UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 8-K


                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported): December 22, 2005

                               CALPINE CORPORATION
             (Exact name of registrant as specified in its charter)

                                    Delaware
                 (State or Other Jurisdiction of Incorporation)

                        Commission File Number: 001-12079

                I.R.S. Employer Identification Number: 77-0212977

                           50 West San Fernando Street
                           San Jose, California 95113
                            Telephone: (408) 995-5115
          (Address of principal executive offices and telephone number)

          Check the appropriate  box below if the Form 8-K filing is intended to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

     [ ]  Written communications pursuant to Rule 425 under the Securities Act
          (17 CFR 230.425)

     [ ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act
          (17 CFR 240.14a-12)

     [ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
          Exchange Act (17 CFR 240.14d-2(b))

     [ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
          Exchange Act (17 CFR 240.13e-4(c))






ITEM 1.01 -- ENTRY INTO A MATERIAL AGREEMENT.

     On December 22, 2005,  Calpine  Corporation,  a  Debtor-in-Possession  (the
"Company"),  and certain of its  subsidiaries  named therein  (together with the
Company,  the "Loan Parties"),  entered into a Revolving  Credit,  Term Loan and
Guarantee  Agreement  (the "Credit  Agreement"),  dated as of December 22, 2005,
among the Company,  as borrower,  the other Loan  Parties,  as  guarantors,  the
lenders from time to time party thereto,  Credit Suisse ("CS") and Deutsche Bank
Trust Company Americas ("DB"), as joint administrative agents, joint syndication
agents  and joint  documentation  agents,  and  Deutsche  Bank  Securities  Inc.
("DBSI")  and CS, as joint lead  arrangers  and joint book  runners.  The Credit
Agreement facilities consist of a revolving loan, term loan and letter of credit
facility in an  aggregate  principal  amount not to exceed $2 billion,  which is
broken into a $1.35 billion  first  priority  facility  (comprising a $1 billion
revolving  loan  facility  and a $350  million  term loan  facility)  and a $650
million second priority term loan facility.  DB acts as first priority agent and
CS acts as second priority  agent.  The proceeds of the loans and the letters of
credit are to be used for working capital and other general corporate  purposes,
and to repay certain  indebtedness  associated with an existing  leveraged lease
relating to certain  geothermal  assets  known as The  Geysers and to  reacquire
title to The Geysers (referred to as the "Geysers  Transaction").  The Company's
ability to  utilize  the Credit  Agreement  facilities  is subject to an Interim
Order dated  December 21, 2005,  of the United States  Bankruptcy  Court for the
Southern  District of New York (the  "Bankruptcy  Court") in connection with the
voluntary  petitions  for  reorganization  under Chapter 11 of the United States
Bankruptcy Code (the "Bankruptcy  Code") filed by the Company and the other Loan
Parties  on  December  20,  2005  (such   voluntary   petitions   being  jointly
administered  under the caption "In re Calpine  Corporation,  et al.",  Case No.
05-60200 (BRL)).  The Interim Order provides that the Company may currently draw
up to $500 million of the  revolving  facility and is not  permitted to draw any
portion of the term loan facilities.  The Bankruptcy Court has scheduled a final
hearing for January 25, 2006, to determine  whether to issue an order  approving
the Credit  Agreement.  If the Credit  Agreement is approved,  upon entry of the
Bankruptcy  Court's  order,  the Credit  Agreement  provides  that the full $350
million  first  priority  term  loan  commitment,  the  remaining  $500  million
revolving  commitment and $300 million of the $650 million second  priority term
loan commitment would be available upon the  satisfaction of certain  conditions
as set forth in the Credit Agreement. The Credit Agreement further provides that
the remaining $350 million of the second  priority term loan  commitment is only
permitted to be borrowed substantially concurrently with the consummation of the
Geysers Transaction.

     The maturity date of the  facilities is December 20, 2007.  The Company may
elect to have loans under the facilities  bear interest at (i) a eurodollar rate
(as set forth in the Credit Agreement) or (ii) the greater of (x) the prime rate
established from time to time by DB, in respect of the revolving facility and
the first  priority term facility,  or by CS, in respect of the second  priority
term  facility,  and (y) the  federal  funds rate plus 0.50%,  plus,  for either
eurodollar or base rate loans, the applicable  margin. The applicable margin for
revolving  loans and first  priority term loans is 1.25% for base rate loans and
2.25% for eurodollar loans, and for second priority term loans is 3.50% for base
rate loans and 4.50% for  eurodollar  loans.

