LONG ISLAND LIGHTING CO
SC 13D, 1997-10-24
ELECTRIC & OTHER SERVICES COMBINED
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           KEYSPAN ENERGY CORPORATION
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                   COMMON STOCK, PAR VALUE $0.33 1/3 PER SHARE
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    114259104
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                               LEONARD P. NOVELLO,
                    SENIOR VICE PRESIDENT AND GENERAL COUNSEL
                          LONG ISLAND LIGHTING COMPANY
                            175 EAST OLD COUNTRY ROAD
                           HICKSVILLE, NEW YORK 11801
                                 (516) 545-5162
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                     Copy to
                            THOMAS E. CONSTANCE, ESQ.
                        KRAMER, LEVIN, NAFTALIS & FRANKEL
                                919 THIRD AVENUE
                            NEW YORK, NEW YORK 10022
                                 (212) 715-9100


                                OCTOBER 17, 1997
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

                               Page 1 of 15 Pages


<PAGE>


CUSIP NO.    114259104                                        Page 2 of 15 Pages

                                  SCHEDULE 13D

1.       NAME OF REPORTING PERSON
         SS OR I.R.S IDENTIFICATION NO. OF ABOVE PERSON

         Long Island Lighting Company
         11-1019782

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP     (a)  [ ]

                                                              (b)  [ ]

3.       SEC USE ONLY

4.       SOURCE OF FUNDS
         WC

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) OR 2(e)

6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         New York
                                        
                    7.       SOLE VOTING POWER        
NUMBER OF                    0                        
SHARES                                                
BENEFICIALLY        8.       SHARES VOTING POWER      
OWNED BY                     0                        
EACH                                                  
REPORTING           9.       SOLE DISPOSITIVE POWER   
PERSON                       0                        
WITH                                                  
                    10.      SHARES DISPOSITIVE POWER 
                             0                        

11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         9,948,682 shares of Common Stock.

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES

                                                                             [ ]

13.      PERCENT OF CLASS  REPRESENTED  BY AMOUNT IN ROW (11) 16.6%.  Based upon
         49,993,378  shares of Common Stock outstanding as of December 18, 1996,
         as represented by Issuer,  calculated  pursuant to Rule 13d-3(d)(1) and
         assuming,  solely for purposes of such calculation,  that the option to
         purchase such shares has been exercised.

14.      TYPE OF REPORTING PERSON
         CO


<PAGE>

ITEM 1.  SECURITY AND ISSUER.

         This Schedule 13D relates to the common stock,  par value $0.33 1/3 per
share  ("KeySpan  Common  Stock"),  of KEYSPAN  ENERGY  CORPORATION,  a New York
corporation  ("KeySpan"),  previously a wholly-owned  subsidiary of The Brooklyn
Union Gas Company  ("Brooklyn  Union"),  which became  Brooklyn  Union's  parent
holding  company in connection  with a  restructuring  of Brooklyn  Union into a
holding company format pursuant to a mandatory  exchange of shares with KeySpan.
The principal  executive offices of KeySpan are located at One Metrotech Center,
Brooklyn, New York 11201-3850.

ITEM 2. IDENTITY AND BACKGROUND.

         This Schedule 13D is filed by Long Island Lighting Company,  a New York
corporation  ("LILCO").  LILCO  supplies  electric and gas service in Nassau and
Suffolk  Counties and to the Rockaway  Peninsula in Queens  County,  all on Long
Island,  New York.  LILCO's principal  executive offices are located at 175 East
Old Country Road, Hicksville, New York 11801.

         Each  executive  officer and each director of LILCO is a citizen of the
United States.  The name,  business address and present principal  occupation of
each  executive  officer and director are set forth in Annex I to this  Schedule
13D which is incorporated herein by this reference.

