Document:

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                                                                   Exhibit 10.21

                                                           EXECUTION COPY

                FIRST AMENDMENT ASSIGNMENT AND SECURITY AGREEMENT

         THIS FIRST AMENDMENT ASSIGNMENT AND SECURITY AGREEMENT (this
"Assignment Agreement"), dated as of July 16, 2003, made by CALPINE CORPORATION,
a Delaware corporation (the "Company"), in favor of THE BANK OF NEW YORK, as
Collateral Trustee (together with any successors thereto in such capacity, the
"Collateral Trustee") for each of the Secured Parties.

                              W I T N E S S E T H:

                  WHEREAS, the Company intends to enter into an Amended and
Restated Credit Agreement dated as of July 16, 2003 (as amended, modified,
renewed, restated or replaced from time to time, the "Credit Agreement") among,
inter alia, the Company, the Lenders referred to therein and The Bank of Nova
Scotia, as Administrative Agent (the "Credit Agreement Agent"), relating to a
$500,000,000 senior secured credit facility to be made available in the form of
revolving loans and term loans, including letters of credit to be issued
thereunder;

                  WHEREAS, the Company intends to (a) issue $500,000,000 in
aggregate principal amount of Second Priority Senior Secured Floating Rate Notes
due 2007 (the "2007 Notes") pursuant to the Indenture dated as of July 16, 2003
(the "2007 Indenture") between the Company and Wilmington Trust Company, as
Trustee (together with its successors in such capacity, the "2007 Trustee"), (b)
issue $1,150,000,000 in aggregate principal amount of 8.50% Second Priority
Senior Secured Notes due 2010 (the "2010 Notes") pursuant to the Indenture dated
as of July 16, 2003 (the "2010 Indenture") between the Company and Wilmington
Trust Company, as Trustee (together with its successors in such capacity, the
"2010 Trustee"), (c) issue $900,000,000 in aggregate principal amount of 8.75%
Second Priority Senior Secured Notes due 2013 (the "2013 Notes") pursuant to the
Indenture dated as of July 16, 2003 (the "2013 Indenture") between the Company
and Wilmington Trust Company, as Trustee (together with its successors in such
capacity, the "2013 Trustee"), and (d) borrow $750,000,000 in Term Loans (the
"Term Loans") pursuant to a Term Loan Agreement dated as of July 16, 2003 (the
"Term Loan Agreement") between the Company and Goldman Sachs Credit Partners
L.P., as Administrative Agent (together with its successors in such capacity,
the "Term Loan Administrative Agent");

                  WHEREAS, the Company intends to secure its Secured
Obligations, including its obligations under the Credit Agreement and any future
Priority Lien Debt, on a priority basis, and, subject to such priority, its
obligations under the 2007 Notes, 2010 Notes, 2013 Notes and Term Loans and any
future Parity Lien Debt equally and ratably, with security interests in, among
other things, all present and future Assigned Collateral (as defined below);

                  WHEREAS, the Company has entered into a Collateral Trust
Agreement dated as of July 16, 2003 (the "Collateral Trust Agreement") among,
inter alia, the Company, the Subsidiaries of the Company named therein and the
Collateral Trustee which sets forth the terms on which the Company has appointed
the Collateral Trustee as trustee for the present and future holders of the
Secured Obligations to receive, hold, maintain, administer, enforce and
distribute

<PAGE>

the Existing Security Documents and all other Security Documents, including this
Assignment Agreement, at any time delivered to the Collateral Trustee and all
interests, rights, powers and remedies of the Collateral Trustee thereunder and
the proceeds thereof;

                  WHEREAS, the Company will derive substantial direct and
indirect benefit from the making of the extensions of credit under each of the
Credit Agreement and the Term Loan Agreement and the offering of each of the
2007 Notes, 2010 Notes and 2013 Notes;

                  WHEREAS, it is a condition precedent to the obligations of the
lenders to make their respective extensions of credit to the Company under each
of the Credit Agreement and the Term Loan Agreement, and condition precedent to
the obligations of the purchasers to purchase each of the 2007 Notes, the 2010
Notes and the 2013 Notes, that the Company shall have executed and delivered
this Assignment Agreement to the Collateral Trustee for the benefit of the
Secured Parties; and

                  WHEREAS, this Assignment Agreement amends and restates in its
entirety the Assignment and Security Agreement dated as of March 8, 2002 made by
the Company in favor of The Bank of Nova Scotia, as agent;

         NOW, THEREFORE, in consideration of the premises contained herein and
for good and valuable consideration the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

         SECTION 1.1.      Certain Terms. The following terms (whether or not
underscored) when used in this Assignment Agreement, including its preamble and
recitals, shall have the following meanings (such definitions to be equally
applicable to the singular and plural forms thereof):

         "Assigned Agreement" is defined in Section 2.1.

         "Assigned Collateral" is defined in Section 2.1.

         "Assignment Agreement" is defined in the preamble.

         "Calpine Gilroy" means Calpine Gilroy Cogen L.P., a Delaware limited
partnership.

         "Collateral Trust Agreement" is defined in the recitals.

         "Collateral Trustee" is defined in the preamble.

         "Company" is defined in the preamble.

         "Secured Parity Lien Parties" means any Person who is holding a Parity
Lien Obligation (including any Parity Debt Representative), at any time.

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         "Secured Priority Lien Parties" means any Person who is holding a
Priority Lien Obligation (including any Priority Lien Agent), at any time.

         "Secured Parties" means any Person who is holding a Secured Obligation
(including any Secured Debt Representative), at any time.

         "U.C.C." means the Uniform Commercial Code, as in effect in the State
of Delaware.

         SECTION 1.2.      Collateral Trust Agreement Definitions. Unless
otherwise defined herein or the context otherwise requires, terms used in this
Assignment Agreement, including its preamble and recitals, have the meanings
provided in the Collateral Trust Agreement.

         SECTION  1.3.     U.C.C. Definitions. Unless otherwise defined herein
or the context otherwise requires, terms for which meanings are provided in the
U.C.C. are used in this Assignment Agreement, including its preamble and
recitals, with such meanings.

                                   ARTICLE II

                                ASSIGNMENT, ETC.

         SECTION 2.1.      Assignment. The Company hereby (i) collaterally
assigns to the Collateral Trustee for its benefit and the benefit of the Secured
Priority Lien Parties, and hereby grants to the Collateral Trustee for its
benefit and the benefit of the Secured Priority Lien Parties a first priority
security interest in, all of the Company's right, title and interest, whether
now existing or hereafter arising or acquired, in and to the following (the
"Assigned Collateral") and (ii) collaterally assigns to the Collateral Trustee
for its benefit and the benefit of the Secured Parity Lien Parties, and hereby
grants to the Collateral Trustee for its benefit and the benefit of the Secured
Parity Lien Parties a second priority security interest in, all of the Assigned
Collateral: Purchase Agreement, between Calpine Corporation and Calpine Gilroy
Cogen L.P., a Delaware limited partnership, dated as of March 8, 2002, as it may
be amended or otherwise modified from time to time (as so amended or modified,
the "Assigned Agreement"), including, without limitation,

                  (a)      all rights of the Company to receive moneys due and
         to become due under or pursuant to the Assigned Agreement,

                  (b)      all rights of the Company to receive proceeds of any
         insurance, indemnity, warranty, guaranty or collateral security with
         respect to the Assigned Agreement,

                  (c)      all claims of the Company for damages arising out of
         or for breach of or default under the Assigned Agreement,

                  (d)      the right of the Company to terminate the Assigned
         Agreement, to perform thereunder and to compel performance and
         otherwise exercise all remedies thereunder, and

                  (e)      to the extent not included in the foregoing, all
         proceeds of any and all of the foregoing collateral.

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         SECTION 2.2.      Security for Obligations; Separate Liens. This
Assignment Agreement and the security interests and Liens granted and created
herein secures the payment and performance of all Secured Obligations of the
Company now or hereafter, whether direct or indirect, absolute or contingent,
and whether for principal, reimbursement obligations, interest (including any
interest accruing at the then applicable rate provided in any applicable Secured
Debt Document after the maturity of the loans and reimbursement obligations
therein and interest accruing at the then applicable rate provided in any
applicable Secured Debt Document after the filing of any petition in bankruptcy,
or the commencement of any insolvency, reorganization or like proceeding,
relating to the Company, whether or not a claim for post-filing or post-petition
interest is allowed in such proceeding), fees, premiums, penalties,
indemnifications, expenses or otherwise, and including all amounts that
constitute part of the Secured Obligations and would be owed by the Company but
for the fact that they are unenforceable or not allowed due to a pending
Bankruptcy Case or Insolvency Proceeding. Without limiting the generality of the
foregoing, it is the intent of the parties that (i) the Liens securing the
Parity Lien Obligations are subject and subordinate to the Liens securing the
Priority Lien Obligations up to the Priority Lien Cap and (ii) this Assignment
Agreement creates two separate and distinct Liens: the first Lien securing the
payment and performance of the Priority Lien Obligations and the second Lien
securing the payment and performance of the Parity Lien Obligations.

