MARKETSPAN CORP
8-K, 1999-03-30
NATURAL GAS DISTRIBUTION
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                       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


                         March 30, 1999 (March 30, 1999)
                Date of report (Date of earliest event reported)


                             MARKETSPAN CORPORATION
             (Exact name of registrant as specified in its charter)



         New York                   1-14161                  11-3431358
(State or other jurisdiction      (Commission            (I.R.S. Employer
      of incorporation)            File Number)          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)


Registrant's telephone number, including area code:  (516) 755-6650 (Hicksville)
                                                     (718) 403-1000 (Brooklyn)


<PAGE>

Item 5.  Other Events

              Rights  Agreement.  On March 30,  1999,  the Board of Directors of
MarketSpan  Corporation,  doing  business  as KeySpan  Energy  (the  "Company"),
declared  a dividend  distribution  of one Right for each  outstanding  share of
common stock,  par value $.01 per share,  of the Company (the "Common Stock") to
shareholders  of record at the close of business on April 14, 1999 (the  "Record
Date").  Each Right entitles the registered  holder to purchase from the Company
one  one-hundredth  of a share of a series of cumulative  preferred stock of the
Company designated Series D Preferred Stock (the "Preferred  Stock"), at a price
of $95.00 (the "Purchase  Price"),  subject to adjustment.  The  description and
terms of the Rights are set forth in a Rights Agreement (the "Rights Agreement")
by and  between  the  Company  and The Bank of New York,  as Rights  Agent  (the
"Rights Agent"),  which is filed as Exhibit 4 hereto and is incorporated  herein
by reference.

              Until the Distribution  Date (or earlier  redemption or expiration
of the  Rights),  which is defined  below,  the Rights will be  evidenced,  with
respect  to  any of the  Common  Stock  certificates  outstanding  prior  to the
Distribution  Date, by such Common Stock  certificates.  Until the  Distribution
Date, (or earlier  redemption or expiration of the Rights),  (i) the Rights will
be  transferred  with and only with the  Common  Stock,  (ii) new  Common  Stock
certificates  issued  after the Record Date upon  transfer,  replacement  or new
issuance  of Common  Stock  will be deemed to be  issued  with  Rights  and will
contain a notation incorporating the Rights Agreement by reference and (iii) the
surrender for transfer of any  certificate for Common Stock will also constitute
the transfer of the Rights  associated with the Common Stock represented by such
certificate.

              As soon as practicable  following the Distribution Date,  separate
certificates  evidencing the Rights  ("Rights  Certificates")  will be mailed to
holders  of  record  of the  Common  Stock as of the  close of  business  on the
Distribution  Date. From and after the  Distribution  Date, such separate Rights
Certificates alone will evidence the Rights.  Except as otherwise  determined by
the Board of Directors,  and except in connection  with the exercise of employee
stock  options,  any other  issuance  of Common  Stock  with  respect  to awards
outstanding  under employee benefit plans  outstanding on the Distribution  Date
and in connection  with the  conversion of convertible  securities  issued after
March 30, 1999, only Common Stock issued prior to the Distribution  Date will be
issued with Rights.

              "Distribution  Date"  shall  mean the  earlier  to occur of (i) 10
business  days  following  the  date of a  public  announcement  that a  person,
together with persons affiliated or associated with it, has acquired  beneficial
ownership  of 20% or more of the  outstanding  Common  Stock or (ii) 10 business
days  following  the  earlier  of  the  commencement  of,  or the  first  public
announcement  of the intent to commence,  a tender offer or exchange  offer by a
person other than the Company if, upon  consummation of the offer,  such person,
together with persons  affiliated or associated with it, would be the beneficial
owner  of 20% or  more of the  outstanding  Common  Stock.  The  Rights  are not
exercisable until the Distribution  Date. The Rights will expire at the close of
business  on March 30,  2009  (the  "Final  Expiration  Date"),  unless  earlier
redeemed or exchanged by the Company as described below.

                                      

<PAGE>

              The Purchase Price payable and the number of and kind of shares of
Preferred  Stock or other  securities or property  issuable upon exercise of the
Rights are subject to  adjustment  from time to time to prevent  dilution (i) in
the  event  of  a  stock   dividend  on,  or  a   subdivision,   combination  or
reclassification  of, the Preferred Stock, (ii) upon the grant to holders of the
Preferred  Stock of  certain  rights,  options  or  warrants  to  subscribe  for
Preferred Stock (or shares having the same rights, privileges and preferences as
the shares of  Preferred  Stock) at less than the  current  market  price of the
Preferred Stock or (iii) upon the distribution to holders of the Preferred Stock
of evidences of  indebtedness,  securities,  cash or assets  (excluding  regular
periodic  dividends  out of earnings or retained  earnings)  or of  subscription
rights  or  warrants  (other  than  those  referred  to  above).   With  certain
exceptions,  no  adjustment  in  the  Purchase  Price  will  be  required  until
cumulative  adjustments  require an  adjustment  of at least 1% in the  Purchase
Price. No fractional  shares of Preferred Stock will be issued upon the exercise
of any Right or Rights (other than fractions which are integral multiples of one
one-hundredth of a share of Preferred Stock),  and in lieu thereof an adjustment
in cash will be made based on the current market price of the Preferred Stock on
the last trading day prior to the date of exercise.

               Any of the events  described in the succeeding  second and fourth
paragraphs are defined as a "Triggering Event."

              "Acquiring  Person"  shall  mean any  person  who  constitutes  an
"Interested  Shareholder"  as defined in  Section  912 of the New York  Business
Corporation Law, in effect from time to time,  (generally defined to include any
person who or which, together with all persons affiliated or associated with it,
shall be the beneficial  owner of 20% or more of the shares of Common Stock then
outstanding),  but shall not include the Company, any subsidiary of the Company,
any employee benefit plan of the Company or of any subsidiary of the Company, or
any person or entity  organized,  appointed  or  established  by the  Company or
pursuant to the terms of any such plan.

              In the event that a person,  together  with persons  affiliated or
associated  with  it,  becomes  an  Acquiring  Person  (except  as a  result  of
repurchases  of  stock  by  the  Company  or  certain   inadvertent  actions  by
institutional or certain other shareholders),  proper provision shall be made so
that each holder of a Right, except as provided below, shall thereafter have the
right  to  receive,  upon  exercise  thereof,   Common  Stock  (or,  in  certain
circumstances  as determined by the Company,  other  securities,  cash, or other
property) having a value of two times the Purchase Price. Notwithstanding any of
the  foregoing,  following  the  occurrence  of the  event  set  forth  in  this
paragraph, all Rights that are, or (under certain circumstances set forth in the
Rights  Agreement)  were,  beneficially  owned by any  Acquiring  Person  (or by
certain related parties and transferees)  will be null and void.  Rights are not
exercisable  following  the  occurrence  of the event set forth above until such
time as the Rights are no longer redeemable by the Company, as set forth below.

              For example,  at an exercise price of $95.00 per Right, each Right
not owned by an Acquiring Person (or by certain related parties and transferees)
following an event set forth in the preceding paragraph would entitle its holder
to purchase  $190.00  worth of Common  Stock (or other  consideration,  as noted
above)  for  $95.00.  Assuming  that the Common  Stock had a per share  value of
$47.50 at such  time,  the  holder of each  valid  Right  would be  entitled  to
purchase 4 shares of Common Stock for $95.00.

                                       2

<PAGE>

              In the event that,  at any time  following  the Stock  Acquisition
Date,  which is defined below,  (i) the Company is acquired in a merger or other
business  combination  transaction  in which the  Company  is not the  surviving
corporation  (other than a merger which follows an offer described in the second
preceding  paragraph),  or (ii)  fifty  percent  (50%) or more of the  Company's
assets,  cash flow or earning  power is sold or  transferred,  proper  provision
shall be made so that each holder of a Right (other than Rights that theretofore
become  null and void as  described  in the second  preceding  paragraph)  shall
thereafter have the right to receive, upon exercise thereof, common stock of the
acquiring  company  having a value equal to two times the exercise  price of the
Right.

              At any time until the close of business on the tenth  business day
following  the  date of a  public  announcement  that a  person  has  become  an
Acquiring Person (the "Stock Acquisition Date"), the Company may redeem all, but
not less than all, the then outstanding Rights at a redemption price of $.01 per
Right  (the  "Redemption  Price").  Immediately  upon the action of the Board of
Directors  of the Company  ordering  redemption  of the Rights,  the Rights will
terminate  and the only  right of the holder of Rights  will be to  receive  the
Redemption Price.

              At any  time  after  the  acquisition  by a  person  or  group  of
affiliated or associated  persons of beneficial  ownership of 20% or more of the
outstanding  shares of Common Stock and prior to the  acquisition by such person
or group of 50% or more of the outstanding  shares of Common Stock, the Board of
Directors  may  exchange  the Rights  (other than Rights owned by such person or
group which have become void),  in whole or in part, at an exchange ratio of one
share of Common Stock, or one one-hundredth of a share of Preferred Stock (or of
a share of a class or series of the Company's  preferred stock having equivalent
rights, preferences and privileges), per Right (subject to adjustment).

              Any of the  provisions  of the Rights  Agreement may be amended by
the  Board  of  Directors  of  the  Company  prior  to  the  Distribution  Date.
Thereafter,  the provisions of the Rights  Agreement may be amended by the Board
of Directors of the Company in order to (i) cure any ambiguity,  (ii) shorten or
lengthen any time period under the Rights Agreement,  or (iii) make changes that
will not adversely affect the interests of the holders of Rights;  provided such
lengthening is for the purpose of protecting, enhancing or clarifying the rights
of, and/or the benefits to, the holders of Rights, and further;  provided,  that
no amendment may be made at such time as the Rights are not redeemable.

              Until a Right is exercised, the holder thereof, as such, will have
no rights as a shareholder of the Company,  including,  without limitation,  the
right to vote or to receive dividends. While the distribution of the Rights will
not be taxable to shareholders or to the Company, shareholders may, depending on
the circumstances,  recognize taxable income in the event that the Rights become
exercisable  for Common  Stock (or other  consideration)  of the  Company or for
common stock of the acquiring company as set forth above.

              The Rights have  certain  anti-takeover  effects.  The Rights will
cause  substantial  dilution  to a person or group that  attempts to acquire the
Company  without  conditioning  the offer on  redemption  of the  Rights or on a
substantial  number of Rights being  acquired.  The Rights  should not interfere
with any merger or other business combination approved by the Board of Directors
of the  Company  prior  to the time  that the  Rights  may not be  redeemed  (as
described  above) since the Board of Directors  may, at its option,  at any time

                                       3

<PAGE>

until such date redeem all but not less than all of the then outstanding Rights.
The Rights  are  designed  to  provide  additional  protection  against  abusive
takeover tactics such as offers for all shares at less than full value,  partial
tender offers and selective  open-market  purchases.  The Rights are intended to
assure  that the  Company's  Board  of  Directors  has the  ability  to  protect
stockholders  and the Company if efforts are made to gain control of the Company
in a  manner  that  is  not  in the  best  interests  of  the  Company  and  its
stockholders.

              The  foregoing  description  of the Rights  does not purport to be
complete and is qualified in its entirety by reference to the Rights Agreement.

                                       4

<PAGE>

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

(c)   Exhibits

              (i)          Rights  Agreement,  dated  March  30,  1999,  by  and
                           between  MarketSpan  Corporation,  doing  business as
                           KeySpan  Energy,  and The Bank of New York, as Rights
                           Agent.  The Rights  Agreement  includes  as Exhibit A
                           thereto  the   Certificate   of   Amendment   to  the
                           Certificate  of   Incorporation   for  the  Series  D
                           Preferred  Stock,  as  Exhibit B thereto  the Form of
                           Rights  Certificate  and as  Exhibit  C  thereto  the
                           Summary  of Rights  to  Purchase  Series D  Preferred
                           Stock.

              (ii)         Press Release, dated March 30, 1999.


                                       5

<PAGE>


                                   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, thereunto duly authorized.

                                   MARKETSPAN CORPORATION



Dated:  March 30, 1999             By: /s/ Craig G. Matthews
                                       ---------------------
                                       Craig G. Matthews
                                       President and Chief Operating Officer


                                       6
<PAGE>

                               INDEX TO EXHIBITS


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

      4              Rights  Agreement,  dated  March 30,  1999,  by and between
                     MarketSpan  Corporation,  doing business as KeySpan Energy,
                     and The Bank of New  York,  as  Rights  Agent.  The  Rights
                     Agreement  includes as Exhibit A thereto the Certificate of
                     Amendment  to the  Certificate  of  Incorporation  for  the
                     Series D Preferred  Stock, as Exhibit B thereto the Form of
                     Rights  Certificate and as Exhibit C thereto the Summary of
                     Rights to Purchase Series D Preferred Stock.


      99             Press Release, dated March 30, 1999.





                                       7












                                RIGHTS AGREEMENT

                                 by and between


                             MARKETSPAN CORPORATION



                                       and



                              THE BANK OF NEW YORK,
                                  Rights Agent





                              Dated March 30, 1999





<PAGE>


<TABLE>
<CAPTION>

                                TABLE OF CONTENTS
                                                                                                                    Page

<S>               <C>
Section 1.        Certain Definitions................................................................................1
Section 2.        Appointment of Rights Agent........................................................................5
Section 3.        Issuance of Rights Certificates....................................................................5
Section 4.        Form of Rights Certificates........................................................................7
Section 5.        Countersignature and Registration..................................................................8
Section 6.        Transfer, Split Up, Combination and Exchange of Rights Certificates;
                  Mutilated, Destroyed, Lost or Stolen Rights Certificates...........................................8
Section 7.        Exercise of Rights; Purchase Price; Expiration Date of Rights......................................9
Section 8.        Cancellation of Rights Certificates................................................................11
Section 9.        Reservation and Availability of Capital Stock......................................................11
Section 10.       Preferred Stock Record Date........................................................................12
Section 11.       Adjustment of Purchase Price, Number and Kind of Shares
                  or Number of Rights................................................................................13
Section 12.       Certificate of Adjusted Purchase Price or Number of Shares.........................................19
Section 13.       Consolidation, Merger or Sale or Transfer of Assets, Cash Flow
                  or Earning Power...................................................................................20
Section 14.       Fractional Rights and Fractional Shares............................................................22
Section 15.       Rights of Action...................................................................................23
Section 16.       Agreement of Rights Holders........................................................................23
Section 17.       Rights Certificate Holder Not Deemed a Shareholder.................................................24
Section 18.       Concerning the Rights Agent........................................................................24
Section 19.       Merger or Consolidation or Change of Name of Rights Agent..........................................25
Section 20.       Duties of Rights Agent.............................................................................25
Section 21.       Change of Rights Agent.............................................................................28
Section 22.       Issuance of New Rights Certificates................................................................28
Section 23.       Redemption and Termination.........................................................................29
Section 24.       Exchange...........................................................................................30
Section 25.       Notice of Certain Events...........................................................................31
Section 26.       Notices............................................................................................31
Section 27.       Supplements and Amendments.........................................................................32
Section 28.       Successors.........................................................................................33
Section 29.       Determinations and Actions by the Board of Directors, etc..........................................33
Section 30.       Benefits of this Agreement.........................................................................33
Section 31.       Severability.......................................................................................33
Section 32.       Governing Law......................................................................................34
Section 33.       Counterparts.......................................................................................34
Section 34.       Descriptive Headings...............................................................................34

</TABLE>

                                        i

<PAGE>

                                RIGHTS AGREEMENT


              RIGHTS AGREEMENT,  dated March 30, 1999 (the "Agreement"),  by and
between MARKETSPAN CORPORATION, a New York corporation doing business as KeySpan
Energy (the "Company"), and THE BANK OF NEW YORK, a New York banking corporation
(the "Rights Agent").

                               W I T N E S S E T H

              WHEREAS,  on March 30,  1999  (the  "Rights  Dividend  Declaration
Date"), the Board of Directors of the Company authorized and declared a dividend
distribution  of one Right (as  hereinafter  defined)  for each  share of Common
Stock (as hereinafter defined) outstanding at the close of business on April 14,
1999 (the "Record Date"),  and has authorized the issuance of one Right (as such
number may  hereinafter be adjusted  pursuant to the provisions of Section 11(p)
hereof) for each share of Common Stock issued  (whether as an original  issuance
or from the  Company's  treasury)  between the Record Date and the  Distribution
Date (as  hereinafter  defined)  and in  certain  other  circumstances  provided
herein,   each  Right   initially   representing   the  right  to  purchase  one
one-hundredth  of a share of Preferred Stock (as  hereinafter  defined) upon the
terms and subject to the conditions hereinafter set forth (the "Rights");

              NOW,  THEREFORE,  in  consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

              Section 1.  Certain Definitions.

              For  purposes  of this  Agreement,  the  following  terms have the
meanings  indicated:  

              (a)  "Acquiring  Person" shall mean any Person who  constitutes an
"Interested  Shareholder"  as defined in  Section  912 of the New York  Business
Corporation  Law,  in  effect  from time to time  (the  "NYBCL"),  but shall not
include (i) the Company, (ii) any Subsidiary of the Company,  (iii) any employee
benefit plan of the Company or of any Subsidiary of the Company, (iv) any Person
or entity organized,  appointed or established by the Company for or pursuant to
the  terms  of any  such  plan,  (v)  any  Person  who  becomes  an  "Interested
Shareholder"  as a result of a reduction in the number of shares of Common Stock
outstanding due to the repurchase of shares of Common Stock from time to time by
the Company unless and until such Person,  after becoming aware that such Person
has  become  an  "Interested   Shareholder"  acquires  beneficial  ownership  of
additional  shares of Common Stock  representing one percent (1%) or more of the
shares of Common Stock then outstanding or (vi) any such Person who has reported
or is required to report such  ownership  on Schedule  13G under the  Securities
Exchange Act of 1934, as amended from time to time (the "Exchange  Act") (or any
comparable  or  successor  report) or on Schedule 13D under the Exchange Act (or
any  comparable  or  successor  report)  which  Schedule  13D does not state any
intention  to or reserve the right to control or  influence  the  management  or
policies of the Company or engage in any of the actions  specified in Item 4 (or
any comparable or successor  Item) of such Schedule  (other than the disposition
of the Common Stock) and,  within ten (10)  Business Days of being  requested by
the Company to advise it regarding the same,  certifies to the Company that such
Person  acquired  shares  of  Common  Stock  causing  such  


<PAGE>

Person to become an "Interested Shareholder"  inadvertently or without knowledge
of the terms of the Rights and who, together with all Affiliates and Associates,
thereafter does not acquire  additional shares of Common Stock while such Person
is an "Interested Shareholder";  provided, however, that if the Person requested
to so certify  fails to do so within ten (10)  Business  Days,  then such Person
shall become an Acquiring  Person  immediately  after such ten (10) Business Day
period;  provided,  further,  however,  that for purposes of determining whether
such  Person is an  "Acquiring  Person,"  a Person  engaged  in  business  as an
underwriter  of  securities  shall not be deemed to be an Acquiring  Person as a
result of such Person becoming the "Beneficial Owner" of any securities acquired
through  such  Person's  participation  in  good  faith  in  a  firm  commitment
underwriting  unless such Person is the  "Beneficial  Owner" of such  securities
upon the expiration of forty (40) days after the date of such acquisition.

              (b)  "Adjustment  Shares"  shall  have the  meaning  specified  in
Section 11(a)(ii) hereof.

              (c) "Affiliate" and "Associate" shall have the respective meanings
ascribed to such terms in Section 912 of the NYBCL.

              (d) A Person shall be deemed the "Beneficial  Owner" of, and shall
be deemed to "beneficially own," any securities if such Person constitutes, with
respect to such  securities,  a "Beneficial  Owner" as defined in Section 912 of
the NYBCL; provided, however, that for purposes of this Agreement (including for
purposes  of  determining   whether  a  Person  will  be  deemed  an  Interested
Shareholder  under Section 912 of the NYBCL), a Person engaged in business as an
underwriter of securities  shall not be deemed to be the "Beneficial  Owner" of,
or to  "beneficially  own," (A) any  securities  acquired  through such Person's
participation  in  good  faith  in a  firm  commitment  underwriting  until  the
expiration of forty (40) days after the date of such acquisition, (B) securities
issuable  upon  exercise  of Rights  at any time  prior to the  occurrence  of a
Triggering  Event or (C)  securities  issuable  upon exercise of Rights from and
after the  occurrence  of a Triggering  Event which Rights were acquired by such
Person  or  any  of  such  Person's   Affiliates  or  Associates  prior  to  the
Distribution  Date or  pursuant  to  Section  3(a) or  Section  22  hereof  (the
"Original  Rights") or pursuant to Section  11(i) hereof in  connection  with an
adjustment made with respect to any Original Rights. 

              (e)  "Business  Day"  shall  mean any day other  than a  Saturday,
Sunday  or a day on  which  banking  institutions  in the  State of New York are
authorized or obligated by law or executive order to close.

              (f)  "Close of  Business"  on any given date shall mean 5:00 P.M.,
New York City time, on such date; provided,  however, that if such date is not a
Business Day it shall mean 5:00 P.M., New York City time, on the next succeeding
Business Day.

