As Filed with the Securities and Exchange Commission on May 17, 2001

                                                      Registration No. 333-60294

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3
                                 AMENDMENT No. 1
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

 KeySpan Corporation               New York                  11-3431358
 KeySpan Trust I                   Delaware               To be applied for
 KeySpan Trust II                  Delaware               To be applied for
 KeySpan Trust III                 Delaware               To be applied for

(Exact Name of Registrant     (State or Other             (I.R.S. Employer
as Specified in its Charter)   Jurisdiction of           Identification Number)
                              Incorporation or
                                Organization)

                            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)

                                    Copy to:
                             Raymond W. Wagner, Esq.
                           Simpson Thacher & Bartlett
                              425 Lexington Avenue
                          New York, New York 10017-3954


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

         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. X
         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.

         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.


     The information in this  prospectus is not complete and may be changed.  We
     may not sell these securities  until the registration  statement filed with
     the Securities and Exchange Commission is effective. This prospectus is not
     an offer to sell these  securities and it is not soliciting an offer to buy
     these securities in any state where the offer or sale is not permitted.


                    SUBJECT TO COMPLETION, DATED MAY 17, 2001

                                   PROSPECTUS

                                     [LOGO]

                               KEYSPAN CORPORATION

                                 Debt Securities
                                 Preferred Stock
                                Depositary Shares
                                  Common Stock
                              Stock Purchase Units
                            Stock Purchase Contracts
                                    Warrants
                                  Warrant Units

                                 KEYSPAN TRUST I
                                KEYSPAN TRUST II
                                KEYSPAN TRUST III

                           Trust Preferred Securities

                 Guaranteed, to the extent set forth herein, by
                               KEYSPAN CORPORATION

         KeySpan Corporation will provide the specific terms of these securities
in supplements to this prospectus. You should read this prospectus and the
applicable prospectus supplement carefully before you invest.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                 The date of this prospectus is ________, 2001.







                                TABLE OF CONTENTS

                                                                   Page
                                                                   ----

About This Prospectus...............................................i
Risk Factors........................................................1
Forward-Looking Statements..........................................3
Keyspan Corporation.................................................4
The Trusts..........................................................4
Use of Proceeds.....................................................5
Ratio of Earnings to Fixed Charges and of Earnings to
  Combined Fixed Charges and Preferred Stock Dividends..............5
Description of Debt Securities......................................6
Description of Preferred Stock.....................................19
Description of Depositary Shares...................................22
Description of the Trust Preferred Securities......................25
Description of Common Stock........................................37
Description of Stock Purchase Contracts and Stock Purchase Units...41
Description of Warrants and Warrant Units..........................42
United States Federal Income Tax Consequences......................44
ERISA Considerations...............................................61
Plan of Distribution...............................................65
Legal Opinions.....................................................66
Experts............................................................66
Where You Can Find More Information................................67


                              About This Prospectus


         As used in this prospectus and any prospectus supplement or term sheet,
"KeySpan" generally means KeySpan Corporation, together with its consolidated
subsidiaries. However, in the descriptions of the securities offered in this
prospectus and related risk factors, "KeySpan" means KeySpan Corporation and not
any of its subsidiaries.

         You should rely only on the information incorporated by reference or
provided in this prospectus or any supplement or term sheet. KeySpan has not
authorized anyone else to provide you with different information. KeySpan is not
making an offer of these securities in any state where the offer is not
permitted. You should not assume that the information in this prospectus or any
supplement is accurate as of any date other than the date on the front of these
documents.








                                  RISK FACTORS


         In addition to the risk factors discussed below relating to trust
preferred securities, if appropriate, we will include risk factors relating to
securities offered using this prospectus in the prospectus supplement relating
to the offered securities.

Risk Factors Relating to the Trust Preferred Securities

         Your investment in the trust preferred securities will involve several
risks. You should carefully consider the following discussion of risks, and the
other information in this prospectus, before deciding whether an investment in
the trust preferred securities is suitable for you.

KeySpan  is not  required  to  pay  you  under  the  guarantee  and  the  junior
subordinated debt securities unless it first makes other required payments.

         KeySpan's obligations under the junior subordinated debt securities
will rank junior to all of its senior debt. This means that KeySpan cannot make
any payments on the junior subordinated debt securities if it defaults on a
payment of senior debt and does not cure the default within the applicable grace
period or if the senior debt becomes immediately due because of a default and
has not yet been paid in full. In addition, KeySpan's obligations under the
junior subordinated debt securities will be effectively subordinated to all of
the existing and future liabilities of its subsidiaries. KeySpan's obligations
under the guarantee are subordinated to all of its other liabilities. This means
that KeySpan cannot make any payments on the guarantee if it defaults on a
payment on any of its other liabilities. In addition, in the event of the
bankruptcy, liquidation or dissolution of KeySpan, its assets would be available
to pay obligations under the guarantee only after it has made all payments on
its other liabilities.

         Neither the trust preferred securities, the junior subordinated debt
securities nor the guarantee limit KeySpan's ability to incur additional
indebtedness, including indebtedness that ranks senior in priority of payment to
the junior subordinated debt securities and the guarantee.

KeySpan is not required to pay you under the  guarantee  if the  relevant  trust
does not have cash available.

         The ability of each trust to make payments on the trust preferred
securities is solely dependent upon KeySpan making the related payments on the
junior subordinated debt securities when due.

         If KeySpan defaults on its obligations to make payments on the junior
subordinated debt securities, the trusts will not have sufficient funds to make
payments on the trust preferred securities. In those circumstances, you will not
be able to rely upon the guarantee for payment of these amounts.

Deferral of  distributions  would have adverse tax  consequences for you and may
adversely affect the trading price of the trust preferred securities.

         If distributions on the trust preferred securities are deferred, you
will be required to recognize interest income for United States federal income
tax purposes in respect of your ratable share of the interest on the junior
subordinated debt securities held by the trust before you receive any cash
distributions relating to this interest. In addition, you will not receive this
cash if you sold the trust preferred securities before the end of any deferral
period or before the record date relating to distributions which are paid.

         KeySpan has no current intention of deferring interest payments on the
junior subordinated debt securities and believes that such deferral is a remote
possibility. However, if KeySpan exercises its right to do so in the future, the
trust preferred securities may trade at prices that do not fully reflect the
value of accrued but unpaid interest on the junior subordinated debt securities.
If you sell the trust preferred securities during an interest deferral period,
you may not receive the same return on investment as someone else who continues
to hold the trust preferred securities. In addition, the existence of KeySpan's
right to defer payments of interest on the junior subordinated debt securities
may mean that the market price for the trust preferred securities, which
represent an undivided beneficial interest in the junior subordinated debt
securities, may be more volatile than other securities that do not have these
rights.

