MARKETSPAN CORP
S-3, 1998-05-27
NATURAL GAS DISTRIBUTION
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      As filed with the Securities and Exchange Commission on May 27, 1998

                                                   Registration No.
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------


                            SECURITIES AND EXCHANGE COMMISSION
                                  Washington, D.C.  20549
                                      --------------
                                         FORM S-3
                                  REGISTRATION STATEMENT
                                           UNDER
                                THE SECURITIES ACT OF 1933
                                      --------------
                                  MARKETSPAN CORPORATION
                  (Exact name of registrant as specified in its charter)
                                      --------------
                  New York                                    11-3431358
            (State or other jurisdiction of                  (I.R.S. Employer
            incorporation or organization)                   Identification No.)
                                      --------------
                   175 East Old Country Road, Hicksville, New York 11801
                                      (516) 755-6650
               (Address and telephone number of principal executive offices)
                                      --------------
        CRAIG G. MATTHEWS, Executive Vice President and Chief Financial Officer

                                  MARKETSPAN CORPORATION
                                 175 East Old Country Road
                                Hicksville, New York 11801
                                      (516) 755-6650

                 (Name, address and telephone number of agent for service)
                                      --------------
                                      --------------
      Approximate date of commencement of proposed sale to the public: From time
to time after the Registration Statement becomes effective.
                                      --------------
If the only securities  being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. / /

If any of the  securities  being  registered on this Form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box. /x/
<TABLE>
<CAPTION>

                              CALCULATION OF REGISTRATION FEE

                                                                 Proposed            Proposed
                                             Amount              Maximum             Maximum             Amount Of
Title of Each Class of Securities            To Be               Offering Price      Aggregate           Registration
      To Be Registered                       Registered          Per Unit*           Offering Price*     Fee
      ----------------                       ----------          ---------           ---------------     ---

<S>                                          <C>                 <C>                 <C>                 <C>    
Common Stock, par value $0.01 per share      5,000,000 Shares    $35.00 per share    $175,000,000        $51,625
</TABLE>

* Estimated  solely for the purpose of calculating the registration fee pursuant
to Rule 457(o), on the basis of the estimated  maximum aggregate  offering price
of the registrant's common stock.

      The Registrant hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933 or until this  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
<PAGE>

PROSPECTUS


MARKETSPAN CORPORATION
INVESTOR PROGRAM

     MarketSpan  Corporation  (the  "Company"),   as  a  service  to  registered
shareholders  of its common and  certain  series of  preferred  stock  ("Company
Stock"),  customers and other investors,  hereby offers an Investor Program (the
"Plan").  The Plan is designed to provide such individuals with a convenient and
inexpensive way to purchase and sell shares of Common Stock of the Company,  par
value $0.01 per share  ("Common  Stock"),  and to  reinvest  all or a portion of
their  cash  dividends  in  additional  shares of Common  Stock.  The  investors
participating  in the Plan  ("Participants")  will be  charged  modest  fees for
certain  services and  transactions.  (See "Summary of Plan Services and Fees to
Participants".)

      Participants in the Plan may:

o     Begin  participation by making an Initial  Investment of at least $250 but
      not more  than  $150,000,  the  annual  maximum  investment.  Persons  not
      currently  owning Company Stock will be charged a one-time  enrollment fee
      of $7.50.

o     Purchase  additional  shares of Common Stock  automatically by reinvesting
      all or a portion of their cash dividends. Dividend payments not reinvested
      will be paid to Participants by check or will be deposited  electronically
      upon written request.

o     Purchase  additional  shares  of  Common  Stock by  making  Optional  Cash
      Investments  on a weekly basis by check or electronic  transfer in amounts
      of at least $25 per investment but not more than $150,000 per year.

o     Deposit their Common Stock  certificates with the Plan  Administrator,  as
      such term is defined below, for safekeeping free of charge.

o     Request the issuance of a certificate,  or transfer to another Participant
      all or a portion of their Plan  shares free of charge.  Certificates  will
      only be issued in whole share amounts.

o     Sell  Plan  shares  by  providing   written   instructions   to  the  Plan
      Administrator   or  by  using  the  automated   telephone  sales  feature.
      Participants will be charged a sales fee of $5.00 for each transaction and
      a brokerage commission of $0.05 per share sold.

o     Beneficial  owners of Company  Stock whose  shares are  registered  in the
      names of brokers  or bank  nominees  (i.e.  held in  "street  name"),  may
      participate  only in the  dividend  reinvestment  feature  of the  Plan by
      making  arrangements  with  their  brokers/banks  to  participate  on such
      beneficial owner's behalf.

This  Prospectus  relates to  5,000,000  shares of the  Company's  Common  Stock
available for purchase under the Plan.

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

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION  OR ANY  STATE  SECURITIES  COMMISSION  NOR  HAS  ANY  SUCH
COMMISSION  PASSED  UPON  THE  ACCURACY  OR  ADEQUACY  OF THIS  PROSPECTUS.  ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. -----------------

                  The date of this Prospectus is May 27, 1998.


                                      1

<PAGE>

                             AVAILABLE INFORMATION

      The Company is subject to the informational requirements of the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in  accordance
therewith,  files reports and other information with the Securities and Exchange
Commission (the "SEC").  Information as of particular dates concerning Directors
and Officers of the Company,  their  remuneration  and any material  interest of
such persons in transactions  with the Company is disclosed in proxy  statements
distributed to shareholders of the Company and filed with the SEC. Such reports,
proxy statements and other information,  once filed, can be inspected and copied
at the public  reference  facilities  of the SEC at Judiciary  Plaza,  450 Fifth
Street,  N.W.,  Washington,  D.C. 20549 and at the SEC's regional offices at 500
West Madison Street,  Chicago,  Illinois 60661 and at 7 World Trade Center,  New
York, New York 10048. Copies of such material can also be obtained at prescribed
rates from the Public Reference Section of the SEC at its principal office.  The
SEC maintains a Web site at http://www.sec.gov  that contains reports, proxy and
information  statements and other information regarding the Company, once filed.
In addition,  certain securities of the Company are listed on the New York Stock
Exchange and the Pacific Stock  Exchange  where  reports,  proxy  statements and
other information concerning the Company may be inspected.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

      There  are  hereby  incorporated  by  reference  in  this  Prospectus  the
following documents heretofore filed with the SEC pursuant to the Exchange Act:

     1.   Long Island Lighting  Company's  (LILCO) Annual Report on Form 10-K/A,
          for the year ended December 31, 1996.

      2.    Long Island Lighting  Company's  Transition  Report on Form 10-Q for
            the period  January  1, 1997 to March 31,  1997,  and its  Quarterly
            Reports on Form 10-Q for the periods ended June 30, 1997,  September
            30, 1997 and December 31, 1997.

      3.    Long Island  Lighting  Company's  Current Reports on Form 8-K, dated
            April 24, 1998,  December 31,  1997,  July 3, 1997,  March 24, 1997,
            February 25, 1997, and December 30, 1996.

      4.    The Brooklyn Union Gas Company's  Quarterly Reports on Form 10-Q for
            the periods ended March 31, 1997 and June 30, 1997.

      5.    The Brooklyn Union Gas Company's  Current Reports on Form 8-K, dated
            September 19, 1997,  March 31, 1997,  February 24, 1997 and December
            30, 1996.

     6.   KeySpan Energy Corporation's (KeySpan) Annual Report on Form 10-K, for
          the year ended September 30, 1997.

      7.    KeySpan Energy Corporation's Quarterly Reports on Form 10-Q, for the
            periods ended March 31, 1998 and December 31, 1997.

      8.    KeySpan  Energy  Corporation's  Current  Reports on Form 8-K,  dated
            April 24, 1998, December 19, 1997 and September 29, 1997.

  
<PAGE>

     All documents filed by the Company, LILCO and KeySpan with the SEC pursuant
to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act, after the date of this
Prospectus  and (i)  with  respect  to the  Company  and  KeySpan  prior  to the
termination  of this offering and (ii) with respect to LILCO up to and including
the date  upon  which  the  transaction  with the Long  Island  Power  Authority
("LIPA") was consummated shall be deemed to be incorporated by reference in this
Prospectus and to be a part hereof from the date of filing of such documents.