         SECTION  2.3.     Continuing Assignment and Security Interest;
Transfer of Notes. This Assignment Agreement shall create a continuing security
interest in the Assigned Collateral and, subject to Section 4.1 of the
Collateral Trust Agreement and the other Secured Debt Documents, shall

                  (a)      remain in full force and effect until payment in full
         of all Secured Obligations and the termination or expiration of all
         commitments to extend credit under all Credit Facilities, the
         Indebtedness under which constitutes Priority Lien Debt,

                  (b)      be binding upon the Company, its successors,
         transferees and assigns, and

                  (c)      inure, together with the rights and remedies of the
         Collateral Trustee hereunder, to the benefit of the Collateral Trustee
         and each other Secured Party.

Without limiting the foregoing clause (c), any Secured Party may assign or
otherwise transfer (in whole or in part) any right or obligation under the
Secured Debt Documents to any other Person or entity, and such other Person or
entity shall thereupon become vested with all the rights and benefits in respect
thereof granted to such Secured Party under any Secured Debt Document (including
this Assignment Agreement) or otherwise, subject, however, to any contrary
provisions in such assignment or transfer, and to the applicable provisions of
each of the Secured Debt Documents. Upon the payment in full and discharge of
all Secured Obligations that are then outstanding, due and payable and the
termination or expiration of all commitments to extend credit under all Credit
Facilities, the Indebtedness under which constitutes Priority Lien Debt, the
security interest granted herein shall terminate and all rights to the Assigned
Collateral shall revert to the Company. Upon any such termination or any release
of the Lien provided for hereunder in accordance with the Secured Debt
Documents, the Collateral Trustee will, at the

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Company's sole expense, execute and deliver to the Company such documents as the
Company shall reasonably request to evidence such termination or release.

         SECTION  2.4.     Company Remains Liable. Anything herein to the
contrary notwithstanding

                  (a)      the Company shall remain liable under the contracts
         and agreements included in the Assigned Collateral to the extent set
         forth therein, and shall perform all of its duties and obligations
         under such contracts and agreements to the same extent as if this
         Assignment Agreement had not been executed,

                  (b)      the exercise by the Collateral Trustee of any of its
         rights hereunder shall not release the Company from any of its duties
         or obligations under any such contracts or agreements included in the
         Assigned Collateral, and

                  (c)      neither the Collateral Trustee nor any other Secured
         Party shall have any obligation or liability under any such contracts
         or agreements included in the Assigned Collateral by reason of this
         Assignment Agreement or by the exercise by the Collateral Trustee of
         its rights hereunder or under any other Secured Debt Document, nor
         shall the Collateral Trustee or any other Secured Party be obligated to
         perform any of the obligations or duties of the Company thereunder or
         to take any action to collect or enforce any claim for payment assigned
         hereunder.

                                  ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         SECTION  3.1.     Representations and Warranties. The Company
represents and warrants unto the Collateral Trustee and each Secured Party as
set forth in this Article.

         SECTION 3.1.1.    Due Authorization, Non-Contravention, etc. The
execution, delivery and performance by the Company of this Assignment Agreement,
is within the Company's powers, has been duly authorized by all necessary
corporate action, and does not

                  (a)      contravene the Company's certificate of incorporation
         or bylaws;

                  (b)      contravene any contractual restriction (including,
         without limitation, the Assigned Agreement), law or governmental
         regulation or court decree or order binding on or affecting the
         Company; or

                  (c)      except for the Lien created hereunder, result in, or
         require the creation or imposition of, any Lien on any of the Company's
         properties.

         SECTION 3.1.2.    Validity of Assigned Agreement. The Assigned
Agreement, a true and complete copy of which has been furnished to the
Collateral Trustee, has been duly authorized, executed and delivered by the
parties thereto, has not been amended or otherwise modified and is in full force
and effect and is binding upon and enforceable against the parties thereto in
accordance with its terms. The Company has fully performed all of its
obligations under the

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Assigned Agreement and, to the best of the Company's knowledge, Calpine Gilroy
has no defense, setoff or counterclaim arising under the Assigned Agreement.
There exists no default under the Assigned Agreement by the Company and, to the
best of the Company's knowledge, by Calpine Gilroy.

         SECTION 3.1.3.    Location of Assigned Collateral, etc. The place of
business and chief executive office of the Company and the office where the
Company keeps its records concerning the Assigned Collateral is the address
specified for the Company on the signature page hereto. The Company has no trade
name. The Company has not been known by any legal name different from the one
set forth on the signature page hereto, nor has the Company been the subject of
any merger or other corporate reorganization. None of the Assigned Collateral is
evidenced by a promissory note or other instrument.

         SECTION 3.1.4.   Ownership, No Liens, etc. The Company owns the
Assigned Collateral free and clear of any Lien, security interest, charge or
encumbrance except for the security interest created by this Assignment
Agreement. No effective financing statement or other instrument similar in
effect covering all or any part of the Assigned Collateral is on file in any
recording office, except such as may have been filed in favor of the Collateral
Trustee relating to this Assignment Agreement.

         SECTION 3.1.5.    Validity, etc. This Assignment Agreement creates a
valid and, upon filing of a proper financing statement with the Delaware
Secretary of State, first priority or second priority, as the case may be,
security interest in the Assigned Collateral, securing the payment of the
Secured Obligations, subject in each case to the provisions of Section 3.4 of
the Collateral Trust Agreement, and, upon the filing of such financing
statement, all filings and other actions necessary or desirable to perfect and
protect such security interest will have been duly taken.

         SECTION 3.1.6.    Authorization, Approval, etc. No authorization,
approval or other action by, and no notice to or filing with, any governmental
authority or regulatory body is required either

                  (a)      for the grant by the Company of the security interest
         granted hereby or for the execution, delivery and performance of this
         Assignment Agreement by the Company, or

                  (b)      for the perfection of or the exercise by the
         Collateral Trustee of its rights and remedies hereunder.

         SECTION 3.1.7.    Compliance with Laws. The Company is in compliance
with the requirements of all applicable laws, rules, regulations and orders of
every governmental authority, the non-compliance with which might materially
adversely affect the business, properties, assets, operations, condition
(financial or otherwise) or prospects of the Company or the value of the
Assigned Collateral or the worth of the Assigned Collateral as collateral
security.

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                                   ARTICLE IV

                                    COVENANTS

         SECTION 4.1.      Certain Covenants. The Company covenants and agrees
that, so long as any portion of the Secured Obligations shall remain unpaid or
any commitment to extend credit under any Credit Facilities, the Indebtedness
under which constitutes Priority Lien Debt shall have not been permanently
terminated or expired, the Company will, perform the obligations set forth in
this Section.

         SECTION 4.1.1.    As to Assigned Agreement. The Company, at its
expense, shall or shall cause Calpine Gilroy, as applicable, to:

                  (a)      perform and observe all the terms and provisions of
         the Assigned Agreement to be performed or observed by Company or
         Calpine Gilroy, maintain the Assigned Agreement in full force and
         effect, enforce the Assigned Agreement in accordance with its terms,
         and take all such necessary action to such end; and

                  (b)      furnish to the Collateral Trustee promptly upon
         receipt thereof copies of all material notices, requests and other
         documents received by the Company or Calpine Gilroy under or pursuant
         to the Assigned Agreement, and from time to time (i) furnish to the
         Collateral Trustee such information and reports regarding the Assigned
         Collateral as the Collateral Trustee or any Secured Debt Representative
         may reasonably request and (ii) upon request of the Collateral Trustee
         or any Secured Debt Representative make to Calpine Gilroy such demands
         and requests for information and reports or for action as the Company
         is entitled to make under the Assigned Agreement.

         SECTION 4.1.2.    [Intentionally Omitted.].