You should not rely on the  distributions  from the trust  preferred  securities
through  their  maturity  date--they  may be redeemed  at any time if  specified
changes in tax or investment company law occur.

         If specified changes in tax or investment company law occur and other
specified conditions are satisfied, the trust preferred securities could be
redeemed by the trusts at a redemption price equal to their issue price plus any
accrued and unpaid distributions.

You should not rely on the  distributions  from the trust  preferred  securities
through their maturity date--they may be redeemed at KeySpan's option.

         The trust preferred securities may be redeemed in whole, at any time,
or in part, from time to time, at a redemption price equal to their issue price
plus any accrued and unpaid distributions. You should assume that this
redemption option will be exercised if KeySpan is able to refinance at a lower
interest rate or it is otherwise in its interest to redeem the junior
subordinated debt securities. If KeySpan redeems the junior subordinated debt
securities, the trusts must redeem the trust preferred securities in an
aggregate liquidation amount equal to the aggregate principal amount of junior
subordinated debt securities redeemed.

You may suffer a loss if junior  subordinated debt securities are distributed to
you in exchange for preferred securities because market prices for the preferred
securities and the junior subordinated debt securities may not be equal.

         KeySpan cannot give you any assurance as to the market prices for the
preferred securities or the junior subordinated debt securities that may be
distributed in exchange for preferred securities. Accordingly, the preferred
securities that an investor may purchase, whether pursuant to the offer made by
this prospectus or in the secondary market, or the junior subordinated debt
securities that a holder of preferred securities may receive in exchange for
preferred securities, may trade at a discount to the price that the investor
paid to purchase the preferred securities.

You could suffer adverse tax  consequences if KeySpan  terminates the trusts and
distributes the junior subordinated debt securities to holders.

         KeySpan has the right to terminate the trust at any time. If KeySpan
decides to exercise this right, the trust will redeem the trust preferred
securities by distributing junior subordinated debt securities to holders of the
trust preferred securities on a proportionate basis.

         Under current United States federal income tax law, a distribution of
junior subordinated debt securities to you on the dissolution of the trust
should not be a taxable event to you. However, if the trust is characterized for
United States federal income tax purposes as an association taxable as a
corporation at the time it is dissolved or if there is a change in law, the
distribution of junior subordinated debt securities to you may be a taxable
event to you.

Because  you have  limited  voting  rights,  you may not be able to prevent  the
trusts from taking actions you may not agree with.

         You will have limited voting rights. In particular, except for the
limited exceptions described below, only KeySpan can elect or remove any of the
trustees.

                           FORWARD-LOOKING STATEMENTS


         Some of the information included in this prospectus, any prospectus
supplement or term sheet and the documents KeySpan has incorporated by reference
contain forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995, as amended. Such statements relate to future
events or KeySpan's future financial performance. KeySpan uses words such as
"anticipate," "believe," "expect," "may," "project," "will" or other similar
words to identify forward-looking statements.

         Without limiting the foregoing, all statements relating to KeySpan's

        - future outlook,

        - anticipated capital expenditures,

        - future cash flows and borrowings,

        - pursuit of potential future acquisition opportunities, and

        - sources of funding

are forward-looking statements. These forward-looking statements are based on
numerous assumptions that KeySpan believes are reasonable, but they are open to
a wide range of uncertainties and business risks and actual results may differ
materially from those discussed in these statements.

         Among the factors that could cause actual results to differ materially
are:

     -    general  economic  conditions,  especially  in  the  Northeast  United
          States;

     -    available sources and costs of fuel;

     -    volatility  of energy prices in a deregulated  market  environment  as
          well as in the  source  of  natural  gas  and  fuel  used to  generate
          electricity;

     -    federal and state regulatory  initiatives  that increase  competition,
          threaten cost and investment recovery and impact rate structure;

     -    KeySpan's ability to successfully reduce its cost structures;

     -    the  successful  integration  of  KeySpan's  subsidiaries,   including
          Eastern, EnergyNorth and their subsidiaries;

     -    the degree to which KeySpan develops unregulated business ventures, as
          well as federal  and state  regulatory  policies  affecting  KeySpan's
          ability to retain and operate those business ventures;

     -    KeySpan's ability to identify and make complementary acquisitions,  as
          well as the successful integration of those acquisitions; and

     -    inflationary trends and interest rates.

         When considering these forward-looking statements, you should keep in
mind the cautionary statements in this document, any prospectus supplement or
term sheet and the documents incorporated by reference. KeySpan will not update
these statements unless the securities laws require it to do so.

                               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. KeySpan has assets of more than $11.5 billion and
approximately 2.5 million gas customers throughout the Northeast.

         KeySpan's core business is gas distribution, conducted by its 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.

         KeySpan is also a major, and growing, generator of electricity. KeySpan
owns and operates five large generating plants and 42 smaller facilities in
Nassau and Suffolk Counties on Long Island and leases and operates a major
facility in Queens County in New York City. Under contractual arrangements,
KeySpan provides power, electric transmission and distribution services
operation and maintenance, billing and other customer services for approximately
one million electric customers of the Long Island Power Authority on Long
Island.

         KeySpan's 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. KeySpan also invests in,
and participates in the development of, pipelines and other energy-related
projects, domestically and internationally.

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

         KeySpan's principal place of business is One Metro Tech Center,
Brooklyn, New York 11201, and its telephone number is (718) 403-1000.

                                   THE TRUSTS


         KeySpan Trust I, KeySpan Trust II and KeySpan Trust III are Delaware
business trusts. Their principal place of business is c/o KeySpan Corporation,
One Metro Tech Center, Brooklyn, New York 11201, and its telephone number is
(718) 403-1000.

         All of the common securities of the trusts will be owned by KeySpan.
KeySpan will issue a series of junior subordinated debt securities to the trust
in exchange for the trust common securities and the trust preferred securities.
KeySpan will simultaneously sell the trust preferred securities to the public.
The junior subordinated debt securities will have with the same financial terms
as the trust preferred securities.

         There are five trustees of each trust. Three of them, referred to as
regular trustees, are officers of KeySpan. The Chase Manhattan Bank will act as
the property trustee of each trust, and Chase Manhattan Bank Delaware will act
as the Delaware trustee.

