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): July 7, 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 No. 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 July 7, 2005, we, along with our subsidiaries,  Calpine Gas Holdings LLC
and Calpine Fuels  Corporation  (collectively,  the  "Sellers"),  entered into a
Purchase and Sale Agreement with Rosetta Resources Inc. ("Rosetta"),  the buyer,
pursuant to which we sold all of our remaining  domestic oil and gas exploration
and production  properties and assets (the "Domestic Oil and Gas  Properties" or
"oil and gas") for  approximately  $1.05 billion,  subject to adjustments,  less
transaction fees and expenses of approximately $61.6 million, and subject to the
reduction described below. In addition, we expect to incur $3.9 million of costs
related to leased  facility  space,  which  includes  a non-cash  charge of $2.7
million for the write-off of leasehold  improvements.  This also includes future
cash charges  related to the present value of $1.2 million in excess lease costs
over  expected  sublease  income.  A copy of the Purchase and Sale  Agreement is
filed herewith  under Item 9.01(c) as Exhibit 10.1.  Prior to the closing of the
sale on July 7, 2005,  Rosetta was a wholly owned subsidiary of ours.  Following
the  consummation  of the sale,  we no longer  have any  ownership  interest  in
Rosetta. To fund the closing, Rosetta sold $725.0 million of its common stock to
qualified  institutional  buyers and  foreign  investors  in a private  offering
pursuant to Rule 144A and Regulation S under the Securities Act.

     The cash purchase  price of the Domestic Oil and Gas Properties was reduced
by  approximately  $75  million  to  reflect  the value of  certain  oil and gas
properties  for which we were unable to obtain  consents to assignment  prior to
closing (the  "Non-Consent  Properties).  We will  cooperate with Rosetta to use
commercially  reasonable  efforts  to  obtain  consents  to  assignment  of  the
Non-Consent  Properties  and will  transfer to Rosetta,  and Rosetta will pay us
for,  any of the  Non-Consent  Properties  for which such  consents are obtained
during the six-month period  following  closing of the sale. Until such consents
are obtained and the Non-Consent  Properties are transferred to Rosetta, we will
retain title to the Non-Consent Properties, and Rosetta will manage, operate and
market production from the Non-Consent  Properties.  While we expect that all or
substantially all of such Non-Consent Properties will be transferred to Rosetta,
in the event that we do not obtain such consents during the six-month  period as
to  any  Non-Consent  Properties,  those  Non-Consent  Properties  will  not  be
transferred and Rosetta will manage, operate and market production from them for
us for a two year period.

     We sold the Domestic Oil and Gas Properties  subject to certain  warranties
and  representations  that  are  customary  in  transactions  of this  type.  In
addition,  we and the Sellers have agreed to  indemnify  Rosetta for any loss it
may  suffer as a result of (i) all taxes  related  to the  Domestic  Oil and Gas
Properties  for  periods  prior to the  closing  date,  (ii) our  failure to pay
certain  liabilities  retained under the Purchase and Sale Agreement,  (iii) our
continuing  business operations that are not related to the Domestic Oil and Gas
Properties,  and (iv) any  breach  of  certain  representations  and  warranties
contained  in the  Purchase  and Sale  Agreement.  We will record an  additional
liability of 1% of the gross sales proceeds as an allowance for  indemnification
and exit liabilities.


ITEM 2.01     COMPLETION OF ACQUISITION OR DISPOSITION OF ASSETS

     As disclosed in Item 1.01 of this 8-K, on July 7, 2005,  we and the Sellers
entered into and closed a Purchase and Sale Agreement  with Rosetta,  the buyer,
pursuant to which we sold our Domestic Oil and Gas  Properties.  Please see Item
1.01 for a description of the sale and certain post-closing obligations.


ITEM 2.05     COSTS ASSOCIATED WITH EXIT OR DISPOSAL ACTIVITIES

     This  disclosure  updates  and amends the  estimates  that were  previously
provided in the Form 8-K dated June 28, 2005 and filed on July 5, 2005.

     On June  28,  2005,  we  agreed  to sell  all of our  domestic  oil and gas
exploration and production  assets for $1.05 billion,  less transaction fees and
expenses.  We  incorporate  by reference in this Item 2.05 our disclosure in the
press release filed as Exhibit 99.1 to the above  referenced  8-K. In connection
with the sale we  estimate  that we will incur  approximately  $65.5  million in
costs.  This  includes  various  transaction  fees and expenses of $61.6 million
including  investment  banking,  lending,  legal,  tax consulting and accounting
costs.  All of these  transaction  fees and expenses  will be paid in cash.  The
transaction  fees will be paid from the proceeds of the sale.  In  addition,  we
expect to incur $3.9 million of costs related to leased  facility  space,  which
includes  a non-cash  charge of $2.7  million  for the  write-off  of  leasehold
improvements.  This also  includes  future cash  charges  related to the present
value of $1.2 million in excess lease costs over expected  sublease  income.  We
will record an  additional  liability  of 1% of the gross  sales  proceeds as an
allowance for indemnification and exit liabilities.


ITEM 8.01     OTHER EVENTS

     On July 7, 2005, the Registrant issued the press release attached hereto as
Exhibit 99.1


ITEM 9.01     FINANCIAL STATEMENTS AND EXHIBITS

(a) Financial Statements of Businesses Acquired.

      Not Applicable

(b) Pro Forma Financial Information.

     As disclosed in Item 1.01 of this 8-K, on July 7, 2005,  we and the Sellers
entered into and closed a Purchase and Sale Agreement  with Rosetta,  the buyer,
pursuant to which we sold our Domestic Oil and Gas  Properties.  Please see Item
1.01 for a  description  of the sale and certain  post-closing  obligations.  In
addition, on or around July 26, 2005, we expect to close the pending disposition
of Saltend  Cogeneration  Company  Limited  ("SCCL")  and Calpine UK  Operations
Limited ("UK OpCo" or  "Saltend").  The pro forma  financial  information  below
gives effect to the sale of our Domestic Oil and Gas  Properties and the pending
disposition of SCCL and UK OpCo,  both of which we expect to be accounted for as
discontinued  operations in accordance with Financial Accounting Standards Board
("FASB")  Statement  of  Financial   Accounting   Standards  ("SFAS")  No.  144,
"Accounting  for the  Impairment  or Disposal of Long-Lived  Assets"  ("SFAS No.
144").

     The unaudited Pro Forma Consolidated Condensed Statements of Operations are
presented for the three months ended March 31, 2005 and the years ended December
31,  2004,  2003 and 2002 and  present  the  Registrant's  operations  as if the
transactions  described  above had occurred at January 1, 2002. An unaudited Pro
Forma  Consolidated  Condensed  Balance  Sheet as of  March  31,  2005,  is also
presented. The unaudited Pro Forma Consolidated Condensed Balance Sheet presents
the property sales described above, as if they had occurred at March 31, 2005.

     The unaudited Pro Forma Consolidated  Condensed Financial Statements should
be read in conjunction  with the Registrant's  Financial  Statements and related
Notes  included in the  Registrant's  Report on Form 10-Q for the quarter  ended
March 31, 2005 and the Report on Form 10-K for the year ended  December 31, 2004
filed with the Securities and Exchange Commission.


                      Calpine Corporation and Subsidiaries
           Unaudited Pro Forma Consolidated Condensed Balance Sheet
                                 March 31, 2005
           (In thousands, except for per share amounts and unaudited)

                                                                                             Pro Forma
                                                                                               After
                                                                              Oil and Gas   Oil and Gas     Saltend        Final
                                                                   Actual     Adjustments   Adjustments   Adjustments    Pro Forma
                                                                                  (1)                         (2)
                                                                -----------   -----------   -----------   -----------   -----------
                                                                                                         
Assets:
Current assets
  Cash and cash equivalents..................................   $   812,612   $   757,155   $ 1,569,767   $   (38,542)  $ 1,531,225
  Accounts receivable, net...................................     1,034,141            --     1,034,141       (51,295)      982,846
  Margin deposits and other prepaid expense..................       461,097            --       461,097       (19,762)      441,335
  Inventories................................................       148,770            --       148,770        (5,374)      143,396
  Restricted cash............................................       513,753            --       513,753            --       513,753
  Current derivative assets..................................       472,643            --       472,643            --       472,643
  Current assets held for sale...............................            --            --            --       114,973       114,973
  Other current assets.......................................       169,068        74,073       243,141            --       243,141
                                                                -----------   -----------   -----------  ------------   -----------
Total current assets.........................................   $ 3,612,084   $   831,228     4,443,312   $        --   $ 4,443,312
                                                                -----------   -----------   -----------   -----------   -----------
  Restricted cash, net of current portion....................       194,476            --       194,476            --       194,476
  Notes receivable, net of current portion...................       200,443            --       200,443            --       200,443
  Project development costs..................................       152,407            --       152,407            --       152,407
  Unconsolidated investments.................................       387,639            --       387,639            --       387,639
  Deferred financing costs...................................       423,122        (3,362)      419,760            --       419,760
  Prepaid lease, net of current portion......................       431,600            --       431,600       (12,930)      418,670
  Property, plant and equipment, net.........................    20,712,038      (611,458)   20,100,580    (1,056,269)   19,044,311
  Goodwill...................................................        45,160            --        45,160            --        45,160
  Other intangible assets, net...............................        72,009            --        72,009        (4,544)       67,465
  Long-term derivative assets................................       658,440            --       658,440            --       658,440
  Long-term assets held for sale.............................            --            --            --     1,077,263     1,077,263
  Other assets...............................................       690,049            --       690,049        (3,520)      686,529
                                                                -----------   -----------   -----------   -----------   -----------
Total assets.................................................   $27,579,467   $   216,408    27,795,875   $        --   $27,795,875
                                                                ===========   ===========   ===========   ===========   ===========
Liabilities and stockholders' equity:
Current liabilities
  Accounts payable...........................................       945,578            --       945,578       (42,127)      903,451
  Accrued payroll and related expense........................        65,555            --        65,555          (291)       65,264
  Accrued interest payable...................................       396,175        (6,764)      389,411            --       389,411
  Income taxes payable.......................................        79,163            --        79,163            --        79,163
  Notes payable and borrowings under lines of credit,
   current  portion..........................................       209,652            --       209,652            --       209,652
  Preferred interests, current portion(3)....................       268,794            --       268,794            --       268,794
  Capital lease obligation, current portion..................         5,780            --         5,780            --         5,780
  CCFC I financing, current portion..........................         3,208            --         3,208            --         3,208
  Construction/project financing, current portion............       100,773            --       100,773            --       100,773
  Senior notes and term loans, current portion...............       922,489            --       922,489            --       922,489
  Current derivative liabilities.............................       626,125            --       626,125       (43,291)      582,834
  Current liabilities held for sale..........................            --            --            --        93,169        93,169
  Other current liabilities..................................       287,940        10,963       298,903        (7,460)      291,443
                                                                -----------   -----------   -----------   -----------   -----------
Total current liabilities....................................   $ 3,911,232   $     4,199   $ 3,915,431   $        --   $ 3,915,431
                                                                -----------   -----------   -----------   -----------   -----------
  Notes payable and borrowings under lines of credit,
   net of current portion....................................       682,429            --       682,429            --       682,429
  Convertible debentures payable to Calpine Capital
   Trust III.................................................       517,500            --       517,500            --       517,500
  Preferred interests, net of current portion(4).............       493,396            --       493,396            --       493,396
  Capital lease obligation, net of current portion...........       281,756            --       281,756            --       281,756
  CCFC I financing, net of current portion...................       782,020            --       782,020            --       782,020
  CalGen/CCFC II financing...................................     2,395,795            --     2,395,795            --     2,395,795
  Construction/project financing, net of current portion.....     2,003,443            --     2,003,443            --     2,003,443
  Convertible Senior Notes Due 2006..........................         1,311            --         1,311            --         1,311
  Convertible Notes Due 2014.................................       623,429            --       623,429            --       623,429
  Convertible Senior Notes Due 2023..........................       633,775            --       633,775            --       633,775
  Senior notes and term loans, net of current portion........     8,218,408      (138,895)    8,079,513            --     8,079,513
  Deferred income taxes, net of current portion..............       925,365       138,388     1,063,753       (51,725)    1,012,028
  Deferred revenue...........................................       116,041            --       116,041            --       116,041
  Long-term derivative liabilities...........................       903,824            --       903,824       (13,006)      890,818
  Long-term liabilities held for sale........................            --            --            --        82,611        82,611
  Other liabilities..........................................       351,389        (8,278)      343,111       (17,880)      325,231
                                                                -----------   -----------   -----------   -----------   -----------
Total liabilities............................................   $22,841,113   $    (4,586)  $22,836,527   $        --   $22,836,527
                                                                -----------   -----------   -----------   -----------   -----------
  Minority Interests.........................................       388,499            --       388,499            --       388,499
                                                                -----------   -----------   -----------   -----------   -----------
Stockholders' equity
  Preferred stock, $.001 par value per share; authorized
   10,000,000 shares; none issued and outstanding in 2005....            --            --            --            --            --
  Common stock, $.001 par value per share; authorized
   2,000,000,000 shares; issued and outstanding 538,017,458
   shares in 2005............................................           538            --           538            --           538
  Additional paid-in capital.................................     3,159,385            --     3,159,385            --     3,159,385
  Additional paid-in capital, loaned shares..................       258,100            --       258,100            --       258,100
  Additional paid-in capital, returnable shares..............      (258,100)           --      (258,100)           --      (258,100)
  Retained earnings..........................................     1,157,317       220,994     1,378,311            --     1,378,311
  Accumulated other comprehensive income.....................        32,615            --        32,615            --        32,615
                                                                -----------   -----------   -----------   -----------   -----------
Total stockholders' equity...................................   $ 4,349,855   $   220,994   $ 4,570,849   $        --   $ 4,570,849
                                                                -----------   -----------   -----------   -----------   -----------
Total liabilities and stockholders' equity...................   $27,579,467   $   216,408   $27,795,875   $        --   $27,795,875
                                                                ===========   ===========   ===========   ===========   ===========
- ------------
<FN>
(1)  The Pro Forma Consolidated Condensed Balance Sheet reflects the disposition
     of our Domestic Oil and Gas Properties at March 31, 2005. Proceeds from the
     sale are expected to be $1.05 billion before approximately $11.6 million of
     additional  holdbacks and  adjustments  for operations from the transaction
     date in  accordance  with the terms of the Purchase and Sale  Agreement and
     also before  approximately $61.6 million of estimated  transaction fees and
     expenses.   See  Item  2.05  above  for  a   discussion   of  other  costs.
     Additionally,  as indicated in Item 1.01  approximately  $75 million of the
     purchase price was withheld for  non-consent  properties,  and the withheld
     amount is included in other current  assets  adjustments.  Further,  $145.7
     million of the cash  proceeds  are assumed to be used to  purchase,  $138.9
     million of  principal  amount  (and pay $6.8  million  of accrued  interest
     expense) of the  outstanding  First Priority Senior Secured Notes due 2014.
     The  anticipated  gain  of  $221.0  million,  after  consideration  of  the
     foregoing items, contingencies,  excess office space write-off and taxes is
     shown as an adjustment to retained earnings.

(2)  The Pro Forma  Consolidated  Condensed  Balance Sheet  reflects the pending
     disposition of SCCL and UK OpCo at March 31, 2005. The balances of SCCL and
     UK OpCo as of March 31, 2005 have been  reclassified  as "held for sale" on
     the Pro Forma Consolidated Condensed Balance Sheet. Gross proceeds from the
     sale are expected to be (Pound)490  million plus an adjustment  for working
     capital  which was  estimated to be US$19  million as of May 28, 2005,  the
     date the Share Sale and Purchase  Agreement was entered into.  Actual sales
     proceeds in U.S.  dollars may fluctuate due to exchange rate  variances and
     changes  in  working  capital  prior  to the  close of the  sale,  which is
     expected to occur on or around July 26, 2005. Various  transaction fees are
     estimated to be approximately $9 million.  Sales proceeds are not reflected
     in the Pro Forma Consolidated Condensed Balance Sheet.

(3)  Includes $260 million of Redeemable Preferred Shares due July 30, 2005. The
     offerings of the $260 million Redeemable Preferred Shares due July 30, 2005
     and the two-year, $360 million Redeemable Preferred Shares will be redeemed
     using  the  proceeds  of the sale of SCCL and UK OpCo,  which is  currently
     anticipated  to close on July 26, 2005.  Remaining  proceeds  from the sale
     will be used as permitted by our existing bond indentures.

(4)  Includes  $360  million  of  two-year  Redeemable   Preferred  Shares.  The
     offerings of the two-year, $360 million Redeemable Preferred Shares and the
     $260 million Redeemable Preferred Shares due July 30, 2005 will be redeemed
     using the proceeds of the sale of SCCL and UK OpCo as described in Note 3.
</FN>






                      Calpine Corporation and Subsidiaries
      Unaudited Pro Forma Consolidated Condensed Statement of Operations
                    For the Three Months Ended March 31, 2005
                  (In thousands, except for per share amounts)

                                                                                             Pro Forma
                                                                                               After
                                                                              Oil and Gas   Oil and Gas     Saltend        Final
                                                                   Actual     Adjustments   Adjustments   Adjustments    Pro Forma
                                                                                 (1)(6)                      (2)(6)
                                                                -----------   -----------   -----------   -----------   -----------
                                                                                                         
Revenue:
Electric generation and marketing revenue
  Electricity and steam revenue .............................   $ 1,403,549   $        --   $ 1,403,549   $  (125,270)  $ 1,278,279
  Transmission sales revenue ................................         3,744            --         3,744            --         3,744
  Sales of purchased power for hedging and optimization .....       356,130            --       356,130        (8,720)      347,410
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing revenue ..........     1,763,423            --     1,763,423      (133,990)    1,629,433
Oil and gas production and marketing revenue
  Oil and gas sales .........................................        10,820      (10,759)            61            --            61
  Sales of purchased gas for hedging and optimization .......       420,296            --       420,296            --       420,296
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas production and marketing revenue .......       431,116      (10,759)       420,357            --       420,357
Mark-to-market activities, net ..............................        (3,531)           --       (3,531)            --        (3,531)
Other revenue ...............................................        21,670            --        21,670          (484)       21,186
                                                                -----------   -----------   -----------   -----------   -----------
Total revenue ...............................................     2,212,678       (10,759)    2,201,919      (134,474)    2,067,445
                                                                -----------   -----------   -----------   -----------   -----------
Cost of revenue:
Electric generation and marketing expense
  Plant operating expense ...................................       195,626            --       195,626       (13,377)      182,249
  Transmission purchase expense .............................        23,510            --        23,510        (2,636)       20,874
  Royalty expense ...........................................        10,329            --        10,329            --        10,329
  Purchased power expenses for hedging and optimization .....       288,787            --       288,787        (7,592)      281,195
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing expense ..........       518,252            --       518,252       (23,605)      494,647
Oil and gas operating and marketing expense
  Oil and gas operating expense .............................        13,000       (11,199)        1,801            --         1,801
  Purchased gas expense for hedging and optimization ........       413,259            --       413,259            --       413,259
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas operating and marketing expense ........       426,259       (11,199)      415,060            --       415,060
Fuel expense ................................................       921,349        39,776       961,125       (66,817)      894,308
Depreciation, depletion and amortization expense ............       143,228       (15,124)      128,104        (7,398)      120,706
Operating lease expense .....................................        24,777            --        24,777            --        24,777
Other cost of revenue .......................................        38,171            --        38,171            --        38,171
                                                                -----------   -----------   -----------   -----------   -----------
Total cost of revenue .......................................     2,072,036        13,453     2,085,489       (97,820)    1,987,669
                                                                -----------   -----------   -----------   -----------   -----------
Gross Profit ................................................       140,642       (24,212)      116,430       (36,654)       79,776
(Income) loss from unconsolidated investments ...............        (6,064)           72        (5,992)           --        (5,992)
Equipment cancellation and impairment cost ..................           (73)           --           (73)           --           (73)
Project development expense .................................         8,720            --         8,720            --         8,720
Research and development expense ............................         7,034            --         7,034            --         7,034
Sales, general and administrative expense ...................        57,137        (3,351)       53,786          (723)       53,063
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) from operations ...............................        73,888       (20,933)       52,955       (35,931)       17,024
Interest expense ............................................       348,937        (4,631)      344,306       (14,602)      329,704
Interest (income) ...........................................       (14,331)            5       (14,326)          340       (13,986)
Minority interest expense ...................................        10,614            --        10,614            --        10,614
(Income) from repurchase of various issuances of debt .......       (21,772)           --       (21,772)           --       (21,772)
Other expense (income), net .................................         3,980           184         4,164        (9,122)       (4,958)
                                                                -----------   -----------   -----------   -----------   -----------
Income (Loss) before provision or benefit for income taxes...      (253,540)      (16,491)     (270,031)      (12,547)     (282,578)
Provision (Benefit) for income taxes(3)(4)...................       (84,809)       (6,260)      (91,069)       (3,764)      (94,833)
                                                                -----------   -----------   -----------   -----------   -----------
Income (Loss) from continuing operations(5) .................   $  (168,731)  $   (10,231)   $ (178,962)  $    (8,783)  $  (187,745)
                                                                ===========   ===========   ===========   ===========   ===========
Basic and diluted loss per common share:
  Weighted average shares of common stock outstanding .......       447,599                                                 447,599
  Loss from continuing operations(5) ........................         (0.38)                                                  (0.42)

- ------------
<FN>
(1)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     our  Domestic  Oil and Gas  Properties  were sold by  Calpine on January 1,
     2002.  The  results of these  assets have been  removed  from the Pro Forma
     Consolidated  Condensed  Statement of Operations.  The gain associated with
     the sales  transaction  is not included  within the Pro Forma  Consolidated
     Condensed Statement of Operations. See Note 1 to the Pro Forma Consolidated
     Condensed Balance Sheet for a further description of the accounting for the
     transaction.

(2)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     SCCL and UK OpCo were sold by Calpine on  January 1, 2002.  The  results of
     SCCL  and UK  OpCo  have  been  removed  from  the Pro  Forma  Consolidated
     Condensed  Statement of Operations.  The anticipated  gain/loss  associated
     with  the  sales   transaction  is  not  included   within  the  Pro  Forma
     Consolidated Condensed Statement of Operations.

(3)  The Oil  and  Gas Pro  Forma  adjustments  in the  Pro  Forma  Consolidated
     Condensed  Statement of Operations are tax effected at a rate of 38%, which
     represents  Calpine's  statutory  tax rate in the  United  States for those
     assets. Actual adjustments to Calpine's  Consolidated  Financial Statements
     to reflect this disposition may reflect a different effective tax rate.

(4)  The Saltend Pro Forma adjustments in the Pro Forma  Consolidated  Condensed
     Statement of Operations are tax effected at a rate of 30%, which represents
     Calpine's  statutory tax rate in the United Kingdom.  Actual adjustments to
     Calpine's Consolidated Financial Statements to reflect this disposition may
     reflect a different effective tax rate.

(5)  Represents income before discontinued operations and cumulative effect of a
     change in accounting principle.

