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 12, 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 5.02  --  DEPARTURE  OF  DIRECTORS  OR  PRINCIPAL  OFFICERS;   ELECTION  OF
               DIRECTORS; APPOINTMENT OF PRINCIPAL OFFICERS.

     (b),  (c)  On  December  12,  2005,  the  Board  of  Directors  of  Calpine
Corporation  (the  "Company")  named  Robert P. May as its new  Chief  Executive
Officer and  unanimously  elected Mr. May as a member of the Company's  Board of
Directors.  Effective with the appointment of Mr. May,  Kenneth T. Derr, who had
been acting Chief Executive Officer since November 28, 2005, has stepped down as
Chief  Executive  Officer.  Mr.  Derr will  continue to serve as Chairman of the
Company's Board of Directors.

     Over the past 30 years, Mr. May has served in various senior management and
executive  positions,  most recently as  non-executive  chairman of the board of
HealthSouth  Corporation from July 2004 to October 2005. Mr. May, who had joined
HealthSouth  Corporation's  board  in  2002,  also  served  as  interim  CEO  of
HealthSouth  Corporation from March 2003 to May 2004 and as interim president of
its  outpatient  and  diagnostic  division  from August 2003 to January 2004. In
addition,  from January  2005 to August  2005,  Mr. May served as interim CEO of
Charter  Communications  Inc.,  where  he has  been a  member  of the  board  of
directors since October 2004. Mr. May served as chief executive officer and as a
member of the board of directors of PNV, Inc. from March 1999 to March 2001. Mr.
May was  chief  operating  officer  and a member of the  board of  directors  of
Cablevision  Systems Corp. from 1996 to 1998.  Since 2001, Mr. May has served as
principal of RPM Systems,  a strategic and private  investing  consulting  firm.
Currently,  Mr. May  continues to serve as a member of the board of directors of
Charter  Communications  and also  serves as a member of the  advisory  board of
Deutsche Bank Americas.

     The Company expects to enter into an employment  agreement with Mr. May in
the near  future,  and will  provide the  information  required by Form 8-K with
respect to such agreement when it is entered into.

     On December 12, 2005,  the Company  issued a press  release  regarding  the
foregoing. A copy of the press release is attached hereto as Exhibit 99.1.


ITEM 9.01 -- FINANCIAL STATEMENTS AND EXHIBITS.

     (d) Exhibits.

          99.1 Press Release dated December 12, 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: December 16, 2005





                                  EXHIBIT INDEX




               Exhibit                Description
               -------   -------------------------------------
               99.1      Press release dated December 12, 2005

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

EXHIBIT 99.1

                                                                    NEWS RELEASE



Media Relations: Katherine Potter               Investor Relations: Rick Barraza
                 408-792-1168                                       408-792-1125
                 kpotter@calpine.com                           rickb@calpine.com

                                                                    Karen Bunton
                                                                    408-792-1121
                                                             kbunton@calpine.com


           Calpine Names Robert P. May as New Chief Executive Officer

     (SAN JOSE,  Calif.)  /PR  Newswire - First  Call/ Dec.  12,  2005 - Calpine
Corporation [OTC Pink  Sheets:CPNL]  announced today that its Board of Directors
has named Robert P. May as Calpine's new Chief  Executive  Officer and member of
the Board. Mr. May succeeds Acting Chief Executive  Officer Kenneth T. Derr, who
will continue serving as Calpine's Chairman of the Board.

     "Calpine is exceptionally fortunate to have Bob May at the helm, especially
during this important  period of  transition,"  stated Mr. Derr. "We are excited
about what Bob brings to  Calpine.  His  leadership  qualities,  experience  and
knowledge  will help lead  Calpine  through a critical  period in the  company's
history.  And his  proven  ability  to  implement  and  manage  operational  and
financial improvements - as he successfully demonstrated at HealthSouth, Charter
Communications,  FedEx and  Cablevision  - are what we need to help  enhance the
value  of  Calpine,   strengthen   operations  and  address  current   financial
challenges."

     Mr. May said, "I am honored to have the  opportunity  to lead Calpine.  The
Board,  management team, and I have a solid understanding of the challenges that
lay ahead.  We are committed to  successfully  addressing  our  operational  and
financial issues in the best interests of all stakeholders. In short, we need to
reduce  our debt  levels,  improve  our  balance  sheet and  align our  business
strategy and operational  structure with the current economic climate and energy
market conditions."

     Over the past 30 years,  Mr.  May,  age 56, has  served in  various  senior
management and executive  positions.  Most recently,  he served as non-executive
Chairman  of the Board of  HealthSouth  from July 2004 to October  2005,  and as
Interim  President and Chief Executive  Officer of Charter  Communications  from
January 2005 to August 2005.

     At Cablevision  Systems,  Corp., where he was Chief Operating Officer and a
director from 1996 to 1998,  Mr. May was part of the executive  team that helped
transition  the company  through  new  operating  strategies  and the use of new
technologies.  From 1973 to 1993,  Mr. May held  several  senior  executive  and
operational positions at Federal Express Corporation, where he was most recently
President,   Business   Logistics,   and  was  a  Board  member  of  HealthSouth
Corporation,  a national provider of healthcare services, since October 2002. He
also served as  HealthSouth's  Interim Chief  Executive  Officer from March 2003
until May of 2004,  and as Interim  President of its  Outpatient  and Diagnostic
Division from August 2003 to January 2004.  Currently,  he serves as a member of
Charter  Communications'  Board  of  Directors  and  Deutsche  Bank of  Americas
Advisory Board.

     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 and is building a plant
in Mexico.  Its customized  products and services  include  wholesale and retail
electricity,  gas turbine components and services, energy management, and a wide
range of power plant engineering,  construction and maintenance, and operational
services.   Calpine  was   founded  in  1984.   For  more   information,   visit
http://www.calpine.com.

     This  news  release  discusses  certain  matters  that  may  be  considered
"forward-looking" statements within the meaning of Section 27A of the Securities
Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934,
as  amended,  including  statements  regarding  the  intent,  belief or  current
expectations  of  Calpine   Corporation  ("the  Company")  and  its  management.
Prospective investors are cautioned that any such forward-looking statements are
not  guarantees  of  future  performance  and  involve  a number  of  risks  and
uncertainties  that could materially  affect actual results  including the risks
identified  from   time-to-time  in  the  Company's   reports  and  registration
statements  filed with the SEC,  including  the risk factors  identified  in its
Annual  Report on Form 10-K for the year ended  December  31,  2004,  and in its
Quarterly  Report on Form 10-Q for the three  months ended  September  30, 2005,
which  can  also be found  on the  Company's  website  at  www.calpine.com.  All
information  set forth in this  news  release  is as of  today's  date,  and the
Company undertakes no duty to update this information.