              (g)  "Closing  Price"  shall mean for each day the last sale price
or, in case no such sale takes place on such day, the average of the closing bid
and asked  prices,  in either  case as reported  in the  principal  consolidated
transaction  reporting  system with respect to securities  listed or admitted to
trading on the New York Stock Exchange or, if the securities in question are not
listed or admitted to trading on the New York Stock Exchange, as reported in the
principal  consolidated  transaction reporting system with respect to securities
listed on the principal national  securities exchange on which the securities in
question are listed or 

                                       2

<PAGE>

admitted to trading or, if the securities in question are not listed or admitted
to trading on any national securities exchange, the last quoted price or, if not
so  quoted,   the  average  of  the  high  bid  and  low  asked  prices  in  the
over-the-counter  market, as reported by the National  Association of Securities
Dealers, Inc. Automated Quotation System ("NASDAQ") or such other system then in
use,  or, if on any such date the  securities  in question are not quoted by any
such organization,  the average of the closing bid and asked prices as furnished
by a professional market maker selected by the Board of Directors of the Company
and making a market in the securities in question. If on any such date no market
maker is making a market in the  securities in question,  the fair value of such
securities on such date as determined in good faith by the Board of Directors of
the Company shall be used.  If the  securities in question are not publicly held
or not so listed or traded, "current market price" per share shall mean the fair
value per share as  determined  in good faith by the Board of  Directors  of the
Company,  whose  determination  shall be described in a statement filed with the
Rights Agent and shall be conclusive for all purposes.

              (h) "Common Stock" shall mean the common stock, par value $.01 per
share,  of the Company,  except that "Common  Stock" when used with reference to
any Person  other than the Company  shall mean the capital  stock of such Person
with the  greatest  voting  power,  or the  equity  securities  or other  equity
interest  having power to control or direct the  management  of such  Person.  

              (i) "Common stock equivalents" shall have the meaning specified in
Section 11(a)(iii) hereof.

              (j)  "Current  Value"  shall have the meaning set forth in Section
11(a)(iii) hereof.

              (k) "Distribution Date" shall mean the earlier of (i) the close of
business  on the  tenth  Business  Day  after the  Stock  Acquisition  Date,  as
hereinafter  defined (or, if the tenth Business Day after the Stock  Acquisition
Date occurs  before the Record Date,  the close of business on the Record Date),
or (ii) the close of  business on the tenth  Business  Day (or such later day as
may be determined by the Board of Directors)  after the date of the commencement
of, or the first public  announcement  of the intent to commence (as  determined
pursuant  to Rule  14d-2(a)  of the  General  Rules  and  Regulations  under the
Exchange  Act in effect  on the date of this  Agreement),  a tender or  exchange
offer by any Person (other than the Company,  any Subsidiary of the Company, any
employee  benefit plan of the Company or of any Subsidiary of the Company or any
Person or entity  organized,  appointed or established by or for the Company for
or pursuant to the terms of any such plan), if upon consummation  thereof,  such
Person would be an Acquiring Person  (including any such date which is after the
date of this Agreement and prior to the issuance of the Rights).

              (l) "Expiration  Date" shall mean the earliest of (i) the close of
business on the tenth  anniversary  of the Record  Date (the  "Final  Expiration
Date"), (ii) the time at which the Rights are redeemed as provided in Section 23
hereof or (iii) the time at which the Rights are  exchanged  pursuant to Section
24 hereof.

              (m)  "Person"  shall  mean  any  individual,   firm,  corporation,
partnership  or other  entity,  and shall  include any  successor  (by merger or
otherwise) of such entity.

                                       3

<PAGE>

              (n)  "Preferred  Stock"  shall mean  shares of Series D  Preferred
Stock,  par value $.01 per share,  of the Company having the rights,  powers and
preferences set forth in the form of Certificate of Amendment of the Certificate
of  Incorporation of the Company attached hereto as Exhibit A and, to the extent
necessary to permit the full exercise of the then outstanding  Rights, any other
series of Preferred Stock of the Company designated by the Board of Directors of
the Company for such  purposes  containing  terms  substantially  similar to the
Series D Preferred Stock.

              (o) "Principal  Party" shall have the meaning specified in Section
13(b) hereof.

              (p) "Purchase  Price" shall have the meaning  specified in Section
4(a) and Section 7(b) hereof, as modified by Section 11(a)(ii) and Section 13(a)
hereof.

              (q) "Redemption Price" shall have the meaning specified in Section
23(a) hereof.

              (r)  "Rights  Certificates"  shall have the meaning  specified  in
Section 3(a) hereof.

              (s) "Securities  Act" shall have the meaning  specified in Section
9(c) hereof.

              (t) "Section  11(a)(ii)  Event" shall mean any event  described in
Section 11(a)(ii) hereof.

              (u)  "Section  11(a)(ii)  Trigger  Date"  shall  have the  meaning
specified in Section 11(a)(iii) hereof.

              (v) "Section 13 Event"  shall mean any event  described in clauses
(x), (y) or (z) of Section 13(a) hereof.

              (w)  "Spread"   shall  have  the  meaning   specified  in  Section
11(a)(iii) hereof.

              (x) "Stock  Acquisition  Date" shall mean the first date of public
announcement  (which,  for purposes of this definition,  shall include,  without
limitation,  a report  filed or  amended  pursuant  to Section  13(d)  under the
Exchange Act) by the Company or an Acquiring Person that an Acquiring Person has
become such.

              (y)  "Subsidiary"  shall mean,  with reference to any Person,  any
corporation of which an amount of voting securities sufficient to elect at least
a majority of the directors of such corporation is beneficially owned,  directly
or indirectly,  by such Person or any corporation  otherwise  controlled by such
Person.  

              (z)  "Substitution  Period"  shall have the meaning  specified  in
Section 11(a)(iii) hereof.

              (aa)  "Summary  of Rights"  shall have the  meaning  specified  in
Section 3(b) hereof.

                                       4

<PAGE>

              (bb)  "Trading  Day"  shall  mean a day  on  which  the  principal
national  securities  exchange on which the securities in question are listed or
admitted  to  trading  is open  for the  transaction  of  business  or,  if such
securities  are not listed or  admitted  to trading on any  national  securities
exchange, a Business Day.

              (cc) "Triggering  Event" shall mean any Section 11(a)(ii) Event or
any Section 13 Event. 

              Section 2.  Appointment of Rights Agent.

              The Company  hereby  appoints the Rights Agent to act as agent for
the Company in accordance with the terms and conditions  hereof,  and the Rights
Agent hereby accepts such appointment. The Company may from time to time appoint
such co-Rights Agents as it may deem necessary or desirable, upon ten days prior
written  notice to the  Rights  Agent.  The Rights  Agent  shall have no duty to
supervise,  and shall in no event be liable for,  the acts or  omissions  of any
such  co-Rights  Agent. 

              Section 3.  Issuance of Rights Certificates.  

              (a) Until the  Distribution  Date, the Rights will be evidenced by
the  certificates for the Common Stock registered in the names of the holders of
the Common Stock (which certificates for Common Stock shall be deemed also to be
certificates for Rights) and not by separate  certificates,  and the Rights will
be  transferred  with and only with the  transfer  of the  underlying  shares of
Common Stock  (including a transfer to the Company).  The Company shall give the
Rights  Agent  prompt  written  notice  of the  Distribution  Date.  As  soon as
practicable  after the  Distribution  Date, and receipt of written notice of the
Distribution  Date from the  Company,  the Rights Agent will,  at the  Company's
expense,  send by first-class  mail,  insured,  postage prepaid,  to each record
holder of the Common Stock as of the close of business on the Distribution Date,
at the address of such holder shown on the records of the  Company,  one or more
rights certificates,  in substantially the form of Exhibit B hereto (the "Rights
Certificates"),  evidencing  one Right for each  share of Common  Stock so held,
subject to adjustment as provided herein. In the event that an adjustment in the
number of Rights  per share of Common  Stock has been made  pursuant  to Section
11(p)  hereof,  at the time of  distribution  of the  Rights  Certificates,  the
Company  shall make the  necessary  and  appropriate  rounding  adjustments  (in
accordance with Section 14(a) hereof) so that Rights  Certificates  representing
only whole  numbers of Rights are  distributed,  and cash is paid in lieu of any
fractional  Rights.  As of and after the  Distribution  Date, the Rights will be
evidenced solely by such Rights Certificates.

              (b) As promptly as  practicable  following  the Record  Date,  the
Company will send or otherwise make available a copy of a summary of rights,  in
substantially  the form attached  hereto as Exhibit C (the "Summary of Rights"),
by first-class, postage pre-paid mail, to each record holder of the Common Stock
as of the Close of  Business on the Record  Date,  at the address of such holder
shown on the records of the Company. With respect to certificates for the Common
Stock outstanding as of the Record Date or issued subsequent to the Record Date,
until the Distribution  Date, the Rights will be evidenced by such  certificates
for the Common Stock and the  registered  holders of the Common Stock shall also
be the  registered  holders of the associated  Rights.  Until the earlier of the
Distribution  Date or the  Expiration  Date,  the  transfer of any  certificates
representing  shares of Common Stock in

                                       5

<PAGE>

respect of which Rights have been issued shall also  constitute  the transfer of
the Rights associated with such shares of Common Stock.

              (c)  Subject  to  Section  22  hereof,  Rights  shall be issued in
respect of all shares of Common Stock which are  outstanding  on the Record Date
and which are issued (whether  originally issued or from the Company's treasury)
after the Record Date but prior to the earlier of the  Distribution  Date or the
Expiration  Date.  Certificates  representing  such shares of Common Stock shall
also be deemed to be  certificates  for  Rights,  and shall  bear the  following
legend:

              THIS  CERTIFICATE ALSO EVIDENCES AND ENTITLES THE HOLDER HEREOF TO
              CERTAIN RIGHTS AS SET FORTH IN THE RIGHTS  AGREEMENT,  DATED MARCH
              30, 1999, BY AND BETWEEN MARKETSPAN CORPORATION, DOING BUSINESS AS
              KEYSPAN  ENERGY (THE  "COMPANY")  AND THE RIGHTS AGENT  THEREUNDER
              (THE   "RIGHTS   AGREEMENT"),   THE  TERMS  OF  WHICH  ARE  HEREBY
              INCORPORATED HEREIN BY REFERENCE AND A COPY OF WHICH IS ON FILE AT
              THE PRINCIPAL OFFICES OF THE COMPANY. UNDER CERTAIN CIRCUMSTANCES,
              AS  SET  FORTH  IN THE  RIGHTS  AGREEMENT,  SUCH  RIGHTS  WILL  BE
              EVIDENCED BY SEPARATE CERTIFICATES AND WILL NO LONGER BE EVIDENCED
              BY THIS  CERTIFICATE.  THE COMPANY WILL MAIL TO THE HOLDER OF THIS
              CERTIFICATE  A COPY OF THE RIGHTS  AGREEMENT,  AS IN EFFECT ON THE
              DATE OF  MAILING,  WITHOUT  CHARGE,  PROMPTLY  AFTER  RECEIPT OF A
              WRITTEN REQUEST THEREFOR. UNDER CERTAIN CIRCUMSTANCES SET FORTH IN
              THE RIGHTS AGREEMENT, RIGHTS ISSUED TO, OR HELD BY, ANY PERSON WHO
              IS,  WAS OR  BECOMES  AN  ACQUIRING  PERSON  OR ANY  AFFILIATE  OR
              ASSOCIATE  THEREOF  (AS  SUCH  TERMS  ARE  DEFINED  IN THE  RIGHTS
              AGREEMENT),  WHETHER CURRENTLY HELD BY OR ON BEHALF OF SUCH PERSON
              OR BY ANY SUBSEQUENT HOLDER OF SUCH RIGHTS,  SHALL BECOME NULL AND
              VOID. 

              With respect to such certificates containing the foregoing legend,
until the earlier of (i) the Distribution  Date or (ii) the Expiration Date, the
Rights associated with the Common Stock  represented by such certificates  shall
be evidenced by such  certificates  alone and the  registered  holders of Common
Stock shall also be the  registered  holders of the associated  Rights,  and the
transfer of any of such  certificates  shall also constitute the transfer of the
Rights associated with the Common Stock represented by such certificates. At the
time of the distribution of the Rights Certificates, the Board of Directors may,
at its discretion,  distribute  Rights to the holders of any series of preferred
stock which is  convertible  into shares of the  Company's  Common  Stock on the
basis of the  number of  shares  of  Common  Stock  into  which  such  shares of
preferred stock are convertible.

                                       6

<PAGE>

              Section 4. Form of Rights Certificates.

              (a) The Rights Certificates (and the forms of election to purchase
and  of  assignment  to be  printed  on  the  reverse  thereof)  shall  each  be
substantially  in the form set forth in Exhibit B hereto and may have such marks
of  identification  or designation  and such legends,  summaries or endorsements
printed thereon as the Company may deem  appropriate and as are not inconsistent
with the provisions of this Agreement,  or as may be required to comply with any
applicable law or with any rule or regulation made pursuant  thereto or with any
rule or  regulation  of any stock  exchange on which the Rights may from time to
time be listed, or to conform to usage.  Subject to the provisions of Section 11
and Section 22 hereof, the Rights Certificates,  whenever distributed,  shall be
dated as of the Record  Date,  show the date of  countersignature,  and on their
face  shall  entitle  the  holders  thereof  to  purchase  such  number  of  one
one-hundredths  of a share of Preferred  Stock as shall be set forth  therein at
the price set forth  therein (such  exercise  price per one  one-hundredth  of a
share, the "Purchase Price"), but the amount and type of securities  purchasable
upon the exercise of each Right and the Purchase  Price thereof shall be subject
to adjustment as provided herein.

              (b) Any  Rights  Certificate  issued  pursuant  to  Section  3(a),
Section 11(i) or Section 22 hereof that represents Rights beneficially owned by:
(i) an Acquiring  Person or any  Associate or Affiliate of an Acquiring  Person,
(ii) a transferee of an Acquiring Person (or of any such Associate or Affiliate)
who becomes a transferee  after the  Acquiring  Person  becomes such, or (iii) a
transferee of an Acquiring  Person (or of any such  Associate or Affiliate)  who
becomes a transferee prior to or concurrently with the Acquiring Person becoming
such and receives such Rights pursuant to either (A) a transfer  (whether or not
for  consideration)  from the Acquiring Person to holders of equity interests in
such Acquiring  Person or to any Person with whom such Acquiring  Person has any
agreement,  arrangement or understanding  (whether or not in writing)  regarding
the  transferred  Rights or (B) a  transfer  which the  Board of  Directors  has
determined is part of a plan,  arrangement or  understanding  (whether or not in
writing)  which has as a primary  purpose or effect  avoidance  of Section  7(e)
hereof,  and any Rights  Certificate  issued pursuant to Section 6 or Section 11
hereof upon  transfer,  exchange,  replacement or adjustment of any other Rights
Certificate referred to in this sentence, shall (to the extent feasible) contain
the following legend:

              THE RIGHTS  REPRESENTED  BY THIS  RIGHTS  CERTIFICATE  ARE OR WERE
              BENEFICIALLY  OWNED BY A PERSON  WHO WAS OR  BECAME  AN  ACQUIRING
              PERSON OR AN AFFILIATE  OR  ASSOCIATE  OF AN ACQUIRING  PERSON (AS
              SUCH TERMS ARE DEFINED IN THE RIGHTS AGREEMENT). ACCORDINGLY, THIS
              RIGHTS  CERTIFICATE AND THE RIGHTS REPRESENTED HEREBY SHALL BECOME
              NULL AND VOID IN THE  CIRCUMSTANCES  SPECIFIED  IN SECTION 7(E) OF
              THE RIGHTS AGREEMENT.

              The  Company  shall  instruct  the Rights  Agent in writing of the
Rights  which  should be so legended and shall supply the Rights Agent with such
legended Rights Certificates.

                                       7

<PAGE>

              Section 5. Countersignature and Registration.

              (a) The Rights  Certificates  shall be  executed  on behalf of the
Company by its  Chairman  of the Board,  its  President  or any Vice  President,
either  manually or by facsimile  signature,  and shall have affixed thereto the
Company's  seal or a facsimile  thereof which shall be attested by the Secretary
or an  Assistant  Secretary or the  Treasurer  or an Assistant  Treasurer of the
Company,  either  manually or by facsimile  signature.  The Rights  Certificates
shall be manually  countersigned by the Rights Agent, and shall not be valid for
any  purpose  unless so  countersigned.  In case any  officer of the Company who
shall have signed any of the Rights  Certificates shall cease to be such officer
of the Company  before  countersignature  by the Rights  Agent and  issuance and
delivery  by  the  Company,  such  Rights  Certificates,  nevertheless,  may  be
countersigned  by the Rights Agent, and issued and delivered by the Company with
the same  force and  effect as  though  the  person  who so signed  such  Rights
Certificates  had not ceased to be such officer of the  Company;  and any Rights
Certificates  may be signed on behalf of the  Company by any person  who, at the
actual  date of the  execution  of such  Rights  Certificate,  shall be a proper
officer of the Company to sign such Rights Certificate,  although at the date of
the execution of this Rights Agreement any such person was not such an officer.

              (b) Following the Distribution Date, the Rights Agent will keep or
cause  to be  kept,  at  its  principal  office  or  offices  designated  as the
appropriate  place for the  surrender of Rights  Certificates  upon  exercise or
transfer,  books for registration and transfer of the Rights Certificates issued
hereunder.  Such books  shall  show the names and  addresses  of the  respective
holders of the Rights  Certificates,  the number of Rights evidenced on its face
by  each  of the  Rights  Certificates  and  the  date  of  each  of the  Rights
Certificates.

              Section 6. Transfer,  Split Up, Combination and Exchange of Rights
Certificates; Mutilated, Destroyed, Lost or Stolen Rights Certificates.

              (a) Subject to the  provisions of Section  4(b),  Section 7(e) and
Section 14 hereof,  at any time after the close of business on the  Distribution
Date,  and at or prior to the close of  business  on the  Expiration  Date,  any
Rights Certificate or Certificates (other than Rights Certificates  representing
Rights  that  have  been  exchanged  pursuant  to  Section  24  hereof),  may be
transferred,  split up, combined or exchanged for another Rights  Certificate or
Certificates,  entitling the registered  holder to purchase a like number of one
one-hundredths of a share of Preferred Stock (or,  following a Triggering Event,
Common Stock, other securities, cash or other assets, as the case may be) as the
Rights  Certificate or  Certificates  surrendered  then entitled such holder (or
former  holder in the case of a transfer) to  purchase.  Any  registered  holder
desiring to transfer,  split up,  combine or exchange any Rights  Certificate or
Certificates  shall make such request in writing  delivered to the Rights Agent,
and shall  surrender the Rights  Certificate or  Certificates to be transferred,
split up, combined or exchanged at the principal office or offices of the Rights
Agent  designated  for such  purpose.  Neither the Rights  Agent nor the Company
shall be obligated to take any action  whatsoever  with respect to the transfer,
split up,  combination or exchange of any such  surrendered  Rights  Certificate
until the registered  holder thereof shall have completed and signed the form of
assignment  and  related   certificate  on  the  reverse  side  of  such  Rights
Certificate and shall have provided such additional  evidence of the identity of
the Beneficial  Owner (or former  Beneficial  Owner) or Affiliates or Associates
thereof as the Company  shall

                                       8

<PAGE>

reasonably request.  Thereupon the Rights Agent shall,  subject to Section 4(b),
Section 7(e),  Section 14 and Section 24 hereof,  countersign and deliver to the
Person entitled thereto a Rights Certificate or Rights Certificates, as the case
may be, as so  requested.  The  Company  may  require  payment by the holders of
Rights of a sum sufficient to cover any tax or  governmental  charge that may be
imposed in connection  with any transfer,  split up,  combination or exchange of
Rights Certificates.

              (b) Upon  receipt by the Company and the Rights  Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation of
a Rights Certificate,  and, in case of loss, theft or destruction,  of indemnity
or security  reasonably  satisfactory to them, and  reimbursement to the Company
and the Rights Agent of all reasonable  expenses  incidental  thereto,  and upon
surrender to the Rights Agent and  cancellation  of the Rights  Certificate,  if
mutilated, the Company will execute and deliver a new Rights Certificate of like
tenor to the Rights Agent for  countersignature  and delivery to the  registered
owner in lieu of the Rights Certificate so lost, stolen, destroyed or mutilated.

              Section 7. Exercise of Rights;  Purchase Price; Expiration Date of
Rights.

              (a) Subject to Section 7(e) hereof,  the registered  holder of any
Rights  Certificate  may  exercise  the  Rights  evidenced  thereby  (except  as
otherwise  provided herein including,  without  limitation,  the restrictions on
exercisability  set forth in Section 9(c),  Section 11(a)(iii) and Section 23(a)
hereof)  in  whole or in part at any  time  after  the  Distribution  Date  upon
surrender of the Rights  Certificate,  with the form of election to purchase and
related  certificate  on the reverse side thereof duly  executed,  to the Rights
Agent at the principal office or offices of the Rights Agent designated for such
purpose,  together  with payment of the aggregate  Purchase  Price for the total
number of one one-hundredths of a share of Preferred Stock (or other securities,
cash or other assets,  as the case may be) as to which such  surrendered  Rights
are then exercisable, at or prior to the Expiration Date.

              (b) The Purchase  Price for each one  one-hundredth  of a share of
Preferred  Stock  pursuant  to  the  exercise  of a  Right  shall  initially  be
Ninety-Five  Dollars  ($95.00),  and shall be subject to adjustment from time to
time as provided in Section  11(a)(ii)  and  Section  13(a)  hereof and shall be
payable in lawful  money of the United  States of  America  in  accordance  with
paragraph (c) below.