                                 USE OF PROCEEDS


         Unless otherwise specified in the applicable prospectus supplement, the
net proceeds form the sale of the offered securities will be used for KeySpan's
general corporate purposes.

 RATIO OF EARNINGS TO FIXED CHARGES AND OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS


         The following table shows KeySpan's consolidated ratio of earnings to
fixed charges and earnings to combined fixed charges and preferred stock
dividends for the periods indicated.

                               Twelve Months    Twelve Months Ended March 31,      Nine Months        Year Ended December 31,
                                   Ended                                              Ended
                               December 31,                                       December 31,
                                  1996(a)        1997(a)         1998(a)              1998               1999            2000
                                  -------        -------         -------              ----               ----            ----
                                                                                                    
Ratio of Earnings to Fixed
   Charges                         2.15              2.21            2.44              (b)              3.23            3.02
Ratio of Earnings to
   Combined Fixed Charges
   and Preferred stock
   Dividends                       1.81              1.85            2.03              (b)              2.47            2.70
- ---------------------------- ------------------ --------------- --------------- ------------------ --------------- ---------------

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

     (a)  Represents ratio of earnings to fixed charges and earnings to combined
          fixed  changes  and  preferred  stock  dividends,   respectively,  for
          KeySpan's predecessor, Long Island Lighting Company.

     (b)  For  the  nine  months  ended   December  31,  1998,   earnings   were
          insufficient to cover fixed charges by $365.0 million and insufficient
          to cover combined fixed charges and preferred  stock dividends by $409
          million.  During the nine months  ended  December  31,  1998,  KeySpan
          incurred the following special charges (after tax): charges associated
          with the  transaction  with the Long Island Power  Authority of $107.9
          million;  charges  associated  with  the  combination  of Long  Island
          Lighting  Company's gas and electric services  businesses with KeySpan
          of $83.5 million;  an impairment charge of $54.1 million to write-down
          the value of proved  gas  reserves;  and a charge of $13.0  million to
          establish a not-for-profit philanthropic foundation.









                         DESCRIPTION OF DEBT SECURITIES


         The debt securities offered by this prospectus will be unsecured
obligations of KeySpan and will be either senior or subordinated debt. The
senior debt and the subordinated debt will be issued under an indenture that is
sometimes referred to in this prospectus as the "indenture." The indenture is
filed with the SEC as an exhibit to the registration statement of which this
prospectus forms a part.

         The following briefly summarizes the material provisions of the
indenture and the debt securities, other than pricing and related terms
disclosed in the accompanying prospectus supplement or term sheet. The
prospectus supplement will also state whether any of the terms summarized below
do not apply to the series of debt securities being offered. You should read the
more detailed provisions of the indenture, including the defined terms, for
provisions that may be important to you. You should also read the particular
terms of a series of debt securities, which will be described in more detail in
the applicable prospectus supplement. Copies of the indenture may be obtained
from KeySpan or the applicable trustee. So that you may easily locate the more
detailed provisions, the numbers in parentheses below refer to sections in the
indenture. Wherever particular sections or defined terms of the indenture are
referred to, those sections or defined terms are incorporated into this
prospectus by reference, and the statement in this prospectus is qualified by
that reference.

         Unless otherwise provided in the applicable prospectus supplement, the
trustee under the indenture will be The Chase Manhattan Bank.

         Capitalized terms used below are defined under "Material covenants -
Defined terms."

Specific terms of each series

         Each time that KeySpan issues a new series of debt securities, the
prospectus supplement or term sheet relating to that new series will specify the
particular amount, price, whether the debt securities are senior or subordinated
debt and other terms of those debt securities. These terms may include:

     -    the title of the debt securities;

     -    any limit on the total principal amount of the debt securities;

     -    the date or dates on which the principal of the debt  securities  will
          be payable or their manner of determination;

     -    the interest rate or rates of the debt  securities;  the date or dates
          from  which  interest  will  accrue  on the debt  securities;  and the
          interest  payment  dates  and the  regular  record  dates for the debt
          securities; or, in each case, their manner of determination;

     -    the place or places where the principal of and premium and interest on
          the debt securities will be paid;

     -    the period or periods  within which,  the price or prices at which and
          the  terms on which any of the debt  securities  may be  redeemed,  in
          whole  or  in  part  at   KeySpan's   option,   and  any   remarketing
          arrangements;

     -    the terms on which  KeySpan  would be  required  to  redeem,  repay or
          purchase  debt  securities  required  by any sinking  fund,  mandatory
          redemption  or similar  provision;  and the  period or periods  within
          which,  the price or prices at which and the terms and  conditions  on
          which the debt securities will be so redeemed,  repaid or purchased in
          whole or in part;

     -    the denomination in which the debt securities will be issued, if other
          than denominations of $1,000 and any whole multiple thereof;

     -    the portion of the  principal  amount of the debt  securities  that is
          payable on the declaration of  acceleration of the maturity,  if other
          than their  principal  amount;  these debt  securities  could  include
          original  issue  discount,  or OID,  debt  securities  or indexed debt
          securities, which are each described below;

     -    whether  and under  what  circumstances  KeySpan  will pay  additional
          amounts under any debt  securities  held by a person who is not a U.S.
          person for tax payments, assessments or other governmental charges and
          whether KeySpan has the option to redeem the debt securities which are
          affected by the  additional  amounts  instead of paying the additional
          amounts;

     -    the form in which  KeySpan  will  issue the debt  securities,  whether
          registered,  bearer or both, and any  restrictions  on the exchange of
          one form of debt  securities  for another  and on the offer,  sale and
          delivery of the debt securities in either form;

     -    whether the debt securities will be issuable as global securities;

     -    whether the amounts of payments of principal of, premium,  if any, and
          interest,  if any, on the debt  securities  are to be determined  with
          reference to an index,  formula or other method, and if so, the manner
          in which such amounts will be determined;

     -    if the debt  securities  are  issuable  in  definitive  form  upon the
          satisfaction  of  certain  conditions,  the  form  and  terms  of such
          conditions;

     -    any trustees, paying agents, transfer agents, registrars, depositories
          or similar agents with respect to the debt securities;

     -    any  additions or deletions to the terms of the debt  securities  with
          respect  to the  events of default  or  covenants  governing  the debt
          securities;

     -    the foreign  currency or units of two or more  foreign  currencies  in
          which payment of the principal of and premium and interest on any debt
          securities will be made, if other than U.S. dollars,  and the holders'
          right,  if any,  to elect  payment  in a foreign  currency  or foreign
          currency  unit  other  than  that in  which  the debt  securities  are
          payable;

     -    whether  and to  what  extent  the  debt  securities  are  subject  to
          defeasance on terms different from those  described under  "Defeasance
          of the indenture;" and

     -    any other terms of the debt securities that are not inconsistent  with
          the indenture.