         During the last five years, to the best of LILCO's  knowledge,  neither
LILCO nor any of its  executive  officers or directors  has been  convicted in a
criminal  proceeding  (excluding traffic violations or similar  misdemeanors) or
has been a party to a civil proceeding of a judicial or  administrative  body of
competent  jurisdiction  as a result  of which  LILCO or such  person  was or is
subject to a judgment,  decree or final order enjoining future violations of, or
prohibiting  or mandating  activities  subject to,  federal or state  securities
laws, or finding any violation  with respect to such laws,  and which  judgment,
decree or final order was not subsequently vacated.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Pursuant to the  Amended  and  Restated  Brooklyn  Union  Stock  Option
Agreement  (the "Brooklyn  Union Stock Option  Agreement"  and, as amended,  the
"KeySpan Stock Option  Agreement"),  dated as of June 26, 1997, between Brooklyn
Union  and  LILCO,  as  amended  by the  Amendment,  Assignment  and  Assumption
Agreement  (the  "Amendment"),  dated  as of  September  29,  1997 by and  among
Brooklyn  Union,  LILCO and KeySpan,  which was signed by the parties thereto on
October 17, 1997,  KeySpan  granted  LILCO an  irrevocable  option (the "KeySpan
Option") to purchase from KeySpan,  under certain  circumstances  and subject to
certain  adjustments,  up to 9,948,682 authorized and unissued shares of KeySpan
Common Stock, at a price per share of $30.0375 (the


                               Page 3 of 15 Pages

<PAGE>

"Purchase  Price"),  payable,  at LILCO's option,  (a) in cash or (b) subject to
KeySpan's having obtained the approvals of any governmental  authority  required
for KeySpan to acquire such shares of LILCO Common Stock (as defined below) from
KeySpan,  in shares of Common Stock, par value $5.00 per share, of LILCO ("LILCO
Common Stock").

         As of the date  hereof,  the  KeySpan  Option is not  exercisable.  The
shares of KeySpan  Common Stock subject to the KeySpan  Option would equal 19.9%
of the outstanding  KeySpan Common Stock before giving effect to the exercise of
the  KeySpan  Option and 16.6% of the  outstanding  KeySpan  Common  Stock after
giving   effect  to  the  exercise  of  the  KeySpan   Option.   Under   certain
circumstances,  LILCO may require  KeySpan to, or KeySpan may be  permitted  to,
repurchase  for cash the KeySpan  Option and any shares of KeySpan  Common Stock
acquired pursuant to the exercise of the KeySpan Option.

         The  KeySpan  Option  was  originally  granted by  Brooklyn  Union as a
condition of and in consideration for LILCO entering into the Agreement and Plan
of Exchange,  by and among NYECO CORP.,  Brooklyn  Union and LILCO,  dated as of
December  29,  1996,  which was amended and restated in the Amended and Restated
Agreement and Plan of Exchange and Merger between Brooklyn Union and LILCO dated
as of June 26, 1997 (as amended, the "Brooklyn Union/LILCO Agreement"),  and the
LILCO Stock Option Agreement,  by and between Brooklyn Union and LILCO, dated as
of December 29, 1996, which was amended and restated in the Amended and Restated
LILCO Stock Option  Agreement  between Brooklyn Union and LILCO dated as of June
26, 1997 (as amended, the "LILCO Stock Option Agreement").

         The  exercise  of the  KeySpan  Option  for the full  number  of shares
currently covered thereby would require  aggregate funds of $298,833,535.  It is
anticipated that, should the KeySpan Option become  exercisable and should LILCO
determine to exercise the KeySpan Option for cash,  LILCO would obtain the funds
from working  capital or by borrowing  from  parties  whose  identity is not yet
known.

         A copy of the Brooklyn Union/LILCO Agreement is included as Exhibit 2.2
to this Schedule 13D and is incorporated herein by this reference. A copy of the
LILCO Stock Option Agreement is included as Exhibit 2.3 to this Schedule 13D and
is  incorporated  herein by this  reference.  A copy of the Brooklyn Union Stock
Option  Agreement  is  included  as  Exhibit  2.4 to  this  Schedule  13D and is
incorporated  herein by this  reference.  A copy of the Amendment is included as
Exhibit 2.5 to this Schedule 13D and is  incorporated  herein by this reference.
The foregoing discussion of the Brooklyn Union/LILCO Agreement,  the LILCO Stock
Option  Agreement,  the Brooklyn Union Stock Option  Agreement and the Amendment
are qualified in their entirety by reference to such exhibits.


                               Page 4 of 15 Pages

<PAGE>

ITEM 4. PURPOSE OF TRANSACTION.

