projected benefit costs, assumptions can change from period to period and may result in material changes in the costs we recognize.

In October 2015, plan amendments were approved to merge our frozen cash-balance defined benefit pension plan covering certain Texas Gas Service employees with our defined benefit pension plan covering certain eligible employees. In addition, we announced to eligible pre-65 participants in our postemployment medical plan a change from a self-insured postemployment medical plan to a plan providing participants an annual benefit that will allow them to select coverage on a healthcare exchange. As a result, we remeasured the respective plan assets and benefit obligations, effective October 1, 2015, which resulted in a reduction in benefit obligations of our postemployment benefit plan of $11.9 million at December 31, 2015. Net periodic benefit cost for the plans in 2015 was reduced by $3.4 million . See Note 12 of the Notes to Financial Statements in this Annual Report for additional information.

During 2015, we recorded net periodic benefit costs of $38.0 million and $5.0 million related to our pension plans and other postemployment benefit plans, respectively, prior to regulatory deferrals. We estimate that in 2016, we will record $32.0 million and $1.7 million related to pension plans and other postemployment benefit plans, respectively, prior to regulatory deferrals.

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The following table sets forth the weighted-average assumptions used to determine our estimated 2016 net periodic benefit cost related to our defined pension and other postemployment benefit plans, and sensitivity to changes with respect to these assumptions:

												
 	 	Rate Used	 	Cost
Sensitivity (a)	 	Obligation
Sensitivity (b)	
 	 	 	 	( Millions of dollars )	
Discount rate	 	4.75	%	 	$	3.7		 	$	37.3		
Expected long-term return on plan assets (c)	 	7.75%/8.0%		 	$	2.3		 	$	—		
(a) Approximate impact a quarter percentage point decrease in the assumed rate would have on net periodic pension costs.
(b) Approximate impact a quarter percentage point decrease in the assumed rate would have on defined benefit pension obligation.
(c) Expected long-term rate of return on plan assets for pension and other postemployment benefits are 7.75 percent and 8.0 percent, respectively.

Assumed health care cost-trend rates have a significant effect on the amounts reported for our other postemployment benefit plans. A one percentage point change in assumed health care cost trend rates would have the following effects:

									
 	 	One Percentage
Point Increase	 	One Percentage
Point Decrease	
 	 	( Millions of dollars )	
Effect on total of service and interest cost	 	$	0.8		 	$	(0.7	)	
Effect on other postemployment benefit obligation	 	$	3.6		 	$	(3.8	)	

During 2015, we contributed approximately $14.1 million to our other postemployment benefit plans. In 2016, we expect to contribute approximately $0.9 million and approximately $5.8 million to our defined benefit pension plan and other postemployment benefit plans, respectively.

Revenue Recognition - For regulated deliveries of natural gas, we read meters and bill customers on a monthly cycle. We recognize revenues upon the delivery of natural gas commodity or services rendered to customers. Revenues are accrued for natural gas delivered and services rendered to customers, but not yet billed, based on estimates from the last meter-reading date to month end (accrued unbilled revenue). The billing cycles for customers do not necessarily coincide with the accounting periods used for financial reporting purposes. We accrue unbilled revenues for natural gas that has been delivered but not yet billed at the end of an accounting period. Accrued unbilled revenue is based on a percentage estimate of amounts unbilled each month, which is dependent upon a number of factors, some of which require management’s judgment. These factors include customer consumption patterns and the impact of weather on usage.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures. We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be reasonably estimated. We expense legal fees as incurred and base our legal liability estimates on currently available facts and our assessments of the ultimate outcome or resolution. Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position or results of operations, and our expenditures related to environmental matters had no material effect on earnings or cash flows for 2015, 2014 and 2013. Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings.

See Note 14 of the Notes to Financial Statements in this Annual Report for additional discussion of contingencies.

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CONTRACTUAL OBLIGATIONS

The following table sets forth our contractual obligations at December 31, 2015:

																													
 	Contractual Obligations	
 	 	( Millions of dollars )	
 	 	2016	 	2017	 	2018	 	2019	 	2020	 	Thereafter	 	Total	
Commercial paper	 	$	12.5		 	$	—		 	$	—		 	$	—		 	$	—		 	$	—		 	$	12.5		
Long-term debt, including current maturities	 	—		 	—		 	—		 	300.0		 	—		 	901.3		 	1,201.3		
Interest payments on debt	 	45.1		 	45.1		 	45.1		 	39.4		 	38.9		 	649.2		 	862.8		
Firm transportation and storage capacity contracts	 	178.2		 	148.0		 	109.4		 	61.3		 	58.2		 	54.2		 	609.3		
Natural gas purchase commitments	 	158.1		 	5.0		 	2.0		 	1.5		 	0.9		 	1.5		 	169.0		
Employee benefit plans	 	6.7		 	4.4		 	4.5		 	25.5		 	37.5		 	—		 	78.6		
Operating leases	 	4.6		 	4.5		 	4.2		 	3.5		 	3.3		 	7.0		 	27.1		
Total	 	$	405.2		 	$	207.0		 	$	165.2		 	$	431.2		 	$	138.8		 	$	1,613.2		 	$	2,960.6		

Commercial paper - Commercial paper includes short-term notes payable with maturities that may vary but may not exceed 270 days from the date of issue.

Long-term debt and interest payments on debt - Long-term debt includes our three debt issuances at their due dates. Interest payments on debt are calculated by multiplying our long-term debt by the respective coupon rates.

Firm transportation and storage contracts - We are party to fixed-price contracts providing us with firm transportation and storage capacity. The commitments associated with these contracts are recoverable through our purchased-gas cost mechanisms as allowed by the applicable regulatory authority.

Natural gas purchase commitments - We are party to fixed-price and variable-price contracts for the purchase of natural gas. Future variable-price natural gas purchase commitments are estimated based on market price information. Actual future variable-price purchase commitments may vary depending on market prices at the time of delivery. As market information changes daily and is potentially volatile, these values may change significantly. The commitments associated with these contracts are recoverable through our purchased-gas cost mechanisms as allowed by the applicable regulatory authority.

Employee benefit plans - Employee benefit plans include our anticipated contribution to maintain the minimum required funding level for our pension and other postemployment benefit plans. See Note 12 of the Notes to Financial Statements in this Annual Report for discussion of employee benefit plans.

Operating leases - Our operating leases include leases for office space, facilities and information technology hardware and software.

FORWARD-LOOKING STATEMENTS

Some of the statements contained and incorporated in this Annual Report are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act.  The forward-looking statements relate to our anticipated financial performance, liquidity, management’s plans and objectives for our future operations, our business prospects, the outcome of regulatory and legal proceedings, market conditions and other matters.  We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995.  The following discussion is intended to identify important factors that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include the items identified in the preceding paragraph, the information concerning possible or assumed future results of our operations and other statements contained or incorporated in this Annual Report identified by words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “should,” “goal,” “forecast,” “guidance,” “could,” “may,” “continue,” “might,” “potential,” “scheduled,” and other words and terms of similar meaning.

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One should not place undue reliance on forward-looking statements, which are applicable only as of the date of this Annual Report.  Known and unknown risks, uncertainties and other factors may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by forward-looking statements.  Those factors may affect our operations, markets, products, services and prices.  In addition to any assumptions and other factors referred to specifically in connection with the forward-looking statements, factors that could cause our actual results to differ materially from those contemplated in any forward-looking statement include, among others, the following:

•	our ability to recover operating costs and amounts equivalent to income taxes, costs of property, plant and equipment and regulatory assets in our regulated rates;	
		
•	our ability to manage our operations and maintenance costs;	
		
•	changes in regulation, including the application of market rates by state and local agencies;	
		
•	the economic climate and, particularly, its effect on the natural gas requirements of our residential and	
commercial industrial customers;
		
•	competition from alternative forms of energy, including, but not limited to, solar power, wind power, geothermal energy and biofuels;	
		
•	conservation efforts of our customers;	
		
•	variations in weather, including seasonal effects on demand, the occurrence of storms and disasters, and climate change;	
		
•	indebtedness could make us more vulnerable to general adverse economic and industry conditions, limit our ability to borrow additional funds and/or place us at competitive disadvantage compared with competitors;	
		
•	our ability to secure reliable, competitively priced and flexible natural gas transportation and supply, including decisions by natural gas producers to reduce production or shut-in producing natural gas wells and expiration of existing supply and transportation arrangements that are not replaced with contracts with similar terms and pricing;	
		
•	the mechanical integrity of facilities operated;	
		
•	operational hazards and unforeseen operational interruptions;	
		
•	adverse labor relations;	
		
•	the effectiveness of our strategies to reduce earnings lag, margin protection strategies and risk mitigation strategies;	
		
•	our ability to generate sufficient cash flows to meet all of our cash needs;	
		
•	changes in the financial markets during the periods covered by the forward-looking statements, particularly those affecting the availability of capital and our ability to refinance existing debt and fund investments and acquisitions;	
		
•	actions of rating agencies, including the ratings of debt, general corporate ratings and changes in the rating agencies’ ratings criteria;	
		
•	changes in inflation and interest rates;	
		
•	our ability to purchase and sell assets at attractive prices and on other attractive terms;	
		
•	our ability to recover the costs of natural gas purchased for our customers;	
		
•	impact of potential impairment charges;	
		
•	volatility and changes in markets for natural gas;	
		
•	possible loss of LDC franchises or other adverse effects caused by the actions of municipalities;	
		
•	payment and performance by counterparties and customers as contracted and when due;	
		
•	changes in regulation of natural gas distribution services, particularly those in Oklahoma, Kansas and Texas;	
		
•	changes in law resulting from new federal or state energy legislation;	
		
•	changes in environmental, safety, tax and other laws to which we and our subsidiaries are subject;	
		
•	advances in technology;	
		
•	population growth rates and changes in the demographic patterns of the markets we serve;	
		
•	acts of nature and the potential effects of threatened or actual terrorism, including cyber attacks or breaches of technology systems and war;	
		
•	the sufficiency of insurance coverage to cover losses;	
		
•	the effects of our strategies to reduce tax payments;	
		
•	the effects of litigation and regulatory investigations, proceedings, including our rate cases, or inquiries;	
		
•	changes in accounting standards and corporate governance;	
		
•	discovery of material weaknesses in our internal controls;	
		
•	our ability to attract and retain talented management and directors;	
		
•	the results of financing efforts, including our ability to obtain financing on favorable terms, which can be affected by various factors, including our credit ratings and general economic conditions;	
		
•	declines in the market prices of debt and equity securities and resulting funding requirements for our defined benefit pension plans;	
		
•	the ability to successfully complete merger, acquisition or divestiture plans, regulatory or other limitations imposed as a result of a merger, acquisition or divestiture, and the success of the business following a merger, acquisition or divestiture;	

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•	the final resolutions or outcomes with respect to our contingent and other corporate liabilities related to the natural gas distribution business and any related actions for indemnification made pursuant to the Separation and Distribution Agreement; and	
		
•	the costs associated with increased regulation and enhanced disclosure and corporate governance requirements pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010.	

These factors are not necessarily all of the important factors that could cause actual results to differ materially from those expressed in any of our forward-looking statements.  Other factors could also have material adverse effects on our future results.  These and other risks are described in greater detail in Item 1A, Risk Factors, in this Annual Report.  All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. Other than as required under securities laws, we undertake no obligation to update publicly any forward-looking statement whether as a result of new information, subsequent events or change in circumstances, expectations or otherwise.

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our exposure to market risk discussed below includes forward-looking statements. Our views on market risk are not necessarily indicative of actual results that may occur and do not represent the maximum possible gains and losses that may occur since actual gains and losses will differ from those estimated based on actual fluctuations in commodity prices or interest rates and the timing of transactions.

Commodity Price Risk

Our commodity price risk, driven primarily by fluctuations in the price of natural gas, is mitigated by our purchased-gas cost adjustment mechanisms. We use derivative instruments to economically hedge the cost of anticipated natural gas purchases during the winter heating months to protect our customers from upward market price volatility of natural gas. Additionally, we inject natural gas into storage during the summer months and withdraw the natural gas during the winter heating season. Gains or losses associated with these derivative instruments and storage activities are included in, and recoverable through our purchased-gas cost adjustment mechanisms, which are subject to review by regulatory authorities.

Interest-Rate Risk

We are exposed to interest-rate risk primarily associated with new debt financing needed to fund capital requirements, including future contractual obligations and maturities of long-term and short-term debt. We expect to manage interest-rate risk on future borrowings through the use of fixed-rate debt, floating-rate debt and, at times, interest-rate swaps. Fixed-rate swaps may be used to reduce our risk of increased interest costs during periods of rising interest rates. Floating-rate swaps may be used to convert the fixed rates of long-term borrowings into short-term variable rates.

Counterparty Credit Risk

We assess the creditworthiness of our customers. Those customers who do not meet minimum standards are required to provide security, including deposits and other forms of collateral, when appropriate. With more than 2 million customers across three states, we are not exposed materially to a concentration of credit risk. We maintain a provision for doubtful accounts based upon factors surrounding the credit risk of customers, historical trends, consideration of the current credit environment and other information. In most jurisdictions, we are able to recover natural gas costs related to uncollectible accounts through our purchased-gas cost adjustment mechanisms.

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ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of ONE Gas, Inc.:

In our opinion, the accompanying balance sheets and the related statements of income, comprehensive income, equity and cash flows present fairly in all material respects, the financial position of ONE Gas, Inc. (the Company) at December 31, 2015 and 2014, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2015 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control Over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements and on the Company’s internal control over financial reporting based on our audits (which were integrated audits in 2015 and 2014). We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma
February 18, 2016

45

	
													
ONE Gas, Inc.	 	 	 	 	 	 	
STATEMENTS OF INCOME	 	 	 	 	 	 	
 	 	 	 	 	 	 	
 	 	Years Ended December 31,	
 	 	2015	 	2014	 	2013	
 	 	( Thousands of dollars, except per share amounts )	
 	 	 	 	 	 	 	
Revenues	 	$	1,547,692		 	$	1,818,906		 	$	1,689,952		
Cost of natural gas	 	705,959		 	991,949		 	876,944		
Net margin	 	841,733		 	826,957		 	813,008		
Operating expenses	 	 		 	 		 	 		
Operations and maintenance	 	414,476		 	420,686		 	393,072		
Depreciation and amortization	 	133,023		 	125,722		 	144,758		
General taxes	 	55,105		 	55,255		 	54,830		
Total operating expenses	 	602,604		 	601,663		 	592,660		
Operating income	 	239,129		 	225,294		 	220,348		
Other income	 	263		 	1,625		 	6,165		
Other expense	 	(2,813	)	 	(2,949	)	 	(3,680	)	
Interest expense	 	(44,570	)	 	(45,842	)	 	(61,366	)	
Income before income taxes	 	192,009		 	178,128		 	161,467		
Income taxes	 	(72,979	)	 	(68,338	)	 	(62,272	)	
Net income	 	$	119,030		 	$	109,790		 	$	99,195		
 	 	 	 	 	 	 	
Earnings per share	 	 	 	 	 	 	
Basic	 	$	2.26		 	$	2.10		 	$	1.90		
Diluted	 	$	2.24		 	$	2.07		 	$	1.90		
 	 	 	 	 	 	 	
Average shares ( thousands )	 	 	 	 	 	 	
Basic	 	52,578		 	52,364		 	52,319		
Diluted	 	53,254		 	52,946		 	52,319		
Dividends declared per share of stock	 	$	1.20		 	$	0.84		 	$	—		
See accompanying Notes to Financial Statements.

46

	
													
ONE Gas, Inc.	 	 	 	 	 	 	
STATEMENTS OF COMPREHENSIVE INCOME	 	 	 	 	 	 	
 	 	 	 	 	 	 	
 	 	Years Ended December 31,	
 	 	2015	 	2014	 	2013	
 	 	( Thousands of dollars )	
Net income	 	$	119,030		 	$	109,790		 	$	99,195		
Other comprehensive income (loss), net of tax	 	 		 	 		 	 		
Change in pension and other postemployment benefit plans liability, net of tax of $(483), $1,244, and $0, respectively	 	773		 	(1,781	)	 	—		
Total other comprehensive income (loss), net of tax	 	773		 	(1,781	)	 	—		
Comprehensive income	 	$	119,803		 	$	108,009		 	$	99,195		
See accompanying Notes to Financial Statements.

47

	
									
ONE Gas, Inc.		 		 	
BALANCE SHEETS		 		 	
					
 		December 31,		December 31,	
 		2015		2014	
Assets		( Thousands of dollars )	
Property, plant and equipment		 			 		
Property, plant and equipment		$	5,132,682			$	4,850,201		
Accumulated depreciation and amortization		1,620,771			1,556,481		
Net property, plant and equipment		3,511,911			3,293,720		
Current assets		 		 	
Cash and cash equivalents		2,433			11,943		
Accounts receivable, net		216,343			326,749		
Materials and supplies	 	33,325		 	27,511		
Income tax receivable	 	38,877		 	43,800		
Natural gas in storage		142,153			185,300		
Regulatory assets		32,925			50,193		
Other current assets		16,789			22,005		
Total current assets		482,845			667,501		
Goodwill and other assets		 			 		
Regulatory assets		435,863			478,723		
Goodwill		157,953			157,953		
Other assets		55,838			51,313		
Total goodwill and other assets		649,654			687,989		
Total assets		$	4,644,410			$	4,649,210		
See accompanying Notes to Financial Statements.

48

	
									
ONE Gas, Inc.		 		 	
BALANCE SHEETS		 		 	
(Continued)					
 		December 31,		December 31,	
 		2015		2014	
Equity and Liabilities		( Thousands of dollars )	
Equity and long-term debt					
Common stock, $0.01 par value:
authorized 250,000,000 shares; issued 52,598,005 shares and outstanding 52,259,224 shares at
December 31, 2015; authorized 250,000,000 shares, issued and outstanding 52,083,859 shares at
December 31, 2014		$	526			$	521		
Paid-in capital		1,764,875			1,758,796		
Retained earnings		95,046			39,894		
Accumulated other comprehensive income (loss)		(4,401	)		(5,174	)	
Treasury stock, at cost: 338,781 shares at December 31, 2015 and no shares at December 31, 2014		(14,491	)		—		
Total equity		1,841,555			1,794,037		
Long-term debt, excluding current maturities		1,201,305			1,201,311		
Total equity and long-term debt		3,042,860			2,995,348		
Current liabilities		 		 	
Current maturities of long-term debt		7			6		
Notes payable	 	12,500		 	42,000		
Accounts payable		107,482			159,064		
Accrued interest	 	18,873		 	18,872		
Accrued taxes other than income		37,249			44,742		
Accrued liabilities		31,470			26,019		
Customer deposits		60,325			60,003		
Regulatory liabilities		24,615			32,467		
Other current liabilities		11,700			9,260		
Total current liabilities		304,221			392,433		
Deferred credits and other liabilities		 			 		
Deferred income taxes		951,785			894,585		
Employee benefit obligations	 	272,309		 	287,779		
Other deferred credits		73,235			79,065		
Total deferred credits and other liabilities		1,297,329			1,261,429		
Commitments and contingencies							
Total liabilities and equity		$	4,644,410			$	4,649,210		
See accompanying Notes to Financial Statements.

49

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50

	
													
ONE Gas, Inc.		 		 		 	
STATEMENTS OF CASH FLOWS			
		Years Ended December 31,	
 		2015		2014		2013	
 		( Thousands of dollars )	
Operating activities		 		 		 	
Net income		$	119,030			$	109,790			$	99,195		
Adjustments to reconcile net income to net cash provided by operating activities:									
Depreciation and amortization		133,023			125,722			144,758		
Deferred income taxes		63,789			49,935			62,205		
Share-based compensation expense		9,187			7,613			—		
Provision for doubtful accounts		4,520			7,195			5,460		
Changes in assets and liabilities:		 			 			 	
Accounts receivable		105,886			23,044			(102,142	)	
Materials and supplies	 	(5,814	)	 	10,868		 	(1,668	)	
Income tax receivable		4,923			(43,800	)		—		
Natural gas in storage		43,147			(19,172	)		(63,139	)	
Asset removal costs		(51,608	)		(47,125	)		(46,567	)	
Affiliate payable		—			—			(8,140	)	
Accounts payable		(59,635	)		(6,881	)		37,241		
Accrued interest	 	1		 	18,743		 	(1	)	
Accrued taxes other than income		(7,493	)		12,316			2,449		
Accrued liabilities		5,451			21,228			(5,443	)	
Customer deposits		322			2,643			(727	)	
Regulatory assets and liabilities		50,658			30,067			29,436		
Employee benefit obligation		(15,033	)		(10,102	)		—		
Other assets and liabilities		(6,147	)		(45,421	)		1,291		
Cash provided by operating activities		394,207			246,663			154,208		
Investing activities		 			 			 		
Capital expenditures		(294,320	)		(297,103	)		(292,080	)	
Proceeds from sale of assets		—			—			1,327		
Cash used in investing activities		(294,320	)		(297,103	)		(290,753	)	
Financing activities		 			 			 		
Settlement of short-term notes payable to ONEOK, net		—			—			150,851		
Borrowings on notes payable, net		(29,500	)		42,000			—		
Repurchase of common stock	 	(24,122	)	 	—		 	—		
Issuance of debt, net of discounts		—			1,199,994			—		
Long-term debt financing costs		—			(11,087	)		—		
Cash payment to ONEOK upon separation		—			(1,130,000	)		—		
Issuance of common stock		7,051			2,001			—		
Dividends paid		(62,826	)		(43,696	)		—		
Repayment of long-term debt		—			—			(206	)	
Distributions to ONEOK		—			—			(14,969	)	
Cash provided by (used in) financing activities		(109,397	)		59,212			135,676		
Change in cash and cash equivalents		(9,510	)		8,772			(869	)	
Cash and cash equivalents at beginning of period		11,943			3,171			4,040		
Cash and cash equivalents at end of period		$	2,433			$	11,943			$	3,171		
Supplemental cash flow information:		 			 				
Cash paid for interest, net of amounts capitalized		$	42,980			$	21,066			$	—		
Cash paid to ONEOK for interest, net of amounts capitalized	 	$	—		 	$	—		 	$	61,366		
Cash (received) paid for income taxes, net		$	(5,423	)		$	44,603			$	—		
Cash paid to ONEOK for income taxes		$	—			$	—			$	67		
See accompanying Notes to Financial Statements.