      The Company hereby  undertakes to provide without charge to each person to
whom a copy of this  Prospectus  has been  delivered,  upon the  written or oral
request of any such person,  a copy of any or all of the  documents and exhibits
referred to above which have been or may be  incorporated  by  reference in this
Prospectus.  Exhibits not specifically  incorporated herein by reference will be
furnished upon payment of 25 cents per page.  Requests for such copies should be
directed to Investor  Relations,  MarketSpan  Corporation,  175 East Old Country
Road, Hicksville, New York 11801, telephone number (516) 545-4914.

                                  THE COMPANY

     MarketSpan Corporation is a New York corporation which serves as the parent
holding  company  of  several  operating  companies  (some of which are  limited
liability  companies) formed as part of a series of transactions  involving Long
Island Lighting Company ("LILCO") and one or both of LIPA, a corporate municipal
instrumentality  and  subdivision  of the State of New York,  and KeySpan Energy
Corporation  ("KeySpan").  Through its wholly owned subsidiaries,  which include
The Brooklyn  Union Gas Company,  MarketSpan  Corporation  supplies  natural gas
service in Nassau  and  Suffolk  Counties,  all on Long  Island,  as well as the
Boroughs of  Brooklyn,  Queens and Staten  Island,  in the City of New York.  In
addition,  MarketSpan  Corporation  owns all of the gas assets  and  operations,
non-nuclear electric generating assets,  common plant and all related activities
formerly owned by LILCO and, through its wholly owned subsidiaries,  manages and
operates the electric system on Long Island pursuant to an agreement with LIPA.

                                USE OF PROCEEDS

      The  Plan  provides  for,  and the  Company  currently  contemplates,  the
issuance of Common Stock  directly  from the Company  either from shares held in
the Company's treasury or as newly issued shares. The Plan also provides for the
purchase  of  Common  Stock on the open  market by an agent  independent  of the
Company.  To the extent that shares of Common Stock are purchased  directly from
the Company,  the net  proceeds  are  expected to be used for general  corporate
purposes.  The Company cannot estimate the number of shares of Common Stock that
the Company  will sell  through the Plan or the prices at which such shares will
be sold.  Should Plan shares be purchased  on the open market,  the Company will
not receive any of the proceeds  from the sale of such shares.  The Company does
not  expect to change the source of Plan  shares  frequently  and will not do so
more than once in any three month  period or such other period of time as may be
permitted under future SEC regulations.



                                      3

<PAGE>

                            DESCRIPTION OF THE PLAN

      The following is a question and answer  explanation of the Plan and of the
terms and conditions  under which  Participants  may purchase and sell shares of
Company Common Stock.

Purpose

1.    What is the purpose of the Plan?

      The purpose of the Plan is to provide  registered  shareholders of Company
Stock, customers and other investors a simple,  convenient and economical way to
accumulate and increase their  investment in Common Stock and to reinvest all or
a portion of their cash dividends in additional shares of Common Stock. The Plan
also provides  Participants  with an economical  method to sell shares of Common
Stock.

Advantages and Disadvantages

2.    What are the Advantages of the Plan?

      The advantages of the Plan are as follows:

      o     Direct  Purchase of Initial  Shares:  Persons not  presently  owning
            shares of Company  Stock may enroll in the Plan by making an initial
            investment of at least $250 but not more than $150,000.  Persons not
            currently owning Company Stock will be charged a one-time enrollment
            fee of $7.50.

      o     Reinvestment  of  Dividends:  Participants  may purchase  additional
            shares of Common Stock automatically by reinvesting all or a portion
            of their cash  dividends  on or after the  applicable  payment  date
            ("Dividend Payment Date").  Dividend payments not reinvested will be
            paid to  Participants  by check or will be deposited  electronically
            upon written request.

      o     Direct Purchase of Common Stock through  Optional Cash  Investments:
            Participants  may  purchase  additional  shares of Common Stock on a
            weekly  basis  by  making  optional  cash  investments  by  check or
            electronic transfer in amounts of at least $25 per investment,  with
            a maximum  allowable  investment of $150,000 per year.  Participants
            may  elect  not  to  reinvest  their  cash  dividends  and  purchase
            additional  shares of Common Stock through optional cash investments
            only.

      o     Certificate  Safekeeping:  The Plan offers a  "safekeeping"  service
            free of charge,  whereby  shareholders  of record may deposit  their
            Common Stock  certificates with the Plan Administrator (see Question
            20) and have  these  shares  credited  to their Plan  account.  This
            feature prevents stock certificate loss, theft or destruction. Since
            deposited shares become Plan shares, they may be transferred or sold
            through the Plan in a convenient and economical manner.

     o    Reduced Fees: Fees charged to the Participant are usually less than if
          the individual  investor  purchased or sold shares outside of the Plan
          through  a  broker.  (See  "Summary  of  Plan  Services  and  Fees  to
          Participants".)


                                      4

<PAGE>



      o     Certificates/Transfer  of  Shares:   Participants  may  request  the
            issuance of a certificate or transfer to another  Participant of all
            or a portion of their Plan shares free of charge.  Certificates will
            only be issued in whole share amounts.

      o     Convenient,  Inexpensive Sale of Shares:  Participants may sell Plan
            shares by providing written  instructions to the Plan  Administrator
            (see Question 21) or by using the automated telephone sales feature.
            Participants  will  be  charged  a  sales  fee  of  $5.00  for  each
            transaction and a brokerage commission of $0.05 per share sold.

     o    Simplified Recordkeeping: Participants are furnished an acknowledgment
          after each  purchase  or sale,  quarterly  statements  and  cumulative
          year-end  statements  of their Plan  Accounts,  providing a simplified
          method of recordkeeping.

3.    What are the Disadvantages of the Plan?

      The disadvantages of the Plan are as follows:

     o    No Interest Paid on Funds Pending  Investment:  No interest is paid on
          dividends or optional cash investments held by the Plan  Administrator
          pending investment or reinvestment.

      o     Purchase/Sale Price Determination: Participants have no control over
            the  share  price  or the  timing  of the sale or  purchase  of Plan
            shares. Participants cannot designate a specific price or a specific
            date at  which  to sell  or  purchase  Common  Stock.  In  addition,
            Participants  will not know the exact  number  of  shares  purchased
            until  after the  Investment  Date,  as such term is  defined in the
            answer to Question 15.


Administration

4.    Who Administers the Plan?

      The Bank of New York,  the Company's  Transfer  Agent,  or such  successor
administrator   as  the  Company  may  designate  (the  "Plan   Administrator"),
administers  the Plan,  determines  the timing of  purchases on the open market,
holds  shares of Common Stock  acquired  under the Plan,  maintains  records and
sends statements of account activity to Participants.  Any open market purchases
and sales on behalf of the Participants  will be made by the Plan  Administrator
through BNY ESI & Co.  ("BNY ESI"),  a  full-service  brokerage  firm and wholly
owned  subsidiary  of The  Bank of New  York  Company,  Inc.  BNY  ESI  receives
brokerage  commissions  for  related  open  market  transactions,  paid  by  the
Participant. (See "Summary of Plan Services and Fees to Participants.")

5.   Who  should  I  contact  with   questions   regarding   the  Plan  and  its
     administration?

      You may contact the Plan Administrator with questions  concerning the Plan
by calling its toll free number, 1-800-482-3638 or by writing to:

                  The Bank of New York
                  Shareholder Services Department
                  Church Street Station
                  P. O. Box 11258
                  New York, New York  10286-1258

     The Plan Administrator's Internet addres is: "HTTP://STKXFER.BANKOFNY.COM".
The Pllan Administrator's e-mail address is: "[email protected]".

      Please include MarketSpan Corporation on all  inquiries/correspondence and
provide your Plan account number and/or social security number.

                                      5

<PAGE>




6.   Where do I send my written  instructions for transactions  such as optional
     cash investments,  sales,  account  termination,  transfers and certificate
     issuances (withdrawals)?

      Participants  are encouraged to use the bottom  tear-off  portion of their
statements to provide the Plan  Administrator with their  instructions.  You may
send your written instructions to:

                  The Bank of New York
                  Dividend Reinvestment Department
                  P. O. Box 1958
                  Newark, New Jersey  07101-9774

Eligibility

7.    Who is eligible to participate in the Plan?

     Any person or entity (other than holders of the Company's  Preferred Stock,
Series A, B and C) is eligible to join the Plan,  provided  that (a) such person
or  entity  fulfills  the  prerequisites   for  participation   described  under
"Enrollment  Procedures",  and (b) in the case of  citizens  or  residents  of a
country  other  than  the  United  States,   its  territories  and  possessions,
participation  would not violate local laws applicable to the Company,  the Plan
or the Participant.