         In connection with the grant of the KeySpan Option,  Brooklyn Union and
LILCO entered into the Brooklyn Union/LILCO Agreement,  pursuant to which, among
other matters and subject to the terms and  conditions set forth in the Brooklyn
Union/LILCO  Agreement,  each  outstanding  share of LILCO  Common Stock will be
exchanged for .803 (the  "Ratio") of a newly issued share of Common  Stock,  par
value $0.01 per share, of a holding company (the "Holding Company Common Stock")
and each  outstanding  share of KeySpan  Common Stock will be exchanged  for one
newly issued share of Holding Company Common Stock  (collectively,  the "Binding
Share  Exchanges").  Also in  connection  with the grant of the KeySpan  Option,
KeySpan and LILCO  entered  into the LILCO Stock Option  Agreement,  pursuant to
which LILCO  granted  KeySpan an  irrevocable  option  (the  "LILCO  Option") to
purchase  from  LILCO,  under  certain  circumstances  and  subject  to  certain
adjustments,  up to 23,981,964  authorized  and unissued  shares of LILCO Common
Stock, at a price per share of $19.725,  payable,  at KeySpan's  option,  (a) in
cash  or  (b)  subject  to  KeySpan's  having  obtained  the  approvals  of  any
governmental  authority  required  for  KeySpan to acquire  such shares of LILCO
Common Stock from LILCO,  in shares of LILCO Common Stock.  The LILCO Option was
granted by LILCO as a condition  of and in  consideration  for KeySpan  entering
into the Brooklyn Union/LILCO Agreement and the KeySpan Stock Option Agreement.

         The terms and conditions of the Brooklyn Union/LILCO  Agreement are set
forth in the Joint Proxy  Statement,  a copy of which is included as Exhibit 2.1
to this Schedule 13D and is incorporated herein by this reference. The foregoing
discussion of the Brooklyn Union/LILCO Agreement is qualified in its entirety by
reference to such exhibit.

         Except as set forth  herein,  LILCO does not have any current  plans or
proposals that relate to or would result in (i) the acquisition by any person of
additional  shares  of  KeySpan  Common  Stock or the  disposition  of shares of
KeySpan Common Stock;  (ii) an extraordinary  corporate  transaction,  such as a
merger,  reorganization  or  liquidation,   involving  KeySpan  or  any  of  its
subsidiaries;  (iii) a sale or  transfer  of any  material  amount  of assets of
KeySpan  or any of its  subsidiaries;  (iv) any change in the  present  board of
directors or management  of KeySpan,  including any plans or proposals to change
the number or term of directors or to fill any  vacancies on the board;  (v) any
material  change in the present  capitalization  or dividend  policy of KeySpan;
(vi) any other  material  change in KeySpan's  business or corporate  structure;
(vii) any change in  KeySpan's  Certificate  of  Incorporation  or  By-laws,  or
instruments  corresponding  thereto,  or  other  actions  that  may  impede  the
acquisition  of  control of KeySpan  by any  person;  (viii)  causing a class of
securities of KeySpan to be delisted from a national  securities  exchange or to
cease to be authorized to be quoted in an inter-


                               Page 5 of 15 Pages

<PAGE>

dealer quotation system of a registered national securities association;  (ix) a
class of equity  securities  of KeySpan  becoming  eligible for  termination  of
registration  pursuant to Section  12(g)(4) of the  Securities  Exchange  Act of
1934, as amended; or (x) any action similar to any of those enumerated above.

ITEM 5. INTEREST IN SECURITIES OF ISSUER.

         Although the KeySpan Option does not allow LILCO to purchase any shares
of KeySpan  Common Stock  pursuant  thereto  unless and until the  conditions to
exercise  specified in the KeySpan Stock Option  Agreement  occur,  assuming for
purposes of this Item 5 that such conditions are satisfied and LILCO is entitled
to purchase shares of KeySpan Common Stock pursuant to the KeySpan Option, LILCO
would  currently  be  entitled to purchase  9,948,682  shares of KeySpan  Common
Stock, or approximately 19.9% of the currently  outstanding KeySpan Common Stock
before  giving  effect to the  exercise of the  KeySpan  Option and 16.6% of the
currently  outstanding  KeySpan Common Stock after giving effect to the exercise
of the KeySpan  Option  (based upon  49,993,378  shares of KeySpan  Common Stock
outstanding  as of December 18, 1996, as  represented by KeySpan in the Brooklyn
Union/LILCO Agreement).

