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                       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): May 16, 2002


                            NorthWestern Corporation
             (Exact name of registrant as specified in its charter)


            Delaware                  0-692             46-0172280
(State or other jurisdiction of    (Commission        (IRS Employer
 incorporation or organization)    File Number)     Identification No.)


125 South Dakota Avenue                                          57104
Sioux Falls, South Dakota
(Address of principal executive offices)                      (Zip Code)


Registrant's telephone number, including area code:     (605) 978-2908






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Item 4.  Changes in Registrant's Certifying Accountant.

(a)      Previous Independent Accountants

         (i)  NorthWestern  Corporation  dismissed  Arthur  Andersen  LLP as its
         independent accountants on May 16, 2002.

         (ii) The reports of Arthur Andersen LLP on the financial  statements of
         NorthWestern  Corporation  for the past two fiscal  years  contained no
         adverse  opinion or  disclaimer  of opinion and were not  qualified  or
         modified as to uncertainty, audit scope or accounting principle.

         (iii) The decision to dismiss  Arthur  Andersen LLP was approved by the
         Audit Committee of the Board of Directors of NorthWestern Corporation.

         (iv) During NorthWestern Corporation's two most recent fiscal years and
         through May 16, 2002, there were no disagreements  with Arthur Andersen
         LLP on any matter of  accounting  principles  or  practices,  financial
         statement   disclosure,   or  auditing   scope  or   procedure,   which
         disagreements,  if not resolved to the  satisfaction of Arthur Andersen
         LLP, would have caused Arthur Andersen LLP to make reference thereto in
         its report on the financial statements for such years.

         (v) During NorthWestern  Corporation's two most recent fiscal years and
         through May 16, 2002, there were no "reportable  events" (as defined in
         Regulation S-K Item 304(a)(1)(v)).

         (vi) NorthWestern  Corporation requested Arthur Andersen LLP to furnish
         it with a letter  addressed to the Securities  and Exchange  Commission
         stating  whether  it agrees  with the  above  statements  and,  if not,
         stating the respects in which it does not agree.  A copy of such letter
         from Arthur  Andersen LLP, dated May 16, 2002, is filed as Exhibit 16.1
         to this Form 8-K.

(b)      New Independent Accountants

         (i) NorthWestern  Corporation  engaged Deloitte & Touche LLP as its new
         independent accountants as of May 16, 2002.

         (ii) During NorthWestern Corporation's two most recent fiscal years and
         through May 16, 2002,  NorthWestern  Corporation has not consulted with
         Deloitte & Touche LLP  regarding:  (A) the  application  of  accounting
         principles to a specified  transaction,  either  completed or proposed;
         (B) the type of audit  opinion  that might be rendered on  NorthWestern
         Corporation's  financial statements,  for which either a written report
         or oral advice was provided to NorthWestern Corporation that Deloitte &
         Touche LLP concluded was an important factor considered by NorthWestern
         Corporation  in reaching a decision as to the  accounting,  auditing or
         financial  reporting  issue;  or (C) any  matter  that was  wither  the
         subject  of  a  "disagreement"  (as  defined  in  Regulation  S-K  Item
         304(a)(1)(iv))  of and  the  related  instructions  to  Item  304) or a
         "reportable event" (as defined in Regulation S-K Item 304(a)(1)(v)).







Item 7. Financial Statements, Pro Forma Financial Information and Exhibits.

(c)      Exhibits

Exhibit  16.1  Letter from Arthur  Andersen LLP to the  Securities  and Exchange
               Commission dated May 22, 2002.
Exhibit  99.1  Press Release of NorthWestern Corporation dated May 16, 2002.
Exhibit  99.2  Press Release of NorthWestern Corporation dated May 17, 2002.


Item 9. Regulation FD Disclosure.

         On May 16, 2002,  NorthWestern  Corporation  (NYSE: NOR) issued a press
release confirming its full-year 2002 earnings  estimates,  advising that it has
no knowledge of any reason for the recent unusual trading activity of its stock,
and  reporting  that it has filed its Form 10-K for the quarter  ended March 31,
2002.  On May 17, 2002,  NorthWestern  issued a press release  reaffirming  2002
performance and annualized  free cash flow targets,  announcing the selection of
Deloitte & Touche LLP as its new independent accountants for 2002, and notifying
the investment  community of the company's  investor  webcast held the same day.
The full text of each press  release is set forth in  Exhibit  99.1 and  Exhibit
99.2,  respectively,  hereto.  These  exhibits  are not filed but are  furnished
pursuant to Regulation FD.

SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended,  NorthWestern  Corporation  has duly caused this report to be signed on
its behalf by the undersigned hereunto duly authorized.

                                        NorthWestern Corporation,
                                        a Delaware corporation


Date: May 22, 2002                      By:   /s/ Kipp D. Orme
                                            ---------------------------
                                            Kipp D. Orme
                                            Vice President - Finance and Chief
                                            Financial Officer








                                  EXHIBIT INDEX


Exhibit
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Exhibit 16.1   Letter from Arthur  Andersen LLP to the  Securities  and Exchange
               Commission dated May 22, 2002.

Exhibit 99.1   Press Release of NorthWestern Corporation dated May 16, 2002.

Exhibit 99.2   Press Release of NorthWestern Corporation dated May 17, 2002.