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) :     November 4, 1999


                               KEYSPAN 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
                 One MetroTech Center, Brooklyn, New York 11201
               (Address of Principal Executive Offices) (Zip Code)

                           (516) 755-6650 (Hicksville)
                           (718) 403-1000 (Brooklyn)
              (Registrant's Telephone Number, Including Area Code)



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






Item 5. Other Events.

As described in the joint press release of KeySpan  Corporation  (the "Company")
and Eastern  Enterprises  dated  November 4, 1999 (a copy of which is annexed as
Exhibit 99.1), the Company and Eastern Enterprises ("Eastern") have entered into
an Agreement  and Plan of Merger,  dated as of November 4, 1999 (a copy of which
is annexed as Exhibit 2) pursuant to which  Eastern  will become a  wholly-owned
subsidiary of the Company.  The  transaction has a value of  approximately  $2.5
billion, including assumption of debt and preferred stock.

Under the agreement, the Company will acquire all of the common stock of Eastern
for  $64.00 per share in an  all-cash  transaction.  The merger is  conditioned,
among other things, upon the approval of Eastern Enterprises' shareholders,  and
receipt of the required regulatory  approvals.  The Company anticipates that the
transaction can be completed in 9 to 12 months.


Item 7.        Financial Statements and Exhibits.

(c)     Exhibits

Exhibit 2.            Agreement and Plan of Merger,  dated as of November 4,
                      1999,   by  and   among   KeySpan   Corporation,   Eastern
                      Enterprises and ACJ Acquisition LLC.

Exhibit 99.1          Joint  Press  Release  of  KeySpan  Corporation  and
                      Eastern Enterprises dated November 4, 1999.













                                   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.



                                     KEYSPAN CORPORATION

Dated: November 5, 1999             By:  /s/ Gerald Luterman
                                    --------------------------
                                      Name:   Gerald Luterman
                                      Title:  Senior Vice President and
                                              Chief Financial Officer







                                   INDEX TO EXHIBITS



Exhibit No.       Exhibit                                                  Page

2                 Agreement and Plan of Merger, dated as of November 4,      5
                  1999, by and among KeySpan Corporation, Eastern
                  Enterprises and ACJ Acquisition LLC.

99.1              Joint  Press  Release of  KeySpan  Corporation  and        50
                  Eastern Enterprises, dated November 4, 1999.