KEYSPAN CORP
S-3/A, 2000-12-13
NATURAL GAS DISTRIBUTION
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As Filed with the  Securities  and  Exchange  Commission  on  December  13, 2000
                                                  Registration  No. 333-53657
--------------------------------------------------------------------------------



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                         -------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 1 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      under
                           THE SECURITIES ACT OF 1933

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

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



                                    NEW YORK
                            (State of incorporation)
                                   11-3431358
                     (I.R.S. employer identification number)


                            STEVEN L. ZELKOWITZ, ESQ.
                 ONE METROTECH CENTER, BROOKLYN, NEW YORK 11201
              175 EAST OLD COUNTRY ROAD, HICKSVILLE, NEW YORK 11801
                            (718) 403-1000 (BROOKLYN)
                           (516) 755-6650 (HICKSVILLE)

  (Address,   including  zip  code,  and  telephone number, including area code,
   of  registrant's principal  executive  offices  and  agent  for service)

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

           APPROXIMATE  DATE OF  COMMENCEMENT  OF PROPOSED SALE TO PUBLIC:  From
time to time after this  Registration  Statement becomes effective as determined
by market conditions.

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


           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, check the following box. |X|

           If this  form is  filed  to  register  additional  securities  for an
offering  pursuant to Rule 462(b)  under the  Securities  Act,  please check the
following box and list the Securities Act  registration  statement number of the
earlier effective registration statement for the same offering. |_|

           If this form is a  post-effective  amendment  filed  pursuant to Rule
462(C) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. |_|

           If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. |_|

           THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE
OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE  DATE UNTIL THE  REGISTRANTS
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 OR UNTIL THIS  REGISTRATION  STATEMENT SHALL BECOME EFFECTIVE
ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION,  ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.

           This  Post  Effective  Amendment  No.  1  to  Form  S-3  Registration
Statement  (333-53657)  is being  filed to amend the  current  KeySpan  Investor
Program prospectus.  The accompanying prospectus supersedes the Investor Program
prospectus and prospectus  supplements  which were filed with the Securities and
Exchange Commission on May 27, 1998, August 12, 1999 and December 6, 1999.



           The  registration  fee was paid at the time of the original filing of
the Form S-3 Registration Statement.

<PAGE>




[GRAPHIC_OMITTED]




KeySpan Corporation




                                INVESTOR PROGRAM

                                  COMMON STOCK,
                           $0.01 PAR VALUE, PER SHARE

                                5,000,000 SHARES




Our Common Stock is primarily  listed on the New York Stock  Exchange  under the
symbol KSE.  Investing in KeySpan's  Common Stock involves risks associated with
market fluctuations.


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 January 1, 2001



<PAGE>


<TABLE>
                                                             TABLE OF CONTENTS
<CAPTION>
                                                                                                          Page
<S>                                                                                                          <C>
About this Prospectus.........................................................................................

Profile of KeySpan Corporation................................................................................

Investor Program Highlights...................................................................................

Description of the Program....................................................................................

      Summary.................................................................................................

      Questions and Answers...................................................................................

           Purpose............................................................................................

           Advantages and Disadvantages.......................................................................

           Program Administration.............................................................................

           Eligibility........................................................................................

           Enrollment Procedure...............................................................................

           Common Stock Purchases.............................................................................

           Stock Certificates and Safe Keeping................................................................

           Sale of Shares.....................................................................................

           Transfer of Shares.................................................................................

           Option Changes and Discontinuation of Reinvestment.................................................

           Reports to Participants............................................................................

           Federal income Taxes...............................................................................

           Other Information..................................................................................

Use of Proceeds...............................................................................................

Plan of Distribution

Legal Opinions................................................................................................

Experts.......................................................................................................

Incorporation of Documents by Reference.......................................................................

</TABLE>




<PAGE>





                              ABOUT THIS PROSPECTUS

      As used in this  prospectus and any prospectus  supplement,  except as the
context  otherwise  requires,  "we," "us," "our,"  "Company," and "KeySpan" mean
KeySpan Corporation.

     This prospectus  supersedes the Investor Program  prospectus and prospectus
supplements which were filed with the Securities and Exchange  Commission on May
27, 1998, August 12, 1999 and December 6, 1999. Approximately 2.7 million shares
have been issued under the Investor  Program from May 27, 1999 through  December
31, 2000.



                         PROFILE OF KEYSPAN CORPORATION

      KeySpan Corporation, a New York corporation,  was formed in May 1998, as a
result of the business combination of KeySpan Energy Corporation,  the parent of
The  Brooklyn  Union Gas  Company,  and  certain  businesses  of the Long Island
Lighting  Company.  On November  8, 2000,  we acquired  Eastern  Enterprises,  a
Massachusetts  business trust, and the parent of several gas utilities operating
in Massachusetts.  Also on November 8, 2000, Eastern acquired EnergyNorth, Inc.,
the parent of a gas utility  operating in central New Hampshire.  As a result of
the  acquisitions,  we now  haves  assets  of more  than  $10  billion  and have
increased our customer base by approximately 800,000 New England customers,  for
a total of 2.4 million gas customers throughout the Northeast.

      Our core business is gas distribution,  conducted by our six regulated gas
utility  subsidiaries:  The  Brooklyn  Union Gas Company  d/b/a  KeySpan  Energy
Delivery New York and KeySpan Gas East Corporation d/b/a KeySpan Energy Delivery
Long Island distribute gas to customers in the Boroughs of Brooklyn,  Queens and
Staten  Island in New York City and the  Counties  of Nassau and Suffolk on Long
Island,  respectively;  Boston Gas  Company,  Colonial Gas Company and Essex Gas
Company, each doing business as KeySpan Energy Delivery New England,  distribute
gas to customers in eastern and central  Massachusetts;  and EnergyNorth Natural
Gas, Inc. d/b/a KeySpan Energy Delivery New England distributes gas to customers
in central New Hampshire. throughout the Northeast.

      We are also a major,  and growing,  generator of  electricity.  We own and
operate five large  generating  plants and 42 smaller  facilities  in Nassau and
Suffolk Counties on Long Island and lease and operate a major facility in Queens
County in New York City.  Under  contractual  arrangements,  we  provide  power,
electric  transmission  and  distribution  services,  billing and other customer
services for  approximately  one million  electric  customers of the Long Island
Power Authority on Long Island.

      Our  other  subsidiaries  are  involved  in oil  and gas  exploration  and
production;  gas  storage;  wholesale  and  retail gas and  electric  marketing;
appliance service;  heating,  ventilation and air conditioning  installation and
services;   large   energy-system   ownership,   installation   and  management;
telecommunications;   energy-related  internet  activities;  fuel  cells;  water
barging   activities,   including   the   hauling  of  fuel  and  other   cargo;
transportation  by truck of liquid natural gas and propane;  and providing meter
reading  equipment and services to municipal  utilities.  We also invest in, and
participate in the development of, pipelines and other energy-related  projects,
domestically and internationally.




