FOURTH AMENDMENT TO
                  SECOND AMENDED AND RESTATED CREDIT AGREEMENT


     THIS FOURTH  AMENDMENT  TO SECOND  AMENDED AND RESTATED  CREDIT  AGREEMENT,
dated as of September 26, 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, that certain Second
Amendment to Second Amended and Restated Credit Agreement,  dated as of March 8,
2002 and that  certain  Third  Amendment to Second  Amended and Restated  Credit
Agreement, dated as of May 9, 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; and

     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.  Subsection  (i) of clause  (b) of  Section  8.2.6 of the Credit
Agreement is hereby amended and restated in its entirety to read as follows:

          "(i) make any  payment  or  prepayment  of  principal  of, or make any
     payment of  interest  on, any Senior  Notes (as such term is defined in the
     2002 Credit  Agreement) or any Subordinated  Debt on any day other than the
     stated date for such payment or  prepayment  set forth in the documents and
     instruments  memorializing any Senior Notes or such  Subordinated  Debt, or
     which would violate the  subordination  provisions of any such Subordinated
     Debt; provided,  that the Borrower may so pay or prepay all or a portion of
     the Senior Notes (as such term is defined in the 2002 Credit  Agreement) if
     either (A) both before and after giving  effect  thereto,  no Default shall
     have occurred or be continuing and there are no Loans outstanding hereunder
     or (B) both before and after giving effect  thereto,  no Default shall have
     occurred and be continuing and the aggregate amount of all such prepayments
     shall not  exceed 50% of  aggregate  Net Equity  Proceeds  received  by the
     Borrower from and after March 8, 2002."

     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 and Required  Lenders;
     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:  /s/ Michael Thomas
                                           -------------------------------------
                                        Name:  Michael Thomas
                                             -----------------------------------
                                        Title:  Senior Vice President - Treasury
                                              ----------------------------------


                                        THE BANK OF NOVA SCOTIA, as Agent and
                                        Lender


                                        By:  /s/ Denis P. O'Meara
                                           ------------------------------------
                                        Name:  Denis P. O'Meara
                                             -----------------------------------
                                        Title:  Managing Director
                                              ----------------------------------


                                        BAYERISCHE LANDESBANK


                                        By:  /s/ C. Stolarski
                                           -------------------------------------
                                        Name:  C. Stolarski
                                             -----------------------------------
                                        Title:  V.P.
                                              ----------------------------------


                                        By:  /s/ C. Wintergerst
                                           -------------------------------------
                                        Name:  C. Wintergerst
                                             -----------------------------------
                                        Title:  V.P.
                                              ----------------------------------


                                        CIBC INC.


                                        By:
                                           -------------------------------------
                                        Name:
                                             -----------------------------------
                                        Title:
                                              ----------------------------------


                                        CREDIT SUISSE FIRST BOSTON, NEW YORK
                                        BRANCH


                                        By:  /s/ James Moran
                                           -------------------------------------
                                        Name:  James Moran
                                             -----------------------------------
                                        Title:  Director
                                              ----------------------------------


                                        By:  /s/ Thomas Murray
                                           -------------------------------------
                                        Name:  Thomas Murray
                                             -----------------------------------
                                        Title:  Directors
                                              ----------------------------------













                                      -2-



                                        BAYERISCHE HYPO-UND VEREINSBANK AG


                                        By:
                                           -------------------------------------
                                        Name:
                                             -----------------------------------
                                        Title:
                                              ----------------------------------


                                        By:
                                           -------------------------------------
                                        Name:
                                             -----------------------------------
                                        Title:
                                              ----------------------------------


                                        ING CAPITAL LLC


                                        By:  /s/ Erwin Thomet
                                           -------------------------------------
                                        Name:  Erwin Thomet
                                             -----------------------------------
                                        Title:  Managing Director
                                              ----------------------------------


                                        By:  /s/ G. Dominick Bellamy, Jr.
                                           -------------------------------------
                                        Name:  G. Dominick Bellamy, Jr.
                                             -----------------------------------
                                        Title:  Director
                                              ----------------------------------


                                        TORONTO DOMINION (TEXAS) INC.


                                        By:  /s/ Mark A. Baird
                                           -------------------------------------
                                        Name:  Mark A. Baird
                                             -----------------------------------
                                        Title:  Vice President
                                              ----------------------------------


                                        UNION BANK OF CALIFORNIA, N.A.


                                        By:  /s/ Bryan Read
                                           -------------------------------------
                                        Name:  Bryan Read
                                             -----------------------------------
                                        Title:  Vice President
                                              ----------------------------------


                                        BANK OF AMERICA, N.A.


                                        By:  /s/ Gabriela Millhorn
                                           -------------------------------------
                                        Name:  Gabriela Millhorn
                                             -----------------------------------
                                        Title:  Principal
                                              ----------------------------------


                                        CREDIT LYONNAIS NEW YORK BRANCH


                                        By:  /s/ Martin C. Livingston
                                           -------------------------------------
                                        Name:  Martin C. Livingston
                                             -----------------------------------
                                        Title:  Vice President
                                              ----------------------------------






                                      -3-


                                        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:
                                              ----------------------------------















































                                      -4-