



                            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,  2002,  as filed  with the
Securities and Exchange  Commission on the date hereof (the "Report"),  I, Peter
Cartwright,  Chairman,  President and Chief Executive Officer of the Company, do
hereby certify,  pursuant to 18 U.S.C.  ss. 1350, as adopted pursuant to ss. 906
of the Sarbanes-Oxley Act of 2002, that, to the best of my 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.



-------------------------
Peter Cartwright
Chairman, President and Chief
Executive Officer
Calpine Corporation
November 14, 2002