      The Plan  Administrator  will furnish a Plan  Prospectus,  the appropriate
Plan Authorization Form and enrollment information at any time upon request.

Enrollment Procedures

8.    How does an individual become a Participant?

      o     Existing  Participants  in the LILCO Investor  Common Stock Plan and
            the  KeySpan  Dividend  Reinvestment  and Stock  Purchase  Plan will
            automatically  be  Participants  in the Plan and need do  nothing to
            continue such participation.  However, any Participant who wishes to
            change his or her  participation  in any way must  submit a new Plan
            Authorization Form.

      o     The  Company's  Common and/or  Eligible  Preferred  Shareholders  of
            Record   ("Shareholders  of  Record")  need  only  complete  a  Plan
            Authorization  Form to enroll  in the Plan to become a  Participant.
            Shareholders  of record are not required to submit a minimum initial
            investment or pay an enrollment fee to enroll in the Plan.

      o     Persons Not Currently Owning Company Stock may enroll in the Plan by
            completing a Plan  Authorization  Form and  returning  the completed
            Form to the Plan  Administrator,  along with payment of the one-time
            Enrollment Fee of $7.50 plus payment of an Initial  Investment of at
            least $250 but not more than  $150,000.  The payment  must be in the
            form of a check or money  order,  made  payable  to "The Bank of New
            York - MarketSpan Corporation" PLEASE DO NOT SEND CASH.

     o    Beneficial Owners of Company Stock, whose shares are registered in the
          names of brokers or bank nominees (i.e.  held in "street  name"),  may
          participate only in

                                      6

<PAGE>



            the dividend reinvestment feature of the Plan by making arrangements
            with their brokers/banks to participate on their behalf. Please note
            that such  participation  is outside the terms and conditions of the
            Plan,  including  any fees the  broker/bank  nominee  may charge the
            beneficial  owner  for  executing  reinvestment  transactions.   The
            investor   remains  a   beneficial   owner  and  must  rely  on  the
            brokers/bank  nominees for all recordkeeping  services. A beneficial
            owner  may  become  a  direct  Plan  Participant  by  having  shares
            transferred  into his or her own name,  becoming  a  shareholder  of
            record and completing a Plan Authorization Form, or by following the
            same enrollment  procedure for "Persons Not Currently Owning Company
            Stock".

9.    What Investment Options are available to Participants?

      Each Participant must elect one of the following Investment Options on the
Plan Authorization Form:

      o     Full Dividend  Reinvestment - All cash dividends on all certificated
            and Plan shares of Company Stock will be automatically reinvested to
            purchase additional shares of Common Stock.

     o    Partial  Dividend   Reinvestment  -  Participants  will  receive  cash
          dividends  on a  specified  number  of  shares  of  Company  Stock and
          automatically have the cash dividends on the remainder of their shares
          reinvested to purchase additional shares of Common Stock. Participants
          electing  partial  reinvestment  of cash  dividends must designate the
          number of whole Plan shares and/or  certificated shares for which they
          choose  to  receive  cash  dividends.   Cash  dividends  are  sent  to
          Participants by check or, upon request,  are deposited  electronically
          into the Participant's bank account.

      o     Optional  Cash  Investments  Only -  Participants  will receive cash
            dividends  on all their  certificated  and Plan  shares  of  Company
            Stock,  and only Optional Cash  Investments  are applied  toward the
            purchase of additional shares of Common Stock. Shares purchased with
            Optional Cash Investments are held in the Participant's Plan account
            unless  otherwise  directed,  and dividends  paid on such shares are
            paid by check or, upon written request, are deposited electronically
            into the Participant's bank account.

      The Investment  Option elected by the Plan  Participant  remains in effect
until the Participant  changes his or her Investment  Option by completing a new
Plan Authorization Form.
(See the answer to Question 10 below.)

      For more  information  on the  electronic  deposit  of  dividends,  please
contact the Plan Administrator.

10.   May Participants change their Investment Option?

      Yes.  The  Investment  Option  may be  changed  by  completing  a new Plan
Authorization Form and returning it to the Plan Administrator. For the change to
be  effective  with  respect  to  a  particular   dividend  payment,   the  Plan
Administrator  must  receive  the new Plan  Authorization  Form on or before the
applicable record date for the dividend payment.



                                      7

<PAGE>



11.   When are Dividends Reinvested?

      Cash dividends  will be reinvested on or as soon as practicable  after the
applicable  Dividend  Payment Date  ("Dividend  Investment  Date").  If the Plan
Administrator  receives the completed Plan Authorization Form prior to or on the
applicable  record date for the dividend  payment,  dividends will be reinvested
according to the  Participant's  instructions on that Dividend  Payment Date. If
the Plan Administrator  receives the completed Plan Authorization Form after the
applicable  dividend  record  date,  the elected  Investment  Option will not be
effective until the next dividend record and payment dates.

12.  When will shares purchased with Reinvested Dividends be entitled to receive
     dividends?

      Shares  purchased with reinvested  dividends will be entitled to dividends
on the Dividend Payment Date following the purchase of such shares.

Initial Investments and Optional Cash Investments

13.   How are Initial Investments made?

      To  enroll  in the  Plan  and  become a  Participant,  Persons  who do not
currently  own Company  Stock are required to make an Initial  Investment  of at
least $250 but not more than $150,000. Payment must be in the form of a check or
money order made  payable to, "The Bank of New York -  MarketSpan  Corporation",
and must be accompanied by a completed Plan Authorization Form. The payment of a
one-time enrollment fee of $7.50 is also required.

14.   How does the Optional Cash Investment feature work?

      All Plan  Participants may purchase  additional  shares of Common Stock by
making Optional Cash Investments. The minimum Optional Cash Investment amount is
$25 per  investment,  with a maximum amount of $150,000 per year.  Optional Cash
Investments  must be in the form of a check or money order made payable to, "The
Bank of New  York -  MarketSpan  Corporation",  or  Participants  may  elect  to
authorize  automatic  monthly  electronic  fund transfers  (EFT) from their bank
accounts.  To obtain the proper EFT Authorization  Form, please contact the Plan
Administrator. Checks for Optional Cash Investments should be accompanied by the
tear-off stub that is attached to a Participant's statement.  Third party checks
will not be accepted  and will be returned  to the sender.  No interest  will be
paid on any cash balances pending investment by the Plan Administrator.

      Optional  Cash  Investments  through  EFTs are  deducted  monthly from the
Participant's  designated bank account on the 25th day of each month, or if such
date is not a business day, the deduction will be made on the preceding business
day.  The  Plan  Administrator  will  make  the  authorized  deduction  from any
financial  institution that  participates in the Automated  Clearing House (ACH)
system.  Amounts  received  electronically  by the  Plan  Administrator  will be
invested on the next  Investment  Date (as such term is defined in the answer to
Question  15).  The monthly  electronic  transfer of funds will  continue  until
terminated or changed by the Participant.  Any such change should be sent to the
Plan Administrator at least 20 days prior to the 25th of the month.

      Brokers or bank nominees  participating on behalf of beneficial owners may
only utilize the dividend  reinvestment  feature of the Plan and cannot  utilize
the  Optional  Cash  Investment   feature.  If  a  beneficial  owner  wishes  to
participate in the Optional Cash Investment feature of the

                                      8

<PAGE>



Plan,  he or she must first  become a  shareholder  of record or make an Initial
Investment to directly enroll in the Plan.

      In the  event  that a  Participant's  Optional  Cash  Investment  check is
returned  unpaid for any reason or a  Participant's  designated bank account for
EFT does not have sufficient funds for his/her authorized monthly deduction, the
Plan Administrator  will immediately  remove from the Participant's  account any
shares  already  purchased  upon  the  prior  credit  of such  funds.  The  Plan
Administrator  will thereupon be entitled to sell any such shares to satisfy any
uncollected  amounts.  If the  net  proceeds  of the  sale of  such  shares  are
insufficient  to  satisfy  the  balance  of the  uncollected  amounts,  the Plan
Administrator  reserves  the  right  to sell  such  additional  shares  from the
Participant's account as may be necessary to satisfy the uncollected balance.

15.   When will Optional Cash Investments be invested?

      The  Investment  Date for voluntary cash payments (as well as initial cash
investments  from  non-shareholders)  is the first  Thursday  of each week.  The
Investment  Date for dividends is the Common Stock  dividend  payment date.  If,
however,  an Investment Date falls on a date when the New York Stock Exchange is
closed,  the first  day  immediately  following  such date on which the New York
Stock Exchange is open will be the Investment Date.