         KeySpan may issue debt securities as OID debt securities. OID debt
securities bear no interest or bear interest at below-market rates and are sold
at a discount below their stated principal amount. If KeySpan issues OID debt
securities, the prospectus supplement or term sheet will contain the issue
price, the rate at which interest will accrete, and the date from which such
interest will accrete on the OID debt securities.

         KeySpan may also issue indexed debt securities. Payments of principal
of, and premium and interest on, indexed debt securities are determined with
reference to the rate of exchange between the currency or currency unit in which
the debt security is denominated and any other currency or currency unit
specified by KeySpan, to the relationship between two or more currencies or
currency units or by other similar methods or formulas specified in the
prospectus supplement or term sheet.

         The terms on which a series of debt securities may be convertible into
or exchangeable for other securities of KeySpan or another party will be set
forth in the prospectus supplement relating to that series. The terms will
include provisions as to whether conversion or exchange is mandatory, at the
option of the holder or at KeySpan's option. The terms may include provisions
under which the number of other securities to be received by the holders of a
series of debt securities may be adjusted. (section 301)

Senior debt

         The senior debt securities will rank on an equal basis with all of
KeySpan's other unsecured debt.

Subordinated debt

         The subordinated debt securities will rank subordinated and junior in
right of payment, to the extent set forth in the indenture, to all of KeySpan's
"senior debt" (as defined below).

         If KeySpan defaults in the payment of any principal of, or premium, if
any, or interest on any senior debt when it becomes due and payable after any
applicable grace period, then, unless and until the default is cured or waived
or ceases to exist, KeySpan cannot make a payment on account of or redeem or
otherwise acquire the subordinated debt securities.

         If there is any insolvency, bankruptcy, liquidation or other similar
proceeding relating to KeySpan or KeySpan's property, then all senior debt must
be paid in full before any payment may be made to any holders of subordinated
debt securities.

         Furthermore, if KeySpan defaults in the payment of the principal of and
accrued interest on any subordinated debt securities that is declared due and
payable upon an event of default under the subordinated debt indenture, holders
of all senior debt will first be entitled to receive payment in full in cash
before holders of subordinated debt securities can receive any payments.

         "Senior debt" means:

     (a)  the  principal,  premium,  if any,  and  interest  in  respect  of (A)
          KeySpan's   indebtedness  for  money  borrowed  and  (B)  indebtedness
          evidenced by  securities,  notes,  debentures,  bonds or other similar
          instruments issued by KeySpan, including the senior debt securities;

     (b)  all of KeySpan's capitalized lease obligations;

     (c)  all of KeySpan's obligations  representing the deferred purchase price
          of property; and

     (d)  all  deferrals,  renewals,  extensions and refunding of obligations of
          the type referred to in clauses (a) through (c);

but senior debt does not include:

     1.   subordinated debt securities;

     2.   any indebtedness  that by its terms is subordinated to, or ranks on an
          equal basis with, subordinated debt securities;

     3.   indebtedness  for goods or materials  purchased in the ordinary course
          of  business  or for  services  obtained  in the  ordinary  course  of
          business or indebtedness consisting of trade payables; and

     4.   indebtedness  that is  subordinated to an obligation of KeySpan of the
          type specified in clauses (a) through (d) above. (section 1401)

Form and denomination

         The prospectus supplement or term sheet will describe the form which
the debt securities will have, including insertions, omissions, substitutions
and other variations permitted by the indenture and any legends required by any
laws, rules or regulations. (section 201)

         KeySpan will issue debt securities in denominations of $1,000 and whole
multiples thereof, unless the prospectus supplement or term sheet states
otherwise. (section 302)

Payment

         KeySpan will pay principal of and premium and interest on its
registered debt securities at the place and time described in the debt
securities. KeySpan will pay installments of interest on any registered debt
security to the person in whose name the registered debt security is registered
at the close of business on the regular record date for these payments. KeySpan
will pay principal and premium on registered debt securities only against
surrender of these debt securities. (section 1001) If KeySpan issues debt
securities in bearer form, the prospectus supplement or term sheet will describe
where and how payment will be made.

Material covenants

         The indenture includes the following material covenants:

      Lien on assets

         If KeySpan or any of its Gas Utility Subsidiaries mortgages, pledges or
otherwise subjects to any lien the whole or any part of any Property which they
now own or acquire in the future, then KeySpan or that Gas Utility Subsidiary
will secure the debt securities to the same extent and in the same proportion as
the debt or other obligation that is secured by each of those mortgages, pledges
or other liens. The debt securities will remain secured for the same period as
the other debt remains secured. This restriction does not apply, however, to any
of the following:

     -    purchase-money mortgages or liens;

     -    liens on any  property or asset that  existed at the time when KeySpan
          or that Gas Utility Subsidiary acquired that property or asset;

     -    any deposit or pledge to secure  public or  statutory  obligations  or
          contractual obligations to Long Island Power Authority;

     -    any deposit or pledge with any  governmental  agency required in order
          to  qualify  KeySpan or that Gas  Utility  Subsidiary  to conduct  its
          business,  or any part of its  business,  or to entitle it to maintain
          self-insurance  or to  obtain  the  benefits  of any law  relating  to
          workmen's compensation,  unemployment  insurance,  old age pensions or
          other social security;

     -    any  deposit  or  pledge  with  any  court,   board,   commission   or
          governmental  agency as security  related to the proper conduct of any
          proceeding before it;

     -    any mortgage, pledge or lien on any property or asset of any affiliate
          of KeySpan other than Gas Utility Subsidiaries,  even if the affiliate
          may have acquired that property or asset from KeySpan or a Gas Utility
          Subsidiary;

     -    any lien  granted over  receivables  or other  monetary or  regulatory
          assets granted in connection  with a  securitization  arrangement  for
          those assets to secure KeySpan or one of its Gas Utility Subsidiaries'
          monetary  or  regulatory  obligations  incurred  in  relation  to such
          securitization arrangements,  so long as the principal amount of those
          obligations  does  not  exceed  the  aggregate  face  amount  of  such
          receivables or monetary assets;

     -    liens for taxes, assessments or governmental charges or levies not yet
          delinquent or being contested in good faith by KeySpan, if appropriate
          reserves have been made;

     -    liens of landlords and liens of mechanics and materialmen  incurred in
          the  ordinary  course  of  business  for  sums  not yet  due or  being
          contested in good faith by KeySpan, if appropriate  reserves have been
          made;

     -    leases  or  subleases  granted  to others  in the  ordinary  course of
          business;

     -    easements, rights-of-way,  restrictions and other similar encumbrances
          incurred in the ordinary course of business and which do not interfere
          with the ordinary conduct of business;

     -    liens  incurred  in  connection  with  the  issuance  by a state  or a
          political  subdivision  of a state of any  securities  the interest on
          which is exempt from  federal  income  taxes under  Section 103 of the
          Internal  Revenue Code or any other laws or  regulations  in effect at
          the time of the issuance; or

     -    liens for the sole purpose of extending,  renewing or replacing all or
          a part of the  indebtedness  secured  by any lien  referred  to in the
          foregoing clauses or in this clause.