              (c) Upon receipt of a Rights Certificate  representing exercisable
Rights, with the form of election to purchase and the certificate duly executed,
accompanied by payment with respect to each Right so exercised,  of the Purchase
Price per one  one-hundredth  of a share of  Preferred  Stock (or other  shares,
securities,  cash or other  assets,  as the case may be) to be  purchased as set
forth below and an amount equal to any applicable transfer tax, the Rights Agent
shall,  subject to Section 20(k) hereof,  thereupon promptly (i) (A) requisition
from any transfer agent of the shares of Preferred Stock (or make available,  if
the Rights Agent is the transfer  agent for such  shares)  certificates  for the
total number of one one-hundredths of a share of Preferred Stock to be purchased
and the Company hereby irrevocably  authorizes its transfer agent to comply with
all such requests, or (B) if the Company shall have elected to deposit the total
number of  shares of  Preferred  Stock  issuable  upon  exercise  of the  Rights
hereunder  with a  depositary  agent,  requisition  from  the  depositary  agent
depositary receipts representing such number of one one-hundredths of a share of
Preferred  Stock as are to be  purchased  (in which  case  certificates  for the
shares of 

                                       9

<PAGE>

Preferred Stock  represented by such receipts shall be deposited by the transfer
agent with the  depositary  agent) and the Company  will  direct the  depositary
agent to comply with such request,  (ii) requisition from the Company the amount
of cash,  if any, to be paid in lieu of  fractional  shares in  accordance  with
Section 14  hereof,  (iii)  after  receipt of such  certificates  or  depositary
receipts, cause the same to be delivered to or, upon the order of the registered
holder of such Rights  Certificate,  registered  in such name or names as may be
designated by such holder, and (iv) after receipt thereof, deliver such cash, if
any, to or upon the order of the registered  holder of such Rights  Certificate.
The payment of the  Purchase  Price (as such  amount may be reduced  pursuant to
Section  11(a)(iii)  hereof) shall be made in cash or by certified bank check or
bank draft payable to the order of the Company. In the event that the Company is
obligated to issue other securities (including Common Stock) of the Company, pay
cash and/or  distribute  other  property  pursuant to Section 11(a) hereof,  the
Company will make all arrangements necessary so that such other securities, cash
and/or other property are available for distribution by the Rights Agent, if and
when  appropriate.  The  Company  reserves  the right to  require,  prior to the
occurrence of a Triggering  Event, that upon any exercise of Rights, a number of
Rights be  exercised  so that only  whole  shares of  Preferred  Stock  would be
issued.

              (d) In case the registered holder of any Rights  Certificate shall
exercise less than all the Rights evidenced  thereby,  a new Rights  Certificate
evidencing Rights equivalent to the Rights remaining unexercised shall be issued
by the  Rights  Agent and  delivered  to, or upon the order of,  the  registered
holder of such Rights  Certificate,  registered  in such name or names as may be
designated by such holder, subject to the provisions of Section 14 hereof.

              (e)  Notwithstanding  anything in this  Agreement to the contrary,
from and after the first occurrence of a Section 11(a)(ii) Event or a Section 13
Event, any Rights beneficially owned by: (i) an Acquiring Person or an Associate
or Affiliate of an Acquiring  Person,  (ii) a transferee of an Acquiring  Person
(or of any such  Associate  or  Affiliate)  who becomes a  transferee  after the
Acquiring  Person becomes such, or (iii) a transferee of an Acquiring Person (or
of any such  Associate  or  Affiliate)  who  becomes  a  transferee  prior to or
concurrently  with the Acquiring  Person  becoming such and receives such Rights
pursuant to either (A) a transfer  (whether or not for  consideration)  from the
Acquiring  Person to holders of equity  interests in such Acquiring Person or to
any Person with whom the  Acquiring  Person has any  agreement,  arrangement  or
understanding  (whether or not in writing)  regarding the transferred  Rights or
(B) a transfer  which the Board of  Directors of the Company has  determined  is
part of a plan,  arrangement or understanding  (whether or not in writing) which
has as a primary  purpose or effect the  avoidance of this Section  7(e),  shall
become null and void  without any further  action,  and no holder of such Rights
shall thereupon have any rights whatsoever with respect to such Rights,  whether
under  any  provision  of this  Agreement  or  otherwise  from  and  after  such
occurrence.  The  Company  shall use all  reasonable  efforts to insure that the
provisions of this Section 7(e) and Section 4(b) hereof are complied  with,  but
shall have no liability to any holder of Rights Certificates or any other Person
as a  result  of its  failure  to make any  determinations  with  respect  to an
Acquiring  Person or its Affiliates,  Associates or transferees  hereunder.  The
Rights Agent will endeavor to comply with the provisions hereof to the extent it
has received instructions from the Company concerning such matters.

              (f)  Notwithstanding  anything in this  Agreement to the contrary,
neither the Rights Agent nor the Company  shall be  obligated  to undertake  any
action with respect to a


                                       10
<PAGE>

registered  holder upon the occurrence of any purported  exercise as set forth
in this Section 7 unless such  registered  holder shall have (i)  completed  and
signed the  certificate  contained in the form of election to purchase set forth
on the reverse side of the Rights Certificate surrendered for such exercise, and
(ii) provided such additional  evidence of the identity of the Beneficial  Owner
(or former Beneficial Owner) or Affiliates or Associates  thereof as the Company
shall reasonably request. 

              Section 8. Cancellation of Rights Certificates.

              All Rights  Certificates  surrendered for the purpose of exercise,
transfer, split up, combination or exchange shall, if surrendered to the Company
or any of its agents,  be delivered to the Rights Agent for  cancellation  or in
cancelled  form, or, if  surrendered to the Rights Agent,  shall be cancelled by
it,  and no  Rights  Certificates  shall be  issued  in lieu  thereof  except as
expressly  permitted by any of the  provisions  of this  Agreement.  The Company
shall  deliver to the Rights  Agent for  cancellation  and  retirement,  and the
Rights Agent shall so cancel and retire, any other Rights Certificate  purchased
or acquired by the Company otherwise than upon the exercise thereof.  The Rights
Agent shall deliver all cancelled Rights Certificates to the Company.

              Section 9. Reservation and Availability of Capital Stock.

              (a) The  Company  covenants  and  agrees  that it will cause to be
reserved  and kept  available  out of its  authorized  and  unissued  shares  of
Preferred Stock (and, following the occurrence of a Triggering Event, out of its
authorized and unissued shares of Common Stock and/or other securities or out of
its authorized and issued shares held in its treasury),  the number of shares of
Preferred  Stock (and,  following the occurrence of a Triggering  Event,  Common
Stock and/or other  securities)  that,  as provided in this  Agreement,  will be
sufficient to permit the exercise in full of all outstanding Rights.

              (b) So long as the shares of Preferred  Stock (and,  following the
occurrence of a Triggering Event, Common Stock and/or other securities) issuable
and  deliverable  upon the  exercise of the Rights may be listed on any national
securities  exchange,  the Company shall use its best efforts to cause, from and
after such time as the Rights become  exercisable,  all shares reserved for such
issuance to be listed on such  exchange  upon  official  notice of issuance upon
such  exercise;  provided,  however,  that the Company  shall have no obligation
hereunder  to list the  shares of  Preferred  Stock on any  national  securities
exchange.

              (c) The Company shall use its best efforts to (i) file, as soon as
practicable  following the earliest date after the first occurrence of a Section
11(a)(ii) Event on which the  consideration  to be delivered by the Company upon
exercise of the Rights has been determined in accordance with Section 11(a)(iii)
hereof, or, if required by law, the Distribution Date, a registration  statement
under the  Securities  Act of 1933,  as amended  (the  "Securities  Act"),  with
respect  to  the  securities  purchasable  upon  exercise  of the  Rights  on an
appropriate form, (ii) cause such registration  statement to become effective as
soon as  practicable  after  such  filing,  and (iii)  cause  such  registration
statement  to remain  effective  (with a  prospectus  at all times  meeting  the
requirements  of the  Securities  Act)  until the  earlier of (A) the date as of
which the Rights are no longer  exercisable for such securities and (B) the date
of the  expiration of the Rights.  The Company will also take such action as may
be appropriate under, or to ensure compliance with, the securities or "blue sky"
laws of the

                                       11

<PAGE>

various states in connection with the  exercisability of the Rights. The Company
may  temporarily  suspend,  for a period of time not to exceed  ninety (90) days
after the date set forth in clause  (i) of the first  sentence  of this  Section
9(c),  the  exercisability  of the  Rights  in order to  prepare  and file  such
registration  statement  and  permit  it to  become  effective.  Upon  any  such
suspension,  the Company  shall  issue a public  announcement  stating  that the
exercisability of the Rights has been temporarily suspended, as well as a public
announcement at such time as the suspension is no longer in effect, in each case
with  simultaneous  written  notice to the Rights  Agent.  In  addition,  if the
Company shall determine that a registration  statement is required following the
Distribution Date, the Company may temporarily suspend the exercisability of the
Rights until such time as a registration  statement has been declared effective.
Notwithstanding  any  provision of this  Agreement to the  contrary,  the Rights
shall not be exercisable in any  jurisdiction if the requisite  qualification in
such  jurisdiction has not been obtained,  the exercise thereof is not permitted
under  applicable  law  or  a  registration  statement  has  not  been  declared
effective. Unless otherwise notified in writing by the Company, the Rights Agent
may  assume  that  any  Right  exercised  is  permitted  to be  exercised  under
applicable  law and shall have no  liability  for acting in  reliance  upon such
assumption.

              (d) The  Company  covenants  and agrees that it will take all such
action as may be necessary to ensure that all one  one-hundredths  of a share of
Preferred  Stock (and,  following the occurrence of a Triggering  Event,  Common
Stock and/or other  securities)  delivered upon exercise of the Rights shall, at
the time of delivery of the  certificates for such shares (subject to payment of
the Purchase  Price),  be duly and validly  authorized and issued and fully paid
and nonassessable.

              (e) The Company further covenants and agrees that it will pay when
due and payable any and all federal and state  transfer  taxes and charges which
may be payable in respect of the issuance or delivery of the Rights Certificates
and of any  certificates  for a  number  of one  one-hundredths  of a  share  of
Preferred  Stock (or Common Stock and/or other  securities,  as the case may be)
upon the exercise of Rights. The Company shall not, however,  be required to pay
any  transfer tax which may be payable in respect of any transfer or delivery of
Rights  Certificates  to a Person  other than,  or the issuance or delivery of a
number of one  one-hundredths  of a share of  Preferred  Stock (or Common  Stock
and/or  other  securities,  as the case may be) in  respect of a name other than
that of, the  registered  holder of the  Rights  Certificate  evidencing  Rights
surrendered  for transfer or exercise,  or to issue or deliver any  certificates
for a number of one  one-hundredths  of a share of  Preferred  Stock (or  Common
Stock and/or other securities,  as the case may be) in a name other than that of
the registered  holder upon the exercise of any Rights until such tax shall have
been paid (any such tax being  payable by the holder of such Rights  Certificate
at the time of  surrender)  or until it has been  established  to the  Company's
satisfaction that no such tax is due.

              Section 10. Preferred Stock Record Date.

              Each  Person  in whose  name any  certificate  for a number of one
one-hundredths  of a share of  Preferred  Stock (or Common  Stock  and/or  other
securities,  as the case may be) is issued upon the exercise of Rights shall for
all  purposes  be deemed to have  become  the  holder of record of the shares of
Preferred  Stock (or Common Stock and/or other  securities,  as the case may be)
represented thereby on, and such certificate shall be dated, the date upon which
the Rights  Certificate  evidencing such Rights was duly surrendered and payment
of the 

                                       12

<PAGE>

Purchase Price (and all applicable transfer taxes) was made; provided,  however,
that if the  date  of such  surrender  and  payment  is a date  upon  which  the
Preferred  Stock (or Common Stock and/or other  securities,  as the case may be)
transfer  books of the Company are closed,  such Person  shall be deemed to have
become the record holder of such shares on, and such certificate shall be dated,
the next  succeeding  Business Day on which the Preferred Stock (or Common Stock
and/or other  securities,  as the case may be) transfer books of the Company are
open.  Prior to the exercise of the Rights  evidenced  thereby,  the holder of a
Rights  Certificate  shall not be entitled to any rights of a shareholder of the
Company  with  respect  to shares  for which the  Rights  shall be  exercisable,
including,  without limitation, the right to vote, to receive dividends or other
distributions or to exercise any preemptive rights, and shall not be entitled to
receive any notice of any proceedings of the Company, except as provided herein.

              Section  11.  Adjustment  of  Purchase  Price,  Number and Kind of
Shares or Number of Rights.

              The Purchase Price,  the number and kind of shares covered by each
Right and the number of Rights  outstanding  are subject to adjustment from time
to time as provided in this Section 11. 

              (a) (i) In the event the Company  shall at any time after the date
of this  Agreement  (A) declare a dividend  on the  Preferred  Stock  payable in
shares of Preferred  Stock,  (B) subdivide the outstanding  Preferred Stock, (C)
combine the outstanding  Preferred Stock into a smaller number of shares, or (D)
issue any shares of its capital  stock in a  reclassification  of the  Preferred
Stock (including any such reclassification in connection with a consolidation or
merger in which the Company is the continuing or surviving corporation),  except
as  otherwise  provided in this  Section  11(a) and  Section  7(e)  hereof,  the
Purchase  Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification, and the
number and kind of shares of Preferred  Stock or capital stock,  as the case may
be, issuable on such date, shall be proportionately  adjusted so that the holder
of any Right  exercised  after  such time shall be  entitled  to  receive,  upon
payment of the Purchase Price then in effect,  the aggregate  number and kind of
shares of Preferred  Stock or capital stock,  as the case may be, which, if such
Right had been exercised  immediately  prior to such date and at a time when the
Preferred  Stock transfer books of the Company were open, such holder would have
owned  upon  such  exercise  and been  entitled  to  receive  by  virtue of such
dividend, subdivision, combination or reclassification. If an event occurs which
would  require  an  adjustment  under both this  Section  11(a)(i)  and  Section
11(a)(ii) hereof, the adjustment  provided for in this Section 11(a)(i) shall be
in addition to, and shall be made prior to, any adjustment  required pursuant to
Section 11(a)(ii) hereof.

              (ii)  Subject to Section  24 of this  Agreement,  in the event any
Person shall, at any time after the Rights Dividend Declaration Date, becomes an
Acquiring Person,  then, promptly following the occurrence of such event, proper
provision shall be made so that each holder of a Right (except as provided below
and in Section 7(e) hereof)  shall  thereafter  have the right to receive,  upon
exercise thereof at the then current Purchase Price in accordance with the terms
of this  Agreement,  in lieu of a  number  of one  one-hundredths  of a share of
Preferred  Stock,  such number of shares of Common Stock of the Company as shall
equal the result obtained by (x) multiplying the then current  Purchase Price by
the number of one one-hundredths of a share of Preferred Stock for which a Right
was exercisable immediately prior 

                                       13

<PAGE>

to the first  occurrence  of a Section  11(a)(ii)  Event,  and (y) dividing that
product (which, following such first occurrence, shall thereafter be referred to
as the "Purchase  Price" for each Right and for all purposes of this  Agreement)
by fifty  percent  (50%) of the current  market  price  (determined  pursuant to
Section  11(d)  hereof)  per  share of  Common  Stock on the date of such  first
occurrence (such number of shares, the "Adjustment Shares").

              (iii) In the event that the number of shares of Common Stock which
is authorized by the Company's  Certificate of Incorporation but not outstanding
or reserved for issuance for purposes  other than upon exercise of the Rights is
not  sufficient to permit the exercise in full of the Rights in accordance  with
the foregoing  subparagraph  (ii) of this Section 11(a),  the Company shall: (A)
determine the excess of (1) the value of the Adjustment Shares issuable upon the
exercise of a Right (the  "Current  Value")  over (2) the  Purchase  Price (such
excess,  the  "Spread"),  and (B) with respect to each Right (subject to Section
7(e) hereof),  make adequate  provision to substitute for the Adjustment Shares,
upon the exercise of a Right and payment of the applicable  Purchase Price,  (1)
cash,  (2) a reduction in the Purchase  Price,  (3) Common Stock or other equity
securities of the Company (including,  without  limitation,  shares, or units of
shares,  of preferred  stock,  such as the Preferred  Stock,  which the Board of
Directors  of the  Company  has  deemed to have  essentially  the same  value or
economic  rights as  shares of Common  Stock  (such  shares of  preferred  stock
referred to herein as "common stock  equivalents")),  (4) debt securities of the
Company,  (5) other assets or (6) any  combination of the  foregoing,  having an
aggregate  value equal to the Current Value (less the amount of any reduction in
the Purchase Price), where such aggregate value has been determined by the Board
of  Directors of the Company  based upon the advice of a  nationally  recognized
investment  banking  firm  selected by the Board of  Directors  of the  Company;
provided, however, that if the Company shall not have made adequate provision to
deliver value pursuant to clause (B) above within thirty (30) days following the
later of (x) the first occurrence of a Section  11(a)(ii) Event and (y) the date
on which the  Company's  right of  redemption  pursuant to Section 23(a) expires
(the later of (x) and (y) being  referred  to herein as the  "Section  11(a)(ii)
Trigger  Date"),  then the  Company  shall be  obligated  to  deliver,  upon the
surrender for exercise of a Right and without  requiring payment of the Purchase
Price,  shares of Common Stock (to the extent available) and then, if necessary,
cash,  which shares and/or cash have an aggregate value equal to the Spread.  If
the Board of Directors of the Company  shall  determine in good faith that it is
likely that sufficient additional shares of Common Stock could be authorized for
issuance  upon  exercise in full of the  Rights,  the thirty (30) day period set
forth above may be extended  to the extent  necessary,  but not more than ninety
(90) days after the Section  11(a) (ii) Trigger  Date, in order that the Company
may seek shareholder  approval for the  authorization of such additional  shares
(such thirty (30) day period,  as it may be extended,  referred to herein as the
"Substitution  Period").  To the extent  that the Company  determines  that some
action  need be taken  pursuant to the first  and/or  second  sentences  of this
Section  11(a)(iii),  the Company  (x) shall  provide,  subject to Section  7(e)
hereof,  that such action shall apply uniformly to all outstanding  Rights,  and
(y) may suspend the  exercisability  of the Rights until the  expiration  of the
Substitution  Period  in  order  to seek  such  shareholder  approval  for  such
authorization  of  additional  shares and/or to decide the  appropriate  form of
distribution  to be made  pursuant to such first  sentence and to determine  the
value thereof.  In the event of any such  suspension,  the Company shall issue a
public  announcement  stating  that the  exercisability  of the  Rights has been
temporarily  suspended,  as well as a public  announcement  at such  time as the
suspension is no longer in effect. For purposes of this Section 11(a)(iii),  the
value of each Adjustment  Share shall be the current market price (as determined
pursuant to Section  11(d)  hereof) per share of the 

                                       14

<PAGE>

Common Stock on the Section 11(a)(ii) Trigger Date and the per share or per unit
value of any  "common  stock  equivalent"  shall be deemed to equal the  current
market price per share of the Common Stock on such date.

              (b) In case the Company  shall fix a record date for the  issuance
of rights,  options or warrants to all holders of Preferred Stock entitling them
to subscribe  for or purchase  (for a period  expiring  within  forty-five  (45)
calendar days after such record date) Preferred Stock (or shares having the same
rights, privileges and preferences as the shares of Preferred Stock ("equivalent
preferred stock")) or securities  convertible into Preferred Stock or equivalent
preferred  stock  at a price  per  share  of  Preferred  Stock  or per  share of
equivalent  preferred  stock  (or  having a  conversion  price per  share,  if a
security  convertible  into Preferred Stock or equivalent  preferred stock) less
than the current market price (as  determined  pursuant to Section 11(d) hereof)
per share of Preferred  Stock on such record date,  the Purchase  Price to be in
effect after such record date shall be  determined by  multiplying  the Purchase
Price  in  effect  immediately  prior to such  record  date by a  fraction,  the
numerator of which shall be the number of shares of Preferred Stock  outstanding
on such  record  date,  plus the number of shares of  Preferred  Stock which the
aggregate offering price of the total number of shares of Preferred Stock and/or
equivalent  preferred  stock so to be  offered  (and/or  the  aggregate  initial
conversion price of the convertible  securities so to be offered) would purchase
at such current market price,  and the  denominator of which shall be the number
of shares of Preferred Stock outstanding on such record date, plus the number of
additional  shares of Preferred  Stock and/or  equivalent  preferred stock to be
offered for  subscription or purchase (or into which the convertible  securities
so to be offered are initially convertible). In case such subscription price may
be paid by delivery of consideration part or all of which may be in a form other
than cash, the value of such consideration  shall be as determined in good faith
by the Board of Directors of the Company, whose determination shall be described
in a  statement  filed with the Rights  Agent and shall be binding on the Rights
Agent and the holders of the Rights.  Shares of Preferred Stock owned by or held
for the account of the Company shall not be deemed  outstanding  for the purpose
of any such  computation.  Such adjustment shall be made  successively  whenever
such a record date is fixed,  and in the event that such rights or warrants  are
not so issued,  the Purchase  Price shall be adjusted to be the  Purchase  Price
which would then be in effect if such record date had not been fixed.

              (c) In case the Company shall fix a record date for a distribution
to all holders of  Preferred  Stock  (including  any such  distribution  made in
connection with a consolidation or merger in which the Company is the continuing
corporation) of evidences of indebtedness,  cash (other than a regular quarterly
cash dividend out of the earnings or retained  earnings of the Company),  assets
(other than a dividend  payable in Preferred  Stock,  but including any dividend
payable in stock other than Preferred Stock) or subscription  rights or warrants
(excluding those referred to in Section 11(b) hereof),  the Purchase Price to be
in effect after such record date shall be determined by multiplying the Purchase
Price  in  effect  immediately  prior to such  record  date by a  fraction,  the
numerator of which shall be the current market price (as determined  pursuant to
Section 11(d) hereof) per share of Preferred Stock on such record date, less the
fair market value (as  determined in good faith by the Board of Directors of the
Company,  whose  determination  shall be described in a statement filed with the
Rights Agent) of the portion of the cash, assets or evidences of indebtedness so
to be distributed  or of such  subscription  rights or warrants  applicable to a
share of  Preferred  Stock and the  denominator  of which shall be such  current
market  price (as  determined  pursuant  to Section  

                                       15


<PAGE>

11(d)  hereof) per share of  Preferred  Stock.  Such  adjustments  shall be made
successively  whenever  such a record date is fixed,  and in the event that such
distribution  is not so made,  the  Purchase  Price  shall be adjusted to be the
Purchase  Price which would have been in effect if such record date had not been
fixed.

