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): November 29, 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 1.01 -- ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT

     On  December 1, 2005,  the Board of  Directors  of the Company  approved an
amendment (the "12/1/05  Amendment") to the Company's 1996 Stock Incentive Plan,
as amended (the "Stock Incentive Plan").  The 12/1/05 Amendment rescinds in part
the  September  14, 2005  amendment to the Stock  Incentive  Plan (the  "9/14/05
Amendment") in two respects:

     1.   The 12/1/05 Amendment  rescinds the extension of the  post-termination
          exercise period of directors' options granted by the 9/14/05 Amendment
          as  it  applied  to  options  held  by  outside  directors  that  were
          outstanding  on September 14, 2005. The  provisions  establishing  the
          exercise  period  of  the  options   outstanding  on  such  date  were
          reinstated  to  those  that  were  in  effect  prior  to  the  9/14/05
          Amendment.  The  provisions  of the 9/14/05  Amendment  extending  the
          post-termination  exercise  period  of  directors'  options  otherwise
          remains in effect and shall apply to any options granted to an outside
          director after September 14, 2005.

     2.   The 12/1/05  Amendment  provides  that the  provisions  of the 9/14/05
          Amendment  accelerating the vesting of directors' options shall remain
          in effect and shall apply to all options  held by an outside  director
          regardless of when such options were  granted,  except for any options
          issued under the Director  Fee Option  Grant  Program  under the Stock
          Incentive  Plan.  Such  acceleration  was  rescinded  by  the  12/1/05
          Amendment  as to any options  granted  under the  Director  Fee Option
          Grant Program  (whether  outstanding  on September 14, 2005 or granted
          thereafter).

ITEM 3.01 -- NOTICE OF DELISTING OR FAILURE TO SATISFY A CONTINUED  LISTING RULE
             OR STANDARD; TRANSFER OF LISTING.

     On December 2, 2005,  the staff of the New York Stock Exchange (the "NYSE")
orally  advised the Company that it intends to suspend  trading in the Company's
common stock prior to the opening of the market on Tuesday, December 6, 2005, or
earlier if it deems  necessary.  On  December  5, 2005,  the NYSE issued a press
release  stating  that an  application  by the  NYSE to the  SEC to  delist  the
Company's  common  stock is pending the  completion  of  applicable  procedures,
including  any appeal by the Company of the NYSE staff's  decision.  The Company
believes that the NYSE application to delist the Company's common stock would be
pursuant  to Section  801.01D  of the NYSE's  Listed  Company  Manual.  The NYSE
attributed  its decision to the  abnormally  low selling  price of the Company's
common stock and the Company's current financial condition.  The Company expects
its common stock will be quoted on the OTC Bulletin Board.

     The Company has not yet  determined  what  action,  if any, it will take in
response to the notification.

     On December 5, 2005,  the Company  issued a press  release  regarding  this
event. A copy of the press release is attached as Exhibit 99.1 hereto.


ITEM 8.01 -- OTHER EVENTS

     On November 29, 2005,  pursuant to the terms of the Company's 2000 Employee
Stock  Purchase  Plan (the  "ESPP"),  the Company  determined to (a) suspend the
ESPP, effective November 29, 2005; (b) cancel the purchase interval scheduled to
end on November 30, 2005,  terminate all  outstanding  purchase  rights for such
interval  and refund to  employees  any  payments  made  pursuant to the ESPP in
respect of such interval;  and (c) postpone the new offering  scheduled to begin
on December 1, 2005,  until further  action by the Company's  Board of Directors
and to refund any contributions collected in anticipation of the commencement of
the new offering.

     In addition,  On December 1, 2005, the Company  determined that the Calpine
Unitized  Stock Fund  investment  election  (the "Stock Fund") under the Calpine
Corporation  Retirement  Savings  Plan (the "401k  Plan") shall be closed to new
investment with respect to future  contributions  effective after  settlement on
December 2, 2005. 401k Plan participants and  beneficiaries  will continue to be
allowed  to make  transfers  out of the Stock  Fund and into  other  investments
offered under the 401k Plan.

     On December 1, 2005, the Company issued a press release  entitled  "Calpine
Announces  Offer to Purchase 9 5/8% First Priority Senior Secured Notes due 2014
for Up to $400,000,000 Million in Aggregate Cash Consideration," a copy of which
is attached as Exhibit 99.2 hereto.

     On December 2, 2005, the Company issued a press release  entitled  "Calpine
Provides Update on Delaware  Litigation," a copy of which is attached as Exhibit
99.3 hereto.


ITEM 9.01 -- FINANCIAL STATEMENTS AND EXHIBITS

     (d) Exhibits.