(6)  The Pro Forma adjustments in the Unaudited Pro Forma Consolidated Condensed
     Statement of Operations  include certain sales,  general and administrative
     expenses  allocated  to SCCL  and UK OpCo and to our  Domestic  Oil and Gas
     Properties based on a proportion of base wages. Accordingly, these expenses
     have been included within the SCCL and UK OpCo and our Domestic Oil and Gas
     Properties income figures to determine the Pro Forma totals.  For the three
     months ended March 31, 2005,  these expenses  totaled $0.6 million and $0.7
     million for SCCL and UK OpCo and our  Domestic Oil and Gas  Properties  and
     production  assets,  respectively.  The Pro Forma  adjustments also include
     interest  expense that we expect to allocate to discontinued  operations in
     accordance  with  Emerging  Issues  Task Force  ("EITF")  Issue No.  87-24,
     "Allocation  of  Interest  to  Discontinued  Operations"  ("EITF  Issue No.
     87-24"). We include interest expense on debt which is required to be repaid
     as  a  result  of  a  disposal  transaction  in  discontinued   operations.
     Additionally,  other  interest  expense that cannot be  attributed to other
     operations  of Calpine is allocated  based on the ratio of net assets to be
     sold  less  debt that is  required  to be paid as a result of the  disposal
     transaction to the sum of total net assets of Calpine plus the consolidated
     debt of Calpine, excluding (a) debt of the discontinued operation that will
     be assumed  by the  buyer,  (b) known debt that will be paid as a result of
     the disposal  transaction  and (c) debt that can be directly  attributed to
     other operations of Calpine. For the three months ended March 31, 2005, the
     interest  expense  allocated  within the Unaudited  Pro Forma  Consolidated
     Condensed  Statement of  Operations  is $12.5  million and $4.9 million for
     SCCL and UK OpCo and our Domestic Oil and Gas Properties, respectively.
</FN>






                      Calpine Corporation and Subsidiaries
      Unaudited Pro Forma Consolidated Condensed Statement of Operations
                          Year Ended December 31, 2004
                  (In thousands, except for per share amounts)

                                                                                             Pro Forma
                                                                                               After
                                                                              Oil and Gas   Oil and Gas     Saltend        Final
                                                                   Actual     Adjustments   Adjustments   Adjustments    Pro Forma
                                                                                 (1)(6)                      (2)(6)
                                                                -----------   -----------   -----------   -----------   -----------
                                                                                                         
Revenue:
Electric generation and marketing revenue
  Electricity and steam revenue .............................   $ 5,683,063   $        --   $ 5,683,063   $  (385,244)  $ 5,297,819
  Transmission sales revenue ................................        20,003            --        20,003            --        20,003
  Sales of purchased power for hedging and optimization .....     1,651,767            --     1,651,767        (3,775)    1,647,992
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing revenue ..........     7,354,833            --     7,354,833      (389,019)    6,965,814
Oil and gas production and marketing revenue
  Oil and gas sales .........................................        63,153       (59,007)        4,146            --         4,146
  Sales of purchased gas for hedging and optimization .......     1,728,301            --     1,728,301            --     1,728,301
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas production and marketing revenue .......     1,791,454       (59,007)    1,732,447            --     1,732,447
Mark-to-market activities, net ..............................        13,532            --        13,532          (127)       13,405
Other revenue ...............................................        70,069            --        70,069          (880)       69,189
                                                                -----------   -----------   -----------   -----------   -----------
Total revenue ...............................................     9,229,888       (59,007)    9,170,881      (390,026)    8,780,855
                                                                -----------   -----------   -----------   -----------   -----------
Cost of revenue:
Electric generation and marketing expense
  Plant operating expense ...................................       795,975            --       795,975       (50,271)      745,704
  Transmission purchase expense .............................        85,514            --        85,514       (10,697)       74,817
  Royalty expense ...........................................        28,673            --        28,673            --        28,673
  Purchased power expenses for hedging and optimization .....     1,487,020            --     1,487,020        (4,758)    1,482,262
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing expense ..........     2,397,182            --     2,397,182       (65,726)    2,331,456
Oil and gas operating and marketing expense
  Oil and gas operating expense .............................        56,843       (48,261)        8,582            --         8,582
  Purchased gas expense for hedging and optimization ........     1,716,714            --     1,716,714            --     1,716,714
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas operating and marketing expense ........     1,773,557       (48,261)    1,725,296            --     1,725,296
Fuel expense ................................................     3,731,108       190,143     3,921,251      (228,279)    3,692,972
Depreciation, depletion and amortization expense ............       574,200       (81,590)      492,610       (28,862)      463,748
Oil and gas impairment ......................................       202,120      (202,120)           --            --            --
Operating lease expense .....................................       105,886            --       105,886            --       105,886
Other cost of revenue .......................................        90,742            --        90,742            --        90,742
                                                                -----------   -----------   -----------   -----------   -----------
Total cost of revenue .......................................     8,874,795      (141,828)    8,732,967      (322,867)    8,410,100
                                                                -----------   -----------   -----------   -----------   -----------
Gross Profit ................................................       355,093        82,821       437,914       (67,159)      370,755
(Income) loss from unconsolidated investments ...............        13,525           563        14,088            --        14,088
Equipment cancellation and impairment cost ..................        42,374            --        42,374            --        42,374
Long-term service agreement cancellation charge .............        11,334            --        11,334            --        11,334
Project development expense .................................        24,409            --        24,409            --        24,409
Research and development expense ............................        18,396            --        18,396            --        18,396
Sales, general and administrative expense ...................       239,347       (17,220)      222,127        (1,870)      220,257
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) from operations ...............................         5,708        99,478       105,186       (65,289)       39,897
Interest expense ............................................     1,140,802       (29,335)    1,111,467       (16,200)    1,095,267
Interest (income) ...........................................       (56,412)        2,009       (54,403)        1,598       (52,805)
Minority interest expense ...................................        34,735            --        34,735            --        34,735
(Income) from repurchase of various issuances of debt .......      (246,949)           --      (246,949)           --      (246,949)
Other expense (income), net .................................      (149,093)        3,276      (145,817)       24,520      (121,297)
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) before provision or (benefit) for
 income taxes ...............................................      (717,375)      123,528      (593,847)      (75,207)     (669,054)
Provision (benefit) for income taxes(3)(4)...................      (276,549)       47,057      (229,492)      (22,562)     (252,054)
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) from continuing operations(5) .................   $  (440,826)  $    76,471   $  (364,355)   $  (52,645)  $  (417,000)
                                                                ===========   ===========   ===========   ===========   ===========
Basic and diluted loss per common share:
  Weighted average shares of common stock outstanding........       430,775                                                 430,775
  Loss from continuing operations(5).........................         (1.02)                                                  (0.97)

- ------------
<FN>
(1)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     our  Domestic  Oil and Gas  Properties  were sold by  Calpine on January 1,
     2002.  The  results of these  assets have been  removed  from the Pro Forma
     Consolidated  Condensed  Statement of Operations.  The gain associated with
     the sales  transaction  is not included  within the Pro Forma  Consolidated
     Condensed Statement of Operations.

(2)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     SCCL and UK OpCo were sold by Calpine on  January 1, 2002.  The  results of
     SCCL  and UK  OpCo  have  been  removed  from  the Pro  Forma  Consolidated
     Condensed  Statement of Operations.  The anticipated  gain/loss  associated
     with  the  sales   transaction  is  not  included   within  the  Pro  Forma
     Consolidated Condensed Statement of Operations.

(3)  The Oil  and  Gas Pro  Forma  adjustments  in the  Pro  Forma  Consolidated
     Condensed  Statement of Operations are tax effected at a rate of 38%, which
     represents  Calpine's  statutory  tax rate in the  United  States for those
     assets. Actual adjustments to Calpine's  Consolidated  Financial Statements
     to reflect this disposition may reflect a different effective tax rate.

(4)  The Saltend Pro Forma adjustments in the Pro Forma  Consolidated  Condensed
     Statement of Operations are tax effected at a rate of 30%, which represents
     Calpine's  statutory tax rate in the United Kingdom.  Actual adjustments to
     Calpine's Consolidated Financial Statements to reflect this disposition may
     reflect a different effective tax rate.

(5)  Represents income before discontinued operations and cumulative effect of a
     change in accounting principle.

(6)  The Pro Forma adjustments in the Unaudited Pro Forma Consolidated Condensed
     Statement of Operations  include certain sales,  general and administrative
     expenses  allocated  to SCCL  and UK OpCo and to our  Domestic  Oil and Gas
     Properties based on a proportion of base wages. Accordingly, these expenses
     have been included within the SCCL and UK OpCo and our Domestic Oil and Gas
     Properties  income figures to determine the Pro Forma totals.  For the year
     ended  December  31,  2004,  these  expenses  totaled $1.7 million and $2.9
     million for SCCL and UK OpCo and our  Domestic Oil and Gas  Properties  and
     production  assets,  respectively.  The Pro Forma  adjustments also include
     interest  expense that we expect to allocate to discontinued  operations in
     accordance  with  Emerging  Issues  Task Force  ("EITF")  Issue No.  87-24,
     "Allocation  of  Interest  to  Discontinued  Operations"  ("EITF  Issue No.
     87-24"). We include interest expense on debt which is required to be repaid
     as  a  result  of  a  disposal  transaction  in  discontinued   operations.
     Additionally,  other  interest  expense that cannot be  attributed to other
     operations  of Calpine is allocated  based on the ratio of net assets to be
     sold  less  debt that is  required  to be paid as a result of the  disposal
     transaction to the sum of total net assets of Calpine plus the consolidated
     debt of Calpine, excluding (a) debt of the discontinued operation that will
     be assumed  by the  buyer,  (b) known debt that will be paid as a result of
     the disposal  transaction  and (c) debt that can be directly  attributed to
     other  operations  of Calpine.  For the year ended  December 31, 2004,  the
     interest  expense  allocated  within the Unaudited  Pro Forma  Consolidated
     Condensed  Statement of  Operations  is $14.6 million and $12.4 million for
     SCCL and UK OpCo and our Domestic Oil and Gas Properties, respectively.
</FN>






                      Calpine Corporation and Subsidiaries
      Unaudited Pro Forma Consolidated Condensed Statement of Operations
                          Year Ended December 31, 2003
                  (In thousands, except for per share amounts)

                                                                                             Pro Forma
                                                                                               After
                                                                              Oil and Gas   Oil and Gas     Saltend        Final
                                                                   Actual     Adjustments   Adjustments   Adjustments    Pro Forma
                                                                                 (1)(6)                      (2)(6)
                                                                -----------   -----------   -----------   -----------   -----------
                                                                                                         
Revenue:
Electric generation and marketing revenue
  Electricity and steam revenue .............................   $ 4,680,397   $        --   $ 4,680,397   $  (286,936)  $ 4,393,461
  Transmission sales revenue ................................        15,347            --        15,347            --        15,347
  Sales of purchased power for hedging and optimization .....     2,714,187            --     2,714,187        (1,896)    2,712,291
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing revenue ..........     7,409,931            --     7,409,931      (288,832)    7,121,099
Oil and gas production and marketing revenue
 Oil and gas sales ..........................................        59,156       (56,757)        2,399            --         2,399
  Sales of purchased gas for hedging and optimization .......     1,320,902            --     1,320,902            --     1,320,902
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas production and marketing revenue .......     1,380,058       (56,757)    1,323,301            --     1,323,301
Mark-to-market activities, net ..............................       (26,439)           --       (26,439)           --       (26,439)
Other revenue ...............................................       107,483            --       107,483        (1,246)      106,237
                                                                -----------   -----------   -----------   -----------   -----------
Total revenue ...............................................     8,871,033       (56,757)    8,814,276      (290,078)    8,524,198
                                                                -----------   -----------   -----------   -----------   -----------
Cost of revenue:
Electric generation and marketing expense
  Plant operating expense ...................................       663,045            (3)      663,042       (46,607)      616,435
  Transmission purchase expense .............................        46,455            --        46,455       (11,765)       34,690
  Royalty expense ...........................................        24,932            --        24,932            --        24,932
  Purchased power expenses for hedging and optimization .....     2,690,069            --     2,690,069        (6,781)    2,683,288
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing expense ..........     3,424,501            (3)    3,424,498       (65,153)    3,359,345
Oil and gas operating and marketing expense
  Oil and gas operating expense .............................        75,453       (55,461)       19,992            --        19,992
  Purchased gas expense for hedging and optimization ........     1,279,568            --     1,279,568            --     1,279,568
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas operating and marketing expense ........     1,355,021       (55,461)    1,299,560            --     1,299,560
Fuel expense ................................................     2,665,620       222,871     2,888,491      (185,696)    2,702,795
Depreciation, depletion and amortization expense ............       504,383       (72,766)      431,617       (31,511)      400,106
Oil and gas impairment ......................................         2,931        (2,931)           --            --            --
Operating lease expense .....................................       112,070            --       112,070            --       112,070
Other cost of revenue .......................................        42,270            --        42,270            26        42,296
                                                                -----------   -----------   -----------   -----------   -----------
Total cost of revenue .......................................     8,106,796        91,710     8,198,506      (282,334)    7,916,172
                                                                -----------   -----------   -----------   -----------   -----------
Gross Profit ................................................       764,237      (148,467)      615,770        (7,744)      608,026
(Income) loss from unconsolidated investments ...............       (75,804)           81       (75,723)           --       (75,723)
Equipment cancellation and impairment cost ..................        64,384            --        64,384            --        64,384
Long-term service agreement cancellation charge .............        16,355            --        16,355            --        16,355
Project development expense .................................        21,803          (573)       21,230            --        21,230
Research and development expense ............................        10,630            --        10,630            --        10,630
Sales, general and administrative expense ...................       216,471       (14,930)      201,541        (2,225)      199,316
                                                                -----------   -----------   -----------   -----------   -----------
Income from operations ......................................       510,398      (133,045)      377,353        (5,519)      371,834
Interest expense ............................................       706,307       (25,181)      681,126        (7,206)      673,920
Distributions on trust preferred securities .................        46,610            --        46,610            --        46,610
Interest (income) ...........................................       (39,716)        2,277       (37,439)          425       (37,014)
Minority interest expense ...................................        27,330            --        27,330            --        27,330
(Income) from repurchase of various issuances of debt .......      (278,612)           --      (278,612)           --      (278,612)
Other expense (income), net .................................       (46,126)        1,063       (45,063)         (925)      (45,988)
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) before provision or benefit for income taxes ..        94,605      (111,204)      (16,599)        2,187       (14,412)
Provision (benefit) for income taxes(3)(4)...................         8,495       (42,331)      (33,836)          656       (33,180)
                                                                -----------   -----------   -----------   -----------   -----------
Income from continuing operations(5) ........................   $    86,110   $   (68,873)  $    17,237   $     1,531   $    18,768
                                                                ===========   ===========   ===========   ===========   ===========
Basic earnings per common share:
  Weighted average shares of common stock outstanding .......       390,772                                                 390,772
  Income from continuing operations(5) ......................          0.22                                                    0.05
Diluted earnings per common share:
  Weighted average shares of common stock outstanding
   before dilutive effect of certain convertible
   securities (5)............................................       396,219                                                 396,219
  Income from continuing operations(5).......................          0.22                                                    0.05

- ------------
<FN>
(1)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     our  Domestic  Oil and Gas  Properties  were sold by  Calpine on January 1,
     2002.  The  results of these  assets have been  removed  from the Pro Forma
     Consolidated  Condensed  Statement of Operations.  The gain associated with
     the sales  transaction  is not included  within the Pro Forma  Consolidated
     Condensed Statement of Operations.

(2)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     SCCL and UK OpCo were sold by Calpine on  January 1, 2002.  The  results of
     SCCL  and UK  OpCo  have  been  removed  from  the Pro  Forma  Consolidated
     Condensed  Statement of Operations.  The anticipated  gain/loss  associated
     with  the  sales   transaction  is  not  included   within  the  Pro  Forma
     Consolidated Condensed Statement of Operations.

(3)  The Oil  and  Gas Pro  Forma  adjustments  in the  Pro  Forma  Consolidated
     Condensed  Statement of Operations are tax effected at a rate of 38%, which
     represents  Calpine's  statutory  tax rate in the  United  States for those
     assets. Actual adjustments to Calpine's  Consolidated  Financial Statements
     to reflect this disposition may reflect a different effective tax rate.

(4)  The Saltend Pro Forma adjustments in the Pro Forma  Consolidated  Condensed
     Statement of Operations are tax effected at a rate of 30%, which represents
     Calpine's  statutory tax rate in the United Kingdom.  Actual adjustments to
     Calpine's Consolidated Financial Statements to reflect this disposition may
     reflect a different effective tax rate.

(5)  Represents income before discontinued operations and cumulative effect of a
     change in accounting principle.

(6)  The Pro Forma adjustments in the Unaudited Pro Forma Consolidated Condensed
     Statement of Operations  include certain sales,  general and administrative
     expenses  allocated  to SCCL  and UK OpCo and to our  Domestic  Oil and Gas
     Properties based on a proportion of base wages. Accordingly, these expenses
     have been included within the SCCL and UK OpCo and our Domestic Oil and Gas
     Properties  income figures to determine the Pro Forma totals.  For the year
     ended  December  31,  2003,  these  expenses  totaled $2.1 million and $3.3
     million for SCCL and UK OpCo and our  Domestic Oil and Gas  Properties  and
     production  assets,  respectively.  The Pro Forma  adjustments also include
     interest  expense that we expect to allocate to discontinued  operations in
     accordance  with  Emerging  Issues  Task Force  ("EITF")  Issue No.  87-24,
     "Allocation  of  Interest  to  Discontinued  Operations"  ("EITF  Issue No.
     87-24"). We include interest expense on debt which is required to be repaid
     as  a  result  of  a  disposal  transaction  in  discontinued   operations.
     Additionally,  other  interest  expense that cannot be  attributed to other
     operations  of Calpine is allocated  based on the ratio of net assets to be
     sold  less  debt that is  required  to be paid as a result of the  disposal
     transaction to the sum of total net assets of Calpine plus the consolidated
     debt of Calpine, excluding (a) debt of the discontinued operation that will
     be assumed by the buyer,  (b) known debt that will be paid as a result
     of the disposal transaction and (c) debt that can be directly attributed to
     other  operations  of Calpine.  For the year ended  December 31, 2003,  the
     interest  expense  allocated  within the Unaudited  Pro Forma  Consolidated
     Condensed Statement of Operations is $7.2 million and $7.3 million for SCCL
     and UK OpCo and our Domestic Oil and Gas Properties, respectively.
</FN>






                      Calpine Corporation and Subsidiaries
      Unaudited Pro Forma Consolidated Condensed Statement of Operations
                          Year Ended December 31, 2002
                  (In thousands, except for per share amounts)

                                                                                             Pro Forma
                                                                                               After
                                                                              Oil and Gas   Oil and Gas     Saltend        Final
                                                                   Actual     Adjustments   Adjustments   Adjustments    Pro Forma
                                                                                 (1)(6)                      (2)(6)
                                                                -----------   -----------   -----------   -----------   -----------
                                                                                                         
Revenue:
Electric generation and marketing revenue
Electricity and steam revenue ...............................   $ 3,237,510   $        --   $ 3,237,510   $  (205,779)  $ 3,031,731
  Sales of purchased power for hedging and optimization .....     3,145,991            --     3,145,991            (2)    3,145,989
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing revenue ..........     6,383,501            --     6,383,501      (205,781)    6,177,720
Oil and gas production and marketing revenue
  Oil and gas sales .........................................        63,514       (36,464)       27,050            --        27,050
  Sales of purchased gas for hedging and optimization .......       870,466            --       870,466             1       870,467
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas production and marketing revenue .......       933,980       (36,464)      897,516             1       897,517
Mark-to-market activities, net ..............................        21,485            --        21,485            --        21,485
Other revenue ...............................................        10,787            --        10,787          (104)       10,683
                                                                -----------   -----------   -----------   -----------   -----------
Total revenue ...............................................     7,349,753       (36,464)    7,313,289      (205,884)    7,107,405
                                                                -----------   -----------   -----------   -----------   -----------
Cost of revenue:
Electric generation and marketing expense
  Plant operating expense ...................................       522,906            --       522,906       (39,740)      483,166
  Transmission purchase expense .............................        25,486            --        25,486       (10,179)       15,307
  Royalty expense ...........................................        17,615            --        17,615            --        17,615
  Purchased power expenses for hedging and optimization .....     2,618,445            --     2,618,445            --     2,618,445
                                                                -----------   -----------   -----------   -----------   -----------
   Total electric generation and marketing expense ..........     3,184,452            --     3,184,452       (49,919)    3,134,533
                                                                -----------   -----------   -----------   -----------   -----------
Oil and gas operating and marketing expense
  Oil and gas operating expense .............................        69,840       (43,315)       26,525            --        26,525
  Purchased gas expense for hedging and optimization ........       821,065            --       821,065            --       821,065
                                                                -----------   -----------   -----------   -----------   -----------
   Total oil and gas operating and marketing expense ........       890,905       (43,315)      847,590            --       847,590
Fuel expense ................................................     1,792,323       126,520     1,918,843      (161,048)    1,757,795
Depreciation, depletion and amortization expense ............       398,889       (66,744)      332,145       (32,082)      300,063
Oil and gas impairment ......................................         3,399        (3,399)           --            --            --
Operating lease expense .....................................       111,022            --       111,022            --       111,022
Other cost of revenue .......................................         7,279            --         7,279            --         7,279
                                                                -----------   -----------   -----------   -----------   -----------
Total cost of revenue .......................................     6,388,269        13,062     6,401,331      (243,049)    6,158,282
                                                                -----------   -----------   -----------   -----------   -----------
Gross Profit ................................................       961,484       (49,526)      911,958        37,165       949,123
(Income) loss from unconsolidated investments ...............       (16,552)           --       (16,552)           --       (16,552)
Equipment cancellation and impairment cost ..................       404,737            --       404,737            --       404,737
Project development expense .................................        66,981        (1,778)       65,203            --        65,203
Research and development expense ............................         9,986            --         9,986            --         9,986
Sales, general and administrative expense ...................       186,056       (14,759)      171,297        (2,047)      169,250
                                                                -----------   -----------   -----------   -----------   -----------
Income from operations ......................................       310,276       (32,989)      277,287        39,212       316,499
Interest expense ............................................       402,677       (27,478)      375,199        (5,372)      369,827
Distributions on trust preferred securities .................        62,632            --        62,632            --        62,632
Interest (income) ...........................................       (43,086)          244       (42,842)          654       (42,188)
Minority interest expense ...................................         2,716            --         2,716            --         2,716
(Income) from repurchase of various issuances of debt .......      (118,020)           --      (118,020)           --      (118,020)
Other expense (income), net .................................       (34,200)          195       (34,005)       (2,130)      (36,135)
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) before provision or benefit for income taxes ..        37,557        (5,950)       31,607        46,060        77,667
Provision (benefit) for income taxes(3)(4) ..................        10,835        (2,403)        8,432        13,829        22,261
                                                                -----------   -----------   -----------   -----------   -----------
Income (loss) from continuing operations(5) .................   $    26,722     $  (3,547)  $    23,175   $    32,231   $    55,406
                                                                ===========   ===========   ===========   ===========   ===========
Basic earnings per common share:
  Weighted average shares of common stock outstanding .......       354,822                                                 354,822
  Income from continuing operations(5) ......................          0.07                                                    0.16
Diluted earnings per common share:
  Weighted average shares of common stock outstanding
   before dilutive effect of certain convertible
   securities (5)............................................       362,533                                                 362,533
  Income from continuing operations(5) ......................          0.07                                                    0.15

- ------------
<FN>
(1)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     our  Domestic  Oil and Gas  Properties  were sold by  Calpine on January 1,
     2002.  The  results of these  assets have been  removed  from the Pro Forma
     Consolidated  Condensed  Statement of Operations.  The gain associated with
     the sales  transaction  is not included  within the Pro Forma  Consolidated
     Condensed Statement of Operations.

