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): May 10, 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 May 10, 2005, the Registrant  issued the press release  attached hereto
as Exhibit 99.1.



ITEM 9.01 -- FINANCIAL STATEMENTS AND EXHIBITS

(a)  Financial Statements of Businesses Acquired.

     Not  Applicable

(b)  Pro Forma Financial Information.

     Not  Applicable

(c)  Exhibits.

     99.1. Press release, dated May 10, 2005.






                                   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: May 16, 2005






EXHIBIT 99.1.


NEWS RELEASE

                                                        CONTACTS: (408) 995-5115
                                   Media Relations:  Katherine Potter, Ext. 1168
                                    Investor Relations:  Karen Bunton, Ext. 1121


          Calpine Commences $155 Million Preferred Shares Offering and
                    $100 Million Senior Term Loan Refinancing
                          for its Metcalf Energy Center

     (SAN  JOSE,  Calif.)  /PR  Newswire  - First  Call/ May 10,  2005 - Calpine
Corporation's  [NYSE:CPN]  indirect  subsidiary,   Metcalf  Energy  Center,  LLC
(Metcalf  LLC),  intends  to  commence  a  $155  million  offering  of  5.5-Year
Redeemable  Preferred  Shares.  Concurrent  with the  issuance of the  Preferred
Shares,  Metcalf LLC will  refinance,  through a five-year,  $100 Million Senior
Term Loan, an existing $100 million  non-recourse  construction credit facility.
Metcalf  LLC owns  Calpine's  602-megawatt  Metcalf  Energy  Center in San Jose,
Calif.

     The proceeds  from the  offering of the  Redeemable  Preferred  Shares will
ultimately be used as permitted by Calpine's existing bond indentures.  Proceeds
from  the  offering  of the  Senior  Term  Loan  will be used to  refinance  all
outstanding  indebtedness under the existing  construction  credit facility,  to
complete  construction  of the Metcalf  power  plant,  to pay fees and  expenses
related  to the  transaction,  and  as  permitted  by  Calpine's  existing  bond
indentures.

     The  Redeemable  Preferred  Shares  have  not  been  registered  under  the
Securities  Act of 1933,  and may not be  offered in the  United  States  absent
registration  or an applicable  exemption from  registration  requirements.  The
Redeemable Preferred Shares will be offered in a private placement in the United
States under  Regulation D under the  Securities  Act of 1933 and outside of the
United States  pursuant to Regulation S under the Securities  Act of 1933.  This
press release shall not  constitute an offer to sell or the  solicitation  of an
offer to buy.  Securities laws applicable to private placements limit the extent
of information that can be provided at this time.