EXHIBIT 10.30

                              AMENDMENT NO. 1 UNDER
                         Credit and guarantee agreement

               THIS AMENDMENT NO. 1 UNDER CREDIT AND GUARANTEE  AGREEMENT  (this
"Amendment") is made as of the 12th day of September, 2003, by and among CALPINE
CONSTRUCTION  FINANCE  COMPANY,   L.P.,  a  Delaware  limited  partnership  (the
"Company"),  CALPINE  HERMISTON,  LLC,  a  Delaware  limited  liability  company
("Calpine LLC"), CPN HERMISTON,  LLC, a Delaware limited liability company ("CPN
LLC"),  and HERMISTON  POWER  PARTNERSHIP,  an Oregon general  partnership  (the
"Hermiston  Partnership"  and,  together  with  Calpine  LLC  and CPN  LLC,  the
"Guarantors"),  the lenders  party  hereto (the  "Lenders"),  and GOLDMAN  SACHS
CREDIT PARTNERS L.P., as  administrative  agent (together with its successors in
such  capacity,  the  "Administrative  Agent") and as sole lead  arranger,  sole
bookrunner and syndication agent (in such capacity, the "Sole Lead Arranger").

                                    RECITALS

               WHEREAS,   the  Company,   the  Guarantors,   the  Lenders,   the
Administrative  Agent  and the Sole  Lead  Arranger  entered  into a Credit  and
Guarantee  Agreement,  dated as of August  14,  2003 (as  amended  and as may be
further  amended from time to time, the "Credit  Agreement"),  pursuant to which
the  Company  borrowed,  on a  non-recourse  basis as  described  in the  Credit
Agreement,  $385,000,000 in aggregate  principal amount of First Priority Senior
Secured Institutional Term Loans due 2009 (the "Term Loans");

               WHEREAS,  the  Company,  the  Guarantors,  the  Lenders  and  the
Administrative Agent now wish to amend the Credit Agreement in certain respects,
as hereinafter provided.

                                    AGREEMENT

               NOW THEREFORE,  in  consideration  of the premises and the mutual
agreements  set  forth,   the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the parties hereto hereby agree as follows:

               1.  Definitions.  Unless  otherwise  defined  herein,  terms used
herein  which are  defined in the  Credit  Agreement  shall have the  respective
meanings assigned to such terms in the Credit Agreement.

               2. Amendment to Section 5.05 (Restricted Payments).  Section 5.05
of the Credit  Agreement is hereby  amended to insert the  following as the last
sentence of such section:

               Notwithstanding   the   foregoing,   the   Company  may
               distribute  to the  direct or  indirect  holders of the
               Company's  Equity  Interests in their  capacity as such
               the net  proceeds  from any  issuance  of  Indebtedness
               incurred pursuant to Section  5.07(b)(iii)  (other than
               Permitted Refinancing Indebtedness incurred pursuant to
               Section  5.07(b)(iii)  to refund,  refinance or replace
               any  Indebtedness   previously   incurred  pursuant  to
               Section 5.07(b)(iii)).



               3.  Current  Lenders.   The   Administrative   Agent  agrees  and
acknowledges  that Appendix A hereto correctly  identifies,  as of the date this
Amendment  becomes  effective in  accordance  with Section 5 hereof,  all of the
Lenders and the aggregate outstanding Term Loans held by each Lender.

               4. Representations and Warranties. The Company and each Guarantor
hereby represents and warrants to each Lender and the Administrative  Agent that
(a) this  Amendment  has been duly  authorized,  executed  and  delivered by the
Company or  Guarantor,  as  applicable,  and  constitutes  its valid and legally
binding obligation, enforceable against it in accordance with its terms, subject
to bankruptcy, insolvency, fraudulent transfer,  reorganization,  moratorium and
similar laws of  generally  applicability  relating to or  affecting  creditors'
rights and to general equity principles;  (b) no Default or Event of Default has
occurred and is continuing under the Credit Agreement; and (c) the execution and
delivery  of  this  Amendment  (i)  does  not  require  any  consent,  approval,
authorization  or order of, or filing with, any  governmental  agency or body or
any court,  except such as have been  obtained or made and are in full force and
effect as of the date  hereof and (ii) will not violate  any  applicable  law or
regulation  or the  charter,  by-laws or other  organizational  documents of the
Company or Guarantor, as applicable,  or any order of any governmental agency or
body, or breach or conflict with any material  agreement to which the Company or
Guarantor,  as applicable,  is a party or by which the Company or Guarantor,  as
applicable, is bound.

               5.  Effectiveness.  This  Amendment  shall become  effective upon
receipt  by the  Administrative  Agent  of duly  executed  counterparts  of this
Amendment  signed on behalf of the Company,  the  Guarantors  and the  Requisite
Lenders.