(2)  The Pro Forma Consolidated  Condensed  Statement of Operations assumes that
     SCCL and UK OpCo were sold by Calpine on  January 1, 2002.  The  results of
     SCCL  and UK  OpCo  have  been  removed  from  the Pro  Forma  Consolidated
     Condensed  Statement of Operations.  The anticipated  gain/loss  associated
     with  the  sales   transaction  is  not  included   within  the  Pro  Forma
     Consolidated Condensed Statement of Operations.

(3)  The Oil  and  Gas Pro  Forma  adjustments  in the  Pro  Forma  Consolidated
     Condensed  Statement of Operations are tax effected at a rate of 38%, which
     represents  Calpine's  statutory  tax rate in the  United  States for those
     assets. Actual adjustments to Calpine's  Consolidated  Financial Statements
     to reflect this disposition may reflect a different effective tax rate.

(4)  The Saltend Pro Forma adjustments in the Pro Forma  Consolidated  Condensed
     Statement of Operations are tax effected at a rate of 30%, which represents
     Calpine's  statutory tax rate in the United Kingdom.  Actual adjustments to
     Calpine's Consolidated Financial Statements to reflect this disposition may
     reflect a different effective tax rate.

(5)  Represents income before discontinued operations and cumulative effect of a
     change in accounting principle.

(6)  The Pro Forma adjustments in the Unaudited Pro Forma Consolidated Condensed
     Statement of Operations  include certain sales,  general and administrative
     expenses  allocated  to SCCL  and UK OpCo and to our  Domestic  Oil and Gas
     Properties based on a proportion of base wages. Accordingly, these expenses
     have been included within the SCCL and UK OpCo and our Domestic Oil and Gas
     Properties  income figures to determine the Pro Forma totals.  For the year
     ended  December  31,  2002,  these  expenses  totaled $2.0 million and $3.8
     million for SCCL and UK OpCo and our  Domestic Oil and Gas  Properties  and
     production  assets,  respectively.  The Pro Forma  adjustments also include
     interest  expense that we expect to allocate to discontinued  operations in
     accordance  with  Emerging  Issues  Task Force  ("EITF")  Issue No.  87-24,
     "Allocation  of  Interest  to  Discontinued  Operations"  ("EITF  Issue No.
     87-24"). We include interest expense on debt which is required to be repaid
     as  a  result  of  a  disposal  transaction  in  discontinued   operations.
     Additionally,  other  interest  expense that cannot be  attributed to other
     operations  of Calpine is allocated  based on the ratio of net assets to be
     sold  less  debt that is  required  to be paid as a result of the  disposal
     transaction to the sum of total net assets of Calpine plus the consolidated
     debt of Calpine, excluding (a) debt of the discontinued operation that will
     be assumed  by the  buyer,  (b) known debt that will be paid as a result of
     the disposal  transaction  and (c) debt that can be directly  attributed to
     other  operations  of Calpine.  For the year ended  December 31, 2002,  the
     interest  expense  allocated  within the Unaudited  Pro Forma  Consolidated
     Condensed Statement of Operations is $5.2 million and $3.5 million for SCCL
     and UK OpCo and our Domestic Oil and Gas Properties, respectively.
</FN>



(c) Exhibits.

     10.1 Purchase and Sale  Agreement  dated July 7, 2005 by and among  Calpine
          Gas Holdings LLC,  Calpine  Fuels  Corporation,  Calpine  Corporation,
          Rosetta  Resources  Inc., and the other Subject  Companies  identified
          therein.

     99.1 Press Release dated July 7, 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 and Controller
                                           Chief Accounting Officer


Date: July 13, 2005





                                 EXHIBIT INDEX
                                 -------------

                Exhibit
                Number     Exhibit
                ------     -------

                 10.1      Purchase and Sale  Agreement  dated  July 7,  2005 by
                           by  and among Calpine Gas Holdings LLC, Calpine Fuels
                           Corporation,  Calpine  Corporation, Rosetta Resources
                           Inc., and  the other  Subject  Companies  identified
                           therein.

                 99.1      Press Release dated July 7, 2005




EXHIBIT 10.1.




          ------------------------------------------------------------

                           PURCHASE AND SALE AGREEMENT

          ------------------------------------------------------------


                            CALPINE GAS HOLDINGS LLC,
                      a Delaware limited liability company

                                       and

                           CALPINE FUELS CORPORATION,
                            a California corporation

                                   As Sellers,

                              CALPINE CORPORATION,
                             a Delaware corporation,

                              As Parent of Sellers,

                             ROSETTA RESOURCES INC.,
                             a Delaware corporation

                                    As Buyer,

                                       and

           certain parties identified herein as the Subject Companies

             -------------------------------------------------------

                                  July 7, 2005

             -------------------------------------------------------





                           PURCHASE AND SALE AGREEMENT

                                TABLE OF CONTENTS
                                -----------------


ARTICLE 1 DEFINITIONS..........................................................1

ARTICLE 2 SALE AND PURCHASE OF SUBJECT EQUITY.................................12
   2.1      Purchase and Sale.................................................12
   2.2      Sellers' Retained Liabilities.....................................12
   2.3      Preferential Rights and Consents..................................13
   2.4      Governmental Bonds................................................14

ARTICLE 3 PURCHASE PRICE......................................................14
   3.1      Purchase Price....................................................14
   3.2      Allocated Value...................................................14

ARTICLE 4 ADJUSTMENTS TO PURCHASE PRICE.......................................15
   4.1      Increases in Purchase Price.......................................15
   4.2      Decreases in Purchase Price.......................................15
   4.3      Schedule of Purchase Price Adjustments at Closing.................16

ARTICLE 5 REPRESENTATIONS AND WARRANTIES OF CALPINE AND SELLERS...............16
   5.1      Organization......................................................16
   5.2      Authority.........................................................16
   5.3      No Conflict.......................................................16
   5.4      Enforceability....................................................17
   5.5      Contracts.........................................................17
   5.6      Litigation and Claims.............................................17
   5.7      Financial Statements..............................................17
   5.8      No Liabilities....................................................18
   5.9      Subject Equity....................................................18
   5.10     Notices...........................................................18
   5.11     Imbalances........................................................18
   5.12     Current Commitments and AFEs......................................18
   5.13     Property Operation and Personal Property..........................19
   5.14     Take-or-Pay.......................................................19
   5.15     Tax Partnerships..................................................19
   5.16     Solvency..........................................................19
   5.17     Environmental Condition...........................................19

ARTICLE 6 REPRESENTATIONS AND WARRANTIES OF BUYER.............................19
   6.1      Organization......................................................19
   6.2      Authority.........................................................20
   6.3      No Conflicts......................................................20
   6.4      Enforceability....................................................20
   6.5      No Further Distribution...........................................20



                                       i


   6.6      Finder's Fees.....................................................20

ARTICLE 7 COVENANTS OF SELLER.................................................20
   7.1      Conduct of Business Pending Closing...............................20
   7.2      Tax Matters.......................................................21
   7.3      Satisfaction of Conditions........................................21

ARTICLE 8 COVENANTS OF BUYER..................................................21
   8.1      Satisfaction of Conditions........................................21

ARTICLE 9 CONDITIONS PRECEDENT TO THE OBLIGATIONS OF SELLER...................21
   9.1      Representations and Warranties....................................21
   9.2      Covenants.........................................................22
   9.3      No Litigation.....................................................22
   9.4      Consents..........................................................22

ARTICLE 10 CONDITIONS PRECEDENT TO THE OBLIGATIONS OF BUYER...................22
   10.1     Representations and Warranties....................................22
   10.2     Covenants.........................................................22
   10.3     No Litigation.....................................................22
   10.4     Consents..........................................................22
   10.5     Release of Liens..................................................22
   10.6     FIRPTA Certificate................................................22

ARTICLE 11 ENVIRONMENTAL MATTERS..............................................23
   11.1     Presence of Wastes, NORM, Hazardous Substances and Asbestos.......23

ARTICLE 12 TAX MATTERS........................................................23
   12.1     Tax Indemnification...............................................23
   12.2     Apportionment of Taxes............................................23
   12.3     Payment of Taxes..................................................24
   12.4     Resolution of Disagreements Between Buyer and Sellers.............24
   12.5     Cooperation.......................................................24

ARTICLE 13 SUSPENSE FUNDS HELD BY SELLER......................................24
   13.1     Suspense Funds Held By Seller.....................................24

ARTICLE 14 CLOSING............................................................25
   14.1     The Closing.......................................................25
   14.2     Closing Statement.................................................25
   14.3     Closing Deliveries................................................25

ARTICLE 15 POST-CLOSING ADJUSTMENTS...........................................26
   15.1     Final Settlement Statement........................................26
   15.2     Arbitration.......................................................26
   15.3     Payment of Final Purchase Price...................................26



                                       ii


ARTICLE 16 INDEMNIFICATION; RELEASES; ALLOCATION OF RISK......................27
   16.1     Calpine and Sellers' Indemnity....................................27
   16.2     Survival of Representations and Warranties........................28
   16.3     Buyer's Indemnity.................................................28
   16.4     Assumption by Buyer...............................................29
   16.5     Limitations of Warranties.........................................29
   16.6     Release of Pre-Closing Claims.....................................31
   16.7     Gas Balancing.....................................................33
   16.8     Acknowledgement by the Parties....................................33

ARTICLE 17 RISK OF LOSS.......................................................34
   17.1     Casualty Loss.....................................................34
   17.2     Buyer's Risk of Loss..............................................34

ARTICLE 18 TERMINATION AND REMEDIES...........................................34
   18.1     Termination.......................................................34
   18.2     Effect of Termination.............................................34

ARTICLE 19 ADDITIONAL COVENANTS...............................................35
   19.1     Further Assurances................................................35
   19.2     Transfer of Records...............................................35
   19.3     Use of Sellers' Name..............................................35
   19.4     Expenses, Fees and Taxes..........................................36
   19.5     Public Announcements..............................................36
   19.6     Confidentiality...................................................36
   19.7     Cooperation on Legal Matters; Preservation of Legal Privileges....37

ARTICLE 20 ARBITRATION........................................................38
   20.1     Arbitrators, Timing, Discovery, Finality of Determination.........38
   20.2     Confidentiality of Arbitration....................................38

ARTICLE 21 MISCELLANEOUS......................................................38
   21.1     Notice............................................................38
   21.2     Governing Law.....................................................40
   21.3     Assignment........................................................40
   21.4     Entire Agreement..................................................40
   21.5     Amendment; Waiver.................................................40
   21.6     Severability......................................................40
   21.7     Construction......................................................41
   21.8     Headings..........................................................41
   21.9     Counterparts......................................................41



                                       iii


EXHIBITS
- --------

Exhibit A - Subject Companies

Exhibit B - Leases

Exhibit B-1 - Non-Consent Leases

Exhibit C - Wells; Net Revenue Interests

Exhibit C-1 - Non-Consent Wells; Net Revenue Interests

Exhibit C-2 - Description of Rio Vista Gathering System Included in the
              Properties

Exhibit D - Allocated Values

Exhibit E - Form of Employee and Employee Benefits Matters Agreement

Exhibit F - Form of Transition Services Agreement

Exhibit G - Form of Assignment

Exhibit H - Form of Joint Defense Agreement



                                       iv


                           PURCHASE AND SALE AGREEMENT

     This Purchase and Sale  Agreement  (this  "Agreement")  is made and entered
into on July 7, 2005, by and among Calpine Gas Holdings LLC, a Delaware  limited
liability  company  ("Calpine  Gas"),  Calpine Fuels  Corporation,  a California
corporation  ("Calpine Fuels" and,  collectively  with Calpine Gas "Sellers" and
each a "Seller"),  Calpine  Corporation,  a Delaware  corporation  and parent of
Sellers ("Calpine"),  Rosetta Resources Inc., a Delaware corporation  ("Buyer"),
and each of the  signatories  hereto that are identified as "Subject  Companies"
(such Subject Companies, together with Sellers, Calpine, and Buyer, are referred
to herein as the "Parties").

                                    RECITALS

     WHEREAS,  Sellers wish to sell, and Buyer wishes to acquire, certain of the
Sellers' wholly owned  subsidiaries that will own and operate  substantially all
of the assets used in the oil and gas  exploration  and  production  business of
Calpine and its subsidiaries; and

     WHEREAS, immediately prior to the sale of the subsidiaries,  Calpine, which
is the parent of the Sellers,  will  contribute or be subject to an agreement to
contribute to certain of those subsidiaries all domestic oil and gas exploration
and production properties and assets owned by it; and

     WHEREAS,   simultaneously   with  the   consummation  of  the  transactions
contemplated  herein,  the Parties  will enter into certain  agreements  for the
transition of the business of the subsidiaries to Buyer.

     NOW,  THEREFORE,  in exchange for the mutual promises set forth herein, and
other  good and  valuable  consideration,  the  sufficiency  of which is  herein
acknowledged, the Parties agree as follows:

                                    ARTICLE 1
                                   DEFINITIONS

     "Adverse  Environmental  Condition"  means any  contamination  or condition
exceeding  regulatory limits and not otherwise permitted or authorized by Permit
or law, resulting from any discharge,  release, production,  storage, treatment,
seepage, escape, leakage, emission,  emptying,  leaching or any other activities
on, in or from any Property, or the migration or transportation from other lands
to any Property, of any wastes, pollutants, contaminants, hazardous materials or
other materials or substances  subject to regulation  relating to the protection
of the  environment  that require  Remediation  based upon the  condition at the
Effective Date pursuant to any current federal, state or local laws or statutes,
including the Environmental Laws.

     "AFEs" is defined in Section 5.12.

     "Affiliate"  means, with respect to any specified Person,  any other Person
directly or indirectly  controlling or controlled by or under direct or indirect
common control with such specified Person.  For the purposes of this definition,
"control"  means the power to direct the management and policies of such Person,






directly or indirectly,  whether through the ownership of voting securities,  by
contract  or  otherwise;  and the  terms  "controlling"  and  "controlled"  have
meanings  correlative  to the foregoing,  being  understood and agreed that with
respect to a  corporation  or other  entity,  control  means  direct or indirect
ownership of more than fifty  percent (50%) of the voting stock or securities of
such corporation or other entity. No member of the Calpine Group is an Affiliate
of a member of the Buyer Group, and no member of the Buyer Group is an Affiliate
of any member of the Calpine Group.

     "Agreement" is defined in the preamble.

     "Ancillary  Agreements"  means  the  Transfer  Agreement,   the  Transition
Services  Agreement,  the Employee Matters  Agreement,  and each other agreement
specifically named in this Agreement and entered into by and among any member of
the Calpine Group and any member of Buyer Group in  connection  with the closing
of the transactions set forth in this Agreement.

     "Annual Financial Statements" is defined in Section 5.7.

     "Applicable  Laws"  means  any  applicable  law,  order,  ordinance,  rule,
regulation,  Permit,  judgment or decree of any Governmental Body, including the
common  or civil law of any  Governmental  Body,  including  those  relating  to
occupational  safety and health,  consumer product safety,  environmental  laws,
securities laws, zoning laws or regulations,  employee benefits,  employment and
employment practices.

     "Assignments" is defined in Section 14.3.2.

     "Burdens"   means   royalties   (including   both  lessor   royalties   and
nonparticipating royalty interests),  overriding royalties, production payments,
and other similar obligations payable out of production.

     "Business Day" means each Monday, Tuesday,  Wednesday,  Thursday and Friday
which is not a day on which banks in San Jose, California or Houston, Texas, are
generally authorized or obligated, by law or executive order, to close.

     "Buyer" is defined in the preamble.

     "Buyer Business" means the oil and gas exploration and production  business
of the Subject  Companies that relates to the Properties,  but shall not include
the business of any member of the Calpine  Group that relates to any  properties
or assets  transferred by such Person prior to the date of this Agreement or any
of the Non-Consent Properties until transferred to a member of the Buyer Group.

     "Buyer  Group" means,  whether  existing now or in the future,  Buyer,  its
Subsidiaries  (including  the  Subject  Companies),  its  Affiliates,  and their
respective employees, officers, directors, agents and representatives.



                                       2


     "Buyer   Liabilities"  means  (without   duplication):   (i)  any  and  all
Liabilities  that are expressly  contemplated in this Agreement or any Ancillary
Agreement  to be assumed by any member of the Buyer Group;  (ii) all  agreements
and  Liabilities of any member of the Buyer Group under this Agreement or any of
the Ancillary Agreements subject to the applicable  limitations and restrictions
herein;  (iii) all Liabilities  (other than Taxes),  arising out of or resulting
from the ownership or operation of the  Properties,  whenever  arising,  whether
before  or after  the  Effective  Date,  including  (a)  accidents  or  injuries
associated with the Wells, the casings, and all other leasehold equipment in and
on the Wells, gathering lines, pipelines,  tanks and all other personal property
and  fixtures  used on or in  connection  with the  Properties,  (b) any and all
Proceedings  described on Schedule 5.6 except for those Proceedings set forth on
Schedule 2.2 and included  Sellers' Retained  Liabilities,  (c) the condition of
the Properties  including all Adverse  Environmental  Conditions,  including any
such  conditions  arising  out  of  or  relating  to  any  discharge,   release,
production, storage, treatment or any activities on or in the Properties, or the
migration or transportation from any other lands to the Properties (specifically
excluding  transportation and disposal by Sellers from the Properties to offsite
locations  prior to Closing),  whether  before or after the  Effective  Date, of
materials or substances that are at present, or become in the future, subject to
regulation  under  Applicable Laws or regulations,  whether such Applicable Laws
now  exist  or are  hereafter  enacted,  and (d) all  Plugging  and  Abandonment
obligations or liabilities;  and (iv) all  Liabilities of the Subject  Companies
reflected as such in the Financial  Statements.  Notwithstanding  the foregoing,
the Buyer Liabilities shall not include the Sellers' Retained Liabilities.

     "Buyer's Suspense Account" is defined in Article 13.

     "Calpine" is defined in the preamble.

     "Calpine  Business" means any business of the Calpine Group, other than the
Buyer Business.

     "Calpine Fuels" is defined in the preamble.

     "Calpine Gas" is defined in the preamble.

     "Calpine Group" means, whether existing now or in the future,  Calpine, its
Subsidiaries  (including  the Sellers,  but  excluding the Buyer and the Subject
Companies), its Affiliates, and their respective employees, officers, directors,
agents and representatives.

     "Casualty Loss" is defined in Section 17.1.

     "Claim" means any Loss relating to or arising out of any Proceeding.

     "Closing" is defined in Section 14.1.

     "Closing Date" is defined in Section 14.1.

     "CNGLP" means Calpine Natural Gas L.P., a Delaware limited partnership.



                                       3


     "Code" means the Internal Revenue Code of 1986.

     "Confidential Information" is defined in Section 19.6.

     "CPR" is defined in Article 20.

     "Cured Non-Consent Properties" is defined in Section 2.3.4.

     "Easements"  means  Calpine's,  any of  Sellers'  or  any  of  the  Subject
Companies  non-exclusive  rights  to the  use  and  occupancy  of  the  surface,
including,  without  limitation,  tenements,   appurtenances,   surface  leases,
easements,  Permits, licenses,  franchises,  servitudes and rights-of-way in any
way appertaining, belonging, affixed or incidental to or used in connection with
the ownership or operation of the Leases, whether recorded or unrecorded.

     "Effective Date" means 7:00 a.m., CDT on May 1, 2005.

     "Employee  Matters  Agreement"  means the Employee  and  Employee  Benefits
Matters  Agreement to be entered  into by and among  Calpine,  Sellers,  Calpine
Administrative Services Company, Inc. and Buyer in the form of Exhibit E.

     "Environmental  Condition"  means  any  condition  existing  prior  to  the
Effective  Date,  and only to the extent in existence on the Effective Date with
respect to the air,  land,  soil,  surface,  subsurface  strata,  surface water,
ground water,  or sediments which causes a Property to be subject to remediation
under,  or not in  compliance  with an  Environmental  Law, a Lease or  Material
Contract,  but  excluding  the  conditions  associated  with, or included in the
definition of, Plugging and Abandonment.

     "Environmental Law" means any existing Applicable Law relating to pollution
or the protection of the environment,  health or safety including, laws relating
to air, water,  land and the  generation,  storage,  treatment,  transportation,
handling,  release or disposal of waste  materials  including the Clean Air Act,
the Federal  Water  Pollution  Control  Act,  the Safe  Drinking  Water Act, the
Comprehensive Environmental Response, Compensation and Liability Act ("CERCLA"),
the  Superfund   Amendments  and  Reauthorization  Act  of  1986,  the  Resource
Conservation  and Recovery Act, the Hazardous and Solid Waste  Amendments Act of
1984, the Toxic Substance  Control Act, and the  Occupational  Safety and Health
Act,  but shall not include any  Applicable  Law  associated  with  Plugging and
Abandonment.

     "Equity  Interests" means, with respect to an entity, the limited liability
company interests,  limited partnership  interests,  partnership  interests,  or
capital shares (as the case may be) of such entity.