         SECTION 4.1.3.    Further Assurances, etc. The Company agrees that,
from time to time, at the expense of the Company, the Company will and will
cause Calpine Gilroy to promptly execute and deliver all further instruments and
documents, and take all further action, that may be necessary or desirable, or
that the Collateral Trustee or any Secured Debt Representative may reasonably
request, in order to perfect, preserve and protect any security interest granted
or purported to be granted hereby or to enable the Collateral Trustee to
exercise and enforce its rights and remedies hereunder with respect to any
Assigned Collateral. Without limiting the generality of the foregoing, the
Company will and will cause Calpine Gilroy to

                  (a)      if any Assigned Collateral shall become evidenced by
         a promissory note or other instrument, negotiable document or chattel
         paper, deliver and pledge to the Collateral Trustee hereunder such
         promissory note or instrument, negotiable document or chattel paper
         duly indorsed and accompanied by duly executed instruments of transfer
         or assignment, all in form and substance reasonably satisfactory to the
         Collateral Trustee; and

                  (b)      execute and file such financing or continuation
         statements, or amendments thereto, and such other instruments or
         notices, as may be necessary or desirable, or as the Collateral Trustee
         or any Secured Debt Representative may reasonably request, in order

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         to perfect and preserve the security interests and other rights granted
         or purported to be granted to the Collateral Trustee hereby.

With respect to the foregoing and the grant of the security interest hereunder,
the Company hereby authorizes the Collateral Trustee to file one or more
financing or continuation statements, and amendments thereto, relative to all or
any part of the Assigned Collateral without the signature of the Company where
permitted by law. A carbon, photographic or other reproduction of this
Assignment Agreement or any financing statement covering the Assigned Collateral
or any part thereof shall be sufficient as a financing statement where permitted
by law.

         SECTION 4.1.4.    State of Incorporation. The Company agrees to give
the Collateral Trustee and each Secured Debt Representative prior written notice
of any change in its state of incorporation in the state of Delaware. The
Company agrees promptly to provide the Collateral Trustee and each Secured Debt
Representative with certified organizational documents reflecting any change to
such state of incorporation.

                                    ARTICLE V

                             THE COLLATERAL TRUSTEE

         SECTION 5.1.      Collateral Trustee Appointed Attorney-in-Fact.
Company hereby irrevocably appoints the Collateral Trustee the Company's
attorney-in-fact, with full authority in the place and stead of the Company and
in the name of the Company or otherwise, from time to time in the Collateral
Trustee's discretion, but only after the occurrence and during the continuance
of an Actionable Default, to take any action (including any action under the
Assigned Agreement that the Company is entitled to take) and to execute any
instrument which the Collateral Trustee may deem necessary or advisable to
accomplish the purposes of this Assignment Agreement, including, without
limitation:

                  (a)      to ask, demand, collect, sue for, recover,
         compromise, receive and give acquittance and receipts for moneys due
         and to become due under or in respect of any of the Assigned
         Collateral;

                  (b)      to receive, endorse, and collect any drafts or other
         instruments, documents and chattel paper, in connection with clause (a)
         above;

                  (c)      to file any claims or take any action or institute
         any proceedings which the Collateral Trustee may deem necessary or
         desirable for the collection thereof or to enforce compliance with the
         terms and conditions of the Assigned Agreement; and

                  (d)      to perform the affirmative obligations of the Company
         hereunder (including all obligations of the Company pursuant to Section
         4.1.1 and Section 4.1.3).

The Company hereby acknowledges, consents and agrees that the power of attorney
granted pursuant to this Section is irrevocable and coupled with an interest.

         SECTION 5.2.      Collateral Trustee May Perform. If the Company fails
to perform any agreement contained herein, the Collateral Trustee may itself
perform, or cause performance of,

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such agreement, and the expenses of the Collateral Trustee incurred in
connection therewith shall be payable by the Company pursuant to Section 6.2.

         SECTION 5.3       Collateral Trustee's Rights and Duties Subject to
Collateral Trust Agreement. Notwithstanding anything to the contrary contained
in this Assignment Agreement, in acting under and by virtue of this Assignment
Agreement, the Collateral Trustee shall be entitled to all of the rights,
privileges and immunities provided to it in the Collateral Trust Agreement, and
the rights and duties of the Collateral Trustee hereunder are subject in all
respects to the terms, conditions and limitations set forth in the Collateral
Trust Agreement (including, without limitation, the provisions of Article 5
thereof), reference to which is made for all purposes; provided, however, that
any forbearance by the Collateral Trustee in exercising any right or remedy
available to it under the Collateral Trust Agreement shall not give rise to a
defense on the part of the Company with respect to the Collateral Trustee's
exercise of any right or remedy pursuant to this Assignment Agreement or as
otherwise afforded by applicable law.

                                   ARTICLE VI

                                    REMEDIES

         SECTION  6.1.     Certain Remedies. If an Actionable Default shall have
occurred and be continuing:

                  (a)      The Collateral Trustee may exercise in respect of the
         Assigned Collateral, in addition to other rights and remedies provided
         for herein or otherwise available to it, all the rights and remedies of
         a secured party on default under the U.C.C. (whether or not the U.C.C.
         applies to the affected Assigned Collateral) and also may exercise any
         and all rights and remedies of the Company under or in connection with
         the Assigned Agreement or otherwise in respect of the Assigned
         Collateral, including, without limitation, any and all rights of the
         Company to demand or otherwise require payment of any amount under, or
         performance of any provision of, the Assigned Agreement, in each case
         subject to the terms and provisions of the Collateral Trust Agreement;

                  (b)      all payments received by the Company under or in
         connection with the Assigned Agreement or otherwise in respect of the
         Assigned Collateral shall be received in trust for the benefit of the
         Collateral Trustee, shall be segregated from other funds of the Company
         and shall be forthwith paid over to the Collateral Trustee in the same
         form as so received (with any necessary indorsement); and

                  (c)      all payments made under or in connection with the
         Assigned Agreement or otherwise in respect of the Assigned Collateral
         and received by the Collateral Trustee may, in the discretion of the
         Collateral Trustee, be held by the Collateral Trustee as collateral
         for, and/or then or at any time thereafter applied in whole or in part
         by the Collateral Trustee in accordance with Section 3.4 of the
         Collateral Trust Agreement.

         SECTION  6.2.     Indemnity and Expenses.

                  (a)      The Company agrees to indemnify the Collateral
         Trustee from and against any and all Indemnified Liabilities with
         respect to the execution, delivery, performance,

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         administration or enforcement of this Assignment Agreement to the
         extent provided in Section 7.8 of the Collateral Trust Agreement.

                  (b)      The Company agrees to reimburse the Collateral
         Trustee for all costs, fees and expenses relating to this Assignment
         Agreement to the extent provided in Section 7.7 of the Collateral Trust
         Agreement.

                                   ARTICLE VII

                            MISCELLANEOUS PROVISIONS

         SECTION 7.1.      Security Document. This Assignment Agreement is a
Security Document executed pursuant to the Collateral Trust Agreement and shall
(unless otherwise expressly indicated herein) be construed, administered and
applied in accordance with the terms and provisions thereof.

         SECTION 7.2.      Amendments; etc. No amendment to or waiver of any
provision of this Assignment Agreement nor consent to any departure by the
Company herefrom, shall in any event be effective unless the same shall be in
writing and signed by the Collateral Trustee in accordance with Section 7.1 of
the Collateral Trust Agreement, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
given.

         SECTION 7.3.      Addresses for Notices. All notices and other
communications provided for hereunder shall be in writing (including telegraphic
communication) and shall be effected in the manner provided for in Section 7.5
of the Collateral Trust Agreement.

         SECTION  7.4.     Section Captions. Section captions used in this
Assignment Agreement are for convenience of reference only, and shall not affect
the construction of this Assignment Agreement.

         SECTION 7.5.      Severability. Wherever possible each provision of
this Assignment Agreement shall be interpreted in such manner as to be effective
and valid under applicable law, but if any provision of this Assignment
Agreement shall be prohibited by or invalid under such law, such provision shall
be ineffective to the extent of such prohibition or invalidity, without
invalidating the remainder of such provision or the remaining provisions of this
Assignment Agreement.

         SECTION 7.6.      Governing Law, Entire Agreement, etc. THIS ASSIGNMENT
AGREEMENT SHALL BE DEEMED TO BE A CONTRACT MADE UNDER AND GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK. This
Assignment Agreement constitutes the entire understanding among the parties
hereto with respect to the subject matter hereof and supersede any prior
agreements, written or oral, with respect thereto.

