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 1, 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  8.01  -- OTHER EVENTS

     On  December  1, 2005,  the  Company  issued a press  release,  attached as
Exhibit 99.1 hereto.


ITEM 9.01 --  FINANCIAL STATEMENTS AND EXHIBITS

     (d) Exhibits.

          99.1 Press Release dated  December 1, 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 1, 2005









                                  EXHIBIT INDEX




               Exhibit                Description
               -------   -------------------------------------
               99.1      Press release dated December 1, 2005

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


EXHIBIT 99.1

                                                                    NEWS RELEASE

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

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

          Calpine Provides Update Regarding Certain Litigation Matters

     (SAN  JOSE,  Calif.)  /PR  Newswire - First  Call/  Dec.  1, 2005 - Calpine
Corporation [NYSE:CPN] provided updates on the following litigation matters:

Natural Gas Sale Proceeds Litigation

     On November 30, 2005,  Calpine  filed with the  Delaware  Chancery  Court a
memorandum  in response to the court's  November  22, 2005  opinion in Calpine's
suit regarding the  disposition of the proceeds from Calpine's July 2005 sale of
its natural gas assets (Opinion). In the Opinion, the court directed the parties
to make submissions regarding an appropriate  restorative remedy relating to the
$313 million of sale proceeds released to Calpine by the collateral  trustee. In
the memorandum,  Calpine  informed the court that, given the delay of the second
lien  bondholders  in asserting  their rights,  Calpine  believes an appropriate
remedy would be the restoration of $199 million, plus accrued interest at a rate
of 3.5%,  per annum to the  collateral  account  or the use of that  amount  for
reinvestment  in  qualifying  designated  assets or  repurchase of secured debt.
Calpine  also  requested  that the court allow it a period of 90 days to restore
the funds.  Wilmington Trust Company,  in its capacity as trustee for the second
lien  bondholders,  requested  that the court  direct  Calpine to  restore  $313
million in cash, plus interest at the Delaware  statutory  pre-judgment  rate to
the collateral  account,  within the later of (i) one week from the entry of the
court's final judgment, and (ii) December 9, 2005.

     Recent  developments  affecting the company,  including  the Opinion,  have
undermined its ability to complete  planned  financial  transactions to meet its
cash-flow requirements. Regardless of how the Court rules in this case, there is
a  substantial  risk that Calpine will not have  sufficient  cash to satisfy the
restorative remedy ordered by the court and its ongoing debt service obligations
and operating  expenses.  As a  consequence,  Calpine  continues to evaluate its
options, including the possibility of filing for bankruptcy.

Harbert Contingent Convertible Notes Litigation

     In a suit filed in the Supreme Court,  New York County,  State of New York,
Harbert Convertible  Arbitrage Master Fund, Ltd. and related entities (Harbert),
holders of  Calpine's  6%  Contingent  Convertible  Notes due 2014  (Convertible
Notes),  joined by Wilmington Trust Company, the trustee under the Indenture for
the Convertible Notes,  acting on behalf of all holders of the Convertible Notes
(Trustee),  contend that Calpine  breached an obligation  under the  Convertible
Notes  Indenture.  Specifically,  the  plaintiffs  allege that Calpine failed to
engage  the Bid  Solicitation  Agent  to  determine  the  trading  price  of the
Convertible  Notes after Harbert presented to Calpine what the plaintiffs assert
was  reasonable  evidence that the Trading Price (as defined by the  Convertible
Notes  Indenture) of the Notes was below 95% of parity in relation to the market
price of Calpine's common stock.

     At a status  conference  on November 22, 2005,  Calpine  informed the court
that it  continues  to  believe  that  there  had  been  no  default  under  the
Convertible  Notes  Indenture.  However,  in an effort to remove the uncertainty
raised by the claims in the litigation  and by a purported  default notice based
on the same  assertions,  Calpine  has taken  actions,  which it  believes  have
effected  a cure of the  alleged  default.  In this  regard,  at the  request of
Calpine,  American Stock Transfer and Trust Company,  the Bid Solicitation Agent
for the Convertible  Notes,  determined in accordance with the Convertible Notes
Indenture  the Trading  Price of the  Convertible  Notes at all of the  relevant
times cited by Harbert and another holder in their purported  notice of default.
Based on the Trading Prices  determined by the Bid Solicitation  Agent,  Calpine
has calculated that at all relevant times the  relationship of the Trading Price
of the Convertible  Notes to the market price of Calpine's common stock was such
that the  Convertible  Notes did not become  convertible  under the terms of the
Convertible Notes Indenture.

     While  Calpine  believes  that it has at all times been in full  compliance
with  its  obligations  under  the  Convertible  Notes  Indenture,  there  is no
assurance  that  Harbert and the Trustee  will not continue to press their claim
that Calpine has breached the  Convertible  Notes Indenture by failing to engage
on a timely  basis the Bid  Solicitation  Agent,  including by  contending  that
Calpine's cure of the alleged breach was  ineffective.  If it is determined that
Calpine has defaulted in its obligation under the Convertible Notes Indenture as
alleged  by  Harbert  and the  Trustee,  and if such a default  were found to be
material  and not to have been cured,  then all of the  Convertible  Notes would
become  immediately  due and payable at the election of the  holders.  Moreover,
such  acceleration  under the Convertible  Notes  Indenture  would  constitute a
default under other debt obligations of 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 and is building a plant
in Mexico.  Calpine was founded in 1984.  It is publicly  traded on the New York
Stock   Exchange   under  the   symbol   CPN.   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.