              (d) (i) For the purpose of any computation  hereunder,  other than
computations  made pursuant to Section  11(a)(iii)  hereof,  the "current market
price" per share of Common  Stock on any date shall be deemed to be the  average
of the daily  Closing  Prices per share of such Common Stock for the thirty (30)
consecutive  Trading Days  immediately  prior to such date,  and for purposes of
computations  made pursuant to Section  11(a)(iii)  hereof,  the "current market
price" per share of Common  Stock on any date shall be deemed to be the  average
of the daily  Closing  Prices  per share of such  Common  Stock for the ten (10)
consecutive  Trading Days immediately  following such date;  provided,  however,
that in the event that the current market price per share of the Common Stock is
determined  during a period  following  the  announcement  by the issuer of such
Common Stock of (A) a dividend or  distribution  on such Common Stock payable in
shares of such Common Stock or securities convertible into shares of such Common
Stock  (other  than  the  Rights),  or  (B)  any  subdivision,   combination  or
reclassification  of such  Common  Stock,  and  prior to the  expiration  of the
requisite  thirty (30) Trading Day or ten (10) Trading Day period,  as set forth
above,  after the  ex-dividend  date for such dividend or  distribution,  or the
record date for such subdivision, combination or reclassification,  then, and in
each such case,  the "current  market price" shall be properly  adjusted to take
into account ex-dividend trading.

              (ii) For the purpose of any  computation  hereunder,  the "current
market  price" per share of  Preferred  Stock  shall be  determined  in the same
manner as set forth above for the Common Stock in Section  11(d)(i)  hereof.  If
the current  market price per share of Preferred  Stock cannot be  determined in
the manner  provided  above or if the  Preferred  Stock is not publicly  held or
listed or traded in a manner  described in  subsection  (g) of Section 1 hereof,
the "current  market price" per share of Preferred  Stock shall be  conclusively
deemed  to be an  amount  equal  to 100 (as  such  number  may be  appropriately
adjusted for such events as stock splits, stock dividends and  recapitalizations
with respect to the Common  Stock  occurring  after the date of this  Agreement)
multiplied by the current market price per share of the Common Stock. If neither
the  Common  Stock  nor the  Preferred  Stock is  publicly  held or so listed or
traded,  "current market price" per share shall mean the fair value per share as
determined  in good  faith  by the  Board of  Directors  of the  Company,  whose
determination  shall be described in a statement filed with the Rights Agent and
shall be conclusive for all purposes.  For all purposes of this  Agreement,  the
"current market price" of one  one-hundredth of a share of Preferred Stock shall
be equal to the "current  market price" of one share of Preferred  Stock divided
by 100. 

              (e) Anything herein to the contrary notwithstanding, no adjustment
in the Purchase Price shall be required unless such adjustment  would require an
increase  or  decrease  of at least  one  percent  (1%) in the  Purchase  Price;
provided,  however,  that any adjustments  which by reason of this Section 11(e)
are not  required to be made shall be carried  forward and taken into account in
any subsequent adjustment.  All calculations under this Section 11 shall be made
to the nearest cent or to the nearest  ten-thousandth of a share of Common Stock
or other share or  one-millionth  of a share of Preferred Stock, as the case may
be.  Notwithstanding  the first sentence of this Section  11(e),  any adjustment
required by this 

                                       16


<PAGE>

Section 11 shall be made no later  than the  earlier of (i) three (3) years from
the  date of the  transaction  which  mandates  such  adjustment,  or  (ii)  the
Expiration Date.

              (f) If as a result  of an  adjustment  made  pursuant  to  Section
11(a)(ii) or Section 13(a) hereof, the holder of any Right thereafter  exercised
shall  become  entitled  to  receive  any  shares of  capital  stock  other than
Preferred  Stock,  thereafter the number of such other shares so receivable upon
exercise  of any  Right and the  Purchase  Price  thereof  shall be  subject  to
adjustment  from time to time in a manner and on terms as nearly  equivalent  as
practicable to the provisions  with respect to the Preferred  Stock contained in
Sections  11(a),  (b),  (c),  (e),  (g),  (h),  (i),  (j),  (k) and (m), and the
provisions  of Sections 7, 9, 10, 13 and 14 hereof with respect to the Preferred
Stock shall  apply on like terms to any such other  shares;  provided,  however,
that the  Company  shall not be liable for its  inability  to  reserve  and keep
available for issuance upon exercise of the Rights pursuant to Section 11(a)(ii)
a number of shares of Common Stock  greater than the number then  authorized  by
the Certificate of  Incorporation of the Company but not outstanding or reserved
for other purposes.

              (g) All Rights originally issued by the Company  subsequent to any
adjustment  made to the Purchase  Price  hereunder  shall  evidence the right to
purchase,  at the adjusted Purchase Price, the number of one one-hundredths of a
share of Preferred Stock  purchasable  from time to time hereunder upon exercise
of the Rights, all subject to further adjustment as provided herein.

              (h) Unless  the  Company  shall have  exercised  its  election  as
provided in Section  11(i),  upon each  adjustment  of the  Purchase  Price as a
result  of  the  calculations  made  in  Sections  11(b)  and  (c),  each  Right
outstanding  immediately prior to the making of such adjustment shall thereafter
evidence the right to purchase,  at the adjusted  Purchase Price, that number of
one  one-hundredths  of a share of Preferred  Stock  (calculated  to the nearest
one-millionth)  obtained by (i) multiplying (x) the number of one one-hundredths
of a share covered by a Right  immediately  prior to this  adjustment by (y) the
Purchase Price in effect  immediately  prior to such  adjustment of the Purchase
Price, and (ii) dividing the product so obtained by the Purchase Price in effect
immediately after such adjustment of the Purchase Price.

              (i) The Company  may elect on or after the date of any  adjustment
of the Purchase Price to adjust the number of Rights,  in lieu of any adjustment
in the number of one  one-hundredths  of a share of Preferred Stock  purchasable
upon  the  exercise  of a  Right.  Each  of the  Rights  outstanding  after  the
adjustment  in the number of Rights shall be  exercisable  for the number of one
one-hundredths  of a share of Preferred  Stock for which a Right was exercisable
immediately prior to such adjustment, at the adjusted Purchase Price. Each Right
held of record  prior to such  adjustment  of the number of Rights  shall become
that number of Rights  (calculated  to the nearest  ten-thousandth)  obtained by
dividing the Purchase  Price in effect  immediately  prior to  adjustment of the
Purchase Price by the Purchase Price in effect  immediately  after adjustment of
the Purchase Price. The Company shall make a public announcement of its election
to adjust the number of Rights,  indicating the record date for the  adjustment,
and, if known at the time, the amount of the adjustment to be made.  This record
date  may be the  date on  which  the  Purchase  Price  is  adjusted  or any day
thereafter,  but, if the Rights Certificates have been issued, shall be at least
ten (10)  days  later  than  the  date of the  public  announcement.  If  Rights
Certificates  have been  issued,  upon each  adjustment  of the number of Rights
pursuant to this Section 11(i), the Company shall,

                                       17


<PAGE>

as  promptly as  practicable,  cause to be  distributed  to holders of record of
Rights Certificates on such record date Rights Certificates evidencing,  subject
to Section 14  hereof,  the  additional  Rights to which such  holders  shall be
entitled as a result of such adjustment, or, at the option of the Company, shall
cause  to  be  distributed  to  such  holders  of  record  in  substitution  and
replacement for the Rights  Certificates  held by such holders prior to the date
of  adjustment,  and upon  surrender  thereof,  if required by the Company,  new
Rights  Certificates  evidencing  all the Rights to which such holders  shall be
entitled after such adjustment.  Rights  Certificates to be so distributed shall
be issued, executed and countersigned in the manner provided for herein (and may
bear, at the option of the Company,  the adjusted  Purchase  Price) and shall be
registered in the names of the holders of record of Rights  Certificates  on the
record date specified in the public announcement.

              (j) Irrespective of any adjustment or change in the Purchase Price
or the number of one  one-hundredths of a share of Preferred Stock issuable upon
the exercise of the Rights, the Rights  Certificates  theretofore and thereafter
issued may continue to express the  Purchase  Price per one  one-hundredth  of a
share and the number of one  one-hundredths  of a share which were  expressed in
the initial Rights Certificates issued hereunder.

              (k)  Before  taking  any action  that  would  cause an  adjustment
reducing the Purchase Price below the then par value  attributable to the number
of one  one-hundredths  of a share of Preferred  Stock issuable upon exercise of
the  Rights,  the  Company  shall take any  corporate  action  which may, in the
opinion of its  counsel,  be necessary in order that the Company may validly and
legally issue, fully paid and  nonassessable,  such number of one one-hundredths
of a share of Preferred Stock at such adjusted Purchase Price.

              (l) In any case in which  this  Section 11 shall  require  that an
adjustment  in the  Purchase  Price be made  effective as of a record date for a
specified  event,  the Company may elect to defer until the  occurrence  of such
event the issuance to the holder of any Right  exercised  after such record date
of the  number of one  one-hundredths  of a share of  Preferred  Stock and other
capital stock or securities of the Company,  if any, issuable upon such exercise
over and above the number of one  one-hundredths  of a share of Preferred  Stock
and other capital stock or securities of the Company, if any, issuable upon such
exercise on the basis of the Purchase Price in effect prior to such  adjustment;
provided,  however,  that the Company shall deliver to such holder a due bill or
other  appropriate  instrument  evidencing  such holder's  right to receive such
additional  shares or securities upon the occurrence of the event requiring such
adjustment.

              (m) Anything in this  Section 11 to the contrary  notwithstanding,
the Company shall be entitled to make such  reductions in the Purchase Price, in
addition to those adjustments  expressly  required by this Section 11, as and to
the  extent  that the  Board of  Directors  of the  Company,  in its good  faith
judgment, shall determine to be advisable in order that any (i) consolidation or
subdivision of the Preferred Stock,  (ii) issuance wholly for cash of any shares
of Preferred Stock at less than the current market price,  (iii) issuance wholly
for cash of shares of  Preferred  Stock or  securities  which by their terms are
convertible  into or  exchangeable  for shares of  Preferred  Stock,  (iv) stock
dividends  or (v)  issuance of rights,  options or warrants  referred to in this
Section  11,  hereafter  made by the Company to holders of its  Preferred  Stock
shall not be taxable to such  shareholders.  

                                       18


<PAGE>

              (n) The  Company  covenants  and agrees  that it shall not, at any
time after the  Distribution  Date, (i) consolidate with any other Person (other
than a  consolidation  with a Subsidiary of the Company in a  transaction  which
does not violate the  provisions  of Section 11(o)  hereof),  (ii) merge with or
into any other Person (other than a merger with a Subsidiary of the Company in a
transaction  which does not violate the provisions of Section 11(o) hereof),  or
(iii) sell or transfer (or permit any  Subsidiary to sell or  transfer),  in one
transaction or a series of related transactions,  assets,  earning power or cash
flow aggregating  more than fifty percent (50%) of the assets,  earning power or
cash flow of the  Company and its  Subsidiaries  (taken as a whole) to any other
Person or Persons  (other than a sale or  transfer to the Company  and/or any of
its Subsidiaries in one or more  transactions each of which does not violate the
provisions of Section 11(o) hereof),  if (x) at the time of or immediately after
such  consolidation,  merger or sale  there are any  rights,  warrants  or other
instruments  or  securities  outstanding  or  agreements  in effect  which would
substantially  diminish  or  otherwise  eliminate  the  benefits  intended to be
afforded by the Rights or (y) prior to, simultaneously with or immediately after
such  consolidation,  merger  or  sale,  the  shareholders  of  the  Person  who
constitutes,  or would constitute, the "Principal Party" for purposes of Section
13(a) hereof shall have received a distribution  of Rights  previously  owned by
such Person or any of its Affiliates and Associates.

              (o) The Company  covenants  and agrees that,  after the earlier of
the  Distribution  Date or the Stock  Acquisition  Date, it will not,  except as
permitted by Section 23 or Section 27 hereof,  take (or permit any Subsidiary to
take)  any  action  if at  the  time  such  action  is  taken  it is  reasonably
foreseeable that such action will diminish  substantially or otherwise eliminate
the benefits intended to be afforded by the Rights.

              (p) Anything in this Agreement to the contrary notwithstanding, in
the event that the  Company  shall at any time after the date of this  Agreement
and prior to the  Distribution  Date (i) declare a dividend  on the  outstanding
shares of Common Stock  payable in shares of Common  Stock,  (ii)  subdivide the
outstanding  shares of Common Stock, or (iii) combine the outstanding  shares of
Common Stock into a smaller  number of shares,  the number of Rights  associated
with each  share of  Common  Stock  then  outstanding,  or  issued or  delivered
thereafter but prior to the Distribution Date, shall be proportionately adjusted
so that the  number of Rights  thereafter  associated  with each share of Common
Stock  following any such event shall equal the result  obtained by  multiplying
the  number of Rights  associated  with each share of Common  Stock  immediately
prior to such event by a fraction, the numerator which shall be the total number
of shares of Common Stock  outstanding  immediately  following the occurrence of
the event and the  denominator  of which shall be the total  number of shares of
Common Stock outstanding immediately prior to the occurrence of such event.

              Section 12.  Certificate  of Adjusted  Purchase Price or Number of
Shares.

              Whenever  an  adjustment  is made as  provided  in  Section  11 or
Section 13 hereof, the Company shall (a) promptly prepare a certificate  setting
forth such  adjustment  and a brief  statement of the facts  accounting for such
adjustment, (b) promptly file with the Rights Agent and with each transfer agent
for the Preferred Stock and the Common Stock a copy of such  certificate and (c)
if a Distribution Date has occurred, mail a brief summary thereof to each holder
of a Rights  Certificate in accordance with Section 26 hereof.  The Rights Agent
shall  be  fully  protected  in  relying  on  any  such  certificate  and on any
adjustment  therein  

                                       19


<PAGE>

contained and shall not be deemed to have  knowledge of such  adjustment  unless
and until it shall have received such certificate.

              Section 13.  Consolidation,  Merger or Sale or Transfer of Assets,
Cash Flow or Earning Power.

              (a) In the  event  that,  following  the Stock  Acquisition  Date,
directly or indirectly,  (x) the Company shall  consolidate  with, or merge with
and into,  any  other  Person  (other  than a  Subsidiary  of the  Company  in a
transaction which complies with Section 11(o) hereof), and the Company shall not
be the continuing or surviving  corporation of such consolidation or merger, (y)
any Person  (other  than a  Subsidiary  of the  Company in a  transaction  which
complies with Section 11(o)  hereof)  shall  consolidate  with, or merge with or
into,  the  Company,  and the  Company  shall  be the  continuing  or  surviving
corporation  of such  consolidation  or  merger  and,  in  connection  with such
consolidation or merger,  all or part of the outstanding  shares of Common Stock
shall be changed into or exchanged  for stock or other  securities  of any other
Person  or  cash or any  other  property,  or (z) the  Company  shall  sell,  or
otherwise  transfer (or one or more of its Subsidiaries  shall sell or otherwise
transfer),  in one  transaction  or a series of  related  transactions,  assets,
earning  power or cash flow  aggregating  more than fifty  percent  (50%) of the
assets, earning power or cash flow of the Company and its Subsidiaries (taken as
a whole) to any Person or Persons  (other than the Company or any  Subsidiary of
the Company in one or more  transactions  each of which  complies  with  Section
11(o)  hereof),  then, and in each such case (except as may be  contemplated  by
Section 13(d) hereof),  proper  provision shall be made so that: (i) each holder
of a Right (other than Rights that  heretofore  became null and void pursuant to
Section  7(e)  hereof)  shall  thereafter  have the right to  receive,  upon the
exercise thereof at the then current Purchase Price in accordance with the terms
of this Agreement (or, if any Section  11(a)(ii) event has occurred prior to the
first  occurrence  of a Section  13(a) Event,  at the  Purchase  Price in effect
immediately prior to the first occurrence of a Section  11(a)(ii)  event),  such
number of validly authorized and issued,  fully paid,  non-assessable and freely
tradeable  shares  of  Common  Stock of the  Principal  Party  (as such  term is
hereinafter defined), free and clear of any liens, encumbrances, rights of first
refusal or other adverse claims, as shall be equal to the result obtained by (1)
multiplying the then current Purchase Price by the number of one  one-hundredths
of a share of Preferred Stock for which a Right is exercisable immediately prior
to the first occurrence of a Section 13 Event (or, if a Section  11(a)(ii) Event
has occurred  prior to the first  occurrence of a Section 13 Event,  multiplying
the number of one one-hundredths of a share of Preferred Stock for which a Right
was exercisable immediately prior to the first occurrence of a Section 11(a)(ii)
Event  by  the  Purchase  Price  in  effect  immediately  prior  to  such  first
occurrence),   and  (2)  dividing  that  product  (which,  following  the  first
occurrence of a Section 13 Event,  shall be referred to as the "Purchase  Price"
for each Right and for all purposes of this Agreement) by fifty percent (50%) of
the current market price  (determined  pursuant to Section  11(d)(i) hereof) per
share of the Common Stock of such Principal Party on the date of consummation of
such Section 13 Event; (ii) such Principal Party shall thereafter be liable for,
and shall assume,  by virtue of such Section 13 Event,  all the  obligations and
duties of the Company pursuant to this Agreement; (iii) the term "Company" shall
thereafter be deemed to refer to such  Principal  Party,  it being  specifically
intended  that the  provisions  of  Section 11 hereof  shall  apply only to such
Principal Party following the first occurrence of a Section 13 Event;  (iv) such
Principal  Party  shall  take such steps  (including,  but not  limited  to, the
reservation of a sufficient  number of shares of its Common Stock) in connection
with the consummation of any such 

                                       20


<PAGE>

transaction  as may be  necessary  to assure that the  provisions  hereof  shall
thereafter be  applicable,  as nearly as  reasonably  may be, in relation to its
shares of Common Stock  thereafter  deliverable upon the exercise of the Rights;
and (v) the  provisions  of  Section  11(a)  (ii)  hereof  shall be of no effect
following the first occurrence of any Section 13 Event.

              (b) "Principal Party" shall mean:

                   (i) in the case of any transaction described in clause (x) or
(y) of the first sentence of Section 13(a) hereof, the Person that is the issuer
of any securities into which shares of Common Stock of the Company are converted
in such merger or consolidation,  and if no securities are so issued, the Person
that is the other party to such merger or consolidation; and

                   (ii) in the case of any  transaction  described in clause (z)
of the first  sentence  of Section  13(a)  hereof,  the Person that is the party
receiving  the  greatest  portion  of the  assets,  earning  power or cash  flow
transferred  pursuant to such  transaction or transactions;  provided,  however,
that in any such case,  (1) if the Common  Stock of such  Person is not, at such
time and has not been  continuously over the preceding twelve (12) month period,
registered  under Section 12 of the Exchange Act, and such Person is a direct or
indirect  Subsidiary of another Person the Common Stock of which is and has been
so registered,  "Principal  Party" shall refer to such other Person;  and (2) in
case such  Person is a  Subsidiary,  directly  or  indirectly,  of more than one
Person,  the  Common  Stock  of two or  more  of  which  are  and  have  been so
registered,  "Principal  Party"  shall refer to whichever of such Persons is the
issuer of the Common Stock having the greatest  aggregate  market  value.  

              (c) The  Company  shall  not  consummate  any such  consolidation,
merger,  sale or  transfer  unless the  Principal  Party  shall have  sufficient
authorized  and unissued  shares of Common Stock not reserved for other purposes
to permit the full  exercise of the Rights in  accordance  with this Section 13,
and unless  prior  thereto  the  Company  and such  Principal  Party  shall have
executed and delivered to the Rights Agent a  supplemental  agreement  providing
for the terms set forth in paragraphs (a) and (b) of this Section 13 and further
providing  that,  as soon as  practicable  after the date of any  consolidation,
merger,  sale or transfer of assets  mentioned in paragraph  (a) of this Section
13, the Principal Party will at its own expense:

                   (i)  prepare  and file a  registration  statement  under  the
Securities  Act with respect to the Rights and the securities  purchasable  upon
exercise of the Rights on an appropriate  form, and will use its best efforts to
cause such registration statement to (A) become effective as soon as practicable
after such  filing  and (B) remain  effective  (with a  prospectus  at all times
meeting the  requirements of the Securities  Act) until the Expiration  Date; 

                   (ii) use its best  efforts to qualify or register  the rights
and the securities  purchasable upon exercise of the Rights under the securities
blue sky laws of such jurisdictions as may be necessary or appropriate;  

                   (iii) use its best efforts to list or continue the listing of
the Rights  and the  securities  purchasable  upon  exercise  of the Rights on a
national  securities  exchange  or to  meet  the  eligibility  requirements  for
quotations  on NASDAQ;  and 

                                       21

<PAGE>

                   (iv)  deliver to holders of the Rights  historical  financial
statements for the Principal  Party and each of its  Affiliates  which comply in
all  respects  with the  requirements  for  registration  on Form 10  under  the
Exchange Act.