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<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Assignment Agreement to
be duly executed and delivered by its officer thereunto duly authorized as of
the date first above written.

                                        CALPINE CORPORATION,
                                         a Delaware corporation

                                        By: /s/ Michael Thomas
                                           -------------------------------------
                                        Name: Michael Thomas
                                        Title:

                                        Address: 50 West San Fernando Street
                                                 San Jose, CA 95113

                                        Attention: Treasurer

                                        Telecopier: (408) 995-0505

                                       11
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                                        THE BANK OF NEW YORK, NOT IN ITS
                                        INDIVIDUAL CAPACITY, BUT SOLELY AS
                                        COLLATERAL TRUSTEE

                                        By: /s/ Michael Pitfick
                                           -------------------------------------
                                        Name: Michael Pitfick
                                        Title: Assistant Vice President

                                       12<PAGE>

                                                                   Exhibit 10.22

                                                EXECUTION COPY
                                                Calpine Corporation Stock Pledge

                        SECOND AMENDMENT PLEDGE AGREEMENT

         THIS SECOND AMENDMENT PLEDGE AGREEMENT (this "Pledge Agreement"), dated
as of July 16, 2003, made by Calpine Corporation, a Delaware corporation (the
"Company"), in favor of The Bank of New York, as Collateral Trustee (together
with any successor(s) thereto in such capacity, the "Collateral Trustee") for
the benefit of the Secured Parties.

                               W I T N E S S E T H

                  WHEREAS, the Company intends to enter into an Amended and
Restated Credit Agreement dated as of July 16, 2003 (as amended, modified,
renewed, restated or replaced from time to time, the "Credit Agreement") among,
inter alia, the Company, the Lenders referred to therein and The Bank of Nova
Scotia, as Administrative Agent (the "Credit Agreement Agent"), relating to a
$500,000,000 senior secured credit facility to be made available in the form of
revolving loans and term loans, including letters of credit to be issued
thereunder;

                  WHEREAS, the Company intends to (a) issue $500,000,000 in
aggregate principal amount of Second Priority Senior Secured Floating Rate Notes
due 2007 (the "2007 Notes") pursuant to the Indenture dated as of July 16, 2003
(the "2007 Indenture") between the Company and Wilmington Trust Company, as
Trustee (together with its successors in such capacity, the "2007 Trustee"), (b)
issue $1,150,000,000 in aggregate principal amount of 8.50% Second Priority
Senior Secured Notes due 2010 (the "2010 Notes") pursuant to the Indenture dated
as of July 16, 2003 (the "2010 Indenture") between the Company and Wilmington
Trust Company, as Trustee (together with its successors in such capacity, the
"2010 Trustee"), (c) issue $900,000,000 in aggregate principal amount of 8.75%
Second Priority Senior Secured Notes due 2013 (the "2013 Notes") pursuant to the
Indenture dated as of July 16, 2003 (the "2013 Indenture") between the Company
and Wilmington Trust Company, as Trustee (together with its successors in such
capacity, the "2013 Trustee"), and (d) borrow $750,000,000 in Term Loans (the
"Term Loans") pursuant to a Term Loan Agreement dated as of July 16, 2003 (the
"Term Loan Agreement") between the Company and Goldman Sachs Credit Partners
L.P., as Administrative Agent (together with its successors in such capacity,
the "Term Loan Administrative Agent");

                  WHEREAS, the Company intends to secure its Secured
Obligations, including its obligations under the Credit Agreement and any future
Priority Lien Debt, on a priority basis, and, subject to such priority, its
obligations under the 2007 Notes, 2010 Notes, 2013 Notes and Term Loans and any
future Parity Lien Debt equally and ratably, with security interests in, and
pledge of, among other things, all present and future Pledged Collateral (as
defined below);

                  WHEREAS, the Company has entered into a Collateral Trust
Agreement dated as of July 16, 2003 (the "Collateral Trust Agreement") among,
inter alia, the Company, the Subsidiaries of the Company named therein and the
Collateral Trustee which sets forth the terms on which the Company has appointed
the Collateral Trustee as trustee for the present and future

<PAGE>

holders of the Secured Obligations to receive, hold, maintain, administer,
enforce and distribute the Existing Security Documents and all other Security
Documents, including this Pledge Agreement, at any time delivered to the
Collateral Trustee and all interests, rights, powers and remedies of the
Collateral Trustee thereunder and the proceeds thereof;

                  WHEREAS, the Company will derive substantial direct and
indirect benefit from the making of the extensions of credit under each of the
Credit Agreement and the Term Loan Agreement and the offering of each of the
2007 Notes, 2010 Notes and 2013 Notes;

                  WHEREAS, it is a condition precedent to the obligation of the
lenders to make their respective extensions of credit to the Company under each
of the Credit Agreement and the Term Loan Agreement, and condition precedent to
the obligation of the purchasers to purchase each of the 2007 Notes, the 2010
Notes and the 2013 Notes, that the Company shall have executed and delivered
this Pledge Agreement to the Collateral Trustee for the benefit of the Secured
Parties; and

                  WHEREAS, this Pledge Agreement amends and restates in its
entirety the First Amendment Pledge Agreement dated as of May 9, 2002 made by
the Company in favor of The Bank of Nova Scotia, as agent;

         NOW, THEREFORE, in consideration of the premises contained herein and
for good and valuable consideration the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

         SECTION 1.1.      Certain Terms. The following terms (whether or not
underscored) when used in this Pledge Agreement, including its preamble and
recitals, shall have the following meanings (such definitions to be equally
applicable to the singular and plural forms thereof):

         "Collateral Trustee" is defined in the preamble.

         "Collateral Trust Agreement" is defined in the recitals.

         "Company" is defined in the preamble.

         "Distributions" means all stock dividends, liquidating dividends,
shares of stock resulting from (or in connection with the exercise of) stock
splits, reclassifications, warrants, options, non-cash dividends, mergers,
consolidations, and all other distributions (whether similar or dissimilar to
the foregoing) on or with respect to any Pledged Shares or other shares of
capital stock constituting Pledged Collateral, but shall not include Dividends.

         "Dividends" means cash dividends and cash distributions with respect to
any Pledged Shares or other Pledged Property made in the ordinary course of
business and not a liquidating dividend.

         "Pledge Agreement" is defined in the preamble.

                                       2
<PAGE>

         "Pledged Collateral" is defined in Section 2.1.

         "Pledged Property" means all Pledged Shares and all other pledged
shares of capital stock, all other securities, all assignments of any amounts
due or to become due, all other instruments which are now being delivered by the
Company to the Collateral Trustee or may from time to time hereafter be
delivered by the Company to the Collateral Trustee for the purpose of pledge
under this Pledge Agreement or any other Secured Debt Document, and all proceeds
of any of the foregoing.

         "Pledged Share Issuer" means each Person identified in Attachment 1
hereto as the issuer of the Pledged Shares identified opposite the name of such
Person, and each Person that is the issuer of any shares of capital stock that
are obtained by the Company in the future and pledged hereunder.

         "Pledged Shares" means all shares of capital stock of any Pledged Share
Issuer which are owned by the Company on the date hereof or obtained by the
Company in the future and in each case delivered by the Company to the
Collateral Trustee as Pledged Property hereunder.

         "Secured Parity Lien Parties" means any Person who is holding a Parity
Lien Obligation (including any Parity Debt Representative), at any time.

         "Secured Parties" means any Person who is holding a Secured Obligation
(including any Secured Debt Representative), at any time.

         "Secured Priority Lien Parties" means any Person who is holding a
Priority Lien Obligation (including any Priority Lien Agent), at any time.

         "Securities Act" is defined in Section 6.2.

         "U.C.C." means the Uniform Commercial Code as in effect in the State of
New York.

         SECTION 1.2.      Definitions. Unless otherwise defined herein or the
context otherwise requires, terms used in this Pledge Agreement, including its
preamble and recitals, have the meanings provided in the Collateral Trust
Agreement.

         SECTION 1.3.      U.C.C. Definitions. Unless otherwise defined herein
or the context otherwise requires, terms for which meanings are provided in the
U.C.C. are used in this Pledge Agreement, including its preamble and recitals,
with such meanings.