         LILCO does not have the right to acquire  any shares of KeySpan  Common
Stock under the KeySpan Option unless  certain  events  specified in the KeySpan
Stock Option  Agreement occur.  Accordingly,  LILCO does not have sole or shared
voting or  dispositive  power with respect to any shares of KeySpan Common Stock
purchasable under the KeySpan Option, and LILCO disclaims  beneficial  ownership
of KeySpan  Common Stock subject to the KeySpan  Option until such events occur.
Assuming  for  purposes of this Item 5 that events  occurred  that would  enable
LILCO to exercise the KeySpan  Option and LILCO  exercised  the KeySpan  Option,
LILCO would have sole voting  power and sole  dispositive  power with respect to
the shares of KeySpan Common Stock acquired pursuant to the KeySpan Option.

         The foregoing  description of certain terms of the KeySpan Stock Option
Agreement is qualified in its entirety by reference to the Brooklyn  Union Stock
Option Agreement which is filed as Exhibit 2.4 hereto and to the Amendment which
is filed as  Exhibit  2.5  hereto  and  which  are  incorporated  herein by this
reference.

         To the best of LILCO's  knowledge,  no executive officer or director of
LILCO  beneficially owns any shares of KeySpan Common Stock, nor (except for the
issuance of the KeySpan  Option) have any  transactions  in KeySpan Common Stock
been  effected  during  the past 60 days by LILCO or, to the best  knowledge  of
KeySpan,  by any executive  officer or director of LILCO. In addition,  no other
person is known by LILCO to have the right to receive or the power to direct the
receipt of dividends from, or


                               Page 6 of 15 Pages

<PAGE>

the proceeds from the sale of, the securities covered by this
Schedule 13D.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

         The following exhibits are filed as part of this Schedule 13D:

Exhibit 2.1 --      Joint Proxy  Statement of The Brooklyn Union Gas Company and
                    Long Island  Lighting  Company and  Prospectus of BL Holding
                    Corp. and KeySpan Energy  Corporation,  dated June 27, 1997,
                    included in the Registration  Statement on Form S-4 filed on
                    June 30, 1997, as amended by Post-Effective Amendment No. 1,
                    filed on July 3,  1997.  (Incorporated  herein by  reference
                    from  KeySpan  Energy  Corporation's  Form S-4  Registration
                    Statement No. 333-30407)

Exhibit 2.2 --      Amended and  Restated  Agreement  and Plan of  Exchange  and
                    Merger  between  The  Brooklyn  Union Gas  Company  and Long
                    Island   Lighting   Company  dated  as  of  June  26,  1997.
                    (Incorporated  herein by  reference  from Annex A of Exhibit
                    2.1 hereto)

Exhibit 2.3 --      Amended and Restated  LILCO Stock Option  Agreement  between
                    The  Brooklyn  Union Gas Company  and Long  Island  Lighting
                    Company dated as of June 26, 1997.  (Incorporated  herein by
                    reference from Annex B of Exhibit 2.2 hereto)

Exhibit 2.4 --      Amended and Restated  Brooklyn Union Stock Option  Agreement
                    between Long Island Lighting  Company and The Brooklyn Union
                    Gas Company dated as of June 26, 1997.  (Incorporated herein
                    by reference from Annex C of Exhibit 2.2 hereto)

Exhibit 2.5 --      Amendment,  Assignment and Assumption Agreement, dated as of
                    September 29, 1997 by and among  Brooklyn  Union,  LILCO and
                    KeySpan.


                               Page 7 of 15 Pages

<PAGE>

                                                                         ANNEX I

                        DIRECTORS AND EXECUTIVE OFFICERS

     Set  forth  below are the name and  present  principal  occupation  of each
director and executive officer of Long Island Lighting Company as of October 17,
1997.  The business  address of each such director and executive  officer is c/o
Long Island Lighting Company,  175 East Old Country Road,  Hicksville,  New York
11801.

NAME                                                      PRINCIPAL OCCUPATION

DIRECTORS
OF LILCO:


A. James Barnes                                     Dean,   Indiana   University
                                                    School   of    Public    and
                                                    Environmental Affairs

George Bugliarello                                  Chancellor,     Polytechnic
                                                    University

Renso L. Caporali                                   Senior  Vice   President  of
                                                    Engineering   and   Business
                                                    Development,        Raytheon
                                                    Company

Dr. William J. Catacosinos                          Chairman and Chief Executive
                                                    Officer,     Long     Island
                                                    Lighting Company

Peter O. Crisp                                      Chairman, Venrock, Inc.

