As filed with the Securities and Exchange Commission on August 5, 1998


                       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) July 31, 1998


                             MARKETSPAN CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)


                                    New York
                 (State or Other Jurisdiction of Incorporation)


            1-14161                            11-3431358
(Commission File Number)                     (IRS Employer Identification No.)


175 East Old Country Road, Hicksville, New York                      11801
(Address of Principal Executive Offices)                          (Zip Code)


                                 (516) 755-6650
              (Registrant's Telephone Number, Including Area Code)


                                       N/A
          (Former Name or Former Address, if Changed Since Last Report)

                                     Page 1
                             Exhibit Index on Page 5









Item 5.     Other Events
            ------------

     On July 31, 1998, MarketSpan Corporation (the "Company") announced that Dr.
William J. Catacosinos had resigned as Chairman and Chief Executive  Officer and
as a director,  and that the Company's  Board of Directors had elected Robert B.
Catell,  the Company's  President,  to succeed Dr.  Catacosinos  as Chairman and
Chief Executive Officer.  Attached hereto as Exhibit 99.1 is the Company's press
release  with  respect  to  the  foregoing,  which  is  incorporated  herein  by
reference.

     On August 3, 1998,  the Company  announced  that its Board of Directors had
authorized the purchase of up to 10% of the Company's  outstanding common stock,
or approximately 15 million shares, through open market purchases. Purchases are
expected to commence  following the public  release of the Company's  historical
and pro forma consolidated condensed financial information for the periods ended
June 30, 1998 and its related  required filings with the Securities and Exchange
Commission.  Attached hereto as Exhibit 99.2 is the Company's press release with
respect to the foregoing, which is incorporated herein by reference.

     On August 3, 1998,  following  announcement  of the  Company's  open market
purchase  program,  Mr.  Catell  and  Craig G.  Matthews,  the  Company's  Chief
Financial  Officer,  held a conference call with security analysts regarding the
Company's future and strategy.  Attached hereto as Exhibit 99.3 is a copy of Mr.
Catell's   prepared  remarks  for  the  foregoing   conference  call,  which  is
incorporated herein by reference.

     On August 4, 1998,  the  Company  announced  that its  subsidiary,  KeySpan
Energy  Development  Corporation,  had joined  Duke Energy  Corporation  and the
Williams  Companies  in  developing  the  Cross  Bay(sm)  pipeline,  which  will
transport gas from existing interstate  pipelines in New Jersey to New York City
and  Long  Island.   These  existing   pipelines,   operated  by  Texas  Eastern
Transmission  Corporation and Transcontinental  Gas Pipe Lines Corporation,  are
owned  by  Duke  Energy  and  Williams,  respectively.  In the  first  stage  of
development,  expected to cost  approximately  $45 million with KeySpan Energy's
share at $11.3  million,  the Cross  Bay(sm)  group will  build new  compression
facilities and expand  current  pipelines to transport an additional 125 million
cubic  feet of gas per day to New  York  City and Long  Island.  To meet  future
regional demand,  Cross Bay(sm) may be expanded to carry up to 700 million cubic
feet per day.  The new  system is  scheduled  to begin  operation  in the fourth
quarter of 2000,  and the Cross Bay(sm) group expects to file its plans with the
Federal Energy  Regulatory  Commission in the fourth  quarter of 1998.  Attached
hereto as  Exhibit  99.4 is the  Company's  press  release  with  respect to the
foregoing, which is incorporated herein by reference.



                                     Page 2







     The   Exhibits   incorporated   by   reference   in  this  Item  5  include
forward-looking  statements  within the meaning of Section 21E of the Securities
Exchange  Act  of  1934.  These  forward-looking   statements  reflect  numerous
assumptions and involve a number of risks and  uncertainties.  Among the factors
that could cause actual  results to differ  materially  are:  electric  load and
customer growth; abnormal weather conditions; available sources and cost of fuel
and generating  capacity;  the speed and degree to which competition  enters the
power generation, wholesale and retail sectors of the electric utility industry;
state and federal  regulatory  initiatives that increase  competition,  threaten
cost and investment  recovery,  and impact rate  structures;  the ability of the
Company  to  successfully  reduce  its cost  structure;  the degree to which the
Company  develops  non-regulated  business  ventures;  the economic  climate and
growth  in  the  Company's  service  territories;  economies  generated  by  the
combination  of the  Company's  predecessors;  inflationary  trends and interest
rates; and other risks detailed from time to time in reports and other documents
filed by the Company  and its  predecessors  with the  Securities  and  Exchange
Commission.

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

     (a)-(b) Not applicable.

     (c) See "Index to Exhibits" on page 5.



                                     Page 3







                                   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.



                                      MARKETSPAN CORPORATION



Dated:  August 5, 1998                By: /s/ Joseph E. Fontana
                                          --------------------- 
                                          Name:  Joseph E. Fontana
                                          Title: Vice President, Controller
                                                 and Chief Accounting Officer





                                     Page 4





                                INDEX TO EXHIBITS



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

      99.1               Press Release, dated July 31, 1998.
      99.2               Press Release, dated August 3, 1998.
      99.3               Prepared remarks for August 3, 1998 conference call.
      99.4               Press Release, dated August 4, 1998.










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