               6. Continuing Effect of the Credit Agreement. Except as expressly
set forth herein,  this Amendment  shall not by implication or otherwise  limit,
impair,  constitute a waiver of, or otherwise  affect the rights and remedies of
the Lenders,  the Administrative  Agent, the Company or the Guarantors under the
Credit Agreement and shall not alter,  modify, amend or in any way affect any of
the terms,  conditions,  obligations,  covenants or agreements  contained in the
Credit  Agreement,  all of which are  ratified  and affirmed in all respects and
shall  continue  in full force and  effect.  Nothing  herein  shall be deemed to
entitle the Company or the  Guarantors to a consent to, or a waiver,  amendment,
modification  or other  change of, any of the  terms,  conditions,  obligations,
covenants  or  agreements  contained  in the  Credit  Agreement  in  similar  or
different  circumstances.  This Amendment shall apply and be effective only with
respect to the  provisions  of the Credit  Agreement  specifically  referred  to
herein.  After this  Amendment  becomes  effective in accordance  with Section 5
hereof, any reference to the Credit Agreement shall mean the Credit Agreement as
amended and modified hereby.

               7.  Applicable  Law. This Amendment and the right and obligations
of the  parties  hereunder  shall be  governed  by, and shall be  construed  and
enforced in accordance with, the laws of the State of New York without regard to
conflict of laws principles thereof.

               8. Counterparts.  This Amendment may be executed in any number of
counterparts,  each of which when so executed and  delivered  shall be deemed an
original,  but all such  counterparts  together shall constitute but one and the
same  instrument.  The delivery of an

                                      -2-


executed  signature  of this  Amendment by
facsimile  transmission  shall be effective  as delivery of a manually  executed
counterpart hereof.

               9. Headings.  Headings  herein are include herein for convenience
of reference  only and shall not  constitute a part hereof for any other purpose
or be given any substantive effect.



                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      -3-


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


                                      CALPINE CONSTRUCTION FINANCE COMPANY, L.P.


                                      By:           /s/ ZAMIR RAUF
                                         ---------------------------------------
                                         Name:  Zamir Rauf
                                         Title:  Vice President



                                      CALPINE HERMISTON, LLC.


                                      By:           /s/ ZAMIR RAUF
                                         ---------------------------------------
                                         Name:  Zamir Rauf
                                         Title:  Vice President



                                      CPN HERMISTON, LLC


                                      By:           /s/ ZAMIR RAUF
                                         ---------------------------------------
                                         Name:  Zamir Rauf
                                         Title:  Vice President



                                      HERMISTON POWER PARTNERSHIP


                                      By:           /s/ ZAMIR RAUF
                                         ---------------------------------------
                                         Name:  Zamir Rauf
                                         Title:  Vice President



                             [EXECUTIONS CONTINUED]




                                      GOLDMAN SACHS CREDIT PARTNERS L.P.,
                                      as Administrative Agent, Sole Lead
                                      Arranger, Syndication Agent and a Lender


                                      By:           /s/ RT WAGNER
                                         ---------------------------------------
                                         Name:    Robert Wagner
                                         Title: Authorized Signatory








                                      Citadel Jackson Investment Fund Ltd.
                                      By:  Citadel Limited Partnership,
                                              Portfolio Manager
                                      By:  GLB Partners, L.P. its General
                                              Partner
                                      By:  Citadel Investment Group, L.L.C.,
                                              its General Partner
                                      as a Lender


                                      By:       /s/ LEVOYD E. ROBINSON
                                         ---------------------------------------
                                         Name: Levoyd F. Robinson, CFA
                                         Title: Managing Director





                                      CITIBANK, N.A.
                                      as a Lender


                                      By:       /s/ JAMES B. MAXWELL
                                         ---------------------------------------
                                         Name:      James B. Maxwell
                                         Title:     Attorney-in-fact





                                      FIRST DOMINION FUNDING II
                                      as a Lender


                                      By:       /s/ [Illegible]
                                         ---------------------------------------
                                         Name:
                                         Title:



                                      FIRST DOMINION FUNDING III
                                      as a Lender


                                      By:       /s/ [Illegible)
                                         ---------------------------------------
                                         Name:
                                         Title:



                                      ATRIUM
                                      as a Lender


                                      By:       /s/ [Illegible]
                                         ---------------------------------------
                                         Name:
                                         Title:



                                      CSAM I
                                      as a Lender


                                      By:       /s/ [Illegible]
                                         ---------------------------------------
                                         Name:
                                         Title:






                                      CSAM II
                                      as a Lender


                                      By:       /s/ [Illegible]
                                         ---------------------------------------
                                         Name:
                                         Title:



                                      CSAM III
                                      as a Lender


                                      By:       /s/ [Illegible]
                                         ---------------------------------------
                                         Name:
                                         Title:






                                      Manchester Securities Corporation
                                      as a Lender