                                        1

<PAGE>



      We are a  registered  holding  company  under the Public  Utility  Holding
Company  Act of  1935,  as  amended.  Therefore,  our  corporate  and  financial
activities  and  those  of our  subsidiaries  (including  their  ability  to pay
dividends  to us) are  subject to  regulation  by the  Securities  and  Exchange
Commission.  Under  our  holding  company  structure,  we  have  no  independent
operations or source of income of our own and conduct  substantially  all of our
operations  through our subsidiaries and, as a result, we depend on the earnings
and cash flow of, and  dividends or  distributions  from,  our  subsidiaries  to
provide  the  funds  necessary  to meet our debt  and  contractual  obligations.
Furthermore, a substantial portion of our consolidated assets, earnings and cash
flow is derived from the operations of our regulated utility subsidiaries, whose
legal authority to pay dividends or make other distributions to us is subject to
regulation by state regulatory authorities.



                                        2

<PAGE>




                           INVESTOR PROGRAM HIGHLIGHTS

      We are pleased to offer you the  opportunity to participate in the KeySpan
Investor  Program  (the  "Program"),   a  direct  stock  purchase  and  dividend
reinvestment plan. The Program is designed to provide you with:

      o         A convenient and  inexpensive way to purchase and sell shares of
                KeySpan common stock ("Common Stock").

      o         The chance to purchase additional shares of Common Stock, and to
                reinvest all or a portion of your cash dividends.

      o         The  opportunity  to make  additional  cash  purchases of Common
                Stock by check,  money order or  automatic  deduction  from your
                checking  or  savings  account  at  a  U.S.  bank  or  financial
                institution.

      o         An option to own and transfer  shares of Common  Stock  without
                the need for holding stock certificates.

                             PROGRAM ADMINISTRATION

      We have appointed EquiServe Trust Company N.A., ("EquiServe") as our trust
agent to administer  the Program.  All purchases of Common Stock will be made by
EquiServe  at  100%  of the  then-current  market  price  of the  Common  Stock,
calculated  as  described  in this  prospectus,  either in the open  market,  or
directly from KeySpan.

      Our Common Stock is listed on the New York Stock Exchange under the symbol
KSE.  Investing in KeySpan's  Common Stock involves risks associated with market
fluctuations.

      To the extent  required by law, in certain  jurisdictions,  shares offered
through  the  Program  will be offered  through a  registered  broker/dealer  to
persons who are not currently KeySpan shareholders.


                                        3

<PAGE>




                           DESCRIPTION OF THE PROGRAM

SUMMARY

      This summary highlights selected information from this prospectus, but may
not contain all of the information that is important to you. To fully understand
the  Program  and for a more  complete  description  of the  legal  terms of the
Program,  you should read this entire  document  carefully  and the documents to
which we have referred you. To find out how to obtain copies of these documents,
see Question 29.

      PURPOSE OF THE PROGRAM

      The  purpose  of the  Program is to provide  our  Registered  Shareholders
(shareholders  whose stock is  registered  in their  name,  not in the name of a
broker),  our  customers  and  other  investors  with a simple,  convenient  and
economical  way to make and  increase  investments  in our  Common  Stock and to
reinvest all or a portion of any cash  dividends  paid in  additional  shares of
Common Stock. The Program also provides  participants  with an economical method
to sell shares of Common Stock.

      HOW TO PARTICIPATE IN THE PROGRAM

           NEW INVESTORS

       o  If you are not  currently a KeySpan  shareholder,  you can  purchase
          Common  Stock for the first  time with a minimum  investment  of $250,
          with no fee. New investors may make their initial investment in Common
          Stock by completing an Initial  Investment  Form and either mailing it
          with a check or money order for at least $250, or, alternatively,  you
          can  authorize   EquiServe  to   automatically   deduct  your  initial
          investment  from a  checking  or  savings  account  at a U.S.  bank or
          financial  institution.  The automatic deduction feature also provides
          new  investors  with the  option of having a minimum  of $25  deducted
          either  monthly  or  semi-monthly,  in  order  to  reach  the  minumum
          investment of $250.  However, it will be necessary to notify Equiserve
          to stop making automatic deductions.

       o  New investors can also enroll on the Internet at Equiserve's website
          at  www.equiserve.com  or the investor  relations section of KeySpan's
          website at www.keyspanenergy.com.

       o  New investors can reinvest their  dividends by checking the dividend
          reinvestment  option on the  Initial  Investment  Form,  or by calling
          EquiServe.

           REGISTERED SHAREHOLDERS

           o    If you are a  Registered  Shareholder,  you may make  additional
                investments  (minimum of $25,  annual  maximum of  $150,000)  by
                check, money order or by authorizing  EquiServe to automatically
                deduct your  investment  from a checking or savings account at a
                U.S. bank or financial institution.

           o    Registered  Shareholders wishing to change dividend reinvestment
                options may do so by  completing  and  submitting  an Enrollment
                Authorization Form.






                                        4

<PAGE>



                           NON-REGISTERED SHAREHOLDERS

           o    KeySpan  shareholders  holding their stock through a broker must
                become Registered Shareholders to enroll in the Program.

      FOR FURTHER INSTRUCTIONS ON HOW TO PARTICIPATE IN THE PROGRAM,  PLEASE SEE
QUESTION 7 BELOW.


      FEATURES OF THE PROGRAM

      o         Automatically  reinvest all or part of your cash  dividends to
                purchase additional shares.

      o         You do not  need to  reinvest  your  dividends  to  participate.
                Dividends  not  reinvested  can  be  paid  to you  by  check  or
                electronic deposit to your bank account.

      o         You  may  sell  your  shares  of  Common  Stock  by  instructing
                EquiServe,  either by  telephone,  in  writing,  or through  the
                Internet. Sale orders are processed daily.

      o         You may transfer shares or make gifts of shares of Common Stock
                easily and at no cost.

      o         You may make  all  account  inquiries  by  telephone,  writing,
                and/or via the Internet.

      o         Cash investments are processed weekly, usually on Thursdays.

      o         Your whole and fractional shares of Common Stock are credited to
                your Program  account in safe and  convenient  book-entry  form.
                However, you may request stock certificates free of charge.

      o         For safekeeping  purposes,  stock  certificates can be converted
                into book-entry  shares,  which will be credited to your Program
                account at no cost to you.



      FEES AND COMMISSIONS

      o         KeySpan pays all processing fees for initial  investments in the
                Program, for additional  investments and dividend  reinvestments
                processed  as  original  issue or  treasury  shares  and for the
                annual maintenance cost of your Program account.

      o         You will be charged  only the  transaction  and  brokerage  fees
                (currently  $5.00 per  transaction  and $0.05 per  share) on the
                sale  of  shares  of  Common  Stock  through  the  Program,  and
                brokerage  commissions  on all purchases  made using open market
                shares (which is currently $0.05 per share).

      o         Returned checks or failed automatic deduction transactions will
                result in a charge of $20 to the participant.

      o         You will be charged $5.00 per year (not to exceed $25.00) for a
                duplicate statement older than two calendar years.


                                        5

<PAGE>



QUESTIONS AND ANSWERS

      The following is a question and answer format  explanation  of the Program
which provides the terms and conditions of the Program.


      PURPOSE

      1.        What is the purpose of the Program?

                The purpose of the Program is to provide Registered Shareholders
                of  Common  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
                Program also provides  participants with an economical method to
                sell shares of Common Stock.


