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 21, 2002


                                    NISOURCE INC.
                                    -------------
                  (Exact Name of Registrant as Specified in Charter)

                Delaware              001-16189             35-2108964
             (State or Other       (Commission File       (IRS Employer
             Jurisdiction of           Number)         Identification No.)
             Incorporation)

                                COLUMBIA ENERGY GROUP
                                ---------------------
                  (Exact Name of Registrant as Specified in Charter)

                Delaware               001-1098             13-1594808
             (State or Other       (Commission File       (IRS Employer
             Jurisdiction of           Number)         Identification No.)
             Incorporation)

                       NORTHERN INDIANA PUBLIC SERVICE COMPANY
                       ---------------------------------------
                  (Exact Name of Registrant as Specified in Charter)

                Indiana                 1-4125              35-0552990
             (State or Other       (Commission File       (IRS Employer
             Jurisdiction of           Number)         Identification No.)
             Incorporation)

                                    801 East 86th
                                       Avenue,
                                    Merrillville,
                                    Indiana 46410
                                    (877) 647-5990
                                     (Address and
                                 Telephone Number of
                                 Principal Executive
                                       Offices)


   Item 4.   Changes in Registrant's Certifying Accountant.

        On May 21, 2002, the Board of Directors of NiSource Inc. (the
   "Company"), upon recommendation of its Audit Committee, dismissed
   Arthur Andersen LLP ("Andersen") as the independent public accountants
   for the Company and its subsidiaries, Columbia Energy Group and
   Northern Indiana Public Service Company (collectively, the
   "Registrants"), and decided to engage Deloitte & Touche LLP to serve
   as the Registrants' independent public accountants for 2002.

        Andersen's reports on the Registrants' consolidated financial
   statements for each of the two most recent fiscal years did not
   contain an adverse opinion or disclaimer of opinion, nor were they
   qualified or modified as to uncertainty, audit scope or accounting
   principles.

        In connection with its audits for the Registrants' two most
   recent fiscal years and the subsequent interim period, there have been
   no disagreements between the Registrants and Andersen on any matter of
   accounting principles and practices, financial statement disclosure or
   auditing scope or procedure, which disagreements, if not resolved to
   Andersen's satisfaction, would have caused Andersen to make reference
   to the subject matter of the disagreement in connection with its
   report on any Registrant's consolidated financial statements for any
   such year.

        During the Company's two most recent fiscal years and through May
   21, 2002, there have been no reportable events as defined in Item
   304(a)(1)(v) of Regulation S-K.

        The Registrants have requested Andersen to furnish it with a
   letter addressed to the Securities and Exchange Commission stating
   whether Andersen agrees with the above statements made by the
   Registrants.  A copy of the letter, dated May 21, 2002, is filed as
   Exhibit 16.1 to this Current Report on Form 8-K.

        During the Registrants' two most recent fiscal years and through
   May 21, 2002, the Registrants did not consult Deloitte & Touche LLP
   with respect to the application of accounting principles to a
   specified transaction, either completed or proposed, or the type of
   audit opinion that might be rendered on any Registrant's consolidated
   financial statements, or any other matters or reportable events listed
   in Items 304(a)(2)(i) and (ii) of Regulation S-K.


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

        (c)  Exhibits.

             Exhibit
             Number                   Description
             -------                  -----------

             16.1      Letter of Arthur Andersen LLP regarding change in
                       certifying accountant.

             99.1      Press Release dated May 21, 2002.


                                 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.

                                      NISOURCE INC.


   Date:     May 21, 2002             By:    /s/ Stephen P. Adik
                                           -----------------------------
                                           Stephen P. Adik
                                           Vice Chairman

                                      COLUMBIA ENERGY GROUP


   Date:     May 21, 2002             By:    /s/ Michael W. O'Donnell
                                           -----------------------------
                                           Michael W. O'Donnell
                                           President

                                      NORTHERN INDIANA PUBLIC
                                      SERVICE COMPANY


   Date:     May 21, 2002             By:    /s/ Barrett Hatches
                                           -----------------------------
                                           Barrett Hatches
                                           President and Chief
                                           Executive Officer



                                EXHIBIT INDEX

    Exhibit No.     Description
    ----------      -----------

    16              Letter of Arthur Andersen LLP regarding change in
                    certifying accountant.

    99.1            Press Release dated May 21, 2002