     "Excluded Properties" means the Calpine Business and the following:

     (a) all (i) trade credits, accounts receivable, notes receivables and other
receivables   attributable  to  the  interests  of  Calpine,  Sellers  or  their
Affiliates  in the  Properties  with  respect to any period of time prior to the



                                       4


Effective Date and (ii) deposits,  cash,  checks in process of collection,  cash
equivalents and funds attributable to the interests of Calpine, Sellers or their
Affiliates  in the  Properties  with  respect to any period of time prior to the
Effective Date;

     (b) all claims and causes of action of Calpine, Sellers or their Affiliates
(i) arising  from acts,  omissions  or events,  or damage to or  destruction  of
property  occurring  prior to the Effective Date to the extent related to any of
Sellers' Retained  Liabilities or any of indemnification  obligations of Calpine
or Sellers under this Agreement or (ii) affecting any of the excluded properties
set forth in this definition;

     (c) subject to the  provisions of Section 16.7, all  Hydrocarbons  produced
from or  attributable to the Properties with respect to all periods prior to the
Effective Date;

     (d) claims of Calpine, Sellers or any of their Affiliates for refunds of or
loss carry forwards with respect to (i) Taxes  attributable  to any period prior
to the Closing Date; (ii) Taxes  attributable to any of the excluded  properties
as set  forth in this  definition;  or (iii)  any Tax  credits  accruing  to the
Properties prior to the Closing Date;

     (e) all amounts due or payable to Calpine,  Sellers or their  Affiliates as
adjustments  or refunds  under any  contracts  affecting  the  Properties,  with
respect to any period prior to the Effective Date including, without limitation,
amounts recoverable from audits under operating agreements;

     (f) all amounts due or payable to Calpine,  Sellers or their  Affiliates as
adjustments to insurance  premiums related to the Properties with respect to any
period prior to the Effective Date;

     (g) all proceeds,  benefits,  income or revenues accruing (and any security
or  other  deposits  made)  with  respect  to (i) the  Properties  prior  to the
Effective  Date;  or (ii) any of the  excluded  properties  as set forth in this
definition;

     (h) all geological or geophysical information and data of Calpine,  Sellers
or their Affiliates,  whether proprietary to such Persons or licensed from Third
Parties,  but only to the extent that the transfer  thereof is prohibited by law
or third-party agreement and the necessary consents to transfer are not obtained
before  Closing or cannot be obtained in accordance  with the  provisions in the
Transition Agreement;

     (i) the  non-exclusive  right  reserved unto the Calpine,  Seller and their
Affiliates to use the Easements;

     (j) all the intellectual property of Calpine,  Sellers or their Affiliates,
including  but  not  limited  to  computer  software,  patents,  trade  secrets,
copyrights, names, marks, and logos related to the Calpine Business;

     (k)  originals  of all files  relating  to Sellers'  Retained  Liabilities,
Proceedings  set forth on Schedule 2.2 and copies (but not the originals) of all
files described in Section 19.2);



                                       5


     (l) all rights of  ingress,  egress and  surface  use  retained by Calpine,
Seller or their Affiliates in connection with its ownership and operation of CPN
Pipeline Company and its assets; and

     (m) all of the rights, titles,  interests and estates of Calpine or Sellers
in and to (x)  the  percentage  of  Non-Consent  Properties  and  related  Wells
described  in Exhibit  B-1 and C-1 and (y) to the  extent the same are  situated
upon,  used or held for use in connection  with the  Non-Consent  Properties and
related Wells, the properties,  rights, titles, interests and estates of Calpine
and Sellers  described or referred to in items (a) through (g) of the definition
of  "Properties",  but only until such time as such  Non-Consent  Properties are
transferred to Buyer.

     "Final Settlement Statement" is defined in Section 15.1.

     "Financial Statements" is defined in Section 5.7.

     "GAAP" means United States generally accepted accounting principles.

     "Governmental Body" means any federal, state, tribal, county, municipal, or
other federal,  state or local governmental  authority or judicial or regulatory
agency, board, body, department,  bureau,  commission,  instrumentality,  court,
tribunal  or  quasi-governmental  authority  in any  jurisdiction  (domestic  or
foreign) having  jurisdiction over the Subject Companies,  the Properties or any
Person who is a party to any of the transactions contemplated in this Agreement.

     "Group" means either of the Calpine  Group and Buyer Group,  as the context
requires.

     "Hydrocarbons"  means crude oil, natural gas,  casinghead gas,  condensate,
distillate,  sulphur,  natural gas liquids,  plant  products and other liquid or
gaseous hydrocarbons (including carbon dioxide), and all other minerals of every
kind and character which may be covered by or included in the Properties.

     "Indemnified Claims" is defined in Section 19.7.1.

     "Indemnitee" is defined in Section 19.7.1.

     "Indemnitor" is defined in Section 19.7.1.

     "Interim Financial Statements" is defined in Section 5.7.

     "Liability"  means, with respect to any Person, any liability or obligation
of such Person of any kind, character or description,  whether known or unknown,
absolute or contingent, accrued or unaccrued, disputed or undisputed, liquidated
or unliquidated,  secured or unsecured,  joint or several, due or to become due,
vested or  unvested,  executory,  determined,  determinable  or  otherwise,  and
whether or not the same is required to be accrued on the financial statements of
such Person.



                                       6


     "Lien" means any pledge,  lien,  mortgage,  charge,  encumbrance,  security
interest or other adverse claim.

     "Loss"  means all  damages,  losses,  Liabilities,  obligations,  payments,
amounts paid in settlement,  fines, penalties,  costs (including reasonable fees
and expenses of attorneys,  accountants and other professional advisors, as well
as experts,  and other costs of  investigation,  preparation  and  litigation in
connection  with any  pleading,  claim,  demand or other  action) of any kind or
nature whatsoever, whether known or unknown, contingent or vested, or matured or
unmatured.

     "Material Contracts" is defined in Section 5.5.

     "Net Revenue  Interest" means the interests of the Subject Companies in and
to all Hydrocarbons produced,  saved and sold from any Well described in Exhibit
C, after giving  effect to all Burdens and Liens other than Liens to be released
in Schedule 1; but excluding that portion of the net revenue  interest for those
Wells set forth in the column entitled "Non-Consent" on Exhibit C-1.

     "Non-Consent Properties" is defined in Section 2.3.2.

     "NORM" means naturally occurring radioactive material.

     "Parties" is defined in the preamble.

     "Permit"  means a material  license,  authorization,  permit,  variance and
similar right or interest from Governmental Bodies.

     "Permitted Encumbrances" means:

     (a) Burdens if the cumulative effect thereof does not operate to reduce the
Net  Revenue  Interest  in a Well  described  in Exhibit C below the Net Revenue
Interest for such Well set forth in Exhibit C or operate to increase the Subject
Companies'  Working  Interest in a Well  described in Exhibit C to more than the
Working  Interest  for such  Well set  forth in  Exhibit  C  (unless  there is a
corresponding increase in the Net Revenue Interest);

     (b) Division orders and sales contracts  terminable without penalty upon no
more than thirty (30) days notice to the purchaser;

     (c) Required third-party consents to assignment and similar agreements with
respect to which  waivers or  consents  (i) are  obtained  from the  appropriate
parties or (ii) are routinely  obtained after transfer  pursuant to transactions
of this nature, including preferential rights to purchase;

     (d)  Materialman's,   mechanic's,  repairman's,  employee's,  contractor's,
operator's,  Tax and other  similar  Liens or charges  arising  in the  ordinary
course of business for  obligations  (i) that are not delinquent or that will be



                                       7


paid and  discharged in the ordinary  course of business or (ii) if  delinquent,
that are being contested in good faith in the ordinary course of business;

     (e) All rights to consent by,  required  notices to, filings with, or other
actions by any  Governmental  Body in connection  with the sale or conveyance of
oil  and  gas  leases  or  interests  therein  if they  are  routinely  obtained
subsequent to the sale or conveyance;

     (f) Easements, rights-of-way, servitudes, Permits, surface leases and other
rights in  respect  of surface or  pipeline  operations  that do not  materially
interfere with oil and gas operations to be conducted on any Well or Lease;

     (g)  All  (i)  operating  agreements,   unit  agreements,   unit  operating
agreements, pooling agreements and pooling designations affecting the Properties
that are contained in  Calpine's,  Sellers' or the Subject  Companies'  files or
(ii) compulsory or commissioner's  pooling or units; provided that the effect of
any such documents will not reduce the Subject Companies'  interest with respect
to oil and gas produced  from any Well below the Net Revenue  Interest set forth
in Exhibit C, or increase the Subject  Companies'  Working Interest in such Well
to more than the Working  Interest  set forth in Exhibit C for such Well (unless
there is a corresponding increase in the Net Revenue Interest);

     (h)  Conventional  rights of  reassignment  prior to release  or  surrender
requiring notice to the holders of the rights;

     (i) All rights reserved to or vested in any Governmental Body to control or
regulate any of the Properties in any manner, and all Applicable Laws;

     (j) The terms and conditions of the Leases,  and of all agreements that are
contained in  Calpine's,  Sellers' or the Subject  Companies'  files or that are
recorded in the public records of the appropriate  jurisdiction and which do not
reduce the Subject Companies' interest with respect to oil and gas produced from
any Well below the Net Revenue Interest set forth in Exhibit C for such Well, or
increase the Subject  Companies'  Working Interest in such Well to more than the
Working  Interest  set  forth in  Exhibit  C for such  Well  (unless  there is a
corresponding increase in the Net Revenue Interest);

     (k) All  other  Liens,  contracts,  agreements,  instruments,  obligations,
defects and irregularities affecting the Properties which individually or in the
aggregate are not such as to interfere  materially with the operation,  value or
use of any of the  Properties,  could not  reasonably  be expected to prevent or
delay Buyer from receiving the proceeds of production from any Well and which do
not reduce the Subject Companies' interest with respect to Hydrocarbons produced
from any Well  below the Net  Revenue  Interest  set forth in Exhibit C for such
Well, or increase the Subject  Companies'  Working Interest in such Well to more
than the Working  Interest set forth in Exhibit C for such Well (unless there is
a corresponding increase in the Net Revenue Interest);

     (l) All  Liens  as set  forth  on  Schedule  1 which  will be  released  or
terminated  concurrently  with  the  closing  of the  transactions  contemplated
herein; and

     (m) Preferential rights to purchase as described in Section 2.3.2.



                                       8


     "Person" means any individual, corporation,  partnership, limited liability
company,  joint  venture,  association,  joint  stock  company,  trust,  estate,
unincorporated organization, other business entity or any Governmental Body.

     "Plugging and  Abandonment"  means all plugging,  replugging,  abandonment,
removal,  disposal or restoration associated with the Properties,  including all
plugging and  abandonment,  removal,  surface  restoration,  site  clearance and
disposal of the wells, structures and personal property located on or associated
with the  Properties,  the  removal or  capping  and  burying of all  associated
flowlines,  the restoration of the surface in accordance with Applicable Laws or
the terms and conditions of the applicable Leases,  site clearance,  as required
by Applicable Laws, and any disposal of related waste materials,  including NORM
and asbestos,  and shall include such Wells,  structures,  and personal property
associated  with any of the  Properties,  whether  drilled  or placed on a Lease
prior to, at, or after the Closing Date.

     "Preferential Rights Properties" is defined in Section 2.3.2.

     "Preliminary Purchase Price" is defined in Section 14.2.

     "Privilege" is defined in Section 19.7.2.

     "Proceeding" means any action, arbitration,  audit, hearing, investigation,
litigation  or  suit  (whether  civil,  criminal,  administrative,  judicial  or
investigative, whether formal or informal, whether public or private) commenced,
brought,   conducted  or  heard  by  or  before,  or  otherwise  involving,  any
Governmental Body or arbitrator.

     "Property"  or  "Properties"  means,  collectively,   all  of  the  Subject
Companies' right, title and interest in the following:

     (a) the oil,  gas and  other  mineral  leases  and  mineral  fee,  wellbore
interests and other interests and estates and the lands and premises  covered or
affected  thereby  which are  described  on Exhibit B but  excluding  all or any
undivided interests in and to the leases, leasehold interests or other interests
(or any portion thereof)  identified therein as "Non-Consent  Properties" as set
forth on Exhibit B-1  (collectively  called the  "Leases")  or which  Leases are
otherwise referred to herein;

     (b) (i) the properties pooled or unitized with any of the Leases;  (ii) all
unitization,  communitization,  pooling  agreements and  declarations  of pooled
units and the units created thereby (including,  without  limitation,  all units
created  under  orders,  regulations,  rules  or  other  official  acts  of  any
Governmental Body having jurisdiction and any units created solely among working
interest owners pursuant to operating  agreements or otherwise) which may affect
all or any  portion of the Leases  including,  without  limitation,  those units
which may be  described  or  referred  to on Exhibit B; and (iii) all  operating
agreements,  production sales or other contracts,  farmout  agreements,  farm-in
agreements,  area of mutual  interest  agreements,  equipment  leases  and other
agreements  which relate to the Leases or  interests in the Leases  described or
referred  to  herein  or on  Exhibit  B or to the  production,  sale,  purchase,
exchange,  processing,  handling,  storage,  transporting  or  marketing  of the
Hydrocarbons from or attributable to the Leases;



                                       9


     (c) all  Hydrocarbons  which may be produced and saved after the  Effective
Date from or attributable to the Subject Companies' interests in the Leases, the
lands pooled or unitized therewith,  including all saleable oil in tanks and all
rents, issues, profits,  proceeds,  products,  revenues and other income from or
attributable to the Leases and the lands pooled or unitized therewith;

     (d) all tenements,  hereditaments,  appurtenances and properties in anywise
appertaining,  belonging,  affixed or incidental to the Leases,  rights, titles,
interests and estates  described or referred to in paragraphs (a) and (b) above,
including any and all property,  real or personal,  situated upon,  used or held
for use in connection with the operating,  working or development of any of such
Leases  or the lands  pooled or  unitized  therewith  including  any and all oil
wells, gas wells,  injection wells or other wells (collectively,  such wells are
referred  to herein as "Wells"  and are more fully  described  on Exhibit C, but
excluding  that portion of the net revenue and working  interest for those Wells
set forth in the  column  entitled  "Non-Consent"  on Exhibit  C-1),  buildings,
structures,  field separators,  liquid  extraction  plants,  plant  compressors,
pumps,  pumping  units,  pipelines,  sales  and flow  lines,  gathering  systems
including  the  gathering  system  described  on Exhibit  C-2,  field  gathering
systems,  salt water disposal  facilities,  tanks and tank batteries,  fixtures,
valves,  fittings,  machinery and parts, engines,  boilers,  meters,  apparatus,
equipment,  appliances, tools, implements,  cables, wires, towers, casing tubing
and rods, surface leases,  rights-of-way,  easements,  servitudes,  licenses and
other surface and subsurface  rights  situated upon, used or held for use solely
in connection of the operating,  working or development of any of such Leases or
the  lands  pooled  or  unitized   therewith,   together  with  all   additions,
substitutions,  replacements,  accessions and  attachments to any and all of the
foregoing properties;

     (e)  interests  of  every  nature  in  and to the  Leases  rights,  titles,
interests and estates and every part and parcel thereof, including the Leases or
any other rights,  titles,  interests and estates as the same may be enlarged by
the discharge of any payments out of production or by the removal of any charges
or Permitted Encumbrances to which any of the Lease rights, titles, interests or
estates are  subject,  or  otherwise;  together  with any and all  renewals  and
extensions  of any of the  Lease  rights,  titles,  interests  or  estates;  all
contracts and agreements supplemental to or amendatory of or in substitution for
the contracts and agreements described or mentioned above;

     (f) all improvements,  tools,  parts and equipment used in connection with,
all or any part of the  Property  described  in this or any other clause of this
definition; and

     (g) to the extent transferable without material restriction or payment of a
transfer or licensing fee, all Records.

     Notwithstanding   anything  to  the  contrary  herein  or  otherwise,   the
Properties do not include,  and Calpine and Sellers do hereby EXCEPT and EXCLUDE
therefrom and do hereby RETAIN and RESERVE unto themselves, their successors and
assigns, the Excluded Properties.

     "Purchase Price" is defined in Section 3.1.

     "Records"  mean all of Calpine's  and Sellers'  Lease files,  abstracts and
title opinions, division order files, production records, well files, accounting
records  (but not  including  general  financial  accounting  or tax  accounting



                                       10


records),  and other  similar  files and records  which  directly  relate to the
Properties,  including  geological and  geophysical  data other than those which
Calpine or Sellers  consider to be  proprietary or  confidential  to it or which
Calpine or Sellers  cannot  provide to a member of the Buyer Group  without,  in
Calpine's or Sellers'  opinion,  breaching,  or  incurring a material  risk of a
breach of,  agreements with other parties,  or waiving,  or incurring a material
risk of waiving, legal privilege.

     "Remediation"  or "Remediate"  means  affirmative  actions or remedial work
taken to remove or otherwise  remedy an Environmental  Condition,  including any
survey, site assessment, audit, investigation,  inspection,  sampling, analysis,
removal,  excavation,  pump and treat, cleanup,  disposal,  storage, handling or
treatment, excluding those actions associated with Plugging and Abandonment.

     "Rules" is defined in Article 20.

     "Sellers" is defined in the preamble.

     "Sellers'  Actual  Knowledge"  means  the  actual  knowledge  of B.A.  Bill
Berilgen  (Executive  Vice  President of Calpine and  President-Calpine  Fuels),
Charles F.  Chambers  (Vice  President of CNGLP),  Roxy Blu (Director of Land of
CNGLP), Michael Rosinski (Chief Financial Officer of CNGLP), Ed Seeman (Director
Reservoir  Engineering of CNGLP),  Denise Bednorz (Controller of CNGLP), or Bert
Bates (Director of EH&S of CNGLP).

     "Sellers' Retained Liabilities" is defined in Section 2.2.

     "Straddle Period" is defined in Section 12.1.

     "Subject  Companies"  means,  collectively,  all of the entities  listed on
Exhibit A; and "Subject Company" means any one of them.

     "Subject Equity" means,  collectively,  all of the Equity Interests of each
of Rosetta Resources California,  LLC, Rosetta Resources Offshore,  LLC, Rosetta
Resources Rockies, LLC, Rosetta Resources Texas GP, LLC, Rosetta Resources Texas
LP, LLC, Calpine Natural Gas GP, LLC, and Calpine Natural Gas Holdings, LLC.

     A "Subsidiary"  of any Person means any  corporation or other  organization
whether  incorporated  or  unincorporated  of which at least a  majority  of the
securities  or interests  having by the terms thereof  ordinary  voting power to
elect at least a majority of the board of directors or others performing similar
functions with respect to such corporation or other  organization is directly or
indirectly  owned  or  controlled  by such  Person  or by any one or more of its
Subsidiaries, or by such Person and one or more of its Subsidiaries.

     "Taxes"  means  any  and  all  fees  (including   documentation,   license,
recording,  filing and registration fees), taxes (including income,  production,
gross receipts, ad valorem, value added, windfall profit tax, environmental tax,
turnover,  sales,  use,  personal  property  (tangible and  intangible),  stamp,
leasing, lease, user, leasing use, excise, franchise,  transfer,  heating value,
fuel, excess profits, occupational, interest equalization, lifting, oil, gas, or



                                       11


mineral  production or severance,  and other taxes),  levies,  imposts,  duties,
charges or withholdings of any nature  whatsoever,  imposed by any  Governmental
Body or taxing authority thereof, domestic or foreign, together with any and all
penalties,  fines, additions to tax and interest thereon, whether such tax shall
be existing or hereafter adopted.

     "Third Party" means a Person other than a Party or an Affiliate of a Party.

     "Transfer  Agreement" means that certain Transfer and Assumption  Agreement
dated, July 7, 2005 by and among Calpine and the Subject  Companies  pursuant to
which the Properties owned by Calpine will be conveyed to the Subject Companies.

     "Transition  Services Agreement" means the Transition Services Agreement in
the form of Exhibit F.

     "Working  Interest" means,  with respect to the Wells,  units or Leases set
forth in Exhibit C, the  interest  of the  Subject  Companies  therein,  without
regard to any valid  Burdens or Liens which is burdened  with the  obligation to
bear and pay costs of  operations;  but  excluding  that  portion of the working
interest  for those  Wells set forth in the  column  entitled  "Non-Consent"  on
Exhibit C-1 for those Wells.


                                   ARTICLE 2
                       SALE AND PURCHASE OF SUBJECT EQUITY

     2.1  Purchase  and Sale.  Subject  to the terms and  conditions  herein set
forth,  Sellers agree to sell,  assign,  convey and deliver to Buyer,  and Buyer
agrees to  purchase  and  acquire  from  Sellers at the  Closing all of Sellers'
right, title and interest in and to the Subject Equity.

     2.2  Sellers'  Retained  Liabilities.  Subject to the terms and  conditions
herein  set  forth,  the  following  Liabilities  (collectively,  the  "Sellers'
Retained  Liabilities")  shall  remain the sole  responsibility  of and shall be
retained, paid, performed and discharged solely by Calpine and Sellers (and with
regard to CNGLP,  Calpine  Natural Gas GP, LLC and Calpine Natural Gas Holdings,
LLC,  Calpine and Sellers  shall  assume,  perform and  discharge  the following
Liabilities and any Liabilities of the Calpine  Business for which any of CNGLP,
Calpine Natural Gas GP, LLC or Calpine Natural Gas Holdings,  LLC could have any
obligation to pay or perform) at and after the Closing:

          2.2.1 any  Liability  for  additional  payments  of  severance  taxes,
royalties,  overriding  royalties or other similar Burdens relating to the sales
to  Sellers  or any of  their  Affiliates  of  Hydrocarbons  produced  from  the
Properties prior to the Closing Date;

          2.2.2 any Liabilities expressly retained by Calpine, Sellers or any of
their Affiliates pursuant to the Employee Matters Agreement;

          2.2.3 any  Liability  for Taxes of Calpine,  Sellers,  or any of their
Affiliates  (i)  attributable  to all  taxable  periods  ending on or before the
Closing Date,  (ii) for the portion of any taxable period that includes but does



                                       12


not end on the Closing Date, or (iii) that may be imposed on any member of Buyer
Group under section 1.1502-6 of the Treasury  regulations  promulgated under the
Code or any analogous  provision of state or local law or regulation as a result
of the affiliation of Buyer or its Affiliates with Calpine or Sellers; and

          2.2.4  any  Liability  arising  out of any  Proceeding  set  forth  on
Schedule 2.2.

     2.3 Preferential Rights and Consents.

          2.3.1 In connection with the transfers of certain of the Properties to
the Subject  Companies,  Calpine and Sellers have requested (in accordance  with
the  documents  creating  such  rights  and/or  requirements)  all  consents  to
assignment (or waivers to such consents) that, to Sellers' Actual Knowledge, are
necessary in order for Calpine to consummate  the transfer of the  Properties to
the Subject Companies pursuant to the Transfer  Agreement.  The Parties agree to
use  commercially  reasonable  efforts to obtain such  consents or waivers  (but
Calpine  and Sellers  shall have no  obligation  to assure that such  waivers or
consents are  obtained).  On or before the Closing,  Sellers will, or will cause
the  appropriate  member of the Calpine Group to, give notice to all Persons who
hold  preferential  rights to purchase any of the Properties in accordance  with
the documents creating such rights and/or requirements.

          2.3.2  Notwithstanding  that  Calpine  and  Sellers may not be able to
obtain waivers of the preferential  rights to purchase or consents to assignment
which are necessary in order to convey the Properties to the Subject  Companies,
the Parties shall  proceed with Closing.  Prior to the Closing and in accordance
with the Transfer Agreement,  Calpine and Sellers (i) will assign to the Subject
Companies  the  Properties,   including  any  Properties  that  are  subject  to
preferential  rights to  purchase  ("Preferential  Right  Properties"),  for the
Purchase  Price set  forth  herein,  and (ii)  retain  all  rights to any of the
Properties that are subject to consents that are not received before the Closing
("Non-Consent Properties"). The Purchase Price shall be reduced by the allocated
value of Non-Consent  Properties as set forth in Exhibit D (with a corresponding
adjustment  of any of the  items  in  Section  4.1  or 4.2  that  relate  to the
Non-Consent  Properties).  The Preferential Right Properties were transferred to
the Subject Companies subject to the applicable preferential rights to purchase.