                                   ARTICLE II
                                     PLEDGE

         SECTION 2.1.      Grant of Security Interest. The Company hereby (i)
pledges, hypothecates, assigns, charges, mortgages, delivers and transfers to
the Collateral Trustee, for its benefit and the benefit of the Secured Priority
Lien Parties, and hereby grants to the Collateral Trustee, for its benefit and
the benefit of the Secured Priority Lien Parties, a continuing first priority
security interest in, all of the following property (the "Pledged Collateral")
and (ii) pledges, hypothecates, assigns, charges, mortgages, delivers and
transfers to the Collateral

                                       3
<PAGE>

Trustee, for its benefit and the benefit of the Secured Parity Lien Parties, and
hereby grants to the Collateral Trustee, for its benefit and the benefit of the
Secured Parity Lien Parties, a continuing second priority security interest in,
all of the Pledged Collateral:

                  (a)      all issued and outstanding shares of capital stock of
         each Pledged Share Issuer identified in Attachment 1 hereto;

                  (b)      and the certificates representing the Pledged Shares
         and all dividends, cash, instruments and other property from time to
         time received, receivable or otherwise distributed in respect of or in
         exchange for any or all of the Pledged Shares;

                  (c)      all additional shares of stock of any issuer of the
         Pledged Shares from time to time acquired by the Company in any manner,
         and the certificates representing such additional shares, and all
         dividends, cash, instruments and other property from time to time
         received, receivable or otherwise distributed in respect of or in
         exchange for any or all of such shares;

                  (d)      all other Pledged Shares issued from time to time;

                  (e)      all other Pledged Property, whether now or hereafter
         delivered to the Collateral Trustee in connection with this Pledge
         Agreement;

                  (f)      all Dividends, Distributions, interest, and other
         payments and rights with respect to any Pledged Property; and

                  (g)      all proceeds of any of the foregoing.

         SECTION 2.2.      Security for Obligations; Separate Liens. This Pledge
Agreement and the security interests and Liens granted and created herein
secures the payment an performance of all Secured Obligations of the Company now
or hereafter, whether direct or indirect, absolute or contingent, and whether
for principal, reimbursement obligations, interest (including any interest
accruing at the then applicable rate provided in any applicable Secured Debt
Document after the maturity of the loans and reimbursement obligations therein
and interest accruing at the then applicable rate provided in any applicable
Secured Debt Document after the filing of any petition in bankruptcy, or the
commencement of any insolvency, reorganization or like proceeding, relating to
the Company, whether or not a claim for post-filing or post-petition interest is
allowed in such proceeding), fees, premiums, penalties, indemnifications,
expenses or otherwise, and including all amounts that constitute part of the
Secured Obligations and would be owed by the Company but for the fact that they
are unenforceable or not allowed due to a pending Bankruptcy Case or Insolvency
Proceeding. Without limiting the generality of the foregoing, it is the intent
of the parties that (i) the Liens securing the Parity Lien Obligations are
subject and subordinate to the Liens securing the Priority Lien Obligations up
to the Priority Lien Cap and (ii) this Pledge Agreement creates two separate and
distinct Liens: the first Lien securing the payment and performance of the
Priority Lien Obligations and the second Lien securing the payment and
performance of the Parity Lien Obligations.

         SECTION 2.3.      Delivery of Pledged Property. All certificates or
instruments representing or evidencing any Pledged Collateral, including all
Pledged Shares, shall be

                                       4
<PAGE>

delivered to and held by or on behalf of the Collateral Trustee pursuant hereto,
shall be in suitable form for transfer by delivery, and shall be accompanied by
all necessary instruments of transfer or assignment, duly executed in blank.

         SECTION 2.4.      Intentionally Omitted.

         SECTION 2.5.      Continuing Security Interest; Transfer of Note. This
Pledge Agreement shall create a continuing security interest in the Pledged
Collateral and, subject to Section 4.1 of the Collateral Trust Agreement and the
other Secured Debt Documents, shall

                  (a)      remain in full force and effect until payment in full
         of all Secured Obligations and the termination or expiration of all
         commitments to extend credit under all Credit Facilities the
         Indebtedness under which constitutes Priority Lien Debt,

                  (b)      be binding upon the Company and its successors,
         transferees and assigns, and

                  (c)      inure, together with the rights and remedies of the
         Collateral Trustee hereunder, to the benefit of the Collateral Trustee
         and each other Secured Party.

Without limiting the foregoing clause (c), any Secured Party may assign or
otherwise transfer (in whole or in part) any right or obligation under the
Secured Debt Documents to any other Person or entity, and such other Person or
entity shall thereupon become vested with all the rights and benefits in respect
thereof granted to such Secured Party under any Secured Debt Document (including
this Pledge Agreement) or otherwise, subject, however, to any contrary
provisions in such assignment or transfer, and to the applicable provisions of
each of the Secured Debt Documents. Upon the payment in full and discharge of
all Secured Obligations that are then outstanding, due and payable and the
termination or expiration of all commitments to extend credit under all Credit
Facilities the Indebtedness under which constitutes Priority Lien Debt, the
security interest granted herein shall terminate and all rights to the Pledged
Collateral shall revert to the Company. Upon any such termination or release of
the Lien provided for hereunder in accordance with the Secured Debt Documents,
the Collateral Trustee will, at the Company's sole expense, deliver to the
Company, without any representations, warranties or recourse of any kind
whatsoever, all certificates and instruments representing or evidencing all
Pledged Shares, together with all other Pledged Collateral held by the
Collateral Trustee hereunder, and execute and deliver to the Company such
documents as the Company shall reasonably request to evidence such termination
or release.

         SECTION 2.6.      Security Interest Absolute. All rights of the
Collateral Trustee and the security interests granted to the Collateral Trustee
hereunder, and all obligations of the Company hereunder, shall be absolute and
unconditional, irrespective of

                  (a)      any lack of validity or enforceability of any of the
         Secured Debt Documents,

                  (b)      the failure of any Secured Party or any holder of any
         Secured Obligation

                                       5
<PAGE>

                           (i)      to assert any claim or demand or to enforce
                  any right or remedy against the Company, any other Obligor or
                  any other Person under the provisions of any of the Secured
                  Debt Documents or otherwise, or

                           (ii)     to exercise any right or remedy against any
                  other guarantor of, or collateral securing, any Secured
                  Obligations of the Company or any other Obligor,

                  (c)      any change in the time, manner or place of payment
         of, or in any other term of, all or any of the Secured Obligations or
         any other extension, compromise or renewal of any Secured Obligation of
         the Company or any other Obligor,

                  (d)      any reduction, limitation, impairment or termination
         of any Secured Obligations of the Company or any other Obligor for any
         reason, including any claim of waiver, release, surrender, alteration
         or compromise, and shall not be subject to (and the Company hereby
         waives any right to or claim of) any defense or setoff, counterclaim,
         recoupment or termination whatsoever by reason of the invalidity,
         illegality, nongenuineness, irregularity, compromise, unenforceability
         of, or any other event or occurrence affecting, any Secured Obligations
         of the Company, any other Obligor or otherwise,

                  (e)      any amendment to, rescission, waiver, or other
         modification of, or any consent to departure from, any of the terms of
         any of the Secured Debt Documents,

                  (f)      any addition, exchange, release, surrender or
         non-perfection of any collateral (including the Pledged Collateral), or
         any amendment to or waiver or release of or addition to or consent to
         departure from any guaranty, for any of the Secured Obligations, or

                  (g)      any other circumstances which might otherwise
         constitute a defense available to, or a legal or equitable discharge
         of, the Company, any other Obligor, any surety or any guarantor.

         SECTION 2.7.      [Intentionally Omitted.]

         SECTION 2.8.      Waiver of Subrogation. Until such time as the Secured
Obligations have been paid in full and discharged and all commitments to extend
credit under all Credit Facilities the Indebtedness under which constitutes
Priority Lien Debt shall have been permanently terminated or expired, the
Company hereby irrevocably waives any claim or other rights which it may now or
hereafter acquire against the Company or any other Obligor that arise from the
existence, payment, performance or enforcement of the Company's obligations
under this Pledge Agreement or any other Secured Debt Document, including any
right of subrogation, reimbursement, exoneration, or indemnification, any right
to participate in any claim or remedy of the Collateral Trustee against the
Company or any other Obligor or any collateral which the Collateral Trustee now
has or hereafter acquires, whether or not such claim, remedy or right arises in
equity, or under contract, statute or common law, including the right to take or
receive from the Company or any other Obligor, directly or indirectly, in cash
or other property or by set-off or in any manner, payment or security on account
of such claim or other rights. If any

                                       6
<PAGE>

amount shall be paid to the Company in violation of the preceding sentence and
the Secured Obligations shall not have been indefeasibly paid in full, in cash,
and all commitments to extend credit under all Credit Facilities the
Indebtedness under which constitutes Priority Lien Debt shall have not been
permanently terminated or expired, such amount shall be deemed to have been paid
to the Company for the benefit of, and held in trust for, the Collateral
Trustee, and shall forthwith be paid to the Collateral Trustee to be credited
and applied upon the Secured Obligations, whether matured or unmatured, in
accordance with the terms of the Collateral Trust Agreement. The Company
acknowledges that it will receive direct and indirect benefits from the
financing arrangements contemplated by the Secured Debt Documents and that the
waiver set forth in this Section is knowingly made in contemplation of such
benefits.