Common Stock Purchases

16.   What is the source of Common Stock purchased under the Plan?

      Shares of Common  Stock  will be  purchased  either on the open  market or
directly  from the  Company,  from shares held in the  Company's  treasury or as
newly issued shares or a combination of the foregoing.

17.   How is the purchase price of the Common Stock determined?

      The purchase  price of Common  Stock  purchased on the open market will be
100% of the weighted average price of all shares purchased during the applicable
investment  period,  adjusted  to include  brokerage  commissions.  Open  market
purchases are expected to be made through BNY ESI. A Plan  Participant will have
the  applicable  commissions  deducted  from the funds used to  purchase  shares
acquired   under  the  Plan  (see   "Summary  of  Plan   Services  and  Fees  to
Participants").

      The purchase  price of Common Stock  purchased  directly  from the Company
will be 100% of the  average  of the high and low  prices  of the  Common  Stock
reported on the New York Stock Exchange  Composite  Transactions on the relevant
Dividend or Optional Cash Investment Date.

18.   How many shares of Common Stock will be purchased for Participants?

      The  number of shares  purchased  for a  Participant  will be equal to the
amount of the Participant's  Optional Cash  Investments,  if any, plus dividends
available  for  reinvestment,  or the  Initial  Investment  received by the Plan
Administrator during the investment period, divided by the purchase price of the
shares.  The  Participant's  account will be credited with the number of shares,
including  fractional shares computed to four decimal places, equal to the total
amount invested.


                                      9

<PAGE>



      A Participant  cannot request the purchase of a specific  number of shares
nor can he or she request that the purchase be made at a specific price nor on a
specific date.

Stock Certificates and Safekeeping

19.  Will  certificates be issued for shares of Common Stock  purchased  through
     the Plan?

      No. Normally,  certificates  for shares of Common Stock purchased  through
the  Plan  will  not be  issued  to  Participants,  but will be held by the Plan
Administrator or its nominee on behalf of the Participant.  The number of shares
of Common Stock  credited to a  Participant's  Plan account will be shown on the
Participant's account statement.

      A  Participant  may request the  issuance  of a  certificate  for all or a
portion of Plan  shares in his or her  account.  To request a  certificate,  the
Participant  should fill out and sign the request  form located on the bottom of
his or her account  statement,  or call the Plan Administrator for instructions.
Certificates  can only be issued in whole share  amounts  and not in  fractional
shares.
There is no fee charged to the Participant for this service.

      Certificate  issuance of Plan shares will not  constitute  termination  of
Plan participation,  unless otherwise requested by the Participant.  However, if
the  Participant  withdraws  all of his or her Plan  shares,  the  account  will
automatically  be  terminated.  The account may also be  terminated  by the Plan
Administrator  upon written notice to the  Participant if there is less than one
share remaining in the  Participant's  Plan account and the Participant is not a
registered  shareholder of any other shares of Company Stock for which dividends
have been designated for Plan reinvestment.

20.   What is the Safekeeping feature of the Plan and how does it work?

      At  the  time  of  enrollment  in  the  Plan,  or  any  time   thereafter,
Participants may elect to use the Plan's Safekeeping service to deposit with the
Plan Administrator  certificates  representing shares of Common Stock registered
in the name of the Participant. The shares represented by such certificates will
be  deposited  or credited to the Plan  account of the  Participant  and will be
treated in the same manner as shares purchased through the Plan.

      By using the Plan's Safekeeping  service,  Participants no longer bear the
risk associated  with loss,  theft or destruction of stock  certificates.  Also,
because  shares  deposited with the Plan  Administrator  are treated in the same
manner as shares  purchased  through the Plan,  they may be  transferred or sold
through the Plan in a convenient and economical manner.

      Participants who wish to deposit their Common Stock  certificates with the
Plan Administrator  should send them via registered mail, or certified mail with
return  receipt  requested.  There  is  no  fee  for  this  service.  The  stock
certificates should not be endorsed.

Sale of Shares

21.   How may Participants sell their Plan shares?

      Participants  may  instruct the Plan  Administrator  to sell any or all of
their  Plan  shares  at any  time by  completing  and  signing  the  appropriate
instruction  form. The instruction form is a tear-off stub located at the bottom
of the Participant's  account statement.  The Participant should indicate on the
form the  number of shares  to be sold.  The form must be signed by all  account
owners.  The completed  form must then be mailed back to the Plan  Administrator
for processing.

                                      10

<PAGE>



The  Participant  may also  call the Plan  Administrator's  toll-free  number to
obtain a "PIN" number which will allow the  Participant to sell Plan shares over
the telephone. All Plan shares, including shares deposited for safekeeping,  may
be sold  using  either  method.  Shares  held  outside  the Plan may not be sold
through the Plan.

      Participants  selling or  withdrawing  all of their  shares  from the Plan
automatically  terminate  their  participation  in the Plan. To re-enroll in the
Plan,  the person must fulfill the  prerequisites  for  participation  described
under "Enrollment Procedures" and submit a new Plan Authorization Form.

22.   How is the sale price of Plan shares determined?

      The Plan  Administrator  aggregates  all  requests to sell shares and then
sells the total share amount on the open market through BNY ESI. Shares are sold
at least weekly,  and depending on volume,  as frequently as daily. BNY ESI will
make every  reasonable  effort to process all sales orders on the day the orders
are received,  provided that  instructions are received before 1:00 p.m. eastern
standard  time on a  business  day  during  which BNY ESI and the New York Stock
Exchange are open. The sales price will not be known until the sale is completed
and is based on the  weighted  average of all  shares  sold  during the  selling
period,  adjusted  to  exclude  brokerage  commissions.  Following  the sale and
allowing  for the  settlement  of the trade  under SEC  rules,  typically  three
business  days, a check will be issued  payable to the account  owner(s) for the
net cash  proceeds  of the sale  after a  service  fee of  $5.00  and  brokerage
commissions   are  deducted.   (See  "Summary  of  Plan  Services  and  Fees  to
Participants.")  The Plan  Administrator  has  full  discretion  in all  matters
related to the sale,  including  the time of sale and sales price.  Participants
cannot specify a price or a time at which to sell their Plan shares.

      Participants  should be aware that the Common Stock price may rise or fall
during  the  period  between  a  request  for  sale,  its  receipt  by the  Plan
Administrator and the ultimate sale on the open market. Instructions sent to the
Plan Administrator to sell shares are irrevocable and may not be rescinded.

Direct Registration Shares

23.   How may Participants register their Plan shares?

     Participants  who wish to  register  their  shares  may either (a) obtain a
stock  certificate  from the Plan  Administrator  (see Question 19) representing
their share  ownership or (b) hold their shares through Direct  Registration.  A
Participant who selects the Direct  Registration option will have his/her shares
recorded  on the books of the  Company  and will  receive a  Transaction  Advice
regarding his/her holdings, in lieu of a stock certificate ("Direct Registration
Shares").  Direct Registration Shares are no different from certificated shares,
except that there are no certificates to keep safe.

      Participants who hold stock through Direct Registration have the option of
selling their shares through the Plan  Administrator  (see Question 21), or they
may use a broker.

      Additional  shares  acquired  through  the  Plan  are  held  by  the  Plan
Administrator on behalf of the Participant.  However,  Participants may elect to
withdraw  their Plan shares at any time,  and at no cost,  either in the form of
stock certificates or Direct Registration Shares.

      Inquiries relating to the Direct  Registration  option should be addressed
to the Plan Administrator.


                                      11

<PAGE>



Transfer of Shares

24.  May  Participants  assign or transfer all or a part of their Plan shares to
     another person?

      Participants  may change  ownership  of all or part of their  Plan  shares
through a gift, sale or otherwise at any time. The Participant  must contact the
Plan  Administrator  to obtain the proper  instructions  to enact the  transfer.
Requests for transfer are subject to the same  requirements  as for the transfer
of Common Stock certificates, including the requirement of a Medallion Signature
Guarantee.

25.   If  Plan  shares  are  transferred  to  another  person,   will  the  Plan
      Administrator issue a stock certificate to the transferee?

      Transfers  can be made from Plan  account  to Plan  account  (book-to-book
transfers) or if the Participant so requests,  a stock certificate can be issued
to the transferee. The current Participant should contact the Plan Administrator
for full details on how to make the transfer.