James T. Flynn                                      President      and     Chief
                                                    Operating   Officer,    Long
                                                    Island Lighting Company

Vicki L. Fuller                                     Senior    Vice    President,
                                                    Alliance Capital  Management
                                                    Corporation

Katherine D. Ortega                                 Former   Treasurer   of  the
                                                    United States

Basil A. Paterson                                   Partner,  law firm of Meyer,
                                                    Suozzi,  English  and Klein,
                                                    P.C.

Richard L. Schmalensee                              Director,      Massachusetts
                                                    Institute   of    Technology
                                                    Center    for   Energy   and
                                                    Environmental         Policy
                                                    Research


                               Page 8 of 15 Pages

<PAGE>

George J. Sideris                                   Retired      Senior     Vice
                                                    President,    Long    Island
                                                    Lighting Company

John H. Talmage                                     Partner,  H.R. Talmage & Son
                                                    Farm


EXECUTIVE OFFICERS
OF LILCO
(WHO ARE NOT DIRECTORS):


Theodore A. Babcock                                 Vice      President      and
                                                    Treasurer,         Assistant
                                                    Corporate Secretary

Michael E. Bray                                     Senior    Vice    President,
                                                    Electric Business Unit

Charles A. Daverio                                  Vice    President,    Energy
                                                    Exchange Group

Jane A. Fernandez                                   Vice    President,     Human
                                                    Resources

Joseph E. Fontana                                   Vice      President      and
                                                    Controller

Robert  X.  Kelleher                                Senior Vice President, Human
                                                    Resources

Howard A. Kosel                                     Vice    President,    Fossil
                                                    Production

John D. Leonard, Jr.                                Vice   President,    Special
                                                    Projects

Adam M. Madsen                                      Senior    Vice    President,
                                                    Corporate     &    Strategic
                                                    Planning

Kathleen A. Marion                                  Vice  President,   Corporate
                                                    Services    and    Corporate
                                                    Secretary

Brian R. McCaffrey                                  Vice  President,
                                                    Communications

Joseph W. McDonnell                                 Senior    Vice    President,
                                                    Electric & Gas Marketing and
                                                    External Affairs

Leonard P. Novello                                  Senior  Vice  President  and
                                                    General Counsel

Anthony Nozzolillo                                  Senior    Vice    President,
                                                    Finance and Chief  Financial
                                                    Officer

Richard Reichler                                    Vice   President,   Tax  and
                                                    Benefits Planning and Deputy
                                                    General Counsel


                               Page 9 of 15 Pages

<PAGE>

William G. Schiffmacher                             Senior    Vice    President,
                                                    Customer    Relations    and
                                                    Information Systems

Werner J. Schweiger                                 Vice   President,   Electric
                                                    Operations

Richard M. Siegel                                   Vice President,  Information
                                                    Systems and Technology

Robert B. Steger                                    Senior Vice  President,  Gas
                                                    Business Unit

William E. Steiger, Jr.                             Vice  President,  Facilities
                                                    and Real Estate

Edward J. Youngling                                 Senior    Vice    President,
                                                    Engineering & Construction


                               Page 10 of 15 Pages

<PAGE>


                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

                               LONG ISLAND LIGHTING COMPANY



                                By: /s/ Anthony Nozzolillo
                                   -----------------------
                                     Name:  Anthony Nozzolillo
                                     Title: Senior Vice President, Finance
                                             and Chief Financial Officer

Dated:  October 24, 1997


                               Page 11 of 15 Pages

<PAGE>

                                  EXHIBIT INDEX


EXHIBIT           DESCRIPTION

2.1               Joint Proxy Statement of The Brooklyn Union Gas Company
                  and Long Island Lighting Company and Prospectus of BL
                  Holding Corp. and KeySpan Energy Corporation, dated
                  June 27, 1997, included in the Registration Statement
                  on Form S-4 filed on June 30, 1997, as amended by Post-
                  Effective Amendment No. 1, filed on July 3, 1997.
                  (Incorporated herein by reference from KeySpan Energy
                  Corporation's Form S-4 Registration Statement No. 333-
                  30407)

2.2               Amended and Restated Agreement and Plan of Exchange and
                  Merger between The Brooklyn Union Gas Company and Long
                  Island Lighting Company dated as of June 26, 1997.
                  (Incorporated herein by reference from Annex A of
                  Exhibit 2.1 hereto)

2.3               Amended and Restated LILCO Stock Option Agreement
                  between The Brooklyn Union Gas Company and Long Island
                  Lighting Company dated as of June 26, 1997.
                  (Incorporated herein by reference from Annex B of
                  Exhibit 2.2 hereto)

2.4               Amended and Restated Brooklyn Union Stock Option
                  Agreement between Long Island Lighting Company and The
                  Brooklyn Union Gas Company dated as of June 26, 1997.
                  (Incorporated herein by reference from Annex C of
                  Exhibit 2.2 hereto)

2.5               Amendment, Assignment and Assumption Agreement, dated
                  as of September 29, 1997 by and among Brooklyn Union,
                  LILCO and KeySpan.