      ADVANTAGES AND DISADVANTAGES

      2.        What are the advantages of the Program?

                The advantages of the Program are as follows:

                o    DIRECT  PURCHASE OF INITIAL  SHARES:  Persons not presently
                     owning  shares of Common Stock may enroll in the Program by
                     making an initial investment of at least $250, but not more
                     than $150,000.

                o    REINVESTMENT  OF  DIVIDENDS:   Participants   may  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    DIRECT  PURCHASE OF COMMON STOCK  THROUGH  ADDITIONAL  CASH
                     INVESTMENTS: Participants may purchase additional shares of
                     Common  Stock by  making  additional  cash  investments  by
                     check, money order or electronic  transfer in amounts of at
                     least  $25  per  investment,   with  a  maximum   allowable
                     investment of $150,000 per year.

                o    CERTIFICATE SAFEKEEPING: The Program offers a "safekeeping"
                     service free of charge, whereby Registered Shareholders may
                     deposit their Common Stock  certificates with Equiserve and
                     have their  certificated  shares  credited to their Program
                     account.  This feature  prevents  stock  certificate  loss,
                     theft or destruction. Since deposited shares become Program
                     shares, they may be transferred or sold through the Program
                     in a convenient and economical manner.

                o    REDUCED FEES: Fees charged to participants are usually less
                     than if the  individual  investor  purchased or sold shares
                     outside of the Program through a broker.

                o    CERTIFICATES/TRANSFER  OR SHARES:  Participants may request
                     the issuance of stock  certificates  or transfer to another
                     participant  all or a portion of their Program  shares free
                     of charge.  Stock certificates will only be issued in whole
                     share amounts.


                                        6

<PAGE>




                o    CONVENIENT,  INEXPENSIVE  SALE OF SHARES:  Participants may
                     sell Program shares by providing  written  instructions  to
                     EquiServe , by using the automated  telephone sales feature
                     or via the Internet.  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
                     Program   accounts,   providing  a  simplified   method  of
                     recordkeeping.

      3.        What are the Disadvantages of the Program?

                The disadvantages of the Program are as follows:

                o    NO INTEREST PAID ON FUNDS PENDING  INVESTMENT:  No interest
                     is paid on dividends or optional cash  investments  held by
                     EquiServe 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 Program 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.


      PROGRAM ADMINISTRATION

      4.        Who administers the Program?

                EquiServe  has  been  appointed  as  our  transfer   agent,   to
                administer   the  Program.   EquiServe's   responsibilities   in
                administering the Program include:

                o Determining  the timing and the making of purchases of Common
                  Stock on the open market
                o Crediting participant's accounts with shares of Common Stock
                  acquired under the Program
                o Maintaining Program account records o Sending  statements of
                  Program account activity to participants.


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

                You may contact EquiServe by writing to:

                                    EquiServe
                                  P.O. Box 2598
                           Jersey City, NJ 07303-2598

                You may also contact  EquiServe at one of the telephone  numbers
listed below:

               o    Shareholder  customer  service,  including  sale of  shares:
                    1-800-482-3638    (within   the   U.S.   and   Canada)   and
                    1-201-324-0498 (outside the U.S. and Canada).



                                        7

<PAGE>



     o    New investors requesting Program material:  1-800-948-1691  (available
          24 hours, 7 days a week) and TDD: 1-201-222-4955 (a telecommunications
          device for the hearing impaired is available).

          You may also contact EquiServe via the Internet.  EquiServe's Internet
          address is  www.equiserve.com.  Messages sent via the Internet will be
          responded to promptly.  At  EquiServe's  website,  you can access your
          share balance,  sell shares,  request a stock certificate,  and obtain
          online forms and other information about your Program account.  To get
          access to your Program account, you will require a password which will
          be sent to you, or you can request your password by calling  toll-free
          1-877-THE-WEB7 (1-877-843-9327).


      ELIGIBILITY

      6.        Am I eligible to participate in the Program?


                Any person or entity is eligible to  participate in the Program,
                whether or not you currently own our Common Stock.  If you are a
                resident  of a  foreign  country,  you  should  make  sure  that
                participation would not violate any laws in the country in which
                you reside.


      ENROLLMENT PROCEDURES

      7.        How do I become a Program participant?

                O     NEW  INVESTORS.  If you do not  currently  own our  Common
                      Stock  you may  enroll in the  Program  by  completing  an
                      Initial  Investment  Form.  You must return the  completed
                      form to EquiServe  with an initial  investment of at least
                      $250,  but not more than  $150,000.  The payment can be in
                      the  form of a check  or  money  order,  made  payable  to
                      "EquiServe - KeySpan." PLEASE DO NOT SEND CASH.

                      You may also  authorize  automatic  deductions  of $25 per
                      transaction  from a checking or savings  account at a U.S.
                      bank  or   financial   institution   either   monthly   or
                      semi-monthly,  in order to reach the minimum investment of
                      $250.  Automatic  deductions will continue until such time
                      as the new investor notifies  EquiServe in writing to stop
                      making  automatic   deductions.   An  Automatic  Deduction
                      Authorization  Form is included on the reverse side of the
                      Initial Investment Form.

                o     IF YOU ARE A REGISTERED SHAREHOLDER.  If you own shares of
                      Common  Stock that are  registered  in your name,  not the
                      name  of a  broker,  you  can  enroll  in the  Program  by
                      completing and returning an Enrollment  Authorization Form
                      to   EquiServe  or  by  calling   EquiServe   directly  at
                      1-800-482-3638.   You  may  obtain  additional  Enrollment
                      Authorization Forms at any time upon request to EquiServe.

                o     IF YOU  ARE A  NON-REGISTERED  SHAREHOLDER  If you are the
                      beneficial  owner of Common Stock through a bank,  broker,
                      or trustee,  you can become a  Registered  Shareholder  by
                      instructing your bank, broker, or trustee to transfer some
                      or all of your shares of Common Stock into your name.  You
                      can choose whether to receive a physical stock certificate
                      for your shares of Common Stock,  have them  registered in
                      the  Direct  registration  System in your name or  deposit
                      them  in  a  book-entry   Program  account  maintained  by
                      EquiServe.



                                        8

<PAGE>



                          o         STOCK  CERTIFICATE.  Once you  receive  your
                                    stock  certificate  in  your  name,  you can
                                    enroll in the  Program  and you may begin to
                                    use all of the services of the Program, such
                                    as the dividend  reinvestment and economical
                                    selling of shares features.

                          o         DIRECT    REGISTRATION   SYSTEM   BOOK-ENTRY
                                    SHARES.  This is an  electronic  transfer of
                                    your  shares  from your  broker's  name into
                                    your name  through  the Direct  Registration
                                    System.   Simply  instruct  your  broker  to
                                    conduct the transaction and begin to use any
                                    or all of the Program services.

                          o         DEPOSIT  SHARES WITH EQUISERVE IN BOOK-ENTRY
                                    ACCOUNT.  You  can  also  opt to  have  your
                                    shares   held   in  a   book-entry   account
                                    administered  by EquiServe.  This allows you
                                    to have the added safe-keeping feature which
                                    protects  you  against  the  loss,  theft or
                                    destruction of stock certificate loss.

                You may also  arrange  to have your  bank,  broker,  or  nominee
                participate  in the Program on your behalf.  In this case,  your
                participation  may be on terms and conditions  which differ from
                the terms and conditions set forth in this Program,  you will be
                limited to the dividend  reinvestment feature use of the Program
                only.  The terms and  conditions  set forth in the Program  will
                also be  subject  to the  terms  and  conditions  of your  bank,
                broker,  or  nominee.  EquiServe  will not have a record of your
                transactions  or your  account  since they will remain under the
                name of your bank or broker.

