THIRD AMENDMENT TO
                  SECOND AMENDED AND RESTATED CREDIT AGREEMENT


     THIS THIRD AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT, dated
as of May 9, 2002 (herein called this "Amendment"), is entered into by and among
CALPINE CORPORATION,  a Delaware corporation (herein called the "Company"),  the
various  financial  institutions  listed  on  the  signature  page  hereof  (the
"Lenders") and THE BANK OF NOVA SCOTIA, as administrative  agent for the Lenders
(herein, in such capacity, called the "Agent").

                              W I T N E S S E T H:
                              - - - - - - - - - -

     WHEREAS,  the Company,  the Lenders and the Agent have  heretofore  entered
into a certain Second Amended and Restated Credit Agreement, dated as of May 23,
2000,  as amended by that certain First  Amendment and Waiver to Second  Amended
and  Restated  Credit  Agreement,  dated as of April 19,  2001 and that  certain
Second  Amendment to Second Amended and Restated Credit  Agreement,  dated as of
March 8, 2002 (herein called the "Credit Agreement"); and

     WHEREAS,  the  Company,  the  Lenders and the Agent now desire to amend the
Credit Agreement in certain respects, as hereinafter provided,

     WHEREAS,   the  Company  has  requested  that  the  Lenders  waive  certain
provisions  of the Loan  Documents,  and  subject  to the terms  and  provisions
hereinafter set forth, the Lenders have agreed to do so;

     NOW, THEREFORE,  in consideration of the premises and the mutual agreements
herein  contained,  the  Company,  the  Lenders  and the Agent  hereby  agree as
follows:

     SECTION 1. The Credit Agreement is hereby amended as follows:

     (a) Clause (a) of Section 8.2.2 of the Credit  Agreement is hereby  amended
by adding the following clause immediately prior to the end thereof:

     "and any Indebtedness evidenced by promissory notes pledged pursuant to the
     Note  Pledge  Agreement  (as  such  term  is  defined  in the  2002  Credit
     Agreement)."

     (b) Clause (a) of Section 8.2.3 of the Credit  Agreement is hereby  amended
by adding the following proviso immediately prior to the end thereof:

     ";  provided,  however,  that all proceeds from any  Incremental  Dedicated
     Assets  (as such term is  defined in the 2002  Credit  Agreement)  shall be
     applied as more particularly set forth in the 2002 Credit Agreement."

     SECTION 2. The  effectiveness of this Amendment is conditioned upon receipt
by the  Agent  of all  the  following  documents,  each in  form  and  substance
satisfactory to the Agent:

          (i) This Amendment duly executed by the Company,  Required Lenders and
     Calpine Gilroy; and

          (ii)  Such  other   documents  as  the  Agent  shall  have  reasonably
     requested.

     SECTION 3. This Amendment  shall be deemed to be an amendment to the Credit
Agreement,  and the Credit  Agreement,  as amended hereby,  is hereby  ratified,
approved and confirmed in each and every  respect.  All references to the Credit
Agreement  in  any  other  document,  instrument,  agreement  or  writing  shall
hereafter be deemed to refer to the Credit Agreement as amended hereby.

     SECTION 4. THIS  AMENDMENT  SHALL BE A CONTRACT  MADE UNDER AND GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK. All
obligations  of the Company  and rights of the  Lenders and the Agent  expressed
herein  shall be in  addition  to and not in  limitation  of those  provided  by
applicable  law.  Whenever  possible each provision of this  Amendment  shall be
interpreted  in such manner as to be effective and valid under  applicable  law,
but if any provision of this  Amendment  shall be prohibited by or invalid under
applicable  law,  such  provision  shall be  ineffective  to the  extent of such
prohibition or invalidity,  without invalidating the remainder of such provision
or the remaining provisions of this Amendment.

     SECTION 5. This  Amendment  may be executed in any number of  counterparts,
all of which taken together shall  constitute one and the same  instrument,  and
any party hereto may execute this Amendment by signing one or more counterparts.

     SECTION 6. This  Amendment  shall be binding upon the Company,  the Lenders
and the Agent and their  respective  successors and assigns,  and shall inure to
the benefit of the  Company,  the Lenders and the Agent and the  successors  and
assigns of the Lenders and the Agent.

     SECTION 7. THE COMPANY  HEREBY  KNOWINGLY,  VOLUNTARILY  AND  INTENTIONALLY
WAIVES  ANY RIGHT TO A TRIAL BY JURY IN ANY ACTION OR  PROCEEDING  TO ENFORCE OR
DEFEND  ANY RIGHTS  UNDER THIS  AMENDMENT  OR UNDER ANY  AMENDMENT,  INSTRUMENT,
DOCUMENT  OR  AGREEMENT  DELIVERED  OR WHICH MAY IN THE FUTURE BE  DELIVERED  IN
CONNECTION  HEREWITH  OR  ARISING  FROM ANY  BANKING  RELATIONSHIP  EXISTING  IN
CONNECTION  WITH THIS  AMENDMENT,  AND AGREES THAT ANY SUCH ACTION OR PROCEEDING
SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY.



     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be
executed by their  respective  officers  thereunto duly authorized as of the day
and year first above written.

                                         CALPINE CORPORATION


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         THE BANK OF NOVA SCOTIA, as Agent and
                                         Lender


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         BAYERISCHE LANDESBANK GIROZENTRALE


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         CIBC INC.


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         CREDIT SUISSE FIRST BOSTON, NEW YORK
                                         BRANCH


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         BAYERISCHE HYPO-UND VEREINSBANK AG


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         ING (U.S.) CAPITAL LLC


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         TORONTO DOMINION (TEXAS) INC.


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         UNION BANK OF CALIFORNIA, N.A.


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         BANK OF AMERICA, N.A.


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         CREDIT LYONNAIS NEW YORK BRANCH


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         DRESDNER BANK AG, NEW YORK AND GRAND
                                         CAYMAN BRANCHES


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         FLEET NATIONAL BANK


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


                                         FORTIS CAPITAL CORP.


                                         By:____________________________________
                                         Name:__________________________________
                                         Title:_________________________________


The undersigned has reviewed and approved
the Amendment and confirms that its obligations
under the Assignment Agreement remain in full
force and effect.

CALPINE GILROY COGEN, L.P.,
a Delaware limited partnership

By:   Calpine Gilroy 1, Inc.,
      a Delaware corporation,
      its general partner


      By:________________________________
      Title:

Address:     50 W. San Fernando St.
               San Jose, CA 95113

Attention:   Vice President - Finance

Telecopier:  408-995-0505