         Notwithstanding the foregoing, KeySpan and its Gas Utility Subsidiaries
may create, incur or permit to exist any lien to secure Indebtedness in addition
to those permitted by the preceding sentence, and renew, extend or replace such
liens, provided that at the time of such creation, incurrence, renewal,
extension or replacement, after giving effect thereto, the aggregate amount of
all such Indebtedness of KeySpan and the Gas Utility Subsidiaries and the
aggregate Attributable Value of all Sales and Leaseback Transactions of KeySpan
and the Gas Utility Subsidiaries at any one time outstanding together shall not
exceed 10% of Consolidated Tangible Assets. As of March 31, 2001, Consolidated
Tangible Assets were $11.4 billion. (section 1007).

      Sale and leaseback transactions

         Neither KeySpan nor any of its Gas Utility Subsidiaries may enter into
any Sale and Leaseback unless either:

     -    KeySpan and its Gas Utility Subsidiaries would be entitled pursuant to
          the "--Liens on assets" covenant to create  Indebtedness  secured by a
          lien on the Principal Property to be leased back in an amount equal to
          the Attributable Value of such Sale and Leaseback  Transaction without
          the debt  securities  being equally and ratably  secured with,  or, at
          KeySpan's option, prior to, that Indebtedness; or

     -    KeySpan or the relevant Gas Utility Subsidiary,  within 270 days after
          the sale or  transfer  of the  relevant  assets  shall have been made,
          applies,  in the case of a sale or transfer for cash,  an amount equal
          to the  net  proceeds  from  the  sale  or,  in the  case of a sale or
          transfer  otherwise  than for cash, an amount equal to the fair market
          value of the  Principal  Property so leased,  as determined by any two
          directors of KeySpan or the relevant Gas Utility Subsidiary, to:

     -    the  retirement of  Indebtedness  of KeySpan  ranking prior to or on a
          parity  with the debt  securities,  incurred  or assumed by KeySpan or
          that Gas  Utility  Subsidiary  which by its  terms  matures  at, or is
          extendible  or  renewable at the option of the obligor to, a date more
          than  twelve  months  after  the  date  of   incurring,   assuming  or
          guaranteeing such Indebtedness or

     -    the investment in any Principal  Property used in the ordinary  course
          of business. (section 1008)

      Limitation on merger, consolidation and sales of assets

         KeySpan may not consolidate with or merge into any other entity or
transfer or lease substantially all of its properties and assets to any person
unless:

     -    the  successor is organized  under the laws of the United  States or a
          state thereof;

     -    the successor assumes by supplemental indenture the obligations of its
          predecessor--  that is, all of  KeySpan's  obligations  under the debt
          securities and the indenture; and

     -    after giving effect to the transaction,  there is no default under the
          indenture.

         The surviving transferee or lessee corporation will be KeySpan's
successor, and KeySpan will be relieved of all obligations under the debt
securities and the indenture. (sections 801 and 802)

      Defined terms

         "Attributable Value" means, as to any particular lease under which
KeySpan or any of its Gas Utility Subsidiaries is at any time liable as lessee
and at any date as of which the amount thereof is to be determined, the total
net obligations of the lessee for rental payments during the remaining term of
the lease (including any period for which such lease has been extended or may,
at the option of the lessor, be extended) discounted from the respective due
dates thereof to such date at a rate per annum equivalent to the interest rate
inherent in such lease (as determined in good faith by KeySpan in accordance
with generally accepted financial practice) compounded semi-annually.

         "Capital Stock" of any Person means shares, interests, rights to
purchase, warrants, options, participation or other equivalents of or interests
in, however designed, equity of such Person, including any preferred stock, but
excluding any debt securities convertible into such equity.

         "Consolidated Tangible Assets" means, as of the date of any
determination thereof, the total of all assets which would appear on a
consolidated balance sheet of KeySpan and its subsidiaries, prepared in
accordance with U.S. generally accepted accounting principles, or U.S. GAAP, at
their net book values (after deducting related depreciation, depletion and
amortization which, in accordance with U.S. GAAP, should be set aside in
connection with the business conducted), but excluding goodwill, trade names,
trademarks, patents, unamortized debt discount and all other intangible assets
all as determined in accordance with U.S. GAAP.

         "Gas Utility Subsidiaries" means the following subsidiaries of KeySpan
engaged in the distribution and sale at retail of natural gas: The Brooklyn
Union Gas Company d/b/a KeySpan Energy Delivery New York, KeySpan Gas East
Corporation d/b/a KeySpan Energy Delivery Long Island, Boston Gas Company,
Colonial Gas Company, Essex Gas Company, and EnergyNorth Natural Gas, Inc. d/b/a
KEDNE; and any other subsidiary of KeySpan engaged in such activity, provided
such subsidiary would be, at any particular time, a Significant Subsidiary.

         "Indebtedness" means, with respect to any Person, without duplication:

          1. any liability of that Person:

               -    for  borrowed  money or under any  reimbursement  obligation
                    relating to a letter of credit or similar instrument;

               -    evidenced by a bond, note, debenture or similar instrument;

               -    to pay the deferred  purchase price of property or services,
                    except trade accounts payable arising in the ordinary course
                    of business; or

               -    for the payment of money relating to any  obligations  under
                    any  capital  lease of real or personal  property  which has
                    been recorded as a capitalized lease obligation.

