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 5, 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)  On December 5, 2005,  Gerald  Greenwald  resigned  from the  Company's
          Board of Directors.


ITEM 8.01 -- OTHER EVENTS

     On December 8, 2005, the Company issued a press release  entitled  "Calpine
Provides  Update on Delaware  Litigation," a copy of which is attached hereto as
Exhibit 99.1.


ITEM 9.01 -- FINANCIAL STATEMENTS AND EXHIBITS

     (d) Exhibits.

          99.1 Press Release dated December 8, 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 8, 2005





                                  EXHIBIT INDEX




               Exhibit                Description
               -------   ------------------------------------
               99.1      Press release dated December 8, 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 Provides Update on Delaware Litigation

     (SAN JOSE,  Calif.) /PR Newswire -- First Call/ December 8, 2005 -- Calpine
Corporation [OTC Pink  Sheets:CPNL]  provided the following update in connection
with Calpine's  action in the Delaware Court of Chancery against The Bank of New
York,  as  collateral  trustee for Calpine's  Senior  Secured Note Holders,  and
Wilmington  Trust Company,  as indenture  trustee for Calpine's  First Lien Note
Holders and Second Lien Note Holders.

     On December 5, 2005,  Vice  Chancellor  Leo E. Strine,  Jr. entered a Final
Order and Judgment in the Chancery Court action affording  Calpine until January
22, 2006 to restore to the Bank of New York collateral  account  $311,782,955.55
plus  interest  from the date any  portion of the funds was  withdrawn  from the
account to the date of  redeposit,  at the rate  accruing in the account  during
such period.

     On December 5 and 6, several parties  appealed the Final Order and Judgment
as follows:  Calpine filed a notice of appeal of the Chancery  Court's  decision
that storage gas is not a Designated Asset under the Indentures, the Second Lien
Trustee filed a notice of appeal of the Chancery  Court's decision insofar as it
granted Calpine until January 22, 2006 to restore monies to the Bank of New York
collateral  account,  and the First Lien Trustee filed a notice of appeal of the
Chancery  Court's  decision  that it lacked  standing  to  object  to  Calpine's
purchases of storage gas. The Supreme Court of the State of Delaware has granted
expedited  review and has scheduled  oral  arguments on the appeals for December
15, 2005.

     Also on  December  5, the  Second  Lien  Trustee  sent a letter to  Calpine
purporting  to constitute a notice of default based on Calpine's use of proceeds
from  the  sale  of  Designated   Assets.   The  letter  further   characterized
counterclaims  filed by the Second Lien  Trustee in the Delaware  litigation  on
November  7, 2005 as an earlier  notice of default,  notwithstanding  the Second
Lien  Trustee's  having implied in a brief filed with the court in late November
that it had not previously declared a "default under the Indentures." The Second
Lien Trustee stated in the letter that if Calpine did not cure its breach within
30 days after the purported  earlier  notice  (namely,  by December 7, 2005) the
Second Lien Trustee, or the holders of the requisite percentage of any series of
Second Lien Notes,  could  respectively  elect to declare all of the Second Lien
Notes, or a series of Notes, to be due and payable immediately.

     Calpine believes that the Second Lien Trustee's  December 5 letter does not
constitute  a valid  notice  of  default  and is  contrary  to the  terms of the
Chancery  Court's  Final Order and Judgment,  as well as statements  made in the
Second Lien Trustee's briefs. On December 6, 2005, Calpine filed a motion in the
Chancery  Court for a temporary  restraining  order seeking to enjoin the Second
Lien Trustee from either accelerating the Second Lien Notes on or before January
22, 2006 or  otherwise  attempting  to  circumvent  the Court's  Final Order and
Judgment. Acceleration of the Second Lien Notes would constitute a default under
other debt obligations of Calpine, which could allow such other debt obligations
to also be accelerated.

     On December 8, 2005,  Calpine agreed to withdraw its motion for a temporary
restraining  order under a stipulation  reached with the Second Lien Trustee and
an Unofficial Steering Committee of Second Lien Debtholders of Calpine.  Calpine
has been advised that the Unofficial  Steering Committee  currently includes the
holders of over 50% of each of the Second  Lien Notes due 2010,  the Second Lien
Notes due 2011,  and the Second Lien Notes due 2013, and the holders of over 30%
of the Second Lien Notes due 2007.

     Under the  stipulation,  the Second  Lien  Trustee  and the  members of the
Unofficial  Steering  Committee have agreed that they will not accelerate any of
the Second Lien Notes on or before  January 22, 2006 based upon the breach found
by the Chancery  Court.  The members of the Unofficial  Steering  Committee have
further  agreed that they will not directly or  indirectly  encourage  any other
Second Lien  Noteholder to accelerate  any of the Second Lien Notes on or before
January 22, 2006 based upon the breach found by the Chancery Court,  and, in the
event of any such  purported  acceleration,  will  use  commercially  reasonable
efforts,  consistent  with the Second Lien  Indentures,  to cause such purported
acceleration  to be rescinded.  The  stipulation is subject to  modification  to
conform to any reversal or  modification  by the Delaware  Supreme  Court of the
Chancery Court's Final Order and Judgment.

     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.  For  more   information,   visit
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.