SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 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): May 31, 2004 NISOURCE INC. ------------- (Exact Name of Registrant as Specified in Its Charter) DELAWARE 001-16189 35-2108964 --------------------------- ----------------- ------------------- State or Other Jurisdiction (Commission File (IRS Employer of Incorporation Number) Identification No.) 801 E. 86th Avenue, Merrillville, Indiana 46410 -------------------------------------------------------------------- (Address of Principal Executive Offices) (Zip Code) Registrant's telephone number, including area code (877) 647-5990 ----------------- ------------------------------------------------------------------- (Former Name or Former Address, if Changed Since Last Report) ITEM 9. REGULATION FD DISCLOSURE. NiSource Inc. is furnishing this Report on Form 8-K in connection with the disclosure of a press release by its subsidiary, Northern Indiana Public Service Company ("NIPSCO"), on May 31, 2004. This information has also been published on NIPSCO's website (www.nipsco.com). Exhibit 99 Press Release, dated May 31, 2004, issued by Northern Indiana Public Service Company and published on the NIPSCO website. SIGNATURE Pursuant to the requirement of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. NISOURCE INC. (Registrant) Dated: June 1, 2004 By: /s/ Gary W. Pottorff -------------------------- Name: Gary W. Pottorff Title: Secretary Index to Exhibits ----------------- Exhibit Number Exhibit Title -------------- ------------- 99 Press Release, dated May 31, 2004, issued by Northern Indiana Public Service Company