     In connection with the execution of the Credit Agreement,  the Company, the
other Loan Parties and DB, as collateral agent, also entered into a Security and
Pledge  Agreement,  dated as of December  22, 2005 (the  "Security  Agreement").
Under  the  Security  Agreement,  (i)  pursuant  to  Section  364(c)(1)  of  the
Bankruptcy  Code, the first priority  facilities are secured by a first priority
lien on and security interest in, and the second priority facilities are secured
by a  second  priority  lien  on and  security  interest  in,  all  present  and
after-acquired property of the Company and the other Loan Parties not subject to
a valid,  perfected and non-avoidable  lien or security interest in existence on
the petition  date or to a valid lien in existence on the petition  date that is
perfected  subsequent  to the  petition  date as permitted  by  Bankruptcy  Code
Section 546(b) and (ii) pursuant to Section  364(c)(3) of the  Bankruptcy  Code,
the facilities are secured by a perfected junior lien on, and security  interest
in, all  present and  after-acquired  property of the Company and the other Loan
Parties that is otherwise subject to a valid,  perfected and non-avoidable  lien
or  security  interest  in  existence  on the  petition  date or a valid lien in
existence on the petition date that is perfected subsequent to the petition date
as permitted by Bankruptcy Code Section 546(b).

     The Credit  Agreement  provides that the loans must be prepaid with the net
cash proceeds from the sale of certain assets in excess of $1 million, excluding
the sale of turbines in an amount up to $200 million and certain  projects in an
amount up to $100  million.  In addition,  the Company may elect to reinvest $50
million of net cash proceeds during the term of the facilities rather than using
them to prepay the loans.  The loans must also be prepaid with net cash proceeds
from  certain  insurance  claims or  condemnation  proceedings,  except that $25
million relating to The Geysers and $150 million relating to any other assets of
the Company  and its  subsidiaries  may be  reinvested  in assets  useful in the
Company's business.  Upon the occurrence of an event of default, the lenders may
terminate their commitments,  declare the loans then outstanding to be forthwith
due and  payable,  require  the  Company  and the  other  Loan  Parties  to cash
collateralize  any  outstanding  letters of credit in an amount equal to 105% of
the face value and exercise  other  remedies at law.  Events of default  include
failure  to pay  interest,  principal  and  other  amounts  when  due;  material
misrepresentations;  any material portion of the Credit Agreement  ceasing to be
valid and  binding on the Company  and the other Loan  Parties;  defaults in the
observance and performance of covenants;  defaults in the payment or performance
of certain post-petition date indebtedness or guarantee  obligations;  dismissal
of the  Chapter  11 cases of the  Company or  another  Loan Party or  conversion
thereof to a case under Chapter 7 of the  Bankruptcy  Code; the entry of certain
orders in the  Bankruptcy  Court;  making  unauthorized  pre-petition  payments;
certain environmental matters; certain ERISA matters;  cross-defaults to certain
other  indebtedness of the Company and its  subsidiaries and a change in control
of the Company.

     The Company,  the other Loan Parties and certain other  subsidiaries of the
Company are  obligated  under the terms of the Credit  Agreement  to comply with
certain covenants,  including restrictions on use of proceeds of loans under the
facilities;  incurrence or  maintenance  of debt;  incurrence or  maintenance of
liens;  creating or maintaining  guarantee  obligations;  fundamental changes to
business;  selling or leasing  assets;  issuance of capital stock and dividends;
limitations on investments,  loans and advances; entering into certain affiliate
transactions; maintaining a required system of cash management; allowing certain
Chapter 11 claims;  capital  expenditures  and other  financial  covenants.  The
Company,  the other Loan Parties and certain other  subsidiaries  of the Company
also  affirmatively  covenant to deliver certain financial  statements and other
information to the lenders; pay certain  obligations;  maintain their existence,
property and insurance; comply with contractual and legal obligations and obtain
ratings for the facilities.  The Company has provided indemnities to the lenders
with respect to certain claims,  other than such claims arising out of the gross
negligence or willful misconduct of an indemnified party.

     Each  of CS,  DB,  DBSI or  their  affiliates  have,  from  time  to  time,
performed,  and may in the future perform,  various financial advisory,  lending
and investment banking services for the Company and its subsidiaries,  for which
they received or will receive customary fees and expenses.


ITEM 2.03 -- CREATION OF A DIRECT FINANCIAL OBLIGATION OR AN OBLIGATION UNDER AN
             OFF-BALANCE SHEET ARRANGEMENT OF A REGISTRANT.

     (a)  The  information  set  forth in Item  1.01  above is  incorporated  by
          reference herein.







                                   SIGNATURES


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                  CALPINE CORPORATION

                                  By:  /s/ Charles B. Clark, Jr.
                                       -------------------------------------
                                       Charles B. Clark, Jr.
                                       Senior Vice President, Controller and
                                       Chief Accounting Officer


Date: December 29, 2005