51

	
												
ONE Gas, Inc.	 	 	 	 	
STATEMENTS OF EQUITY	 	 	 	 	
 	 	 	 	 	
 	Common Stock Issued	Common Stock	Paid-in Capital	Retained Earnings	
 	(Shares)	( Thousands of dollars )	
 	 	 	 	 	
January 1, 2013	—		$	—		$	—		$	—		
Net income	—		—		—		—		
Distributions to ONEOK	—		—		—		—		
Common stock issued	100		—		—		—		
December 31, 2013	100		—		—		—		
Net income	—		—		—		84,214		
Other comprehensive loss	—		—		—		—		
Net transfers from ONEOK	—		—		—		—		
Reclassification of Owner’s net investment to paid-in capital	—		—		1,749,078		—		
Issuance of common stock at the separation	51,941,136		520		(520	)	—		
Common stock issued	142,623		1		9,614		—		
Common stock dividends - $0.84 per share	—		—		624		(44,320	)	
December 31, 2014	52,083,859		521		1,758,796		39,894		
Net income	—		—		—		119,030		
Other comprehensive income	—		—		—		—		
Repurchase of common stock	—		—		—		—		
Common stock issued	514,146		5		5,027		—		
Common stock dividends - $1.20 per share	—		—		1,052		(63,878	)	
December 31, 2015	52,598,005		$	526		$	1,764,875		$	95,046		
See accompanying Notes to Financial Statements.

52

	
													
ONE Gas, Inc.	 	 	 	 	
STATEMENTS OF EQUITY	 	 	
(Continued)	 	 	 	 	
 	Treasury Stock	Owner’s Net Investment	Accumulated Other Comprehensive Income (Loss)	Total Equity	
 	 	( Thousands of dollars )	
 	 	 	 	 	
January 1, 2013	$	—		$	1,154,797		$	—		$	1,154,797		
Net income	—		99,195		—		99,195		
Distributions to ONEOK	—		(14,969	)	—		(14,969	)	
Common stock issued	—		—		—		—		
December 31, 2013	—		1,239,023		—		1,239,023		
Net income	—		25,576		—		109,790		
Other comprehensive loss	—		—		(1,781	)	(1,781	)	
Net transfers from ONEOK	—		484,479		(3,393	)	481,086		
Reclassification of Owner’s net investment to paid-in capital	—		(1,749,078	)	—		—		
Issuance of common stock at the separation	—		—		—		—		
Common stock issued	—		—		—		9,615		
Common stock dividends - $0.84 per share	—		—		—		(43,696	)	
December 31, 2014	—		—		(5,174	)	1,794,037		
Net income	—		—		—		119,030		
Other comprehensive income	—		—		773		773		
Repurchase of common stock	(24,122	)	—		—		(24,122	)	
Common stock issued	9,631		—		—		14,663		
Common stock dividends - $1.20 per share	—		—		—		(62,826	)	
December 31, 2015	$	(14,491	)	$	—		$	(4,401	)	$	1,841,555		
See accompanying Notes to Financial Statements.

53

ONE Gas, Inc.
NOTES TO FINANCIAL STATEMENTS

1.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	

Organization and Nature of Operations  - Prior to January 31, 2014, ONE Gas was a wholly owned subsidiary of ONEOK and comprised its former natural gas distribution business. On January 8, 2014, ONEOK’s board of directors approved the distribution of all the shares of our common stock to holders of ONEOK common stock. On January 31, 2014, we became an independent, publicly traded company as a result of a distribution by ONEOK of our common stock to ONEOK’s shareholders. Our common stock began trading “regular-way” under the ticker symbol “OGS” on the NYSE on February 3, 2014.

We provide natural gas distribution services to more than 2 million customers through our divisions in Oklahoma, Kansas and Texas through Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively. We serve residential, commercial, industrial and transportation customers in all three states. In addition, we also provide natural gas distribution services to wholesale and public authority customers.

Basis of Presentation - Prior to our separation from ONEOK, our financial statements were derived from ONEOK’s financial statements, which included its natural gas distribution business as if we, for accounting purposes, had been a separate company for all periods presented. The assets and liabilities in the financial statements have been reflected on a historical basis. The financial statements for periods prior to the separation also include expense allocations for certain corporate functions historically performed by ONEOK, including allocations of general corporate expenses related to executive oversight, accounting, treasury, tax, legal, information technology and other services. We believe our assumptions underlying the financial statements, including the assumptions regarding the allocation of general corporate expenses from ONEOK, are reasonable. However, the financial statements may not include all of the actual expenses that would have been incurred by us and may not reflect our results of operations, financial position and cash flows had we been a separate publicly traded company during the periods presented prior to the separation.

Because the operations of the natural gas distribution business within ONEOK were conducted through separate divisions, ONEOK’s net investment in us, excluding the long-term line of credit with ONEOK, is shown as owner’s net investment in lieu of equity in the financial statements prior to the separation. Transactions between ONEOK and us that were not part of the long-term line of credit with ONEOK or the short-term note payable to ONEOK have been identified in the Statements of Equity as a net transfer from ONEOK.

All financial information presented after the separation represents the results of operations, financial position and cash flows of ONE Gas. Accordingly:

•	Our Statements of Income and Comprehensive Income for the year ended December 31, 2014 , consist of the results of ONE Gas for the eleven months ended December 31, 2014 , and the results of ONE Gas Predecessor for the one month ended January 31, 2014. Our Statements of Income and Comprehensive Income for the year ended December 31, 2013 , consist entirely of the results of ONE Gas Predecessor. Our net income for the period prior to January 31, 2014, was recorded to owner’s net investment.	
		
•	Our Statement of Cash Flows for the year ended December 31, 2014 , consists of the results of ONE Gas for the eleven months ended December 31, 2014 , and the results of ONE Gas Predecessor for the one month ended January 31, 2014. Our Statement of Cash Flows for the year ended December 31, 2013 , consists entirely of the results of ONE Gas Predecessor.	
		
•	Our Statement of Equity for the year ended December 31, 2014 , consists of both the activity for ONE Gas Predecessor prior to January 31, 2014, and the activity for ONE Gas completed in connection with, and subsequent to, the separation on January 31, 2014. Our Statement of Equity for the year ended December 31, 2013 , consists entirely of the results of ONE Gas Predecessor.	

The financial statements include the accounts of the natural gas distribution business as set forth in “Organization and Nature of Operations” above. All significant balances and transactions between our divisions have been eliminated.

Use of Estimates - The preparation of our financial statements and related disclosures in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions that cannot be known with certainty that affect the reported amount of assets and liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements. These estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Items that may be estimated include, but are not limited to, the economic useful life of assets, fair value of assets and liabilities, provisions for doubtful accounts receivable, unbilled revenues for natural gas delivered but for which meters have

54

not been read, natural gas purchased but for which no invoice has been received, provision for income taxes, including any deferred tax valuation allowances, the results of litigation and various other recorded or disclosed amounts.

We evaluate these estimates on an ongoing basis using historical experience and other methods we consider reasonable based on the particular circumstances. Nevertheless, actual results may differ significantly from the estimates. Any effects on our financial position or results of operations from revisions to these estimates are recorded in the period when the facts that give rise to the revision become known.

Fair Value Measurements -   We define fair value as the price that would be received from the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date. We use the market and income approaches to determine the fair value of our assets and liabilities and consider the markets in which the transactions are executed. We measure the fair value of a group of financial assets and liabilities consistent with how a market participant would price the net risk exposure at the measurement date.

Fair Value Hierarchy - At each balance sheet date, we utilize a fair value hierarchy to classify fair value amounts recognized or disclosed in our financial statements based on the observability of inputs used to estimate such fair value. The levels of the hierarchy are described below:

•	Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;	
		
•	Level 2 - Significant observable pricing inputs other than quoted prices included within Level 1 that are, either directly or indirectly, observable as of the reporting date. Essentially, this represents inputs that are derived principally from or corroborated by observable market data; and	
		
•	Level 3 - May include one or more unobservable inputs that are significant in establishing a fair value estimate. These unobservable inputs are developed based on the best information available and may include our own internal data.	

We recognize transfers into and out of the levels as of the end of each reporting period.

Determining the appropriate classification of our fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data. We categorize derivatives for which fair value is determined using multiple inputs within a single level, based on the lowest level input that is significant to the fair value measurement in its entirety. See Note 8 for additional information regarding our fair value measurements.

Cash and Cash Equivalents - Cash equivalents consist of highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.

Revenue Recognition  - For regulated deliveries of natural gas, we read meters and bill customers on a monthly cycle. We recognize revenues upon the delivery of the natural gas commodity or services rendered to customers. The billing cycles for customers do not necessarily coincide with the accounting periods used for financial reporting purposes. Revenues are accrued for natural gas delivered and services rendered to customers, but not yet billed. Accrued unbilled revenue is based on a percentage estimate of amounts unbilled each month, which is dependent upon a number of factors, some of which require management’s judgment. These factors include customer consumption patterns and the impact of weather on usage. The amounts of accrued unbilled natural gas sales revenues at December 31, 2015 and 2014 , were $109.6 million and $141.7 million , respectively.

Accounts Receivable - Accounts receivable represent valid claims against nonaffiliated customers for natural gas sold or services rendered, net of allowances for doubtful accounts. We assess the creditworthiness of our customers. Those customers who do not meet minimum standards are required to provide security, including deposits and other forms of collateral, when appropriate. With more than 2 million customers across three states, we are not exposed materially to a concentration of credit risk. We maintain an allowance for doubtful accounts based upon factors surrounding the credit risk of customers, historical trends, consideration of the current credit environment and other information. In Oklahoma, Kansas and most jurisdictions we serve in Texas, we are able to recover natural gas costs related to doubtful accounts through purchased-gas cost adjustment mechanisms. At December 31, 2015 and 2014 , our allowance for doubtful accounts was $3.5 million and $4.0 million , respectively.

Inventories - Natural gas in storage is maintained on the basis of weighted-average cost. Natural gas inventories that are injected into storage are recorded in inventory based on actual purchase costs, including storage and transportation costs. Natural gas inventories that are withdrawn from storage are accounted for in our purchased-gas cost adjustment mechanisms at the weighted-average inventory cost.

55

Materials and supplies inventories, which are included in other current assets on our Balance Sheets, are stated at the lower of weighted-average cost or net realizable value. Our materials and supplies inventories totaled $33.3 million and $27.5 million at December 31, 2015 and 2014 , respectively.

Derivatives and Risk Management Activities - We record all derivative instruments at fair value, with the exception of normal purchases and normal sales that are expected to result in physical delivery. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and, if so, the reason for holding it, or if regulatory rulings require a different accounting treatment.

If certain conditions are met, we may elect to designate a derivative instrument as a hedge of exposure to changes in fair values or cash flows.

The table below summarizes the various ways in which we account for our derivative instruments and the impact on our financial statements:

					
 	 	Recognition and Measurement	
Accounting Treatment	 	Balance Sheet	 	Income Statement	
Normal purchases and
normal sales	-	Fair value not recorded	-	Change in fair value not recognized in earnings	
Mark-to-market	-	Recorded at fair value	-	Change in fair value recognized in, and
recoverable through, the purchased-gas cost adjustment mechanisms	

We have not elected to designate any of our derivative instruments as hedges. Gains or losses associated with the fair value of commodity derivative instruments entered into by us are included in, and recoverable through, the purchased-gas cost adjustment mechanisms.

See Note 8 for additional information regarding our fair value measurements and hedging activities using derivatives.

Property, Plant and Equipment - Our properties are stated at cost, which includes direct construction costs such as direct labor, materials, burden and AFUDC. Generally, the cost of our property retired or sold, plus removal costs, less salvage, is charged to accumulated depreciation. Gains and losses from sales or retirement of an entire operating unit or system of our properties are recognized in income. Maintenance and repairs are charged directly to expense.

AFUDC represents the cost of borrowed funds used to finance construction activities. We capitalize interest costs during the construction or upgrade of qualifying assets. Capitalized interest is recorded as a reduction to interest expense.

Our properties are depreciated using the straight-line method over their estimated useful lives. Generally, we apply composite depreciation rates to functional groups of property having similar economic circumstances. We periodically conduct depreciation studies to assess the economic lives of our assets. These depreciation studies are completed as a part of our rate proceedings, and the changes in economic lives, if applicable, are implemented prospectively when the new rates are effective. Changes in the estimated economic lives of our property, plant and equipment could have a material effect on our financial position, results of operations or cash flows.

Property, plant and equipment on our Balance Sheets includes construction work in process for capital projects that have not yet been placed in service and therefore are not being depreciated. Assets are transferred out of construction work in process when they are substantially complete and ready for their intended use.

See Note 10 for additional information regarding our property, plant and equipment.

Impairment of Goodwill and Long-Lived Assets - We assess our goodwill for impairment at least annually as of July 1. Total goodwill was $158.0 million at December 31, 2015 and 2014 , respectively. Our goodwill impairment analysis performed in 2015, 2014 and 2013 , utilized a qualitative assessment and did not result in any impairment indicators. Subsequent to July 1, 2015 , no event has occurred indicating that it is more likely that not that our fair value is less than our carrying value of our net assets.

As part of our goodwill impairment test, we first assess qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors and overall financial performance) to determine whether it is more likely than not that our

56

fair value is less than our carrying amount. If further testing is necessary, we perform a two-step impairment test for goodwill. In the first step, an initial assessment is made by comparing our fair value with our book value, including goodwill. If the fair value is less than the book value, an impairment is indicated, and we must perform a second test to measure the amount of the impairment. In the second test, we calculate the implied fair value of the goodwill by deducting the fair value of all tangible and intangible net assets from the fair value determined in step one of the assessment. If the carrying value of the goodwill exceeds the implied fair value of the goodwill, we will record an impairment charge.

To estimate our fair value, we use two generally accepted valuation approaches, an income approach and a market approach, using assumptions consistent with a market participant’s perspective. Under the income approach, we use anticipated cash flows over a period of years plus a terminal value and discount these amounts to their present value using appropriate discount rates. Under the market approach, we apply acquisition multiples to forecasted cash flows. The acquisition multiples used are consistent with historical asset transactions. The forecasted cash flows are based on average forecasted cash flows over a period of years.

We assess our long-lived assets for impairment whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable. An impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset. If an impairment is indicated, we record an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset. We determined that there were no asset impairments in 2015, 2014 or 2013 .

Regulation - We are subject to the rate regulation and accounting requirements of the OCC, KCC, RRC and various municipalities in Texas. We follow the accounting and reporting guidance for regulated operations. During the ratemaking process, regulatory authorities set the framework for what we can charge customers for our services and establish the manner that our costs are accounted for, including allowing us to defer recognition of certain costs and permitting recovery of the amounts through rates over time, as opposed to expensing such costs as incurred. Examples include weather normalization, unrecovered purchased-gas costs, pension and postemployment benefit costs and ad valorem taxes. This allows us to stabilize rates over time rather than passing such costs on to the customer for immediate recovery. Actions by regulatory authorities could have an effect on the amount recovered from rate payers. Any difference in the amount recoverable and the amount deferred is recorded as income or expense at the time of the regulatory action. A write-off of regulatory assets and costs not recovered may be required if all or a portion of the regulated operations have rates that are no longer:

•	established by independent regulators;	
		
•	designed to recover the specific entity’s costs of providing regulated services; and	
		
•	set at levels that will recover our costs when considering the demand and competition for our services.	

See Note 9 for additional information regarding our regulatory assets and liabilities disclosures.

Pension and Other Postemployment Employee Benefits - We have defined benefit retirement plans covering eligible employees. We also sponsor welfare plans that provide other postemployment medical and life insurance benefits to eligible employees who retire with at least five years of service. To calculate the costs and liabilities related to our plans, we utilize an outside actuarial consultant, which uses statistical and other factors to anticipate future events. These factors include assumptions about the discount rate, expected return on plan assets, rate of future compensation increases, age and mortality and employment periods. In determining the projected benefit obligations and costs, assumptions can change from period to period and may result in material changes in the cost and liabilities we recognize.

Prior to the separation, certain employees participated in pension and other postemployment employee benefit plans sponsored by ONEOK. We accounted for these plans as multiemployer benefit plans. Accordingly, we did not record an asset or liability to recognize the funded status of these plans. We recognized a liability only for any required contributions to those plans that were accrued and unpaid at the balance sheet date. The related pension and other postemployment expenses were allocated to us based on plan participants who directly supported our operations. These pension and other postemployment benefit costs included amounts associated with vested participants who are no longer employees.

Prior to the separation, certain benefit costs associated with employees who directly supported our operations were determined based on a specific employee basis. We were also allocated benefit costs associated with employees of ONEOK that provided general corporate services. These amounts were charged to us by ONEOK as described in Note 2. Prior to the separation, we were not the plan sponsor for the ONEOK pension and other postemployment benefit plans. Accordingly, our balance sheets prior to the separation do not reflect any assets or liabilities related to these plans. See Note 12 for additional information regarding pension and other postemployment employee benefit plans.

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Income Taxes - Deferred income taxes are recorded for the difference between the financial statement and income tax basis of assets and liabilities and carryforward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse. The effect on deferred taxes of a change in tax rates is deferred and amortized for operations regulated by the OCC, KCC, RRC and various municipalities in Texas, if, as a result of an action by a regulator, it is probable that the effect of the change in tax rates will be recovered from or returned to customers through future rates. We continue to amortize previously deferred investment tax credits for ratemaking purposes over the periods prescribed by our regulators.

A valuation allowance for deferred tax assets is recognized when it is more likely than not that some or all of the benefit from the deferred tax asset will not be realized. To assess that likelihood, we use estimates and judgment regarding our future taxable income, as well as the jurisdiction in which such taxable income is generated, to determine whether a valuation allowance is required. Such evidence can include our current financial position, our results of operations, both actual and forecasted, the reversal of deferred tax liabilities, as well as the current and forecasted business economics of our industry. We had no valuation allowance at December 31, 2015 and 2014 .

We utilize a more-likely-than-not recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position that is taken or expected to be taken in a tax return. We reflect penalties and interest as part of income tax expense as they become applicable for tax provisions that do not meet the more-likely-than-not recognition threshold and measurement attribute. There were no material uncertain tax positions at December 31, 2015 and 2014 .

See Note 13 for additional information regarding income taxes.

Asset Retirement Obligations - Asset retirement obligations represent legal obligations associated with the retirement of long-lived assets that result from the acquisition, construction, development and/or normal use of the asset. Certain long-lived assets that comprise our natural gas distribution systems, primarily our pipeline assets, are subject to agreements or regulations that give rise to an asset retirement obligation for removal or other disposition costs associated with retiring the assets in place upon the discontinued use of the natural gas distribution system. We recognize the fair value of a liability for an asset retirement obligation in the period when it is incurred if a reasonable estimate of the fair value can be made. We are not able to estimate reasonably the fair value of the asset retirement obligations for portions of our assets because the settlement dates are indeterminable given our expected continued use of the assets with proper maintenance. We expect our natural gas distribution systems will continue in operation as long as natural gas supply and demand for natural gas distribution service exists. Based on the widespread use of natural gas for heating and cooking activities by residential and commercial customers in our service areas, management expects supply and demand to exist for the foreseeable future.

In accordance with long-standing regulatory treatment, we collect through rates the estimated costs of removal on certain regulated properties through depreciation expense, with a corresponding credit to accumulated depreciation and amortization. These removal costs collected through our rates include costs attributable to legal and nonlegal removal obligations; however, the amounts collected that are in excess of these nonlegal asset-removal costs incurred are accounted for as a regulatory liability for financial reporting purposes. Historically, with the exception of the regulatory authority in Kansas, the regulatory authorities that have jurisdiction over our regulated operations have not required us to quantify or disclose this amount; rather, these costs are addressed prospectively in depreciation rates and are set in each general rate order. We have made an estimate of our regulatory liability using current rates since the last general rate order in each of our jurisdictions; however, for financial reporting purposes, significant uncertainty exists regarding the future disposition of this regulatory liability, pending, among other issues, clarification of regulatory intent. We continue to monitor the regulatory requirements, and the liability may be adjusted as more information is obtained. We record the estimated asset removal obligation in noncurrent liabilities in other deferred credits on our Balance Sheets. To the extent this estimated liability is adjusted, such amounts will be reclassified between accumulated depreciation and amortization and other deferred credits and therefore will not have an impact on earnings.

Contingencies - Our accounting for contingencies covers a variety of business activities, including contingencies for legal and environmental exposures. We accrue these contingencies when our assessments indicate that it is probable that a liability has been incurred or an asset will not be recovered and an amount can be estimated reasonably. We expense legal fees as incurred and base our legal liability estimates on currently available facts and our estimates of the ultimate outcome or resolution. Accruals for estimated losses from environmental remediation obligations generally are recognized no later than the completion of a remediation feasibility study. Recoveries of environmental remediation costs from other parties are recorded as assets when their receipt is deemed probable. Actual results may differ from our estimates resulting in an impact, positive or negative, on earnings. See Note 14 for additional information regarding contingencies.

Share-Based Payments - We expense the fair value of share-based payments net of estimated forfeitures. We estimate forfeiture rates based on historical forfeitures under our share-based payment plans.

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Prior to the separation, ONEOK charged us for compensation expense related to stock-based compensation awards granted to our employees that directly supported our operations. Share-based compensation was also a component of allocated amounts charged to us by ONEOK for general and administrative personnel providing services on our behalf.

Earnings per share - Basic EPS is based on net income and is calculated based upon the daily weighted-average number of common shares outstanding during the periods presented. Also, this calculation includes fully vested stock awards that have not yet been issued as common stock. Diluted EPS includes the above, plus unvested stock awards granted under our compensation plans, but only to the extent these instruments dilute earnings per share.

Segments - We operate in one reportable business segment: regulated public utilities that deliver natural gas to residential, commercial, industrial and transportation customers. We define reportable business segments as components of an organization for which discrete financial information is available and operating results are evaluated on a regular basis by the chief operating decision maker (CODM) in order to assess performance and allocate resources. Our CODM is our Chief Executive Officer (CEO). Characteristics of our organization that were relied upon in making this determination include the similar nature of services we provide, the functional alignment of our organizational structure, and the reports that are regularly reviewed by the CODM for the purpose of assessing performance and allocating resources. Our management is functionally aligned and centralized, with performance evaluated based upon results of the entire distribution business. Capital allocation decisions are driven by asset integrity management and operating efficiency, not geographic location.