          2.3.3 From and after the Closing, Calpine shall continue to hold title
to the  Non-Consent  Properties  subject to the  provisions of this Section 2.3.
Buyer  (directly or  indirectly  through one of the Subject  Companies;  for the
purposes of this  Section 2.3,  Buyer shall also  include the Subject  Companies
following the Closing)  shall  manage,  operate and market  production  from the
Non-Consent  Properties pursuant to the applicable  provisions of the Transition
Services  Agreement.  Buyer, with the cooperation of Calpine and Sellers,  shall
continue for a six (6) month  period  immediately  following  the Closing to use
commercially reasonable efforts to obtain any waivers of the preferential rights
relating to the Preferential  Right Properties and consents to the assignment of
the Non-Consent  Properties,  provided that the Parties shall have no obligation
to pay any amount to obtain such consent or waivers.

          2.3.4 If during the six (6) month period after the Closing  Date,  the
Parties are able to obtain consents to transfer any Non-Consent Properties (such
Properties are referred to herein as the "Cured Non-Consent  Properties"),  then
such Properties shall be transferred to Buyer (or the Subject Company designated



                                       13


by it) in accordance with the provisions of this Section 2.3.4.  Promptly at the
end of each month  during such six (6) month  period after the Closing Date (but
not more than five (5) days thereafter), Calpine shall transfer to Buyer (or the
Subject   Company   designated  by  it),  and  Buyer  shall  purchase  from  the
transferring  party, any Cured  Non-Consent  Properties for which the consent to
assign was obtained during the preceding month. The purchase price for the Cured
Non-Consent  Properties  shall be the allocated  value of such properties as set
forth in  Exhibit  D,  with a  corresponding  adjustment  of any of the items in
Section 4.1 or 4.2 that relate to the Cured Non-Consent  Properties  through the
date of the  transfer to Buyer (or the Subject  Company  designated  by it). The
purchase price for the Cured  Non-Consent  Properties  shall be paid by Buyer in
immediately  available funds. The purchase of the Cured  Non-Consent  Properties
shall be on the same terms and subject to the same  provisions of this Agreement
(other than the purchase price determined in accordance with this Section 2.3.4)
as applicable  to the  Properties  that were  conveyed  pursuant to the Transfer
Agreement.  Any Non-Consent Properties for which consents have not been obtained
during the six (6) month period after the Closing  shall remain with Calpine and
shall no longer be subject to this Agreement.

          2.3.5 If any rights to purchase any of Preferential  Right  Properties
are exercised and consummated  following the Closing Date, Buyer (or the Subject
Company  designated  by it) shall be entitled to retain all of the amounts  paid
therefor and shall have all obligations  and Liability  relating to the transfer
thereof  to the  purchasing  party,  including  any  Liability  relating  to the
allocation of the Purchase Price to the Preferential Right Properties.

     2.4  Governmental  Bonds.  Attached hereto as Schedule 2.4 is a list of all
bonds placed by Calpine and CNGLP with a Governmental Body for the ownership and
operation of the Properties.  At or prior to the Closing, Buyer shall deliver to
Calpine and Sellers evidence reasonably satisfactory to Calpine and Sellers that
a member  of the  Buyer  Group  has  posted  bonds or other  security  with each
applicable  Governmental  Body  to  own  and,  where  appropriate,  operate  the
Properties in accordance with the requirements of such Governmental  Body. Where
such  bonds or other  security  are  placed in the name of CNGLP and will not be
replaced at Closing,  Buyer agrees that the Purchase Price shall be increased in
the aggregate  amount of such bonds or other security to the extent that Calpine
or CNGLP has paid any amounts in connection  therewith.  Buyer shall  indemnify,
defend and hold harmless Calpine, Sellers and their Affiliates for any Liability
that is assessed  against any bond or other security  listed on Schedule 2.4, or
for the taking or conversion thereof, that occurs on or after the Closing.

                                   ARTICLE 3
                                 PURCHASE PRICE

     3.1 Purchase Price. The total purchase price to be paid by Buyer to Sellers
for the Subject  Equity shall be One Billion Six Million  Five Hundred  Thousand
Dollars  ($1,006,500,000)  (the  "Purchase  Price"),  subject to any  applicable
adjustments as provided in this Agreement, including Article 4.

     3.2  Allocated  Value.  Sellers  and  Buyer  agree and  stipulate  that the
Allocated Values set forth for the Properties in Exhibit D have been established
solely for use in  calculating  adjustments  to the  Purchase  Price as provided
herein,  such schedule of Allocated  Values being solely for the  convenience of



                                       14


the  Parties.  Sellers and Buyer do not intend that such  schedule of  Allocated
Values be treated or  interpreted  to  constitute  an allocation of the Purchase
Price among the Properties for federal or state income tax purposes.

                                   ARTICLE 4
                          ADJUSTMENTS TO PURCHASE PRICE

     The Purchase Price shall be adjusted as follows:

     4.1 Increases in Purchase  Price.  The Purchase Price shall be increased by
an amount equal to the sum of the following amounts:

          4.1.1 The  amount of costs and  expenses  (other  than  administrative
overhead addressed by the fixed charge below) actually paid or to be paid by any
of  Calpine,  Sellers,  the Subject  Companies  or their  Affiliates  related to
owning,  operating,  producing and maintaining the Properties from the Effective
Date to the Closing Date, including capital expenditures,  plus a fixed overhead
charge of  $0.48/Mcfe  per month,  which shall be in lieu of any per-well  COPAS
administrative charges on wells operated by any of Calpine, Sellers, the Subject
Companies, or their Affiliates;

          4.1.2 The amount of all prepaid  expenses,  including  all Taxes based
upon or  measured  by  ownership,  relating  to the  Properties,  paid by any of
Calpine,  Sellers, the Subject Companies or their Affiliates and attributable to
periods of time after the Effective Date;

          4.1.3 The  amount of all  upward  adjustments  to the  Purchase  Price
provided for in this Agreement;

          4.1.4 The value of (a) all oil and other  Hydrocarbons in pipelines or
in tanks above the pipeline sales connection, in each case at the Effective Date
that is credited to the Properties and not sold by any of Calpine,  Sellers, the
Subject Companies or their Affiliates prior to Closing, (b) all unsold inventory
of gas plant products  attributable  to the Properties at the Effective Date and
not sold by any of Calpine,  Sellers,  the Subject Companies or their Affiliates
prior to  Closing,  each such  value to be the  market  or, if  applicable,  the
contract price in effect as of the Effective Date, less any applicable Taxes and
Burdens and (c) all gas imbalance volumes owed to any of Calpine,  Sellers,  the
Subject  Companies or their Affiliates by a Third Party as of the Effective Date
as estimated on Schedule 5.11, multiplied by $3.00 per Mcf; and

          4.1.5 Any other amount  provided for in this  Agreement as an increase
in the Purchase Price.

     4.2 Decreases in Purchase  Price.  The Purchase Price shall be decreased by
an amount equal to the sum of the following amounts:

          4.2.1 The amount of all proceeds paid or to be paid to any of Calpine,
Sellers, the Subject Companies or their Affiliates,  including proceeds from the
sale of production,  net of all applicable  Taxes and Burdens paid or to be paid
by  any  of  Calpine,  Sellers,  the  Subject  Companies  or  their  Affiliates,
attributable to the Properties for periods of time after the Effective Date;



                                       15


          4.2.2  An  amount  equal  to all  Taxes  based  upon  or  measured  by
ownership, relating to the Properties that are unpaid as of the Closing Date and
attributable to periods of time prior to the Effective Date;

          4.2.3 The value of all gas  imbalance  volumes owed by any of Calpine,
Sellers,  the Subject  Companies or their  Affiliates to a Third Party as of the
Effective Date as estimated on Schedule 5.11, multiplied by $3.00 per Mcf; and

          4.2.4 Any other amount provided for in this Agreement (including under
Section 2.3.3) as a decrease in the Purchase Price.

     4.3 Schedule of Purchase Price  Adjustments at Closing.  Attached hereto as
Schedule 4.3 is an estimate of the Purchase Price and related  adjustments as of
the Closing  Date that is based upon the  adjustments  in Sections  4.1 and 4.2.
Reference is made to Article 15 for post-closing  adjustments to be made for any
modification to such adjustments for actual amounts received after closing.

                                   ARTICLE 5
              REPRESENTATIONS AND WARRANTIES OF CALPINE AND SELLERS

     Calpine  and  each  of the  Sellers  represent  and  warrant,  jointly  and
severally,  to Buyer as to themselves  and as to each of the Subject  Companies,
that each of the  statements  made in this  Article 5 are true and correct as of
the date of this Agreement and will be true and correct as of the Closing Date.

     5.1 Organization. Calpine is a Delaware corporation validly existing and in
good standing under the laws of the State of Delaware.  Calpine Gas is a limited
liability  company  validly  existing and in good standing under the laws of the
State of Delaware.  Calpine Fuels is a corporation  validly existing and in good
standing  under  the  laws of the  State  of  California.  Each  of the  Subject
Companies is validly  existing and in good standing  under the laws of the State
of Delaware.  Sellers and each of the Subject Companies are in good standing and
duly qualified to do business in each other jurisdiction in which the conduct of
its business or ownership or leasing of its properties makes such  qualification
or registration necessary.

     5.2  Authority.  Calpine  and each  Seller has full power to enter into and
perform its obligations  under this Agreement and has taken all proper corporate
action to authorize  entering into this Agreement and performing its obligations
hereunder.

     5.3 No Conflict.  Neither the execution and delivery of this Agreement, nor
the consummation of the  transactions  contemplated  herein,  nor the compliance
with the terms  hereof  will (a) (i) result in any  default  under any  material
agreement or instrument relating to the Calpine Business to which Calpine or any
Seller is a party (including its governing  documents) or by which any of its or
its Affiliate's  assets or properties is bound or (ii) violate any order,  writ,
injunction, decree, statute, rule or regulation relating to the Calpine Business
to which  Calpine  or any Seller or to any of its or its  Affiliate's  assets or
properties; or (b) to Sellers' Actual Knowledge, (i) result in any default under
any material  agreement or  instrument  relating to the Buyer  Business to which
Calpine  or any  Seller  is a party  or by which  any of its or its  Affiliate's



                                       16


Properties  is bound,  or (ii)  violate  any order,  writ,  injunction,  decree,
statute,  rule or regulation  relating to the Buyer Business which is applicable
to  Calpine  or any  Seller  or to any of  its  or  its  Affiliate's  assets  or
properties;  other than  requirements to obtain (x) those consents to assignment
or waivers of  preferential  rights to purchase  from third parties set forth in
Schedule 5.3 and (y) approvals from any Governmental  Body customarily  obtained
post-closing.

     5.4 Enforceability.  This Agreement has been duly executed and delivered on
behalf of Calpine and each Seller and constitutes  the legal,  valid and binding
obligation  of each such  Persons,  enforceable  in  accordance  with its terms,
except as limited by bankruptcy or other  similar laws  applicable  generally to
creditors' rights and as limited by general equitable principles.

     5.5 Contracts. To Sellers' Actual Knowledge, Schedule 5.5 describes (a) all
area  of  mutual  interest  agreements  (other  than  area  of  mutual  interest
provisions  of  customary  joint  operating  agreements),  all  purchase or sale
agreements  (other  than with  respect to  production  of  Hydrocarbons  and the
disposition of field equipment in the ordinary course of business),  partnership
(other than tax  partnerships),  joint venture and/or exploration or development
program  agreements  relating to Wells and Leases or  otherwise  included in the
Properties, (b) all of the production sales, marketing and processing agreements
relating  to the  Wells  and  Leases,  other  than  such  agreements  which  are
terminable by any of Calpine,  Sellers or the Subject  Companies without penalty
on ninety (90) or fewer days' notice, and (c) any contracts or agreements (other
than  contracts  for utility  services)  burdening  the  Properties  which could
reasonably be expected to obligate the Subject  Companies to expend in excess of
$1,000,000  in  any  calendar  year  ((a)  -  (c)  collectively,  the  "Material
Contracts").  To Sellers' Actual Knowledge,  (x) none of Calpine, Sellers or the
Subject  Companies  has received  written  notice of its default in any material
respect under any of the Material  Contracts,  the Leases or the Easements;  (y)
the Material Contracts and the Leases are in full force and effect; and (z) none
of  Calpine,  Sellers or the  Subject  Companies  is in default in any  material
respect thereunder or under any Easement.

     5.6  Litigation  and  Claims.  Except  as set  forth on  Schedule  5.6,  no
Proceeding is pending or, to Sellers' Actual Knowledge,  threatened with respect
to Calpine,  Sellers or any Subject Company that could reasonably be expected to
materially  and  adversely  affect  the  Subject  Companies  or  the  ownership,
operation  or value of the  Properties  or the Buyer  Business,  or which  would
materially  adversely affect the ability of Calpine or Sellers to consummate the
transactions contemplated herein.

     5.7  Financial  Statements.  Calpine and Sellers  have  delivered  to Buyer
accurate and complete copies of (i) the audited  combined  balance sheets of the
Domestic Oil & Gas  Properties of Calpine and its  Affiliates as of December 31,
2003 and 2004, the related audited combined  statements of income,  equity,  and
cash  flows/changes  in financial  position for each of the years then ended and
the notes thereto (the "Annual  Financial  Statements");  and (ii) the unaudited
combined  balance sheets of the Domestic Oil & Gas Properties of Calpine and its
Affiliates as of March 31, 2005, and the related unaudited  combined  statements
of income,  equity, cash flows/changes in financial position for the three-month
period then ended and the notes  thereto (the  "Interim  Financial  Statements";
and,  collectively  with  the  Annual  Financial   Statements,   the  "Financial
Statements").   The  Financial   Statements  (i)  represent   actual  bona  fide



                                       17


transactions,  (ii) have been  prepared  from the books and  records of Calpine,
Sellers and the Subject  Companies  in  conformity  with GAAP applied on a basis
consistent  with  preceding  years  throughout the periods  involved,  and (iii)
accurately,  completely,  and fairly present the combined  financial position of
the assets of the domestic oil and gas  exploration  and production  business of
Calpine and its Affiliates as of the respective dates thereof and their combined
results of  operations  and cash  flows/changes  in  financial  position for the
periods then ended as if such companies were stand alone  entities,  except that
the Interim  Financial  Statements are subject to normal  year-end  adjustments,
which are not reasonably expected to be material in the aggregate.

     5.8 No Liabilities.  The Subject Companies have no existing, or to Sellers'
Actual  Knowledge,  threatened  material  Liability  other than  Liabilities (i)
incurred in the ordinary course of the Buyer Business since March 31, 2005; (ii)
that are less than  $1,000,000  individually;  (iii)  disclosed in the Financial
Statements or (iv) disclosed herein or in the Schedules hereto.

     5.9 Subject Equity.  Sellers are the sole,  record and beneficial owners of
the Subject Equity, and upon delivery of the Assignments to Buyer, Sellers shall
transfer good and marketable title to the Subject Equity,  free and clear of all
Liens. There are no rights, subscriptions,  warrants, options, conversion rights
or  agreements  of any kind  outstanding  to purchase or  otherwise  acquire any
interest in the Subject  Equity,  and there are no  authorized,  outstanding  or
existing proxies, voting trusts, equity holder agreements or other agreements or
understandings with respect to the voting of the Subject Equity. None of Calpine
or Sellers nor any agent  acting on their  behalf has offered any of the Subject
Equity for sale to any party which offer remains outstanding on the date hereof.

     5.10  Notices.  Except as set forth in Schedule  5.10,  to Sellers'  Actual
Knowledge,  (a) Calpine's and the Subject Companies' operation of the Properties
is not the  subject  of any  pending  regulatory  Proceedings  and  (b)  none of
Calpine,  Sellers and Subject  Companies has received written notice,  which has
not  heretofore  been complied  with, of any violation of Applicable  Law issued
with respect to any of the Properties.

     5.11  Imbalances.  To  Sellers'  Actual  Knowledge,  except as set forth on
Schedule  5.11,  there  are no gas or other  Hydrocarbon  production,  pipeline,
transportation  or processing  imbalances  existing as of the dates set forth in
Schedule  5.11 with respect to any of the  Properties,  other than those that do
not exceed $5,000 individually or relate to transactions  occurring less than 30
days before the date of this Agreement.

     5.12 Current  Commitments  and AFEs.  Schedule 5.12 contains a complete and
accurate list as of the date of this Agreement of (i) all pending authorizations
for  expenditures  ("AFEs") which commit any of Calpine,  Sellers or the Subject
Companies  in  excess  of  $250,000  to drill  or  rework  Wells or for  capital
expenditures  pursuant to any of the  Contracts  that have been  proposed by any
person on or after the  Effective  Date,  whether or not  accepted  by  Calpine,
Sellers,  the Subject Companies,  or any Third Party, and (ii) all AFEs and oral
or written  commitments  in excess of $250,000  to drill or rework  Wells or for
other capital expenditures pursuant to any of the Contracts for which all of the
activities  anticipated in such AFEs or  commitments  have not been completed by
the date of this Agreement.



                                       18


     5.13  Property  Operation  and  Personal   Property.   To  Sellers'  Actual
Knowledge,  the Wells have been  drilled,  completed,  operated,  developed  and
produced  in  material  compliance  with all  Applicable  Laws (other than those
relating to environmental matters, which are dealt with in Section 5.17) and all
necessary Permits (other than those relating to environmental matters, which are
dealt  with in  Section  5.17)  which  are  material  to the  ownership,  use or
operation of the  Properties  have been  obtained and are in force.  To Sellers'
Actual  Knowledge,   the  equipment  and  fixtures  located  on  the  Properties
constitutes the equipment and fixtures  reasonably  necessary for the operations
of the Properties for the production of the Hydrocarbons. To the Sellers' Actual
Knowledge,  such equipment and fixtures  currently in service are in good repair
and  operating  condition  and are  suitable  for the  purposes  for which  such
equipment and fixtures are employed.

     5.14  Take-or-Pay.  To Sellers'  Actual  Knowledge,  except as set forth on
Exhibit  C, no Subject  Company is  obligated,  under a  take-or-pay  or similar
arrangement, or by virtue of an election to non-consent, or not participate in a
past or current operation on the Properties pursuant to the applicable operating
agreement,  to  produce  Hydrocarbons,  or allow  Hydrocarbons  to be  produced,
without  receiving  full  payments  at the time of  delivery  in an amount  that
corresponds to the Net Revenue Interest in the Hydrocarbons  attributable to any
Well described in Exhibit C.

     5.15 Tax  Partnerships.  Except as disclosed on Schedule 5.15,  none of the
Properties is subject to or burdened by any partnership,  joint venture or other
arrangement  that is treated as a partnership  for federal and applicable  state
income tax purposes.

     5.16 Solvency.  Calpine and Sellers are not insolvent,  nor will Calpine or
Sellers be rendered insolvent by the occurrence of the transactions contemplated
in this  Agreement,  as such terms are used or defined in  applicable  state and
federal fraudulent conveyance or transfer laws.

     5.17  Environmental  Condition.  Except as set forth on Schedule  5.17,  to
Sellers'  Actual  Knowledge,  there are no pending  written  claims,  actions or
Proceedings by any Third Party or Governmental  Body caused by or arising out of
any Environmental Condition pending with regard to the ownership or operation of
the  Properties  and  there  are no  Environmental  Conditions  presently  under
Remediation with respect to the Properties.

                                   ARTICLE 6
                     REPRESENTATIONS AND WARRANTIES OF BUYER

     Buyer  represents  and  warrants to Calpine  and  Sellers  that each of the
statements  made in this  Article 6 are true and  correct as of the date of this
Agreement and will be true and correct as of the Closing Date.

     6.1  Organization.  Buyer is a  corporation  validly  existing  and in good
standing under the laws of the State of Delaware.  Buyer is in good standing and
duly qualified to do business in each other jurisdiction in which the conduct of
its business or ownership or leasing of its properties makes such  qualification
or registration necessary.



                                       19


     6.2  Authority.  Buyer  has  full  power  to enter  into  and  perform  its
obligations  under this Agreement and has taken all proper  corporate  action to
authorize entering into this Agreement and performing its obligations hereunder.

     6.3 No Conflicts. Neither the execution and delivery of this Agreement, nor
the consummation of the  transactions  contemplated  herein,  nor the compliance
with the terms hereof will result in any default under any material agreement or
instrument to which Buyer is a party  (including  its governing  documents),  or
violate  any  order,  writ,  injunction,  decree,  statute,  rule or  regulation
applicable to Buyer or any of its properties.

     6.4 Enforceability.  This Agreement has been duly executed and delivered on
behalf of Buyer and  constitutes  the legal,  valid and  binding  obligation  of
Buyer, enforceable in accordance with its terms, except as limited by bankruptcy
or other similar laws applicable  generally to creditor's  rights and as limited
by general equitable principles.

     6.5 No Further Distribution.  Buyer is acquiring the Subject Equity for its
own account and not with a view to, or for offer of resale in connection with, a
distribution  thereof,  within the  meaning of the  Securities  Act of 1933,  15
U.S.C.  ss.  77a et  seq.,  and any  other  Applicable  Laws  pertaining  to the
distribution of securities,  except in compliance with the applicable securities
laws.

     6.6 Finder's Fees. Except for fees payable to Friedman,  Billings, Ramsey &
Co., Inc.,  Buyer has not incurred any liability,  contingent or otherwise,  for
brokers' or finders'  fees in respect to this  transaction  for which any Seller
shall have any responsibility whatsoever.

                                   ARTICLE 7
                               COVENANTS OF SELLER

     7.1  Conduct  of  Business  Pending  Closing.  From the date  hereof to the
Closing  Date,  except  as  provided  herein  or in  Article  7 of the  Transfer
Agreement,  as  required  by any  obligation,  agreement,  Lease,  contract,  or
instrument  referred to on any Exhibit or Schedule or as otherwise  consented to
in  writing  by  Buyer,  Calpine  and each  Seller  shall,  or shall  cause  its
respective Subject Companies, to:

          7.1.1 Not (a) act in any manner with respect to the  Properties  other
than in the normal, usual and customary manner,  consistent with prior practice;
(b) dispose of,  encumber or relinquish  any of the  Properties  (other than any
relinquishment  resulting from the expiration of any Lease or Material  Contract
in  accordance  with its terms);  (c) waive,  compromise  or settle any material
right or claim with respect to any of the Properties; or (d) except with respect
to those  matters  identified  in  Schedule  5.12,  propose  capital or workover
expenditures  with respect to the  Properties  in excess of  $1,000,000  (net to
Calpine's, Sellers' or the Subject Companies' interest), except when required by
an  emergency  when there shall have been  insufficient  time to obtain  advance
consent  (provided,  that Calpine or Sellers will  promptly  notify Buyer of any
such emergency expenditures);

          7.1.2  Cooperate with Buyer in the  notification  of any  Governmental
Body of the  transactions  contemplated  herein  and  cooperate  with  Buyer  in
obtaining  the  issuance  by  each  such  authority  of such  Permits  as may be



                                       20


necessary  for  Buyer  to own  and  operate  the  Subject  Companies  and  their
respective Properties following the Closing;

          7.1.3 Use commercially  reasonable efforts,  when necessary in Buyer's
opinion, to seek appointment of one of the Subject Companies designated by Buyer
as the successor  operator to Calpine or Sellers with respect to all  Properties
currently operated by Calpine or Sellers;

          7.1.4  Until  Closing,  maintain  all  insurance  with  respect to the
Subject Companies and the Properties  currently in force with  approximately the
same coverages and limits as are in effect at the date hereof; and

          7.1.5 Obtain the  resignation,  or terminate the  positions,  of those
officers, directors, and managers of the Subject Companies as requested by Buyer
in writing prior to the Closing.