                                   ARTICLE III
                         REPRESENTATIONS AND WARRANTIES

         SECTION 3.1.      Warranties, etc. The Company represents and warrants
unto the Collateral Trustee and each Secured Party, as at the date of each
pledge and delivery hereunder (including each pledge and delivery of Pledged
Shares) by the Company to the Collateral Trustee of any Pledged Collateral, as
set forth in this Article.

         SECTION 3.1.1     Ownership, No Liens, etc. The Company is the legal
and beneficial owner of, and has good and marketable title to (and has full
right and authority to pledge and assign) such Pledged Collateral, free and
clear of all liens, security interests, options, or other charges or
encumbrances, except any lien or security interest granted pursuant hereto in
favor of the Collateral Trustee.

         SECTION 3.1.2     Valid Security Interest. The delivery of such Pledged
Collateral to the Collateral Trustee is effective to create a valid, perfected,
first priority or second priority, as the case may be, security interest in such
Pledged Collateral and all proceeds thereof, securing the Secured Obligations,
subject in each case to the provisions of Section 3.4 of the Collateral Trust
Agreement. No filing or other action will be necessary to perfect or protect
such security interest.

         SECTION 3.1.3     As to Pledged Shares. In the case of any Pledged
Shares constituting such Pledged Collateral, all of such Pledged Shares are duly
authorized and validly issued, fully paid, and non-assessable, and constitute
all of the issued and outstanding shares of capital stock entitled to vote in
the election of the Board of Directors of each Pledged Share Issuer.

                                   ARTICLE IV
                                    COVENANTS

         SECTION 4.1.      Protect Collateral; Further Assurances, etc. The
Company will not sell, assign, transfer, pledge, or encumber in any other manner
the Pledged Collateral (except in favor of the Collateral Trustee hereunder and
as otherwise expressly permitted by the Secured Debt Documents). The Company
will warrant and defend the right and title herein granted unto the Collateral
Trustee in and to the Pledged Collateral (and all right, title, and interest
represented by the Pledged Collateral) against the claims and demands of all
Persons whomsoever. The Company agrees that at any time, and from time to time,
at the expense of the Company, the

                                       7
<PAGE>

Company will promptly execute and deliver all further instruments, and take all
further action, that may be necessary or desirable, or that the Collateral
Trustee or any Secured Debt Representative may reasonably request, in order to
perfect and protect any security interest granted or purported to be granted
hereby or to enable the Collateral Trustee to exercise and enforce its rights
and remedies hereunder with respect to any Pledged Collateral.

         SECTION 4.2.      Stock Powers, etc. The Company agrees that all
Pledged Shares (and all other shares of capital stock constituting Pledged
Collateral) delivered by the Company pursuant to this Pledge Agreement will be
accompanied by duly executed undated blank stock powers, or other equivalent
instruments of transfer acceptable to the Collateral Trustee. The Company will,
from time to time upon the request of the Collateral Trustee or any Secured Debt
Representative, promptly deliver to the Collateral Trustee such stock powers,
instruments, and similar documents, satisfactory in form and substance to the
Collateral Trustee, with respect to the Pledged Collateral as the Collateral
Trustee or any Secured Debt Representative may reasonably request and will, from
time to time upon the request of the Collateral Trustee after the occurrence of
any Actionable Default, promptly transfer any Pledged Shares or other shares of
common stock constituting Pledged Collateral into the name of any nominee
designated by the Collateral Trustee.

         SECTION 4.3.      Continuous Pledge. Subject to Section 2.5, the
Company will, at all times, keep pledged to the Collateral Trustee pursuant
hereto all Pledged Shares and all other shares of capital stock constituting
Pledged Collateral, all Dividends and Distributions with respect thereto, and
all other Pledged Collateral and other securities, instruments, proceeds, and
rights from time to time received by or distributable to the Company in respect
of any Pledged Collateral.

         SECTION 4.4.      Voting Rights; Dividends, etc. The Company agrees
after any Actionable Default shall have occurred and be continuing and the
Collateral Trustee has notified the Company of the Collateral Trustee's
intention to exercise its voting power under this Section 4.4

                           (i)      the Collateral Trustee may exercise (to the
                  exclusion of the Company) the voting power and all other
                  incidental rights of ownership with respect to any Pledged
                  Shares or other shares of capital stock constituting Pledged
                  Collateral and the Company hereby grants the Collateral
                  Trustee an irrevocable proxy, exercisable under such
                  circumstances, to vote the Pledged Shares and such other
                  Pledged Collateral; and

                           (ii)     promptly to deliver to the Collateral
                  Trustee such additional proxies and other documents as may be
                  necessary to allow the Collateral Trustee to exercise such
                  voting power.

The Collateral Trustee agrees that unless an Actionable Default shall have
occurred and be continuing and the Collateral Trustee shall have given the
notice referred to in Section 4.4(b), the Company shall have the exclusive
voting power with respect to any shares of capital stock (including any of the
Pledged Shares) constituting Pledged Collateral and the Collateral Trustee
shall, upon the written request of the Company, promptly deliver such proxies
and other

                                       8
<PAGE>

documents, if any, as shall be reasonably requested by the Company which are
necessary to allow the Company to exercise voting power with respect to any such
share of capital stock (including any of the Pledged Shares) constituting
Pledged Collateral; provided, however, that no vote shall be cast, or consent,
waiver, or ratification given, or action taken by the Company that would
materially impair any Pledged Collateral or be inconsistent with or violate any
material provision of any of the Secured Debt Documents (including this Pledge
Agreement).

         SECTION 4.5.      Additional Undertakings. The Company will not take or
omit to take any action the taking or the omission of which would result in any
material impairment or material adverse alteration of any obligation of the
maker of any instrument constituting Pledged Collateral.

                                    ARTICLE V
                             THE COLLATERAL TRUSTEE

         SECTION 5.1.      Collateral Trustee Appointed Attorney-in-Fact. The
Company hereby irrevocably appoints the Collateral Trustee the Company's
attorney-in-fact, with full authority in the place and stead of the Company and
in the name of the Company or otherwise, from time to time in the Collateral
Trustee's discretion, to take any action and to execute any instrument which the
Collateral Trustee may deem necessary or advisable to accomplish the purposes of
this Pledge Agreement, including without limitation:

                  (a)      after the occurrence and continuance of an Actionable
         Default, to ask, demand, collect, sue for, recover, compromise, receive
         and give acquittance and receipts for moneys due and to become due
         under or in respect of any of the Pledged Collateral;

                  (b)      to receive, endorse, and collect any drafts or other
         instruments, documents and chattel paper, in connection with clause (a)
         above; and

                  (c)      after the occurrence and continuance of an Actionable
         Default to file any claims or take any action or institute any
         proceedings which the Collateral Trustee may deem necessary or
         desirable for the collection of any of the Pledged Collateral or
         otherwise to enforce the rights of the Collateral Trustee with respect
         to any of the Pledged Collateral.

The Company hereby acknowledges, consents and agrees that the power of attorney
granted pursuant to this Section is irrevocable and coupled with an interest.

         SECTION 5.2.      Collateral Trustee May Perform. If the Company fails
to perform any agreement contained herein, the Collateral Trustee may itself
perform, or cause performance of, such agreement, and the reasonable expenses of
the Collateral Trustee incurred in connection therewith shall be payable by the
Company pursuant to Section 6.4.

