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 Quarterly Report of Calpine Corporation (the “Company”) on
Form 10-Q for the period ending September 30, 2008, as filed with the
Securities and Exchange Commission on the date hereof (the “Report”), each of
the undersigned does hereby certify, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the
best of his knowledge, based upon a review of the Report:
(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 results of operation of the Company.
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/s/ JACK
A. FUSCO
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/s/ ZAMIR
RAUF
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Jack
A. Fusco
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Zamir
Rauf
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Chief
Executive Officer
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Interim
Executive Vice President and
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Calpine
Corporation
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Interim
Chief Financial Officer
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Calpine
Corporation
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Dated: November 7,
2008
A signed
original of this written statement required by Section 906 has been provided to
Calpine Corporation and will be retained by Calpine Corporation and furnished to
the Securities and Exchange Commission or its staff upon
request.