              The  provisions  of this  Section  13  shall  similarly  apply  to
successive  mergers or consolidations or sales or other transfers.  In the event
that a  Section  13 Event  shall  occur at any time  after the  occurrence  of a
Section  11(a)(ii)  Event,  the Rights which have not theretofore been exercised
shall  thereafter  become  exercisable in the manner  described in Section 13(a)
hereof.  

              (d) In no event  shall the  Rights  Agent  have any  liability  in
respect of any such Principal Party transactions, including, without limitation,
the  propriety  thereof.  The Rights  Agent may rely and be fully  protected  in
relying upon a certificate  of the Company  stating that the  provisions of this
Section 13 have been  fulfilled.  Notwithstanding  anything in this Agreement to
the contrary,  the prior written consent of the Rights Agent must be obtained in
connection with any supplemental  agreement which alters the rights or duties of
the Rights Agent.  

              Section 14. Fractional Rights and Fractional Shares.

              (a) The  Company  shall  not be  required  to issue  fractions  of
Rights,  except  prior to the  Distribution  Date as provided  in Section  11(p)
hereof, or to distribute Rights  Certificates which evidence  fractional Rights.
In lieu of such fractional Rights, there shall be paid to the registered holders
of the Rights  Certificates  with regard to which such  fractional  Rights would
otherwise  be  issuable,  an amount in cash  equal to the same  fraction  of the
current market value of a whole Right.  For purposes of this Section 14(a),  the
current  market value of a whole Right shall be the Closing  Price of the Rights
for the  Trading  Day  immediately  prior to the date on which  such  fractional
Rights would have been otherwise  issuable.  The Closing Price of the Rights for
any day shall be the last sale  price,  or, in case no such sale takes  place on
such day,  the average of the closing  bid and asked  prices,  in either case as
reported in the principal consolidated transaction reporting system with respect
to securities  listed or admitted to trading on the New York Stock  Exchange or,
if the  Rights  are not  listed or  admitted  to  trading  on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national  securities exchange
on which the Rights are listed or admitted to trading,  or if the Rights are not
listed or  admitted to trading on any  national  securities  exchange,  the last
quoted  price,  or, if not so quoted,  the average of the high bid and low asked
prices in the  over-the-counter  market,  as  reported  by NASDAQ or such  other
system then in use or, if on any such date the Rights are not quoted by any such
organization,  the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors of the  Company.  If on any such date no such market maker is making a
market in the Rights, the fair value of the Rights on such date as determined in
good faith by the Board of Directors of the Company shall be used.

              (b) The Company shall not be required to issue fractions of shares
of Preferred  Stock (other than  fractions  which are integral  multiples of one
one-hundredth  of a share of Preferred  Stock) upon exercise of the Rights or to
distribute  certificates  which evidence  fractional  shares of Preferred  Stock
(other than fractions  which are integral  multiples of one  one-hundredth  of a
share of Preferred  Stock). In lieu of fractional shares of Preferred Stock 

                                       22

<PAGE>

that are not  integral  multiples of one  one-hundredth  of a share of Preferred
Stock, the Company may pay to the registered  holders of Rights  Certificates at
the time such Rights are exercised as herein provided an amount in cash equal to
the same fraction of the current market price of one one-hundredth of a share of
Preferred Stock. For purposes of this Section 14(b), the current market price of
one  one-hundredth  of a share of Preferred Stock shall be one  one-hundredth of
the  Closing  Price of a share of  Preferred  Stock (as  determined  pursuant to
Section  11(d)(ii)  hereof) for the Trading Day immediately prior to the date of
such exercise.

              (c) Following the  occurrence of a Triggering  Event,  the Company
shall not be required to issue fractions of shares of Common Stock upon exercise
of the Rights or to distribute  certificates which evidence fractional shares of
Common Stock. In lieu of fractional  shares of Common Stock, the Company may pay
to the  registered  holders of Rights  Certificates  at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current  market  price of one (1) share of Common  Stock.  For  purposes of this
Section  14(c),  the current market price of one (1) share of Common Stock shall
be the Closing Price of one (1) share of Common Stock (as determined pursuant to
Section  11(d)(i)  hereof) for the Trading Day immediately  prior to the date of
such  exercise.  

              (d) The  holder  of a  Right,  by the  acceptance  of such  Right,
expressly  waives such holder's  right to receive any  fractional  Rights or any
fractional  shares (other than, in the case of Preferred Stock,  fractions which
are integral multiples of one one-hundredths of a share of Preferred Stock) upon
exercise of a Right except as permitted by this Section 14. 

              Section 15. Rights of Action.

              All rights of action in respect  of this  Agreement  are vested in
the respective  registered holders of the Rights Certificates (and, prior to the
Distribution  Date,  the  registered  holders  of the  Common  Stock);  and  any
registered holder of any Rights Certificate (or, prior to the Distribution Date,
the registered  holders of the Common Stock),  without the consent of the Rights
Agent  or of the  holder  of any  other  Rights  Certificate  (or,  prior to the
Distribution  Date,  the registered  holders of the Common Stock),  may, in such
holder's behalf and for such holder's  benefit,  enforce,  and may institute and
maintain  any suit,  action or  proceeding  against the  Company to enforce,  or
otherwise  act in  respect  of,  such  holder's  right to  exercise  the  Rights
evidenced  by such  Rights  Certificate  (or,  prior to the  Distribution  Date,
certificates for Common Stock) in the manner provided in such Rights Certificate
and in this Agreement.  Without limiting the foregoing or any remedies available
to the holders of Rights,  it is specifically  acknowledged  that the holders of
Rights would not have an adequate remedy at law for any breach of this Agreement
and shall be entitled to specific  performance of the obligations  hereunder and
injunctive  relief  against actual or threatened  violations of the  obligations
hereunder  of any  Person  subject to this  Agreement.  

              Section 16. Agreement of Rights Holders.

              Every holder of a Right by accepting  the same consents and agrees
with the  Company and the Rights  Agent and with every  other  holder of a Right
that: 

              (a)  prior  to  the   Distribution   Date,   the  Rights  will  be
transferable  only in connection  with the transfer of Common Stock; 

                                       23


<PAGE>

              (b) after the  Distribution  Date,  the  Rights  Certificates  are
transferable  only on the registry  books of the Rights Agent if  surrendered at
the principal office or offices of the Rights Agent designated for such purpose,
duly  endorsed or  accompanied  by a proper  instrument of transfer and with the
appropriate forms and certificates fully executed;

              (c) subject to Section 6(a) and Section  7(f) hereof,  the Company
and the  Rights  Agent  may deem and treat  the  person  in whose  name a Rights
Certificate  (or, prior to the  Distribution  Date, the associated  Common Stock
certificate)  is  registered  as the  absolute  owner  thereof and of the Rights
evidenced thereby  (notwithstanding any notations of ownership or writing on the
Rights  Certificates or the associated  Common Stock  certificate made by anyone
other than the Company or the Rights  Agent) for all  purposes  whatsoever,  and
neither  the  Company  nor the Rights  Agent,  subject to the last  sentence  of
Section  7(e)  hereof,  shall be  required  to be  affected by any notice to the
contrary; and

              (d)  notwithstanding  anything in this  Agreement to the contrary,
neither the Company nor the Rights Agent shall have any  liability to any holder
of a Right or other  Person as a result of its  inability  to perform any of its
obligations  under this  Agreement  by reason of any  preliminary  or  permanent
injunction  or other  order,  decree  or ruling  issued by a court of  competent
jurisdiction  or by a  governmental,  regulatory  or  administrative  agency  or
commission,  or any statute,  rule, regulation or executive order promulgated or
enacted by any  governmental  authority,  prohibiting  or otherwise  restraining
performance of such obligation; provided, however, the Company must use its best
efforts to have any such order, decree or ruling lifted or otherwise  overturned
as soon as possible. 

              Section 17. Rights Certificate Holder Not Deemed a Shareholder.

              No holder, as such, of any Rights Certificate shall be entitled to
vote, receive dividends or be deemed for any purpose the holder of the number of
one  one-hundredths of a share of Preferred Stock or any other securities of the
Company  which  may at any  time  be  issuable  on the  exercise  of the  Rights
represented  thereby,  nor shall  anything  contained  herein  or in any  Rights
Certificate  be construed  to confer upon the holder of any Rights  evidenced by
either a certificate for Common Stock or by any Rights Certificate, as such, any
of the  rights  of a  shareholder  of the  Company  or any right to vote for the
election  of  directors  or upon any matter  submitted  to  shareholders  at any
meeting thereof,  or to give or withhold consent to any corporate  action, or to
receive notice of meetings or other actions  affecting  shareholders  (except as
provided in Section 25 hereof), or to receive dividends or subscription  rights,
or otherwise, until the Right or Rights evidenced by such certificate for Common
Stock or Rights  Certificate,  as the case may be, shall have been  exercised in
accordance with the provisions hereof.

              Section 18. Concerning the Rights Agent.

              (a)  The  Company   agrees  to  pay  to  the  Rights   Agent  such
compensation as shall be agreed to in writing between the Company and the Rights
Agent for all  services  rendered by it  hereunder  and,  from time to time,  on
demand of the  Rights  Agent,  its  reasonable  expenses  and  counsel  fees and
disbursements  and  other  disbursements  incurred  in  the  administration  and
execution  of this  Agreement  and the exercise  and  performance  of its duties
hereunder.  The Company  also agrees to  indemnify  the Rights Agent for, and to
hold it harmless  against,  any loss,  liability,  or expense,  incurred without
gross  negligence,  bad faith or

                                       24

<PAGE>

willful misconduct on the part of the Rights Agent, for anything done or omitted
by the Rights Agent in connection with the acceptance and administration of this
Agreement,  including  without  limitation  the costs and  expenses of defending
against any claim (whether  asserted by the Company,  a holder of Rights, or any
other Person) of liability in the premises, including reasonable attorney's fees
and expenses.  The provisions of this Section 18(a) shall survive the expiration
of the Rights and the termination of this Agreement.

              (b) The  Rights  Agent  shall  be  protected  and  shall  incur no
liability  for or in respect of any action  taken,  suffered or omitted by it in
connection with its administration of this Agreement in reliance upon any Rights
Certificate  or  certificate  for Common  Stock or for other  securities  of the
Company,  instrument of assignment or transfer, power of attorney,  endorsement,
affidavit,  letter,  notice,  instruction,   direction,   consent,  certificate,
statement,  or other paper or document  reasonably  believed by it to be genuine
and to be signed and  executed  by the proper  Person or  Persons.  

              Section 19.  Merger or  Consolidation  or Change of Name of Rights
Agent.

              (a) Any  corporation  into which the Rights Agent or any successor
Rights  Agent  may be  merged  or  with  which  it may be  consolidated,  or any
corporation resulting from any merger or consolidation to which the Rights Agent
or any successor Rights Agent shall be a party, or any corporation succeeding to
all or  substantially  all of the corporate trust or stock transfer  business of
the Rights Agent or any successor  Rights  Agent,  shall be the successor to the
Rights Agent under this  Agreement  without the execution or filing of any paper
or any further act on the part of any of the parties hereto; provided,  however,
that such  corporation  would be eligible for appointment as a successor  Rights
Agent  under the  provisions  of  Section  21  hereof.  In case at the time such
successor  Rights Agent shall succeed to the agency  created by this  Agreement,
any of the Rights  Certificates shall have been countersigned but not delivered,
any such successor Rights Agent may adopt the  countersignature of a predecessor
Rights Agent and deliver such Rights Certificates so countersigned;  and in case
at that time any of the Rights  Certificates shall not have been  countersigned,
any successor  Rights Agent may countersign such Rights  Certificates  either in
the name of the predecessor or in the name of the successor Rights Agent; and in
all such cases such Rights  Certificates  shall have the full force  provided in
the Rights Certificates and in this Agreement. 

              (b) In case at any  time  the name of the  Rights  Agent  shall be
changed  and at  such  time  any of the  Rights  Certificates  shall  have  been
countersigned but not delivered, the Rights Agent may adopt the countersignature
under its prior name and deliver Rights  Certificates so  countersigned;  and in
case  at  that  time  any  of  the  Rights  Certificates  shall  not  have  been
countersigned,  the Rights Agent may countersign such Rights Certificates either
in its prior name or in its  changed  name;  and in all such  cases such  Rights
Certificates  shall have the full force provided in the Rights  Certificates and
in this Agreement. 

              Section 20. Duties of Rights Agent.

              The Rights Agent  undertakes the duties and obligations  expressly
imposed by this  Agreement,  and no implied duties or obligations  shall be read
into this  Agreement  against the Rights  Agent,  upon the  following  terms and
conditions,  by all of which the Company and the holders of Rights Certificates,
by their acceptance thereof, shall be bound: 

                                       25


<PAGE>

              (a) The  Rights  Agent  may  consult  with  legal  counsel  of its
selection  (who may be legal counsel for the  Company),  and the opinion of such
counsel shall be full and complete  authorization  and  protection to the Rights
Agent as to any action  taken or  omitted by it in good faith and in  accordance
with such  opinion.  

              (b) Whenever in the performance of its duties under this Agreement
the Rights Agent shall deem it  necessary  or desirable  that any fact or matter
(including,  without  limitation,  the identity of any  Acquiring  Person or any
Affiliate or Associate  thereof and the determination of "current market price")
be proved or  established by the Company prior to taking or suffering any action
hereunder,  such fact or matter  (unless  other  evidence in respect  thereof be
herein  specifically  prescribed)  may be deemed to be  conclusively  proved and
established by a certificate signed by the Chairman of the Board, the President,
any Vice President, the Treasurer, any Assistant Treasurer, the Secretary or any
Assistant  Secretary of the Company and delivered to the Rights Agent;  and such
certificate shall be full authorization to the Rights Agent for any action taken
or  suffered  in good  faith by it under the  provisions  of this  Agreement  in
reliance  upon such  certificate.  

              (c) The Rights  Agent shall be liable  hereunder  only for its own
gross negligence,  bad faith or willful misconduct. 

              (d) The Rights  Agent  shall not be liable for or by reason of any
of the  statements  of fact or recitals  contained  in this  Agreement or in the
Rights  Certificates  or be  required  to  verify  the  same  (except  as to its
countersignature  on such  Rights  Certificates),  but all such  statements  and
recitals are and shall be deemed to have been made by the Company only.

              (e) The  Rights  Agent  shall not be under any  responsibility  in
respect of the validity of this  Agreement or the execution and delivery  hereof
(except  the due  execution  hereof by the  Rights  Agent) or in  respect of the
validity or execution  of any Rights  Certificate  (except its  countersignature
thereof);  nor shall it be  responsible  for any  breach by the  Company  of any
covenant or condition  contained in this Agreement or in any Rights Certificate;
nor shall it be responsible for any adjustment  required under the provisions of
Section  11,  Section  13 or Section 24 hereof or  responsible  for the  manner,
method or amount of any such adjustment or the  ascertaining of the existence of
facts  that  would  require  any such  adjustment  (except  with  respect to the
exercise of Rights  evidenced by Rights  Certificates  after the Rights  Agent's
actual  notice of any such  adjustment);  nor shall it by any act  hereunder  be
deemed  to make  any  representation  or  warranty  as to the  authorization  or
reservation  of any  shares  of  Common  Stock or  Preferred  Stock to be issued
pursuant to this Agreement or any Rights Certificate or as to whether any shares
of Common Stock or Preferred Stock will, when so issued,  be validly  authorized
and  issued,  fully  paid and  nonassessable,  nor  shall  the  Rights  Agent be
responsible  for  the  legality  of  the  terms  hereof  in its  capacity  as an
administrative  agent.  

              (f) The Company agrees that it will perform, execute,  acknowledge
and deliver or cause to be performed,  executed,  acknowledged and delivered all
such further and other acts,  instruments  and  assurances as may  reasonably be
required by the Rights Agent for the carrying  out or  performing  by the Rights
Agent of the provisions of this Agreement.

                                       26

<PAGE>

              (g) The Rights Agent is hereby  authorized  and directed to accept
instructions  with respect to the  performance of its duties  hereunder from the
Chairman of the Board,  the President,  any Vice President,  the Treasurer,  any
Assistant  Treasurer,  the Secretary or any Assistant  Secretary of the Company,
and to apply to such officers for advice or  instructions in connection with its
duties,  and it shall not be liable for any action taken or suffered to be taken
by it in good faith in accordance  with  instructions  of any such officer.  Any
application by the Rights Agent for written  instructions  from the Company may,
at the option of the Rights Agent,  set forth in writing any action  proposed to
be taken or omitted by the Rights  Agent  under this  Agreement  and the date on
and/or  after  which  such  action  shall  be taken  or such  omission  shall be
effective.  The Rights  Agent  shall not be liable  for any action  taken by, or
omission of, the Rights  Agent in  accordance  with a proposal  included in such
application on or after the date specified in such application (which date shall
not be less than five  Business  Days after the date any  officer of the Company
actually receives such application, unless any such officer shall have consented
in writing to any earlier  date)  unless prior to taking any such action (or the
effective date in the case of an omission), the Rights Agent shall have received
written instructions in response to such application specifying the action to be
taken or omitted. 

              (h) The Rights  Agent and any  shareholder,  director,  officer or
employee of the Rights Agent may buy, sell or deal in any of the Rights or other
securities of the Company or become pecuniarily interested in any transaction in
which the  Company  may be  interested,  or  contract  with or lend money to the
Company or otherwise  act as fully and freely as though it were not Rights Agent
under this Agreement. Nothing herein shall preclude the Rights Agent from acting
in any other  capacity  for the  Company or for any other  legal  entity.  

              (i) The Rights Agent may execute and exercise any of the rights or
powers hereby vested in it or perform any duty hereunder  either itself or by or
through its attorneys or agents, and the Rights Agent shall not be answerable or
accountable for any act, default, neglect or misconduct of any such attorneys or
agents or for any loss to the  Company  resulting  from any such  act,  default,
neglect or misconduct;  provided,  however, reasonable care was exercised in the
selection and continued  employment  thereof.  

              (j) No provision of this Agreement  shall require the Rights Agent
to expend or risk its own funds or otherwise  incur any  financial  liability in
the performance of any of its duties  hereunder or in the exercise of its rights
if there shall be reasonable  grounds for believing that repayment of such funds
or adequate  indemnification  against such risk or  liability is not  reasonably
assured to it. 

              (k) If, with respect to any Rights Certificate  surrendered to the
Rights Agent for exercise or transfer,  split up,  combination or exchange,  the
certificate  attached to the form of assignment or form of election to purchase,
as the case may be, has either not been  completed or  indicates an  affirmative
response  to clause 1 and/or 2  thereof,  the  Rights  Agent  shall not take any
further action with respect to such requested exercise or transfer without first
consulting  with the Company.  

              (l) In  addition  to the  foregoing,  the  Rights  Agent  shall be
protected  and shall incur no liability  for, or in respect of, any action taken
or omitted by it in connection with its administration of this Agreement if such
acts  or  omissions  are in  reliance  upon  (i)  the  proper  execution  of the
certification  appended  to the form of  assignment  and the form of election to

                                       27


<PAGE>

purchase  attached  hereto  unless the Rights Agent shall have actual  knowledge
that, as executed,  such  certification is untrue,  or (ii) the non-execution of
such  certification  including,  without  limitation,  any  refusal to honor any
otherwise permissible assignment or election by reason of such non-execution.  

              (m) The Company  agrees to give the Rights  Agent  prompt  written
notice of any event or ownership  which would  prohibit the exercise or transfer
of the Rights Certificates. 

              Section 21. Change of Rights Agent.

              The Rights Agent or any  successor  Rights Agent may resign and be
discharged from its duties under this Agreement upon thirty (30) days' notice in
writing  mailed to the  Company.  The Company may remove the Rights Agent or any
successor  Rights Agent upon thirty (30) days' notice in writing,  mailed to the
Rights Agent or successor Rights Agent, as the case may be, and to each transfer
agent of the Common Stock and Preferred  Stock, by registered or certified mail,
and to the holders of the Rights Certificates by first-class mail. If the Rights
Agent shall resign or be removed or shall otherwise  become incapable of acting,
the Company shall appoint a successor to the Rights Agent.  If the Company shall
fail to make such  appointment  within a period of thirty (30) days after giving
notice  of such  removal  or after  it has  been  notified  in  writing  of such
resignation or incapacity by the resigning or  incapacitated  Rights Agent or by
the holder of a Rights  Certificate  (who shall,  with such notice,  submit such
holder's  Rights  Certificate  for  inspection by the Company),  then the Rights
Agent or any registered holder of any Rights  Certificate may, at the expense of
the Company, apply to any court of competent jurisdiction for the appointment of
a new Rights Agent. Any successor Rights Agent, whether appointed by the Company
or by such a court,  shall be either (a) a corporation  or other legal  business
entity  organized and doing  business  under the laws of the United States or of
any State  thereof,  in good  standing,  which is authorized  under such laws to
exercise  corporate trust or stock transfer powers and is subject to supervision
or  examination  by federal or state  authority and which has at the time of its
appointment  as  Rights  Agent  a  combined  capital  and  surplus  of at  least
$100,000,000 or (b) an affiliate of a corporation or other legal business entity
described  in clause (a) of this  sentence.  After  appointment,  the  successor
Rights  Agent  shall  be  vested  with  the  same  powers,  rights,  duties  and
responsibilities  as if it had been  originally  named as Rights  Agent  without
further act or deed; but the predecessor Rights Agent shall deliver and transfer
to the successor Rights Agent any property at the time held by it hereunder, and
execute and deliver any further assurance, conveyance, act or deed necessary for
the purpose.  Not later than the  effective  date of any such  appointment,  the
Company shall file notice thereof in writing with the  predecessor  Rights Agent
and each transfer agent of the Common Stock and the Preferred  Stock, and mail a
notice thereof in writing to the registered  holders of the Rights  Certificates
or, if prior to the  Distribution  Date,  to the  registered  holders  of Common
Stock.  Failure to give any notice provided for in this Section 21, however,  or
any defect therein, shall not affect the legality or validity of the resignation
or removal of the Rights Agent or the appointment of the successor Rights Agent,
as the case may be.

