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): March 31, 2005


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

                                    Delaware
                 (State of Other Jurisdiction of Incorporation)

                        Commission file number: 001-12079

                  I.R.S. Employer Identification No. 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 8.01 -- Other Events.


     On March 31, 2005,  Calpine  Corporation filed its Form 10-K for the fiscal
year ended  December  31, 2004  ("10-K").  It is filing this Form 8-K to correct
certain   information  as  reported  in  the  10-K.  We  do  not  believe  these
corrections,  individually or in the aggregate, are material. These errata items
are as follows:

     (a)  In Item 7. Management's Discussion and Analysis of Financial Condition
          and  Results  of  Operations  -  Liquidity  and  Capital  Resources  -
          Off-Balance  Sheet  Commitments,  the Company  stated "We  guarantee $
          billion of the total future minimum lease payments of our consolidated
          subsidiaries  related to our  operating  leases."  The amount that was
          inadvertently  omitted is $1.6 billion; such amount is included in the
          Commercial Commitments table in the same section.

     (b)  On the  Company's  Consolidated  Balance  Sheets,  the Company  states
          "authorized  2,000,000,000  shares  in  2003."  The  "2003"  should be
          "2004."

     (c)  In Item 7. Management's Discussion and Analysis of Financial Condition
          and  Results  of  Operations  -  Liquidity  and  Capital  Resources  -
          Bankruptcy-Remote  Subsidiaries,  the Company has provided disclosures
          pursuant to applicable  transaction  agreements relating to certain of
          its  bankruptcy-remote  subsidiaries.  Certain  of  the  amounts  were
          reported  incorrectly,  however there is no impact on our consolidated
          results (in thousands):


                                                       As Reported   Should Be
                                                       -----------   ----------

Calpine Northbrook Energy Marketing, LLC
Net (loss).........................................    $  (56,167)   $   (6,884)

Power Contract Financing, LLC
Assets.............................................    $1,109,825    $  801,368
Liabilities........................................    $1,245,538    $1,227,028

Calpine Gilroy Cogen, L.P. and Calpine Gilroy 1, Inc.
Assets.............................................    $  438,955    $  468,776
Liabilities........................................    $  253,598    $  127,505

Riverside Energy Center, LLC*
Assets.............................................    $  909,687    $  667,794

Calpine Fox, LLC
Assets.............................................    $  480,685    $  377,705

*Subsidiary name disclosed as "Riverside" in Form 10-K


     (d)  In  Note  29 to  the  Consolidated  Financial  Statements,  "Quarterly
          Consolidated  Financial Data  (unaudited)," in the "2004, As Reported"
          section of the table,  certain of the amounts included in the December
          31 column,  were incorrectly  stated.  All amounts in that part of the
          table  should  match the  December  31 column in the "2004,  Restated"
          section of the table.

     (e)  In  Note  29 to  the  Consolidated  Financial  Statements,  "Quarterly
          Consolidated  Financial Data (unaudited),"  certain earnings per share
          amounts  in  the  "2003,  Restated"  section  for  the  quarter  ended
          September 30, 2003 were incorrectly reported:

                                                       As Reported   Should Be
                                                       -----------   ----------
Diluted earnings per common share:
Income (loss) before discontinued operations and
  dilutive effect of certain securities.................. $ 0.45      $ 0.45
Dilutive effect of certain securities....................  (0.09)      (0.06)
Income (loss) before discontinued operations and
  cumulative effect of a change in accounting principle..   0.36        0.39
Discontinued operations, net of tax......................   0.15        0.12
  Net income (loss)......................................   0.51        0.51

     In  addition,  the captions  "Dilutive  effect of certain  trust  preferred
     securities"  should have been "Dilutive effect of certain  securities." The
     "Restated"  earnings per share amounts were correct for all other reporting
     periods  presented  and the annual  earnings per share  amounts in the 10-K
     Consolidated Financial Statements were correctly reported.






                                   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: April 29, 2005