         SECTION 5.3       Collateral Trustee's Rights and Duties Subject to
Collateral Trust Agreement. Notwithstanding anything to the contrary contained
in this Pledge Agreement, in acting under and by virtue of this Pledge
Agreement, the Collateral Trustee shall be entitled to all of the rights,
privileges and immunities provided to it in the Collateral Trust Agreement, and
the rights of the Collateral Trustee hereunder are subject in all respects to
the terms, conditions and

                                       9
<PAGE>

limitations set forth in the Collateral Trust Agreement (including, without
limitation, the provisions of Article 5 thereof), reference to which is made for
all purposes; provided, however, that any forbearance by the Collateral Trustee
in exercising any right or remedy available to it under the Collateral Trust
Agreement shall not give rise to a defense on the part of the Company with
respect to the Collateral Trustee's exercise of any right or remedy pursuant to
this Pledge Agreement or as otherwise afforded by applicable law.

                                   ARTICLE VI
                                    REMEDIES

         SECTION 6.1.      Certain Remedies. If an Actionable Default shall have
occurred and be continuing:

                  (a)      The Collateral Trustee may exercise in respect of the
         Pledged Collateral, in addition to other rights and remedies provided
         for herein or otherwise available to it, all the rights and remedies of
         a secured party on default under the U.C.C. (whether or not the U.C.C.
         applies to the affected Pledged Collateral) and also may, without
         notice except as specified below, sell the Pledged Collateral or any
         part thereof in one or more parcels at public or private sale, at any
         of the Collateral Trustee's offices or elsewhere, for cash, on credit
         or for future delivery, and upon such other terms as the Collateral
         Trustee may deem commercially reasonable in each case subject to the
         terms and provisions of the Collateral Trust Agreement. The Company
         agrees that, to the extent notice of sale shall be required by law, at
         least ten days' prior notice to the Company of the time and place of
         any public sale or the time after which any private sale is to be made
         shall constitute reasonable notification. The Collateral Trustee shall
         not be obligated to make any sale of Pledged Collateral regardless of
         notice of sale having been given. The Collateral Trustee may adjourn
         any public or private sale from time to time by announcement at the
         time and place fixed therefor, and such sale may, without further
         notice, be made at the time and place to which it was so adjourned.

                  (b)      The Collateral Trustee may, in each case subject to
         the terms and provisions of the Collateral Trust Agreement,

                           (i)      transfer all or any part of the Pledged
                  Collateral into the name of the Collateral Trustee or its
                  nominee, with or without disclosing that such Pledged
                  Collateral is subject to the lien and security interest
                  hereunder,

                           (ii)     notify the parties obligated on any of the
                  Pledged Collateral to make payment to the Collateral Trustee
                  of any amount due or to become due thereunder,

                           (iii)    enforce collection of any of the Pledged
                  Collateral by suit or otherwise, and surrender, release or
                  exchange all or any part thereof, or compromise or extend or
                  renew for any period (whether or not longer than the original
                  period) any obligations of any nature of any party with
                  respect thereto,

                           (iv)     endorse any checks, drafts, or other
                  writings in the Company's name to allow collection of the
                  Pledged Collateral,

                                       10
<PAGE>

                           (v)      take control of any proceeds of the Pledged
                  Collateral, and

                           (vi)     execute (in the name, place and stead of the
                  Company) endorsements, assignments, stock powers and other
                  instruments of conveyance or transfer with respect to all or
                  any of the Pledged Collateral.

         SECTION 6.2.      Securities Laws. If the Collateral Trustee shall
determine to exercise its right to sell all or any of the Pledged Collateral
pursuant to Section 6.1, the Company agrees that, upon request of the Collateral
Trustee, the Company will, at its own expense:

                  (a)      execute and deliver, and cause each issuer of the
         Pledged Collateral contemplated to be sold and the directors and
         officers thereof to execute and deliver, all such instruments and
         documents, and do or cause to be done all such other acts and things,
         as may be necessary or advisable to register such Pledged Collateral
         under the provisions of the Securities Act of 1933, as from time to
         time amended (the "Securities Act"), and to cause the registration
         statement relating thereto to become effective and to remain effective
         for such period as prospectuses are required by law to be furnished,
         and to make all amendments and supplements thereto and to the related
         prospectus which are necessary or advisable, all in conformity with the
         requirements of the Securities Act and the rules and regulations of the
         Securities and Exchange Commission applicable thereto;

                  (b)      use its best efforts to qualify the Pledged
         Collateral under the state securities or "Blue Sky" laws and to obtain
         all necessary governmental approvals for the sale of the Pledged
         Collateral;

                  (c)      cause each such issuer to make available to its
         security holders, as soon as practicable, an earnings statement that
         will satisfy the provisions of Section 11(a) of the Securities Act; and

                  (d)      do or cause to be done all such other acts and things
         as may be necessary to make such sale of the Pledged Collateral or any
         part thereof valid and binding and in compliance with applicable law.

         SECTION 6.3.      Compliance with Restrictions. The Company agrees that
in any sale of any of the Pledged Collateral whenever an Actionable Default
shall have occurred and be continuing, the Collateral Trustee is hereby
authorized to comply with any limitation or restriction in connection with such
sale as it may be advised by counsel is necessary in order to avoid any
violation of applicable law (including compliance with such procedures as may
restrict the number of prospective bidders and purchasers, require that such
prospective bidders and purchasers have certain qualifications, and restrict
such prospective bidders and purchasers to persons who will represent and agree
that they are purchasing for their own account for investment and not with a
view to the distribution or resale of such Pledged Collateral), or in order to
obtain any required approval of the sale or of the purchaser by any governmental
regulatory authority or official, and the Company further agrees that such
compliance shall not result in such sale being considered or deemed not to have
been made in a commercially reasonable manner, nor shall the Collateral Trustee
be liable nor accountable to the Company for

                                       11
<PAGE>

any discount allowed by the reason of the fact that such Pledged Collateral is
sold in compliance with any such limitation or restriction.

         SECTION 6.4.      Application of Proceeds. All cash proceeds received
by the Collateral Trustee in respect of any sale of, collection from, or other
realization upon, all or any part of the Pledged Collateral shall thereafter be
applied in accordance with Section 3.4 of the Collateral Trust Agreement.

         SECTION 6.5.      Indemnity and Expenses.

                  (a)      The Company agrees to indemnify the Collateral
         Trustee from and against any and all Indemnified Liabilities with
         respect to the execution, delivery, performance, administration or
         enforcement of this Pledge Agreement to the extent provided in Section
         7.8 of the Collateral Trust Agreement.

                  (a)      The Company agrees to reimburse the Collateral
         Trustee for all costs, fees and expenses relating to this Pledge
         Agreement to the extent provided in Section 7.7 of the Collateral Trust
         Agreement.

                                  ARTICLE VII
                            MISCELLANEOUS PROVISIONS

         SECTION 7.1.      Security Document. This Pledge Agreement is a
Security Document executed pursuant to the Collateral Trust Agreement and shall
(unless otherwise expressly indicated herein) be construed, administered and
applied in accordance with the terms and provisions thereof.

         SECTION 7.2.      Amendments, etc. No amendment to or waiver of any
provision of this Pledge Agreement nor consent to any departure by the Company
herefrom shall in any event be effective unless the same shall be in writing and
signed by the Collateral Trustee in accordance with Section 7.1 of the
Collateral Trust Agreement, and then such waiver or consent shall be effective
only in the specific instance and for the specific purpose for which it is
given.

         SECTION 7.3.      Protection of Collateral. The Collateral Trustee may
from time to time, at its option, perform any act which the Company agrees
hereunder to perform and which the Company shall fail to perform after being
requested in writing so to perform (it being understood that no such request
need be given after the occurrence and during the continuance of an Actionable
Default) and the Collateral Trustee may from time to time take any other action
which the Collateral Trustee or any Secured Debt Representative reasonably deems
necessary for the maintenance, preservation or protection of any of the Pledged
Collateral or of its security interest therein.

         SECTION 7.4.      Addresses for Notices. All notices and other
communications provided for hereunder shall be in writing (including telegraphic
communication) and shall be effected in the manner provided for in Section 7.5
of the Collateral Trust Agreement.

         SECTION 7.5.      Section Captions. Section captions used in this
Pledge Agreement are for convenience of reference only, and shall not affect the
construction of this Pledge Agreement.

                                       12
<PAGE>

         SECTION 7.6.      Severability. Wherever possible each provision of
this Pledge Agreement shall be interpreted in such manner as to be effective and
valid under applicable law, but if any provision of this Pledge Agreement shall
be prohibited by or invalid under such law, such provision shall be ineffective
to the extent of such prohibition or invalidity, without invalidating the
remainder of such provision or the remaining provisions of this Pledge
Agreement.