We evaluate performance based principally on operating income. Affiliate sales are recorded on the same basis as sales to unaffiliated customers and are discussed in further detail in Note 2. Net margin is comprised of total revenues less cost of natural gas. Cost of natural gas includes commodity purchases, fuel, storage and transportation costs and does not include an allocation of general operating costs or depreciation and amortization.

In 2015 , 2014 and 2013 , we had no single external customer from which we received 10 percent or more of our gross revenues.

Treasury Stock - We record treasury stock purchases at cost, which includes incremental direct transaction costs. Amounts are recorded as reductions in equity in our Balance Sheets. We record the reissuance of treasury stock at our weighted average cost of treasury shares recorded in equity in our Balance Sheets.

Recently Issued Accounting Standards Update  - In October 2015, the FASB issued ASU 2015-17, “Balance Sheet Classification of Deferred Taxes,” to simplify reporting of deferred taxes. The new guidance requires all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. This guidance is required to be adopted for our interim and annual reports for periods beginning after December 15, 2016, but early adoption is permitted. We have adopted this guidance early to simplify our financial reporting process, have applied it prospectively for the period beginning October 1, 2015, and it did not have a material impact on our financial statements. Prior periods were not retrospectively adjusted.

In August 2015, the FASB issued ASU 2015-15, “Interest-Imputation of Interest (Subtopic 835-30),” which specifically addresses the presentation and subsequent measurement of debt issuance costs associated with line of credit arrangements. We do not expect this issued guidance, which will be adopted concurrently with ASU 2015-03, to have a material impact on our financial statements.

In April 2015, the FASB issued ASU 2015-03, “Interest-Imputation of Interest,” which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. We do not expect this issued guidance, which is required to be adopted for our interim and annual reports for periods beginning after December 15, 2015, to have a material impact on our financial statements.

In April 2015, the FASB issued ASU 2015-05, “Intangibles-Goodwill and Other-Internal-Use Software,” which helps entities evaluate the accounting for fees paid by a customer in a cloud computing arrangement. We do not expect this issued guidance, which is required to be adopted for our interim and annual reports for periods beginning after December 15, 2015, to have a material impact on our financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which clarifies and converges the revenue recognition principles under GAAP and IFRS. In July 2015, FASB delayed the effective date of ASU 2014-09 for one year. We are evaluating the impact of this recently issued guidance, which is required to be adopted for our interim and annual reports beginning with the first quarter 2018.

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2.	SEPARATION & RELATED-PARTY TRANSACTIONS	

Distribution - On January 8, 2014, ONEOK’s board of directors approved the distribution of our common stock to holders of ONEOK common stock.

In order for ONEOK to effect the distribution, we requested, and the SEC declared effective, our Registration Statement on Form 10 on January 10, 2014. ONEOK transferred all of the assets and liabilities primarily related to its natural gas distribution business to us. Assets and liabilities included accounts receivable and payable, natural gas in storage, regulatory assets and liabilities, pipeline and other natural gas distribution facilities, customer deposits, employee-related assets and liabilities, including amounts attributable to pension and other postemployment benefits, tax-related assets and liabilities and other assets and liabilities primarily associated with providing natural gas distribution service in Oklahoma, Kansas and Texas. Cash and certain corporate assets, such as office space in the corporate headquarters and certain IT hardware and software, were not transferred to us; however, a Transition Services Agreement between ONEOK and us provided access to such corporate assets as necessary to operate our business for a period of time to enable us to obtain the applicable corporate assets.

Immediately prior to the contribution of the natural gas distribution business to us, ONEOK contributed to the capital of the natural gas distribution business all of the amounts outstanding on the natural gas distribution business’ short-term note payable to and long-term line of credit with ONEOK. We received approximately $1.19 billion of cash from a private placement of senior notes, which were later exchanged for registered notes, then used a portion of those proceeds to fund a cash payment of approximately $1.13 billion to ONEOK. Effective January 31, 2014, the number of our authorized shares increased to 250 million shares of common stock and 50 million of preferred stock. On January 31, 2014, ONEOK distributed one share of our common stock for every four shares of ONEOK common stock held by ONEOK shareholders of record as of the close of business on January 21, 2014, the record date of the distribution. At the close of business on January 31, 2014, we became an independent, publicly traded company as a result of the distribution.

Reorganization Adjustments - We entered into the Separation and Distribution Agreement and several other agreements with ONEOK to effect the separation and provide a framework for our relationships with ONEOK after the distribution. These agreements govern the relationship between ONEOK and us subsequent to the completion of the distribution, and provide for the allocation among ONEOK and us of the assets, liabilities and obligations (including employee benefits and tax-related assets and liabilities) relating to the natural gas distribution business attributable to periods prior to, at and after the distribution. In accordance with the terms of the Separation and Distribution Agreement, ONEOK contributed the assets and liabilities of its natural gas distribution business to us. The noncash contributions below represent ONEOK assets and liabilities attributable to pension and other postemployment employee benefits, general corporate assets and liabilities and related deferred taxes not included previously in the ONE Gas Predecessor balance sheet, but the costs for which were included in ONE Gas Predecessor’s results of operations. The table below also includes the contribution of the short-term note payable to and long-term line of credit with ONEOK previously included in ONE Gas Predecessor balance sheets. The assets and liabilities below were recorded at historical cost as the reorganization was among entities under common control. Net transfers from ONEOK included:

	
					
(Thousands of dollars)	 	 	
Property, plant and equipment, net	 	$	21,459		
Regulatory assets, pension and other postemployment benefits	 	331,148		
Other assets	 	80,700		
Long-term line of credit with ONEOK	 	1,027,631		
Short-term note payable to ONEOK	 	397,857		
Pension and other postemployment benefits - liabilities	 	(123,800	)	
Other liabilities	 	(34,404	)	
Deferred taxes	 	(86,112	)	
Accumulated other comprehensive loss	 	(3,393	)	
Net contribution of assets (liabilities)	 	$	1,611,086		
Less: Cash paid to ONEOK	 	1,130,000		
  Net transfers from ONEOK	 	$	481,086		

Affiliate Transactions - Prior to our separation, we had certain transactions with ONEOK and its subsidiaries. We purchased a portion of our natural gas supply and natural gas transportation and storage services from ONEOK and its affiliates. These

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contracts were awarded through a competitive-bidding process, and the costs were recoverable through our purchased-gas cost adjustment mechanisms.

Prior to our separation, the Statements of Income included expense allocations for certain corporate functions historically performed by ONEOK and allocated to its natural gas distribution business, including allocations of general corporate expenses related to executive oversight, accounting, treasury, tax, legal, information technology and facilities maintenance. Where costs were incurred specifically on our behalf, the costs were billed directly to us by ONEOK. In other situations, the costs were allocated to us through a variety of methods, depending upon the nature of the expenses. For example, a service that applied equally to all employees of ONEOK was allocated based upon the number of employees in each ONEOK affiliate. An expense benefiting us but having no direct basis for allocation was allocated by the modified Distrigas method, a method using a combination of ratios that include gross plant and investment, operating income and payroll expense. It is not practicable to determine what these general overhead costs would be on a stand-alone basis. These allocations included the following costs:

Corporate Services - These represent costs for certain employees of ONEOK who provided general and administrative services on our behalf. These charges were either directly identifiable or allocated based upon usage factors for our operations. In addition, we received other allocated costs for our share of general corporate expenses of ONEOK, which were determined based on our relative use of the service or, if there was no direct basis for allocation, were allocated by the modified Distrigas method. All of these costs are reflected in operations and maintenance and depreciation expense in the Statements of Income.

Benefit Plans and Incentives - These represent benefit costs and other incentives, including group health and welfare benefits, pension plans, other postemployment benefit plans and employee stock-based compensation plans. Costs associated with incentive and stock-based compensation plans were determined on a specific identification basis for certain employees who directly supported our operations. All other employee benefit costs historically were allocated using a percentage factor derived from a ratio of benefit costs to salary costs for ONEOK’s employees. These expenses are included in operations and maintenance expenses in the Statements of Income.

Total compensation cost, which included costs for both employees who directly supported our operations and allocations for corporate services, charged to us by ONEOK related to share-based payment plans was $15.5 million during 2013. Compensation costs charged to us by ONEOK in 2014 were not material. See Note 11 for additional information regarding share-based payments. Total cost charged to us by ONEOK related to pension and other postemployment health and welfare plans was $52.1 million during 2013, which is net of amounts deferred through regulatory mechanisms of $1.8 million during 2013. Cost related to pension and other postemployment health and welfare plans which was charged to us by ONEOK in 2014 was not material. See Note 12 for additional information regarding employee benefit plans.

Interest Expense - ONEOK utilized a centralized approach to cash management and the financing of its businesses. Cash receipts and cash expenditures for costs and expenses from our operations were transferred to or from ONEOK on a regular basis and recorded as increases or decreases in the balance due in short-term note payable to ONEOK under an unsecured promissory note we had in place with ONEOK. The amounts outstanding under the long-term line of credit with ONEOK and the short-term note payable to ONEOK accrued interest based on ONEOK’s weighted-average cost of long-term and short-term debt, respectively.

The weighted average interest rate on amounts outstanding under the long-term line of credit with ONEOK was 5.79 percent in 2013. The interest rate on the revolver was reset each year based on ONEOK’s outstanding debt plus an adjustment of 50 basis points for ONEOK’s cost to administer the program.

The weighted-average interest rate for the short-term notes payable to ONEOK was 0.92 percent for 2013. Principal under these notes payable beared interest based on ONEOK’s weighted-average cost of short-term debt, plus a utilization fee of 50 basis points, calculated monthly.

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The following table shows ONEOK’s and its subsidiaries’ transactions with us included in the Statements of Income for the periods indicated:

					
 	 	Year Ended December 31,	
 	 	2013	
 	 	(Thousands of dollars)	
Cost of natural gas	 	$	226,582		
Operations and maintenance	 	 		
Direct employee labor and benefit costs	 	177,526		
Allocated employee labor and benefit costs	 	29,955		
Charges for general and administrative services	 	36,078		
Depreciation and amortization	 	6,940		
Other (income)/expense, net	 	(5,073	)	
Interest expense	 	60,930		
Total	 	$	532,938		

Employee labor and benefit costs capitalized totaled $49.3 million for 2013. In addition, we recorded regulated utility revenue from ONEOK and its subsidiaries. This amount was immaterial for the period presented.

The remaining related party transactions prior to the separation were not material in 2014.

3.	CREDIT FACILITY AND SHORT-TERM NOTES PAYABLE	

ONE Gas Credit Agreement - The ONE Gas Credit Agreement contains certain financial, operational and legal covenants. Among other things, these covenants include maintaining ONE Gas’ total debt-to-capital ratio of no more than 70 percent at the end of any calendar quarter. The ONE Gas Credit Agreement also contains customary affirmative and negative covenants, including covenants relating to liens, indebtedness of subsidiaries, investments, changes in the nature of business, fundamental changes, transactions with affiliates, burdensome agreements, and use of proceeds. In the event of a breach of certain covenants by ONE Gas, amounts outstanding under the ONE Gas Credit Agreement may become due and payable immediately. At December 31, 2015 , our total debt-to-capital ratio was 40 percent and we were in compliance with all covenants under the ONE Gas Credit Agreement.

The ONE Gas Credit Agreement includes a $50 million sublimit for the issuance of standby letters of credit and also features an option to request an increase in the size of the facility to an aggregate of $1.2 billion from $700 million by either commitments from new lenders or increased commitments from existing lenders. Borrowings made under the facility are available for general corporate purposes. The ONE Gas Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit rating. Based on our current credit ratings, borrowings, if any, will accrue interest at LIBOR plus 79.5 basis points, and the annual facility fee is 8 basis points.

We have a commercial paper program under which we may issue unsecured commercial paper up to a maximum amount of $700 million to fund short-term borrowing needs. The maturities of the commercial paper notes may vary but may not exceed 270 days from the date of issue. The commercial paper notes are sold generally at par less a discount representing an interest factor.

The ONE Gas Credit Agreement is available to repay the commercial paper notes, if necessary. Amounts outstanding under the commercial paper program reduce the borrowing capacity under the ONE Gas Credit Agreement. At December 31, 2015, we had $12.5 million of commercial paper and $1.0 million in letters of credit issued under the ONE Gas Credit Agreement, with no borrowings and $686.5 million of remaining credit available under the ONE Gas Credit Agreement. The weighted-average interest rate on our commercial paper was 0.70 percent and 0.32 percent at December 31, 2015 and 2014, respectively.

4.	LONG-TERM DEBT	

Senior notes issuance - In January 2014, we issued senior notes, consisting of $300 million of 2.07 percent senior notes due 2019 , $300 million of 3.61 percent senior notes due 2024 and $600 million of 4.658 percent senior notes due 2044 (collectively, our “Senior Notes”). The net proceeds were approximately $1.19 billion and were used to fund a one-time cash

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payment to ONEOK of approximately $1.13 billion as part of the separation. The remaining portion of the net proceeds was retained in order to provide sufficient financial flexibility and to support working capital requirements and capital expenditures.

The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in the aggregate principal amount of the outstanding Senior Notes to declare those senior notes immediately due and payable in full.

We may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months, and six months, respectively, before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date. Our Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

5.	EQUITY	

Preferred Stock - At December 31, 2015, we have 50 million , $0.01 par value, authorized shares of preferred stock available. We have not issued or established any classes or series of shares of preferred stock.

Common Stock - At December 31, 2015 , we had approximately 197.4 million shares of authorized common stock available for issuance.

Treasury Shares - We purchase treasury shares to be used to offset shares issued under our employee and non-employee director equity compensation and employee stock purchase plans. Our Board of Directors established an annual limit of $20 million of treasury stock purchases, exclusive of funds received through the dividend reinvestment and employee stock purchase plans. Stock purchases may be made in the open market or in private transactions at times, and in amounts that we deem appropriate. There is no guarantee as to the exact number of shares that we purchase, and we can terminate or limit the program at any time. We hold the purchased shares as treasury shares and account for them using the cost method.

Dividends Declared - In January 2016, a dividend of $0.35 per share ( $1.40 per share on an annualized basis) was declared for shareholders of record on February 26, 2016, payable March 11, 2016.

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6.	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	

The following table sets forth the balance in accumulated other comprehensive income (loss) for the period indicated:

					
 	 	Accumulated Other Comprehensive Income (Loss)	
 	 	(Thousands of dollars)	
January 1, 2014	 	$	—		
Transfers in upon separation	 	(3,393	)	
Pension and other postemployment benefit plans obligations	 	 	
Other comprehensive income (loss) before reclassification, net of tax of $1,442	 	(2,096	)	
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(198)	 	315		
Other comprehensive income (loss)	 	(1,781	)	
December 31, 2014	 	(5,174	)	
Pension and other postemployment benefit plans obligations	 	 	
Other comprehensive income (loss) before reclassification, net of tax of $(130)	 	209		
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(353)	 	564		
Other comprehensive income (loss)	 	773		
December 31, 2015	 	$	(4,401	)	

The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) on our Statements of Income for the period indicated:

										
Details about Accumulated Other Comprehensive Income	 	Year Ended December 31,	Affected Line Item in the	
(Loss) Components	 	2015	 	2014	Statements of Income	
 	 	( Thousands of dollars )	 	
Pension and other postemployment benefit plan obligations (a)	 	 	 	 	 	
Amortization of net loss
	 	$	47,494		 	$	34,169		 	
Amortization of unrecognized prior service cost	 	(1,962	)	 	(1,211	)	 	
 	 	45,532		 	32,958		 	
Regulatory adjustments (b)	 	(44,615	)	 	(32,445	)	 	
 	 	917		 	513		Income before income taxes	
 	 	(353	)	 	(198	)	Income tax expense	
Total reclassifications for the period	 	$	564		 	$	315		Net income	
(a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note 12 for additional information regarding our net periodic benefit cost.
(b) Regulatory adjustments represent pension and other postemployment benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets. See Note 9 for additional information regarding our regulatory assets and liabilities.

7.	EARNINGS PER SHARE	

The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:

											
 	Year Ended December 31, 2015	
 	Income	 	Shares	 	Per Share
Amount	
 	( Thousands, except per share amounts )	
Basic EPS Calculation	 	 	 	 	 	
Net income available for common stock	$	119,030		 	52,578		 	$	2.26		
Diluted EPS Calculation	 		 	 		 	 		
Effect of dilutive securities	—		 	676		 	 		
Net income available for common stock and common stock equivalents	$	119,030		 	53,254		 	$	2.24		

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 	Year Ended December 31, 2014	
 	Income	 	Shares	 	Per Share
Amount	
 	( Thousands, except per share amounts )	
Basic EPS Calculation	 	 	 	 	 	
Net income available for common stock	$	109,790		 	52,364		 	$	2.10		
Diluted EPS Calculation	 	 	 		 	 		
Effect of dilutive securities	—		 	582		 	 		
Net income available for common stock and common stock equivalents	$	109,790		 	52,946		 	$	2.07		

	
											
 	Year Ended December 31, 2013	
 	Income	 	Shares	 	Per Share
Amount	
 	( Thousands, except per share amounts )	
Basic EPS Calculation	 	 	 	 	 	
Net income available for common stock	$	99,195		 	52,319		 	$	1.90		
Diluted EPS Calculation	 		 	 		 	 		
Effect of dilutive securities	—		 	—		 	 		
Net income available for common stock and common stock equivalents	$	99,195		 	52,319		 	$	1.90		

On January 31, 2014,  51,941,236  shares of our common stock were distributed to ONEOK shareholders in conjunction with the separation. For comparative purposes, and to provide a more meaningful calculation of weighted-average shares outstanding, we have assumed this amount and any shares associated with fully vested stock awards that have not been issued to be outstanding as of the beginning of each period prior to the separation presented in the calculation of weighted-average shares.

8.	DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS	

Derivative Instruments -   At December 31, 2015 , we held purchased natural gas call options for the heating season ending March 2016, with total notional amounts of 17.0 Bcf, for which we paid premiums of $5.8 million , and had a fair value of $0.4 million . At December 31, 2014 , we held purchased natural gas call options for the heating season ended March 2015, with total notional amounts of 16.0 Bcf, for which we paid premiums of $6.4 million , and had a fair value of $0.1 million . The premiums paid and any cash settlements received are recorded as part of our unrecovered purchased-gas costs in current regulatory assets as these contracts are included in, and recoverable through, the purchased-gas cost adjustment mechanisms. Additionally, changes in fair value associated with these contracts are deferred as part of our unrecovered purchased-gas costs in our Balance Sheets. Our natural gas call options are classified as Level 1 as fair value amounts are based on unadjusted quoted prices in active markets including NYMEX-settled prices. There were no transfers between levels for the periods presented.

Other Financial Instruments -   The approximate fair value of cash and cash equivalents, accounts receivable and accounts payable is equal to book value, due to the short-term nature of these items. Our cash and cash equivalents are comprised of bank and money market accounts, and are classified as Level 1.

Short-term notes payable and commercial paper are due upon demand and, therefore, the carrying amounts approximate fair value and are classified as Level 1. The book value of our long-term debt, including current maturities, was  $1.2 billion  at both December 31, 2015 and 2014 . The estimated fair value of our long-term debt, including current maturities, was  $1.2 billion  and  $1.3 billion  at December 31, 2015 and 2014 , respectively. The estimated fair value of our Senior Notes was determined using quoted market prices, and are considered Level 2.

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9.	REGULATORY ASSETS AND LIABILITIES	

The table below presents a summary of regulatory assets, net of amortization, and liabilities for the periods indicated:

															
 	 	 	 	December 31, 2015	
 	 	Remaining Recovery Period	 	Current	 	Noncurrent	 	Total	
 	 	 	 	( Thousands of dollars )	
Under-recovered purchased-gas costs	 	1 year	 	$	13,336		 	$	—		 	$	13,336		
Pension and other postemployment benefit costs	 	See Note 12	 	15,670		 	425,175		 	440,845		
Weather normalization	 	1 year	 	2,198		 	—		 	2,198		
Reacquired debt costs	 	12 years	 	812		 	8,919		 	9,731		
Other	 	1 to 23 years	 	909		 	1,769		 	2,678		
Total regulatory assets, net of amortization	 	 	 	32,925		 	435,863		 	468,788		
Accumulated removal costs (a)	 	up to 50 years	 	—		 	(9,032	)	 	(9,032	)	
Over-recovered purchased-gas costs	 	1 year	 	(22,884	)	 	—		 	(22,884	)	
Ad valorem tax	 	1 year	 	(1,731	)	 	—		 	(1,731	)	
Total regulatory liabilities	 	 	 	(24,615	)	 	(9,032	)	 	(33,647	)	
Net regulatory assets and liabilities	 	 	 	$	8,310		 	$	426,831		 	$	435,141		
(a) Included in other deferred credits in our Balance Sheets.

															
 	 	 	 	December 31, 2014	
 	 	Remaining Recovery Period	 	Current	 	Noncurrent	 	Total	
 	 	 	 	( Thousands of dollars )	
Under-recovered purchased-gas costs	 	1 year	 	$	28,712		 	$	—		 	$	28,712		
Pension and other postemployment benefit costs	 	See Note 12	 	18,108		 	466,684		 	484,792		
Reacquired debt costs	 	13 years	 	812		 	9,730		 	10,542		
Other	 	1 to 24 years	 	2,561		 	2,309		 	4,870		
Total regulatory assets, net of amortization	 	 	 	50,193		 	478,723		 	528,916		
Accumulated removal costs (a)	 	up to 50 years	 	—		 	(15,451	)	 	(15,451	)	
Weather normalization	 	1 year	 	(16,516	)	 	—		 	(16,516	)	
Over-recovered purchased-gas costs	 	1 year	 	(13,055	)	 	—		 	(13,055	)	
Ad valorem tax	 	1 year	 	(2,896	)	 	—		 	(2,896	)	
Total regulatory liabilities	 	 	 	(32,467	)	 	(15,451	)	 	(47,918	)	
Net regulatory assets and liabilities	 	 	 	$	17,726		 	$	463,272		 	$	480,998		
(a) Included in other deferred credits in our Balance Sheets.