              Section 22. Issuance of New Rights Certificates.

              Notwithstanding  any of the provisions of this Agreement or of the
Rights Certificates to the contrary,  the Company may, at its option,  issue new
Rights  Certificates  evidencing  Rights in such form as may be  approved by the
Board of Directors to reflect any 

                                       28


<PAGE>

adjustment  or change in the  Purchase  Price and the number or kind or class of
shares or other securities or property purchasable under the Rights Certificates
made in  accordance  with the  provisions  of this  Agreement.  In addition,  in
connection  with the  issuance or sale of shares of Common Stock  following  the
Distribution  Date and prior to the redemption or expiration of the Rights,  the
Company  (a) shall,  with  respect  to shares of Common  Stock so issued or sold
pursuant  to the  exercise  of stock  options  or  under  any  employee  plan or
arrangement,  granted  or  awarded  as of the  Distribution  Date,  or upon  the
exercise, conversion or exchange of securities issued by the Company hereinafter
but prior to the  Distribution  Date,  and (b) may, in any other case, if deemed
necessary or appropriate by the Board of Directors of the Company,  issue Rights
Certificates  representing  the appropriate  number of Rights in connection with
such issuance or sale;  provided,  however,  that (i) no such Rights Certificate
shall be issued if,  and to the extent  that,  the  Company  shall be advised by
counsel that such issuance would create a significant  risk of material  adverse
tax  consequences  to the Company or the Person to whom such Rights  Certificate
would be issued,  and (ii) no such Rights Certificate shall be issued if, and to
the extent that,  appropriate  adjustment shall otherwise have been made in lieu
of the issuance thereof.

              Section 23. Redemption and Termination.

              (a) Subject to Section 27 hereof,  the Board of  Directors  of the
Company  may,  at its  option,  at any time on or before the  earlier of (i) the
close of business on the tenth Business Day following the Stock Acquisition Date
(or, if the Stock Acquisition Date shall have occurred prior to the Record Date,
the close of business on the tenth  Business Day following the Record Date),  or
(ii) the  Final  Expiration  Date,  redeem  all but not  less  than all the then
outstanding  Rights at a redemption  price of $.01 per Right, as such amount may
be appropriately  adjusted to reflect any stock split, stock dividend or similar
transaction  occurring  after  the date  hereof  (such  redemption  price  being
hereinafter  referred to as the "Redemption  Price").  Notwithstanding  anything
contained in this Agreement to the contrary, the Rights shall not be exercisable
after the first  occurrence of a Section  11(a)(ii) Event until such time as the
Company's  right of redemption  hereunder  has expired.  The Company may, at its
option,  pay the Redemption Price in cash,  shares of Common Stock (based on the
"current  market price," as defined in Section  11(d)(i)  hereof,  of the Common
Stock at the time of  redemption)  or any other  form of  consideration,  or any
combination  of  any of the  foregoing,  deemed  appropriate  by  the  Board  of
Directors of the Company.

              (b)  Immediately  upon the action of the Board of Directors of the
Company ordering the redemption of the Rights, evidence of which shall have been
filed with the Rights  Agent and  without  any  further  action and  without any
notice,  the right to  exercise  the Rights  will  terminate  and the only right
thereafter of the holders of Rights shall be to receive the Redemption Price for
each Right so held. Promptly after the action of the Board of Directors ordering
the redemption of the Rights,  the Company shall give notice of such  redemption
to the Rights  Agent and the holders of the then  outstanding  Rights by mailing
such notice to all such holders at each holder's last address as it appears upon
the registry  books of the Rights Agent or, prior to the  Distribution  Date, on
the registry books of the transfer agent for the Common Stock.  Any notice which
is mailed in the manner herein  provided  shall be deemed given,  whether or not
the holder  receives the notice.  Each such notice of redemption  will state the
method by which the payment of the Redemption Price will be made.

                                       29

<PAGE>

              Section 24. Exchange.

              (a) The Board of Directors  of the Company may, at its option,  at
any time after any Person becomes an Acquiring  Person,  exchange all or part of
the then outstanding and exercisable Rights (which shall not include Rights that
have become void  pursuant to the  provisions of Section 7(e) hereof) for Common
Stock at an exchange ratio of one share of Common Stock per Right, appropriately
adjusted  to reflect any stock  split,  stock  dividend  or similar  transaction
occurring after the date hereof (such exchange ratio being hereinafter  referred
to as the  "Exchange  Ratio").  Notwithstanding  the  foregoing,  the  Board  of
Directors of the Company  shall not be empowered to effect such  exchange at any
time after any Person  (other than the Company,  any  Subsidiary of the Company,
any employee benefit plan of the Company or any such  Subsidiary,  or any entity
holding  Common  Stock for or pursuant to the terms of any such plan),  together
with all Affiliates and Associates of such Person,  becomes the Beneficial Owner
of fifty percent (50%) or more of the Common Stock then outstanding.

              (b)  Immediately  upon the action of the Board of Directors of the
Company  ordering the exchange of any Rights  pursuant to subsection (a) of this
Section 24 and without any further  action and without any notice,  the right to
exercise such Rights shall  terminate and the only right  thereafter of a holder
of such Rights  shall be to receive  that number of shares of Common Stock equal
to the number of such  Rights  held by such holder  multiplied  by the  Exchange
Ratio.  The Company  shall  promptly  give public  notice of any such  exchange;
provided, however, that the failure to give, or any defect in, such notice shall
not affect the  validity of such  exchange.  The Company  promptly  shall mail a
notice of any such  exchange  to all of the holders of such Rights at their last
addresses  as they appear upon the  registry  books of the  Company.  Any notice
which is mailed in the manner herein provided shall be deemed given,  whether or
not the holder receives the notice.  Each such notice of exchange will state the
method by which the  exchange  of the Common  Stock for Rights  will be effected
and, in the event of any partial  exchange,  the number of Rights  which will be
exchanged.  Any partial  exchange shall be effected pro rata based on the number
of Rights (other than Rights which have become void  pursuant to the  provisions
of Section 7(e) hereof) held by each holder of Rights.

              (c) In any exchange  pursuant to this Section 24, the Company,  at
its option,  may substitute  Preferred Stock (or equivalent  preferred stock, as
such term is defined in  paragraph  (b) of Section 11 hereof)  for Common  Stock
exchangeable for Rights, at the initial rate of one one-hundredths of a share of
Preferred Stock (or equivalent  preferred stock) for each share of Common Stock,
as  appropriately  adjusted to reflect  stock splits,  stock  dividends or other
similar transactions effected after the date hereof.

              (d) In the event that there shall not be  sufficient  Common Stock
issued but not  outstanding or authorized but unissued to permit any exchange of
Rights as  contemplated  in  accordance  with this Section 24, the Company shall
take all such  action as may be  necessary  to  authorize  additional  shares of
Common Stock for issuance upon exchange of the Rights.

              (e) The Company shall not be required to issue fractions of shares
of Common Stock or to distribute  certificates which evidence  fractional shares
of Common Stock. In lieu of such fractional shares of Common Stock,  there shall
be paid to the registered holders of the Right Certificates with regard to which
such fractional shares of Common Stock would otherwise be issuable, an amount in
cash equal to the same fraction of the current market

                                       30

<PAGE>

value of a whole share of Common Stock. For the purposes of this subsection (e),
the current  market  value of a whole share of Common Stock shall be the closing
price of a share of Common  Stock (as  determined  pursuant to Section  11(d)(i)
hereof) for the Trading Day immediately  prior to the date of exchange  pursuant
to this Section 24.

              Section 25. Notice of Certain Events.

              (a) In case the  Company  shall  propose,  at any time  after  the
Distribution  Date, (i) to pay any dividend payable in stock of any class to the
holders of Preferred  Stock or to make any other  distribution to the holders of
Preferred Stock (other than a regular quarterly cash dividend out of earnings or
retained earnings of the Company),  or (ii) to offer to the holders of Preferred
Stock rights or warrants to subscribe for or to purchase any  additional  shares
of  Preferred  Stock or shares  of stock of any  class or any other  securities,
rights or  options,  or (iii) to effect any  reclassification  of its  Preferred
Stock  (other  than  a  reclassification   involving  only  the  subdivision  of
outstanding  shares of Preferred  Stock), or (iv) to effect any consolidation or
merger into or with any other Person  (other than a Subsidiary of the Company in
a transaction  which complies with Section 11(o) hereof),  or to effect any sale
or other  transfer (or to permit one or more of its  Subsidiaries  to effect any
sale or other transfer), in one transaction or a series of related transactions,
of more than fifty  percent  (50%) of the assets,  earning power or cash flow of
the  Company  and its  Subsidiaries  (taken as a whole)  to any other  Person or
Persons  (other than the Company and/or any of its  Subsidiaries  in one or more
transactions each of which complies with Section 11(o) hereof), or (v) to effect
the  liquidation,  dissolution or winding up of the Company,  then, in each such
case, the Company shall give to each holder of a Rights  Certificate  and to the
Rights Agent, to the extent feasible and in accordance with Section 26 hereof, a
notice of such  proposed  action,  which  shall  specify the record date for the
purposes of such stock dividend, distribution of rights or warrants, or the date
on  which  such   reclassification,   consolidation,   merger,  sale,  transfer,
liquidation,  dissolution,  or  winding  up is to take  place  and  the  date of
participation  therein by the holders of the shares of Preferred  Stock,  if any
such date is to be fixed,  and such notice  shall be so given in the case of any
action  covered by clause (i) or (ii) above at least  twenty  (20) days prior to
the record date for  determining  holders of the shares of  Preferred  Stock for
purposes  of such  action,  and in the case of any such other  action,  at least
twenty (20) days prior to the date of the taking of such proposed  action or the
date of  participation  therein by the holders of the shares of Preferred  Stock
whichever shall be the earlier.

              (b) In case any Section 11(a)(ii) Event shall occur,  then, in any
such case, (i) the Company shall as soon as practicable  thereafter give to each
holder of a Rights  Certificate  and to the Rights Agent, to the extent feasible
and in  accordance  with Section 26 hereof,  a notice of the  occurrence of such
event,  which  shall  specify  the  event and the  consequences  of the event to
holders of Rights under Section 11(a)(ii) hereof, and (ii) all references in the
preceding  paragraph to Preferred  Stock shall be deemed  thereafter to refer to
Common Stock and/or, if appropriate,  other securities issuable upon exercise of
the Rights.

              Section 26. Notices.

              Notices or demands  authorized  by this  Agreement  to be given or
made by the Rights  Agent or by the holder of any Rights  Certificates  to or on
the Company shall be  sufficiently  given or made if sent by  first-class  mail,
postage  prepaid,  addressed (until another address is filed in writing with the
Rights Agent) as follows:

                                       31

<PAGE>

              KeySpan Energy
              One Metro Tech Center
              Brooklyn, New York  11201
              Attention:  Secretary

Subject to the provisions of Section 21 hereof,  any notice or demand authorized
by this  Agreement  to be given or made by the  Company  or by the holder of any
Rights  Certificates  to or on the Rights Agent shall be  sufficiently  given or
made if sent by first-class  mail,  postage  prepaid,  addressed  (until another
address is filed in writing with the Company) as follows:

              The Bank of New York
              101 Barclay Street 12 West
              New York, New York  10286
              Attention:  Stock Transfer Department

Notices  or  demands  authorized  by this  Agreement  to be given or made by the
Company or the Rights  Agent to the holder of any  Rights  Certificate  (or,  if
prior to the  Distribution  Date,  to the  holder of  certificates  representing
shares  of  Common  Stock)  shall  be  sufficiently  given  or  made  if sent by
first-class  mail,  postage prepaid,  addressed to such holder at the address of
such holder as shown on the registry books of the Company.

              Section 27. Supplements and Amendments.

              Prior to the  Distribution  Date, the Company and the Rights Agent
shall,  if the Company so directs,  supplement  or amend any  provision  of this
Agreement  without  the  approval of any  holders of  certificates  representing
shares of Common Stock.  From and after the  Distribution  Date, the Company and
the Rights  Agent  shall,  if the Company so directs,  supplement  or amend this
Agreement  without the approval of any holders of Rights  Certificates  in order
(i) to cure any ambiguity, (ii) to correct or supplement any provision contained
herein which may be defective or inconsistent with any other provisions  herein,
(iii) to shorten or  lengthen  any time  period  hereunder  or (iv) to change or
supplement  the  provisions  hereunder  in any manner which the Company may deem
necessary or desirable and which shall not adversely affect the interests of the
holders of Rights Certificates;  provided, from and after the Distribution Date,
this  Agreement may not be  supplemented  or amended to lengthen any time period
hereunder  pursuant to clause (iii) of this sentence unless such  lengthening is
for the purpose of protecting, enhancing or clarifying the rights of, and/or the
benefits to, the holders of Rights.  Upon the delivery of a certificate  from an
appropriate  officer of the Company which states that the proposed supplement or
amendment is in  compliance  with the terms of this Section 27, the Rights Agent
shall execute such supplement or amendment.  Prior to the Distribution Date, the
interests of the holders of Rights shall be deemed coincident with the interests
of the holders of Common Stock. Notwithstanding anything contained herein to the
contrary,  this  Agreement  may not be amended at a time when the Rights are not
redeemable.  Notwithstanding  any other  provision  hereof,  the Rights  Agent's
consent must be obtained regarding any amendment or supplement  pursuant to this
Section 27 which alters the Rights Agent's rights or duties.

                                       32

<PAGE>

              Section 28. Successors.

              All the covenants and  provisions of this  Agreement by or for the
benefit of the  Company or the Rights  Agent shall bind and inure to the benefit
of their respective successors and assigns hereunder.


              Section 29.  Determinations and Actions by the Board of Directors,
etc.

              For all purposes of this Agreement,  any calculation of the number
of shares of Common Stock  outstanding  at any  particular  time,  including for
purposes of determining the particular  percentage of such outstanding shares of
Common  Stock of which any  Person  is the  Beneficial  Owner,  shall be made in
accordance with Section 912 of the NYBCL.  The Board of Directors of the Company
shall have the exclusive power and authority to administer this Agreement and to
exercise all rights and powers specifically granted to the Board of Directors of
the  Company,  or the  Company,  or as  may be  necessary  or  advisable  in the
administration of this Agreement,  including,  without limitation, the right and
power to (i)  interpret  the  provisions  of this  Agreement,  and (ii) make all
determinations  deemed  necessary or advisable  for the  administration  of this
Agreement  including  a  determination  to redeem or not redeem the Rights or to
amend  the  Agreement).  All such  actions,  calculations,  interpretations  and
determinations (including, for purposes of clause (ii) below, all omissions with
respect to the  foregoing)  which are done or made by the Board of  Directors of
the Company in good  faith,  shall (i) be final,  conclusive  and binding on the
Company,  the Rights Agent, the holders of the Rights and all other parties, and
(ii) not subject the Board of Directors  of the Company to any  liability to the
holders of the Rights.

              Section 30. Benefits of this Agreement.

              Nothing in this Agreement shall be construed to give to any Person
other than the  Company,  the  Rights  Agent and the  registered  holders of the
Rights Certificates (and, prior to the Distribution Date,  registered holders of
the  Common  Stock) any legal or  equitable  right,  remedy or claim  under this
Agreement; but this Agreement shall be for the sole and exclusive benefit of the
Company,  the Rights Agent and the registered holders of the Rights Certificates
(and, prior to the Distribution Date, registered holders of the Common Stock).

              Section 31. Severability.

              If any term, provision,  covenant or restriction of this Agreement
is held by a court of competent  jurisdiction  or other authority to be invalid,
void or  unenforceable,  the remainder of the terms,  provisions,  covenants and
restrictions  of this Agreement  shall remain in full force and effect and shall
in no  way  be  affected,  impaired  or  invalidated;  provided,  however,  that
notwithstanding  anything in this  Agreement to the contrary,  if any such term,
provision,  covenant or  restriction  is held by such court or  authority  to be
invalid,  void or  unenforceable  and the  Board  of  Directors  of the  Company
determines  in its good  faith  judgment  that  severing  the  invalid,  void or
unenforceable language from this Agreement would adversely affect the purpose or
effect of this Agreement, the right of redemption set forth in Section 23 hereof
shall be  reinstated  and shall not expire  until the close of  business  on the
tenth day following the date of such  determination by the Board of Directors of
the Company. 

                                       33

<PAGE>

              Section 32. Governing Law.

              This  Agreement,  each Right and each  Rights  Certificate  issued
hereunder  shall be deemed to be a contract  made under the laws of the State of
New York and for all purposes  shall be governed by and  construed in accordance
with the laws of such State  applicable  to  contracts  made and to be performed
entirely within such State. 

              Section 33. Counterparts.

              This  Agreement  may be executed in two  counterparts  and each of
such counterparts  shall for all purposes be deemed to be an original,  and both
such counterparts shall together constitute but one and the same instrument.  

              Section 34. Descriptive Headings.

              Descriptive headings of the several Sections of this Agreement are
inserted  for  convenience  only and shall not  control or affect the meaning or
construction of any of the provisions hereof.

               [THE BALANCE OF THIS PAGE INTENTIONALLY LEFT BLANK]









                                       34
<PAGE>

              IN WITNESS  WHEREOF,  the  parties  hereto have caused this Rights
Agreement to be duly executed as of the day and year first above written.

                                         MARKETSPAN CORPORATION,
                                          doing business as KeySpan Energy



                                         By /s/ Craig G. Matthews
                                           ------------------------------------
                                            Name:  Craig G. Matthews
                                            Title:  President and Chief
                                                    Operating Officer



                                         THE BANK OF NEW YORK, as Rights Agent



                                         By /s/ Jeffrey Grosse
                                           ------------------------------------
                                            Name:  Jeffrey Grosse
                                            Title:  Vice President



<PAGE>


                                                                       EXHIBIT A

                            CERTIFICATE OF AMENDMENT

                                     OF THE

                          CERTIFICATE OF INCORPORATION

                                       OF

                             MARKETSPAN CORPORATION


                Under Section 805 of the Business Corporation Law
                            of the State of New York


                                 --------------



              MarketSpan Corporation, a corporation organized and existing under
the laws of the State of New York (the  "Corporation"),  does hereby  certify as
follows:

              FIRST:   The  present  name  of  the   Corporation  is  MarketSpan
Corporation. The Corporation was formed under the name "BL Holding Corp."

              SECOND:  The Certificate of  Incorporation  of the Corporation was
filed with the New York  Department of State on April 16, 1998.  Certificates of
Amendment  of the  Certificate  of  Incorporation  were  filed with the New York
Department of State on May 26, 1998 and June 1, 1998.

              THIRD:  The amendment of the Certificate of  Incorporation  of the
Corporation effected by this Certificate of Amendment is as follows:

              To  add  provisions  stating  the  number,  designation,  relative
              rights,  preferences and limitations of the shares of the Series D
              Preferred  Stock,  as  fixed  by the  Board  of  Directors  of the
              Corporation.

              FOURTH: To accomplish the foregoing  amendment,  Article IV of the
Certificate of Incorporation  of the Corporation,  relating to the capital stock
of the Corporation, is hereby amended as follows:

              A Part D shall be  inserted at the end of Section 5 of Article IV,
and such Part D shall read in its entirety as follows:

<PAGE>
              "PART D    SERIES D PREFERRED STOCK

              Section 1. Designation and Amount. Two million  (2,000,000) shares
of Preferred Stock, par value $.01 per share, are hereby  designated as Series D
Preferred Stock (the "Series D Preferred  Stock").  Such number of shares may be
increased or decreased by resolution of the Board of Directors; provided that no
decrease  shall  reduce  the number of shares of Series D  Preferred  Stock to a
number less than the number of shares then outstanding plus the number of shares
reserved  for  issuance  upon the  exercise of  outstanding  options,  rights or
warrants or upon the  conversion  of any  outstanding  securities  issued by the
Corporation convertible into Series D Preferred Stock.

              Section 2. Dividends and Distributions.

              (A) Subject to the prior and superior rights of the holders of any
shares of any series of Preferred Stock (or any similar stock) ranking prior and
superior to the shares of Series D Preferred  Stock with  respect to  dividends,
the holders of shares of Series D Preferred  Stock in  preference to the holders
of Common Stock, par value $0.01 per share (the "Common Stock"), or of any other
junior  stock,  shall be entitled to  receive,  when,  as and if declared by the
Board of Directors  out of funds legally  available  for the purpose,  quarterly
dividends  payable  in cash on the  first  day of  March,  June,  September  and
December in each year (each such date being  referred to herein as a  "Quarterly
Dividend Payment Date"), commencing on the first Quarterly Dividend Payment Date
after the first issuance of a share or fraction of a share of Series D Preferred
Stock, in an amount per share (rounded to the nearest cent) equal to the greater
of (a) $1.00 or (b) subject to the  provision  for  adjustment  hereinafter  set
forth,  one  hundred  (100)  times the  aggregate  per share  amount of all cash
dividends,  and one hundred (100) times the aggregate per share amount  (payable
in kind) of all non-cash dividends or other  distributions other than a dividend
payable in shares of Common Stock or a subdivision of the outstanding  shares of
Common Stock (by  reclassification  or otherwise),  declared on the Common Stock
since the  immediately  preceding  Quarterly  Dividend  Payment  Date,  or, with
respect to the first Quarterly  Dividend  Payment Date, since the first issuance
of any share or fraction of a share of Series D  Preferred  Stock.  In the event
the Corporation shall at any time after March 30, 1999 (the "Rights  Declaration
Date") (i) declare any dividend on the Common Stock  payable in shares of Common
Stock,  (ii)  subdivide  the  outstanding  Common  Stock,  or (iii)  combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount to which holders of shares of Series D Preferred  Stock were entitled
immediately prior to such event under clause (b) of the preceding sentence shall
be adjusted by multiplying such amount by a fraction,  the numerator of which is
the number of shares of Common Stock  outstanding  immediately  after such event
and the  denominator  of which is the number of shares of Common Stock that were
outstanding  immediately  prior to such event. 

