[Signature Page to Amendment to Collateral Trust Agreement]

Exhibit 10.2

EXECUTION COUNTERPART

AMENDMENT NO. 1 TO COLLATERAL TRUST AND INTERCREDITOR AGREEMENT

THIS AMENDMENT NO. 1 TO COLLATERAL TRUST AND INTERCREDITOR AGREEMENT dated as of May 28, 2004 (this “Amendment”) is entered into among Dynegy Holdings, Inc., a Delaware corporation (the “Borrower”), each of the Persons listed on the separate pages hereof under the heading “Grantors” (the “Grantors”), JPMorgan Chase Bank not in its individual capacity but solely as collateral agent under the Credit Agreement referred to below (together with any successor collateral agent, the “Collateral Agent”), Wilmington Trust Company, a Delaware banking corporation, not in its individual capacity but solely as corporate trustee under the Collateral Trust Agreement referred to below (together with any successor corporate trustee, the “Corporate Trustee”) and acknowledged by John M. Beeson, Jr., an individual residing in the State of Delaware, not in his individual capacity but solely as individual trustee under the Collateral Trust Agreement (together with any successor individual trustee, the “Individual Trustee”, and together with the Corporate Trustee, the “Collateral Trustees”).

WHEREAS, the Borrower, Dynegy, Inc., an Illinois corporation (the “Parent Guarantor”), the other Guarantors referred to therein, the Lenders referred to therein, Citibank, N.A. (“Citibank”) and Bank of America, N.A., as Administrative Agents, Citibank, as Payment Agent, Bank One, NA (“Bank One”), as L/C Issuer and Bank One, as Collateral Agent, are parties to the Credit Agreement dated as of April 1, 2003 (as amended, amended and restated, supplemented, replaced, refinanced or otherwise modified and in effect from time to time, the “Existing DHI Credit Agreement”);

WHEREAS, the Parent Guarantor and the Borrower wish to amend and restate the Existing DHI Credit Agreement, as the Credit Agreement dated as of May 28, 2004 (as amended, amended and restated, supplemented, replaced, refinanced or otherwise modified and in effect from time to time, the “Credit Agreement”) among the Borrower, the Parent Guarantor, the other Guarantors party thereto, the Lenders party thereto, Citicorp USA, Inc. and Lehman Commercial Paper Inc., as Administrative Agents, Citicorp USA, Inc., as Payment Agent, JPMorgan Chase Bank, as Collateral Agent, and the L/C Issuers party thereto;

WHEREAS, the Parent Guarantor, the Borrower, the other Grantors referred to therein, the Corporate Trustee and the Individual Trustee are parties to the Collateral Trust and Intercreditor Agreement dated as of April 1, 2003 (as amended, amended and restated, supplemented, replaced or otherwise modified and in effect from time to time, the “Collateral Trust Agreement”);

WHEREAS, Section 9.01(h) of the Collateral Trust Agreement provides that no consent of the Representatives (other than the Required Representative, which, as of the date hereof, is the Collateral Agent) shall be required to amend the Collateral Trust Agreement solely to reflect the facts of a replacement, refinancing or modification to the Existing DHI Credit Agreement and the credit facilities provided in the Credit Agreement;

WHEREAS, the Borrower and the Grantors, with the consent of the Required Representative and the Corporate Trustee, wish to amend the Collateral Trust Agreement to reflect the amendment and restatement of the Existing DHI Credit Agreement, as the Credit Agreement;

NOW, THEREFORE, the parties hereto hereby agree as follows:

SECTION 1. Definitions. Except as otherwise defined in this Amendment, terms defined in the Collateral Trust Agreement are used herein as defined therein (and the principles of interpretation set forth in Section 1.02 of the Collateral Trust Agreement shall apply to such terms).

SECTION 2. Credit Agreement. The Collateral Trust Agreement shall be amended as follows:

(a) Each reference to “Credit Agreement” and “Initial Credit Agreement” in the Collateral Trust Agreement shall be construed as a reference to the Credit Agreement, and definitions incorporated from the Credit Agreement shall be construed accordingly;

(b) each reference to “Lenders” shall be construed as a reference to the Lenders (as defined in the Credit Agreement);

(c) each reference to “Credit Agreement Administrative Agents” shall be construed as a reference to the Administrative Agents (as defined in the Credit Agreement);

(d) each reference to “Credit Agreement Collateral Agent” shall be construed as a reference to the Collateral Agent (as defined in the Credit Agreement);