                                      By:       /s/ ELLIOT GREENBERG
                                         ---------------------------------------
                                         Name:  Elliot Greenberg
                                         Title:  Vice-President






                                      Foothill Income Trust, L.P.
                                      as a Lender


                                      By:  FIT GP, LLC, its general partner

                                      By:       /s/ DENNIS R. ASCHER
                                         ---------------------------------------
                                         Name: Dennis Ascher
                                         Title:  Managing Member






                                      FRANKLIN MUTUAL ADVISERS, LLC
                                      as a Lender


                                      By:       /s/ KATHLEEN PINTARELLI
                                         ---------------------------------------
                                         Name:  Kathleen Pintarelli
                                         Title:  Authorized Signatory






                                      SEMINOLE FUNDING LLC
                                      as a Lender


                                      By:       /s/ ANN E. MORRIS
                                         ---------------------------------------
                                         Name: Ann E. Morris
                                         Title:  Asst Vice President






                                      HBK Master Fund L.P.
                                      as a Lender


                                      By: HBK Investments L.P.
                                          Investment Advisor

                                      By:       /s/ DAVID C. HALEY
                                         ---------------------------------------
                                         Name:  David C. Haley
                                         Title:  Authorized Signatory






                                      ARCHIMEDES FUNDING IV (CAYMAN), LTD.


                                      BY: ING Capital Advisors LLC,
                                          as Collateral Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director



                                      BALANCED HIGH-YIELD FUND II, LTD.


                                      BY: ING Capital Advisors LLC,
                                          as Asset Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director



                                      ENDURANCE CLO I, LTD.


                                      BY: ING Capital Advisors LLC,
                                          as Collateral Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director



                                      SEQUILS-ING I (HBDGM), LTD.


                                      BY: ING Capital Advisors LLC,
                                          as Collateral Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director






                                      ING-ORYX CLO, LTD.


                                      BY: ING Capital Advisors LLC,
                                          as Collateral Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director



                                      NEMEAN CLO, LTD.


                                      By: ING Capital Advisors LLC,
                                          as Investment Manager

                                      By:       /s/ GORDON R. COOK
                                         ---------------------------------------
                                         Name:  Gordon R. Cook
                                         Title: Managing Director






                                      ING PRIME RATE TRUST


                                      By: Aeltus Investment Management, Inc.
                                          as its investment manager

                                      By:       /s/ CHARLES E. LEMIEUX
                                         ---------------------------------------
                                         Name: Charles E. LeMieux, CFA
                                         Title:  Vice President






                                      ING SENIOR INCOME FUND


                                      By: Aeltus Investment Management, Inc.
                                          as its investment manager

                                      By:       /s/ CHARLES E. LEMIEUX
                                         ---------------------------------------
                                         Name: Charles E. LeMieux, CFA
                                         Title:  Vice President






                                      Marathon Special Opportunity Fund
                                      as a Lender


                                      By:       /s/ HILARY PARK
                                         ---------------------------------------
                                         Name: Hilary Park
                                         Title:  Sr Vice President






                                      SOF INVESTMENTS, L.P.
                                      as a Lender


                                      By:       /s/ MARC R. LISKER
                                         ---------------------------------------
                                         Name:  Marc R. Lisker
                                         Title:  General Counsel






                                      Metropolitan West Total Return Bond Fund
                                      as a Lender


                                      By:       /s/ DAVID LIPPMAN
                                         ---------------------------------------
                                         Name: David Lippman
                                         Title:  Managing Director






                                      Metropolitan West High Yield Bond Fund
                                      as a Lender


                                      By:       /s/ DAVID LIPPMAN
                                         ---------------------------------------
                                         Name: David Lippman
                                         Title:  Managing Director






                                      Redwood Capital Management, LLC
                                      as a Lender


                                      By:       /s/ JONATHAN KOLATCH
                                         ---------------------------------------
                                         Name:  Jonathan Kolatch
                                         Title: Principal






                                      COLONIAL FUNDING LLC
                                      as a Lender


                                      By:       /s/ ANN E. MORRIS
                                         ---------------------------------------
                                         Name: Ann E. Morris
                                         Title:  Asst Vice President






                                      Watershed Capital Partners, L.P.
                                      By: WS Partners, L.L.C.
                                      Its General Partner as a Lender


                                      By:       /s/ MERIDEE MOORE
                                         ---------------------------------------
                                         Name: Meridee Moore
                                         Title:  Senior Managing Member






                                      Watershed Capital Institutional
                                      Partners, L.P.
                                      By: WS Partners, L.L.C.
                                      Its General Partner


                                      By:       /s/ MERIDEE MOORE
                                         ---------------------------------------
                                         Name: Meridee Moore
                                         Title:  Senior Managing Member








                                                                      APPENDIX A
                         to Amendment No. 1 under Credit and Guarantee Agreement

                         Lenders and Term Loan Holdings

                                  See attached.