   8.     What are my dividend reinvestment options available under the Program?

                The  following  options are  available to you under the Program.
                However,  you must  elect one of the  following  options  on the
                Initial Investment Form or the Enrollment  Authorization Form in
                order  to  have  any  portion  of  your  dividends  paid to you,
                otherwise  they  will   automatically  be  fully  reinvested  to
                purchase additional shares of Common Stock.

                o         FULL DIVIDEND REINVESTMENT. You can opt to have all of
                          your cash  dividends on all  certificated  and Program
                          shares of Common  Stock  automatically  reinvested  to
                          purchase  additional shares of Common Stock. If you do
                          not make an election on the Initial Enrollment Form or
                          the   Enrollment    Authorization    Form   you   will
                          automatically have your dividends fully reinvested.

                o         PARTIAL  DIVIDEND  REINVESTMENT.  You  may  choose  to
                          receive your cash  dividends on a specified  number of
                          shares of Common Stock and automatically have the cash
                          dividends  on the  remainder  of your shares of Common
                          Stock  reinvested  to  purchase  additional  shares of
                          Common Stock.  If you elect to have partial  dividends
                          reinvestment, you must designate the number of Program
                          shares and/or certificated shares for which you choose
                          to receive your cash dividends in a whole number. Cash
                          dividends  are sent to you by check or, upon  request,
                          are  deposited  electronically  into  your  U.S.  bank
                          account.

            o  FULL  CASH  PAYMENT.  You may  choose  to  receive  all of your
               dividends as a cash  payment.  Cash  dividends are sent to you by
               check or, upon request,  are deposited  electronically  into your
               U.S. bank account.

                FOR MORE  INFORMATION  ON THE  ELECTRONIC  DEPOSIT OF DIVIDENDS,
                PLEASE REFER TO QUESTION 10, OR CONTACT EQUISERVE.


                                        9

<PAGE>



      9.        How do I make additional cash investments in Common Stock?

                You may make additional  cash  investments by choosing among the
following two options:

               o CHECK  INVESTMENT.  You may make additional cash investments in
               Common  Stock by sending to EquiServe a check,  money  order,  or
               bank draft for the purchase of additional shares of Common Stock.
               The check,  money  order,  or bank draft must be made  payable to
               "EquiServe - KeySpan" in U.S.  dollars and drawn on a U.S.  bank.
               If you are not in the U.S., contact your bank to verify that they
               can provide you with a check that clears  through a U.S. bank and
               can print the  dollar  amount in U.S.  funds.  Due to the  longer
               clearance period, we are unable to accept checks clearing through
               non-U.S. funds. EquiServe will not accept third party checks. All
               checks, money orders, and bank drafts should be sent to EquiServe
               at the  address  listed on the  tear-off  form  attached  to each
               Program  account  statement  you  receive,  or with your  Initial
               Enrollment Form or Enrollment Authorization Form.

               o AUTOMATIC  INVESTMENT FROM A BANK ACCOUNT. As an alternative to
               sending checks, money orders, and bank drafts for additional cash
               investments,  you may elect to have funds automatically withdrawn
               from your checking or savings account at a U.S. bank or financial
               institution.  You may elect  the  automatic  deduction  option by
               completing and signing an Automatic Deductions Authorization Form
               and  returning  this form to  EquiServe,  together  with a voided
               blank check or savings  account deposit slip for the bank account
               from which the funds are to be  withdrawn.  Additional  Automatic
               Deductions  Authorization  Forms are available through EquiServe.
               Your Automatic  Deductions  Authorization  Form will be processed
               and will become  effective as promptly as  practicable.  However,
               you should allow four to six weeks for the first investment to be
               initiated using this automatic deduction feature.  Once automatic
               deductions begin,  funds will be withdrawn from your bank account
               on either the first or fifteenth  day of each month,  or both (at
               your option), or on the next business day if either of those days
               is not a business  day. You may change or  discontinue  automatic
               deductions  by  completing  and  submitting  to  EquiServe  a new
               Automatic Deductions Authorization Form.

          Brokers or bank  nominees  participating  on behalf of  Non-Registered
          Shareholders   or   beneficial   owners  may  only  use  the  dividend
          reinvestment feature of the Program and cannot use the additional cash
          investment  feature.   If  a  Non-Registered   Shareholder  wishes  to
          participate in the additional cash investment  feature of the Program,
          he or she  must  first  become  a  Registered  Shareholder  or make an
          initial investment to enroll directly in the Program.

      10.       Can my cash dividends be deposited directly to my bank account?

                Yes,  you may  elect to have any cash  dividends  which  are not
                reinvested  paid by electronic  funds transfer to your U.S. bank
                account. To do this, you must first complete and return a Direct
                Deposit  Authorization  Form to EquiServe along with a copy of a
                voided blank check or savings account deposit slip. This form is
                not   included   with  your  Program   materials   and  must  be
                specifically  requested  from  EquiServe  or obtained  online at
                www.equiserve.com.

      11.       What are the minimum and maximum amounts for additional cash
                investments?

                In addition to increasing  your holdings of Common Stock through
                the  reinvestment  of dividends,  you may make  additional  cash
                investments in Common Stock at any time. Your additional cash


                                       10

<PAGE>



                investments by check, money order, or automatic  deductions must
                be at least $25 with a maximum allowable  investment of $150,000
                per calendar year. If you are not a Registered  Shareholder  and
                are  a  first  time  investor  in  the  Program,   your  initial
                investment must be for at least $250 and cannot exceed $150,000.
                SEE QUESTION 7 REGARDING NEW INVESTORS.


      COMMON STOCK PURCHASES

      12.      What are the sources of Common Stock purchased under the Program?

                Shares  of Common  Stock  will be  purchased  either on the open
                market,  or  directly  from  KeySpan,  from  shares  held in our
                treasury or as newly  issued  shares,  or a  combination  of the
                foregoing. You cannot choose the source of your shares purchased
                since this is entirely at our discretion.

                Shares  purchased  on the open  market  may be made on any stock
                exchange  where our  Common  Stock is  traded  or by  negotiated
                transactions  on terms that EquiServe may reasonably  determine.
                Neither KeySpan nor any  participant  will have any authority or
                power to direct  the  date,  time,  or price at which  shares of
                Common Stock may be  purchased,  or the selection of a broker or
                dealer through or from whom purchases are made.

      13.       When will shares be purchased under the Program?

                o         GENERAL.  Direct  purchases from KeySpan's  authorized
                          but unissued  shares of Common Stock will  normally be
                          made on a  weekly  basis on the  relevant  "investment
                          date," (usually  Thursdays) or the next trading day if
                          the investment date is not a trading day. Purchases on
                          the open market will begin on the investment  date and
                          will be  completed  no later  than 30 days  from  such
                          date,  except  where  completion  at a  later  date is
                          necessary or advisable  under any  applicable  federal
                          securities law.

                o         CASH  INVESTMENTS.  EquiServe will normally invest any
                          initial  and  additional  cash   investments  for  the
                          purchase of Common Stock on a weekly basis, usually on
                          Thursdays,  after  receipt of the check,  money order,
                          bank  draft or  automatic  deduction.  EquiServe  will
                          determine the actual  investment  date for initial and
                          additional cash investments.

                o   DIVIDEND  REINVESTMENTS.  The investment date for dividend
                    reinvestments  will be the dividend payment date or the next
                    business day if the dividend  payment date is not a business
                    day. If EquiServe  receives  your  Enrollment  Authorization
                    Form  requesting  reinvestment of dividends on or before the
                    record  date   established   for  a   particular   dividend,
                    reinvestment will commence with that dividend.  If EquiServe
                    receives  your  Enrollment   Authorization  Form  requesting
                    reinvestment of dividends after the record date  established
                    for a particular dividend,  you will be paid the dividend in
                    cash and your  reinvestment  of dividends  will begin on the
                    next dividend payment date.