Regulatory assets on our Balance Sheets, as authorized by the various regulatory authorities, are probable of recovery. Base rates are designed to provide a recovery of cost during the period rates are in effect but do not generally provide for a return on investment for amounts we have deferred as regulatory assets. All of our regulatory assets recoverable through base rates are subject to review by the respective regulatory authorities during future rate proceedings. We are not aware of any evidence that these costs will not be recoverable through either rate riders or base rates, and we believe that we will be able to recover such costs, consistent with our historical recoveries.

Purchased-gas costs represent the natural gas costs that have been over- or under-recovered from customers through the purchased-gas cost adjustment mechanisms, and includes natural gas utilized in our operations and premiums paid and any cash settlements received from our purchased natural gas call options.

We amortize reacquired debt costs in accordance with the accounting guidelines prescribed by the OCC and KCC.

In December 2013, the KCC approved a settlement agreement between ONEOK, the staff of the KCC, and the Citizens’ Utility Ratepayer Board that authorized the transfer of ONEOK’s Kansas Gas Service natural gas distribution assets to us. As a result, Kansas Gas Service expensed certain transition costs associated with ONEOK’s acquisition of Kansas Gas Service in 1997 that previously had been recorded as a regulatory asset and amortized and recovered in rates over a 40-year period. As such, we recorded a noncash charge to income of approximately $10.2 million before taxes during 2013 in depreciation and amortization.

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Weather normalization represents revenue over- or under-recovered through the weather normalization adjustment rider in Kansas. This amount is deferred as a regulatory asset or liability for a 12-month period. Kansas Gas Service then applies an adjustment to the customers’ bills for 12 months to refund the over-collected revenue or bill the under-collected revenue.

Ad valorem tax represents an increase or decrease in Kansas Gas Service’s taxes above or below the amount approved in a rate case. This amount is deferred as a regulatory asset or liability for a 12-month period. Kansas Gas Service then applies an adjustment to the customers’ bills for 12 months to refund the over-collected revenue or bill the under-collected revenue.

Recovery through rates resulted in amortization of regulatory assets of approximately $1.6 million and $6.4 million for the years ended December 31, 2015 and 2014 , respectively. Amortization of regulatory assets of approximately $32.0 million for the year ended December 31, 2013 , included amounts recovered through rates totaling $21.8 million and $10.2 million related to certain transition costs as described above.

We collect, through our rates, the estimated costs of removal on certain regulated properties through depreciation expense, with a corresponding credit to accumulated depreciation and amortization. These removal costs are nonlegal obligations; however, the amounts collected that are in excess of these nonlegal asset-removal costs incurred are accounted for as a regulatory liability. We have made an estimate of our regulatory liability using current rates since the last general rate order in each of our jurisdictions. We record the estimated nonlegal asset removal obligation in noncurrent liabilities in other deferred credits on our Balance Sheets.

In January 2016, as a result of our rate case in Oklahoma, we recorded a regulatory asset of $2.4 million to recover certain information technology costs incurred as a result of our separation from ONEOK in 2014, which will be recovered over four years.

10.	PROPERTY, PLANT AND EQUIPMENT	

The following table sets forth our property, plant and equipment by property type, for the periods indicated:

									
 	 	December 31,	 	December 31,	
 	 	2015	 	2014	
 	 	( Thousands of dollars )	
Natural gas distribution pipelines and related equipment	 	$	4,114,090		 	$	3,909,881		
Natural gas transmission pipelines and related equipment	 	462,654		 	450,810		
General plant and other	 	498,906		 	418,157		
Construction work in process	 	57,032		 	71,353		
Property, plant and equipment	 	5,132,682		 	4,850,201		
Accumulated depreciation and amortization	 	(1,620,771	)	 	(1,556,481	)	
Net property, plant and equipment	 	$	3,511,911		 	$	3,293,720		

We compute depreciation expense for distribution operations by applying composite, straight-line rates approved by various regulatory authorities. The average depreciation rates for our property are set forth in the following table for the periods indicated:

					
Years Ended December 31,	
2015	 	2014	 	2013	
2.0% - 3.0%	 	2.0% - 3.0%	 	2.0% - 3.0%	

We recorded capitalized interest of $2.6 million , $2.5 million and $1.3 million for the years ended December 31, 2015, 2014 and 2013 , respectively. We incurred liabilities for construction work in process that had not been paid at December 31, 2015, 2014 and 2013 of $15.0 million , $7.0 million and $10.5 million , respectively. Such amounts are not included in capital expenditures on the Statements of Cash Flows.

Amounts recorded for regulatory accounting purposes that were not reflected in our financial statements were not material for the years ended December 31, 2015 and 2014.

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11.	SHARE-BASED PAYMENTS	

The ONE Gas Equity Compensation Plan (ECP or ONE Gas Plan) provides for the granting of stock-based compensation, including incentive stock options, nonstatutory stock options, stock bonus awards, restricted stock awards, restricted stock unit awards, performance stock awards and performance unit awards to eligible employees and the granting of stock awards to nonemployee directors. We have reserved 2.8 million shares of common stock for issuance under the ECP. At December 31, 2015 , we had approximately 1.4 million shares available for issuance under the ECP, which reflect shares issued and estimated shares expected to be issued upon vesting of outstanding awards granted under the plan, less forfeitures. The plan allows for the deferral of awards granted in stock or cash, in accordance with Internal Revenue Code section 409A requirements.

Prior to our separation, certain employees assigned to us in the separation participated in ONEOK’s share-based awards plans (ONEOK Plans). The ONEOK Plans provided for ONEOK common stock based awards to both employees and ONEOK’s nonemployee directors. The plans permitted the granting of various types of awards including, but not limited to, performance stock units and restricted stock units. Awards could be granted for no consideration other than prior and future services or based on certain financial performance targets. In connection with the separation, awards granted by ONEOK in 2012 and 2013 were cancelled and replaced with awards of ONE Gas shares. The number of restricted stock units held by a ONE Gas participant was multiplied by a ratio of 2.04 which was determined by the ONEOK volume-weighted average share price of $68.22 on January 31, 2014, and the ONE Gas volume-weighted average share price of $33.50 on February 3, 2014, rounded to the nearest whole share.

The same ratio of 2.04 was used to convert the outstanding performance stock units awarded by ONEOK prior to the separation into awards for ONE Gas shares. A pre-distribution payout factor was applied to each grant based on ONEOK’s total shareholder return performance compared with its peer group for the number of days lapsed from the date of the grant to January 31, 2014, and these awards were frozen or “banked” and are not subject to an additional payout factor. The remaining units from each grant will continue to be at-risk based on our performance and the relative total shareholder return of our peer group.

No incremental cost was recorded in our financial statements upon cancellation and replacement of the 2012 and 2013 restricted stock units and performance stock units because the previous awards were cancelled and replaced pursuant to anti-dilution provisions of the ONEOK Plans and the fair value of the awards immediately following the cancellation and replacement was not higher than the fair value of the awards immediately before the cancellation and replacement.

We were charged by ONEOK for share-based compensation expense related to employees that directly supported our operations. ONEOK also charged us for the allocated costs of certain employees of ONEOK (including stock-based compensation) who provided general and administrative services on our behalf. Information included in this note is limited to share-based compensation associated with employees in 2014, and employees that directly supported our operations as part of ONEOK prior to our separation. See Note 2 for total costs charged to us by ONEOK.

Compensation cost expensed for our share-based payment plans was $5.7 million , net of tax benefits of $3.5 million , for 2015, and $7.0 million , net of tax benefits of $4.4 million for 2014. Compensation cost charged to us for employees directly supporting our operations by ONEOK for 2013 totaled $9.7 million , respectively, which is net of $6.1 million of tax benefits.

Restricted Stock Unit Awards - We have granted restricted stock unit awards to key employees that vest over a service period of generally three years and entitle the grantee to receive shares of our common stock. The awards granted that replaced awards granted by ONEOK in 2012 vested, and 2013 will vest, consistent with their original vesting dates in 2015 and 2016, respectively. Restricted stock unit awards granted in 2015 and 2014 and that replaced awards granted by ONEOK in 2013 accrue dividend equivalents in the form of additional restricted stock units prior to vesting. Restricted stock unit awards are measured at fair value as if they were vested and issued on the grant date, reduced by expected dividend payments for awards that do not accrue dividends and adjusted for estimated forfeitures. Compensation expense is recognized on a straight-line basis over the vesting period of the award. A forfeiture rate of 3 percent per year based on historical forfeitures under our share-based payment plans is used.

Performance Stock Unit Awards - We have granted performance stock unit awards to key employees. The shares of common stock underlying the performance stock units vest at the expiration of a service period of generally three years if certain performance criteria are met by us as determined by the Executive Compensation Committee of the Board of Directors. The awards granted that replaced awards granted by ONEOK in 2012 vested, and 2013 will vest, consistent with their original vesting dates in 2015 and 2016, respectively, if certain performance criteria are met by us for the at-risk portion of the awards as described above. Upon vesting, a holder of performance stock units is entitled to receive a number of shares of common

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stock equal to a percentage (0 percent to 200 percent) of the performance stock units granted, based on our total shareholder return over the vesting period, compared with the total shareholder return of a peer group of other utilities over the same period.

If paid, the outstanding performance stock unit awards entitle the grantee to receive shares of our common stock. The outstanding performance stock unit awards are equity awards with a market-based condition, which results in the compensation expense for these awards being recognized on a straight-line basis over the requisite service period, provided that the requisite service period is fulfilled, regardless of when, if ever, the market condition is satisfied. The new performance stock unit awards granted in 2015 and 2014 and the grants that replaced awards granted by ONEOK in 2013 accrue dividend equivalents in the form of additional performance stock units prior to vesting. The fair value of these performance stock units was estimated on the grant date based on a Monte Carlo model. The compensation expense on these awards will only be adjusted for changes in forfeitures. A forfeiture rate of 3 percent per year based on historical forfeitures under our and, prior to the separation, ONEOK’s share-based payment plans was used.

Restricted Stock Unit Award Activity

As of December 31, 2015 , there was $3.2 million of total unrecognized compensation costs related to the nonvested restricted stock unit awards, which is expected to be recognized over a weighted-average period of 1.8 years. The following tables set forth activity and various statistics for restricted stock unit awards outstanding under the respective plans for the period indicated:

								
 	 	Number of
Shares	 	Weighted-
Average Price	
Nonvested December 31, 2014	 	325,730		 	$	23.47		
Granted	 	75,880		 	$	41.40		
Vested	 	(162,280	)	 	$	18.32		
Forfeited	 	(8,072	)	 	$	34.42		
Nonvested December 31, 2015	 	231,258		 	$	32.59		

													
 	 	2015	 	2014	 	2013	
Weighted-average grant date fair value (per share)	 	$	41.40		 	$	33.19		 	$	47.36		
Fair value of shares granted (thousands of dollars)	 	$	3,141		 	$	3,149		 	$	1,323		

Performance Stock Unit Award Activity

As of December 31, 2015 , there was $4.7 million of total unrecognized compensation cost related to the nonvested performance stock unit awards, which is expected to be recognized over a weighted-average period of 1.7 years. The following tables set forth activity and various statistics related to our performance stock unit awards and the assumptions used by us, and ONEOK prior to 2014, in the valuations of the 2015, 2014 and 2013 grants at the grant date:

								
 	 	Number of
Units	 	Weighted-
Average Price	
Nonvested December 31, 2014	 	847,951		 	$	17.62		
Granted	 	100,860		 	$	44.48		
Vested	 	(502,474	)	 	$	14.33		
Forfeited	 	(7,087	)	 	$	30.22		
Nonvested December 31, 2015	 	439,250		 	$	27.35		

								
 	 	2015	 	2014	 	2013	 	
Volatility	 	15.90%	(a)	18.40%	(a)	22.27%	(b)	
Dividend yield	 	2.90%	 	3.37%	 	3.04%	 	
Risk-free interest rate	 	1.10%	 	0.67%	 	0.42%	 	
(a) - Volatility based on historical volatility over three years using daily stock price observations of our peer utilities.	 	
(b) - Volatility based on historical volatility over three years using daily ONEOK stock price observations.	 	

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 	 	2015	 	2014	 	2013	
Weighted-average grant date fair value (per share)	 	$	44.48		 	$	35.98		 	$	52.30		
Fair value of shares granted (thousands of dollars)	 	$	4,486		 	$	4,462		 	$	2,926		

Employee Stock Purchase Plan

We have reserved a total of 0.7 million  shares of common stock for issuance under our Employee Stock Purchase Plan (the ESPP).  Subject to certain exclusions, all employees who work at least 20 hours per week are eligible to participate in the ESPP.  Employees can choose to have up to 10 percent of their annual base pay withheld to purchase our common stock, subject to terms and limitations of the plan. The purchase price of the stock is 85 percent of the lower of the average market price of our common stock on the grant date or exercise date. Approximately 40 percent and 36 percent of employees participated in the plan in 2015 and 2014, respectively, and purchased 51,092 shares at $36.15 in 2015 and 51,418 shares at $32.29 in 2014. Compensation expense, before taxes, was $1.3 million  and $0.4 million in 2015 and 2014, respectively. All eligible employees of ONEOK were eligible to participate in a similar ESPP plan, but enrollment of our employees in that plan was terminated upon the separation. Compensation expense, before tax, charged to us by ONEOK for employees who directly supported our operations was $2.7 million for 2013.

Employee Stock Award Program

Under the program, each time the per-share closing price of our common stock on the NYSE closed for the first time at or above each $1.00 increment above its previous historical high closing price, we issued, for no monetary consideration, one share of our common stock to all eligible employees. The total number of shares of our common stock authorized for issuance under this program is 125,000 . Shares issued to employees under this program during 2015 and 2014 totaled 23,506 and 35,324 , and compensation expense, before taxes, related to the Employee Stock Award Program was $1.1 million and $2.5 million for 2015 and 2014, respectively. Compensation expense, before taxes, charged to us by ONEOK related to a similar program to ours that was administered by ONEOK for employees who directly supported our operations was $4.2 million for 2013.

12.	EMPLOYEE BENEFIT PLANS	

Retirement and Other Postemployment Benefit Plans

Prior to separation, certain employees participated in the Plans sponsored by ONEOK. We accounted for the Plans as multiemployer benefit plans. These defined benefit pension and other postemployment benefit costs included amounts associated with vested participants who are no longer employees. As described in Note 2, prior to 2014, ONEOK also charged us for the allocated cost of certain employees of ONEOK who provided general and administrative services on our behalf. ONEOK included an allocation of the benefit costs associated with these ONEOK employees based upon its allocation methodology, not necessarily specific to the employees providing general and administrative services on our behalf.

Retirement Plans - We have a defined benefit pension plan covering nonbargaining-unit employees hired before January 1, 2005, and certain bargaining-unit employees hired before December 15, 2011. Nonbargaining unit employees hired after December 31, 2004; employees represented by Local No. 304 of the International Brotherhood of Electrical Workers (IBEW) hired on or after July 1, 2010; employees represented by the United Steelworkers hired on or after December 15, 2011; and employees who accepted a one-time opportunity to opt out of the defined benefit pension plan are covered by a profit-sharing plan. Certain employees of the Texas Gas Services division were entitled to benefits under a frozen cash-balance pension plan. In addition, we have a supplemental executive retirement plan for the benefit of certain officers. No new participants in the supplemental executive retirement plan have been approved since 2005, and it was formally closed to new participants as of January 1, 2014. We fund our defined benefit pension costs at a level needed to maintain or exceed the minimum funding levels required by the Employee Retirement Income Security Act of 1974, as amended, and the Pension Protection Act of 2006. Pension expense was $38.0 million and $27.1 million in 2015 and 2014, respectively, prior to regulatory deferrals. Pension expense charged to us by ONEOK for employees directly supporting our operations totaled $35.0 million for 2013, prior to regulatory deferrals.

Other Postemployment Benefit Plans - We sponsor health and welfare plans that provide postemployment medical and life insurance benefits to certain employees who retire with at least five years of service. The postemployment medical plan is contributory based on hire date, age and years of service, with retiree contributions adjusted periodically, and contains other cost-sharing features such as deductibles and coinsurance. Other postemployment benefit expense was $5.0 million and $5.9

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million in 2015 and 2014, respectively, prior to regulatory deferrals. Other postemployment benefit expense charged to us by ONEOK for employees directly supporting our operations totaled $12.3 million for 2013, prior to regulatory deferrals.

Plan Amendments - In October 2015, plan amendments were approved to merge our frozen cash-balance defined benefit pension plan covering certain Texas Gas Service employees with our defined benefit pension plan covering certain eligible employees. In addition, we announced to eligible pre-65 participants in our postemployment medical plans a change from a self-insured postemployment medical plan to a plan providing participants an annual benefit that will allow them to select coverage on a healthcare exchange. As a result, we remeasured the respective plan assets and benefit obligations, effective October 1, 2015, which resulted in a reduction in benefit obligations of our postemployment benefit plan of $11.9 million . Net periodic benefit cost for the plans in 2015 was reduced by $3.4 million .

Actuarial Assumptions - The following table sets forth the weighted-average assumptions used to determine benefit obligations for pension and postemployment benefits for the periods indicated:

					
 	 	December 31,	
 	 	2015	 	2014	
Discount rate	 	4.75%	 	4.25%	
Compensation increase rate	 	3.35% - 3.40%	 	3.30% - 3.50%	

The following table sets forth the weighted-average assumptions used by us, and ONEOK prior to 2014, to determine the periodic benefit costs for the periods indicated:

									
 	 	Nine Months Ended September 30,	 	Three Months Ended December 31,	 	Years Ended December 31,	
 	 	2015	 	2015	 	2014	 	2013	
Discount rate - pension plans	 	4.25%	 	4.75%	 	5.25%	 	4.25%	
Discount rate - other postemployment plans	 	4.25%	 	4.75%	 	5.00%	 	4.00%	
Expected long-term return on plan assets	 	7.75%	 	7.75%	 	7.75%	 	8.25%	
Compensation increase rate	 	3.30% - 3.50%	 	3.30% - 3.50%	 	3.35% - 3.50%	 	3.45% - 3.50%	

We determine our overall expected long-term rate of return on plan assets, based on our review of historical returns and economic growth models. At December 31, 2014, we updated our assumed mortality rates to incorporate the new set of mortality tables issued by the Society of Actuaries in October 2014.

We determine our discount rates annually.  We estimate our discount rate based upon a comparison of the expected cash flows associated with our future payments under our defined benefit pension and other postemployment obligations to a hypothetical bond portfolio created using high-quality bonds that closely match expected cash flows.  Bond portfolios are developed by selecting a bond for each of the next 60 years based on the maturity dates of the bonds.  Bonds selected to be included in the portfolios are only those rated by Moody’s as AA- or better and exclude callable bonds, bonds with less than a minimum issue size, yield outliers and other filtering criteria to remove unsuitable bonds.

Regulatory Treatment - The OCC, KCC and regulatory authorities in Texas have approved the recovery of pension costs and other postemployment benefits costs through rates for Oklahoma Natural Gas, Kansas Gas Service and Texas Gas Service, respectively. The costs recovered through rates are based on current funding requirements and the net periodic benefit cost for defined benefit pension and other postemployment costs. Differences, if any, between the expense and the amount recovered through rates would be reflected in earnings, net of authorized deferrals.

We historically have recovered defined benefit pension and other postemployment benefit costs through rates. We believe it is probable that regulators will continue to include the net periodic pension and other postemployment benefit costs in our cost of service.

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Obligations and Funded Status - In connection with the separation from ONEOK, we entered into an Employee Matters Agreement with ONEOK, which provides that our employees no longer participate in benefit plans sponsored or maintained by ONEOK as of the separation date. Effective January 1, 2014, the ONEOK defined benefit pension plans and other postemployment benefit plans transferred assets and obligations related to those employees transferring to ONE Gas and vested participants who are no longer employees to the new ONE Gas plans. As a result, we recorded sponsored pension and other postemployment plan obligations of approximately $1.1 billion , and sponsored defined benefit pension and other postemployment plan assets of approximately $1.0 billion , which are reflected below as our balances at the beginning of the period. Additionally, as a result of the transfer of unrecognized losses from ONEOK, our regulatory assets and deferred income taxes increased $331 million and $86 million , respectively.

The following table sets forth our defined benefit pension and other postemployment benefit plans, benefit obligations and fair value of plan assets for the periods indicated:

	
																
 	Pension Benefits	 	Other Postemployment Benefits	
 	December 31,	 	December 31,	
 	2015	 	2014	 	2015	 	2014	
Changes in Benefit Obligation	(Thousands of dollars)	 	 	
Benefit obligation, beginning of period	$	1,028,171		 	$	863,620		 	$	257,688		 	$	239,171		
Service cost	13,660		 	11,620		 	3,257		 	3,468		
Interest cost	43,542		 	43,791		 	10,628		 	11,605		
Plan participants’ contributions	—		 	—		 	2,915		 	2,642		
Actuarial loss (gain)	(47,607	)	 	159,275		 	(19,702	)	 	14,998		
Benefits paid	(52,142	)	 	(50,135	)	 	(14,632	)	 	(14,196	)	
Plan amendment	—		 	—		 	(11,901	)	 	—		
   Benefit obligation, end of period	985,624		 	1,028,171		 	228,253		 	257,688		
 	 	 	 	 	 	 	 	
Change in Plan Assets	 	 	 	 	 	 	 	
Fair value of plan assets, beginning of period	845,396		 	840,699		 	151,777		 	147,237		
Actual return on plan assets	(9,026	)	 	53,907		 	1,335		 	6,912		
Employer contributions	933		 	925		 	14,100		 	9,182		
Plan participants’ contributions	—		 	—		 	2,915		 	2,642		
Benefits paid	(52,142	)	 	(50,135	)	 	(14,632	)	 	(14,196	)	
   Fair value of assets, end of period	785,161		 	845,396		 	155,495		 	151,777		
   Balance at December 31	$	(200,463	)	 	$	(182,775	)	 	$	(72,758	)	 	$	(105,911	)	
 	 	 	 	 	 	 	 	
Current liabilities	$	(912	)	 	$	(907	)	 	$	—		 	$	—		
Noncurrent liabilities	(199,551	)	 	(181,868	)	 	(72,758	)	 	(105,911	)	
   Balance at December 31	$	(200,463	)	 	$	(182,775	)	 	$	(72,758	)	 	$	(105,911	)	

The accumulated benefit obligation for our defined benefit pension plans was $934.3 million and $970.7 million at December 31, 2015 and 2014, respectively.