          2. any liability of others  described in the preceding clause (1) that
          the Person has guaranteed or that is otherwise its legal  liability or
          which is secured by a lien on that Person's Property;

          3.  any  amendment,  supplement,   modification,   deferral,  renewal,
          extension or refunding  of any  liability of the types  referred to in
          clauses (1) or (2) above; and

          4.  in the  case  of  any of  KeySpan's  subsidiaries,  the  aggregate
          preference in respect of amounts payable on the issued and outstanding
          shares of preferred  stock of any such  subsidiary in the event of any
          voluntary  or  involuntary  liquidation,  dissolution  or winding  up,
          excluding any such preference attributable to such shares of preferred
          stock that are owned by such Person or any of its subsidiaries.

         "Person" means any individual, firm, corporation, partnership,
association, joint venture, tribunal, limited liability company, trust,
government or political subdivision or agency or instrumentality thereof, or any
other entity or organization.

         "Principal Property" means the real estate, fixtures, pipelines, mains,
meters, pipes, valves, compressors and other related personal property primarily
used in connection with the transportation, distribution or retail sale of gas
by the Gas Utility Subsidiaries.

         "Property" means any asset, revenue or any other property, including
capital stock, whether tangible or intangible, real or personal, including,
without limitation, any right to receive income.

         "Sale and Leaseback Transaction" means any transaction or series of
related transactions relating to Principal Property now owned or hereafter
acquired whereby KeySpan or one of its Gas Utility Subsidiaries transfers the
Principal Property to a Person and KeySpan or one of its Gas Utility
Subsidiaries leases it from that Person for a period, including renewals, in
excess of three years.

         "Significant Subsidiary" has the meaning specified, as of the date of
the indenture, in Rule 1-02 of Regulation S-X promulgated under the Securities
Act.

Registration of transfer and exchange

         All debt securities issued upon any registration of transfer or
exchange of debt securities will be valid obligations of KeySpan, evidencing the
same debt and entitled to the same rights under the indenture as the debt
securities surrendered in the registration of transfer or exchange.

      Registration of transfer

     Holders of registered  debt  securities  may present their  securities  for
registration  of  transfer  at the  office  of one or more  security  registrars
designated and maintained by KeySpan. (section 305)

         KeySpan will not be required to register the transfer of or exchange
debt securities under the following conditions:

          -    KeySpan  will not be  required  to  register  the  transfer of or
               exchange  any debt  securities  during a period of 15 days before
               any selection of those debt securities to be redeemed.

          -    KeySpan  will not be  required  to  register  the  transfer of or
               exchange any debt securities selected for redemption, in whole or
               in part,  except the  unredeemed  portion of any debt  securities
               being redeemed in part.

          -    KeySpan  will not be  required  to  register  the  transfer of or
               exchange  debt  securities  of any  holder who has  exercised  an
               option to require the repurchase of those debt  securities  prior
               to their  stated  maturity  date,  except the  portion  not being
               repurchased. (section 305)

      Exchange

         At your option, you may exchange your registered debt securities of any
series, except a global security, as set forth below, for an equal principal
amount of other registered debt securities of the same series having authorized
denominations upon surrender to KeySpan's designated agent.

         KeySpan may at any time exchange debt securities issued as one or more
global securities for an equal principal amount of debt securities of the same
series in definitive registered form. In this case KeySpan will deliver to the
holders new debt securities in definitive registered form in the same aggregate
principal amount as the global securities being exchanged.

         The depositary of the global securities may also decide at any time to
surrender one or more global securities in exchange for debt securities of the
same series in definitive registered form, in which case KeySpan will deliver
the new debt securities in definitive form to the persons specified by the
depositary, in an aggregate principal amount equal to, and in exchange for, each
person's beneficial interest in the global securities. (section 305)

         Notwithstanding the above, KeySpan will not be required to exchange any
debt securities if, as a result of the exchange, KeySpan would suffer adverse
consequences under any United States law or regulation.
(section 305)

Global securities

         If KeySpan decides to issue debt securities in the form of one or more
global securities, then KeySpan will register the global securities in the name
of the depositary for the global securities or the nominee of the depositary and
the global securities will be delivered by the trustee to the depositary for
credit to the accounts of the holders of beneficial interests in the debt
securities.

         The prospectus supplement or term sheet will describe the specific
terms of the depositary arrangement for debt securities of a series that are
issued in global form. None of KeySpan, the trustee, any paying agent or the
security registrar will have any responsibility or liability for any aspect of
the records relating to or payments made on account of beneficial ownership
interests in a global debt security or for maintaining, supervising or reviewing
any records relating to these beneficial ownership interests.

Defeasance of the indenture

         Unless otherwise specified in the prospectus supplement or term sheet,
KeySpan can terminate all of its obligations under the indenture with respect to
the debt securities, other than the obligation to pay interest on and the
principal of the debt securities and certain other obligations, at any time by:

          -    depositing money or U.S. government  obligations with the trustee
               in an amount  sufficient  to pay the principal of and interest on
               the debt securities to their maturity; and

          -    complying with certain other  conditions,  including  delivery to
               the trustee of an opinion of counsel to the effect  that  holders
               of debt  securities will not recognize  income,  gain or loss for
               federal income tax purposes as a result of KeySpan's defeasance.

         In addition, unless otherwise specified in the prospectus supplement or
term sheet, KeySpan can terminate all of its obligations under the indenture
with respect to the debt securities, including the obligation to pay interest on
and the principal of the debt securities, at any time by:

          -    depositing money or U.S. government  obligations with the trustee
               in an amount  sufficient  to pay the principal of and interest on
               the debt securities to their maturity, and

          -    complying with certain other  conditions,  including  delivery to
               the trustee of an opinion of counsel  stating that there has been
               a ruling  by the  Internal  Revenue  Service,  or a change in the
               federal  tax law since the date of the  indenture,  to the effect
               that holders of debt securities will not recognize  income,  gain
               or loss for federal  income tax purposes as a result of KeySpan's
               defeasance. (sections 402-404)

Payments of unclaimed moneys

         Moneys deposited with the trustee or any paying agent for the payment
of principal of or premium and interest on any debenture that remains unclaimed
for two years will be repaid to KeySpan at its request, unless the law requires
otherwise. If this happens and you want to claim these moneys, you must look to
KeySpan and not to the trustee or paying agent. (section 409)

Events of default, notices, and waiver

      Events of default

         An "event of default" regarding any series of debt securities is any
one of the following events:

          -    default  for 30 days in the payment of any  interest  installment
               when due and payable;

          -    default in the payment of  principal  or premium  when due at its
               stated  maturity,  by declaration,  when called for redemption or
               otherwise;

          -    default in the performance of any covenant in the debt securities
               or in the  indenture  by  KeySpan  for 60 days  after  notice  to
               KeySpan by the trustee or by holders of 25% in  principal  amount
               of the outstanding debt securities of that series;