                          The  anticipated  payment  dates for Common  Stock are
                          usually on the first  business day of  February,  May,
                          August,  and  November.  The  record  dates for Common
                          Stock are usually the week of the 10th of the previous
                          month of the  payment  date.  It is  anticipated  that
                          record dates and payment dates for dividends,  that we
                          may  declare in the future,  will be at  approximately
                          the same times of the year.



                                       11

<PAGE>



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

                The  purchase  price of Common  Stock  purchased  directly  from
                KeySpan,  as treasury  shares or original issue shares,  will be
                the  average of the high and low  prices of the Common  Stock as
                reported in the New York Stock Exchange  composite  transactions
                for that investment date.

                The purchase price of Common Stock  purchased on the open market
                is the  weighted  average  of the actual  purchase  price of all
                shares purchased during the applicable  investment  period.  The
                price is adjusted to include brokerage  commissions of $0.05 per
                share.  Open market  purchases  are  expected to be made through
                EquiServe.

                A  Program  participant  will  have the  applicable  commissions
                deducted from the funds used to purchase  shares  acquired under
                the Program, SEE QUESTION 25.

      15.       How many shares of Common Stock will be purchased for me?

                The  number  of  shares  purchased  for you will be equal to the
                amount of your additional cash  investments,  plus any dividends
                available for reinvestment,  or the initial investment  received
                by EquiServe during the investment  period,  less any applicable
                fees, divided by the purchase price of the shares.  Your Program
                account  will be  credited  with the  number of shares of Common
                Stock,  including  fractional  shares  computed to three decimal
                places..

      16.       Will I be paid interest on any amounts pending the actual
                investment date?

               No.  Interest  will not be paid on amounts sent to EquiServe  for
               investment pending the actual investment date.


      STOCK CERTIFICATES AND SAFE KEEPING

      17.       Will I be issued stock certificates for shares of Common Stock
                purchased through the Program?

                No.  Shares of Common Stock  purchased  through the Program will
                not be  issued  to you in stock  certificate  form,  but will be
                credited  to your  Program  account - as book entry  shares - by
                EquiServe on your  behalf.  The number of shares of Common Stock
                credited to your  Program  account will be shown on your Program
                account statement.

      18.       How may I receive a stock certificate?

                You may obtain a stock certificate at no cost for some or all of
                the whole shares credited to your Program account at any time by
                simply requesting EquiServe to withdraw shares from your Program
                account  and to issue them in stock  certificate  form.  You may
                make such a request by:

                o         Calling EquiServe at 1-800-482-3638;
                o         Accessing your Program account through the Internet at
                          EquiServe's website www.equiserve.com;
                                              -----------------
                o Using  the  tear-off  form  attached  to the  Program  account
                statement;  or
                o Sending written notice specifying the number of
                whole shares to be withdrawn.



                                       12

<PAGE>



                Stock  certificates will be issued to you and registered in your
                name.  Stock  certificates  are normally  issued to participants
                within two business  days after  receipt of a request.  No stock
                certificates  will be issued  for a  fractional  share of Common
                Stock.  If you  request  a  stock  certificate  for  all  shares
                credited to your Program  account,  a stock  certificate will be
                issued for the whole  shares and a cash payment will be made for
                any remaining fractional shares. That cash payment will be based
                upon the then-current market price of the Common Stock, less any
                service fee, any applicable brokerage commission,  and any other
                costs of sale.

                Withdrawing   shares  from  your  Program   account  into  stock
                certificate  form does not  affect  your  dividend  reinvestment
                option.  For  example,  if  you  authorized  the  full  dividend
                reinvestment  option,  cash  dividends  with  respect  to shares
                withdrawn  from you Program  account in stock  certificate  form
                will continue to be reinvested.

     19.       May I add my shares of Common Stock held in stock certificate
               form  to  my  Program  account  with  EquiServe  for  safekeeping
               purposes?

                Yes,  you may  deposit  any  Common  Stock  certificate  in your
                possession and registered in your name with EquiServe for credit
                to your Program account as book-entry  shares at any time, at no
                cost.  We will pay all fees for this service.  This  safekeeping
                feature offers two advantages:

                o         The risk associated  with loss,  theft, or destruction
                          of stock certificates is eliminated; otherwise, in the
                          case of a lost or stolen stock certificate, no sale or
                          transfer  may occur until a  replacement  is obtained,
                          which can be a costly and time-consuming process; and

                o         Since shares  deposited into your Program account with
                          EquiServe  are  treated  in the same  manner as shares
                          purchased through the Program, they may be transferred
                          or  sold  through  the  Program  in a  convenient  and
                          efficient manner.

                To combine  shares  held in stock  certificate  form with shares
                credited to your Program account, you must send your request and
                your stock  certificates  to EquiServe.  The stock  certificates
                should  not be  endorsed.  EquiServe  will  promptly  send you a
                statement confirming each stock certificate deposited.

                To insure against loss resulting from mailing stock certificates
                to EquiServe,  the Program provides for mail insurance,  free of
                charge,  for stock  certificates  valued up to  $25,000  current
                market value (maximum coverage) when mailed first class, using a
                brown,  pre-addressed envelope provided by EquiServe.  Envelopes
                may be  obtained by calling  EquiServe  at  1-800-482-3638.  For
                information  about  mailing  stock  certificates  which  have  a
                current  market value in excess of $25,000,  you should  contact
                EquiServe.   To  be  eligible  for  stock  certificate   mailing
                insurance,   you  must  notify   EquiServe  of  any  lost  stock
                certificate  claim within 30 calendar days of the date the stock
                certificates were mailed.

                Mail insurance covers the replacement of shares of Common Stock,
                but in no way  protects  you  against  any loss  resulting  from
                fluctuations  in the value of the shares  from the time you mail
                the stock  certificates  until the time replacement can be made.
                If you do not use a brown,  pre-addressed  envelope  provided by
                EquiServe,  you  should  send  your  stock  certificates  to the
                address listed in Question 5 by registered mail,  return receipt
                requested,  and insure for possible mail loss for 2% (minimum of
                $20) of the market value.  This represents the approximate  cost
                to you of  replacing  stock  certificates  if they  are  lost or
                stolen.


                                       13

<PAGE>




      SALE OF SHARES


      20.       How can I sell Program shares?

                To sell any  shares  that you  hold in  stock  certificate  form
                through the  Program,  the shares must first be  converted  into
                book-entry  shares and  credited to your  Program  account  with
                EquiServe.  You can  sell  any of the  shares  credited  to your
                Program  account with  EquiServe by calling  EquiServe at 1-800-
                482-3638,  accessing  your  Program  account via the Internet at
                www.equiserve.com, by writing to EquiServe, or by completing and
                submitting  the  tear-off   portion  of  your  Program   account
                statement.