There are no plan assets expected to be withdrawn and returned to us in 2016.

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Components of Net Periodic Benefit Cost - The following table sets forth the components of net periodic benefit cost for our defined benefit pension and other postemployment benefit plans for the period indicated:

	
								
 	Pension Benefits	
 	Year Ended December 31,	
 	2015	 	2014	
 	(Thousands of dollars)	
Components of net periodic benefit cost	 	 	 	
Service cost	$	13,660		 	$	11,620		
Interest cost	43,542		 	43,791		
Expected return on assets	(61,769	)	 	(59,862	)	
Amortization of unrecognized prior service cost	266		 	549		
Amortization of net loss	42,226		 	30,200		
Settlements	27		 	773		
   Net periodic benefit cost	$	37,952		 	$	27,071		

	
								
 	Other Postemployment Benefits	
 	Year Ended December 31,	
 	2015	 	2014	
 	(Thousands of dollars)	
Components of net periodic benefit cost	 	 	 	
Service cost	$	3,257		 	$	3,468		
Interest cost	10,628		 	11,605		
Expected return on assets	(11,892	)	 	(11,393	)	
Amortization of unrecognized prior service cost	(2,228	)	 	(1,760	)	
Amortization of net loss	5,268		 	3,969		
   Net periodic benefit cost	$	5,033		 	$	5,889		

Other Comprehensive Income (Loss) - The following table sets forth the amounts recognized in other comprehensive income (loss) related to our defined benefit pension benefits for the period indicated:

	
								
 	Pension Benefits	
 	Year Ended December 31,	
 	2015	 	2014	
 	(Thousands of dollars)	
Net gain (loss) arising during the period	$	339		 	$	(3,543	)	
Amortization of loss	917		 	518		
Deferred income taxes	(483	)	 	1,244		
   Total recognized in other comprehensive income (loss)	$	773		 	$	(1,781	)	

There were no amounts recognized in other comprehensive income (loss) related to our other postemployment benefits for the periods presented.

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The tables below sets forth the amounts in accumulated other comprehensive income (loss) that had not yet been recognized as components of net periodic benefit expense for the periods indicated:

	
								
 	Pension Benefits	
 	December 31,	
 	2015	 	2014	
 	(Thousands of dollars)	
Prior service credit (cost)	$	—		 	$	(266	)	
Accumulated loss	(407,798	)	 	(426,862	)	
Accumulated other comprehensive loss
  before regulatory assets	(407,798	)	 	(427,128	)	
Regulatory asset for regulated entities	400,625		 	418,699		
Accumulated other comprehensive loss
  after regulatory assets	(7,173	)	 	(8,429	)	
Deferred income taxes	2,772		 	3,255		
Accumulated other comprehensive loss,
  net of tax	$	(4,401	)	 	$	(5,174	)	

	
								
 	Other Postemployment Benefits	
 	December 31,	
 	2015	 	2014	
 	(Thousands of dollars)	
Prior service credit (cost)	$	14,010		 	$	4,337		
Accumulated loss	(50,447	)	 	(64,861	)	
Accumulated other comprehensive loss
  before regulatory assets	(36,437	)	 	(60,524	)	
Regulatory asset for regulated entities	36,437		 	60,524		
Accumulated other comprehensive loss
  after regulatory assets	—		 	—		
Deferred income taxes	—		 	—		
Accumulated other comprehensive loss,
  net of tax	$	—		 	$	—		

The following tables set forth the amounts recognized in either accumulated comprehensive income (loss) or regulatory assets expected to be recognized as components of net periodic benefit expense in the next fiscal year:

	
								
 	Pension Benefits	 	Other Postemployment Benefits	
Amounts to be recognized in 2016	(Thousands of dollars)	
Prior service credit (cost)	$	—		 	$	(3,633	)	
Actuarial net loss	$	35,542		 	$	4,608		

Health Care Cost Trend Rates - The following table sets forth the assumed health care cost-trend rates for the periods indicated:

	
				
	2015	 	2014	
Health care cost-trend rate assumed for next year	4.00% - 7.50%	 	4.00% - 7.75%	
Rate to which the cost-trend rate is assumed to decline
  (the ultimate trend rate)	4.00% - 5.00%	 	4.00% - 5.00%	
Year that the rate reaches the ultimate trend rate	2022	 	2022	

74

Assumed health care cost-trend rates have a significant effect on the amounts reported for our health care plans. A one percentage point change in assumed health care cost-trend rates would have the following effects:

	
								
	One Percentage		One Percentage	
	Point Increase		Point Decrease	
	(Thousands of dollars)	
Effect on total of service and interest cost	$	263			$	(266	)	
Effect on other postemployment benefit obligation	$	3,655			$	(3,752	)	

Plan Assets - Our investment strategy is to invest plan assets in accordance with sound investment practices that emphasize long-term fundamentals. The goal of this strategy is to maximize investment returns while managing risk in order to meet the plan’s current and projected financial obligations. To achieve this strategy, we have established a liability-driven investment strategy to change the allocations as the plan reaches certain funded status. The plan’s investments include a diverse blend of various domestic and international equities, investment-grade debt securities which mirror the cash flows of our liability, insurance contracts and alternative investments. The current target allocation for the assets of our defined benefit pension plan is as follows:

	
			
U.S. large-cap equities	37.4	%	
Investment-grade bonds	30.0	%	
Developed foreign large-cap equities	10.6	%	
Alternative investments	7.7	%	
Mid-cap equities	5.6	%	
Emerging markets equities	5.0	%	
Small-cap equities	3.7	%	
  Total	100	%	

As part of our risk management for the plans, minimums and maximums have been set for each of the asset classes listed above. All investment managers for the plan are subject to certain restrictions on the securities they purchase and, with the exception of indexing purposes, are prohibited from owning our stock.

The following tables set forth our pension benefits and other postemployment benefits plan assets by fair value category as of the measurement date:

	
													
	Pension Benefits	
	December 31, 2015	
Asset Category	Level 1	Level 2	Level 3	Total	
	(Thousands of dollars)	
Investments:					
Equity securities (a)	$	405,935		$	62,150		$	—		$	468,085		
Government obligations	—		44,651		—		44,651		
Corporate obligations (b)	—		139,396		—		139,396		
Cash and money market funds (c)	5,429		10,279		—		15,708		
Insurance contracts and group annuity contracts	—		—		56,465		56,465		
Other investments (d)	2,884		—		57,972		60,856		
  Total assets	$	414,248		$	256,476		$	114,437		$	785,161		
(a) - This category represents securities of the various market sectors from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments such as hedge funds and other financial instruments.

75

	
													
 	Pension Benefits	
 	December 31, 2014	
Asset Category	Level 1	Level 2	Level 3	Total	
 	(Thousands of dollars)	
Investments:	 	 	 	 	
Equity securities (a)	$	439,165		$	66,766		$	—		$	505,931		
Government obligations	—		47,769		—		47,769		
Corporate obligations (b)	—		153,412		—		153,412		
Cash and money market funds (c)	4,152		16,341		—		20,493		
Insurance contracts and group annuity contracts	—		—		59,877		59,877		
Other investments (d)	—		—		57,914		57,914		
  Total assets	$	443,317		$	284,288		$	117,791		$	845,396		
(a) - This category represents securities of the various market sectors from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments such as hedge funds.

	
													
 	Other Postemployment Benefits	
 	December 31, 2015	
Asset Category	Level 1	Level 2	Level 3	Total	
 	(Thousands of dollars)	
Investments:	 	 	 	 	
Equity securities (a)	$	54,560		$	7,498		$	—		$	62,058		
Government obligations	—		64		—		64		
Corporate obligations (b)	—		200		—		200		
Cash and money market funds (c)	233		13,322		—		13,555		
Insurance contracts and group annuity contracts	—		79,531		—		79,531		
Other investments (d)	4		—		83		87		
  Total assets	$	54,797		$	100,615		$	83		$	155,495		
(a) - This category represents securities of the various market sectors from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments such as hedge funds.

76

	
													
 	Other Postemployment Benefits	
 	December 31, 2014	
Asset Category	Level 1	Level 2	Level 3	Total	
 	(Thousands of dollars)	
Investments:	 	 	 	 	
Equity securities (a)	$	49,553		$	12,589		$	—		$	62,142		
Government obligations	—		78		—		78		
Corporate obligations (b)	—		251		—		251		
Cash and money market funds (c)	964		5,894		—		6,858		
Insurance contracts and group annuity contracts	—		82,353		—		82,353		
Other investments (d)	—		—		95		95		
  Total assets	$	50,517		$	101,165		$	95		$	151,777		
(a) - This category represents securities of the various market sectors from diverse industries.
(b) - This category represents bonds from diverse industries.
(c) - This category is primarily money market funds.
(d) - This category represents alternative investments such as hedge funds.

The following table sets forth the reconciliation of Level 3 fair value measurements of our pension plans for the periods indicated:

	
												
 	Pension Benefits	
 	Insurance
Contracts	 	Other
Investments	 	Total	
 	(Thousands of dollars)	
January 1, 2014	$	63,454		 	$	73,590		 	$	137,044		
Net realized and unrealized gains (losses)	3,446		 	(15,676	)	 	(12,230	)	
Settlements	(7,023	)	 	—		 	(7,023	)	
December 31, 2014	$	59,877		 	$	57,914		 	$	117,791		
Net realized and unrealized gains	2,188		 	58		 	2,246		
Settlements	(5,600	)	 	—		 	(5,600	)	
December 31, 2015	$	56,465		 	$	57,972		 	$	114,437		

Contributions - During 2015, we contributed $0.9 million to our defined benefit pension plans and we contributed $14.1 million to our other postemployment benefit plans. In 2016, we expect to contribute $0.9 million to our defined benefit pension plans and expect to contribute $5.8 million to our other postemployment benefit plans.

77

Pension and Other Postemployment Benefit Payments - Benefit payments for our defined benefit pension and other postemployment benefit plans for the period ended December 31, 2015 were $52.1 million and $14.6 million , respectively. The following table sets forth the pension benefits and other postemployment benefits payments expected to be paid in 2016-2025:

	
								
 	Pension
Benefits	 	Other Postemployment
Benefits	
Benefits to be paid in:	(Thousands of dollars)	
2016	$	53,359		 	$	14,116		
2017	$	54,710		 	$	13,875		
2018	$	56,201		 	$	14,435		
2019	$	57,238		 	$	14,956		
2020	$	58,901		 	$	15,406		
2021 through 2025	$	311,194		 	$	81,175		

The expected benefits to be paid are based on the same assumptions used to measure our benefit obligation at December 31, 2015, and include estimated future employee service.

Other Employee Benefit Plans

401(k) Plan - We have a 401(k) Plan which covers all full-time employees, and employee contributions are discretionary. We match 100 percent of each participant’s eligible contribution up to 6 percent of each participant’s eligible compensation, subject to certain limits. Our contributions made to the plan were $10.2 million and $9.7 million 2015 and 2014, respectively. Prior to our separation, ONEOK maintained a similar 401(k) Plan and compensation expense charged to us for employees who directly supported our operations by ONEOK totaled $8.3 million in 2013 for ONEOK’s matching contributions to this plan.

Profit-Sharing Plan - We have a profit-sharing plan for all employees that do not participate in our defined benefit pension plan. We plan to make a contribution to the profit-sharing plan each quarter equal to 1 percent of each participant’s eligible compensation during the quarter. Additional discretionary employer contributions may be made at the end of each year. Employee contributions are not allowed under the plan. Our contributions made to the plan were $6.5 million and $4.0 million in 2015 and 2014, respectively. ONEOK maintained a similar Profit-Sharing Plan and compensation expense associated with ONEOK’s contributions made to the plan for employees who directly supported our operations prior to the separation were $1.6 million in 2013.

Employee Deferred Compensation Plan - Our Nonqualified Deferred Compensation Plan provides select employees with the option to defer portions of their compensation and provides nonqualified deferred compensation benefits that are not available due to limitations on employer and employee contributions to qualified defined contribution plans under the federal tax laws. Contributions made to the plan were not material in 2015 and 2014. ONEOK maintained a similar plan and contributions made to the plan for employees who directly supported our operations prior to the separation were not material in 2013.

78

		
13.	INCOME TAXES	

The following table sets forth our provision for income taxes for the periods indicated:

	
												
 	Years Ended December 31,	
 	2015	 	2014	 	2013	
 	( Thousands of dollars )	
Current income tax provision	 	 	 	 	 	
Federal	$	7,135		 	$	17,006		 	$	—		
State	2,055		 	1,397		 	67		
Total current income tax provision	9,190		 	18,403		 	67		
Deferred income tax provision	 	 	 	 	 	
Federal	56,440		 	42,024		 	53,562		
State	7,349		 	7,911		 	8,643		
Total deferred income tax provision	63,789		 	49,935		 	62,205		
Total provision for income taxes	$	72,979		 	$	68,338		 	$	62,272		

The following table is a reconciliation of our income tax provision for the periods indicated:

												
 	Years Ended December 31,	
 	2015	 	2014	 	2013	
 	( Thousands of dollars )	
Income before income taxes	$	192,009		 	$	178,128		 	$	161,467		
Federal statutory income tax rate	35	%	 	35	%	 	35	%	
Provision for federal income taxes	67,203		 	62,345		 	56,513		
State income taxes, net of federal tax benefit	6,114		 	6,051		 	5,661		
Other, net	(338	)	 	(58	)	 	98		
Total provision for income taxes	$	72,979		 	$	68,338		 	$	62,272		

Prior to our separation from ONEOK, our operations were included in the consolidated federal and state income tax returns of ONEOK. Our income tax provision was calculated on a separate return basis. Accordingly, we recognized deferred tax assets and liabilities for the difference between the financial statement and income tax basis of assets and liabilities and carry-forward items, based on income tax laws and rates existing at the time the temporary differences are expected to reverse as if we had been a corporation for federal and state income tax purposes. In addition, ONEOK managed its tax position based upon the tax attributes of the consolidated group. Certain attributes may not be available to use if we had been operating as an independent company.

The following table sets forth the tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities for the periods indicated:

								
 	December 31,	
 	2015	 	2014	
 	( Thousands of dollars )	
Deferred tax assets	 	 	 	
Employee benefits and other accrued liabilities	$	110,148		 	$	128,715		
Net operating loss	—		 	8,144		
Other	7,848		 	5,655		
Total deferred tax assets	117,996		 	142,514		
Deferred tax liabilities	 	 	 	
Excess of tax over book depreciation	897,667		 	820,853		
Purchased-gas cost adjustment	3,999		 	16,177		
Other regulatory assets and liabilities, net	168,115		 	193,159		
Total deferred tax liabilities	1,069,781		 	1,030,189		
Net deferred tax liabilities	$	951,785		 	$	887,675		

79

At December 31, 2015 and 2014, we had income taxes receivable of $38.9 million and $43.8 million , respectively.

Prior to our separation from ONEOK, we were included in the ONEOK income tax returns for all applicable years. We file income tax returns in the United States federal jurisdiction as well as in the states where we have operations. In 2015, we filed our initial United States consolidated federal tax return for the period February 1, 2014 through December 31, 2014.

We have adopted ASU 2015-17, “Balance Sheet Classification of Deferred Taxes,” early to simplify our financial reporting process and have applied it prospectively for the period beginning October 1, 2015. Prior periods were not retrospectively adjusted.

14.	COMMITMENTS AND CONTINGENCIES	

Commitments - Operating leases represent future minimum lease payments under noncancelable leases covering office space, facilities and information technology hardware and software. Rental expense was $5.0 million in each of 2015 and 2014 and $4.8 million in 2013. The following table sets forth our operating lease payments for the periods indicated:

					
Operating Leases	
( Millions of dollars )	
2016	 	$	4.6		
2017	 	4.5		
2018	 	4.2		
2019	 	3.5		
2020	 	3.3		
Thereafter	 	7.0		
Total	 	$	27.1		

Environmental Matters - We are subject to multiple historical, wildlife preservation and environmental laws and/or regulations, which affect many aspects of our present and future operations. Regulated activities include, but are not limited to, those involving air emissions, storm water and wastewater discharges, handling and disposal of solid and hazardous wastes, wetland preservation, hazardous materials transportation, and pipeline and facility construction. These laws and regulations require us to obtain and/or comply with a wide variety of environmental clearances, registrations, licenses, permits and other approvals. Failure to comply with these laws, regulations, licenses and permits may expose us to fines, penalties and/or interruptions in our operations that could be material to our results of operations. In addition, emission controls and/or other regulatory or permitting mandates under the Clean Air Act and other similar federal and state laws could require unexpected capital expenditures. We cannot assure that existing environmental statutes and regulations will not be revised or that new regulations will not be adopted or become applicable to us. Revised or additional statutes or regulations that result in increased compliance costs or additional operating restrictions could have a material adverse effect on our business, financial condition, results of operations and cash flows.

We own or retain legal responsibility for the environmental conditions at 12 former manufactured natural gas sites in Kansas. These sites contain potentially harmful materials that are subject to control or remediation under various environmental laws and regulations. A consent agreement with the KDHE governs all work at these sites. The terms of the consent agreement allow us to investigate these sites and set remediation activities based upon the results of the investigations and risk analysis. Remediation involves typically the management of contaminated soils and may involve removal of structures and monitoring and/or remediation of groundwater.

We have completed or addressed removal of the source of soil contamination at 11 of the 12 sites according to plans approved by KDHE. Regulatory closure has been achieved at three of the sites. We have begun site assessment at the remaining site where no active remediation has occurred.

Our expenditures for environmental evaluation, mitigation, remediation and compliance to date have not been significant in relation to our financial position, results of operations or cash flows, and our expenditures related to environmental matters had no material effects on earnings or cash flows during 2015, 2014 and 2013 . A number of environmental issues may exist with respect to manufactured gas plants.  With the trend toward stricter standards, greater regulation and more extensive permit requirements for the types of assets operated by us that are subject to environmental regulation, our environmental expenditures could increase in the future, and such expenditures may not be fully covered by insurance or recoverable in rates from our customers, and those costs may adversely affect our financial condition, results of operations and cash flows.

80

Pipeline Safety - We are subject to PHMSA regulations, including integrity-management regulations. PHMSA regulations require pipeline companies operating high-pressure transmission pipelines to perform integrity assessments on pipeline segments that pass through densely populated areas or near specifically designated high-consequence areas. In January 2012, the Pipeline Safety, Regulatory Certainty and Job Creation Act was signed into law. The law increased maximum penalties for violating federal pipeline safety regulations and directs the DOT and Secretary of Transportation to conduct further review or studies on issues that may or may not be material to us. These issues include but are not limited to the following:

•	an evaluation of whether natural gas pipeline integrity-management requirements should be expanded beyond current high-consequence areas;	
		
•	a verification of records for pipelines in class 3 and 4 locations and high-consequence areas to confirm maximum allowable operating pressures; and	
		
•	a requirement to test previously untested pipelines operating above 30 percent yield strength in high-consequence areas.	

The potential capital and operating expenditures related to this legislation, the associated regulations or other new pipeline safety regulations are unknown.

Legal Proceedings - We are a party to various litigation matters and claims that have arisen in the normal course of our operations. While the results of litigation and claims cannot be predicted with certainty, we believe the reasonably possible losses from such matters, individually and in the aggregate, are not material. Additionally, we believe the probable final outcome of such matters will not have a material adverse effect on our results of operations, financial position or cash flows.

15.	QUARTERLY FINANCIAL DATA (UNAUDITED)	

	
																	
 	 	First
Quarter	 	Second
Quarter	 	Third
Quarter	 	Fourth
Quarter	
Year Ended December 31, 2015	 		 		 		 		
 	 	( Thousands of dollars )	
Revenues	 	$	676,531		 	$	256,786		 	$	225,226		 	$	389,149		
Net margin	 	$	262,978		 	$	176,837		 	$	170,502		 	$	231,416		
Operating income	 	$	109,005		 	$	31,270		 	$	24,951		 	$	73,903		
Net income	 	$	60,381		 	$	12,076		 	$	7,371		 	$	39,202		
Earnings per share	 	 	 	 	 	 	 	 	
   Basic	 	$	1.15		 	$	0.23		 	$	0.14		 	$	0.75		
   Diluted	 	$	1.13		 	$	0.23		 	$	0.14		 	$	0.74		

																	
 	 	First
Quarter	 	Second
Quarter	 	Third
Quarter	 	Fourth
Quarter	
Year Ended December 31, 2014	 		 		 		 		
 	 	( Thousands of dollars )	
Revenues	 	$	766,178		 	$	296,838		 	$	241,522		 	$	514,368		
Net margin	 	$	259,836		 	$	176,493		 	$	166,452		 	$	224,176		
Operating income	 	$	109,353		 	$	26,812		 	$	19,119		 	$	70,010		
Net income	 	$	59,076		 	$	9,454		 	$	4,653		 	$	36,607		
Earnings per share	 	 	 	 	 	 	 	 	
   Basic	 	$	1.13		 	$	0.18		 	$	0.09		 	$	0.70		
   Diluted	 	$	1.13		 	$	0.18		 	$	0.09		 	$	0.69		

81

		
ITEM 9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	

None.

ITEM 9A.    CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our Chief Executive Officer (Principal Executive Officer) and Chief Financial Officer (Principal Financial Officer) have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report based on the evaluation of the controls and procedures required by Rule 13a-15(b) of the Exchange Act.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our Principal Executive Officer and Principal Financial Officer, we evaluated the effectiveness of our internal control over financial reporting based on the framework in Internal Control-Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Because of inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Based on our evaluation under that framework and applicable SEC rules, our management concluded that our internal control over financial reporting was effective as of December 31, 2015 .

The effectiveness of our internal control over financial reporting as of December 31, 2015 , has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their reports which are included herein (Item 8).

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting during the quarter ended December 31, 2015 , that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B.    OTHER INFORMATION

Not applicable.

PART III.