          99.1 Press Release dated December 5, 2005.
          99.2 Press Release dated December 1, 2005.
          99.3 Press Release dated December 2, 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 5, 2005







                                  EXHIBIT INDEX




               Exhibit                Description
               -------   ------------------------------------
               99.1      Press release dated December 5, 2005
               99.2      Press release dated December 1, 2005
               99.3      Press release dated December 2, 2005

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

EXHIBIT 99.1


                                                                    NEWS RELEASE



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

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

       Calpine's Common Stock to Cease Trading on New York Stock Exchange


     (SAN  JOSE,  Calif.)  /PR  Newswire - First  Call/  Dec.  5, 2005 - Calpine
Corporation  [NYSE:CPN] was notified by the New York Stock Exchange  (NYSE) that
the  company's  common  stock  will no longer  be  traded on the NYSE.  The NYSE
advised  the  company  that it expects  to  suspend  trading in CPN prior to the
opening  of the market on  Tuesday,  December  6,  2005,  or earlier if it deems
necessary. The NYSE attributed its decision to suspend trading to the abnormally
low selling price of Calpine's common stock and the company's  current financial
condition.  Calpine  expects its common stock will be quoted on the OTC Bulletin
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. 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  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.


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

EXHIBIT 99.2


                                                                    NEWS RELEASE

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

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

            Calpine Announces Offer to Purchase 9 5/8% First Priority
              Senior Secured Notes due 2014 for Up to $400,000,000
                         in Aggregate Cash Consideration


     (SAN  JOSE,  Calif.)  /PR  Newswire - First  Call/  Dec.  1, 2005 - Calpine
Corporation  [NYSE:CPN]  announced today the commencement of a tender offer (the
"Offer") to purchase for aggregate cash consideration not to exceed $400,000,000
(the  "Maximum  Tender  Amount")  such portion of the  outstanding  9 5/8% First
Priority  Senior  Secured Notes due 2014 (the "Notes") as are validly issued and
not withdrawn up to the Maximum Tender Amount. The aggregate principal amount of
the outstanding Notes is currently $646,105,000.

     Subject to the terms and conditions of the Offer, the consideration for the
Notes validly tendered pursuant to the Offer on or prior to 12:00 midnight,  New
York  City  time,  on  the  Expiration  Date  (as  defined  below)  (the  "Offer
Consideration")  shall be $1,000 per $1,000 principal amount of the Notes,  plus
accrued and unpaid  interest up to, and including,  the settlement  date for the
tender offer, which will be promptly following the Expiration Date.

     The Offer is scheduled to expire at 12:00 midnight,  New York City Time, on
December  29,  2005,  unless  extended or earlier  terminated  (the  "Expiration
Date"). Tendered Notes may be withdrawn at any time prior to 12:00 midnight, New
York City Time, on the Expiration Date.

     The  Company is making  this Offer to avail  itself of the  opportunity  to
reduce its first lien  indebtedness by applying the proceeds of the sale in July
2005 of certain U.S. natural gas assets to the purchase of the Notes.

     Notwithstanding any other provision of the Offer,  Calpine's  obligation to
accept for  purchase,  and to pay for,  Notes validly  tendered  pursuant to the
Offer is conditioned  upon  satisfaction or waiver of certain  conditions as set
forth in the Offer to Purchase.  Calpine, in its sole discretion,  may waive any
of the  conditions  of the tender offer in whole or in part, at any time or from
time to time. Calpine reserves the right in its sole discretion to extend, amend
or terminate the Offer, subject to applicable law.

     This press  release is not an offer to  purchase  or a  solicitation  of an
offer to sell any securities,  which is being made only pursuant to the Offer to
Purchase,  dated December 1, 2005.  Calpine has retained The Bank of New York to
serve as the Tender Agent and MacKenzie  Partners,  Inc. to serve as Information
Agent for the Tender Offer. Additional  information,  and copies of the Offer to
Purchase,  the Letter of Transmittal and other  documents,  may be obtained from
MacKenzie Partners,  Inc. at (800) 322-2885 or by calling (212) 929-5500 collect
or in writing at 105 Madison Avenue, New York, New York 10016.

     None of  Calpine,  the  Tender  Agent or the  Information  Agent  makes any
recommendation  as to whether or not holders of Notes should  tender their Notes
pursuant  to the Offer.  Holders  must make their own  decision as to whether to
tender their Notes,  and if tendering,  the principal amount of Notes to tender.
In any  jurisdiction  where the laws  require the Offer to be made by a licensed
broker or dealer,  the Offer will be deemed  made on behalf of Calpine by one or
more registered brokers or dealers under the laws of such jurisdiction.

     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,  three Canadian  provinces and in the United Kingdom.
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 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.  Such risks include,
but  are not  limited  to,  those  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 quarter ended
September  30,  2005,   which  can  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.


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

EXHIBIT 99.3

                                                                    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/  Dec.  2, 2005 - Calpine
Corporation  [NYSE:CPN]  provided the following update to today's Delaware Court
of Chancery's  ruling in the company's  action  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.  In his ruling today,  Vice  Chancellor Leo E. Strine,
Jr.  ordered  Calpine  to  restore  to the Bank of New York  collateral  account
approximately  $313 million,  plus accrued interest at 3.5% per annum by January
22, 2006.

     Upon receipt of the final order, Calpine expects to file a notice of appeal
with the Supreme Court of Delaware and request expedited treatment.

     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. It is publicly traded on the New York Stock Exchange under the symbol
CPN. For more information, visit http://www.calpine.com.