<Page> EXHIBIT I CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 33-60278) of Dynegy Inc. of our report dated September 28, 2001 relating to the financial statements of the Illinois Power Company Incentive Savings Plan, which appears in this Form 11-K. /s/ PricewaterhouseCoopers LLP October 17, 2001