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors of the Registrant

Information concerning our directors is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

Executive Officers of the Registrant

Information concerning our executive officers is included in Part I, Item 1, Business, of this Annual Report.

Compliance with Section 16(a) of the Exchange Act

Information on compliance with Section 16(a) of the Exchange Act is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

82

Code of Ethics

Information concerning the code of ethics, or code of business conduct, is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

Nominating Procedures

Information concerning the nominating procedures is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

The Audit Committee

Information concerning the Audit Committee is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

The Audit Committee Financial Experts

Information concerning the Audit Committee Financial Experts is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

The Executive Compensation Committee

Information concerning the Executive Compensation Committee is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

The Corporate Governance Committee

Information concerning the Corporate Governance Committee is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

The Executive Committee

Information concerning the Executive Committee is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

Committee Charters

The full text of our Audit Committee charter, Executive Compensation Committee charter, Corporate Governance Committee charter and Executive Committee charter are published on and may be printed from our website at www.onegas.com and are also available from our corporate secretary upon request.

ITEM 11.    EXECUTIVE COMPENSATION

Information on executive compensation is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

ITEM 12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	

Security Ownership of Certain Beneficial Owners

Information concerning the ownership of certain beneficial owners is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

Security Ownership of Management

Information on security ownership of directors and officers is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

83

Equity Compensation Plan Information

The following table sets forth certain information concerning our equity compensation plans as of December 31, 2015:

												
 	 	Number of Securities Issued Upon Exercise of Outstanding Options, Warrants and Rights	 	Weighted-Average Exercise Price of Outstanding Options, Warrants and Rights	 	Number of Securities Remaining Available For Future Issuance Under Equity Compensation Plans (Excluding Securities in Column (a))	
Plan Category	 	(a)	 	(b)	 	(c)	
Equity compensation plans approved by security holders (1)	 	—		 	$	—		(3	)	2,191,002		
Equity compensation plans not approved by security holders (2)	 	—		 	$	—		 	612,410		
Total	 	—		 	$	—		 	2,803,412		
(1) Includes restricted stock incentive units and performance-unit awards granted under our Equity Compensation Plan and our Nonqualified Deferred Compensation Plan for Nonemployee Directors. For a brief description of the material features of this plan, see Note 12 of the Notes to Financial Statements in this Annual Report.
(2) Includes shares granted under our Employee Stock Purchase Plan and Employee Stock Award Program. For a brief description of the material features of these plans, see Note 11 of the Notes to Financial Statements in this Annual Report. Column (c) includes 546,234 and 66,176 shares available for future issuance under our Employee Stock Purchase Plan and Employee Stock Award Program, respectively.
(3) Compensation deferred into our common stock under our Employee Non-Qualified Deferred Compensation Plan and Deferred Compensation Plan for Nonemployee Directors is distributed to participants at fair market value on the date of distribution. The price used for these plans to calculate the weighted-average exercise price in the table is $50.17, which represents the year-end closing price of our common stock on the NYSE.

		
ITEM 13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	

Information on certain relationships and related transactions and director independence is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

		
ITEM 14.	PRINCIPAL ACCOUNTING FEES AND SERVICES	

Information on the principal accountant’s fees and services is set forth in our 2016 definitive Proxy Statement and is incorporated herein by this reference.

84

PART IV.

ITEM 15.      EXHIBITS, FINANCIAL STATEMENT SCHEDULES

	
				
(1) Financial Statements	Page No.	
 	 	 	 	
 	(a)	Report of Independent Registered Public Accounting Firm	45	
 	 	 	 	
 	(b)	Statements of Income for the years ended December 31, 2015, 2014 and 2013	46	
 	 	 	 	
 	(c)	Statements of Comprehensive Income for the years ended
December 31, 2015, 2014 and 2013	47	
 	 	 	 	
 	(d)	Balance Sheets as of December 31, 2015 and 2014	48-49	
 	 	 	 	
 	(e)	Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013	51	
 	 	 	 	
 	(f)	Statements of Equity for the years ended December 31, 2015, 2014 and 2013	52-53	
 	 	 	 	
 	(g)	Notes to Financial Statements	54-81	
 	 	 	 	
(2) Financial Statements Schedules	 	
 	 	 	 	
 	All schedules have been omitted because of the absence of conditions under which they are required.	

			
(3) Exhibits	
 	 	 	
 	2.1	Separation and Distribution Agreement, dated as of January 14, 2014, by and between ONE Gas, Inc. and
ONEOK, Inc. (incorporated by reference to Exhibit 2.1 to ONE Gas, Inc.’s Current Report on Form 8-K
filed on January 15, 2014 (File No. 1-36108)).	
 	 	 	
 	3.1	Amended and Restated Certificate of Incorporation of ONE Gas, Inc., dated January 31, 2014 (incorporated
by reference to Exhibit 4.5 to ONE Gas, Inc.’s Registration Statement on Form S-8 filed on January 31,
2014 (File No. 333-193690)).	
 	 	 	
 	3.2	Amended and Restated By-Laws of ONE Gas, Inc. (incorporated by reference to Exhibit 4.6
to ONE Gas, Inc.’s Registration Statement on Form S-8 filed on January 31, 2014 (File No. 333-193690)).	
 	 	 	
 	4.1	Form of Common Stock Certificate (incorporated by reference to Exhibit 4.2 to ONE Gas, Inc.’s
Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	4.2	Indenture, dated January 27, 2014, between ONE Gas, Inc. and U.S. Bank National Association, as trustee
(incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on
January 30, 2014 (File No. 1-36108)).	
 	 	 	
 	4.3	Supplemental Indenture No. 1, dated January 27, 2014, between ONE Gas, Inc. and U.S. Bank National
Association, as trustee (incorporated by reference to Exhibit 10.2 to ONE Gas, Inc.’s
Current Report on Form 8-K filed on January 30, 2014 (File No. 1-36108)).	

85

	
			
 	4.4	Registration Rights Agreement, dated January 27, 2014, among Morgan Stanley & Co. LLC, J.P. Morgan
Securities LLC and RBS Securities Inc., as representatives of the several initial purchasers named therein
(incorporated by reference to Exhibit 10.3 to ONE Gas, Inc.’s Current Report on Form 8-K filed on
January 30, 2014 (File No. 1-36108)).	
 	 	 	
 	10.1	Tax Matters Agreement, dated January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc.
(incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on January
15, 2014 (File No. 1-36108)).	
 	 	 	
 	10.2	Transition Services Agreement, dated January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc.
(incorporated by reference to Exhibit 10.2 to ONE Gas, Inc.’s Current Report on Form 8-K filed on January
15, 2014 (File No. 1-36108)).	
 	 	 	
 	10.3	Employee Matters Agreement, dated January 14, 2014, by and between ONE Gas, Inc. and ONEOK, Inc.
(incorporated by reference to Exhibit 10.3 to ONE Gas, Inc.’s Current Report on Form 8-K filed on January
15, 2014 (File No. 1-36108)).	
 	 	 	
 	10.4	Form of ONE Gas, Inc. Indemnification Agreement between ONE Gas, Inc. and ONE Gas, Inc. officers and
directors (incorporated by reference to Exhibit 10.5 to ONE Gas, Inc.’s Registration Statement on Form
10 filed on October 1, 2013 (File No. 1-36108)).	
 	 	 	
 	10.5	ONE Gas, Inc. Annual Officer Incentive Plan (incorporated by reference to Exhibit 10.6 to ONE Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.6	ONE Gas, Inc. Pre-2005 Nonqualified Deferred Compensation Plan (incorporated by reference
to Exhibit 10.7 to ONE Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.7	ONE Gas, Inc. Employee Nonqualified Deferred Compensation Plan (incorporated by reference
to Exhibit 10.8 to ONE Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.8	ONE Gas, Inc. Pre-2005 Supplemental Executive Retirement Plan (incorporated by reference to
Exhibit 10.9 to ONE Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.9	ONE Gas, Inc. Supplemental Executive Retirement Plan (incorporated by reference to Exhibit
10.10 to ONE Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.10	Credit Agreement, dated as of December 20, 2013, among ONE Gas, Inc., Bank of America, N.A.,
as administrative agent, swingline lender and a letter of credit issuer, and the other lenders and letter of credit
issuers parties thereto (incorporated by reference to Exhibit 10.2 to ONEOK, Inc.’s Current Report on Form
8-K filed on December 23, 2013 (File No. 1-13643)).	
 	 	 	
 	10.11	ONE Gas, Inc. Officer Change in Control Severance Plan (incorporated by reference to
Exhibit 10.12 to ONE Gas, Inc.’s Registration Statement filed on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.12	ONE Gas, Inc. Equity Compensation Plan (incorporated by reference to Exhibit 10.13 to ONE
Gas, Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.13	Form of 2014 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.13 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 25, 2014 (File No. 1-36108)).	

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 	10.14	Form of 2014 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.14 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 25, 2014 (File No. 1-36108)).	
 	 	 	
 	10.15	Form of 2013 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.15 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 25, 2014 (File No. 1-36108)).	
 	 	 	
 	10.16	Form of 2013 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.16 to ONE Gas, Inc.’s Annual Report on Form 10-K filed on February 25, 2014 (File No. 1-36108)).	
 	 	 	
 	10.17	ONE Gas, Inc. Equity Compensation Plan (incorporated by reference to Appendix A to ONE Gas, Inc.’s Definitive Proxy Statement on Schedule 14A filed on April 1, 2015 (File No. 1-36108)).	
 	 	 	
 	10.18	ONE Gas, Inc. Employee Stock Purchase Plan (incorporated by reference to Exhibit 10.16 to ONE Gas,
Inc.’s Registration Statement on Form 10, Amendment No. 2 filed on December 23, 2013 (File No. 1-36108)).	
 	 	 	
 	10.19	ONE Gas, Inc. Deferred Compensation Plan for Non-Employee Directors (incorporated by reference to
Exhibit 10.1 to ONE Gas, Inc. Current Report on Form 8-K filed on February 24, 2014 (File No. 1-36108)).	
 	 	 	
 	10.20	ONE Gas, Inc. 401(k) Plan of ONE Gas Employees and Former ONE Gas Employees effective as of January
1, 2014 (incorporated by reference to Exhibit 4.4 to ONE Gas, Inc.’s Registration Statement on Form S-8
filed on January 31, 2014 (File No. 333-193690)).	
 	 	 	
 	10.21	Form of Commercial Paper Dealer Agreement (incorporated by reference to Exhibit 10.1 to ONE Gas, Inc.’s Current Report on Form 8-K filed on September 10, 2014 (File No. 1-36108)).	
 	 	 	
 	10.22	Form of 2015 Performance Unit Award Agreement (incorporated by reference to Exhibit 10.2 to ONE Gas, Inc.’s Quarterly Report on Form 10-Q filed on April 30, 2015 (File 1-36108)).	
 	 	 	
 	10.23	Form of 2015 Restricted Unit Award Agreement (incorporated by reference to Exhibit 10.3 to ONE Gas, Inc.’s Quarterly Report on Form 10-Q filed on April 30, 2015 (File 1-36108)).	
 	 	 	
 	10.24	Form of 2016 Performance Unit Award Agreement.	
 	 	 	
 	10.25	Form of 2016 Restricted Unit Award Agreement.	
 	 	 	
 	12.1	Computation of Ratio of Earnings to Fixed Charges for the years ended December 31, 2015, 2014, 2013,
2012 and 2011.	
 	 	 	
 	21.1	Subsidiaries of ONE Gas, Inc.	
 	 	 	
 	23.1	Consent of Independent Registered Public Accounting Firm - PricewaterhouseCoopers LLP.	
 	 	 	
 	31.1	Certification of Pierce H. Norton II pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	
 	 	 	
 	31.2	Certification of Curtis L. Dinan pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	
 	 	 	
 	32.1	Certification of Pierce H. Norton II pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).	
 	 	 	
 	32.2	Certification of Curtis L. Dinan pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002 (furnished only pursuant to Rule 13a-14(b)).	

87

	
			
 	101.INS	XBRL Instance Document.

 	101.SCH	XBRL Schema Document.

 	101.CAL	XBRL Calculation Linkbase Document.	
 	 	 	
 	101.LAB	XBRL Label Linkbase Document.

 	101. PRE	XBRL Presentation Linkbase Document.

 	101.DEF	XBRL Extension Definition Linkbase Document.

Attached as Exhibit 101 to this Annual Report are the following XBRL-related documents: (i) Document and Entity Information; (ii) Statements of Income for the years ended December 31, 2015, 2014 and 2013; (iii) Statements of Comprehensive Income for the years ended December 31, 2015, 2014 and 2013; (iv) Balance Sheets for the years ended December 31, 2015 and 2014; (v) Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013; (vi) Statements of Equity for the years ended December 31, 2015, 2014 and 2013; and (vii) Notes to Financial Statements.

We also make available on our website the Interactive Data Files submitted as Exhibit 101 to this Annual Report.

88

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			
Date: February 18, 2016	 	ONE Gas, Inc.	
 	 	Registrant	
 	 	 	
 	By:	/s/ Curtis L. Dinan	
 	 	Curtis L. Dinan	
 	 	Senior Vice President,	
 	 	Chief Financial Officer and Treasurer	

Pursuant to the requirements of the Exchange Act, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on this 18th day of February 2016 .

	
				
 	/s/ John W. Gibson	 	/s/ Pierce H. Norton II	
 	John W. Gibson	 	Pierce H. Norton II	
 	Chairman of the Board	 	President, Chief Executive Officer and	
 	 	 	Director	
 	 	 	 	
 	/s/ Curtis L. Dinan	 	/s/ Robert B. Evans	
 	Curtis L. Dinan	 	Robert B. Evans	
 	Senior Vice President,	 	Director	
 	Chief Financial Officer and Treasurer	 	 	
 	(Principal Accounting Officer)	 	 	
 	 	 	 	
 	/s/ Michael G. Hutchinson	 	/s/ Pattye L. Moore	
 	Michael G. Hutchinson	 	Pattye L. Moore	
 	Director	 	Director	
 	 	 	 	
 	/s/ Eduardo A. Rodriguez	 	/s/ Douglas H. Yaeger	
 	Eduardo A. Rodriguez	 	Douglas H. Yaeger	
 	Director	 	Director	

89

Exhibit 10.24

ONE GAS, INC.

PERFORMANCE UNIT AWARD AGREEMENT

This Performance Unit Award Agreement (this “Agreement”) is made and entered into as of February 16, 2016 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and [EMPLOYEE NAME] (the “Participant”).

WHEREAS , the Company has adopted the ONE Gas, Inc. Equity Compensation Plan (the “Plan”) pursuant to which Performance Unit Awards may be granted; and

WHEREAS , the Executive Compensation Committee of the Board of Directors (the "Committee") has determined that it is in the best interests of the Company to grant the Performance Unit Award provided for herein.

NOW, THEREFORE, the parties hereto, intending to be legally bound, agree as follows:

1.	Grant of Performance Units .	

1.1    The Company hereby grants to the Participant an award consisting of [NUMBER] Performance Units (“Performance Units” or the “Award”) on the terms and conditions set forth in this Agreement, the Notice of Performance Unit Award and Agreement dated February 16, 2016, a copy of which is attached hereto and incorporated herein by reference, and the Plan. The Performance Units are contingently awarded and will be earned if and only to the extent that the performance goal described on Exhibit A (the “Performance Goal”) is met and vested and distributable only if other conditions in this Agreement are met. Each Performance Unit represents the right to receive one share of the Company’s common stock (“Share”) or, at the Company’s option, an amount of cash as set forth in Section 6.2, in either case, at the times and subject to the conditions set forth herein. The number of Performance Units set forth above is equal to a target number of Shares that the Participant will earn for 100% achievement of the Performance Goal (the “Target Award”). Capitalized terms that are used but not defined herein have the meanings set forth in the Plan.

1.2    The Performance Units shall be credited to a separate account maintained for the Participant on the books and records of the Company (the “Account”). All amounts credited to the Account shall continue for all purposes to be part of the general assets of the Company.

2. Consideration . The Award is granted in consideration of the Participant’s continued employment with the Company.

		
3.	Vesting .	

3.1     General . Except as provided in this Section 3, subject to Participant’s continuous employment with the Company during the period beginning on the Grant Date and ending on February 18, 2019 (the “Performance Period”) and subject to the terms of this Agreement, the Participant shall vest at the end of the Performance Period in the number of Performance Units, if any, earned upon, and certified following, the attainment of the Performance Goal as of the end of the Performance Period. Any Performance Units that do not vest as of the end of the Performance Period shall be forfeited. Performance Units that vest pursuant to the terms of this Agreement, including Sections 3.2 and 3.3 below, are hereinafter referred to as “Vested Units” and the date upon which the Performance Units vest is hereinafter referred to as a “Vesting Date.” Unless and until the Performance Units have vested, Participant will have no right to receive any Shares subject thereto. Prior to the actual delivery of any Shares, the Award will represent an unsecured obligation of the Company, payable only from the Company’s general assets.

3.2     Termination of Employment . If prior to the end of the Performance Period, the Participant ceases to be employed by the Company on account of the Participant’s Retirement, Total Disability or death, the Participant will vest in a pro-rata portion of the Performance Units as of the last day of the Performance Period if the Performance Goal and requirements of this Agreement are met as of such date. The pro-rata portion of the Performance Units that vest will be determined by multiplying (x) the maximum number of Performance Units in which the Participant could vest, based on the actual level at which the Performance Goal is attained and certified for the Performance Period, as if the Participant remained in the employ of the Company through the end of the Performance Period, by (y) a fraction, which fraction shall be equal to the number of full months which have elapsed under the Performance Period at the time of such termination of employment by the number of full months in the Performance Period. If the Participant’s employment with the Company terminates prior to the end of the Performance Period for any other reason, Participant shall immediately forfeit any and all Performance Units that have not vested or do not vest on or prior to the Participant’s termination date and neither the Company nor any Subsidiary shall have any further obligations to the Participant under this Agreement. For purposes of this Agreement, employment with any Subsidiary of the Company shall be treated as employment with the Company. Likewise, a termination of employment shall not be deemed to occur by reason of a transfer of employment between the Company and any Subsidiary. For purposes of this Agreement:

(a)	“Retirement” means a voluntary termination of employment of the Participant with the Company by the Participant if at the time of such termination of employment the Participant has both completed five (5) years of service with the Company and attained age fifty (50).	

2

		
(b)	“Total Disability” means that the Participant is permanently and totally disabled and unable to engage in any substantial gainful activity by reason of a medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than twelve (12) months, and has established such disability to the extent and in the manner and form as may be required by the Committee.	

3.3     Change in Control . If a Change in Control occurs prior to the end of the Performance Period and the Participant is employed by the Company at the time of the Change in Control, but subsequently terminates prior to the end of the Performance Period based on an involuntary termination (without cause) or a voluntary termination with "good reason" within 24 months of the Change in Control date, then the Performance Period will end on the date of the termination due to the Change in Control and the Performance Units will be deemed vested at the Target Award level as of the date of the termination due to Change in Control (the “Change in Control Date”). Good reason includes:
• Demotion or material reduction of authority or responsibility;
• Material reduction in base salary;
• Material reduction in annual incentive or LTI targets;
• Relocation of greater than 35 miles; or
• Failure of the successor company to assume the change-in-control plan.

Notwithstanding the foregoing, the provisions set forth in the Plan applicable to a Change in Control shall apply to the Award, and in the event of a Change in Control, the Committee, in its sole discretion and to the extent permitted by Section 409A, may take such actions as it deems appropriate pursuant to the Plan. For purposes of this Agreement, the term "Change in Control" shall have the same meaning as provided in the Plan.

3.4     Certification . Except in the event of a Change in Control, the Committee shall, within a reasonably practicable time following the end of the Performance Period, certify to the extent, if any, to which the Performance Goal has been achieved with respect to the Performance Period and the number of Performance Units, if any, earned upon attainment of the Performance Goal. Such certification shall be final, conclusive and binding on the Participant, and on all other persons, to the maximum extent permitted by law.

4. Transfer Restrictions .

4.1    Except as provided in Section 4.2, during the Performance Period and until such time as the Shares underlying the Vested Units have been issued, the Performance Units, related Shares or the rights relating thereto may not be sold, pledged, assigned, transferred or otherwise disposed of by the Participant in any manner other than by will or by laws of descent and

3

distribution. Except as provided in Section 4.2, any attempt to sell, pledge, assign, transfer or otherwise dispose of the Performance Units, related Shares or the rights relating thereto shall be wholly ineffective and, if any such attempt is made, the Performance Units, related Shares or the rights relating thereto will be forfeited by the Participant and all of the Participant's rights to such units or related Shares shall immediately terminate without any payment or consideration by the Company.

4.2    Notwithstanding the foregoing, the Participant may transfer any part or all of the Participant’s rights in the Performance Units to members of the Participant’s immediate family, or to one or more trusts for the benefit of such immediate family members, or partnerships in which such immediate family members are the only partners if the Participant does not receive any consideration for the transfer. In the event of any such transfer, Performance Units shall continue to be subject to the same terms and conditions otherwise applicable hereunder and under the Plan immediately prior to transfer, except that such rights shall not be further transferable by the transferee inter vivos , except for transfer back to the Participant. For any such transfer to be effective, the Participant must provide prior written notice thereof to the Committee and the Participant shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer. For purposes of this Agreement, “immediate family” shall mean the Participant’s spouse, children and grandchildren.

5. Dividend Equivalents . During the Performance Period, the Participant's Account shall be credited with an amount equal to all ordinary cash dividends (“Dividend Equivalents”) that would have been paid to the Participant if one Share had been issued on the Grant Date for each Performance Unit granted to the Participant as set forth in this Agreement. The Dividend Equivalents credited to the Participant’s Account will be deemed to be reinvested in additional Performance Units (or fractional units) and will be subject to the same terms and conditions as the Performance Units to which they are attributable and shall vest or be forfeited (if applicable) and settled at the same time as the Performance Units to which they are attributable. Such additional Performance Units shall also be credited with additional Dividend Equivalents as any further dividends are declared.