      For  book-to-book  transfers that involve the  establishment of a new Plan
account, a new Plan Authorization Form must be completed by the transferee.  The
completed  Form must be returned to the Plan  Administrator,  along with written
instructions signed by the current Participant,  indicating the number of shares
to be transferred to the new Participant.  The current  Participant's  signature
must be guaranteed by a bank,  broker or financial  institution that is a member
of the Medallion Signature Guarantee program. The new account will be set up for
full dividend  reinvestment  unless otherwise  instructed by the previous or new
shareholder.

Termination of Plan Participation

26.   How may a Participant terminate participation in the Plan?

      Participants may terminate participation in the Plan either by selling all
the  shares in their  Plan  account  or by  having a  certificate  issued  for a
specific number of whole shares in their Plan account and selling the fractional
share balance. Certificates cannot be issued in fractional share amounts.

      To terminate Plan participation, Participants should complete and sign the
appropriate instruction form. The instruction form is a tear-off stub located at
the bottom of the Participant's account statement.  Participants should indicate
on the form that they are  terminating  their account and indicate  whether they
wish to receive a stock  certificate or sell all their shares.  The form must be
signed  by all  account  owners  and  returned  to the  Plan  Administrator  for
processing.

      A Plan  account  may also be  terminated  by the Plan  Administrator  upon
written  notice  to the  Participant  if there  is less  than  one  whole  share
remaining  in the  Participant's  Plan  account  and  the  Participant  is not a
registered  shareholder of any other shares of Company Stock for which dividends
have been designated for Plan reinvestment.

27.   Are there any Fees Charged to Plan Participants?

      If Plan shares are  purchased  on the open  market,  Participants  will be
charged a brokerage commission of $0.05 per share purchased.  If Plan shares are
purchased directly from the Company,  there is no fee charged to the Participant
for the purchase of Common Stock. There is

                                      12

<PAGE>



also a $5.00  service  fee  charged to the  Participant  for the selling of Plan
shares plus a brokerage  commission  of $0.05 per share sold.  (See  "Summary of
Plan Services and Fees to Participants".)

Reports to Participants

28.   What reports are sent to Participants?

      An  acknowledgment  will be sent to  Participants  as soon as  practicable
following  each  Optional  Cash  Investment  or sale of shares  made by the Plan
Administrator on behalf of the Participant. On a quarterly basis, in conjunction
with the reinvestment of Company Stock dividends,  each Participant will receive
a statement showing all year-to-date transaction activity. Beneficial owners who
participate  through a broker or bank nominee should  contact their  broker/bank
nominee for a statement  detailing  reinvestment  activity.  Participants should
retain these statements for tax purposes.

      All  statements  have tear-off  instruction  forms which should be used to
notify  the  Plan  Administrator  of any  certificate  issuance,  optional  cash
investments,  sales  of  Plan  shares,  termination  of  Plan  participation  or
instructions to deposit certificates for safekeeping.

      Each  participant will also be sent copies of the  communications  sent to
other  shareholders,  including the Company's annual reports,  notices of annual
meeting and proxy statements and income tax information for reporting  dividends
paid and proceeds from the sale of Plan shares.

Federal Income Taxes

29.   What are some of the tax consequences of participation in the Plan?

      In general,  dividends  which are  reinvested in accordance  with the Plan
will be taxed as cash  dividends  for  federal  income  tax  purposes  under the
provisions of the applicable tax laws.

      The  selling of shares by a  Participant  under the Plan will give rise to
capital gain or loss,  provided  such shares are held as a capital  asset by the
Participant.  The amount of any such gain or loss will be the difference between
the proceeds  received by the Participant  (net of commissions and fees) and the
Participant's  tax basis.  The tax basis of shares acquired  through the Plan is
equal to the purchase price of such shares (including brokerage  commissions and
fees,  if any).  See the answer to  Question  17 for how the  purchase  price is
determined. Any capital gain or loss will be long-, mid- or short-term according
to whether the Participant's holding period for the shares sold was greater than
18 months,  less than or equal to 18 months  but no more than one year,  or less
than or equal to one year, respectively.

      The foregoing is only a general  discussion of certain  federal income tax
aspects  of an  investment  in the  Plan.  Because  tax  consequences  may vary,
depending  on each  Participant's  own tax  situation,  Participants  or persons
considering  participation  in the Plan are  advised  to  consult  their own tax
advisors  regarding the tax effect of participation  in the Plan,  including the
application of current and proposed federal, state, local, foreign and other tax
laws.



                                      13

<PAGE>



Other Information

30.  What happens if the Company issues a stock dividend, declares a stock split
     or has a rights offering?

      All stock  dividends  or split shares  distributed  by the Company will be
credited   directly  into  the   Participant's   Plan  account.   This  includes
entitlements  on  shares  calculated  on Plan  shares  and  certificated  shares
registered in the name of the Participant. In the case of a rights offering, any
rights or shares to be distributed as a result of any rights  agreement would be
distributed  in  a  like  manner.  Transaction  processing  may  be  temporarily
suspended  during such  distributions.  Accounts coded for partial  reinvestment
will have their entitlement credited in full to the Plan.

31.   How will a Participant's shares be voted?

      For any  meeting  of Common  Stock  shareholders,  each  Participant  will
receive  proxy  materials  in order to vote Plan  account  shares as well as any
Common Stock held of record that is registered  in the name of the  Participant.
All shares will be voted as  designated  by the  Participant  or may be voted in
person at the meeting of shareholders.

32.  What are the  responsibilities  of the Company  and the Plan  Administrator
     under the Plan?

      The Company and the Plan  Administrator in administering the Plan will not
be liable for any act done in good faith or for any good faith  omission to act,
including, without limitation, (a) any claim of liability with respect to shares
of a deceased  Participant's account prior to receipt in writing of instructions
relating to the  disposition  of such shares,  (b) with respect to the prices at
which shares are purchased or sold for the  Participant's  account and the times
when such purchases or sales are made or (c) with respect to any  fluctuation in
the market value before or after any purchase or sale of shares.

33.   May the Plan be changed or discontinued?

      The Company reserves the right to amend, suspend,  terminate or modify the
Plan at any time without the approval of  Participants.  Notice of the Company's
determination to suspend, terminate or modify the Plan will be given to all Plan
Participants as soon as practicable after such determination is made.



                                      14

<PAGE>



                          DESCRIPTION OF COMMON STOCK

     General:  The Company is  presently  authorized  under its  Certificate  of
Incorporation to issue  450,000,000  shares of Common Stock, par value $0.01 per
share.

     Dividends:  Any  dividends  paid on shares of Common  Stock will be paid in
each quarterly period on the first day of February, May, August and November.

      Although the Company contemplates the payment of dividends, the payment of
future dividends is dependent upon, among other factors, action by the Company's
Board of Directors,  the Company's financial condition,  future earnings and the
availability of cash.

      Dividend Limitations:  No dividends may be declared on Common Stock unless
all past and current dividends on outstanding  Preferred Stock have been paid or
declared and set apart for payment.

      Voting Rights:  Ordinarily, the holders of the Company's Common Stock have
sole voting power to elect the Company's Directors. The Company's Certificate of
Incorporation  provides,  however, that the Board of Directors may, from time to
time,  determine the extent of the voting rights,  if any, of the shares of each
series of Preferred  Stock and  determine  whether the shares of any such series
having voting rights shall have multiple votes per share.

      Preemptive  Rights:  Holders  of the  Company's  Common  Stock do not have
preemptive  rights to purchase  additional  shares of Common Stock or securities
convertible into such shares.

      Other Rights: In the event of liquidation, the holders of the Common Stock
are entitled to all assets that remain after  satisfaction  of creditors and the
liquidation  preferences of outstanding  Preferred Stock. The outstanding shares
of Common  Stock are,  and the  additional  shares of Common  Stock which may be
offered hereby upon issuance will be, fully paid and nonassessable.

      The number,  designation,  relative rights, preferences and limitations of
the  shares of the  Preferred  Stock,  if any,  and of the  Common  Stock of the
Company are stated in full in the Company's Certificate of Incorporation.

      Listing:  The outstanding shares of Common Stock and the additional Common
Stock offered  hereby are listed on the New York Stock  Exchange and the Pacific
Stock Exchange.