         SECTION 7.7.      Governing Law, Entire Agreement, etc. THIS PLEDGE
AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL
LAWS OF THE STATE OF NEW YORK, EXCEPT TO THE EXTENT THAT THE VALIDITY OR
PERFECTION OF THE SECURITY INTEREST HEREUNDER, OR REMEDIES HEREUNDER, IN RESPECT
OF ANY PARTICULAR COLLATERAL ARE GOVERNED BY THE LAWS OF A JURISDICTION OTHER
THAN THE STATE OF NEW YORK. THIS PLEDGE AGREEMENT AND THE OTHER SECURITY
DOCUMENTS CONSTITUTE THE ENTIRE UNDERSTANDING AMONG THE PARTIES HERETO WITH
RESPECT TO THE SUBJECT MATTER HEREOF AND SUPERSEDE ANY PRIOR AGREEMENTS, WRITTEN
OR ORAL, WITH RESPECT THERETO.

         SECTION 7.8.      Forum Selection and Consent to Jurisdiction. ANY
LITIGATION BASED HEREON, OR ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS
PLEDGE AGREEMENT, OR ANY COURSE OF CONDUCT, COURSE OF DEALING, STATEMENTS
(WHETHER VERBAL OR WRITTEN) OR ACTIONS OF THE COLLATERAL TRUSTEE OR THE COMPANY
SHALL BE BROUGHT AND MAINTAINED EXCLUSIVELY IN THE COURTS OF THE STATE OF NEW
YORK OR IN THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW
YORK; PROVIDED, HOWEVER, THAT ANY SUIT SEEKING ENFORCEMENT AGAINST ANY PLEDGED
COLLATERAL OR OTHER PROPERTY MAY BE BROUGHT, AT THE COLLATERAL TRUSTEE'S OPTION,
IN THE COURTS OF ANY JURISDICTION WHERE SUCH PLEDGED COLLATERAL OR OTHER
PROPERTY MAY BE FOUND. THE COMPANY HEREBY EXPRESSLY AND IRREVOCABLY SUBMITS TO
THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK AND OF THE UNITED STATES
DISTRICT COURT FOR THE SOUTHERN DISTRICT OF NEW YORK FOR THE PURPOSE OF ANY SUCH
LITIGATION AS SET FORTH ABOVE AND IRREVOCABLY AGREES TO BE BOUND BY ANY JUDGMENT
RENDERED THEREBY IN CONNECTION WITH SUCH LITIGATION. THE COMPANY FURTHER
IRREVOCABLY CONSENTS TO THE SERVICE OF PROCESS BY REGISTERED MAIL, POSTAGE
PREPAID, OR BY PERSONAL SERVICE WITHIN OR WITHOUT THE STATE OF NEW YORK. THE
COMPANY HEREBY EXPRESSLY AND IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED
BY LAW, ANY OBJECTION WHICH IT MAY HAVE OR HEREAFTER MAY HAVE TO THE LAYING OF
VENUE OF ANY SUCH LITIGATION BROUGHT IN ANY SUCH COURT REFERRED TO ABOVE AND ANY
CLAIM THAT ANY SUCH LITIGATION HAS BEEN BROUGHT IN AN INCONVENIENT FORUM. TO THE
EXTENT THAT THE COMPANY HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY FROM
JURISDICTION OF ANY COURT OR FROM ANY LEGAL PROCESS (WHETHER THROUGH SERVICE OR
NOTICE, ATTACHMENT PRIOR TO JUDGMENT, ATTACHMENT IN AID OF

                                       13
<PAGE>

EXECUTION OR OTHERWISE) WITH RESPECT TO ITSELF OR ITS PROPERTY, THE COMPANY
HEREBY IRREVOCABLY WAIVES SUCH IMMUNITY IN RESPECT OF ITS OBLIGATIONS UNDER THIS
PLEDGE AGREEMENT.

         SECTION 7.9.      Waiver of Jury Trial. THE COLLATERAL TRUSTEE AND THE
COMPANY HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE ANY RIGHTS THEY
MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR
ARISING OUT OF, UNDER, OR IN CONNECTION WITH, THIS PLEDGE AGREEMENT, OR ANY
COURSE OF CONDUCT, COURSE OF DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN) OR
ACTIONS OF THE COLLATERAL TRUSTEE OR THE COMPANY. THE COMPANY ACKNOWLEDGES AND
AGREES THAT IT HAS RECEIVED FULL AND SUFFICIENT CONSIDERATION FOR THIS PROVISION
(AND EACH OTHER PROVISION OF EACH OTHER SECURED DEBT DOCUMENT TO WHICH IT IS A
PARTY) AND THAT THIS PROVISION IS A MATERIAL INDUCEMENT FOR THE SECURED PARTIES
ENTERING INTO EACH SUCH SECURED DEBT DOCUMENT.

                                       14
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Pledge
Agreement to be duly executed and delivered by their respective officers
thereunto duly authorized as of the day and year first above written.

                                    CALPINE CORPORATION

                                    By: /s/ Michael Thomas
                                       -----------------------------------------
                                    Name: Michael Thomas
                                    Title:

                                    Address: 50 West San Fernando Street
                                             San Jose, CA 95113

                                    Facsimile No.: (408) 995-0505

                                    Attention: Treasurer

                                       15
<PAGE>

                                    THE BANK OF NEW YORK, not in its individual
                                    capacity, but solely as Collateral Trustee

                                    By: /s/ Michael Pitfick
                                       -----------------------------------------
                                    Name: Michael Pitfick
                                    Title: Assistant Vice President

                                       16
<PAGE>

                                                                    ATTACHMENT 1
                                                                              to
                                               Second Amendment Pledge Agreement

                                 PLEDGED SHARES

<TABLE>
<CAPTION>
Pledged Share Issuer:                               Common Stock
--------------------                                ------------
                                                    Outstanding     % of Pledged
                                                      Shares           Shares
                                                      ------           ------
<S>                                                 <C>             <C>
CPN Energy Services, GP, Inc.                          1000             100%
CPN Energy Services, LP, Inc.                          1000             100%
Calpine CCFC II Holdings, Inc.                         1000             100%
Calpine Central, Inc.                                  1000             100%
Calpine Eastern Corporation                            1000             100%
Calpine Dighton, Inc.                                  1000             100%
CPN Auburndale, Inc.                                   1000             100%
Calpine Auburndale, Inc.                               1000             100%
Calpine Gordonsville, Inc.                             1000             100%
Calpine Rumford, Inc.                                   100             100%
Calpine Rumford I, Inc.                                1000             100%
Calpine Tiverton, Inc.                                  100             100%
Calpine Tiverton I, Inc.                                100             100%
Calpine Northeast Marketing, Inc.                       100             100%
Venture Acquisition Company                            1000             100%
Calpine Northbrook Corporation of Maine, Inc.          1000             100%
Androscoggin Energy, Inc.                              1000             100%
Calpine Project Holdings, Inc.                         1000             100%
Calpine Sumas, Inc.                                    1000             100%
Northwest Cogeneration, Inc.                           1000             100%
Calpine King City, Inc.                                1000             100%
Calpine Gilroy 1, Inc.                                 1000             100%
Calpine Gilroy 2, Inc.                                 1000             100%
Sutter Dryers, Inc.                                    1000             100%
Calpine Metcalf EPC, Inc.                              1000             100%
Bellingham Cogen, Inc.                                 1000             100%
GATX/Calpine-Agnews, Inc.                              3000             100%
Calpine Agnews, Inc.                                   1000             100%
Calpine Power Company                                  1000             100%
Calpine Vapor, Inc.                                    1000             100%
Modoc Power, Inc.                                      1000             100%
</TABLE>

<PAGE>

<TABLE>
<S>                                                 <C>                 <C>
Santa Rosa Energy Company                              1000             100%
Geysers Finance Company                             100,000             100%
Calpine Thermal Power, Inc.                            1000             100%
Calpine Operations Management Company, Inc.            1000             100%
Calpine Fuels Corporation                              1000             100%
CPN Pipeline Company                                   1000             100%
Calpine Eastern Holdings, Inc.                         1000             100%
Calpine c*Power, Inc.                                  1000             100%
WRMS Engineering, Inc.                              100,000             100%
CPN Cascade, Inc.                                      1000             100%
CPN Telephone Flat, Inc.                               1000             100%
Anderson Springs Energy Company                        1000             100%
Calpine Sonoma, Inc.                                   1000             100%
Calpine California Holdings, Inc.                      1000             100%
</TABLE>

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