          -    acceleration  of debt  securities of another  series or any other
               indebtedness  of KeySpan or one of its  Significant  Subsidiaries
               for borrowed money, in an aggregate  principal  amount  exceeding
               $25  million  under the terms of the  instrument  or  instruments
               under  which  the  indebtedness  is  issued  or  secured,  if the
               acceleration  is not annulled within 30 days after written notice
               as provided in the indenture;

          -    a final,  non-appealable  judgment  or order for the  payment  of
               money in excess of $25 million rendered against KeySpan or one of
               its  Significant  Subsidiaries  that is not  paid  or  discharged
               within 60 days following entry of such judgment or order;

          -    certain  events  of  bankruptcy,  insolvency  and  reorganization
               involving KeySpan; and

          -    any other event of default of that series  that is  specified  in
               the prospectus supplement or term sheet. (section 501)

         A default regarding a single series of debt securities will not
necessarily constitute a default regarding any other series.

         If an event of default for any series of debt securities occurs and is
continuing (other than an event of default involving the bankruptcy, insolvency
or reorganization of KeySpan), either the trustee or the holders of 25% in
principal amount of the outstanding debt securities of that series may declare
the principal (or, in the case of (a) OID debt securities, a lesser amount as
provided in those OID debt securities or (b) indexed debt securities, an amount
determined by the terms of those indexed debt securities), of all the debt
securities of that series, together with any accrued interest on the debt
securities, to be immediately due and payable by notice in writing to KeySpan.
If it is the holders of debt securities who give notice of that declaration of
acceleration to KeySpan, then they must also give notice to the trustee.
(section 502)

         If an event of default occurs which involves the bankruptcy, insolvency
or reorganization of KeySpan, as set forth above, then all unpaid principal
amounts (or, if the debt securities are (a) OID debt securities, then the
portion of the principal amount that is specified in those OID debt securities
or (b) indexed debt securities, an amount determined by the terms of those
indexed debt securities) and accrued interest on all debt securities of each
series will immediately become due and payable, without any action by the
trustee or any holder of debt securities. (section 502)

         In order for holders of debt securities to initiate proceedings for a
remedy under the indenture, holders of 25% in principal amount of those debt
securities must:

          -    first give notice to KeySpan as provided above;

          -    request that the relevant  trustee  initiate a proceeding  in its
               own name; and

          -    offer  that  trustee a  reasonable  indemnity  against  costs and
               liabilities.

If the trustee still refuses for 60 days to initiate the proceeding, and no
inconsistent direction has been given to the trustee by holders of a majority of
the debt securities of the same series, the holders may initiate a proceeding as
long as they do not adversely affect the rights of any other holders of that
series. (section 507)

         The holders of a majority in principal amount of the outstanding debt
securities of a series may rescind a declaration of acceleration if all events
of default, besides the failure to pay principal or interest due solely because
of the declaration of acceleration, have been cured or waived. (section 502)

         If KeySpan defaults on the payment of any installment of interest and
fails to cure the default within 30 days, or if KeySpan defaults on the payment
of principal when it becomes due, then the trustee may require KeySpan to pay
all amounts due to the trustee, with interest on the overdue principal or
interest payments, in addition to the expenses of collection. (section 503)

         A judgment for money damages by courts in the United States, including
a money judgment based on an obligation expressed in a foreign currency, will
ordinarily be rendered only in U.S. dollars. New York statutory law provides
that a court shall render a judgment or decree in the foreign currency of the
underlying obligation and that the judgment or decree shall be converted into
U.S. dollars at the exchange rate prevailing on the date of entry of the
judgment or decree. The indenture requires KeySpan to pay additional amounts
necessary to protect holders if a court requires a conversion to be made on a
date other than a judgment date.

      Notices

         The trustee is required to give notice to holders of a series of debt
securities of a default, which remains uncured or has not been waived and that
is known to the trustee, within 90 days after the default has occurred. If a
default occurs in the performance of any covenant in the debt securities or the
indenture, other than a default in the payment of principal of and premium or
interest on any of the debt securities, the trustee shall not give notice to the
holders of debt securities until 60 days after the occurrence of the default.
The trustee may withhold notice of a default if KeySpan and the trustee
determine that doing so is in the best interests of the holders, but may not
withhold the notice in the case of a default in the payment of principal of and
premium or interest on any of the debt securities or the deposit of any sinking
fund payment. (section 602)

      Waiver

         The holders of a majority in principal amount of the outstanding debt
securities of a series may waive any past default or event of default except a
default in the payment of principal of or premium or interest on the debt
securities of that series or a default relating to a provision that cannot be
amended without the consent of each affected holder. (section 513)

Reports

     KeySpan is required to file an officer's certificate with the trustee every
year  confirming  it is  complying  with all  conditions  and  covenants  in the
indenture. (section 1005)

         KeySpan must also file with the trustee copies of its annual reports
and the information and other documents which KeySpan may be required to file
with the SEC under Section 13 or Section 15(d) of the Securities Exchange Act of
1934, as amended. These documents must be filed with the trustee within 15 days
after they are required to be filed with the SEC. If KeySpan is not required to
file the information, documents or reports under either of these Sections, then
KeySpan must file with the trustee and the SEC, in accordance with the rules and
regulations of the SEC, the supplementary and periodic information, documents
and reports which may be required by Section 13 of the Exchange Act, in respect
of a debt security listed and registered on a national securities exchange, as
may be required by the rules and regulations of the SEC.