     Transfer  Agent and  Registrar:  The transfer  agent and  registrar for the
Common Stock is The Bank of New York,  Shareholder Services Dept., Church Street
Station, P.O. Box 11258, New York, New York 10286-1258.



                                      15

<PAGE>



               SUMMARY OF PLAN SERVICES AND FEES TO PARTICIPANTS

      In most cases,  the Company has determined to pay the fees and expenses to
administer the Plan. However,  certain administrative service fees and brokerage
commissions will be charged  directly to the  Participant.  Set forth below is a
summary  of these  fees and  commissions  and the  party  responsible  for their
payment:

Service/Transaction                                   Cost to Participant

Initial Enrollment Fee                                $7.50
A one-time setup fee paid by persons
not currently owning Company Stock

Optional Cash Investment Transaction Fee              None  (Fee paid by the
                                                      Company)

Reinvestment of Dividends Service Fee                 None (Fee paid by the
                                                      Company)

Brokerage commissions on open market purchases        $0.05 per share

Sale of Shares Transaction Fee                        $5.00
Brokerage commissions on sale of shares               $0.05 per share

Issuance of Certificates                              None
Deposit of certificates for safekeeping               None
book-to-book transfers of shares                      None


      The minimum and maximum Cash Investments are as follows:

Initial Minimum Investments for Persons
not currently owning Company Stock                    $ 250

Minimum Optional Cash Investment for Participants     $ 25 per investment
Maximum Optional Cash Investment Per Year             $ 150,000


                                   LEGALITY

      The legality of the Common Stock  offered  hereby has been passed upon for
the Company by Leonard P. Novello, Senior Vice President and General Counsel. As
of the date of the closing of the  transactions  involving LILCO and one or both
of LIPA and KeySpan,  Mr.  Novello  owned  approximately  7,509 shares of Common
Stock.


                                    EXPERTS

     The  financial  statements  of (i) LILCO  appearing in its Annual Report on
Form  10-K/A  for the year  ended  December  31,  1996,  incorporated  herein by
reference,  and (ii) KeySpan appearing in its Annual Report on Form 10-K for the
year ended  September  30, 1997,  incorporated  herein by  reference,  have been
audited by Ernst & Young LLP and Arthur Andersen LLP, respectively, as set forth
in their reports thereon included therein and incorporated  herein by reference.
Such financial  statements are incorporated herein by reference in reliance upon
such reports given upon the authority of such firms as experts in accounting and
auditing.


                                      16

<PAGE>



      None of the experts referred to herein as having prepared or certified any
part of the  Registration  Statement were employed on a contingent  basis or, at
the time of such preparation or certification or at any time thereafter,  had or
has a substantial  interest in the  registrant or any of its  subsidiaries  as a
promoter, underwriter, voting trustee, Director, Officer or employee, except Mr.
Novello.  Mr.  Novello  is an  indemnitee  of the  Company,  being a party to an
Indemnification  Agreement.  Under the provisions of that agreement, Mr. Novello
is indemnified for any losses  associated with rendering the legality opinion to
the extent permitted under the New York Business Corporation Law (the "BCL").


                             PLAN OF DISTRIBUTION

      The shares of Common Stock offered hereby will be offered directly to Plan
participants without underwriters as described in this Prospectus.

                                      17

<PAGE>



      No  person  has been  authorized  to give any  information  or to make any
representation  other than those  contained in this  Prospectus and, if given or
made, such information or representation  must not be relied upon as having been
authorized by the Company,  The Bank of New York, or the Plan.  This  Prospectus
does not constitute an offer to sell, or a solicitation  of an offer to buy, any
securities  other than those to which it  relates,  or an offer or  solicitation
with  respect  to those  securities  to which it  relates  to any  person in any
jurisdiction  where such offer or  solicitation  would be unlawful.  Neither the
delivery  of this  Prospectus  nor any sale  made  hereunder  shall,  under  any
circumstances  create  any  implication  that  there  has been no  change in the
affairs of the Company since the date hereof or that the  information  contained
herein is correct as of any time subsequent to the date hereof.

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

                               TABLE OF CONTENTS

                  Available Information..............2
                  Incorporation of Certain
                     Documents by Reference..........2
                  The Company........................3
                  Use of Proceeds....................3
                  Description of the Plan............4
                  Description of Common Stock.......15
                  Summary of Plan Services
                    and Fees to Participants........16
                  Legality..........................16
                  Experts...........................16
                  Plan of Distribution..............17



                            MARKETSPAN CORPORATION
                              -------------------
                                Investor Program
                             --------------------
                               5,000,000 Shares
                                of Common Stock
                               ($0.01 Par Value)
                             --------------------
                                  PROSPECTUS
                             --------------------
                                 May 27, 1998


<PAGE>



                                    PART II

                   INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

Listing  Fee  --  New  York  Stock  Exchange......................$  25,650
*Accounting   Fees................................................   15,000   
*Legal Services   and    Disbursements............................   15,000
*Printing Expenses................................................  100,000
*Service   Charge including   postage--The  Bank  of  New York....  650,000
*Miscellaneous Expenses...........................................   50,000
*Total Expenses...................................................$ 855,650
- ------------------
  *  Estimated.
- ------------------


Item 15.    Indemnification of Directors and Officers.

      Sections  721-726 of Article 7 of the BCL provide for the  indemnification
and advancement of expenses to officers and directors. Section 721 provides that
indemnification  and  advancement  pursuant to the BCL are not  exclusive of any
other  rights an  officer or  director  may be  entitled  to,  provided  that no
indemnification  may be made to or on behalf of any  director  or  officer  if a
judgment  or  other  final  adjudication  adverse  to the  director  or  officer
establishes  that his acts were  committed  in bad  faith or were the  result of
active and  deliberate  dishonesty  and were  material to the cause of action so
adjudicated,  or that he personally  gained in fact a financial  profit or other
advantage  to which he was not legally  entitled.  Section 722  provides  that a
corporation  may  indemnify an officer or  director,  in the case of third party
actions,  against  judgments,  fines,  amounts paid in settlement and reasonable
expenses  and,  in the  case of  derivative  actions,  against  amounts  paid in
settlement and reasonable expenses,  provided that the director or officer acted
in good  faith,  for a purpose  which he  reasonably  believed to be in the best
interests  of the  corporation  and,  in the case of  criminal  actions,  had no
reasonable  cause to believe his conduct was  unlawful.  In addition,  statutory
indemnification  may not be provided in derivative actions (i) which are settled
or  otherwise  disposed of or (ii) in which the  director or officer is adjudged
liable to the corporation, unless and only to the extent a court determines that
the person is fairly and reasonably entitled to indemnity.  Section 723 provides
that statutory  indemnification  is mandatory  where the director or officer has
been  successful,  on the  merits or  otherwise,  in the  defense  of a civil or
criminal  action or  proceeding.  Section  723 also  provides  that  expenses of
defending  a civil or  criminal  action or  proceeding  may be  advanced  by the
corporation  upon receipt of an  undertaking  to repay them if and to the extent
the recipient is ultimately found not to be entitled to indemnification. Section
725 provides for  repayment of such  expenses  when the  recipient is ultimately
found  not to be  entitled  to  indemnification.  Section  726  provides  that a
corporation may obtain  indemnification  insurance  indemnifying  itself and its
directors and officers.  The Company has in effect insurance  policies providing
both  directors  and officers  liability  coverage and  corporate  reimbursement
coverage.

      Section  402(b) of the BCL provides that a corporation  may include in its
certificate of incorporation a provision  limiting or eliminating,  with certain
exceptions,  the  personal  liability  of  directors  to a  corporation  or  its
shareholders for damages for any breach of duty in such capacity.

                                     II-1

<PAGE>



The Company's  Certificate of  Incorporation  eliminates  personal  liability of
Directors to the extent permitted by New York law.

      The Company's  Certificate of  Incorporation  provides  generally that the
Company shall,  except to the extent expressly  prohibited by the BCL, indemnify
each of its officers and directors  made or threatened to be made a party to any
action,  suit  or  proceeding,  or  appeal  thereof,  whether  civil,  criminal,
administrative or investigative by reason of the fact that such person is or was
a director or officer of the Company  against all  expense,  liability  and loss
(including,  but not limited to, all attorneys' fees,  judgments,  fines,  ERISA
excise  taxes  or  penalties  and  amounts  paid or to be  paid  in  settlement)
reasonably  incurred or suffered by such  person in  connection  therewith.  The
Company's  Certificate of  Incorporation  further  provides for  advancement and
reimbursement  of such expenses  incurred by an officer or director in defending
any  action or  proceeding  in  advance of the final  disposition  thereof  upon
receipt of an  undertaking  by such  person to repay such  amount if, and to the
extent  that,   such  person  is   ultimately   found  not  to  be  entitled  to
indemnification.