     7.2 Tax  Matters.  No extension of time to assess any Tax or settle any Tax
claim  relating to or in any way  affecting the  Properties  may be requested or
granted after the date of this  Agreement  without the prior written  consent of
Buyer. No election with respect to Taxes relating to or in any way affecting the
Properties  may be made or changed by Calpine or Sellers  after the date of this
Agreement without the prior written consent of Buyer.

     7.3  Satisfaction of Conditions.  Calpine and Sellers will use commercially
reasonable  efforts to  consummate,  make  effective  and comply with all of the
terms of this Agreement (including satisfaction,  but not waiver, of the Closing
conditions for which they are responsible or otherwise in control).

                                   ARTICLE 8
                               COVENANTS OF BUYER

     8.1  Satisfaction  of Conditions.  Buyer will use  commercially  reasonable
efforts to  consummate,  make effective and comply with all of the terms of this
Agreement (including satisfaction, but not waiver, of the Closing conditions for
which it is responsible or otherwise in control).

                                   ARTICLE 9
                CONDITIONS PRECEDENT TO THE OBLIGATIONS OF SELLER

     The  obligations  of Calpine  and Sellers to be  performed  at or after the
Closing  are  subject to the  fulfillment  (or waiver by Calpine  and Sellers in
their  sole  discretion),  before or at the  Closing,  of each of the  following
conditions:

     9.1 Representations  and Warranties.  The representations and warranties by
Buyer set forth in Article 6 and each of the Ancillary  Agreements shall be true
and correct in all material  respects at and as of the Closing as though made at
and as of the Closing.



                                       21


     9.2 Covenants. Buyer shall have performed and complied with in all material
respects all covenants and agreements  required to be performed and satisfied by
it pursuant to this  Agreement and each of the Ancillary  Agreements at or prior
to Closing.

     9.3 No  Litigation.  There shall be no Proceeding  pending or threatened to
restrain or prohibit the consummation of the  transactions  contemplated in this
Agreement.

     9.4  Consents.  All consents and approvals  required to be obtained  before
Closing shall have been obtained or shall have expired  without being  exercised
and have  therefore been waived,  except for those consents and approvals  which
are  customarily  obtained  after  closing  of  transactions  similar  to  those
contemplated herein and those relating to the Properties that have been excluded
from the transfers to the Subject Companies in accordance with Section 2.3.2.

                                   ARTICLE 10
                CONDITIONS PRECEDENT TO THE OBLIGATIONS OF BUYER

     The  obligations  of Buyer to be  performed  at or after  the  Closing  are
subject to the fulfillment (or waiver by Buyer in its sole  discretion),  before
or at the Closing, of each of the following conditions:

     10.1 Representations and Warranties.  The representations and warranties of
Calpine and Sellers set forth in Article 5 and each of the Ancillary  Agreements
shall be true and correct in all  material  respects at and as of the Closing as
though made at and as of the Closing; provided,  however, that in no event shall
the  failure  to obtain a  consent  or waiver  on  Schedule  5.3 (to the  extent
addressed in Section 2.3) or the existence of an Adverse Environmental Condition
cause a representation or warranty to be untrue or incorrect.

     10.2 Covenants.  Calpine and Sellers shall have performed and complied with
in all material  respects all covenants and agreements  required to be performed
and  satisfied  by them  pursuant to this  Agreement  and each of the  Ancillary
Agreements at or prior to Closing.

     10.3 No Litigation.  There shall be no Proceeding  pending or threatened to
restrain or prohibit the consummation of the  transactions  contemplated in this
Agreement.

     10.4 Consents.  All consents and approvals  required to be obtained  before
Closing shall have been obtained or shall have expired  without being  exercised
and have  therefore been waived,  except for those consents and approvals  which
are  customarily  obtained  after  closing  of  transactions  similar  to  those
contemplated herein and those relating to the Properties that have been excluded
from the transfers to the Subject Companies in accordance with Section 2.3.2.

     10.5 Release of Liens. All Liens of record burdening the Properties  (other
than Permitted  Encumbrances) shall be released at or before Closing and Calpine
and Sellers shall have made arrangements  reasonably acceptable to Buyer for the
payment and release of all Liens described on Schedule 1.

     10.6  FIRPTA  Certificate.  Each  Seller  shall have  delivered  to Buyer a
non-foreign   certificate  required  by  Section  1445  of  the  Code  to  avoid
withholding on any portion of the Purchase Price.



                                       22


                                   ARTICLE 11
                              ENVIRONMENTAL MATTERS

     11.1 Presence of Wastes,  NORM,  Hazardous  Substances and Asbestos.  BUYER
ACKNOWLEDGES  THAT THE  PROPERTIES  HAVE BEEN USED TO EXPLORE  FOR,  DEVELOP AND
PRODUCE  HYDROCARBONS,  AND THAT SPILLS OF WASTES,  CRUDE OIL,  PRODUCED  WATER,
HAZARDOUS   SUBSTANCES   AND  OTHER   MATERIALS  MAY  HAVE   OCCURRED   THEREON.
ADDITIONALLY,  THE  PROPERTIES,  INCLUDING  PRODUCTION  EQUIPMENT,  MAY  CONTAIN
ASBESTOS,  HAZARDOUS  SUBSTANCES OR NORM. NORM MAY AFFIX OR ATTACH ITSELF TO THE
INSIDE  OF  WELLS,  MATERIALS  AND  EQUIPMENT  AS SCALE OR IN OTHER  FORMS,  AND
NORM-CONTAINING  MATERIAL MAY HAVE BEEN BURIED OR  OTHERWISE  DISPOSED OF ON THE
PROPERTIES.  A HEALTH  HAZARD MAY EXIST IN  CONNECTION  WITH THE  PROPERTIES  BY
REASON THEREOF.  SPECIAL  PROCEDURES MAY BE REQUIRED FOR REMEDIATION,  REMOVING,
TRANSPORTING  AND DISPOSING OF ASBESTOS,  NORM,  HAZARDOUS  SUBSTANCES AND OTHER
MATERIALS FROM THE PROPERTY. With respect to the Properties owned by the Subject
Companies at the Closing and all Properties that may be subsequently transferred
pursuant  to Section  2.3,  Buyer  assumes  all  liability  for the  assessment,
Remediation,  removal,  transportation  and  disposal  of  these  materials  and
associated  activities in accordance with the applicable rules,  regulations and
requirements of any  Governmental  Body.  Buyer  understands that the Properties
were conveyed to the Subject Companies by Calpine or Sellers on an "as is, where
is" basis, and Buyer waives, and shall cause the Subject Companies to waive, all
claims  against the Sellers for the condition of the  Properties,  including any
Adverse Environmental Condition relating to the Properties.

                                   ARTICLE 12
                                   TAX MATTERS

     12.1 Tax Indemnification.  Calpine and Sellers shall indemnify,  defend and
hold  harmless  Buyer from and against (i) any  Liability  for Taxes of Calpine,
Sellers  or their  Affiliates  in respect of all  taxable  periods  ending on or
before the Closing Date,  (ii) any  Liability  for Taxes of Calpine,  Sellers or
their  Affiliates  for the portion of any taxable  period that includes but does
not end on the Closing Date (the  "Straddle  Period"),  and (iii) any  Liability
that may be imposed on any member of Buyer Group under  section  1.1502-6 of the
Treasury  regulations  promulgated under the Code or any analogous  provision of
state or local law or regulation as a result of the  affiliation of Buyer or its
Affiliates with Calpine or Sellers.

     12.2  Apportionment  of Taxes. All Straddle Period Taxes imposed on or with
respect to the Properties shall be prorated between Calpine and Sellers,  on the
one hand,  and Buyer,  on the other hand, as of the Closing  Date,  based on the
number of days in the calendar year before and after the Closing  Date.  Calpine
and Sellers shall be responsible  for those days up to and including the Closing
Date,  and Buyer shall be  responsible  for those days after the  Closing  Date.
Where  Taxes have not been  assessed  and are not yet  payable as of the Closing
Date,  the Parties  shall  estimate the Taxes as of the Closing Date (based upon
the prior year's Taxes) and prorate the estimated  Taxes  accordingly.  When the



                                       23


actual  amount of Taxes is known by the Parties,  the Parties  shall prorate the
actual  amount of Taxes to correct any  erroneous  payment  based on the earlier
proration of estimated Taxes.

     12.3 Payment of Taxes.  Subject to the  representations  and  warranties of
Calpine  and  Sellers  contained  herein,  any Tax in  respect of any Tax period
beginning  after  the  Closing  Date and that  portion  of any  Straddle  Period
beginning after the Closing Date shall be the responsibility of Buyer.

     12.4 Resolution of  Disagreements  Between Buyer and Sellers.  If Buyer, on
the one hand,  and  Calpine or Sellers,  on the other  hand,  disagree as to the
amount of Taxes for which each is liable under this  Agreement,  Buyer,  Calpine
and  Sellers  shall  promptly  consult  each other in an effort to resolve  such
dispute.  If any such point of disagreement cannot be resolved within sixty (60)
days of the initial  date of  consultation,  Buyer,  Calpine  and Sellers  shall
within  ten (10)  days  after  such  sixty  (60)  day  period  jointly  select a
nationally  recognized  independent public accounting firm which has not, except
pursuant to this Agreement,  performed any services for Buyer, Calpine,  Sellers
or their respective Affiliates, to act as an arbitrator to resolve, within sixty
(60) days after  their  selection,  all points of  disagreement  concerning  Tax
matters with respect to this Agreement and presented to such  accounting firm at
the  time of its  selection.  If no  nationally  recognized  independent  public
accounting firm meets the aforementioned standard, the Parties nonetheless shall
attempt to agree on an  accounting  or law firm that is  satisfactory  to all of
them.  If  Buyer,  Calpine  and  Sellers  cannot  agree on the  selection  of an
accounting or law firm within such ten (10) day period, within five (5) Business
Days  after such ten (10) day  period,  the  Parties  shall  select an  eligible
nationally recognized accounting firm by lot.

     12.5 Cooperation.

          12.5.1 Buyer shall  promptly  inform Calpine and Sellers if any taxing
authority asserts a claim, makes an assessment, or otherwise disputes the amount
of Taxes of any member of the Buyer  Group for which any  member of the  Calpine
Group is or may be liable  under  this  Agreement.  Calpine  and  Sellers  shall
conduct,  and Buyer shall have the right to reasonably cooperate in, the defense
of any Claim or Proceeding pertaining to Taxes for which indemnity may be sought
against any member of the Calpine Group. In the event of any Claim or Proceeding
relating to Taxes, Buyer, Calpine and Sellers shall cooperate in such matters in
the same manner as other legal matters in accordance with Section 19.7.

          12.5.2 Buyer,  Calpine and Sellers  agree,  upon  request,  to use, or
cause to be used,  commercially  reasonable efforts to obtain any certificate or
other  document  from  any  Governmental  Body  or any  other  Person  as may be
necessary  to  mitigate,  reduce  or  eliminate  any Tax that  could be  imposed
(including  but not limited to, with  respect to the  transactions  contemplated
hereby).

                                   ARTICLE 13
                         SUSPENSE FUNDS HELD BY SELLER

     13.1  Suspense  Funds Held By  Seller.  BUYER HAS PRIOR TO THE DATE OF THIS
AGREEMENT  OBTAINED A LIST OF ALL PROCEEDS FROM  PRODUCTION  ATTRIBUTABLE TO THE
PROPERTIES  THAT ARE CURRENTLY  HELD IN SUSPENSE  WHICH ARE OWING TO THIRD PARTY



                                       24


OWNERS OF ROYALTY,  OVERRIDING ROYALTY, WORKING OR OTHER INTERESTS IN RESPECT OF
PAST  PRODUCTION  OF  OIL,  GAS  OR  OTHER  HYDROCARBONS   ATTRIBUTABLE  TO  THE
PROPERTIES. AT THE CLOSING, THE SUBJECT COMPANIES SHALL HAVE CONTROL OF ALL SUCH
SUSPENDED PROCEEDS ("BUYER'S SUSPENSE  ACCOUNTS").  UPON CLOSING,  BUYER AND THE
SUBJECT  COMPANIES  SHALL  ADMINISTER  ALL SUCH  ACCOUNTS AND ASSUME ALL PAYMENT
OBLIGATIONS  RELATING TO THE SUSPENSE  FUNDS IN ACCORDANCE  WITH ALL  APPLICABLE
LAWS AND SHALL BE LIABLE FOR THE PAYMENT THEREOF TO THE PROPER PARTIES.

                                   ARTICLE 14
                                     CLOSING

     14.1 The  Closing.  The  closing of the  purchase  and sale of the  Subject
Equity  pursuant to this Agreement  ("Closing")  shall be held at the offices of
Thompson & Knight LLP, 333 Clay St., Suite 3300, Houston, Texas at 10:00 a.m. on
July 7, 2005 or such date as may be mutually agreed by the Parties (the "Closing
Date"),  provided  that the  Closing  shall not occur  until the  closing of the
transactions contemplated in the Transfer Agreement.

     14.2  Closing  Statement.  Sellers  shall  provide  Buyer  with  a  closing
statement  reflecting  its good  faith  estimation  of the  Purchase  Price  and
allocations  between  the  Sellers,  as  adjusted  pursuant  to  Article  4 (the
"Preliminary Purchase Price"), prior to the Closing.

     14.3 Closing Deliveries.  At Closing the following events shall occur, each
event under the control of a Party  hereto  being a condition  precedent  to the
events under the control of the other Party, and each event being deemed to have
occurred simultaneously with the other events:

          14.3.1 Buyer shall deliver via wire  transfer to an account  specified
by Sellers, in immediately available funds, the Preliminary Purchase Price;

          14.3.2  Each of Sellers  shall  execute,  acknowledge,  and deliver to
Buyer,  and Buyer  shall  accept  by  execution,  an  Assignment  of  Membership
Interest,  or Assignment of  Partnership  Interest,  as  applicable,  of all the
right,  title, and interest of that Seller in and to the Membership  Interest or
Partnership  Interest  of that  Seller  substantially  in the form of  Exhibit G
(collectively, the "Assignments");

          14.3.3 The Parties shall execute and deliver the  Transition  Services
Agreement;

          14.3.4  Calpine  and Buyer shall  execute  and  deliver  the  Employee
Matters Agreement;

          14.3.5  Calpine and Sellers shall have obtain and deliver the releases
of Liens described in Section 10.5; and

          14.3.6 Each Party shall  execute,  acknowledge  and deliver,  or shall
cause to be executed,  acknowledged,  and delivered,  division orders,  transfer
orders or letters in lieu thereof  directing all  purchasers of production  from



                                       25


the  Properties  to make  payment of proceeds  attributable  to such  production
occurring on or after the Effective Date to Buyer or the Subject  Companies,  or
designated by Buyer.

                                   ARTICLE 15
                            POST-CLOSING ADJUSTMENTS

     15.1 Final  Settlement  Statement.  After the  Closing  Date,  Buyer  shall
prepare,  in accordance  with this  Agreement,  a statement  ("Final  Settlement
Statement"),  a copy of which shall be delivered to Calpine and Sellers no later
than ninety (90) days after the Closing Date,  setting forth each  adjustment to
the Purchase  Price  necessary to determine  the Purchase  Price and showing the
calculation  of such  adjustments  in  accordance  with  Article 4.  Calpine and
Sellers  shall  have  thirty  (30) days after  receipt  of the Final  Settlement
Statement to review such  statement  and to provide  written  notice to Buyer of
Calpine's or Sellers'  objection to any item on the statement.  In reviewing the
Final  Settlement  Statement,  Calpine  and  Sellers  will  have  the  right  to
communicate with, and to review the work papers, schedules,  memoranda and other
documents  Buyer has  prepared  or reviewed  in  creating  the Final  Settlement
Statement and thereafter will have access to all relevant books and records, all
to the extent Calpine or Sellers  reasonably require to complete their review of
the Final  Settlement  Statement.  Sellers'  notice shall  clearly  identify the
item(s) objected to and the reasons and support for the objection(s). If Calpine
or Sellers  do not  provide  written  objection(s)  within  the thirty  (30) day
period, the Final Settlement  Statement shall be deemed correct and shall not be
subject  to  further   adjustment.   If  Calpine  or  Sellers   provide  written
objection(s)  within the thirty (30) day period, the Final Settlement  Statement
shall be deemed  correct  with  respect  to the items not  objected  to.  Buyer,
Calpine and Sellers  shall meet to negotiate and resolve the  objections  within
thirty (30) days of Buyer's receipt of Calpine's or Sellers' objections.  If the
Parties agree on all objections,  the adjusted Final Settlement  Statement shall
be deemed correct and shall not be subject to further adjustment.  Any items not
agreed to at the end of the thirty (30) day period may, upon any Party's written
request, be resolved by arbitration in accordance with Section 15.2.

     15.2  Arbitration.  If the Parties  cannot agree upon the Final  Settlement
Statement,  the dispute  shall be  promptly  submitted  to a mutually  agreeable
third-party accountant, which shall act as an arbitrator and promptly decide all
points of  disagreement  with  respect to the Final  Settlement  Statement.  The
decision of such  arbitrator  on all such points shall be final and binding upon
the Parties and shall be enforceable against any Party in any court of competent
jurisdiction. The costs and expenses of the such arbitrator shall be borne fifty
percent (50%) by Sellers and fifty percent (50%) by Buyer.

     15.3 Payment of Final  Purchase  Price.  If the Purchase Price shown on the
Final Settlement  Statement is more than the Preliminary  Purchase Price,  Buyer
shall pay such difference to Sellers in immediately  available funds within five
(5) Business  Days after the Final  Settlement  Statement has been agreed by the
Parties or decided by the arbitrator, as applicable. If the Purchase Price shown
on the Final Settlement  Statement is less than the Preliminary  Purchase Price,
Calpine  shall  cause  Sellers to pay such  difference  to Buyer in  immediately
available  funds  within  five (5)  Business  Days  after the  Final  Settlement
Statement  has been  agreed by the  Parties  or decided  by the  arbitrator,  as
applicable.



                                       26


                                   ARTICLE 16
                  INDEMNIFICATION; RELEASES; ALLOCATION OF RISK

     16.1 Calpine and Sellers' Indemnity.

          16.1.1  After  Closing and subject to the  provisions  of this Section
16.1, Calpine and each Seller shall jointly and severally indemnify, defend, and
hold harmless each member of the Buyer Group from and against any and all Losses
suffered by such member of the Buyer Group  arising from or relating to (without
duplication):

               16.1.1.1  the failure of any member of the Calpine  Group to pay,
perform or otherwise promptly discharge any of the Sellers' Retained Liabilities
in accordance with their respective terms;

               16.1.1.2  ownership or  operation of the Calpine  Business or any
Liability  of  any  member  of  the  Calpine  Group,   other  than  the  Buyer's
Liabilities;

               16.1.1.3 any breach  (subject to any  applicable  limitations  or
rights to cure that are set forth in this Agreement or the Ancillary Agreements)
by any member of the Calpine  Group of any  provision  of this  Agreement or any
Ancillary Agreement; and

               16.1.1.4 any untrue  statement of a material  fact or omission to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not misleading,  with respect to information that relates to
any  member of the  Calpine  Group but not  related  to  Buyer's  Business,  the
Properties or the Non-Consent Properties,  and that is provided by any member of
the Calpine Group to Buyer for inclusion in any offering  documents,  prospectus
or  registration  statement  used by Buyer in connection  with raising the funds
necessary  to  consummate  the  transactions  pursuant to this  Agreement or any
subsequent sale of the equity issued by Buyer in connection therewith.

SUCH  INDEMNIFICATION BY CALPINE AND SELLERS SHALL INCLUDE ANY LOSSES ARISING IN
WHOLE OR IN PART FROM THE SOLE OR CONCURRENT  NEGLIGENCE OR STRICT  LIABILITY OF
ANY MEMBER OF THE BUYER GROUP. WITH REGARD TO SELLERS' RETAINED  LIABILITIES AND
OWNERSHIP OR OPERATION OF THE CALPINE  BUSINESS (OTHER THAN BUYER  LIABILITIES),
CALPINE AND EACH SELLER HEREIN  RELEASES EACH MEMBER OF THE BUYER GROUP FROM AND
AGAINST  ANY AND ALL  CLAIMS  FOR  CONTRIBUTION  UNDER  CERCLA  AND/OR ANY OTHER
PRESENT OR FUTURE ENVIRONMENTAL LAW.

          16.1.2  Notwithstanding  the above, no member of the Buyer Group shall
have any right to bring any claim for  indemnification  pursuant to this Section
16.1,  and neither  Calpine nor any of Sellers shall have any obligation to make
any payment as indemnification hereunder:


                                       27


               16.1.2.1  with  regard to any Losses  covered by Section  16.1.1,
unless the amount to be recovered with respect to any  individual  item or group
of related items of Loss is reasonably expected to exceed $50,000 (provided that
any Losses relating to matters under Section 16.1.1.3 or 16.1.1.4 that cannot be
recovered  because of this restriction  shall be considered in the determination
of the amount in Section 16.1.2.2);

               16.1.2.2 with regard to any Losses covered by Section 16.1.1.3 or
16.1.1.4,  until such time as the Losses relating  thereto shall exceed,  in the
aggregate, $10,000,000; and

               16.1.2.3 with regard to any Losses covered by Section 16.1.1.3 or
16.1.1.4,  in no event shall Calpine or any of Sellers be liable for any amounts
hereunder  once  asserted  and paid Losses  paid by Calpine and Sellers  (either
collectively or individually) aggregate $100,000,000.

     16.2 Survival of Representations and Warranties.  Notwithstanding  anything
to the  contrary  contained  herein,  the  representations,  warranties  made by
Calpine,  Sellers and Buyer in this Agreement shall not survive the Closing Date
and shall not be actionable thereafter, except:

          16.2.1 the  representations  of  Calpine  and  Sellers in Section  5.9
(Subject  Equity)  shall  survive  until 30 days  after  the  date on which  the
statutes  of  limitation  applicable  to such  matters  expire  and shall not be
actionable thereafter;

          16.2.2 the representations of Calpine and Sellers in Section 5.15 (Tax
Partnerships)  shall  survive until 30 days after the date on which the statutes
of  limitation  applicable  to such matters  expire and shall not be  actionable
thereafter; and

          16.2.3 the  representations  and  warranties of Calpine and Sellers in
Sections 5.1 (Organization),  5.2 (Authority),  and 5.4  (Enforceability)  shall
survive  for one year  following  the Closing  Date and shall not be  actionable
thereafter;

          16.2.4 the  representations  and  warranties of Calpine and Sellers in
Sections  5.3 (No  Conflict)  and 5.16  (Solvency)  shall  survive for two years
following the Closing Date and shall not be actionable thereafter;

          16.2.5 the  representations  and  warranties  of Buyer in Sections 6.1
(Organization),  6.2 (Authority), and 6.4 (Enforceability) shall survive for one
year following the Closing Date and shall not be actionable thereafter; and

          16.2.6 the  representations and warranties of Buyer in Section 6.3 (No
Conflict)  shall survive for two years  following the Closing Date and shall not
be actionable thereafter.