                               Page 12 of 15 Pages




                                                                     Exhibit 2.5

                 AMENDMENT, ASSIGNMENT AND ASSUMPTION AGREEMENT


         This  AMENDMENT,  ASSIGNMENT  AND  ASSUMPTION  AGREEMENT,  dated  as of
September  29,  1997 (this  "AMENDMENT"),  by and among THE  BROOKLYN  UNION GAS
COMPANY,  a New  York  corporation  ("BROOKLYN  UNION"),  LONG  ISLAND  LIGHTING
COMPANY, a New York corporation ("LILCO"), and KEYSPAN ENERGY CORPORATION, a New
York corporation and, prior to the Effective Time (as defined herein),  a wholly
owned  subsidiary of Brooklyn Union  ("KEYSPAN"),  among other things amends the
following agreements:

         a.       the AMENDED AND  RESTATED  AGREEMENT  AND PLAN OF EXCHANGE AND
                  MERGER, dated as of June 26, 1997 (the "MERGER AGREEMENT"), by
                  and between Brooklyn Union and LILCO;

         b.       the AMENDED AND RESTATED BROOKLYN UNION STOCK OPTION
                  AGREEMENT, dated as of June 26, 1997 (the "BROOKLYN UNION
                  OPTION AGREEMENT"); and

         c.       the AMENDED AND RESTATED LILCO STOCK OPTION  AGREEMENT,  dated
                  as of  June  26,  1997  (the  "LILCO  OPTION  AGREEMENT",  and
                  together  with the Merger  Agreement  and the  Brooklyn  Union
                  Option Agreement, the "AGREEMENTS").


         WHEREAS,  Brooklyn  Union  and  LILCO  have  determined  to engage in a
business  combination as peer firms in a merger and a binding share exchange and
to form a holding  company to manage their combined  businesses  (the "COMPANY")
and have entered into the Agreements for such purpose; and

         WHEREAS,  contemporaneously  herewith,  KeySpan  is  acquiring  all the
outstanding  shares of common  stock,  par value $0.33 1/3 per share  ("BROOKLYN
UNION  COMMON  STOCK"),  of Brooklyn  Union in a binding  share  exchange  under
Section  913 of the New York  Business  Corporation  Law, in which each share of
Brooklyn  Union Common Stock will be exchanged  for one share of common stock of
KeySpan, par value $0.33 1/3 per share ("KEYSPAN COMMON STOCK"), with the result
that  Brooklyn  Union will become a wholly  owned  subsidiary  of KeySpan  (such
transaction, the "KEYSPAN RESTRUCTURING"); and

         WHEREAS,  pursuant to Section 10.7 of the Merger  Agreement the parties
desire to provide  for the  assignment  by Brooklyn  Union to  KeySpan,  and the
assumption by KeySpan,  of all of Brooklyn Union's rights and obligations  under
the  Agreements  and  to  substitute  KeySpan  for  Brooklyn  Union  thereunder,
effective upon the effective time of the KeySpan  Restructuring  (the "EFFECTIVE
TIME").


                               Page 13 of 15 Pages

<PAGE>

         NOW   THEREFORE,   in   consideration   of   the   premises   and   the
representations,  warranties,  covenants and agreements  contained  herein,  the
parties hereto, intending to be legally bound hereby, agree as follows:


         Section i. Definitions. Capitalized terms used herein and not otherwise
defined herein have the respective meanings given in the Merger Agreement.

         Section ii.  Assumption  of  Liabilities  and  Obligations  by KeySpan.
KeySpan agrees to assume,  effective as of the Effective  Time, all  liabilities
and  obligations  of  Brooklyn  Union under each of the  Agreements,  including,
without limitation,  the obligation under the Brooklyn Union Option Agreement to
issue  shares of  KeySpan  Common  Stock in certain  circumstances  as set forth
therein.