Item 16.    List of Exhibits.  (See "Exhibit Index")

Item 17.    Undertakings.

      The  undersigned  registrant  hereby  undertakes  that,  for  purposes  of
determining any liability under the Securities Act of 1933, each report filed by
the  Company  pursuant  to  Section  13(a) or  Section  15(d) of the  Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the  Registration  Statement shall be
deemed to be a new  Registration  Statement  relating to the securities  offered
therein,  and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

      Insofar as  indemnification  for liabilities  arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the Company pursuant to the foregoing provisions,  or otherwise, the Company has
been  advised  that in the  opinion of the SEC such  indemnification  is against
public policy as expressed in the Act and is, therefore,  unenforceable.  In the
event that a claim for indemnification  against such liabilities (other than the
payment by the  Company of expenses  incurred or paid by a director,  officer or
controlling person of the Company in the successful defense of any action,  suit
or proceeding) is asserted by such  director,  officer or controlling  person in
connection  with  the  securities  being  registered  under  this   Registration
Statement, the Company will, unless in the opinion of its counsel the matter has
been  settled  by  controlling  precedent,  submit  to a  court  of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

      The undersigned registrant hereby undertakes:

      (1) To file,  during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

          (i) To include  any  prospectus  required  by Section  10(a)(3) of the
     Securities Act of 1933;

          (ii) To reflect in the  prospectus  any facts or events  arising after
     the  effective  date of the  registration  statement  (or the  most  recent
     post-effective amendment thereof) which,

                                     II-2

<PAGE>



individually  or in  the  aggregate,  represent  a  fundamental  change  in  the
information set forth in the registration statement;

            (iii) To include any material  information  with respect to the plan
of distribution not previously  disclosed in the  registration  statement or any
material change to such  information in the  registration  statement;  provided,
however,  that  paragraphs  (1)(i) and (1)(ii) do not apply if the  registration
statement  is on  Form  S-3 or Form  S-8,  and the  information  required  to be
included in a  post-effective  amendment  by those  paragraphs  is  contained in
periodic reports filed by the registrant pursuant to Section 13 or Section 15(d)
of the Securities Exchange Act of 1934 that are incorporated by reference in the
registration statement.

      (2)  That,  for  the  purpose  of  determining  any  liability  under  the
Securities Act of 1933,  each  post-effective  amendment shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

      (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

                                     II-3

<PAGE>


                                      SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  or amendment  thereto to be signed on its behalf by the  undersigned,
thereunto  duly  authorized,  in  Hicksville,  in the Town of Oyster Bay and the
State of New York, on the 22nd day of May, 1998.

                                                      MARKETSPAN CORPORATION


                                                By:   /s/ Craig G. Matthews 
                                                ----------------------------
                                                      CRAIG G. MATTHEWS
                                                      (Executive Vice President,
                                                      Chief Financial Officer)

      Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
Registration  Statement  or amendment  thereto has been signed by the  following
persons in the capacities and on the date indicated.

      Signatures                    Title                         Date
                                                            -
    WILLIAM J. CATACOSINOS    Principal Executive Officer   |
    -----------------------   and Director                  |
   *WILLIAM J. CATACOSINOS                                  |
    (Chairman of the Board, Chief                           |
     Executive Officer)                                     |
                                                            |
                                                            |
    /s/ Craig G. Matthews     Principal Financial Officer   |
    -----------------------                                 |
    CRAIG G. MATTHEWS                                       |
    (Executive Vice President,                              |
     Chief Financial Officer)                               |
                                                            |
                                                            |
    /s/ Joseph E. Fontana     Principal Accounting Officer  |
    -----------------------                                 |
    JOSEPH E. FONTANA                                       |
    (Vice President,                                        |     May 27, 1998
     Chief Accounting Officer                               |
     and Controller)                                        |
                                                            |
                                                            |
WILLIAM J. CATACOSINOS*,      *Directors                    |
ROBERT B. CATELL*                                           |
                                                            |
                                                            |
                                                            |
      By:   /s/ Craig G. Matthews                           |
      ---------------------------                           |
            *CRAIG G. MATTHEWS                              |
            (Attorney-in-fact for each                      |
            of the persons indicated)                       |
                                                            -


                              /s/ Craig G. Matthews
                              ---------------------
                              CRAIG G. MATTHEWS (On behalf of
                              the issuer, individually, and as an
                              officer and as attorney-in-fact
                              for each of the persons indicated)

      Original powers of attorney, authorizing Craig G. Matthews and Kathleen A.
Marion and each of them, to sign the  Registration  Statement and any amendments
thereto, as attorney-in-fact  for the Directors and Officers of the Company, and
a certified  copy of the  resolution  of the Board of  Directors  of the Company
authorizing said persons and each of them to sign the Registration Statement and
amendments thereto as attorney-in-fact for any Officers signing on behalf of the
Company,  are being  filed or will be filed  with the  Securities  and  Exchange
Commission.

                                         II-4

<PAGE>


                                 EXHIBIT INDEX





Exhibits  listed  below which have been filed with the  Securities  and Exchange
Commission pursuant to the Securities Act of 1933 or the Securities Exchange Act
of 1934,  and which  were  filed as noted  below,  are  hereby  incorporated  by
reference  and  made a part of this  report  with the  same  effect  as if filed
herewith.

4(a) Certificate of  Incorporation  of BL Holding Corp., now known as MarketSpan
     Corporation,   dated  April  15,  1998  and  Amendment  to  Certificate  of
     Incorporation  of the  Company  dated May 21,  1998  (filed May 26, 1998 as
     Exhibit 1 to the Company's Form 8-A12b)

4(b) By-laws of the Company  (filed May 26,  1998 as Exhibit 2 to the  Company's
     Form 8-A12b)

*5   Opinion of Leonard P. Novello, Senior Vice President and General Counsel of
     the  Company,  with  respect  to  the  legality  of  the  securities  being
     registered.

*23(a) Consent of Ernst & Young LLP, Independent Auditors.

*23(b) Consent of Arthur Andersen LLP, Independent Auditors.

*24(a) Powers of Attorney  executed by the Directors and certain Officers of the
       Company.

*24(b) Certificate as to Corporate Power of Attorney.

*24(c) Certified copy of Resolution of Board of Directors  authorizing signature
       pursuant to Power of Attorney.

- ------------------
*Filed Herewith



                                     EI-1


                            MARKETSPAN CORPORATION
                           175 EAST OLD COUNTRY ROAD
                          HICKSVILLE, NEW YORK 11801

                                                                     EXHIBIT 5


                                                      May 22, 1998


MarketSpan Corporation
175 East Old Country Road
Hicksville, New York 11801

            Re:   INVESTOR PROGRAM

Gentlemen:

     As Senior Vice  President and General  Counsel for  MarketSpan  Corporation
(the  "Company"),  I am familiar  with the  proposal of the Company to issue and
sell shares of its Common Stock par value $0.01 per share (the  "Common  Stock")
pursuant to an Investor Program (the "Plan"). In connection with the proceedings
before the Securities and Exchange  Commission  with respect  thereto,  I submit
this  opinion  and  hereby  consent  to its use as  Exhibit  5 to the  Company's
Registration Statement on Form S-3 (the "Registration Statement") proposed to be
filed by the Company under the  Securities  Act of 1933, as amended,  and to the
use of my name in said Registration  Statement and the Prospectus forming a part
thereof (the "Prospectus").

      I am familiar with the  Certificate  of  Incorporation  and By-Laws of the
Company,  as well as the Registration  Statement and the Prospectus  relating to
the Plan.

      Based upon the foregoing and upon my general  familiarity with the affairs
of the Company, I advise you that in my opinion:

     1. The Company is a corporation  duly organized and validly  existing under
the laws of the State of New York.

     2. No state regulatory body or agency has jurisdiction over the transaction
proposed by the Company or any part thereof.

      3. No federal  commission or agency other than the Securities and Exchange
Commission,  under the Securities Act of 1933, as amended, has jurisdiction over
the transaction proposed by the Company or any part thereof.