     16.3 Buyer's Indemnity.

          16.3.1 Except to the extent of Sellers'  Retained  Liabilities,  after
Closing,  Buyer shall  indemnify,  defend and hold  harmless  each member of the
Calpine Group from and against any and all Losses suffered by such member of the
Calpine Group arising from or relating to (without duplication):

               16.3.1.1  the  failure  of any  member of the Buyer  Group or any
other  Person  to  pay,  perform  or  otherwise  promptly  discharge  any  Buyer
Liabilities in accordance with their respective terms;



                                       28


               16.3.1.2 the  ownership or operation of the Subject  Companies on
and after the Closing Date;

               16.3.1.3 any breach  (subject to any  applicable  limitations  or
rights to cure that are set forth in this Agreement or the Ancillary Agreements)
by any  member of the Buyer  Group of any  provision  of this  Agreement  or any
Ancillary Agreement; and

               16.3.1.4 any untrue  statement of a material  fact or omission to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not misleading,  with respect to all information (other than
the information  specifically  addressed by Section  16.1.1.4)  contained in any
offering  documents,  prospectus  or  registration  statement  used by  Buyer in
connection  with raising the funds  necessary  to  consummate  the  transactions
pursuant to this Agreement or any subsequent  sale of the equity issued by Buyer
in connection therewith.

SUCH  INDEMNIFICATION  BY BUYER SHALL INCLUDE ANY LOSSES  ARISING IN WHOLE OR IN
PART FROM THE SOLE OR CONCURRENT NEGLIGENCE OR STRICT LIABILITY OF ANY MEMBER OF
THE CALPINE GROUP.  WITH REGARD TO BUYER  LIABILITIES AND OWNERSHIP OR OPERATION
OF THE BUYER  BUSINESS,  BUYER HEREIN  RELEASES EACH MEMBER OF THE CALPINE GROUP
FROM AND AGAINST ANY AND ALL CLAIMS FOR  CONTRIBUTION  UNDER  CERCLA  AND/OR ANY
OTHER PRESENT OR FUTURE ENVIRONMENTAL LAW.

          16.3.2 Notwithstanding the above, no member of the Calpine Group shall
have any right to bring any claim for  indemnification  pursuant to this Section
16.3,  and  Buyer  shall  not  have  any  obligation  to  make  any  payment  as
indemnification hereunder:

               16.3.2.1  with  regard to any Losses  covered by Section  16.3.1,
unless the amount to Loss is  reasonably  expected to exceed  $50,000  (provided
that any Losses  relating to matters  under  Section  16.3.1.3 or 16.3.1.4  that
cannot be  recovered  because of this  restriction  shall be  considered  in the
determination of the amount in Section 16.3.2.2); and

               16.3.2.2 with regard to any matter covered by Section 16.3.1.3 or
16.3.1.4,  until  such time as Losses  relating  thereto  shall  exceed,  in the
aggregate, $10,000,000.

     16.4  Assumption  by Buyer.  Except  to the  extent  of  Sellers'  Retained
Liabilities,  effective at Closing, Buyer herein assumes and agrees to fully and
timely pay, perform, and discharge in accordance with their terms, all the Buyer
Liabilities.

     16.5 Limitations of Warranties.  Notwithstanding anything in this Agreement
to the contrary herein or otherwise,  Buyer understands that the Properties were
conveyed to and are held by the Subject Companies without recourse, covenant, or
warranty of any kind,  express,  implied,  or  statutory  from any member of the
Calpine Group, and that no member of the Calpine Group is providing any warranty
to Buyer (and have not made any warranty to any of the Subject  Companies)  with
respect  to the  Properties,  except  (i) to the  extent  of  Sellers'  Retained
Liabilities and as otherwise  contemplated by Section 16.1 and (ii) that Sellers
hereby warrant title to the Net Revenue  Interests and Working  Interests in the
Properties  as set forth in  Exhibit C (but  excluding  that  portion of the net
revenue and working interest set forth on Exhibit C-1 for those wells identified



                                       29


as "Non-Consent" on Exhibit C-1), subject to the Permitted Encumbrances, against
every  Person  whomsoever  lawfully  claiming  or to claim  the same or any part
thereof by, through, or under Sellers, but not otherwise.  WITHOUT LIMITATION OF
THE GENERALITY OF THE IMMEDIATELY  PRECEDING  SENTENCE,  EXCEPT TO THE EXTENT OF
SELLERS' RETAINED LIABILITIES AND AS OTHERWISE CONTEMPLATED IN SECTION 16.1, THE
PROPERTIES SHALL BE ASSIGNED OR CONVEYED AS-IS, WHERE-IS AND WITH ALL FAULTS AND
CALPINE  AND  SELLERS  EXPRESSLY  DISCLAIM  AND  NEGATE  ANY  IMPLIED OR EXPRESS
WARRANTY  OF (A)  MERCHANTABILITY,  (B) FITNESS FOR A  PARTICULAR  PURPOSE,  (C)
CONFORMITY  TO MODELS OR SAMPLES OF MATERIALS  AND (D) FREEDOM FROM  REDHIBITORY
VICES OR DEFECTS.  CALPINE AND SELLERS  ALSO  EXPRESSLY  DISCLAIM AND NEGATE ANY
IMPLIED OR EXPRESS  WARRANTY AT COMMON LAW, BY STATUTE OR OTHERWISE  RELATING TO
THE ACCURACY OF ANY OF THE  INFORMATION  FURNISHED WITH RESPECT TO THE EXISTENCE
OR EXTENT  OF  RESERVES  OR THE VALUE OF THE  PROPERTIES  BASED  THEREON  OR THE
CONDITION  OR STATE OF  REPAIR OF ANY OF THE  PROPERTIES;  THIS  DISCLAIMER  AND
DENIAL OF  WARRANTY  ALSO  EXTENDS TO THE EXPRESS OR IMPLIED  REPRESENTATION  OR
WARRANTY  AS TO THE PRICES  ANY  MEMBER OF THE BUYER  GROUP OR ANY MEMBER OF THE
CALPINE GROUP IS OR WILL BE ENTITLED TO RECEIVE FROM  PRODUCTION OF HYDROCARBONS
FROM THE  PROPERTIES,  IT BEING  UNDERSTOOD  THAT ALL  RESERVE,  PRICE AND VALUE
ESTIMATES  UPON WHICH  BUYER HAS RELIED OR IS RELYING  HAVE BEEN  DERIVED BY THE
INDIVIDUAL  EVALUATION OF BUYER.  BUYER (FOR ITSELF AND EACH MEMBER OF THE BUYER
GROUP) HEREIN WAIVES ANY WARRANTY OR  REPRESENTATION,  EXPRESS OR IMPLIED,  WITH
RESPECT  TO THE  ACCURACY,  COMPLETENESS  OR  MATERIALITY  OF  THE  INFORMATION,
REPORTS, PROJECTIONS, MATERIALS, RECORDS, AND DATA NOW, HERETOFORE, OR HEREAFTER
FURNISHED OR MADE  AVAILABLE TO BUYER IN CONNECTION  WITH THE PROPERTIES OR THIS
AGREEMENT (INCLUDING ANY DESCRIPTION OF THE PROPERTIES, WORKING INTERESTS OR NET
REVENUE  INTERESTS,  QUALITY  OR  QUANTITY  OF  HYDROCARBON  RESERVES  (IF ANY),
PRODUCTION   RATES,   RECOMPLETION   OPPORTUNITIES,   DECLINE   RATES,   PRICING
ASSUMPTIONS,  ABILITY OR  POTENTIAL  FOR  PRODUCTION  OF  HYDROCARBONS  FROM THE
LEASES,  ENVIRONMENTAL  CONDITION  OF  THE  PROPERTIES,  OR  ANY  OTHER  MATTERS
CONTAINED  IN ANY OTHER  MATERIAL  FURNISHED  OR MADE  AVAILABLE TO BUYER BY ANY
MEMBER OF THE CALPINE GROUP OR BY THEIR AGENTS OR REPRESENTATIVES).  ANY AND ALL
SUCH  INFORMATION,  REPORTS,  PROJECTIONS,  MATERIALS,  RECORDS,  AND DATA  NOW,
HERETOFORE OR HEREAFTER FURNISHED BY ANY MEMBER OF THE CALPINE GROUP IS PROVIDED
AS A  CONVENIENCE  ONLY AND ANY  RELIANCE  ON OR USE OF SAME IS AT BUYER'S  SOLE
RISK. WITH RESPECT TO THE EASEMENTS, CALPINE AND SELLERS EXPRESSLY DISCLAIM, AND
BUYER (FOR ITSELF AND EACH MEMBER OF THE BUYER GROUP) HEREIN WAIVES (BUT WITHOUT
PREJUDICE  TO ANY  MEMBER OF THE BUYER  GROUP'S  RIGHTS TO ENFORCE  ANY  SPECIAL
WARRANTY OF TITLE WITH RESPECT THERETO CONTAINED IN ANY ASSIGNMENT OR CONVEYANCE
RELATING TO THE PROPERTIES),  ANY WARRANTIES AND REPRESENTATIONS THAT CALPINE OR



                                       30


SELLERS OWN THE  EASEMENTS;  AND EXCEPT AS  EXPRESSLY  SET FORTH IN SECTION 5.5,
CALPINE  AND  SELLERS  DISCLAIM  ALL  WARRANTIES  OR  REPRESENTATIONS  THAT SUCH
EASEMENTS  ARE IN FORCE AND  EFFECT;  THAT THEY MAY BE  ASSIGNED;  THAT THEY ARE
CONTIGUOUS;  THAT THE PIPELINES LIE WITHIN THE EASEMENTS, OR THAT THEY GRANT THE
RIGHT TO LAY,  MAINTAIN,  REPAIR,  REPLACE,  OPERATE,  CONSTRUCT,  OR REMOVE ANY
PIPELINES.  If necessary,  Buyer shall (or shall cause the respective  member of
the Buyer Group to) secure its own rights and  Permits to operate  and  maintain
any pipelines or facilities  comprising a portion of the  Properties on the land
of others at its own expense.  Subject to the  provisions of Section 2.3, if any
consents or approvals of third  parties,  including any  Governmental  Body, are
required to assign the surface leases,  easements,  rights-of-way,  Permits,  or
other agreements with respect to the pipelines or facilities and are not secured
prior to Closing, Buyer shall (or shall cause the respective member of the Buyer
Group to) secure any  necessary  consents  to assign  and  approvals  at its own
expense;  provided,  however,  that  Calpine  and  Sellers  shall  provide  such
assistance  to Buyer to secure the consents and  approvals as may  reasonably be
required.  THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE FACE OF THIS AGREEMENT
AND  THE  ANCILLARY   AGREEMENTS.   BUYER   ACKNOWLEDGES  THAT  THIS  WAIVER  IS
CONSPICUOUS.

     16.6 Release of Pre-Closing Claims.

          16.6.1  Except as  provided  in Section  16.6.3,  effective  as of the
Closing  Date,  Calpine  does  hereby,  for itself and each other  member of the
Calpine Group,  and their  successors and assigns,  remise,  release and forever
discharge each member of the Buyer Group and their successors and assigns,  from
any and all Liabilities  whatsoever which are known,  actually or otherwise,  on
the date hereof to any member of the Calpine  Group (which  knowledge  shall not
include the knowledge, actual or otherwise, of any individual who is an employee
of any member of the Calpine  Group  immediately  preceding the Closing Date and
who becomes an  employee  of any member of the Buyer  Group on or within  ninety
(90) days after the Closing  Date),  whether at law or in equity  (including any
right of  contribution),  whether  arising under any contract or  agreement,  by
operation  of law or  otherwise,  existing  or  arising  from any acts or events
occurring or failing to occur,  or alleged to have occurred or to have failed to
occur,  or any  conditions  existing or alleged to have existed on or before the
date hereof.

          16.6.2  Except as  provided  in Section  16.6.3,  effective  as of the
Closing Date,  Buyer does hereby,  for itself and each other member of the Buyer
Group,  their  respective  successors and assigns,  remise,  release and forever
discharge each member of the Calpine Group, and their respective  successors and
assigns,  from any and all Liabilities  whatsoever which are known,  actually or
otherwise,  on the date hereof to any member of the Buyer Group (which knowledge
shall include the  knowledge,  actual or otherwise,  of any individual who is an
employee of any member of the Calpine  Group  immediately  preceding the Closing
Date and who  becomes an  employee of any member of the Buyer Group on or within
ninety (90) days after the Closing Date), whether at law or in equity (including
any right of contribution),  whether arising under any contract or agreement, by
operation  of law or  otherwise,  existing  or  arising  from any acts or events
occurring or failing to occur,  or alleged to have occurred or to have failed to
occur,  or any  conditions  existing or alleged to have existed on or before the
date hereof.



                                       31


          16.6.3 Nothing  contained in Section 16.6.1 or 16.6.2 shall impair any
right of any Person to enforce this  Agreement,  any Ancillary  Agreement or any
agreements,  arrangements,  commitments or understandings  that are specified in
this  Agreement  or in any  Ancillary  Agreement.  Nothing  contained in Section
16.6.1 or 16.6.2 shall release any Person from:

               (i)  any  Liability  retained  or  assumed  by,  or  transferred,
     assigned or allocated among the members of the Calpine Group or Buyer Group
     in accordance with this Agreement or any Ancillary Agreement;

               (ii)  any   Liability   for  or  related  to  the  sale,   lease,
     construction or receipt of goods, property or services purchased,  obtained
     or used by a member of the  Calpine  Group or Buyer  Group from a member of
     the other group in the ordinary course of business;

               (iii) any  Liability  that the Parties  may have with  respect to
     indemnification  or  contribution  pursuant  to this  Agreement  for claims
     brought  against the Parties,  any other member of such Party's  respective
     Group and their respective  Affiliates (except for any member of such other
     Party's Group) by third Persons,  which  Liability shall be governed by the
     provisions  of  this  Article  16  and,  if  applicable,   the  appropriate
     provisions of the Ancillary Agreements;

               (iv) any  Liability  the  release  of which  would  result in the
     release of any Person other than a Person released pursuant to this Section
     16.6;  provided  that the  Parties  agree not to bring  suit or permit  any
     members of their  respective  Group to bring suit  against  any Party,  any
     other  member  of  such  Party's  respective  Group  and  their  respective
     Affiliates  with  respect to any  Liability  to the extent that such Person
     would be released with respect to such Liability by this Section 16.6.3 but
     for the provisions of this clause (iv); or

               (v) any Liability  resulting from the actual fraud of such Person
     or its Affiliate.

          16.6.4  Calpine shall not make, and shall not permit any member of the
Calpine Group to make, any claim or demand, or commence any action asserting any
claim or demand,  including any claim of  contribution  or any  indemnification,
against any member of the Buyer Group, or any other Person released  pursuant to
Section  16.6.1,  with respect to any Liabilities  released  pursuant to Section
16.6.1. Buyer shall not make, and shall not permit any member of the Buyer Group
to make,  any claim or demand,  or commence  any action  asserting  any claim or
demand, including any claim of contribution or any indemnification,  against any
member of the Calpine Group,  or any other Person  released  pursuant to Section
16.6.2, with respect to any Liabilities released pursuant to Section 16.6.2.

          16.6.5  Except as expressly  set forth in Section  16.6.3,  each Party
intends through this Section 16.6 to provide for a full and complete release and
discharge  of all  Liabilities  existing  or  arising  from all acts and  events
occurring or failing to occur,  or alleged to have occurred or to have failed to
occur,  and all conditions  existing or alleged to have existed on or before the
date hereof,  between or among any member of the Calpine Group, on the one hand,



                                       32


and any member of the Buyer Group,  on the other hand (including any contractual
agreements  or  arrangements  existing or alleged to exist  between or among any
such members on or before the date  hereof).  At the  reasonable  request of any
other  Party,  each Party  shall cause each  member of its  respective  Group to
execute and deliver releases reflecting the provisions hereof

          16.6.6 Buyer, Sellers and Calpine each acknowledge that they have been
advised  by  their  legal  counsel  and are  familiar  with  the  provisions  of
California Section 1542, which provides as follows:

     "A GENERAL  RELEASE DOES NOT EXTEND TO CLAIMS  WHICH THE CREDITOR  DOES NOT
     KNOW OR SUSPECT TO EXIST IN HIS OR HER FAVOR AT THE TIME OF  EXECUTING  THE
     RELEASE,  WHICH IF KNOWN BY HIM OR HER MUST HAVE MATERIALLY AFFECTED HIS OR
     HER SETTLEMENT WITH DEBTOR." EACH OF BUYER, SELLERS AND CALPINE BEING AWARE
     OF SAID  CODE  SECTION,  HEREBY  EXPRESSLY  WAIVES  ANY  RIGHT  IT MAY HAVE
     THEREUNDER  AS WELL AS UNDER ANY OTHER  STATUTE OR COMMON LAW  PRINCIPLE OF
     SIMILAR EFFECT.

                    Buyer's Initials         Calpine's Initials

                    ----------------         ------------------


                                             Sellers' Initials

                                             -----------------

                                             -----------------

                                             -----------------

     16.7 Gas  Balancing.  The Parties  recognize  that as of the Effective Date
there are over and under imbalances with respect to gas production or processing
attributable to the Properties and herein agree that the Properties  acquired by
Buyer at  Closing  will be  conveyed  at  Closing  specifically  subject to such
imbalances,  with Buyer bearing and assuming all obligations with respect to any
overproduction account or liability associated with the Properties and receiving
the benefit of and being  credited  with any  underproduction  account or credit
existing as of the Effective Date with respect to the Properties. From and after
the Closing, Buyer shall indemnify,  defend and hold harmless each member of the
Calpine Group,  their  respective  successors and assigns,  and their respective
Affiliates,  directors,  officers,  equity holders and partners, as appropriate,
from all  Claims  or  Losses  arising  from  such  overproduction  accounts  and
liabilities.

     16.8  Acknowledgement by the Parties.  Each of the Parties by its execution
and delivery of this  Agreement does hereby  acknowledge  and agree that (i) any
claims  or  Losses  that it may  have  pursuant  to the  terms  of the  Transfer
Agreement are hereby  subject to the caps,  baskets and limits set forth in this
Agreement,  including  the  provisions of this Article 16, and (ii) the sole and
exclusive  remedy for any claims or Losses  arising  out of or  relating  to the
Transfer  Agreement  are  provided for in this  Agreement  except for any Losses
arising  from or  relating to the special  warranty  of title  contained  in the
conveyance as set forth in Exhibit C to the Transfer Agreement.  In the event of
any  conflict  between  the  provisions  of  this  Agreement  and  the  Transfer
Agreement, this Agreement shall control.



                                       33


                                   ARTICLE 17
                                  RISK OF LOSS

     17.1 Casualty  Loss. If, after the date hereof and prior to the Closing any
material  portion  of  the  Properties  owned  by  the  Subject   Companies  (or
transferable  thereto pursuant to the Transfer Agreement) shall be substantially
damaged or destroyed by fire or other  casualty,  or if any material  portion of
such Properties shall be taken by condemnation or the exercise of eminent domain
(in either case, a "Casualty  Loss"),  Buyer shall be entitled to any applicable
insurance  proceeds or  condemnation  awards and an  adjustment  to the Purchase
Price based upon the allocated value of the Property destroyed or harmed, to the
extent such loss is not covered by insurance or condemnation award.

     17.2 Buyer's Risk of Loss. Except as specifically  provided in Section 17.1
with  respect to any  Casualty  Loss,  Buyer shall  assume all risk of loss with
respect to any change in condition of the Properties  owned by Calpine,  Sellers
or the Subject  Companies (or transferable  pursuant to the Transfer  Agreement)
from the  Effective  Date and neither  Calpine  nor any  Sellers  shall have any
liability,  as operator of the  Properties or  otherwise,  for losses or damages
sustained  with respect to the  condition of the  Properties or their ability to
produce Hydrocarbons.

                                   ARTICLE 18
                            TERMINATION AND REMEDIES

     18.1 Termination. This Agreement may be terminated as provided below.

          18.1.1 The Parties may  terminate  this  Agreement  by mutual  written
consent at any time prior to the Closing Date.

          18.1.2  If the  transactions  contemplated  herein  do not close on or
before  July 7, 2005,  any Party may  terminate  this  Agreement  by delivery of
written  notice  to the  other  Parties;  provided,  however,  that no Party may
terminate this Agreement pursuant to this Section 18.1.2 if such Party's failure
to comply with its  obligations  under this Agreement  caused the Closing not to
occur on or before July 7, 2005.

          18.1.3  Buyer may  terminate  this  Agreement  by  delivery of written
notice to Calpine and  Sellers at any time prior to the  Closing  Date if, as of
the  Closing  Date,  Calpine  or any  Seller has  breached  any  representation,
warranty or covenant in this  Agreement in any  material  respect and Calpine or
any Seller has failed to cure such breach within a reasonable  time period after
receiving written notice of such breach.

          18.1.4  Calpine or Sellers may terminate this Agreement by delivery of
written  notice  to Buyer at any time  prior to the  Closing  Date if Buyer  has
breached  any  representation,  warranty or covenant  in this  Agreement  in any
material  respect and Buyer has failed to cure such breach  within a  reasonable
time period after receiving written notice of such breach.

     18.2 Effect of Termination. Each Party's right of termination under Section
18.1 is in  addition  to any other  rights it may have under this  Agreement  or



                                       34


otherwise, and the exercise of such right of termination will not be an election
of remedies.  If this  Agreement is  terminated  pursuant to Section  18.1,  all
obligations of the Parties under this Agreement will terminate.

                                   ARTICLE 19
                              ADDITIONAL COVENANTS

     19.1 Further  Assurances.  After the Closing,  the Parties  shall  execute,
acknowledge and deliver or cause to be executed, acknowledged and delivered such
instruments and take such other action as may be necessary or advisable to carry
out their  respective  obligations  under this  Agreement and under any exhibit,
document, certificate or other instrument delivered pursuant hereto. Calpine and
Sellers  shall use  commercially  reasonable  efforts to cooperate  with Buyer's
efforts to obtain all  approvals  and consents  required by or necessary for the
transactions  contemplated in this Agreement that are customarily obtained after
Closing.  Without limiting the foregoing, the Parties shall use all commercially
reasonable  efforts to cooperate  with one another in the  prosecution,  defense
and/or settlement of the claims and litigation matters,  including those matters
set forth on Schedule 5.6,  which relate to or arise in connection  with the oil
and gas business of any member of the Calpine Group or the Buyer Group.