              (B) The  Corporation  shall declare a dividend or  distribution on
the Series D  Preferred  Stock as provided in  Paragraph  (A) above  immediately
after it declares a dividend or  distribution  on the Common Stock (other than a
dividend  payable in shares of Common  Stock);  provided  that,  in the event no
dividend or distribution shall have been declared on the Common Stock during the
period  between any  Quarterly  Dividend  Payment  Date and the next  subsequent
Quarterly  Dividend  Payment Date, a dividend of $1.00 per share on the 

<PAGE>

Series D  Preferred  Stock  shall  nevertheless  be payable  on such  subsequent
Quarterly Dividend Payment Date.

              (C)  Dividends   shall  begin  to  accrue  and  be  cumulative  on
outstanding  shares of Series D  Preferred  Stock  from the  Quarterly  Dividend
Payment  Date  next  preceding  the  date of issue of such  shares  of  Series D
Preferred Stock,  unless the date of issue of such shares is prior to the record
date for the first Quarterly  Dividend  Payment Date, in which case dividends on
such  shares  shall begin to accrue  from the date of issue of such  shares,  or
unless the date of issue is a Quarterly Dividend Payment Date or is a date after
the record date for the determination of holders of shares of Series D Preferred
Stock  entitled  to  receive a  quarterly  dividend  and before  such  Quarterly
Dividend  Payment Date, in either of which events such dividends  shall begin to
accrue and be cumulative from such Quarterly  Dividend Payment Date. Accrued but
unpaid dividends shall not bear interest. Dividends paid on the shares of Series
D Preferred  Stock in an amount less than the total amount of such  dividends at
the time  accrued and payable on such shares  shall be  allocated  pro rata on a
share-by-share basis among all such shares at the time outstanding. The Board of
Directors  may fix a record date for the  determination  of holders of shares of
Series  D  Preferred  Stock  entitled  to  receive  payment  of  a  dividend  or
distribution  declared  thereon,  which record date shall be no more than thirty
(30) days prior to the date fixed for the payment thereof.

              Section  3.  Voting  Rights.  The  holders  of  shares of Series D
Preferred Stock shall have the following voting rights:

              (A) Subject to the provision for adjustment hereinafter set forth,
each share of Series D Preferred  Stock shall entitle the holder  thereof to one
hundred (100) votes on all matters  submitted to a vote of the  shareholders  of
the Corporation. In the event the Corporation shall at any time after the Rights
Declaration  Date (i) declare any dividend on the Common Stock payable in shares
of Common Stock,  (ii) subdivide the outstanding  Common Stock, or (iii) combine
the outstanding Common Stock into a smaller number of shares,  then in each such
case the  number  of votes  per  share to which  holders  of  shares of Series D
Preferred Stock were entitled  immediately prior to such event shall be adjusted
by multiplying  such number by a fraction,  the numerator of which is the number
of shares of Common  Stock  outstanding  immediately  after  such  event and the
denominator  of which is the  number  of  shares  of  Common  Stock  outstanding
immediately prior to such event.

              (B) Except as otherwise  provided herein or by law, the holders of
shares of Series D Preferred Stock and the holders of shares of Common Stock and
any other capital stock of the  corporation  having  general voting rights shall
vote together as one class on all matters submitted to a vote of shareholders of
the Corporation.  

              (C) (i) If at any time  dividends on any Series D Preferred  Stock
shall be in arrears in an amount equal to six (6) quarterly  dividends  thereon,
the occurrence of such contingency  shall mark the beginning of a period (herein
called a "default  period")  which shall extend until such time when all accrued
and unpaid  dividends for all previous  quarterly  dividend  periods and for the
current quarterly dividend period on all shares of Series D Preferred Stock then
outstanding  shall have been declared and paid or set apart for payment.  During
each default period,  all holders of Preferred Stock  (including  holders of the
Series D Preferred  Stock) with  dividends  in arrears in an amount equal to six
(6) quarterly  dividends  thereon,  voting as a class,  irrespective  of series,
shall have the right to elect two (2) Directors.

<PAGE>

                  (ii) During any  default  period,  such  voting  rights of the
holders of Series D  Preferred  Stock may be  exercised  initially  at a special
meeting  called  pursuant to  subparagraph  (iii) of this Section 3(C) or at any
annual  meeting  of   shareholders,   and  thereafter  at  annual   meetings  of
shareholders,  provided  that  neither  such  voting  right nor the right of the
holders of any other series of Preferred Stock, if any, to increase,  in certain
cases, the authorized  number of Directors shall be exercised unless the holders
of ten percent (10%) in number of shares of Preferred Stock outstanding shall be
present in person or by proxy.  The absence of a quorum of the holders of Common
Stock shall not affect the  exercise by the holders of  Preferred  Stock of such
voting  right.  At any  meeting at which the  holders of  Preferred  Stock shall
exercise such voting right initially  during an existing  default  period,  they
shall  have the  right,  voting  as a class,  to elect  Directors  to fill  such
vacancies,  if any,  in the Board of  Directors  as may then exist up to two (2)
Directors or, if such right is exercised at an annual meeting,  to elect two (2)
Directors. If the number which may be so elected at any special meeting does not
amount to the required number, the holders of the Preferred Stock shall have the
right to make such  increase in the number of Directors as shall be necessary to
permit the  election by them of the  required  number.  After the holders of the
Preferred  Stock  shall have  exercised  their right to elect  Directors  in any
default  period  and  during  the  continuance  of such  period,  the  number of
Directors  shall not be increased or decreased  except by vote of the holders of
Preferred  Stock as herein  provided  or  pursuant  to the  rights of any equity
securities ranking senior to or pari passu with the Series D Preferred Stock.

                  (iii) Unless the holders of Preferred  Stock shall,  during an
existing  default  period,  have  previously  exercised  their  right  to  elect
Directors,  the Board of Directors may order, or any shareholder or shareholders
owning in the  aggregate  not less than ten percent (10%) of the total number of
shares of Preferred Stock outstanding,  irrespective of series, may request, the
calling of a special  meeting of the holders of Preferred  Stock,  which meeting
shall  thereupon be called by the Chairman of the Board or the  President of the
Corporation.  Notice of such meeting and of any annual  meeting at which holders
of Preferred  Stock are  entitled to vote  pursuant to this  Paragraph  (C)(iii)
shall be given to each holder of record of Preferred  Stock by mailing a copy of
such notice to him at his last  address as the same  appears on the books of the
Corporation.  Such  meeting  shall be called for a time not earlier  than twenty
(20) days and not later than sixty (60) days after such order or  request,  such
meeting  may be called on  similar  notice by any  shareholder  or  shareholders
owning in the  aggregate  not less than ten percent (10%) of the total number of
shares of Preferred Stock  outstanding.  Notwithstanding  the provisions of this
Paragraph  (C)(iii),  no such special  meeting shall be called during the period
within sixty (60) days immediately  preceding the date fixed for the next annual
meeting of the shareholders.

                  (iv) In any default period,  the holders of Common Stock,  and
other classes of stock of the Corporation,  if applicable,  shall continue to be
entitled to elect the whole number of  Directors  until the holders of Preferred
Stock shall have  exercised  their right to elect two (2) Directors  voting as a
class,  after the  exercise of which right (x) the  Directors  so elected by the
holders of Preferred Stock shall continue in office until their successors shall
have been elected by such holders or until the expiration of the default period,
and (y) any  vacancy  in the Board of  Directors  may  (except  as  provided  in
Paragraph  (C)(ii) of this  Section  3) be filled by vote of a  majority  of the
remaining  Directors  theretofore  elected by the  holders of the class of stock
which elected the Director whose office shall have become vacant.  References in
this Paragraph (C) to Directors  elected by the holders of a particular

<PAGE>

class of  stock  shall  include  Directors  elected  by such  Directors  to fill
vacancies as provided in clause (y) of the foregoing sentence.

                  (v) Immediately  upon the expiration of a default period,  (x)
the right of the holders of Preferred  Stock as a class to elect Directors shall
cease,  (y) the term of any Directors  elected by the holders of Preferred Stock
as a class shall terminate, and (z) the number of Directors shall be such number
as  may  be  provided  for  in  the  certificate  of  incorporation  or  by-laws
irrespective  of any  increase  made  pursuant to the  provisions  of  Paragraph
(C)(ii)  of this  Section  3 (such  number  being  subject,  however,  to change
thereafter in any manner provided by law or in the certificate of  incorporation
or by-laws).  Any vacancies in the Board of Directors effected by the provisions
of clauses (y) and (z) in the preceding  sentence may be filled by a majority of
the remaining  Directors.  D Except as set forth herein or as otherwise provided
by law,  holders of Series D Preferred Stock shall have no special voting rights
and their consent shall not be required  (except to the extent they are entitled
to vote  with  holders  of Common  Stock as set forth  herein)  for  taking  any
corporate action.

              Section 4. Certain Restrictions.

              (A)   Whenever   quarterly   dividends   or  other   dividends  or
distributions  payable on the Series D Preferred  Stock as provided in Section 2
are in  arrears,  thereafter  and until all  accrued  and unpaid  dividends  and
distributions,  whether or not declared,  on shares of Series D Preferred  Stock
outstanding shall have been paid in full, the Corporation shall not

                  (i) declare or pay dividends on, make any other  distributions
on, or redeem or purchase or otherwise  acquire for  consideration any shares of
stock ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series D Preferred Stock;

                  (ii)   declare  or  pay   dividends   on  or  make  any  other
distributions on any shares of stock ranking on a parity (either as to dividends
or upon  liquidation,  dissolution  or winding  up) with the Series D  Preferred
Stock,  except  dividends  paid ratably on the Series D Preferred  Stock and all
such parity stock on which  dividends are payable or in arrears in proportion to
the total amounts to which the holders of all such shares are then entitled;

                  (iii)   redeem  or   purchase   or   otherwise   acquire   for
consideration shares of any stock ranking on a parity (either as to dividends or
upon liquidation,  dissolution or winding up) with the Series D Preferred Stock,
provided  that the  Corporation  may at any time  redeem,  purchase or otherwise
acquire  shares of any such parity  stock in exchange for shares of any stock of
the  Corporation  ranking  junior  (either as to dividends or upon  dissolution,
liquidation or winding up) to the Series D Preferred Stock; or

                  (iv)  purchase  or  otherwise  acquire for  consideration  any
shares of Series D Preferred  Stock,  or any shares of stock ranking on a parity
with the Series D Preferred  Stock,  except in accordance  with a purchase offer
made in writing or by  publication  (as determined by the Board of Directors) to
all  holders of such  shares  upon such terms as the Board of  Directors,  after
consideration of the respective  annual dividend rates and other relative rights

<PAGE>

and  preferences of the respective  series and classes,  shall determine in good
faith will result in fair and equitable treatment among the respective series or
classes.

              (B)  The  Corporation  shall  not  permit  any  subsidiary  of the
Corporation  to purchase or otherwise  acquire for  consideration  any shares of
stock of the Corporation  unless the Corporation  could,  under Paragraph (A) of
this Section 4,  purchase or  otherwise  acquire such shares at such time and in
such manner.

              Section 5.  Reacquired  Shares.  Any shares of Series D  Preferred
Stock  purchased  or  otherwise  acquired  by  the  Corporation  in  any  manner
whatsoever shall be retired and canceled promptly after the acquisition thereof.
All such shares shall upon their  cancellation  become  authorized  but unissued
shares  of  Preferred  Stock  and may be  reissued  as part of a new  series  of
Preferred  Stock to be  created by  resolution  or  resolutions  of the Board of
Directors,  subject to the  conditions  and  restrictions  on issuance set forth
herein,  in the  Certificate of  Incorporation,  or in any other  Certificate of
Amendment  creating  a series  of  Preferred  Stock or any  similar  stock or as
otherwise required by law.

              Section 6.   Liquidation, Dissolution or Winding Up.

              (A) Upon any liquidation (voluntary or otherwise),  dissolution or
winding up of the Corporation,  no distribution  shall be made to the holders of
shares of stock  ranking  junior  (either as to dividends  or upon  liquidation,
dissolution  or  winding  up) to the  Series D  Preferred  Stock  unless,  prior
thereto,  the holders of shares of Series D Preferred  Stock shall have received
$100 per  share,  plus an amount  equal to  accrued  and  unpaid  dividends  and
distributions thereon, whether or not declared, to the date of such payment (the
"Series D Liquidation Preference").  Following the payment of the full amount of
the Series D Liquidation Preference,  no additional  distributions shall be made
to the holders of shares of Series D Preferred Stock unless,  prior thereto, the
holders of shares of Common  Stock shall have  received an amount per share (the
"Common Adjustment") equal to the quotient obtained by dividing (i) the Series D
Liquidation  Preference by (ii) one hundred (100) (as appropriately  adjusted as
set forth in  subparagraph  (C) below to reflect  such  events as stock  splits,
stock  dividends and  recapitalizations  with respect to the Common Stock) (such
number,  the "Adjustment  Number").  Following the payment of the full amount of
the Series D Liquidation  Preference and the Common Adjustment in respect of all
outstanding  shares of Series D Preferred Stock and Common Stock,  respectively,
holders of Series D Preferred  Stock and holders of shares of Common Stock shall
receive their  ratable and  proportionate  share of the  remaining  assets to be
distributed  in the ratio of the  Adjustment  Number to one (1) with  respect to
such Preferred Stock and Common Stock, on a per share basis, respectively.

              (B) In the event,  however,  that there are not sufficient  assets
available to permit  payment in full of the Series D Liquidation  Preference and
the  liquidation  preferences  of all other series of Preferred  Stock,  if any,
which rank on a parity with the Series D Preferred  Stock,  then such  remaining
assets  shall be  distributed  ratably to the holders of such  parity  shares in
proportion to their respective liquidation  preferences.  In the event, however,
that there are not sufficient  assets available to permit payment in full of the
Common  Adjustment,  then such remaining assets shall be distributed  ratably to
the holders of Common Stock.

<PAGE>

              (C) In the  event  the  Corporation  shall at any time  after  the
Rights  Declaration  Date (i) declare any  dividend on Common  Stock  payable in
shares of Common Stock,  (ii) subdivide the  outstanding  Common Stock, or (iii)
combine the  outstanding  Common Stock into a smaller number of shares,  then in
each such case the Adjustment  Number in effect  immediately prior to such event
shall be  adjusted  by  multiplying  such  Adjustment  Number by a fraction  the
numerator  of  which  is the  number  of  shares  of  Common  Stock  outstanding
immediately  after  such  event and the  denominator  of which is the  number of
shares of Common Stock that were outstanding immediately prior to such event.

              Section 7.  Consolidation,  Merger,  etc. In case the  Corporation
shall enter into any consolidation,  merger, combination or other transaction in
which the shares of Common Stock are  exchanged  for or changed into other stock
or securities,  cash and/or any other property, then in any such case the shares
of Series D Preferred  Stock shall at the same time be  similarly  exchanged  or
changed  in an  amount  per  share  (subject  to the  provision  for  adjustment
hereinafter set forth) equal to one hundred (100) times the aggregate  amount of
stock, securities, cash and/or any other property (payable in kind), as the case
may be,  into  which or for which  each  share of  Common  Stock is  changed  or
exchanged.  In the  event the  Corporation  shall at any time  after the  Rights
Declaration  Date (i) declare any dividend on Common Stock  payable in shares of
Common Stock, (ii) subdivide the outstanding  Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount set forth in the  preceding  sentence with respect to the exchange or
change of shares of Series D Preferred  Stock  shall be adjusted by  multiplying
such  amount by a  fraction  the  numerator  of which is the number of shares of
Common Stock  outstanding  immediately  after such event and the  denominator of
which is the number of shares of Common Stock that were outstanding  immediately
prior to such event.

              Section 8. No Redemption.  The shares of Series D Preferred  Stock
shall not be redeemable.

              Section 9. Ranking. The Series D Preferred Stock shall rank junior
to all other series of the  Corporation's  Preferred  Stock as to the payment of
dividends and the  distribution  of assets,  unless the terms of any such series
shall provide otherwise.

              Section 10.  Amendment.  The Certificate of  Incorporation  of the
Corporation  shall not be further  amended in any manner which would  materially
alter or change  the  powers,  preferences  or  special  rights of the  Series D
Preferred Stock so as to affect them adversely  without the affirmative  vote of
the  holders  of a  majority  or more of the  outstanding  shares  of  Series  D
Preferred Stock, voting separately as a class.

              Section 11.  Fractional  Shares.  Series D Preferred  Stock may be
issued in fractions of a share which shall entitle the holder,  in proportion to
such holder's  fractional shares, to exercise voting rights,  receive dividends,
participate  in  distributions  and to have the  benefit of all other  rights of
holders of Series D Preferred Stock."

              FIFTH:   The   foregoing   amendments   to  the   Certificate   of
Incorporation  of the Corporation  were authorized by a majority of the Board of
Directors  of the  Corporation  pursuant  to the  authority  vested in it by the
Certificate  of  Incorporation  and  pursuant  to  Section  502 of the  Business
Corporation Law of the State of New York, at a meeting of the Board of Directors
duly held on the 30th day of March, 1999.

<PAGE>

              IN WITNESS  WHEREOF,  the undersigned  officers of the Corporation
have signed this Certificate of Amendment this 30th day of March,  1999 and each
affirms that the statements made herein are true under the penalties of perjury.

                                         MARKETSPAN CORPORATION



                                         By
                                           ------------------------------------
                                            Name:
                                            Title:



                                         By
                                           ------------------------------------
                                            Name:
                                            Title:


<PAGE>

                                                                       EXHIBIT B

                          [Form of Rights Certificate]


Certificate No. R-                                         _______________Rights



              NOT  EXERCISABLE  AFTER  MARCH 30,  2009 OR EARLIER IF REDEEMED OR
EXCHANGED BY THE COMPANY. THE RIGHTS ARE SUBJECT TO REDEMPTION, AT THE OPTION OF
THE COMPANY,  AT $.01 PER RIGHT ON THE TERMS SET FORTH IN THE RIGHTS  AGREEMENT.
UNDER CERTAIN CIRCUMSTANCES, RIGHTS BENEFICIALLY OWNED BY AN ACQUIRING PERSON OR
ANY  AFFILIATE  OR  ASSOCIATE  THEREOF  (AS SUCH TERMS ARE DEFINED IN THE RIGHTS
AGREEMENT) AND ANY SUBSEQUENT  HOLDER OF SUCH RIGHTS SHALL BECOME NULL AND VOID.
[THE RIGHTS  REPRESENTED  BY THIS RIGHTS  CERTIFICATE  ARE OR WERE  BENEFICIALLY
OWNED BY A PERSON  WHO WAS OR BECAME AN  ACQUIRING  PERSON  OR AN  AFFILIATE  OR
ASSOCIATE  OF AN  ACQUIRING  PERSON  (AS SUCH  TERMS ARE  DEFINED  IN THE RIGHTS
AGREEMENT).  ACCORDINGLY,  THIS RIGHTS  CERTIFICATE  AND THE RIGHTS  REPRESENTED
HEREBY SHALL BECOME NULL AND VOID IN THE CIRCUMSTANCES SPECIFIED IN SECTION 7(e)
OF SUCH AGREEMENT.]*

                               Rights Certificate

                             MARKETSPAN CORPORATION

This certifies that _____________________________, or registered assigns, is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement,  dated March 30, 1999 (as from time to time amended or  supplemented,
the "Rights Agreement"),  between MarketSpan Corporation, a New York corporation
doing  business as KeySpan Energy (the  "Company"),  and The Bank of New York, a
New York banking  corporation (the "Rights Agent"), to purchase from the Company
at any time  prior to 5:00  P.M.  (New York  City  time) on March 30,  2009 (the
"Final Expiration  Date"),  unless earlier redeemed or exchanged by the Company,
at the office or offices of the Rights Agent designated for such purpose, or its
successors as Rights Agent, one  one-hundredth  of a fully paid,  non-assessable
share of Series D Preferred Stock (the "Preferred  Stock") of the Company,  at a
purchase  price  of  $95.00  per one  one-hundredth  of a share  (the  "Purchase
Price"),  upon  presentation  and surrender of this Rights  Certificate with the
Form of Election to Purchase and related  Certificate duly executed.  The number
of Rights  evidenced by this Rights  Certificate (and the number of shares which
may be purchased upon exercise  thereof) set forth above, and the Purchase Price
per share set forth  above,  are the number and  Purchase  Price as of April 14,
1999,  based on the  Preferred  Stock  as  constituted  at such  date and may be
adjusted in accordance with the provisions of the Rights Agreement.  The Company
reserves the right to 

- -----------

*The portion of the legend in brackets  shall be inserted only if applicable and
shall replace the preceding sentences.

<PAGE>

require,  prior to the occurrence of a Triggering Event (as such term is defined
in the Rights Agreement) that a number of Rights be exercised so that only whole
shares of Preferred Stock will be issued.

