EXHIBIT 31.1



SECTION 302 CERTIFICATION



I, Bruce A. Williamson, certify that:



|1. | I have reviewed this quarterly report on Form 10-Q of Dynegy Holdings Inc. (Dynegy);
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|2. | Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition,
results of operations and cash flows of Dynegy as of, and for, the periods presented in this quarterly report;
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|4. | Dynegys other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Dynegy and have:
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| | (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to Dynegy, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;
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| | (b) | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
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| | (c) | Evaluated the effectiveness of Dynegys disclosure controls and procedures and presented in this quarterly report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this quarterly report based on such evaluation; and
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| | (d) | Disclosed in this quarterly report any change in Dynegys internal control over financial reporting that occurred during Dynegys most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, Dynegys internal control over financial reporting; and
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|5. | Dynegys other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Dynegys auditors and the
audit committee of Dynegys board of directors (or persons performing the equivalent functions):
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| | (a) | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect
Dynegys ability to record, process, summarize and report financial information; and
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| | (b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in Dynegys internal control over financial reporting.
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|                      |  |     |  |                                                          
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|Date: August 11, 2005 |  | By: |  | /s/ BRUCE A. WILLIAMSON                                  
|                      |  |     |  | Bruce A. Williamson President and Chief Executive Officer