(e) each reference to “Term A Commitment” shall be amended to be a reference to the Term Commitment (as defined in the Credit Agreement);

(f) each reference to “Junior Secured Obligations” and “Junior Secured Parties” and each provision relating to such references shall be deleted or amended, as applicable, in a manner to reflect the termination of the Term B Facility (as defined in the Existing DHI Credit Agreement) and the absence of any such facility in the Credit Agreement; and

(g) for the avoidance of doubt, each reference to (i) “Senior Secured Credit Agreement Obligations” shall be construed in accordance with the amendments in this Section 2, including definitions incorporated from the Credit Agreement, and shall include the L/C Obligations (as defined in the Credit Agreement) and all of the Obligations of the Loan Parties in respect of the Term Loans and the Revolving Credit Loans (each as defined in the Credit Agreement) under the Loan Documents and (ii) “Credit Agreement Obligations” shall be construed in accordance with the amendments in this Section 2, including definitions incorporated from the Credit Agreement, and shall include all Obligations of the Loan Parties under the Credit Agreement and the Notes issued pursuant thereto.

SECTION 3. Shared Collateral Documents. The Borrower and the Grantors confirm that (i) references in the Shared Collateral Documents to the Existing DHI Credit

Agreement, as modified (whether by amendment, amendment and restatement, supplement, replacement, modification or other like description of modification), now refer to the Credit Agreement and (ii) the Obligations under the Credit Agreement remain secured under the Shared Collateral Documents. Without limiting the foregoing, the Borrower and the Grantors confirm that (i) references in the Shared Security Agreement to the Existing DHI Credit Agreement, as modified (whether by amendment, amendment and restatement, supplement, replacement, modification or other like description of modification), now refer to the Credit Agreement and (ii) the Shared Secured Obligations (as defined in the Credit Agreement) remain and constitute Shared Secured Obligations under the Shared Security Agreement and are secured thereunder.

SECTION 4. Conditions Precedent. The provisions set forth in Section 2 and Section 3 shall become effective as of the date of the satisfaction of each of the conditions precedent set forth in this Section 4:

(a) the conditions required for the Closing Date (as defined in the Credit Agreement) to occur shall have been satisfied or waived in accordance with their respective terms; and

(b) each of the parties hereto have delivered executed counterparts of this Amendment to the Collateral Trustees.

SECTION 5. Miscellaneous.

(a) This Amendment may be executed in separate counterparts, each of which shall be an original and all of which taken together shall constitute one and the same instrument. Delivery of an executed counterpart of this Amendment by fax shall be effective as delivery of an original executed counterpart of this Amendment.

(b) If any provision of this Amendment is held to be illegal, invalid or unenforceable, (i) the legality, validity and enforceability of the remaining provisions of this Amendment shall not be affected or impaired thereby and (ii) the parties shall endeavor in good faith negotiations to replace the illegal, invalid or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the illegal, invalid or unenforceable provisions. The invalidity of a provision in a particular jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

(c) The execution, delivery and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Collateral Trustee under the Collateral Trust Agreement or the other Shared Collateral Documents or constitute a waiver of any provision of the Collateral Trust Agreement or any other Shared Collateral Document.

(d) On and after the effectiveness of this Amendment, each reference in the Collateral Trust Agreement to “this Agreement”, “hereunder”, “hereof” or words of like import referring to the Collateral Trust Agreement, and each reference in the other Loan Documents to “the Collateral Trust Agreement”, “thereunder”, “thereof”, or words of like import referring to the Collateral Trust Agreement shall mean and be a reference to the Collateral Trust Agreement, as amended by this Amendment.

(e) The provisions of this Amendment creating a trust for the benefit of the Representatives on behalf of the Secured Parties (as defined in the Collateral Trust Agreement) and setting forth the rights, duties, obligations and responsibilities of the Collateral Trustees hereunder shall be governed by and construed in accordance with the laws of the State of Delaware, so long as Wilmington Trust Company shall serve as Corporate Trustee under the Collateral Trust Agreement. In all other respects, including, without limitation, all matters governed by the Uniform Commercial Code, and if Wilmington Trust Company shall cease to serve as Corporate Trustee under the Collateral Trust Agreement, this Amendment shall be governed by and construed in accordance with the laws of the State of New York, except as otherwise required by mandatory provisions of law.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed as of the day and year first above written.

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]

[Signature Page to Amendment to Collateral Trust Agreement]