         Section iii.  Substitution of KeySpan for Brooklyn  Union.  (a) Each of
the Agreements is hereby amended,  effective as of the Effective Time, such that
KeySpan is substituted  for Brooklyn Union for all purposes under the Agreements
and all references to Brooklyn Union in the Agreements  shall be deemed to refer
to KeySpan, except as provided in paragraph (c) below and except for purposes of
or references in Article IV,  Section 7.2,  Section 7.4, and Section 7.6 and the
reference to Brooklyn Union in Section 7.1 of the Merger Agreement.

                  (b) Each of the Agreements is hereby amended,  effective as of
the  Effective  Time,  such that  Subsidiaries  of KeySpan are  substituted  for
Brooklyn  Union  Subsidiaries  for all  purposes  under the  Agreements  and all
references to Brooklyn Union  Subsidiaries in the Agreements  shall be deemed to
refer to Subsidiaries of KeySpan,  except as provided in paragraph (c) below and
except for purposes of or references in Article IV of the Merger Agreement.

                  (c) Section  8.2(b) of the Merger  Agreement is hereby amended
and restated to read in its entirety as follows:

                         "(b)     REPRESENTATIONS     AND    WARRANTIES.     The
                    representations  and  warranties of Brooklyn Union set forth
                    in  this  Agreement  and the  Brooklyn  Union  Stock  Option
                    Agreement  shall  be  true  and  correct  (i)  on  and as of
                    December   29,   1996   except   for   such    failures   of
                    representations   or  warranties  to  be  true  and  correct
                    (without regard to any materiality  qualifications contained
                    therein) which, individually or in the aggregate,  would not
                    be reasonably  likely to result in a Brooklyn Union Material
                    Adverse  Effect and (ii) on and as of the Closing  Date with
                    the  same   effect  as  though  such   representations   and
                    warranties had been made with respect to KeySpan  instead of
                    Brooklyn  Union or with respect to  Subsidiaries  of KeySpan
                    instead of Brooklyn Union Subsidiaries,  as the case may be,
                    on and as of the Closing  Date  (except for  representations
                    and warranties  that  expressly  speak only as of a specific
                    date or time other than  December  29,  1996 or the  Closing
                    Date which need only be true and  correct as of such date or
                    time)  except  for  such  failures  of   representations  or
                    warranties to be true and correct (without regard


                               Page 14 of 15 Pages

<PAGE>

                    to any materiality  qualifications contained therein) which,
                    individually  or in the  aggregate,  would not be reasonably
                    likely  to  result  in a  material  adverse  effect  on  the
                    business, assets, financial condition, results of operations
                    or  prospects  of KeySpan  and its  subsidiaries  taken as a
                    whole."

         Section iv.  Substitution  of KeySpan  Common Stock for Brooklyn  Union
Common  Stock.  Each of the  Agreements is hereby  amended,  effective as of the
Effective Time, such that KeySpan Common Stock is substituted for Brooklyn Union
Common  Stock  for all  purposes  under the  Agreements  and all  references  to
Brooklyn  Union  Common  Stock in the  Agreements  shall be  deemed  to refer to
KeySpan Common Stock, except for purposes of Article IV of the Merger Agreement.

         Section v. Acknowledgment of KeySpan Assumption and Substitution. LILCO
hereby  acknowledges and confirms that,  effective as of the Effective Time, all
of the liabilities, obligations, benefits and rights of Brooklyn Union under the
Agreements shall inure to the benefit of KeySpan under those Agreements.

         Section vi. Counterparts. This Amendment may be executed in one or more
counter-  parts,  each of which  shall be deemed to be an  original,  but all of
which shall constitute one and the same agreement.

         IN WITNESS WHEREOF,  Brooklyn Union, LILCO and KeySpan have caused this
Amendment to be signed by their respective officers thereunto duly authorized as
of the date first written above.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective duly authorized officers as of the date first above
written.

                                  THE BROOKLYN UNION GAS COMPANY


                                  By: /s/ Robert B. Catell
                                     ------------------------
                                     Robert B. Catell
                                     Chief Executive Officer

                                  LONG ISLAND LIGHTING COMPANY


                                  By: /s/ William J. Catacosinos
                                      --------------------------
                                       Dr. William J. Catacosinos
                                       Chief Executive Officer


                                  KEYSPAN ENERGY CORPORATION


                                  By:  /s/ Robert B. Catell
                                       --------------------
                                       Robert B. Catell
                                       Chief Executive Officer


                               Page 15 of 15 Pages



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