- -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 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): December 31, 2003 NorthWestern Corporation (Exact name of registrant as specified in its charter) Delaware 0-692 46-0172280 (State or other jurisdiction of (Commission File Number) (IRS Employer incorporation) Identification No.) 125 South Dakota Avenue 57104 Sioux Falls, South Dakota (Zip Code) (Address of principal executive offices) (605) 978-2908 --------------------------------------- (Registrant's telephone number, including area code) - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Item 5. Other Events On December 31, 2003, NorthWestern Corporation issued a press release announcing that the U.S. Securities and Exchange Commission has issued subpoenas to Blue Dot Services Inc. and Expanets, Inc. requesting the production of documents as part of a now formal investigation of NorthWestern. The press release is included as Exhibit 99.1 hereto and is incorporated herein by reference. Item 7. Financial Statements and Exhibits EXHIBIT NO. DESCRIPTION OF DOCUMENT - -------------------------------------------------------------------------------- 99.1* Press Release of NorthWestern Corporation dated December 31, 2003 * filed herewith 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 hereunto duly authorized. NorthWestern Corporation By: /s/ Roger P. Schrum ------------------------------------ Roger P. Schrum Vice President of Human Resources and Communications Date: December 31, 2003 3 Index to Exhibits ----------------- EXHIBIT NO. DESCRIPTION OF DOCUMENT - -------------------------------------------------------------------------------- 99.1* Press Release of NorthWestern Corporation dated December 31, 2003 * filed herewith 4