6. Time and Form of Payment with Respect to Vested Units

6.1    Unless an election is made pursuant to Section 7 below and subject to Section 10 and Section 23.2 and subject to certification by the Committee that the Performance Goal has been achieved and other vesting conditions have been satisfied, the Participant will receive a distribution with respect to the Vested Units within 75 days following the earlier of (i) the last day of the Performance Period (the “Distribution Date”) or (ii) the date of termination due to a Change in Control as described in 3.3. The Vested Units will be settled and distributed in Shares (either in book-entry form or otherwise) or, at the Company’s option, paid in an amount of cash

4

as set forth in Section 6.2. All distributions in Shares shall be in the form of whole Shares, and any fractional Share shall be distributed in cash in an amount equal to the value of such fractional Share determined based on the Fair Market Value of a Share on the Vesting Date.

6.2    If the Company elects to settle the Participant’s Vested Units in cash, the amount of cash payable with respect to each Vested Unit shall be equal to the Fair Market Value of a Share on the Vesting Date.  

6.3    To the extent that the Participant does not vest in any Performance Units on or before the end of the Performance Period, all interest in such Performance Units and any additional Performance Units attributable to Dividend Equivalents shall be forfeited. The Participant has no right or interest in any Performance Units that are forfeited.

7. Deferral Election for Officers .

7.1    If the Participant is an officer of the Company, the Participant may irrevocably elect to defer the Distribution Date of Performance Units, Shares and cash that the Participant becomes entitled to receive under this Agreement (the “Deferred Amounts”) to a later date, by filing with the Committee, on or before the deferral election date (the “Election Deadline”) described in Section 7.2 below, a signed written irrevocable election (the “Election”) which shall be in the form substantially the same as attached hereto as Exhibit C, or as otherwise approved by the Committee.

7.2    Any such Election shall be filed with the Committee on or before the Election Deadline, which shall be August 17, 2018, the date that is six (6) months before the end of the Performance Period, and shall become effective and irrevocable on such date provided that the Participant performs services for the Company continuously from the later of the beginning of the Performance Period or the date the Performance Goal was established through the Election Deadline. Notwithstanding the foregoing, in no event shall the Participant’s Election become effective if any portion of the Deferred Amounts has become readily ascertainable (within the meaning of Section 409A) and is substantially certain to be paid the Participant as of the Election Deadline. To defer the Distribution Date, the Participant must elect to defer one-hundred percent (100%) of the Deferred Amounts. Subject to Section 23.2, the Deferred Amounts shall be distributed to Participant at the time and in the form set forth in the Election (the “Deferred Date”). Notwithstanding a Participant’s Election pursuant to this Section 7, if a Change in Ownership or Control (within the meaning of Section 409A) occurs prior to the Deferred Date, the Deferred Amounts will be distributed to the Participant on the date of the Change in Ownership or Control.

7.3    This Section 7 shall be applicable solely to the Award and shall not apply to any other compensation payable to the Participant under the Plan or otherwise. The right to make a deferral election under this Section 7 is expressly limited to officers of the Company or any

5

subset thereof as determined by the Committee from time to time. This Agreement shall not permit a subsequent election to delay or modify the form of payment unless authorized and agreed upon in writing by the Company and Participant and such subsequent election complies with Section 409A.

8. Conditions to Issuance or Transfer of Shares . The issuance and transfer of Shares shall be subject to compliance by the Company and the Participant with all applicable laws, rules and regulations (“Applicable Laws”) and also to such approvals by governmental agencies as may be deemed appropriate to comply with relevant securities laws and regulations. No Shares shall be issued or transferred unless and until any then applicable requirements of Applicable Laws and regulatory agencies have been fully complied with to the satisfaction of the Company and its counsel.

9. Tax Withholding . Participant shall be required to pay to the Company, and the Company shall have the right to deduct from any compensation paid to the Participant pursuant to the Plan, the amount of any required federal, state and local taxes, domestic or foreign, including payroll taxes, in respect of the Award and to take all such other action as the Committee deems necessary to satisfy all obligations for the payment of such withholding taxes. The Company shall have no obligation to issue any Shares to any Participant unless and until the Participant has made arrangements, satisfactory to the Company in its sole discretion, to satisfy the Participant’s tax liability resulting from the vesting or settlement of the Vested Units. The amount of such withholding shall be determined by the Company. The Committee, in its sole discretion, may permit or require the Participant to satisfy any such tax withholding obligation by any of, or a combination of, the following means:

9.1     tendering a cash payment or check payable to the Company.

9.2    authorizing the Company to withhold an amount from any cash amounts otherwise due or to become due from the Company to the Participant.

9.3    authorizing the Company to withhold Shares from the Shares otherwise issuable to the Participant as a result of the vesting of the Performance Units; provided, however , that no Shares shall be withheld with a value exceeding the minimum amount of tax required to be withheld by Applicable Law.

9.4    delivering to the Company previously owned and unencumbered Shares having a then current Fair Market Value not exceeding the minimum amount of tax required to be withheld by Applicable Law.

10. Rights as Shareholder . Except as otherwise provided in the Agreement, the Participant shall not have any of the rights or privileges of a shareholder with respect to the Shares underlying the Performance Units unless and until the Performance Units vest and certificates

6

representing such Shares (which may be in book-entry form) have been issued and recorded on the Company’s records, and delivered to the Participant or to an escrow account for the Participant’s benefit. After such issuance, recordation and delivery, Participant will have the rights of a shareholder of the Company with respect to such Shares, including without limitation, voting rights and the right to receipt of dividends and distributions on such Shares.

11. No Right to Continued Service . Neither the Plan nor this Agreement shall confer upon the Participant to serve as an employee or other service provider of the Company. Further, nothing in the Plan or this Agreement shall be construed to limit the discretion of the Company to terminate the services of the Participant at any time, with or without Cause.

12. Adjustments . In the event of a change in capitalization described in Section 15 of the Plan prior to the end of the Performance Period, other than a dividend described in Section 5 above, the Performance Units shall be equitably adjusted or terminated in any manner contemplated by the Plan to reflect the effect of such event or change in the Company’s capital structure in such a way as to preserve the value of the Award.

13. Required Participant Repayment/Reduction Provision . Notwithstanding anything in the Plan or this Agreement to the contrary, all or a portion of the Award made to the Participant under this Agreement is subject to being called for repayment to the Company or reduced in any situation where the Board or a committee thereof determines that fraud, negligence, or intentional misconduct by the Participant was a contributing factor to the Company having to restate all or a portion of its financial statement(s). The Committee may determine whether the Company shall effect any such repayment or reduction: (i) by seeking repayment from the Participant, (ii) by reducing (subject to Applicable Law and the Plan’s terms and conditions or any other applicable plan, program, or arrangement) the amount that would otherwise be awarded or payable to the Participant under the Award, the Plan or any other compensatory plan,program, or arrangement maintained by the Company, (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Company’s otherwise applicable compensation practices, or (iv) by any combination of the foregoing. The determination regarding the Participant’s conduct, and repayment or reduction under this provision shall be within the Committee’s sole discretion and shall be final and binding on the Participant and the Company. The Participant, in consideration of the grant of the Award, and by the Participant's execution of this Agreement, acknowledges the Participant's understanding and agreement to this provision, and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the event of a call for repayment or other action by the Company or Committee to effect its terms with respect to the Participant, the Award and/or any other compensation described herein.

7

14. Company Policies . The Participant agrees that the Award will be subject to any applicable insider trading policies, retention policies and other policies that may be implemented by the Board, from time to time.

15. Participant Undertaking . The Participant agrees to take whatever additional actions and execute whatever additional documents the Company may in its reasonable judgment deem necessary or advisable in order to carry out or effect one or more of the obligations or restrictions imposed on the Participant pursuant to the terms of this Agreement. It is intended by the Company that the Plan and Shares covered by the Award are to be registered under the Securities Act of 1933, as amended, prior to the grant date; provided that in the event such registration is for any reason not effective for such Shares, the Participant agrees that all Shares acquired pursuant to the grant will be acquired for investment and will not be available for sale or tender to any third party.

16. Beneficiary . The Participant may designate a Beneficiary to receive any rights of the Participant which may become vested in the event of the Participant’s death under procedures and in the form established by the Committee; and in the absence of such designation of a Beneficiary, any such rights shall be deemed to be transferred to the Participant’s estate.

17. Notices . Any notice required to be delivered to the Company under this Agreement shall be in writing and addressed to the Senior Vice President-Administration and Chief Information Officer or his successor who is in charge of Human Resources of the Company at the Company's principal corporate offices. Any notice required to be delivered to the Participant under this Agreement shall be in writing and addressed to the Participant at the Participant's address as shown in the records of the Company. Either party may designate another address in writing (or by such other method approved by the Company) from time to time. Any notice shall be delivered by hand, sent by telecopy or enclosed in a properly sealed envelope addressed as stated above, registered and deposited, postage prepaid, in a post office regularly maintained by the United States Postal Service.

18. Incorporation of the Plan; Conflicts . The Performance Units and the Shares issued to Participant hereunder are subject to the terms and conditions set forth in this Agreement and the Plan, which is incorporated herein by reference. In the event of any inconsistency between (1) the Plan and this Agreement, the Plan will control, or (2) the resolutions and records of the Board or Committee and this Agreement, the resolutions and records of the Board or Committee will control.

19. Successors and Assigns . The Company may assign any of its rights under this Agreement, and this Agreement will be binding upon and inure to the benefit of the Company’s successors and assigns. Subject to the restrictions on transfer set forth herein and the Plan, this Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto.

8

20. No Impact on Other Benefits . The Company does not intend for the value of the Award or any Vested Units to be included in the Participant’s normal or expected compensation for purposes of calculating any severance, retirement, welfare, insurance or similar employee benefit; provided, however , that if there is any inconsistency between this Agreement and the terms of another benefit plan, the benefit plan document will control.

21. Discretionary Nature of Plan . The Plan is discretionary and may be amended, cancelled or terminated by the Board at any time, in its discretion. The grant of the Performance Units in this Agreement does not create any contractual right or other right to receive any Performance Units or other awards in the future. Future awards, if any, will be at the Committee’s sole discretion. Any amendment, modification, or termination of the Plan shall not constitute a change or impairment of the terms and conditions of the Participant's employment with the Company.

22. Amendment . In accordance with the Plan, the Committee may amend or otherwise modify, suspend, discontinue or terminate this Agreement at any time, prospectively or retroactively.

23. Section 409A .

23.1    This Award and Agreement is intended to comply with Section 409A or an exemption thereunder and shall be construed and interpreted in a manner that is consistent with the requirements for avoiding additional taxes or penalties under Section 409A. Notwithstanding any other provision of the Agreement, any distributions or payments due hereunder may only be made upon an event and in a manner that complies with Section 409A or an applicable exemption. Any distributions or payments due hereunder upon a termination of employment shall only be made upon a "separation from service" as defined in Section 409A. The right to a series of installment payments under this Agreement shall be treated as a right to a series of separate payments. Except as provided in Section 7, in no event may the Participant, directly or indirectly, designate the calendar year of settlement, distribution or payment.

23.2    If an Award is subject to Section 409A and Participant becomes entitled to settlement of the Award on account of a separation from service and is a “specified employee” within the meaning of Section 409A on the date of the separation from service, then to the extent necessary to prevent any accelerated or additional tax under Section 409A, such settlement will be delayed until the earlier of: (a) the date that is six months following the Participant's separation from service and (b) the Participant’s death (the “Delayed Payment Date”) and the accumulated amounts shall be distributed or paid in a lump sum payment on the Delayed Payment Date.

23.3    The Company does not represent that the Award or this Agreement comply with Section 409A and in no event shall the Company be liable for all or any portion of any taxes,

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penalties, interest or other expenses that may be incurred by the Participant on account of non-compliance with Section 409A.

23.4    To the extent that any provision of the Agreement would cause a conflict with the requirements of Section 409A, or would cause the administration of the Agreement to fail to satisfy Section 409A, such provision shall be deemed null and void to the extent permitted by Applicable Law.

24. Entire Agreement . The Plan and this Agreement (including any exhibit hereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and the Participant with respect to the subject matter hereof.

25. Severability . The invalidity or unenforceability of any provision of the Plan or this Agreement shall not affect the validity or enforceability of any other provision of the Plan or this Agreement, and each provision of the Plan and this Agreement shall be severable and enforceable to the extent permitted by law.

26. Governing Law . This Agreement will be construed and interpreted in accordance with the laws of the State of Oklahoma without regard to the conflict of laws provisions thereof.

27. Counterparts . This Agreement may be executed in one or more counterparts, including by way of electronic signature, subject to Applicable Law, each of which shall be deemed an original and all of which together will constitute one instrument.

28. Administration of Award; Acceptance . As a condition of receiving this Award, the Participant agrees that the Committee shall have full and final authority to construe and interpret the Plan and this Agreement, and to make all other decisions and determinations as may be required under the Plan or this Agreement as they may deem necessary or advisable for administration of the Plan or this Agreement, and that all such interpretations, decisions and determinations shall be final and binding on the Participant, the Company and all other interested persons. Any dispute regarding the interpretation of this Agreement shall be submitted by the Participant or the Company to the Committee for review. The resolution of such dispute by the Committee shall be final and binding on the Participant and the Company. Day-to-day authority and responsibility has been delegated to the Company’s ONE Gas, Inc. Benefits Committee and its authorized representatives, and all actions taken thereby shall be entitled to the same deference as if taken by the Committee itself.

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The Participant hereby acknowledges receipt of this Agreement, the Notice of Performance Unit Award and Agreement dated February 16, 2016, and a copy of the Plan. Participant agrees to be bound by all of the provisions set forth in this Agreement and the Plan and acknowledges that there may be adverse tax consequences upon the vesting or settlement of the Performance Units or disposition of the underlying Shares and that Participant has been advised to consult a tax advisor prior to such vesting, settlement or disposition. Participant and accepts the Award under the terms and conditions stated in this Agreement, subject to all terms and provisions of the Plan, by electronic acceptance of the grant.

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Exhibit A
Performance Unit Performance Goal
2016-2019 Performance Period

Subject to the terms of the Agreement, Participant shall vest in a percentage of the Target Award (including any Dividend Equivalents) at the end of the Performance Period based on the Company’s ranking for Total Stockholder Return against the ONE Gas Peer Group listed in Exhibit C, all as determined by the Committee in its sole discretion.

	
		
ONE Gas Total Stockholder Return (TSR): vs. ONE Gas Peer Group	
ONE Gas TSR Ranking vs. ONE Gas Peer Group	Percentage of Performance Units Earned	
90 th  percentile and above
75 th  percentile
50 th  percentile
25 th  percentile
Below 25 th  percentile	200%
150%
100%
50%
0%	

If ONE Gas’s TSR ranking at the end of the Performance Period is between the stated percentile levels in the above table, the percentage of the Performance Units earned will be interpolated between the earning levels. No Performance Units are earned if ONE Gas’s TSR ranking at the end of the Performance Period is below the 25 th percentile.

Exhibit B
Illustration of Hypothetical 2016-2019 Performance Period
Performance Unit Award Calculation
Illustration assumes 500 Performance Units Granted in February 2016

	
	
Total Stockholder Return (TSR) vs. ONE Gas Peer Group	

Hypothetical 2016-2019 ONE Gas TSR Ranking = 40 th  percentile

A 40 th  percentile TSR ranking earns 80% of Performance Units granted (i.e., 500 units)
as interpolated between 50% and 100% from Table A (see chart below)

400 Performance Units earned*

	
	
Total Performance Units Earned	

400 Performance Units

400* Performance Units earned out of 500 units granted = 80% “earn-out”
[80% of 500 shares paid and distributed in the form of Shares]

* In addition, applicable Dividend Equivalents will be added with an 80% “earn-out”.

Exhibit C

2016-2019 ONE GAS TSR Peer Group

	
						
Company Name	Sym	 	 	 	 	

 	 	 	 	 	 	

 	 	 	 	 	 	

 	 	 	 	 	 	

 	 	 	 	 	 	

In the event that any of the Peer Group companies are not available for performance comparison either by going out of business, being sold, being merged into another company or any other reason, then that company will be dropped from the list and the performance comparison will be made with the remaining Peer Group companies.

Exhibit D

ONE GAS, Inc. Equity Compensation Plan
Performance Unit Deferral Election

INSTRUCTIONS: This Deferral Election must be completed and returned to [CONTACT] at ONE Gas, Inc. no later than August 17, 2018 (the “Election Deadline”). This election becomes irrevocable as of the Election Deadline; provided, however, this election shall only become effective to the extent permitted by Section 409A.

This Election is made by the undersigned Participant pursuant to the terms of the ONE GAS, Inc. Equity Compensation Plan (the “Plan”) and that certain Performance Unit Award Agreement issued to me under the Plan on the 16th day of February, 2016 (the “Agreement”). Capitalized terms that are used but not defined herein have the meanings set forth in the Agreement.

1.      Irrevocable Elections as to the Time and Form of Payment

I hereby irrevocably elect to defer the payment and my receipt of all Performance Units, Shares and cash that I may become entitled to receive pursuant to the Agreement (the “Deferred Amounts”) from the regularly scheduled time of payment set forth in Section 6 of the Agreement until a later date as follows:

A.     Specified Time of Payment Election ( Put initials by your choice)

___    I elect to have the Deferred Amounts deferred and paid to me on the later of (i) the date of my separation from service as an employee of the Company, or (ii) [________, 20__] in the form specified below.

___    I elect to have the Deferred Amounts deferred and paid to me on the date of my separation from service as an employee of the Company in the form specified below.

B.     Form of Payment Election (Put initials by your choice)

___     I elect to receive the Deferred Amounts in a single lump sum payment.

____    I elect to receive the Deferred Amounts in ______ (specify 2, 3, 4 or 5) equal annual installments commencing on the Specified Time of Payment that I have elected in Part A above, until fully paid. The number of Shares or cash received in each installment will equal the number and amount, respectively, that have not been paid as of the date immediately preceding the installment payment date, divided by the number of installments remaining to be paid as of the date immediately preceding the installment payment date. The resulting number shall

be rounded down to the next whole number, except that the final installment shall be rounded up to the next whole number.

C.     Election in the Event of Death (Put initials by your choice)

___    In the event of my death prior to, or after, the Specified Time of Payment that I have elected above, I elect to have my named beneficiaries (or my estate, if I do not have any designated beneficiaries) receive payment and transfer of the Deferred Amounts in a single lump sum within 60 days following my death.

___    In the event of my death prior to, or after, the Specified Time of Payment that I have elected above, I elect to have my named beneficiaries (or my estate, if I do not have any designated beneficiaries) receive payment and transfer of the Deferred Amounts in ______ ( specify 2, 3, 4 or 5 ) equal annual installments commencing within 60 days following my death, until fully paid. The number of Shares or cash received in each installment will equal the number and amount, respectively, that have not been paid as of the date immediately preceding the installment payment date, divided by the number of installments remaining to be paid as of the same date. The resulting number shall be rounded down to the next whole number, except that the final installment shall be rounded up to the next whole number.

D.    Change in Ownership or Control (Mandatory Distribution)

Notwithstanding the above elections, if a Change in Ownership or Control (within the meaning of Section 409A) occurs prior to the full distribution of the Deferred Amounts, all Deferred Amounts that have not been paid and transferred will be paid and transferred on the date of the Change in Ownership or Control. In the event Shares no longer exist at the time of payment and transfer, each of the deferred Performance Units shall be converted in a manner that is consistent with the manner in which Shares held by shareholders of the Company were treated with respect to the Change in Ownership or Control.

2.      Additional Terms

A.	Unforeseeable Emergency . You may request an accelerated payment of all or a portion of the Deferred Amounts if you experience an Unforeseeable Emergency (as defined in the Plan), subject to the requirements set forth in Plan Section 13.5. If approved, payment shall be made in a single lump sum within 90 days after the approval date.	

B.	Specified Employee . If you become entitled to a distribution on account of a separation from service and you are “specified employee” (within the meaning of Section 409A) on the date of your separation from service, payment of all or a portion of your Deferred zAmounts may be delayed in accordance with Plan Section 13.4.	

		
C.	Re-deferrals and Changing the Form of Payment . You may, at the Committee’s discretion, be permitted to make a re-deferral election with respect to the amounts deferred hereunder in accordance with Plan Section 13.3.	

D.	Withholding . You will be required to satisfy any tax withholding obligations relating to the Deferred Amounts, and delivery of the Shares or cash will be conditional upon your satisfaction of such obligations.	
 
3.      Acknowledgment

By executing this Election, I acknowledge that:

A.	I have read the terms of the Plan, the Agreement and this Election and agree to all the terms and conditions.	
		
B.	I understand that any amounts that I defer hereunder are unfunded and unsecured and subject to the claims of the Company’s creditors in the event of the Company’s insolvency.	
		
C.	I understand that the Plan, the Agreement and this Election are intended to comply with Section 409A and that they will be interpreted accordingly. However, I understand that the Company will have no liability with respect to any failure to comply with Section 409A.	
		
D.	I understand that this Election will become irrevocable as of the Election Deadline.	
		
E.	I have consulted with my own tax advisor regarding the tax consequences of participating in the Plan and making this election.	

I hereby make this election as of this ___ day of ____, 20__.

_____________________________________
Participant Signature

_____________________________________
Print Participant’s Name

_____________________________________
Employee ID Number

Copy received this ____ day of ________, 20__,

______________________________________
For the Committee

Exhibit 10.25

ONE GAS, INC.
RESTRICTED UNIT AWARD AGREEMENT
This Restricted Unit Award Agreement (this “Agreement”) is made and entered into as of February 16, 2016 (the “Grant Date”) by and between ONE Gas, Inc., an Oklahoma corporation (the “Company”) and [EMPLOYEE NAME] (the “Participant”).
WHEREAS , the Company has adopted the ONE Gas, Inc. Equity Compensation Plan (the “Plan”) pursuant to which Restricted Unit Awards may be granted; and
WHEREAS , the Committee has determined that it is in the best interests of the Company and its shareholders to grant the Restricted Unit Award provided for herein.
NOW, THEREFORE, the parties hereto, intending to be legally bound, agree as follows:

1.	Grant of Restricted Units .	

1.1    The Company hereby grants to the Participant an award consisting of [NUMBER] Restricted Units (“Restricted Units” or the “Award”) on the terms and conditions set forth in this Agreement, the Notice of Restricted Unit Award and Agreement dated February 16, 2016, a copy of which is attached hereto and incorporated herein by reference, and the Plan. Each Restricted Unit represents the right to receive one share of the Company’s common stock (“Share”) or, at the Company’s option, an amount of cash as set forth in Section 6.3, in either case, at the times and subject to the conditions set forth herein. Capitalized terms that are used but not defined herein have the meanings set forth in the Plan.

