UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) December 14, 1998 Commission Registrants; State of Incorporation; IRS Employer File Number Address; and Telephone Number Identification No. 1-11327 Illinova Corporation 37-1319890 (an Illinois Corporation) 500 S. 27th Street Decatur, IL 62525 (217) 424-6600 1-3004 Illinois Power Company 37-0344645 (an Illinois Corporation) 500 S. 27th Street Decatur, IL 62525 (217) 424-6600 Total number of sequentially numbered pages is 10. Item 7. Exhibits - -------------------------------------------------------------------------------- (c) Exhibits (99.1) Letter to the Financial Community, dated December 9, 1998 (99.2) Press Release, dated December 9, 1998 (99.3) Press Release, dated December 11, 1998 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ILLINOVA CORPORATION (Registrant) By /s/ Charles E. Bayless --------------------------- Charles E. Bayless Chairman, President, and Chief Executive Officer on behalf of Illinova Corporation Date: December 14, 1998 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ILLINOIS POWER COMPANY (Registrant) By /s/ Charles E. Bayless --------------------------- Charles E. Bayless Chairman, President, and Chief Executive Officer on behalf of Illinois Power Company Date: December 14, 1998 3 Exhibit Index The following Exhibits are hereby filed as part of this Current Report on Form 8-K: Exhibit Number Description 99.1 Letter to the Financial Community, dated December 9, 1998 99.2 Press Release, dated December 9, 1998 99.3 Press Release, dated December 11, 1998 4