FORM 3
        	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
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                      	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940	                      	

1. Name and Address of Reporting Person *

FILSINGER TODD W.	2. Date of Event Requiring Statement (MM/DD/YYYY)
5/2/2008 
	3. Issuer Name and Ticker or Trading Symbol

CALPINE CORP [CPN]	
(Last)        (First)        (Middle)

CALPINE CORPORATION, 717 TEXAS AVENUE, STE. 1000	4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
Interim COO /	
(Street)

HOUSTON, TX 77002       

(City)              (State)              (Zip)	5. If Amendment, Date Original Filed (MM/DD/YYYY)

	6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person	

Table I - Non-Derivative Securities Beneficially Owned	
1.Title of Security
(Instr. 4)	2. Amount of Securities Beneficially Owned
(Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)	4. Nature of Indirect Beneficial Ownership
(Instr. 5)	

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)	
1. Title of Derivate Security
(Instr. 4)	2. Date Exercisable and Expiration Date
(MM/DD/YYYY)	3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)	6. Nature of Indirect Beneficial Ownership
(Instr. 5)	
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares				

Explanation of Responses:	

Remarks:
No securities are beneficially owned.	
No securities are beneficially owned.	

Reporting Owners	
Reporting Owner Name / Address	Relationships	
	Director	10% Owner	Officer	Other	
FILSINGER TODD W.
CALPINE CORPORATION
717 TEXAS AVENUE, STE. 1000
HOUSTON, TX 77002			Interim COO		

Signatures		
/s/ Gregory L. Doody by Power of Attorney		5/12/2008	
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).	
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.	

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS , that the undersigned hereby constitutes and appoints Gregory Doody his true and lawful attorney-in-fact to:

(1)           execute for and on behalf of the undersigned, in the undersigned’s capacity as an officer and/or director of Calpine Corporation (the “Company”), any and all Forms 3, 4 and 5 required to be filed by the undersigned in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended (the “1934 Act”), and the rules thereunder;

(2)           do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute and such Forms 3, 4 or 5 and timely file each form with the United States Securities and Exchange Commission and any stock exchange or similar authority; and

(3)           take and other action of any type whatsoever in connection with the foregoing which, in the opinion of either such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by either such attorney-in-fact on behalf of the undersigned, pursuant to this attorney-in-fact may approve in his/her discretion.

The undersigned hereby grants to such attorney-in-fact, and any one of them, full power and authority to do and perform all and every act and thing whatsoever requisite, necessary, and proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes and the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or her substitute or substitutes, shall lawfully do or cause to be done by virtue of the Power of Attorney and the rights and powers herein granted.  The undersigned acknowledges that none of such attorneys-in-fact, in serving in such capacity at the request of the undersigned, is hereby assuming, nor is the Company hereby assuming, any of the undersigned’s responsibilities to comply with Section 16 of the 1934 Act.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned’s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF , the undersigned has caused this Power of Attorney to be executed as of this 13th day of September, 2007.

 	/s/   Todd W. Filsinger	 	
 	Todd W. Filsinger