      21.       How is the sale price of Program shares determined?

                EquiServe  aggregates all requests to sell shares and then sells
                the total share amount on the open market.  Upon receipt of your
                request to sell some or all of your shares,  EquiServe will make
                every  reasonable  effort to process all sales orders on the day
                the  orders  are  received.  To do  so,  you  must  ensure  that
                instructions  are received before 1:00 p.m.  (Eastern Time) on a
                business  day  during  which  EquiServe  and the New York  Stock
                Exchange are open.

                Sales  will be  made at the  then-current  market  price  of the
                Common Stock and EquiServe  will promptly mail you a check.  The
                check  will be for the net cash  proceeds  of the sale,  minus a
                service  fee of $5.00 plus  brokerage  commissions  of $0.05 per
                share.  EquiServe has full  discretion in all matters related to
                the sale,  including  the time of sale and  sales  price and the
                selection of a broker.  You cannot  specify a price or a time at
                which to sell your book-entry shares.

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


      TRANSFER OF SHARES

      22.       Can I assign or transfer all or a part of my Program shares to
                another person?

                Yes.  You may change  ownership  of all or part of your  Program
                shares  through a gift,  sale or otherwise at any time.  You may
                contact  EquiServe  at  1-800-482-3638   for  complete  transfer
                instructions  and you will be asked  to send  EquiServe  written
                transfer  instructions  to  enact  the  transfer.  Requests  for
                transfer  are  subject  to the  same  requirements  as  for  the
                transfer of stock  certificates,  including the requirement of a
                Medallion Signature Guarantee.

      23.       If Program  shares are  transferred to another  person,  will
                EquiServe issue a stock certificate to the transferee?

               No.  Transfers will be credited to an account in book entry form.
               If you so  request,  a stock  certificate  can be  issued  to the
               transferee.  You should contact the EquiServe for full details on
               how to make the transfer.

               For book entry transfers that involve the  establishment of a new
               Program account, a new Initial


                                       14

<PAGE>



                Investment Form, or written  instructions,  must be completed by
                the transferee.  The completed  Initial  Investment Form must be
                returned to EquiServe, along with written instructions signed by
                the current  participant,  indicating the number of shares to be
                transferred  to  the  transferee.   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 Program  account will be set up for
                full dividend  reinvestment  unless otherwise  instructed by the
                previous or new shareholder.


      OPTION CHANGES AND DISCONTINUATION OF REINVESTMENT

      24.       How  can  I  change  my  dividend   reinvestment  option  or
                discontinue reinvesting my dividends?

                You  may  change  dividend   reinvestment   options  by  calling
                EquiServe directly at 1-800-482-3638,  instructing  EquiServe in
                writing,  through the Internet or by  submitting  to EquiServe a
                new  election  on  an  Enrollment   Authorization  Form.  To  be
                effective for a specific  dividend,  any change must be received
                by  EquiServe  before  the record  date for that  dividend - see
                Question 13 for information regarding record dates.

                You may  discontinue  reinvestment of cash dividends at any time
                by calling or writing  EquiServe  or through  the  Internet.  If
                EquiServe   receives  your  request  to   discontinue   dividend
                reinvestment  on or  after  the  record  date  for  a  dividend,
                EquiServe  may either pay the  dividend  in cash or  reinvest it
                under the Program on the next investment date on your behalf. If
                reinvested, EquiServe may sell the shares purchased and send the
                proceeds to you,  less any service  fees  applicable,  brokerage
                commissions  and  other  costs of sale.  After  processing  your
                request to discontinue dividend  reinvestment,  any dividends on
                any shares  credited  in  book-entry  form or shares you hold in
                stock  certificate  form  will be paid  in cash by  check  or by
                electronic funds transfer.  To have dividends deposited directly
                to your U.S bank account, see Question 10.

      25.       Are there any fees charged to me as a Program participant?

                Below is a tabular summary of Program fees as they may relate to
you.


                  Transaction                   Fees/Commissions

-------------------------------------------------------------------------------
Initial Enrollment Fee                          None
-------------------------------------------------------------------------------
Additional Investment  Purchase
(by check, money order or
automatic deductions)
      -    Original Issue                       None
      -    Treasury                             None
      -    Open Market                          $0.05 per share
-------------------------------------------------------------------------------
Reinvestment of Dividends Fee
      -    Original Issue                       None
      -    Treasury                             None
      -    Open Market                          $0.05 per share
-------------------------------------------------------------------------------
Selling Program shares                          $5.00 + $0.05 per
                                                share
-------------------------------------------------------------------------------



                                       15

<PAGE>




-------------------------------------------------------------------------------
Issuance of Certificates                        None
-------------------------------------------------------------------------------
Deposit of Certificates                         None
-------------------------------------------------------------------------------
Transfers of Shares                             None
-------------------------------------------------------------------------------
Returned checks or failed                       $20.00
automatic deductions
-------------------------------------------------------------------------------
Duplicate statements                            $5 per year
(2 years or older).                             (not to exceed
                                                $25.00)
-------------------------------------------------------------------------------


      REPORTS TO PARTICIPANTS

      26.       What kind of reports will I be sent?

                To assist you in your record  keeping,  EquiServe  will send you
the following information:

                -     For  each  initial  cash   investment,   additional   cash
                      purchase,  sale or transfer  that you make or  receive,  a
                      statement detailing the transaction;

                -     For each dividend  reinvested,  a statement  detailing all
                      activity in your Program account for that quarter;

                -     For any  transactions  you make after the  fourth  quarter
                      dividend,  an updated cumulative  statement  detailing all
                      activity in your Program account for that year;

                -     You will also be sent copies of the communications sent to
                      other   shareholders.   These  include   KeySpan's  annual
                      reports,  notices of annual meeting and proxy  statements,
                      company updates,  and income tax information for reporting
                      dividends  paid and  proceeds  from  the  sale of  Program
                      shares.  However,  if  you  are  a  beneficial  owner  who
                      participates  through a broker or bank nominee, you should
                      contact  your  broker  or  bank  nominee  for a  statement
                      detailing reinvestment activity.


      FEDERAL INCOME TAXES

     27.            What are some of the tax  consequences of  participation
                    in the Program?

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

                If you sell shares of Common Stock under the Program,  this will
                give rise to  capital  gains or losses,  provided  you hold such
                shares as a capital  asset.  The amount of any such gain or loss
                will be the difference  between the proceeds you receive (net of
                commissions  and  fees)  and your tax  basis.  The tax  basis of
                shares  acquired  through the  Program is equal to the  purchase
                price of such shares (including brokerage  commissions and fees,
                if any).  See the  answer to  Question  14 for how the  purchase
                price is determined.



                                       16

<PAGE>



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

      OTHER INFORMATION

      28.           What  happens  if  KeySpan  issues  a  stock  dividend,
                    declares a stock split or has a rights offering?

                All stock dividends or split shares  distributed by us on shares
                credited to your Program account and/or on shares held by you in
                the form of stock  certificates  will be credited  directly into
                your Program  account.  You will receive a statement  indicating
                the  number  of shares  or  dividends  earned as a result of the
                transactions. This includes entitlements on shares calculated on
                book-entry  shares and  certificated  shares  registered in your
                name.  In the case of a rights  offering,  your  rights  will be
                based on the full shares credited to your Program account and/or
                on shares held by you in the form of stock certificates.