              Upon the occurrence of a Section  11(a)(ii) Event (as such term is
defined  in the  Rights  Agreement),  if the  Rights  evidenced  by this  Rights
Certificate are beneficially owned by (i) an Acquiring Person or an Affiliate or
Associate of any such Acquiring  Person (as such terms are defined in the Rights
Agreement),  (ii) a  transferee  of any  such  Acquiring  Person,  Affiliate  or
Associate  or  (iii)  under  certain  circumstances   specified  in  the  Rights
Agreement,  a  transferee  of a person  who,  after  such  transfer,  became  an
Acquiring  Person,  or an Affiliate or  Associate of an Acquiring  Person,  such
Rights shall become null and void and no holder hereof shall have any right with
respect to such Rights from and after the  occurrence of such Section  11(a)(ii)
Event.

              As provided in the Rights  Agreement,  the Purchase  Price and the
number and kind of shares of Preferred  Stock or other  securities  which may be
purchased upon the exercise of the Rights  evidenced by this Rights  Certificate
are subject to modification and adjustment upon the happening of certain events,
including Triggering Events.

              This Rights Certificate is subject to all of the terms, provisions
and conditions of the Rights Agreement,  which terms,  provisions and conditions
are hereby  incorporated herein by reference and made a part hereof and to which
Rights Agreement  reference is hereby made for a full description of the rights,
limitations  of rights,  obligations,  duties and  immunities  hereunder  of the
Rights  Agent,  the Company and the  holders of the Rights  Certificates,  which
limitations of rights include the temporary  suspension of the exercisability of
such Rights under the specific  circumstances set forth in the Rights Agreement.
Copies of the Rights Agreement are on file at the above-mentioned  office of the
Rights Agent and are also available upon written request to the Rights Agent.

              This   Rights   Certificate,   with  or   without   other   Rights
Certificates,  upon  surrender at the principal  office or offices of the Rights
Agent  designated  for  such  purpose,  may  be  exchanged  for  another  Rights
Certificate  or Rights  Certificates  of like tenor and date  evidencing  Rights
entitling the holder to purchase a like aggregate  number of one  one-hundredths
of a share of Preferred Stock as the Rights evidenced by the Rights  Certificate
or Rights Certificates  surrendered shall have entitled such holder to purchase.
The Rights evidenced by this Rights Certificate may be transferred,  in whole or
in part,  upon surrender of this Rights  Certificate at the principal  office or
offices  of the  Rights  Agent  designated  for such  purpose,  with the Form of
Assignment and related  Certificate  duly executed.  If the Rights  evidenced by
this Rights  Certificate  shall be  transferred or exercised in part, the holder
shall be entitled to receive upon surrender hereof another Rights Certificate or
Rights Certificates for the number of whole Rights not transferred or exercised.

              Subject  to the  provisions  of the Rights  Agreement,  the Rights
evidenced by this  Certificate  may  generally be redeemed by the Company at its
option at a  redemption  price of $.01 per  Right at any time on or  before  the
earlier of the close of business on (i) the tenth  business  day  following  the
Stock  Acquisition  Date (as such time  period may be  extended  pursuant to the
Rights Agreement) and (ii) the Final Expiration Date.

<PAGE>

              No  fractional  shares of Preferred  Stock will be issued upon the
exercise of any Right or Rights evidenced hereby (other than fractions which are
integral  multiples of one  one-hundredth of a share of Preferred  Stock,  which
may, at the election of the Company, be evidenced by depositary  receipts),  but
in lieu  thereof  a cash  payment  will  be  made,  as  provided  in the  Rights
Agreement.

              No holder of this Rights  Certificate shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of shares of Preferred
Stock  or of any  other  securities  of the  Company  which  may at any  time be
issuable on the  exercise  hereof,  nor shall  anything  contained in the Rights
Agreement or herein be construed to confer upon the holder hereof,  as such, any
of the  rights  of a  shareholder  of the  Company  or any right to vote for the
election  of  directors  or upon any matter  submitted  to  shareholders  at any
meeting thereof,  or to give or withhold consent to any corporate  action, or to
receive notice of meetings or other actions  affecting  shareholders  (except as
provided  in the Rights  Agreement),  or to receive  dividends  or  subscription
rights,  or  otherwise,  until  the  Right or Rights  evidenced  by this  Rights
Certificate shall have been exercised as provided in the Rights Agreement.

              This Rights  Certificate  shall not be valid or obligatory for any
purpose until it shall have been countersigned by an authorized signatory of the
Rights Agent.

              WITNESS  the  facsimile  signature  of the proper  officers of the
Company and its corporate seal.


ATTEST:                                     MARKETSPAN CORPORATION



- --------------------------                  By
Secretary                                     -------------------------------- 
                                              Title                    


Countersigned:


THE BANK OF NEW YORK, as Rights Agent



By
  ---------------------------------
  Authorized Signatory


Dated as of _________________, ___



<PAGE>

                  [Form of Reverse Side of Rights Certificate]

                               FORM OF ASSIGNMENT


                (To be executed by the registered holder if such
               holder desires to transfer the Rights Certificate.)



              FOR VALUE RECEIVED  _______________________________  hereby sells,
assigns     and     transfers     unto      ____________________________________
_________________________________________________________________  
(Please print name and address of transferee)

              
___________________________________________________________________________ this
Rights  Certificate,  together with all right,  title and interest therein,  and
does        hereby        irrevocably        constitute        and       appoint
_____________________________________________  attorney,  to transfer the within
Rights Certificate on the books of the within-named  Company, with full power of
substitution.

Dated:______________, ____


                                                  ------------------------------
                                                  Signature

Signature Guaranteed:



- ------------------------------

Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements  of the Rights  Agent,  which  requirements  include  membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature  guarantee program" as may be determined by the Rights Agent in
addition  to,  or in  substitution  for,  STAMP,  all  in  accordance  with  the
Securities Exchange Act of 1934, as amended.


<PAGE>

                                   Certificate


              The undersigned hereby certifies by checking the appropriate boxes
that:

              (1) this Rights Certificate [ ] is [ ] is not being sold, assigned
and transferred by or on behalf of a Person who is or was an Acquiring Person or
an  Affiliate  or  Associate  of any such  Acquiring  Person  (as such terms are
defined pursuant to the Rights Agreement); and

              (2)  after  due  inquiry  and  to  the  best   knowledge   of  the
undersigned,  it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate  from any  Person who is, was or  subsequently  became an  Acquiring
Person or an Affiliate or Associate of an Acquiring Person.


Dated: __________, _____                            ____________________________
                                                    Signature


Signature Guaranteed:


- ------------------------------


Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements  of the Rights  Agent,  which  requirements  include  membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature  guarantee program" as may be determined by the Rights Agent in
addition  to,  or in  substitution  for,  STAMP,  all  in  accordance  with  the
Securities Exchange Act of 1934, as amended.

                                     NOTICE

              The signature to the foregoing  Assignment  and  Certificate  must
correspond  to the name as written upon the face of this Rights  Certificate  in
every particular, without alteration or enlargement or any change whatsoever.


<PAGE>


                          FORM OF ELECTION TO PURCHASE

              (To be executed if holder desires to exercise Rights
                     represented by the Rights Certificate.)


To:  MARKETSPAN CORPORATION:

              The   undersigned    hereby   irrevocably   elects   to   exercise
______________  Rights  represented  by this Rights  Certificate to purchase the
shares of  Preferred  Stock  issuable  upon the  exercise of the Rights (or such
other  securities  of the Company or of any other  person  which may be issuable
upon the exercise of the Rights) and requests that  certificates for such shares
be issued in the name of and deliverable to:

           -----------------------------------------------------------
                         (Please insert social security
                          or other identifying number)

           -----------------------------------------------------------
                         (Please print name and address)

              If such number of Rights shall not be all the Rights  evidenced by
this Rights Certificate, a new Rights Certificate for the balance of such Rights
shall be registered in the name of and delivered to:

           -----------------------------------------------------------
                         (Please insert social security
                          or other identifying number)

          ------------------------------------------------------------
                         (Please print name and address)

          ------------------------------------------------------------

          ------------------------------------------------------------


Dated:__________, ____


                                                    ----------------------------
                                                    Signature

Signature Guaranteed:


- ------------------------------


Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements  of the Rights  Agent,  which  requirements  include  membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature

<PAGE>

guarantee  program" as may be  determined by the Rights Agent in addition to, or
in substitution  for, STAMP, all in accordance with the Securities  Exchange Act
of 1934, as amended.


<PAGE>

                                   Certificate


              The undersigned hereby certifies by checking the appropriate boxes
that:

              (1) the Rights  evidenced by this Rights  Certificate  [ ] are [ ]
are not being  exercised  by or on behalf of a Person who is or was an Acquiring
Person or an Affiliate or Associate of any such Acquiring  Person (as such terms
are defined pursuant to the Rights Agreement); and

              (2)  after  due  inquiry  and  to  the  best   knowledge   of  the
undersigned,  it [ ] did [ ] did not acquire the Rights evidenced by this Rights
Certificate  from any  Person who is,  was or became an  Acquiring  Person or an
Affiliate or Associate of an Acquiring Person.

Dated: ___________, ____

                                                  ------------------------------
                                                  Signature


Signature Guaranteed:


- ------------------------------


Signatures must be guaranteed by an "eligible guarantor institution" meeting the
requirements  of the Rights  Agent,  which  requirements  include  membership or
participation in the Security Transfer Agent Medallion Program ("STAMP") or such
other "signature  guarantee program" as may be determined by the Rights Agent in
addition  to,  or in  substitution  for,  STAMP,  all  in  accordance  with  the
Securities Exchange Act of 1934, as amended.


                                     NOTICE

              The   signature  to  the   foregoing   Election  to  Purchase  and
Certificate  must correspond to the name as written upon the face of this Rights
Certificate in every particular, without alteration or enlargement or any change
whatsoever.

<PAGE>

                                                                       EXHIBIT C

                          SUMMARY OF RIGHTS TO PURCHASE

                            SERIES D PREFERRED STOCK


              On  March  30,  1999,   the  Board  of  Directors  of   MarketSpan
Corporation,  doing  business  as KeySpan  Energy  (the  "Company"),  declared a
dividend  distribution of one Right for each outstanding  share of common stock,
par value $.01 per share, of the Company (the "Common Stock") to shareholders of
record at the close of  business  on April 14, 1999 (the  "Record  Date").  Each
Right  entitles  the  registered   holder  to  purchase  from  the  Company  one
one-hundredth  of a share  of a  series  of  cumulative  preferred  stock of the
Company designated Series D Preferred Stock (the "Preferred  Stock"), at a price
of $95.00 (the "Purchase  Price"),  subject to adjustment.  The  description and
terms of the Rights are set forth in a Rights Agreement (the "Rights Agreement")
between  the  Company  and The Bank of New York,  as Rights  Agent (the  "Rights
Agent").

              Until the Distribution  Date (or earlier  redemption or expiration
of the  Rights),  which is defined  below,  the Rights will be  evidenced,  with
respect  to  any of the  Common  Stock  certificates  outstanding  prior  to the
Distribution  Date, by such Common Stock  certificates.  Until the  Distribution
Date, (or earlier  redemption or expiration of the Rights),  (i) the Rights will
be  transferred  with and only with the  Common  Stock,  (ii) new  Common  Stock
certificates  issued  after the Record Date upon  transfer,  replacement  or new
issuance  of Common  Stock  will be deemed to be  issued  with  Rights  and will
contain a notation incorporating the Rights Agreement by reference and (iii) the
surrender for transfer of any  certificate for Common Stock will also constitute
the transfer of the Rights  associated with the Common Stock represented by such
certificate.

              As soon as practicable  following the Distribution Date,  separate
certificates  evidencing the Rights  ("Rights  Certificates")  will be mailed to
holders  of  record  of the  Common  Stock as of the  close of  business  on the
Distribution  Date. From and after the  Distribution  Date, such separate Rights
Certificates alone will evidence the Rights.  Except as otherwise  determined by
the Board of Directors,  and except in connection  with the exercise of employee
stock  options,  any other  issuance  of Common  Stock  with  respect  to awards
outstanding  under employee benefit plans  outstanding on the Distribution  Date
and in connection  with the  conversion of convertible  securities  issued after
March 30, 1999, only Common Stock issued prior to the Distribution  Date will be
issued with Rights.

              "Distribution  Date"  shall  mean the  earlier  to occur of (i) 10
business  days  following  the  date of a  public  announcement  that a  person,
together with persons affiliated or associated with it, has acquired  beneficial
ownership  of 20% or more of the  outstanding  Common  Stock or (ii) 10 business
days  following  the  earlier  of  the  commencement  of,  or the  first  public
announcement  of the intent to commence,  a tender offer or exchange  offer by a
person other than the Company if, upon  consummation of the offer,  such person,
together with persons  affiliated or associated with it, would be the beneficial
owner  of 20% or  more of the  outstanding  Common  Stock.  The  Rights  are not
exercisable until the Distribution  Date. 


<PAGE>

The Rights  will  expire at the close of  business on March 30, 2009 (the "Final
Expiration  Date"),  unless  earlier  redeemed  or  exchanged  by the Company as
described below.

              The Purchase Price payable and the number of and kind of shares of
Preferred  Stock or other  securities or property  issuable upon exercise of the
Rights are subject to  adjustment  from time to time to prevent  dilution (i) in
the  event  of  a  stock   dividend  on,  or  a   subdivision,   combination  or
reclassification  of, the Preferred Stock, (ii) upon the grant to holders of the
Preferred  Stock of  certain  rights,  options  or  warrants  to  subscribe  for
Preferred Stock (or shares having the same rights, privileges and preferences as
the shares of  Preferred  Stock) at less than the  current  market  price of the
Preferred Stock or (iii) upon the distribution to holders of the Preferred Stock
of evidences of  indebtedness,  securities,  cash or assets  (excluding  regular
periodic  dividends  out of earnings or retained  earnings)  or of  subscription
rights  or  warrants  (other  than  those  referred  to  above).   With  certain
exceptions,  no  adjustment  in  the  Purchase  Price  will  be  required  until
cumulative  adjustments  require an  adjustment  of at least 1% in the  Purchase
Price. No fractional  shares of Preferred Stock will be issued upon the exercise
of any Right or Rights (other than fractions which are integral multiples of one
one-hundredth of a share of Preferred Stock),  and in lieu thereof an adjustment
in cash will be made based on the current market price of the Preferred Stock on
the last trading day prior to the date of exercise.

              Any of the events  described in the  succeeding  second and fourth
paragraphs are defined as a "Triggering Event."

              "Acquiring  Person"  shall  mean any  person  who  constitutes  an
"Interested  Shareholder"  as defined in  Section  912 of the New York  Business
Corporation Law, in effect from time to time,  (generally defined to include any
person who or which, together with all persons affiliated or associated with it,
shall be the beneficial  owner of 20% or more of the shares of Common Stock then
outstanding),  but shall not include the Company, any subsidiary of the Company,
any employee benefit plan of the Company or of any subsidiary of the Company, or
any person or entity  organized,  appointed  or  established  by the  Company or
pursuant to the terms of any such plan.

              In the event that a person,  together  with persons  affiliated or
associated  with  it,  becomes  an  Acquiring  Person  (except  as a  result  of
repurchases  of  stock  by  the  Company  or  certain   inadvertent  actions  by
institutional or certain other shareholders),  proper provision shall be made so
that each holder of a Right, except as provided below, shall thereafter have the
right  to  receive,  upon  exercise  thereof,   Common  Stock  (or,  in  certain
circumstances  as determined by the Company,  other  securities,  cash, or other
property) having a value of two times the Purchase Price. Notwithstanding any of
the  foregoing,  following  the  occurrence  of the  event  set  forth  in  this
paragraph, all Rights that are, or (under certain circumstances set forth in the
Rights  Agreement)  were,  beneficially  owned by any  Acquiring  Person  (or by
certain related parties and transferees)  will be null and void.  Rights are not
exercisable  following  the  occurrence  of the event set forth above until such
time as the Rights are no longer redeemable by the Company, as set forth below.

              For example,  at an exercise price of $95.00 per Right, each Right
not owned by an Acquiring Person (or by certain related parties and transferees)
following an event set forth in the preceding paragraph would entitle its holder
to purchase  $190.00  worth of Common  Stock (or other  consideration,  as noted
above)  for  $95.00.  Assuming  that the Common

<PAGE>

Stock had a per share  value of $47.50 at such  time,  the  holder of each valid
Right would be entitled to purchase 4 shares of Common Stock for $95.00.

              In the event that,  at any time  following  the Stock  Acquisition
Date,  which is defined below,  (i) the Company is acquired in a merger or other
business  combination  transaction  in which the  Company  is not the  surviving
corporation  (other than a merger which follows an offer described in the second
preceding  paragraph),  or (ii)  fifty  percent  (50%) or more of the  Company's
assets,  cash flow or earning  power is sold or  transferred,  proper  provision
shall be made so that each holder of a Right (other than Rights that theretofore
become  null and void as  described  in the second  preceding  paragraph)  shall
thereafter have the right to receive, upon exercise thereof, common stock of the
acquiring  company  having a value equal to two times the exercise  price of the
Right.

              At any time until the close of business on the tenth  business day
following  the  date of a  public  announcement  that a  person  has  become  an
Acquiring Person (the "Stock Acquisition Date"), the Company may redeem all, but
not less than all, the then outstanding Rights at a redemption price of $.01 per
Right  (the  "Redemption  Price").  Immediately  upon the action of the Board of
Directors  of the Company  ordering  redemption  of the Rights,  the Rights will
terminate  and the only  right of the holder of Rights  will be to  receive  the
Redemption Price.

              At any  time  after  the  acquisition  by a  person  or  group  of
affiliated or associated  persons of beneficial  ownership of 20% or more of the
outstanding  shares of Common Stock and prior to the  acquisition by such person
or group of 50% or more of the outstanding  shares of Common Stock, the Board of
Directors  may  exchange  the Rights  (other than Rights owned by such person or
group which have become void),  in whole or in part, at an exchange ratio of one
share of Common Stock, or one one-hundredth of a share of Preferred Stock (or of
a share of a class or series of the Company's  preferred stock having equivalent
rights, preferences and privileges), per Right (subject to adjustment).

              Any of the  provisions  of the Rights  Agreement may be amended by
the  Board  of  Directors  of  the  Company  prior  to  the  Distribution  Date.
Thereafter,  the provisions of the Rights  Agreement may be amended by the Board
of Directors of the Company in order to (i) cure any ambiguity,  (ii) shorten or
lengthen any time period under the Rights Agreement,  or (iii) make changes that
will not adversely affect the interests of the holders of Rights;  provided such
lengthening is for the purpose of protecting, enhancing or clarifying the rights
of, and/or the benefits to, the holders of Rights, and further;  provided,  that
no amendment may be made at such time as the Rights are not redeemable.

              Until a Right is exercised, the holder thereof, as such, will have
no rights as a shareholder of the Company,  including,  without limitation,  the
right to vote or to receive dividends. While the distribution of the Rights will
not be taxable to shareholders or to the Company, shareholders may, depending on
the circumstances,  recognize taxable income in the event that the Rights become
exercisable  for Common  Stock (or other  consideration)  of the  Company or for
common stock of the acquiring company as set forth above.

<PAGE>

              A copy of the Rights  Agreement has been filed with the Securities
and Exchange Commission as an Exhibit to a Current Report on Form 8-K. A copy of
the Rights  Agreement  will be available  free of charge from the Company.  This
summary  description  of the  Rights  does not  purport  to be  complete  and is
qualified  in its  entirety  by  reference  to the  Rights  Agreement,  which is
incorporated herein by reference.




                  KeySpan Energy Adopts Shareholder Rights Plan


              Brooklyn  and  Hicksville,  NY,  March,  30,  1999 - The  Board of
Directors of KeySpan Energy (NYSE:KSE) has adopted a Shareholder  Rights Plan to
protect the interests of its stockholders in the event of a proposed takeover of
the company.

              "While  there  has been no known  effort  to  acquire  control  of
KeySpan  Energy,  the  Shareholder  Rights Plan  protects  the  company  against
potential   takeover  attempts  that  could  jeopardize  the  interests  of  our
shareholders,"  said Robert B. Catell,  Chairman and CEO of KeySpan Energy. "The
plan is not intended to prevent an  acquisition  that is in the best interest of
our shareholders."

              The  plan,  which  is  similar  to  those  adopted  by many  other
companies,  creates a mechanism  that would dilute the  ownership  interest of a
potential  unauthorized  acquiror.  The plan  establishes  one  preferred  stock
purchase "right" for each  outstanding  share of common stock to shareholders of
record on April 14, 1999. Each right, when  exercisable,  entitles the holder to
purchase  1/100th of a share of Series D Preferred  Stock, at a price of $95.00.
The rights generally become  exercisable  following the acquisition of more than
20 percent of KeySpan Energy's common stock without the consent of the Company's
Board of Directors.

              Prior to becoming  exercisable,  the rights are  redeemable by the
board of  directors  for $0.01 per right.  If not so  redeemed,  the rights will
expire on March 30, 2009.

              KeySpan Energy operates two utilities that distribute  natural gas
under the Brooklyn Union name to approximately 1.6 million customers in New York
City and on Long Island.  It is the fourth largest  gas-distribution  company in
the United States.  Other KeySpan companies market a portfolio of energy-related
services in the Northeast,  operate  electric-generation  plants on Long Island,
and provide operating and customer services to one-million electric customers of
the Long Island Power Authority.  KeySpan's  unregulated energy activities focus
on three principal lines of business: gas exploration and development, primarily
through The Houston  Exploration  Company;  domestic pipelines and storage;  and
international activities,  including gas-processing in Canada, and gas pipelines
and local-distribution in Northern Ireland. The Company's mission is to become a
premier  energy  company  serving  customers  in  the  Northeast  and  providing
long-term  value  to its  shareholders.  For  more  information,  visit  KeySpan
Energy's web site at: www.keyspanenergy.com.

                                     ######





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