1.2    The Restricted Units shall be credited to a separate account maintained for the Participant on the books and records of the Company (the “Account”). All amounts credited to the Account shall continue for all purposes to be part of the general assets of the Company.

2. Consideration . The Award is granted in consideration of the Participant’s continued employment with the Company.

3. Vesting .

3.1     General . Subject to Participant’s continuous employment with the Company during the period beginning on the Grant Date and ending on February 18, 2019 (the “Restricted Period”) and subject to the terms of this Agreement, the Participant will vest in such amounts and at such times as are set forth below:

	
		
Vesting Date	Percentage of Award That Vests	
February 18, 2019	100%	
 	 	
For purposes of this Agreement, employment with any Subsidiary of the Company shall be treated as employment with the Company. Likewise, a termination of employment shall not be deemed to occur by reason of a transfer of employment between the Company and any Subsidiary.
Restricted Units that vest pursuant to the terms of this Agreement, including Sections 3.2 and 3.3 below, are referred to as “Vested Units” and the date upon which the Restricted Units vest is referred to as a “Vesting Date.” Unless and until the Restricted Units have vested, Participant will have no right to receive any Shares subject thereto. Prior to the actual delivery of any Shares, the Award will represent an unsecured obligation of the Company, payable only from the Company’s general assets.

3.2     Termination of Employment .

(a) If the Participant's employment with the Company is terminated prior to the end of the Restricted Period by the Company without Cause or on account of the Participant’s Retirement, Total Disability or death, the Participant will vest in a pro-rata portion of the Restricted Units as of the Participant’s termination date. The pro-rata portion of the Restricted Units that vest will be determined by multiplying the number of Restricted Units granted hereunder by a fraction, which fraction shall be equal to the number of full months which have elapsed under the Restricted Period at the time of such termination of employment by the number of full months in the Restricted Period. If the Participant’s employment with the Company terminates for any other reason, Participant shall immediately forfeit any and all Restricted Units that have not vested or do not vest on or prior to the Participant’s termination date and neither the Company nor any Subsidiary shall have any further obligations to the Participant under this Agreement. For purposes of this Agreement:

(i) “Cause” will mean any of the following: (i) the Participant’s conviction in a court of law of a felony, or any crime or offense involving misuse or misappropriation of money or property, (ii) the Participant’s violation of any covenant, agreement or obligation not to disclose confidential information regarding the business of the Company (or Subsidiary), (iii) any violation by the Participant of any covenant not to compete with the Company (or Subsidiary), (iv) any act of dishonesty by the Participant which adversely effects the business of the Company (or Subsidiary), (v) any willful or intentional act of the Participant which adversely affects the business of, or reflects unfavorably on the reputation of the Company (or Subsidiary), (vi) the Participant’s use of alcohol or drugs which interferes with the Participant’s duties as an employee of the

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Company (or Subsidiary), or (vii) the Participant’s failure or refusal to perform the specific directives of the Company’s Board, or its officers which directives are consistent with the
scope and nature of the Participant’s duties and responsibilities with the existence and occurrence of all of such causes to be determined by the Company, in its sole discretion; provided, that nothing contained in the foregoing provisions of this Section shall be deemed to interfere in any way with the right of the Company (or Subsidiary), which is hereby acknowledged, to terminate the Participant’s employment at any time without Cause.

(ii) “Retirement” means a voluntary termination of employment of the Participant with the Company by the Participant if at the time of such termination of employment the Participant has both completed five (5) years of service with the Company and attained age fifty (50).

(iii) “Total Disability” means that the Participant is permanently and totally disabled and unable to engage in any substantial gainful activity by reason of a medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than twelve (12) months, and has established such disability to the extent and in the manner and form as may be required by the Committee.

3.3     Change in Control . If a Change in Control occurs prior to the end of the Restricted Period and the Participant is employed by the Company at the time of the Change in Control, but subsequently terminates prior to the end of the Restricted Period based on an involuntary termination (without cause) or a voluntary termination with "good reason" within 24 months of the CIC date, then the Participant shall become one hundred percent (100%) vested in the Award upon the date of the termination due to the Change in Control. Good reason includes:
• Demotion of material reduction of authority or responsibility;
• Material reduction in base salary;
• Material reduction in annual incentive or LTI targets;
• Relocation of greater than 35 miles; or
• Failure of a successor company to assume the change-in-control plan.

Notwithstanding the foregoing, the provisions set forth in the Plan applicable to a Change in Control shall apply to the Award, and in the event of a Change in Control, the Committee, in its sole discretion and to the extent permitted by Section 409A, may take such actions as it deems appropriate pursuant to the Plan. For purposes of this Agreement, the term “Change in Control” shall have the same meaning as provided in the Plan unless the Award is or becomes subject to Code section 409A, in which event “Change in Control” shall have the meaning provided in Code section 409A and the related Treasury Regulations.

4. Transfer Restrictions .

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4.1    Except as provided in Section 4.2, during the Restricted Period and until such time as the Shares underlying the Vested Units have been issued, the Restricted Units, related Shares or the rights relating thereto may not be sold, pledged, assigned, transferred or otherwise disposed of by the Participant in any manner other than by will or by laws of descent and distribution. Except as provided in Section 4.2, any attempt to sell, pledge, assign, transfer or otherwise dispose of the Restricted Units, related Shares or the rights relating thereto shall be wholly ineffective and, if any such attempt is made, the Restricted Units, related Shares or the rights relating thereto will be forfeited by the Participant and all of the Participant's rights to such units or related Shares shall immediately terminate without any payment or consideration by the Company.

4.2    Notwithstanding the foregoing, the Participant may transfer any part or all of the Participant’s rights in the Restricted Units to members of the Participant’s immediate family, or to one or more trusts for the benefit of such immediate family members, or partnerships in which such immediate family members are the only partners if the Participant does not receive any consideration for the transfer. In the event of any such transfer, Restricted Units shall continue to be subject to the same terms and conditions otherwise applicable hereunder and under the Plan immediately prior to transfer, except that such rights shall not be further transferable by the transferee inter vivos , except for transfer back to the Participant. For any such transfer to be effective, the Participant must provide prior written notice thereof to the Committee and the Participant shall furnish to the Committee such information as it may request with respect to the transferee and the terms and conditions of any such transfer. For purposes of this Agreement, “immediate family” shall mean the Participant’s spouse, children and grandchildren.

5. Dividend Equivalents . During the Restricted Period, the Participant's Account shall be credited with an amount equal to all ordinary cash dividends (“Dividend Equivalents”) that would have been paid to the Participant if one Share had been issued on the Grant Date for each Restricted Unit granted to the Participant as set forth in this Agreement. The Dividend Equivalents credited to the Participant’s Account will be deemed to be reinvested in additional Restricted Units and will be subject to the same terms and conditions as the Restricted Units to which they are attributable and shall vest or be forfeited (if applicable) and settled at the same time as the Restricted Units to which they are attributable. Such additional Restricted Units shall also be credited with additional Dividend Equivalents as any further dividends are declared.

6. Settlement of Vested Units; Distribution or Payment .

6.1    Vested Units shall be settled and distributed in Shares (either in book-entry form or otherwise) or, at the Company’s option, paid in an amount of cash as set forth in Section 6.3. All distributions in Shares shall be in the form of whole Shares, and any fractional Share shall be distributed in cash in an amount equal to the value of such fractional Share determined based on the Fair Market Value of a Share on the Vesting Date.

6.2    Subject to Section 9 and Section 22.2, on each Vesting Date or the date of termination due to a Change in Control as described in 3.3, whichever is earlier, the Company

4

shall distribute to the Participant the number of Shares equal to the number of Vested Units within 75 days after the applicable Vesting Date.

6.3    If the Company elects to settle the Participant’s Vested Units in cash, the amount of cash payable with respect to each Vested Unit shall be equal to the Fair Market Value of a Share on the Vesting Date.  

6.4    To the extent that the Participant does not vest in any Restricted Units on or before the end of day of the Restricted Period, all interest in such Restricted Units and any additional Restricted Units attributable to Dividend Equivalents shall be forfeited. The Participant has no right or interest in any Restricted Units that are forfeited.

7. Conditions to Issuance or Transfer of Shares . The issuance and transfer of Shares shall be subject to compliance by the Company and the Participant with all applicable laws, rules and regulations (“Applicable Laws”) and also to such approvals by governmental agencies as may be deemed appropriate to comply with relevant securities laws and regulations. No Shares shall be issued or transferred unless and until any then applicable requirements of Applicable Laws and regulatory agencies have been fully complied with to the satisfaction of the Company and its counsel.

8. Tax Withholding . Participant shall be required to pay to the Company, and the Company shall have the right to deduct from any compensation paid to the Participant pursuant to the Plan, the amount of any required federal, state and local taxes, domestic or foreign, including payroll taxes, in respect of the Award and to take all such other action as the Committee deems necessary to satisfy all obligations for the payment of such withholding taxes. The Company shall have no obligation to issue any Shares to any Participant unless and until the Participant has made arrangements, satisfactory to the Company in its sole discretion, to satisfy the Participant’s tax liability resulting from the vesting or settlement of the Vested Units. The amount of such withholding shall be determined by the Company. The Committee, in its sole discretion, may permit or require the Participant to satisfy any such tax withholding obligation by any of, or a combination of, the following means:

8.1    tendering a cash payment or check payable to the Company.

8.2    authorizing the Company to withhold an amount from any cash amounts otherwise due or to become due from the Company to the Participant.

8.3    authorizing the Company to withhold Shares from the Shares otherwise issuable to the Participant as a result of the vesting of the Restricted Units; provided, however , that no Shares shall be withheld with a value exceeding the minimum amount of tax required to be withheld by Applicable Law.

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8.4    delivering to the Company previously owned and unencumbered Shares having a then current Fair Market Value not exceeding the minimum amount of tax required to be withheld by Applicable Law.

9. Rights as Shareholder . Except as otherwise provided in the Agreement, the Participant shall not have any of the rights or privileges of a shareholder with respect to the Shares underlying the Restricted Units unless and until the Restricted Units vest and certificates representing such Shares (which may be in book-entry form) have been issued and recorded on the Company’s records, and delivered to the Participant or to an escrow account for the Participant’s benefit. After such issuance, recordation and delivery, Participant will have the rights of a shareholder of the Company with respect to such Shares, including without limitation, voting rights and the right to receipt of dividends and distributions on such Shares.

10. No Right to Continued Service . Neither the Plan nor this Agreement shall confer upon the Participant to serve as an employee or other service provider of the Company. Further, nothing in the Plan or this Agreement shall be construed to limit the discretion of the Company to terminate the services of the Participant at any time, with or without Cause.

11. Adjustments . In the event of a change in capitalization described in Section 15 of the Plan prior to the end of the Restricted Period, other than a dividend described in Section 5 above, the Restricted Units shall be equitably adjusted or terminated in any manner contemplated by the Plan to reflect the effect of such event or change in the Company’s capital structure in such a way as to preserve the value of the Award.

12. Required Participant Repayment/Reduction Provision . Notwithstanding anything in the Plan or this Agreement to the contrary, all or a portion of the Award made to the Participant under this Agreement is subject to being called for repayment to the Company or reduced in any situation where the Board or a committee thereof determines that fraud, negligence, or intentional misconduct by the Participant was a contributing factor to the Company having to restate all or a portion of its financial statement(s). The Committee may determine whether the Company shall effect any such repayment or reduction: (i) by seeking repayment from the Participant, (ii) by reducing (subject to Applicable Law and the Plan’s terms and conditions or any other applicable plan, program, or arrangement) the amount that would otherwise be awarded or payable to the Participant under the Award, the Plan or any other compensatory plan, program, or arrangement maintained by the Company, (iii) by withholding payment of future increases in compensation (including the payment of any discretionary bonus amount) or grants of compensatory awards that would otherwise have been made in accordance with the Company's otherwise applicable compensation practices, or (iv) by any combination of the foregoing. The determination regarding the Participant’s conduct, and repayment or reduction under this provision shall be within the Committee’s sole discretion and shall be final and binding on the Participant and the Company. The Participant, in consideration of the grant of the Award, and by the Participant's execution of this Agreement, acknowledges the Participant's understanding and agreement to this provision, and hereby agrees to make and allow an immediate and complete repayment or reduction in accordance with this provision in the event of

6

a call for repayment or other action by the Company or Committee to effect its terms with respect to the Participant, the Award and/or any other compensation described herein.

13. Company Policies . The Participant agrees that the Award will be subject to any applicable insider trading policies, retention policies and other policies that may be implemented by the Board, from time to time.

14. Participant Undertaking . The Participant agrees to take whatever additional actions and execute whatever additional documents the Company may in its reasonable judgment deem necessary or advisable in order to carry out or effect one or more of the obligations or restrictions imposed on the Participant pursuant to the terms of this Agreement. It is intended by the Company that the Plan and Shares covered by the Award are to be registered under the Securities Act of 1933, as amended, prior to the grant date; provided that in the event such registration is for any reason not effective for such Shares, the Participant agrees that all Shares acquired pursuant to the grant will be acquired for investment and will not be available for sale or tender to any third party.

15. Beneficiary . The Participant may designate a Beneficiary to receive any rights of the Participant which may become vested in the event of the Participant’s death under procedures and in the form established by the Committee; and in the absence of such designation of a Beneficiary, any such rights shall be deemed to be transferred to the Participant’s estate.

16. Notices . Any notice required to be delivered to the Company under this Agreement shall be in writing and addressed to the Vice President of Human Resources of the Company at the Company's principal corporate offices. Any notice required to be delivered to the Participant under this Agreement shall be in writing and addressed to the Participant at the Participant's address as shown in the records of the Company. Either party may designate another address in writing (or by such other method approved by the Company) from time to time. Any notice shall be delivered by hand, sent by telecopy or enclosed in a properly sealed envelope addressed as stated above, registered and deposited, postage prepaid, in a post office regularly maintained by the United States Postal Service.

17. Incorporation of the Plan; Conflicts . The Restricted Units and the Shares issued to Participant hereunder are subject to the terms and conditions set forth in this Agreement and the Plan, which is incorporated herein by reference. In the event of any inconsistency between (1) the Plan and this Agreement, the Plan will control, or (2) the resolutions and records of the Board or Committee and this Agreement, the resolutions and records of the Board or Committee will control.

18. Successors and Assigns . The Company may assign any of its rights under this Agreement, and this Agreement will be binding upon and inure to the benefit of the Company’s successors and assigns. Subject to the restrictions on transfer set forth herein and the Plan, this Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto.

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19. No Impact on Other Benefits . The Company does not intend for the value of the Award or any Vested Units to be included in the Participant’s normal or expected compensation for purposes of calculating any severance, retirement, welfare, insurance or similar employee benefit; provided, however , that if there is any inconsistency between this Agreement and the terms of another benefit plan, the benefit plan document will control.

20. Discretionary Nature of Plan . The Plan is discretionary and may be amended, cancelled or terminated by the Board at any time, in its discretion. The grant of the Restricted Units in this Agreement does not create any contractual right or other right to receive any Restricted Units or other awards in the future. Future awards, if any, will be at the Committee’s sole discretion. Any amendment, modification, or termination of the Plan shall not constitute a change or impairment of the terms and conditions of the Participant's employment with the Company.

21. Amendment . In accordance with the Plan, the Committee may amend or otherwise modify, suspend, discontinue or terminate this Agreement at any time, prospectively or retroactively.

22. Section 409A .

22.1    This Award and Agreement is intended to comply with Section 409A or an exemption thereunder and shall be construed and interpreted in a manner that is consistent with the requirements for avoiding additional taxes or penalties under Section 409A. Notwithstanding any other provision of the Agreement, any distributions or payments due hereunder may only be made upon an event and in a manner that complies with Section 409A or an applicable exemption. Any distributions or payments due hereunder upon a termination of employment shall only be made upon a "separation from service" as defined in Section 409A. The right to a series of installment payments under this Agreement shall be treated as a right to a series of separate payments. In no event may the Participant, directly or indirectly, designate the calendar year of settlement, distribution or payment.

22.2    If an Award is subject to Section 409A and Participant becomes entitled to settlement of the Award on account of a separation from service and is a “specified employee” within the meaning of Section 409A on the date of the separation from service, then to the extent necessary to prevent any accelerated or additional tax under Section 409A, such settlement will be delayed until the earlier of: (a) the date that is six months following the Participant's separation from service and (b) the Participant’s death (the “Delayed Payment Date”) and the accumulated amounts shall be distributed or paid in a lump sum payment on the Delayed Payment Date.

22.3    The Company does not represent that the Award or this Agreement comply with Section 409A and in no event shall the Company be liable for all or any portion of any taxes, penalties, interest or other expenses that may be incurred by the Participant on account of non-compliance with Section 409A.

8

22.4    To the extent that any provision of the Agreement would cause a conflict with the requirements of Section 409A, or would cause the administration of the Agreement to fail to satisfy Section 409A, such provision shall be deemed null and void to the extent permitted by Applicable Law.

23. Entire Agreement . The Plan and this Agreement (including any exhibit hereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and the Participant with respect to the subject matter hereof.

24. Severability . The invalidity or unenforceability of any provision of the Plan or this Agreement shall not affect the validity or enforceability of any other provision of the Plan or this Agreement, and each provision of the Plan and this Agreement shall be severable and enforceable to the extent permitted by law.

25. Governing Law . This Agreement will be construed and interpreted in accordance with the laws of the State of Oklahoma without regard to the conflict of laws provisions thereof.

26. Counterparts . This Agreement may be executed in one or more counterparts, including by way of electronic signature, subject to Applicable Law, each of which shall be deemed an original and all of which together will constitute one instrument.

27. Administration of Award; Acceptance. As a condition of receiving this Award, the Participant agrees that the Committee shall have full and final authority to construe and interpret the Plan and this Agreement, and to make all other decisions and determinations as may be required under the Plan or this Agreement as they may deem necessary or advisable for administration of the Plan or this Agreement, and that all such interpretations, decisions and determinations shall be final and binding on the Participant, the Company and all other interested persons. Any dispute regarding the interpretation of this Agreement shall be submitted by the Participant or the Company to the Committee for review. The resolution of such dispute by the Committee shall be final and binding on the Participant and the Company. Day-to-day authority and responsibility has been delegated to the Company’s Benefit Plan Administration Committee and its authorized representatives, and all actions taken thereby shall be entitled to the same deference as if taken by the Committee itself.

The Participant hereby acknowledges receipt of this Agreement, the Notice of Restricted Unit Award and Agreement dated February 16, 2016, and a copy of the Plan. Participant agrees to be bound by all of the provisions set forth in this Agreement and the Plan and acknowledges that there may be adverse tax consequences upon the vesting or settlement of the Restricted Units or disposition of the underlying Shares and that Participant has been advised to consult a tax advisor prior to such vesting, settlement or disposition. Participant and accepts the Award under the terms and conditions stated in this Agreement, subject to all terms and provisions of the Plan, by electronic acceptance of the grant.

9

Exhibit 12.1

ONE Gas, Inc
Computation of Ratio of Earnings to Fixed Charges
(in thousands)

																					
( Unaudited )	2015	 	2014	 	2013	 	2012	 	2011	 	
 	 	 	 	 	 	 	 	 	 	 	
Fixed charges, as defined:	 	 	 	 	 	 	 	 	 	 	
Interest on long-term debt	$	47,170		 	$	48,380		 	$	62,635		 	$	62,088		 	$	55,848		 	
Interest on lease agreements	1,673		 	1,661		 	1,602		 	1,601		 	1,529		 	
Total fixed charges	48,843		 	50,041		 	64,237		 	63,689		 	57,377		 	
Earnings before income taxes	192,009		 	178,128		 	161,467		 	156,360		 	142,762		 	
Earnings available for fixed charges	$	240,852		 	$	228,169		 	$	225,704		 	$	220,049		 	$	200,139		 	
Ratio of earnings to fixed charges	4.93		x	4.56		x	3.51		x	3.46		x	3.49		x	

Exhibit 21.1

SUBSIDIARIES OF ONE Gas, Inc.

		
1.	ONE Gas Properties, L.L.C., an Oklahoma limited liability company.	

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Forms S-3 (No. 333-194468 and No. 333-196743) and S-8 (No. 333-205099 and No. 333-193690) of ONE Gas, Inc. of our report dated February 18, 2016, relating to the financial statements and the effectiveness of internal control over financial reporting of ONE Gas, Inc., which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Tulsa, Oklahoma
February 18, 2016

Exhibit 31.1

Certification

I, Pierce H. Norton II, certify that:

I have reviewed this annual report on Form 10-K of ONE Gas, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;	
		
b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;	
		
c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and	
		
d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and	

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and	
		
b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.	

Date: February 18, 2016

		
 	/s/ Pierce H. Norton II	
 	Pierce H. Norton II	
 	Chief Executive Officer	

Exhibit 31.2

Certification

I, Curtis L. Dinan, certify that:

I have reviewed this annual report on Form 10-K of ONE Gas, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;	
		
b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;	
		
c)	Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and	
		
d)	Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and	

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and	
		
b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.	

Date: February 18, 2016

		
 	/s/ Curtis L. Dinan	
 	Curtis L. Dinan	
 	Chief Financial Officer	

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONE Gas, Inc. (the “Registrant”) for the period ending December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Pierce H. Norton II, Chief Executive Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)	the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and	

(2)	the information contained in the Report fairly presents, in all material respects, the financial condition of the Registrant and results of operations of the Registrant.	

/s/ Pierce H. Norton II
Pierce H. Norton II
Chief Executive Officer

February 18, 2016

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONE Gas, Inc. and will be retained by ONE Gas, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

Exhibit 32.2

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ONE Gas, Inc. (the “Registrant”) for the period ending December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Curtis L. Dinan, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)	the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and	

(2)	the information contained in the Report fairly presents, in all material respects, the financial condition and the results of operations of the Registrant.	

/s/ Curtis L. Dinan
Curtis L. Dinan
Chief Financial Officer

February 18, 2016

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to ONE Gas, Inc. and will be retained by ONE Gas, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.