      29.       How will my shares be voted?

                For any meeting of Common Stock  shareholders,  all participants
                will receive proxy materials including a proxy card representing
                both the shares for which you hold  stock  certificates  and the
                whole shares credited to your Program  account.  All shares will
                be voted as  designated  by you or may be  voted  in  person  at
                shareholder meetings.

      30.       What are the  responsibilities  of KeySpan and EquiServe
                under the Program?

                In administering the Program,  KeySpan and EquiServe will not be
                liable for any of the following acts done in good faith:

                -     Any  claim of  liability  with  respect  to the  shares of
                      Common Stock of a deceased  participant's  Program account
                      prior to receipt in writing of  instructions  relating  to
                      the disposition of such shares;

                -     With respect to the prices at which shares of Common Stock
                      are  purchased  or  sold  for  the  participant's  Program
                      account  and the times  when such  purchases  or sales are
                      made;

                -     With respect to any fluctuation in the market value before
                      or after any purchase or sale of shares of Common Stock.

                Holding  Common  Stock  under the Program is no  different  than
                holding shares on your own. Neither KeySpan nor EquiServe assure
                you of a profit or protect you from any losses  sustained on the
                purchase of Common Stock under the Program.

      31.       May the Program be changed or discontinued?



                                       17

<PAGE>



                We reserve the right to amend,  suspend,  discontinue  or modify
                the Program at any time  without the  approval of  participants.
                Notice of our  determination  to suspend,  discontinue or modify
                the Program will be given to all Program participants as soon as
                practicable  after  such   determination  is  made.  Changes  or
                discontinuation  will not affect your rights as a shareholder in
                any way and any  book-entry  shares you own will  continue to be
                credited to your Program account unless you specifically request
                otherwise.

      32.       Where can I find more information on KeySpan?

                We file annual,  quarterly and special reports, proxy statements
                and other information with the SEC. You may read and copy any of
                these   documents  at  the  SEC's  public   reference  rooms  in
                Washington, D.C., Chicago and New York.

       WASHINGTON, D.C.           CHICAGO, ILLINOIS         NEW YORK
       Judiciary Plaza            SEC Regional Office       SEC Regional Office
       450 Fifth Street, N.W.     500 West Madison Street   7 World Trade Center
       Washington, D.C. 20549     Chicago, IL 60661         New York, NY 10048

                 Please call the SEC at 1-800-SEC-0330  for further  information
                 on the  public  reference  rooms.  Our  SEC  filings  are  also
                 available   to  the   public   on  the   SEC's   web   site  at
                 http://www.sec.gov.   KeySpan  is  subject  to  the   reporting
                 requirements  of the  Securities  Act of 1934. In accordance to
                 this Act, the Company files reports and other  information with
                 the SEC.

                 You may also request copies of our 10K, 10Q, annual reports and
                 proxy statements directly from KeySpan by:

             MAIL:                      TELEPHONE:         INTERNET:
             KeySpan Corporation        718-403-3196      www.keyspanenergy.com
                                                          ---------------------
             Investor Relations                     (Investor Relations Section)
             One MetroTech Center,
             22nd Floor
             Brooklyn, NY 11201




                                       18

<PAGE>




                                 USE OF PROCEEDS

           The Program provides for, and we currently contemplate,  the issuance
of Common  Stock  directly  from the  Company  either  from  shares  held in the
Company's  treasury or as newly issued shares. The Program 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 Program or the prices at which such shares
will be sold. Should Program 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 Program  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.

                              PLAN OF DISTRIBUTION

           The  shares of Common  Stock  will be  offered  directly  to  Program
participants without underwriters as described in this prospectus.

                                 LEGAL OPINIONS

     The validity of the common stock offered by us in this  prospectus  will be
passed upon for us by Steven L.  Zelkowitz,  Senior Vice  President  and General
Counsel of KeySpan Energy.  Mr.  Zelkowitz is the beneficial owner of or has the
option to acquire approximately 277,500 shares of our common stock.

                                     EXPERTS

           Arthur Andersen LLP, independent  accountants,  audited the financial
statements  for the nine months ended  December  31, 1998 and the twelve  months
ended December 31, 1999, and related schedules incorporated by reference in this
prospectus.  These documents are  incorporated  by reference  herein in reliance
upon the authority of Arthur Andersen LLP, as experts in accounting and auditing
in giving the reports.

           Ernst & Young LLP,  independent  auditors,  have  audited  the income
statement  and  statement  of cash flows,  and the related  financial  statement
schedule of Long Island  Lighting  Company for the twelve months ended March 31,
1998  included in our Annual  Report on Form 10-K,  as  amended,  for the twelve
months  ended  December  31,  1999,  as set  forth  in  their  report,  which is
incorporated by reference in this  prospectus.  These  financial  statements and
schedule are  incorporated  by reference  herein in reliance  upon Ernst & Young
LLP's report, given upon their authority as experts in accounting and auditing.




                                       19

<PAGE>




                     INCORPORATION OF DOCUMENTS BY REFERENCE

           We file annual,  quarterly and special reports,  proxy statements and
other  information with the SEC. You may read and copy any of these documents at
the SEC's public  reference  rooms in  Washington,  D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public  reference rooms. Our SEC filings are also available to the public
on the SEC's web site at http://www.sec.gov.

           We filed a registration  statement on Form S-3, as amended,  with the
SEC  covering the common  stock.  For further  information  on us and the common
stock,  you should  refer to the  registration  statement,  as amended,  and its
exhibits.  Because the prospectus may not contain all the  information  that you
may find important,  you should review the full text of these documents. We have
included copies of these documents in an exhibit to our registration  statement,
as amended, of which this prospectus is a part.

           The SEC allows us to "incorporate by reference" the information  that
we file with the SEC, which means that we can disclose important  information to
you by  referring  you to  those  documents.  The  information  incorporated  by
reference is considered  to be part of this  prospectus,  and later  information
that the we file  with the SEC will  automatically  update  and  supersede  this
information.  We  incorporate  by reference the  documents  listed below and any
future filings made with the SEC under Sections  13(a),  13(c),  14, or 15(d) of
the Securities Exchange Act of 1934 until all of the securities are sold.

          - Our Annual  Report on Form 10-K for the fiscal  year ended  December
          31, 1999;

          - Our Quarterly  Report on Form 10-Q for the  quarterly  periods ended
          March 31, 2000, June 30, 2000 and September 30, 2000;

          - Our Current  Reports on Form 8-K dated March 30,1999 (which contains
          the Right Agreement between the Company and the Rights Agent), January
          19, 2000, January 27, 2000, February 1, 2000, March 27, 2000, July 12,
          2000, July 26, 2000, October 6, 2000,  November 9, 2000,  November 20,
          2000 , November 21, 2000 and December 8, 2000.

          - Our Form 8-A filed May 26,  1998  pursuant  to Section  12(b) of the
          Exchange Act.  which  provides a description  of the Company's  common
          stock.

