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) February 12, 1999
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                              BAY STATE GAS COMPANY
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             (Exact Name of Registrant as Specified in its Charter)


       Massachusetts                  1-7479                     04-2548120
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(State or Other Jurisdiction       (Commission                  (IRS Employer
     of Incorporation)             File Number)              Identification No.)


  300 Friberg Parkway, Westborough, MA                                01581-5039
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(Address of Principal Executive Offices)                              (Zip Code)


Registrant's telephone number, including area code (508) 836-7000
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          (Former Name or Former Address, if Changed Since Last Report)



Item 1.  Change in Control.

     On February  12,  1999,  pursuant to the  previously  reported  Amended and
Restated Agreement and Plan of Merger dated as of December 18, 1997, and amended
and  restated as of March 4, 1998 and as further  amended on  November  16, 1998
(the "Merger Agreement") among NIPSCO Industries, Inc. ("NIPSCO"), Bay State Gas
Company ("Bay State") and Acquisition  Gas Company,  Inc.  ("Acquisition"),  Bay
State was  merged  with and into  Acquisition  (the  "Merger"),  a wholly  owned
subsidiary of NIPSCO.  Acquisition  was the surviving  corporation in the Merger
and, in connection therewith, changed its name to Bay State Gas Company.

     Pursuant  to the Merger  Agreement,  each share of Bay State  common  stock
outstanding  at the  effective  time of the Merger became  exchangeable  for (i)
$40.00 in cash  (subject to the proration  provisions of the Merger  Agreement),
(ii)  1.4414  shares  of  NIPSCO  common  stock  or (iii) a  combination  of the
foregoing.  Holders of shares of Bay State common  stock will shortly  receive a
Letter of Transmittal/Form of Election providing information with regard to this
conversion,  including instructions for electing the form of consideration to be
received.  Fractional  shares will not be issued,  except to participants in the
Bay State Dividend  Reinvestment  and Stock Purchase Plan (the "Bay State DRIP")
whose  accounts  will  automatically  be  transferred  to the  NIPSCO  Automatic
Dividend  Reinvestment and Share Purchase Plan unless they have elected cash for
such Bay State DRIP shares. In lieu of fractional  shares,  holders thereof will
receive cash.



                                    SIGNATURE

     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.

                                            BAY STATE GAS COMPANY


Dated:  February 12, 1999                   By: /s/ Thomas W. Sherman
                                                ----------------------
                                                Name:  Thomas W. Sherman
                                                Title: Executive Vice-President,
                                                       Chief Financial Officer
                                                       and Treasurer