     19.2 Transfer of Records.  Within thirty (30) days after  Closing,  Calpine
and each Seller shall deliver to Buyer,  at Calpine or Sellers'  address,  or at
such  other  place as any of same may be kept,  the  originals  of all  Records,
except that Calpine and each Seller may retain (a) the  originals of all Records
which are  related to the  Excluded  Properties,  in which case  Calpine or such
Seller shall deliver  duplicate copies of any such retained  originals to Buyer;
and (b) the originals of all accounting  Records,  in which case Calpine or such
Seller shall  deliver  duplicate  copies of any such  retained  originals  which
relate to the  Properties  to Buyer;  provided  that  Calpine and Sellers  shall
deliver the originals of all Records  relating to Cured  Non-Consent  Properties
when such  properties are  transferred to Buyer in accordance  with Section 2.3.
For a period of four (4) years after the date of Closing,  Buyer will retain the
Records  delivered to it pursuant hereto and will make such Records available to
Calpine  or any  Seller  upon  reasonable  notice  at  Buyer's  headquarters  at
reasonable times and during office hours. Without limiting the generality of the
foregoing,  Buyer,  Calpine  and  Sellers  shall  retain,  until the  applicable
statutes of limitations  (including all extensions) have expired,  copies of all
Tax returns,  supporting workpapers,  and other books and records or information
which may be  relevant to such  returns for all Tax periods or portions  thereof
ending before or including the Closing Date, and shall not destroy or dispose of
such  records or  information  without  first  providing  the other party with a
reasonable  opportunity to review and copy the same.  Buyer shall notify Calpine
and each Seller in writing  within thirty (30) days of the sale to a Third Party
of all or any part of the  Properties  which involves the transfer of any of the
Records of the name and address of the  buyer(s)  in any such sale.  Buyer shall
require as part of any such sales  transaction  that such Third Party assume the
obligations imposed on Buyer in this Section 19.2.

     19.3 Use of Sellers' Name. Buyer agrees that, as soon as practicable  after
the Closing, but in no event more than one hundred twenty (120) days thereafter,
it will remove or cause to be removed the names and marks "Calpine Corporation,"
"Calpine Fuels  Corporation,"  and all variations  and  derivatives  thereof and
logos relating  thereto from the Properties of which it has assumed  operations,
it will cause  CNGLP,  Calpine  Natural  Gas GP,  LLC and  Calpine  Natural  Gas
Holdings,  LLC to be  changed  to  remove  the  name  "Calpine",  and  will  not



                                       35


thereafter  make any use  whatsoever of such names,  marks and logos except with
the express written consent of Calpine.

     19.4  Expenses,  Fees and Taxes.  Calpine  shall pay all fees and  expenses
incident to the negotiation and preparation of this Agreement including those of
Thompson  &  Knight  LLP  and  Covington  &  Burling  and  consummation  of  the
transactions  contemplated herein;  provided that Buyer shall be responsible for
the cost of all fees for the  recording  of transfer  documents,  obtaining  all
bonds for the  operation  of the  properties,  and all other costs and  expenses
relating  to  the  operation  of  the  Properties   after  the  Effective  Date.
Notwithstanding  anything to the contrary herein,  it is acknowledged and agreed
by and between  Calpine and Sellers,  on the one hand,  and Buyer,  on the other
hand,  that the Purchase Price  excludes any sales taxes in connection  with the
sale of property or assets  pursuant to this Agreement.  If a  determination  is
ever made that a sales tax or other transfer tax applies,  Buyer shall be liable
for such Tax as well as any applicable conveyance,  transfer and recording fees,
and real estate  transfer  stamps or Taxes  imposed on any  transfer of property
pursuant to this Agreement.  Buyer shall  indemnify,  defend,  and hold harmless
Calpine and Sellers with respect to the payment of any of such Taxes,  including
any interest or penalties  assessed thereon.  The indemnity,  defense,  and hold
harmless  obligation  contained  in the  preceding  sentence  shall  survive the
Closing.  To the extent  permitted  by  Applicable  Law,  the  Parties  agree to
reasonably  cooperate  with  each  other  to  complete  any  and  all  exemption
certificates  or other  documents that exempt any of the Purchase Price from any
of such Taxes before either the Closing or the due date for such Tax.

     19.5  Public  Announcements.  The  Parties  agree  that prior to making any
public  announcement or statement with respect to the transactions  contemplated
by this  Agreement,  the Party  desiring  to make such  public  announcement  or
statement shall consult with the other Parties hereto and endeavor in good faith
to  obtain  approval  of the  other  Parties  hereto  to the  text  of a  public
announcement  or  statement  to be made solely by Sellers,  on the one hand,  or
Buyer,  on the other,  as the case may be;  provided,  however,  if Calpine  and
Sellers,  on the one hand, or Buyer,  on the other is required by any Applicable
Law or the  rules  of the New  York  Stock  Exchange  (or any  other  applicable
securities  exchange) to make such public  announcement  or statement,  then the
same may be made without the approval of any of the other Parties.

     19.6  Confidentiality.  The  Parties  shall hold and shall each cause their
respective affiliates,  officers, employees, agents, consultants and advisors to
hold,  in strict  confidence  and not to disclose  or release  without the prior
written  consent of the other Party,  any and all  Confidential  Information (as
defined  herein);  provided,  that  the  Parties  may  disclose,  or may  permit
disclosure  of,  Confidential  Information  (i) to  their  respective  auditors,
attorneys,  financial  advisors,  bankers and other appropriate  consultants and
advisors who have a need to know such  information  or (ii) to the extent any of
the  Parties is  compelled  to disclose  any such  Confidential  Information  by
judicial or administrative process or, in the opinion of legal counsel, by other
requirements of Applicable Law.  Notwithstanding the foregoing, if any demand or
request for  disclosure of  Confidential  Information is made pursuant to clause
(ii) above, each of the Parties shall promptly notify the other of the existence
of such request or demand and shall  provide the other a reasonable  opportunity
to seek an appropriate  protective order or other remedy, which the Parties will
cooperate in seeking to obtain.  If such  appropriate  protective order or other
remedy is not obtained, the Party whose Confidential  Information is required to



                                       36


be disclosed  shall  furnish,  or shall cause the other  Parties to furnish,  or
cause to be furnished, only that portion of the Confidential Information that is
legally  required to be disclosed.  As used in this Section 19.6,  "Confidential
Information" means all proprietary,  technical or operational information,  data
or material of one Party that,  prior to or following the Closing Date, has been
disclosed by one Party to another,  in written,  oral  (including by recording),
electronic, or visual form to, or otherwise has come into the possession of, the
other,  including pursuant to the access provisions of this Agreement (except to
the extent that such  Confidential  Information can be shown to have been (a) in
the public domain through no fault of such Party or (b) later lawfully  acquired
from other sources by the Party to which it was furnished; provided, however, in
the case of (b) that,  to the  knowledge  of such  Party,  such  sources did not
provide  such  Confidential   Information  in  breach  of  any   confidentiality
obligations).  "Confidential Information" shall include for Buyer's benefit, all
confidential  information  related to the Buyer Business and the Properties that
Sellers may  transfer  to Buyer  pursuant to this  Agreement  and the  Ancillary
Agreements.  Notwithstanding  anything to the  contrary  set forth  herein,  the
Parties  shall be deemed to have  satisfied  their  obligations  hereunder  with
respect to  Confidential  Information  if they  exercise the same degree of care
(but no less  than a  reasonable  degree  of  care)  as  they  take to  preserve
confidentiality for their own similar information.

     19.7 Cooperation on Legal Matters; Preservation of Legal Privileges.

          19.7.1  The  provisions  of  Exhibit  H  shall  apply  to  any  Claims
("Indemnified  Claims"),  whether presently or hereafter asserted, for which any
Party or Parties  (collectively  the  "Indemnitor")  is  obligated  to indemnify
another Party or Parties  (collectively the  "Indemnitee").  For purposes of the
application of the provisions of Exhibit H to the Indemnified Claims, (a) Claims
as used therein,  shall mean Indemnified Claims as defined in this Section 19.7,
(b)  "Indemnitor"  as used  therein,  shall mean  Indemnitor  as defined in this
Section, (c) "Indemnitee",  as used therein, shall mean Indemnitee as defined in
this Section, (d) "Party  Representative" as used therein shall mean, as to each
Party,  the person  that such  Party  shall  designate  from time to time as its
representative by written notice to the other Parties,  (e) "Effective Date," as
used therein,  shall mean the Closing Date as defined in this  Agreement and (f)
"Law  firm"  shall  mean  the  reputable  attorneys  selected  and  retained  by
Indemnitor to defend the Indemnified  Claims. If a Proceeding is hereafter filed
or  instituted  in  which an  Indemnified  Claim is  asserted  against  a Party,
Indemnitor and Indemnitee  shall, at the request of either,  promptly  execute a
separate Joint Defense Agreement,  which is substantially in the form of Exhibit
H, to memorialize the application of this Section to such Indemnified  Claim and
lawsuit.

          19.7.2 The  Parties  recognize  that the  members of their  respective
groups possess and will possess  information and advice that has been previously
developed but is legally protected from disclosure under federal and state legal
privileges,  such as the attorney-client privilege or work product exemption and
other concepts of legal  protection  ("Privilege").  Each Party  recognizes that
they shall be jointly  entitled to the Privilege with respect to such privileged
information  and that each shall be  entitled  to  maintain  and use for its own
benefit all such information and advice, but both Parties shall ensure that such
information  is maintained so as to protect the  Privileges  with respect to the
other  Party's  interest.  To that end  neither  Party will  knowingly  waive or
compromise any Privilege associated with such information and advice without the
consent  of the  other  Party.  If  privileged  information  is  required  to be
disclosed to any arbitrator or mediator in connection with a dispute between the
Parties,  such disclosure shall not be deemed a waiver of Privilege with respect



                                       37


to such information,  and any Party receiving it in connection with a Proceeding
shall be informed of its nature and shall be required to  safeguard  and protect
it.

                                   ARTICLE 20
                                   ARBITRATION

     The Parties  expressly  agree that,  except as  elsewhere  provided in this
Agreement,  any and all disputes or claims by any Party  arising from or related
to this Agreement that cannot be amicably settled shall be determined solely and
exclusively  by  arbitration  in  accordance  with the CPR Institute for Dispute
Resolution  ("CPR")  Rules for  Non-Administered  Arbitration  ("Rules")  or any
successor thereof when not in conflict with such Rules.

     20.1 Arbitrators,  Timing, Discovery,  Finality of Determination.  Disputes
arising  hereunder that are not resolved  within five (5) Business Days shall be
referred   to  each   Party   Representative   (or   other   designated   senior
representatives  of the  Parties).  If the Party  Representatives  are unable to
solve the dispute  within twenty (20) days after initial  referral,  the dispute
may be submitted by request of either Party to binding arbitration.  Arbitration
shall take place at an appointed time and place in Houston,  Texas.  Calpine and
Sellers (collectively) and Buyer shall each select one impartial arbitrator, and
the two arbitrators so designated shall select a third impartial arbitrator.  If
any Party shall fail to designate an arbitrator  within fourteen (14) days after
arbitration is requested, or if the two arbitrators shall fail to select a third
arbitrator  within  thirty (30) days after  arbitration  is  requested,  then an
arbitrator  shall be selected by CPR.  Judgment upon an award of the majority of
the  arbitrators  shall be binding,  it being  understood  and agreed that in no
event  may the  arbitrators  award  punitive  damages.  Discovery  shall be made
pursuant to the Rules and completed  within one hundred and twenty (120) days of
selection  of the third  arbitrator.  Final  hearing on the matter  shall be had
within  one  hundred  sixty-five  (165)  days  of the  selection  of  the  third
arbitrator and a final decision  (which may include the award of attorney's fees
and costs) with a written opinion stating the reasons therefor shall be rendered
within two hundred  ten (210) days of said date.  Should any time  deadlines  in
Section  20.1  conflict  with those set forth in the  Rules,  the  deadlines  in
Section  20.1  shall take  precedence,  to the  greatest  extent  possible.  The
decision of the arbitrators,  or the majority thereof,  made in writing shall be
final and binding upon the parties hereto as to the questions  submitted,  shall
be  enforceable  against any Party in any court of competent  jurisdiction,  and
Buyer and Sellers will abide by and comply with such  decision.  The expenses of
arbitration,  including  reasonable  compensation to the  arbitrators,  shall be
borne equally by the parties hereto.

     20.2 Confidentiality of Arbitration.  The arbitration process shall be kept
confidential and such conduct, statements,  promises, offers, views and opinions
shall not be  discoverable  or  admissible  in any  Proceeding  for any purpose,
except to the extent  reasonably  necessary to enforce the final decision of the
arbitrators.

                                   ARTICLE 21
                                  MISCELLANEOUS

     21.1 Notice.  All notices  required or permitted under this Agreement shall
be in writing and shall be delivered  personally or by certified  mail,  postage
prepaid and return receipt requested or by telecopier as follows:



                                       38


          Sellers:          Calpine Gas Holdings LLC
                            50 West San Fernando, Suite 500
                            San Jose, California 95113
                            Attention:       John King
                            Telephone:       (408) 794-2608
                            Telecopier:      (408) 294-1740

                            Calpine Fuels Corporation
                            50 West San Fernando, Suite 500
                            San Jose, California 95113
                            Attention:       John King
                            Telephone:       (408) 794-2608
                            Telecopier:      (408) 294-1740

          Calpine:          Calpine Corporation
                            50 West San Fernando, Suite 500
                            San Jose, California 95113
                            Attention:       John King,
                                             Senior Vice President-International
                            Telephone:       (408) 794-2608
                            Telecopier:      (408) 294-1740

          with a copy (which shall not constitute notice) to:

                            Calpine Corporation
                            50 West San Fernando, Suite 500
                            San Jose, California 95113
                            Attention:       Lisa M. Bodensteiner and
                                             Nancy L. Murray
                            Telephone:       (408) 792-1120
                            Telecopier:      (408) 995-0505

                            Calpine Corporation
                            717 Texas, Suite 1000
                            Houston, Texas 77002
                            Attention:       Nanette J. Crawford
                            Telephone:       (713) 830-2085
                            Telecopier:      (713) 830-8751

          Buyer or any of the Subject Companies:

                            Rosetta Resources Inc.
                            717 Texas, Suite 2800
                            Houston, Texas 77002
                            Attention:       B. A. (Bill) Berilgen
                            Telephone:       (713) 335-2400
                            Telecopier:      (713) 651-3056



                                       39


          with a copy (which shall not constitute notice) to:

                            Thompson & Knight LLP
                            333 Clay, Suite 3300
                            Houston, Texas 77002
                            Attention:       Dallas Parker or Timothy T. Samson
                            Telephone:       (713) 951-5800
                            Telecopier:      (832) 397-8110

or to such  other  place  within  the  United  State of  America  as a Party may
designate  for itself as to itself by written  notice to the other.  All notices
given by  personal  delivery  or mail shall be  effective  on the date of actual
receipt  at the  appropriate  address.  Notices  given  by  telecopier  shall be
effective upon actual receipt if received  during  recipient's  normal  business
hours or at the  beginning of the next  Business  Day after  receipt if received
after the recipient's  normal business hours. All notices by telecopier shall be
confirmed  in writing on the day of  transmission  by either  mailing by postage
prepaid certified mail with return receipt requested, or by personal delivery.

     21.2  Governing  Law.  This  Agreement and the  obligations  of the Parties
hereunder  will be governed by and construed in accordance  with the laws of the
State of Texas, without giving effect to any choice of law principles thereof.

     21.3  Assignment.  This Agreement  shall be binding upon and shall inure to
the  benefit  of the  Parties  and their  respective  permitted  successors  and
assigns. Notwithstanding the preceding sentence, neither party shall assign this
Agreement or its rights  hereunder  without the other party's  written  consent,
which shall not be unreasonably withheld.

     21.4  Entire  Agreement.  This  Agreement  and  the  Ancillary  Agreements,
together  with  the  Exhibits  and  Schedules   hereto  and  thereto,   and  the
certificates,  documents,  instruments and writings that are delivered  pursuant
hereto and thereto,  constitutes the entire  agreement and  understanding of the
Parties  in  respect  of  its   subject   matters  and   supersedes   all  prior
understandings,  agreements, or representations by or among the Parties, written
or oral,  to the extent they relate in any way to the subject  matter  hereof or
the  transactions  contemplated  herein.  Except as  contemplated by Article 16,
there are no Third Party  beneficiaries  having  rights under or with respect to
this  Agreement,  except  that any of Buyer's  lenders  may rely upon  Calpine's
representations in Section 5.16.

     21.5   Amendment;   Waiver.   No  amendment,   modification,   replacement,
termination  or  cancellation  of any provision of this Agreement will be valid,
unless the same will be in writing and signed by Buyer,  Sellers and Calpine. No
waiver by any Party of any default,  misrepresentation  or breach of warranty or
covenant  hereunder,  whether intentional or not, may be deemed to extend to any
prior or  subsequent  default,  misrepresentation,  or  breach  of  warranty  or
covenant  hereunder or affect in any way any rights arising because of any prior
or subsequent occurrence.

     21.6  Severability.  The  provisions  of  this  Agreement  will  be  deemed
severable and the  invalidity  or  unenforceability  of any  provision  will not
affect the validity or enforceability of the other provisions hereof;  provided,
however, that if any provision of this Agreement,  as applied to any Party or to



                                       40


any circumstance, is adjudged by a court of competent jurisdiction,  arbitrator,
or mediator not to be  enforceable  in  accordance  with its terms,  the Parties
agree that the court of competent jurisdiction,  arbitrator,  or mediator making
such  determination  will  have the power to modify  the  provision  in a manner
consistent  with its objectives  such that it is  enforceable,  and/or to delete
specific words or phrases,  and in its reduced form, such provision will then be
enforceable and will be enforced.

     21.7 Construction. The Parties have participated jointly in the negotiation
and  drafting  of this  Agreement.  If an  ambiguity  or  question  of intent or
interpretation arises, this Agreement will be construed as if drafted jointly by
the  Parties  and no  presumption  or burden of proof  will  arise  favoring  or
disfavoring  any  Party  because  of the  authorship  of any  provision  of this
Agreement.  Any reference to any  Applicable Law will be deemed also to refer to
such law as amended and all rules and regulations promulgated thereunder, unless
the context requires otherwise.  The words "include," "includes" and "including"
will be deemed to be followed by "without  limitation."  Pronouns in  masculine,
feminine,  and neuter genders will be construed to include any other gender, and
words in the  singular  form will be  construed  to include  the plural and vice
versa,  unless the  context  otherwise  requires.  The words  "this  Agreement,"
"herein,"  "hereof,"  "hereunder"  and  words of  similar  import  refer to this
Agreement as a whole and not to any particular  subdivision  unless expressly so
limited.   The  Exhibits  and  Schedules   identified  in  this   Agreement  are
incorporated  herein by reference and made a part hereof.  References  herein to
any  Section  or  Article  shall be  references  to a Section or Article of this
Agreement unless the context clearly requires otherwise.

     21.8 Headings. The article and section headings contained in this Agreement
are inserted for convenience  only and will not affect in any way the meaning or
interpretation of this Agreement.

     21.9  Counterparts.   This  Agreement  may  be  executed  in  two  or  more
counterparts, each of which will be deemed an original but all of which together
will constitute one and the same instrument.



                  [Remainder of page intentionally left blank]



                                       41





     Executed as of the date set forth above.

                                    SELLERS:

                                    CALPINE GAS HOLDINGS LLC


                                    By:_________________________________________
                                    Name:  John King
                                    Title:______________________________________


                                    CALPINE FUELS CORPORATION


                                    By:_________________________________________
                                    Name:  John King
                                    Title:______________________________________




                                    CALPINE:

                                    CALPINE CORPORATION


                                    By:_________________________________________
                                    Name:  John King
                                    Title:______________________________________




                                    BUYER:

                                    ROSETTA RESOURCES INC.


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer



                                       42



                                    SUBJECT COMPANIES:

                                    ROSETTA RESOURCES CALIFORNIA, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    ROSETTA RESOURCES OFFSHORE, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    ROSETTA RESOURCES ROCKIES, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    ROSETTA RESOURCES TEXAS GP, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    ROSETTA RESOURCES TEXAS LP, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer



                                       43


                                    ROSETTA RESOURCES TEXAS LP

                                    By:   Rosetta Resources Texas GP, LLC, its
                                            general partner


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    CALPINE NATURAL GAS GP, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    CALPINE NATURAL GAS HOLDINGS, LLC


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer


                                    CALPINE NATURAL GAS L.P.

                                    By:   Calpine Natural Gas GP, LLC, its
                                            general partner


                                    By:_________________________________________
                                    Name:  B.A. (Bill) Berilgen
                                    Title: Chairman of the Board, President and
                                             Chief Executive Officer



                                       44




                                    EXHIBIT A

                                SUBJECT COMPANIES



Calpine Natural Gas GP, LLC
Calpine Natural Gas Holdings, LLC
Calpine Natural Gas L.P.
Rosetta Resources California, LLC
Rosetta Resources Offshore, LLC
Rosetta Resources Rockies, LLC
Rosetta Resources Texas GP, LLC
Rosetta Resources Texas LP, LLC
Rosetta Resources Texas LP





EXHIBIT 99.1


NEWS RELEASE
                                                         CONTACTS:  408-995-5115
                                    Media Relations:  Bill Highlander, Ext. 1244
                                    Investor Relations:  Karen Bunton, Ext. 1121


     Calpine Completes Sale of Its Oil and Gas Properties For $1.05 Billion

     (SAN  JOSE,  Calif.)  / PR  Newswire-First  Call / July 7,  2005 -  Calpine
Corporation [NYSE: CPN] announced today that it has completed the sale of all of
its domestic oil and gas  exploration  and production  assets for $1.05 billion,
less approximately $60 million of estimated transaction fees and expenses.  With
the completion of this  transaction,  Calpine  expects to record,  subsequent to
June 30, 2005, a gain on the sale of assets of approximately $350 million.

     The domestic oil and gas  properties  were sold to Rosetta  Resources  Inc.
(Rosetta),  formerly an indirect,  wholly owned  subsidiary of Calpine.  Rosetta
recently  raised $725 million  through the issuance of  45,312,500 of its common
shares. Rosetta used the net proceeds from that transaction,  together with $325
million of proceeds  from a new credit  facility,  to purchase  all of Calpine's
domestic oil and gas  exploration  and  production  assets.  The purchase  price
contemplates  payment in full subject to the  completion of certain post closing
requirements.  With the completion of this  transaction,  Calpine no longer owns
any interest in Rosetta.

     The Rosetta  common shares were offered in a private  placement  under Rule
144A, have not been registered  under the Securities Act of 1933, and may not be
offered  or sold in the  United  States  absent  registration  or an  applicable
exemption from registration  requirements.  This news release is issued pursuant
to Rule 135c under the  Securities Act and shall not constitute an offer to sell
or the  solicitation  of an offer to buy.  Securities laws applicable to private
placements  under Rule 144A limit the extent of information that can be provided
at this time.

     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 the United  Kingdom.
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 www.calpine.com.