      4. All action  necessary to make valid the issuance and sale of the Common
Stock will have been taken when (a) the Registration Statement shall have become
effective;  (b)  the  Board  of  Directors  of  the  Company  shall  have  taken
appropriate  action to approve and authorize the issuance and sale of the Common
Stock on the terms set forth in the Registration Statement;


<PAGE>


MARKETSPAN CORPORATION
May 22, 1998
Page Two


and (c) the Company  shall have  received the full  consideration  therefor (not
less than $0.01 per share).

      5. When the  foregoing  steps shall have been taken,  the Common Stock (a)
will conform in all substantial  respects to the description of the Common Stock
contained  in the  Registration  Statement  and (b) will be legally  and validly
issued, fully paid and nonassessable.

     6. The  offering of the Common  Stock is not subject to  preemptive  rights
under the laws of the State of New York.

                                Very truly yours,

                                /s/ Leonard P. Novello

                                Leonard P. Novello
                                Senior Vice President and
                                General Counsel


Consent of Independent Auditors

We  consent  to the  reference  to our firm under the  caption  "Experts  in the
Registration   Statement  (Form  S-3)  and  related   Prospectus  of  MarketSpan
Corporation for the  registration of 5,000,000 shares of its common stock and to
the  incorporation  by referfence  therein of our report dated January 31, 1997,
with respect to the financial  statements  and schedule of Long Island  Lighting
Company  included in its Annual Report (Form 10-K/A) for the year ended December
31, 1996, filed with the Securities and Exchange Commission.

                                        /s/ Ernst & Young LLP
Melville, New York
May 22, 1998 


May 26, 1998

MarketSpan Corporation
175 East Old Country Road
Hicksville, NY  11801

Gentlemen:

We are aware that MarketSpan  Corporation  has  incorporated by reference in its
current  Registration  Statement on Form S-3, The Brooklyn  Union Gas  Company's
Form 10-Q for the quarters  ended March 31, 1997 and June 30, 1997,  and KeySpan
Energy  Corporation's  Form 10-Q for the  quarters  ended  December 31, 1997 and
March 31, 1998 which  include our reports  dated April 23, 1997,  July 23, 1997,
January  22,  1998 and April 30,  1998,  respectively,  covering  the  unaudited
interim financial information contained therein. Pursuant to Regulation C of the
Securities Act of 1933, our report is not considered a part of the  registration
statement prepared or certified by our firm or a report prepared or certified by
our firm within the meaning of Sections 7 and 11 of the Act.

Very truly yours,

/s/ Arthur Andersen LLP

ARTHUR ANDERSEN LLP


                                                                 Exhibit 24(a)




                                                        Registration Statement


                            Marketspan Corporation

                      Certificate as to Power of Attorney



      WHEREAS,   MarketSpan   Corporation  (the   "Corporation"),   a  New  York
corporation,  intends to file with the Securities and Exchange  Commission under
the  Securities  Exchange  Act of 1933,  as  amended,  (the  "Act")  one or more
Registration Statements on Form S-3 covering the registration under the Act, and
the rules and regulations thereunder, of the Common Stock of the Corporation, to
be issued on a  continuous  basis under an investor  common  stock  issuance and
dividend reinvestment, and

      WHEREAS,  the Corporation intends to file with the Securities and Exchange
Commission  under  the Act  one or  more  Registration  Statements  on Form  S-8
covering  the  registration  under  the  Act,  and  the  rules  and  regulations
thereunder,  of the Common Stock of the  Corporation,  to be issued to employees
and/or directors pursuant to one or more stock purchase plans.

            NOW, THEREFORE,  in my capacity as Corporate Secretary of MarketSpan
Corporation,  I do hereby  certify that Craig G. Matthews has been  appointed by
the Board of Directors of MarketSpan  Corporation  with power to execute,  among
other  documents,  said  Report,  any  amendment  to said  Report  and any other
documents  required  in  connection  therewith,  and to file the  same  with the
Securities and Exchange Commission.

            WITNESS  my hand and the seal of the  Corporation  this  21st day of
May, 1998.



                                                /S/ KATHLEEN A. MARION
                                                ----------------------
                                                KATHLEEN A. MARION
                                                Corporate Secretary



(Corporate Seal)



<PAGE>



                                                                 Exhibit 24(b)


                                                        Registration Statement


                            MarketSpan Corporation

                               Power of Attorney


      WHEREAS,   MarketSpan   Corporation  (the   "Corporation"),   a  New  York
corporation,  intends to file with the Securities and Exchange  Commission under
the  Securities  Exchange  Act of 1933,  as  amended,  (the  "Act")  one or more
Registration Statements on Form S-3 covering the registration under the Act, and
the rules and regulations thereunder, of the Common Stock of the Corporation, to
be issued on a  continuous  basis under an investor  common  stock  issuance and
dividend reinvestment, and

      WHEREAS,  the Corporation intends to file with the Securities and Exchange
Commission  under  the Act  one or  more  Registration  Statements  on Form  S-8
covering  the  registration  under  the  Act,  and  the  rules  and  regulations
thereunder,  of the Common Stock of the  Corporation,  to be issued to employees
and/or directors pursuant to one or more stock purchase plans.

      NOW, THEREFORE, in my capacity either as a director or officer, or both as
the case may be, of the  Corporation,  I do hereby appoint CRAIG G. MATTHEWS and
KATHLEEN A. MARION,  and each of them severally,  as my  attorneys-in-fact  with
power to execute  in my name and  place,  and in my  capacity  as a director  or
officer,  or both as the  case may be,  of the  Corporation,  such  registration
statements,  any  amendment  to  such  registration  statements  and  any  other
documents  required  in  connection  therewith,  and to file the  same  with the
Securities and Exchange Commission.

      IN WITNESS  WHEREOF,  I have executed this power of attorney this 21st day
of May, 1998.




                           /S/ WILLIAM J. CATACOSINOS
                           --------------------------
                        WILLIAM J. CATACOSINOS, Director


<PAGE>




                                                                 Exhibit 24(b)

                                                        Registration Statement


                            MarketSpan Corporation

                               Power of Attorney


      WHEREAS,   MarketSpan   Corporation  (the   "Corporation"),   a  New  York
corporation,  intends to file with the Securities and Exchange  Commission under
the  Securities  Exchange  Act of 1933,  as  amended,  (the  "Act")  one or more
Registration Statements on Form S-3 covering the registration under the Act, and
the rules and regulations thereunder, of the Common Stock of the Corporation, to
be issued on a  continuous  basis under an investor  common  stock  issuance and
dividend reinvestment, and

      WHEREAS,  the Corporation intends to file with the Securities and Exchange
Commission  under  the Act  one or  more  Registration  Statements  on Form  S-8
covering  the  registration  under  the  Act,  and  the  rules  and  regulations
thereunder,  of the Common Stock of the  Corporation,  to be issued to employees
and/or directors pursuant to one or more stock purchase plans.

      NOW, THEREFORE, in my capacity either as a director or officer, or both as
the case may be, of the  Corporation,  I do hereby appoint CRAIG G. MATTHEWS and
KATHLEEN A. MARION,  and each of them severally,  as my  attorneys-in-fact  with
power to execute  in my name and  place,  and in my  capacity  as a director  or
officer,  or both as the  case may be,  of the  Corporation,  such  registration
statements,  any  amendment  to  such  registration  statements  and  any  other
documents  required  in  connection  therewith,  and to file the  same  with the
Securities and Exchange Commission.

      IN WITNESS  WHEREOF,  I have executed this power of attorney this 21st day
of May, 1998.


                                     /S/ ROBERT B. CATELL
                                     --------------------
                                    ROBERT B. CATELL, Director


<PAGE>


                                                                 Exhibit 24(c)



                                                        Registration Statement



                            MarketSpan Corporation


      I, KATHLEEN A. MARION,  Corporate Secretary of MarketSpan Corporation (the
"Corporation"), a New York corporation, DO HEREBY CERTIFY that annexed hereto is
a true, correct and complete copy of the resolution adopted by Unanimous Written
Consent of the Board of Directors of the Corporation on May 21, 1998.
      AND I DO FURTHER CERTIFY that the foregoing resolution has not been in any
way amended,  annulled,  rescinded or revoked and that the same is still in full
force and effect.
      WITNESS  my hand and the  seal of the  Corporation  this  21st day of May,
1998.


                                                /S/ KATHLEEN A. MARION
                                                ----------------------
                                                KATHLEEN A. MARION
                                                Corporate Secretary


(Corporate Seal)


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