           You may  request  a copy of  these  filings,  at no  cost,  over  the
Internet  at our  web  site at  http://www.keyspanenergy.com  or by  writing  or
telephoning us at the following address:

                               Investor Relations
                               KeySpan Corporation
                              One MetroTech Center
                            Brooklyn, New York, 11201
                                 (718) 403-3196

           You should rely only on the information  incorporated by reference or
provided in this  prospectus or any  supplement.  We have not authorized  anyone
else to provide you with different information.


                                       20

<PAGE>




           We also 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,  KeySpan  Corporation,  One MetroTech Center, 22nd Floor,
Brooklyn, New York 11201


                                       21

<PAGE>



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

<TABLE>
<CAPTION>
Item 14.  Other Expenses of Issuance and Distribution.
<S>                                                                                        <C>
SEC Registration Fee.........................................................................$51,625
Listing Fee -- New York Stock Exchange.......................................................$25,650
Accounting Fees..............................................................................$20,000
Legal Services and Disbursements.............................................................$15,000
Printing Expenses...........................................................................$125,000
Service Charge, including postage--Transfer Agents fees.....................................$675,000
Miscellaneous Expenses.......................................................................$50,000
Total Expenses..............................................................................$962,275
</TABLE>

Item 15. Indemnification of Directors and Officers.

           The New York Business  Corporation  Law ("BCL"),  Article 7, Sections
721-726 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  the  director  personally  gained a
financial profit or other advantage to which he or she was not legally entitled.

           Section 722 of the BCL 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 or she  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 of the BCL 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

                                      II-1












<PAGE>



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  registrant  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.  The
certificate of incorporation of the registrant contains  provisions  eliminating
the personal liability of directors to the extent permitted by New York law.

           The registrant's certificate of incorporation provides generally that
it 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 or criminal by
reason of the fact that such person is or was an officer or director against all
expense,  liability and loss (including, but not limited to all attorneys' fees,
judgments, fines, pension plan taxes or penalties and amounts paid or to be paid
in  settlement)  reasonably  incurred or  suffered by such person in  connection
therewith. The 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.

(a) 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, individually or in the aggregate,
      represent  a  fundamental  change  in the  information  set  forth  in the
      registration  statement.  Notwithstanding  the foregoing,  any increase or
      decrease in volume of  securities  offered (if the total  dollar  value of
      securities

                                      II-2












<PAGE>



      offered would not exceed that which was registered) and any deviation from
      the  low or  high  end of the  estimated  maximum  offering  range  may be
      reflected in the form of prospectus filed with the Commission  pursuant to
      Rule  424(b)  if,  in the  aggregate,  the  changes  in  volume  and price
      represent  no more than a 20%  change in the  maximum  aggregate  offering
      price set forth in the  "Calculation  of  Registration  Fee"  table in the
      effective 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 (a)(1)(i) and (a)(1)(ii) do not apply
      if the  Registration  Statement is on Form S-3,  Form S-8, or Form F-3 and
      the information  required to be included in a post-effective  amendment by
      those  paragraphs is contained in periodic reports filed with or furnished
      to the  Securities  and  Exchange  Commission  by the Issuer  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 such 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.

      (b) The undersigned  registrant  hereby  undertakes  that, for purposes of
determining  any liability  under the Securities Act of 1933, each filing of the
Issuer's  annual  report  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.

      (c)  Insofar  as  indemnification   for  liabilities   arising  under  the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of such registrant  pursuant to the provisions referred to in Item 15 of
this registration statement, or otherwise,  the registrant has been advised that
in the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in such Act and is, therefore, unenforceable.
In the event that a claim for  indemnification  against such liabilities  (other
than the payment by such registrants of expenses incurred or paid by a director,
officer or controlling  person of such registrants 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,  the
registrant  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  Securities  Act of 1933 and  will be  governed  by the  final
adjudication of such issue.


                                      II-3












<PAGE>



                                   SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, KeySpan  Corporation
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  amendment  to be signed on its behalf by the  undersigned,  thereunto
duly authorized,  in the City of Brooklyn, State of New York, on the 12th day of
December, 2000.

KEYSPAN CORPORATION
Issuer of Securities
(Registrant)

By:/s/ Gerald Luterman
   -------------------------------------------
Gerald Luterman
Chief Financial Officer and Senior Vice-President
(Principal Financial Officer)

Pursuant to the  requirements of the Securities Act of 1933,  this  registration
statement has been signed below by the following  persons in the  capacities and
on the dates indicated.


Signatures and Titles:                                      Date:
                                *                           December 12, 2000
--------------------------------------------
Robert B. Catell
Chief Executive Officer and Director
(Principal Executive Officer)

/s/ Gerald Luterman                                         December 12, 2000
--------------------------------------------
Gerald Luterman
Chief Financial Officer and Senior Vice-
President
(Principal Financial Officer)

/s/ Ronald Jendras                                          December 12, 2000
---------------------------------------------


                                      II-4












<PAGE>




Ronald Jendras
Vice President, Controller and Chief
Accounting Officer
(Principal Accounting Officer)


                     *                                    December 12, 2000
--------------------------------------
Lilyan H. Affinito
Director

                     *                                    December 12, 2000
--------------------------------------
George Bugliarello
Director

                     *                                    December 12, 2000
--------------------------------------
Howard R. Curd
Director

                     *                                    December 12, 2000
--------------------------------------
Richard N. Daniel
Director

                     *                                    December 12, 2000
--------------------------------------
Donald H. Elliott
Director

                     *                                    December 12, 2000
--------------------------------------


                                      II-5












<PAGE>




Alan H. Fishman
Director

                   *                                       December 12, 2000
-----------------------------------------
James R. Jones
Director

                   *                                       December 12, 2000
-----------------------------------------
Stephen W. McKessy
Director

                   *                                       December 12, 2000
-----------------------------------------
Edward D. Miller
Director

                   *                                       December 12, 2000
-----------------------------------------
Basil A. Paterson
Director

                   *                                       December 12, 2000
-----------------------------------------
James Q. Riordan
Director

                   *                                       December 12, 2000
-----------------------------------------
Vincent Tese
Director

/s/ Ronald Jendras                                         December 12, 2000
-----------------------------------------


                                      II-6












<PAGE>




Ronald Jendras, as Attorney-in-Fact
Vice President, Controller and Chief
Accounting Officer


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

* Such  signature has been affixed  pursuant to a power of attorney  filed as an
exhibit hereto.





                                      II-7












<PAGE>



                                  EXHIBIT INDEX



   Exhibit Number          DESCRIPTION OF EXHIBITS
   --------------          -----------------------

        5*          OPINION OF STEVEN L.  ZELKOWITZ AS TO THE LEGALITY OF THE
                    COMMON STOCK TO BE ISSUED

        23-A*       CONSENT  OF  ARTHUR   ANDERSEN,   LLP,   INDEPENDENT
                    ACCOUNTANTS

        23-B*       CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

        23-C*       CONSENT  OF STEVEN  L.  ZELKOWITZ  (CONTAINED  IN HIS
                    OPINION FILED AS EXHIBIT 5 HERETO)

        24-A*       POWERS OF ATTORNEY

        24-B*       CERTIFIED  RESOLUTION  OF THE BOARD OF  DIRECTORS  OF
                    KEYSPAN ENERGY AUTHORIZING  SIGNATURES  PURSUANT TO POWER OF
                    ATTORNEY

-----------------
* FILED HEREWITH.





                                      II-8











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