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): September 14, 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))



ITEM 1.01 - ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT.

     On September 14, 2005, the Board of Directors of Calpine  Corporation  (the
"Company")  approved an amendment to the Company's 1996 Stock Incentive Plan, as
amended (the "Stock Incentive  Plan").  The amendment  provides that all options
held by a member of the Board of  Directors  who has  completed  at least  three
years of service on the Board of  Directors  will become  fully vested upon such
director's  termination  of service on the Board of  Directors  and will  remain
exercisable for the full term of the option.

     As described in Item 5.02(d) below, on September 19, 2005, Walter L. Revell
and William J. Keese were  elected to the  Company's  Board of  Directors.  Upon
their  election,  Messrs.  Revell and Keese each  received a stock  option grant
under the Stock  Incentive Plan  exercisable  for 50,000 shares of the Company's
common stock. Subject to the amendment described above, each option will vest in
a series  of four  successive  equal  annual  installments  upon the  optionee's
completion of each year of Board service over the four-year period measured from
the option grant date.


ITEM 5.02 - DEPARTURE OF DIRECTORS OR PRINCIPAL OFFICERS; ELECTION OF DIRECTORS;
            APPOINTMENT OF PRINCIPAL OFFICERS.

     (b) On  September  14, 2005,  Jeffrey E. Garten  retired as a member of the
Company's Board of Directors.  On the same day, John O. Wilson, also a member of
the Board of  Directors,  informed  the Board  that he plans to retire  from the
Board of Directors later this year.

     (d)  Effective on September  19, 2005,  the Board of Directors  unanimously
elected two new members:  Walter L. Revell, Chairman and Chief Executive Officer
of Revell Investments International, Inc., and William J. Keese, former Chairman
of the California Energy Commission.  Mr. Revell has been named to the Audit and
Compensation  Committees  of the  Board,  and Mr.  Keese  has been  named to the
Nominating and Governance  Committee of the Board.  There are no arrangements or
understandings between Messrs. Revell or Keese and any other persons pursuant to
which  either  was  selected  as  a  director,   and  there  are  no  reportable
transactions under Item 404(a) of Regulation S-K.

     A copy of the press release announcing the retirement of Messrs. Garten and
Wilson,  and the election of Messrs.  Revell and Keese, is filed as Exhibit 99.1
to this Report.


ITEM 9.01 - FINANCIAL STATEMENTS AND EXHIBITS.

(c) Exhibits.

    99.1 Press Release dated September 20, 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/ Robert D. Kelly
                                       ------------------------------------
                                       Robert D. Kelly
                                       Executive Vice President and
                                       Chief Financial Officer

Date: September 20, 2005



                                  EXHIBIT INDEX




                     Exhibit            Description
                     -------   --------------------------------------
                     99.1      Press release dated September 20, 2005


================================================================================

EXHIBIT 99.1


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


                   William J. Keese and Walter L. Revell Join
                          Calpine's Board of Directors

     (SAN JOSE,  Calif.)  /PR  Newswire - First Call/  September  20, 2005 - The
Calpine Corporation  [NYSE:CPN] Board of Directors has named two new independent
directors:   William  J.  Keese,   former  Chairman  of  the  California  Energy
Commission, and Walter L. Revell, Chairman and Chief Executive Officer of Revell
Investments International, Inc. Keese and Revell are replacing two distinguished
directors,  Jeffrey E. Garten, who retired September 14, and John O. Wilson, who
plans to retire later this year.  Calpine  Director  Gerald  Greenwald  has been
appointed  Chair of Calpine's  Compensation  Committee,  replacing  Garten,  and
Director  Susan  Wang will  serve as Chair of  Calpine's  Audit  Committee  upon
Wilson's retirement.

     "We are honored to have Bill Keese and Walter Revell join  Calpine's  Board
of Directors,"  said Calpine  Chairman,  President and Chief  Executive  Officer
Peter  Cartwright.  "Together  they bring to Calpine  extensive  experience  and
service in the energy,  government  and private  sectors.  Their  commitment  to
excellence and diverse public policy and management  leadership  will strengthen
our Board and further enhance  Calpine's core operating  strengths and corporate
culture."

     Keese  brings to  Calpine  more than 25 years of  experience  in the energy
industry,  most recently serving as Chairman of the California Energy Commission
(CEC).  During  his  eight-year  tenure  with the CEC,  Keese  was  Chair of the
National Association of State Energy Officials and the Western Interstate Energy
Board.  Prior to his distinguished  career at the CEC, he served as a California
public affairs  advocate and consultant,  representing  energy and  professional
clients.  He currently is a California  Representative  to, and Co-Chair of, the
Western  Governors'  Association Clean and Diversified Energy Advisory Committee
and the Board of the Alliance to Save Energy.  Keese earned his Juris  Doctorate
at Loyola  University,  Los Angeles and is a member of the American,  California
and Sacramento Bar Associations.

     Chairman and Chief Executive Officer of Revell  Investments  International,
Inc., an investment,  development and management  company,  Revell has enjoyed a
successful  career in the public and private  sectors.  Prior to founding Revell
Investments in 1984, he was Chairman and Chief  Executive  Officer of H. J. Ross
Associates,  an  engineering  services  company.  He has  served in a variety of
senior management positions in leading engineering,  telecommunications and real
estate firms.  During Revell's years of public service in Florida,  he served as
Secretary  of  Transportation  and as Vice  Chairman  of the  Public  Facilities
Financing Commission.  He chaired the Florida Energy 2020 Study Commission,  and
the Florida and Greater Miami Chambers of Commerce.  Revell earned a Bachelor of
Science degree from Florida State University.

     Calpine  Chairman,  Chief Executive  Officer and President Peter Cartwright
stated,  "Jeff  Garten and John  Wilson  have helped  guide  Calpine  during our
company's  transition from a small, power plant developer,  to a 27,000-megawatt
North American power company, active in every major North American power market.
Their contributions over the past eight years have helped create a collaborative
and independent Board. We wish them every success in their new ventures."

     Garten  and  Wilson  joined  Calpine's  Board in 1997,  shortly  after  the
company's  initial public offering.  Their counsel,  leadership and wide-ranging
contributions  have gone well beyond their highly regarded  careers in academia,
finance and  government  service.  Garten is  retiring to pursue a new  business
venture and to devote more time to his new  teaching  responsibilities  at Yale.
Wilson  plans to devote his time to  academia  and will  continue  to serve as a
faculty member of the University of California at Berkeley.

About Calpine

     A  major  power  company,   Calpine  Corporation   supplies  customers  and
communities  with  electricity  from clean,  efficient,  natural  gas-fired  and
geothermal power plants. Calpine owns, leases and operates integrated systems of
plants  in 21 U.S.  states  and in  three  Canadian  provinces.  Its  customized
products and services include wholesale and retail electricity, natural gas, gas
turbine components and services,  energy  management,  and a wide range of power
plant engineering,  construction and operations services. Calpine was founded in
1984. It is included in the S&P 500 Index and is publicly traded on the New York
Stock   Exchange   under  the   symbol   CPN.   For  more   information,   visit
http://www.calpine.com.