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 18, 2005


                               CALPINE CORPORATION
                            (A Delaware Corporation)

                        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

     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))




SECTION 1 -- REGISTRANT'S BUSINESS AND OPERATIONS

ITEM 1.01. ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT

     The Board of Directors of Calpine Corporation (the "Company") has approved,
and the Company  and the Rights  Agent have  entered  into,  Amendment  No. 2 to
Rights  Agreement,  dated as of March 18, 2005 (the  "Amendment"),  amending the
Company's Amended and Restated Rights Agreement, dated as of September 19, 2001,
as amended by Amendment  No. 1 to Rights  Agreement,  dated as of September  28,
2004 (as  amended  to date,  the  "Rights  Agreement").  Pursuant  to the Rights
Agreement,  each share of the Company's common stock, par value $.001 per share,
includes  one  preferred  share  purchase  right  (a  "Right")   representing  a
contingent right to purchase, under certain circumstances, one one-thousandth of
a share of the Company's Series A Participating Preferred Stock, par value $.001
per share. Pursuant to the Amendment, the "Final Expiration Date," as defined in
the Rights  Agreement,  has been changed from June 5, 2007 (the date that is ten
years after the original Rights dividend  declaration date), to May 1, 2005. The
change  will have the effect of causing the Rights  Agreement  and the Rights to
terminate  at the close of business  on May 1, 2005,  unless a change of control
event under the Rights Agreement occurs prior thereto. Amendment No. 2 to Rights
Agreement is filed herewith as Exhibit 4.1.


SECTION 3 -- SECURITIES AND TRADING MARKETS

ITEM 3.03 MATERIAL MODIFICATION TO RIGHTS OF SECURITY HOLDERS

     The information set forth under Item 1.01 "Entry into a Material Definitive
Agreement" of this From 8-K is incorporated herein by reference.


SECTION 9 -- FINANCIAL STATEMENTS AND EXHIBITS

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS

(a)  Financial Statements of Businesses Acquired.

     Not  Applicable

(b)  Pro Forma Financial Information.

     Not  Applicable

(c)  Exhibits.

     4.1. Amendment  No. 2 to  Rights  Agreement,  dated as of March  18,  2005,
          between  Calpine  Corporation  and EquiServe  Trust Company,  N.A., as
          Rights Agent






                                   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: March 22, 2005







                                    EXHIBITS


4.1. Amendment No. 2 to Rights  Agreement,  dated as of March 18, 2005,  between
     Calpine Corporation and EquiServe Trust Company, N.A., as Rights Agent