         Within 30 days of filing the information, documents or reports referred
to above with the trustee, KeySpan must mail to the holders of the debt
securities any summaries of the information, documents or reports which are
required to be sent to the holders by the rules and regulations of the SEC.
(section 704)

Rights and duties of the trustee

         The holders of a majority in principal amount of outstanding debt
securities of any series may direct the time, method and place of conducting any
proceeding for any remedy available to the trustees or exercising any trust or
other power conferred on the trustee. The trustee may decline to follow that
direction if it would involve the trustee in personal liability or would be
illegal. (section 512) During a default, the trustee is required to exercise the
standard of care and skill that a prudent man would exercise under the
circumstances in the conduct of his own affairs. (section 601) The trustee is
not obligated to exercise any of its rights or powers under the indenture at the
request or direction of any of the holders of debt securities unless those
holders have offered to the trustee reasonable security or indemnity. (section
603)

     The trustee is entitled,  in the absence of bad faith on its part,  to rely
on an officer's  certificate before taking action under the indenture.  (section
603)

Supplemental indentures

      Supplemental indentures not requiring consent of holders

         Without the consent of any holders of debt securities, KeySpan and the
trustees may supplement the indenture, among other things, to:

          -    pledge   property  to  the  trustee  as  security  for  the  debt
               securities;

          -    reflect that another entity has succeeded KeySpan and assumed its
               covenants  and  obligations  under  the debt  securities  and the
               indenture;

          -    cure any  ambiguity or  inconsistency  in the indenture or in the
               debt  securities  or  make  any  other  provisions  necessary  or
               desirable,  as long as the  interests  of the holders of the debt
               securities are not adversely affected in any material respect;

          -    issue  and  establish  the form and  terms of any  series of debt
               securities as provided in the indenture;

          -    add to KeySpan's  covenants  further covenants for the benefit of
               the holders of debt  securities and, if the covenants are for the
               benefit of less than all series of debt securities, stating which
               series are entitled to benefit;

          -    add any  additional  event of  default  and,  if the new event of
               default  applies  to fewer  than all  series of debt  securities,
               stating to which series it applies;

          -    change the trustee or provide for an additional trustee;

          -    provide additional  provisions for bearer debt securities so long
               as the action does not adversely  affect the interests of holders
               of any debt securities in any material respect; or

          -    modify the indenture in order to continue its qualification under
               the  Trust  Indenture  Act of  1939  or as may  be  necessary  or
               desirable in accordance  with  amendments  to that Act.  (section
               901)

      Supplemental indentures requiring consent of holders

         With the consent of the holders of at least a majority in principal
amount of the series of the debt securities that would be affected by a
modification of the indenture, the indenture permits KeySpan and the trustee to
supplement the indenture or modify in any way the terms of the indenture or the
rights of the holders of the debt securities. However, without the consent of
each holder of all of the debt securities affected by that modification, KeySpan
and the trustee may not:

          -    reduce the  principal of or premium on or change the stated final
               maturity of any debt security;

          -    reduce the rate of or change the time for  payment of interest on
               any debt security or, in the case of OID debt securities,  reduce
               the rate of accretion of the OID;

          -    change any of KeySpan's  obligations  to pay  additional  amounts
               under the indenture;

          -    reduce or alter the method of  computation  of any amount payable
               upon  redemption,  repayment or purchase of any debt  security by
               KeySpan,  or the time when the redemption,  repayment or purchase
               may be made;

          -    make the principal or interest on any debt security  payable in a
               currency  other than that  stated in the debt  security or change
               the place of payment;

          -    reduce the amount of principal  due on an OID debt  security upon
               acceleration  of maturity or provable in bankruptcy or reduce the
               amount  payable  under the terms of an indexed debt security upon
               acceleration of maturity or provable in bankruptcy;

          -    impair any right of  repayment  or  purchase at the option of any
               holder of debt securities;

          -    impair the conversion rights of any holder of debt securities;

          -    modify the right of any holder of debt  securities  to receive or
               sue for payment of the  principal or interest on a debt  security
               that  would be due and  payable at the  maturity  thereof or upon
               redemption; or

          -    reduce the principal amount of the outstanding debt securities of
               any series  required to supplement  the indenture or to waive any
               of its provisions. (section 902)

         A supplemental indenture which modifies or eliminates a provision
intended to benefit the holders of one series of debt securities will not affect
the rights under the indenture of holders of other series of debt securities.

Redemption

         The specific terms of any redemption of a series of debt securities
will be contained in the prospectus supplement or term sheet for that series.
Generally, KeySpan must send notice of redemption to the holders at least 30
days but not more than 60 days prior to the redemption date. The notice will
specify:

          -    the principal amount being redeemed;

          -    the redemption date;

          -    the redemption price;

          -    the place or places of payment;

          -    the CUSIP number of the debt securities being redeemed;

          -    whether the redemption is pursuant to a sinking fund;

          -    that on the  redemption  date,  interest,  or, in the case of OID
               debt securities,  original issue discount,  will cease to accrue;
               and

          -    if bearer debt securities are being  redeemed,  that those bearer
               debt securities must be accompanied by all coupons maturing after
               the redemption  date or the amount of the missing coupons will be
               deducted  from  the  redemption   price,  or  indemnity  must  be
               furnished,  and  whether  those  bearer  debt  securities  may be
               exchanged for  registered  debt  securities  not being  redeemed.
               (section 1104)

         On or before any redemption date, KeySpan will deposit an amount of
money with the trustee or with a paying agent sufficient to pay the redemption
price. (section 1103)

         If less than all the debt securities are being redeemed, the trustee
shall select the debt securities to be redeemed using a method it considers
fair. (section 1103) After the redemption date, holders of debt securities which
were redeemed will have no rights with respect to the debt securities except the
right to receive the redemption price and any unpaid interest to the redemption
date. (section 1106)

Concerning the trustee

         KeySpan has customary banking relationships with the trustee, The Chase
Manhattan Bank. Among other services, The Chase Manhattan Bank provides KeySpan
with cash management and credit services, including payroll account, lockbox,
foreign exchange and investment custody account services. The Chase Manhattan
Bank also serves or has served as administrative agent and trustee with respect
to other issuances of debt by KeySpan and its subsidiaries and is a member of a
syndicate of banks which is party to several credit facilities with KeySpan in a
total amount of $2 billion. In addition, Chase Securities Inc., an affiliate of
The Chase Manhattan Bank, acts as a placement agent for KeySpan's commercial
paper program.

Governing law

     The laws of the State of New York govern the  indenture and will govern the
debt securities. (section 112)









                         DESCRIPTION OF PREFERRED STOCK


         The following briefly summarizes the material terms of KeySpan's
preferred stock, other than pricing and related terms disclosed in the
accompanying prospectus supplement or term sheet. You should read the particular
terms of any series of preferred stock offered by KeySpan, which will be
described in more detail in any prospectus supplement or term sheet relating to
that series, together with the more detailed provisions of KeySpan's certificate
of incorporation and the certificate of amendment relating to each particular
series of preferred stock for provisions that may be important to you. The
certificate of amendment relating to the particular series of preferred stock
offered by the applicable prospectus supplement and this prospectus will be
filed as an exhibit to a document incorporated by reference in the registration
statement. The prospectus supplement will also state whether any of the terms
summarized below do not apply to the series of preferred stock being offered.

General

         As of March 31, 2001, KeySpan was authorized to issue 83,000,000 shares
of preferred stock, par value $.01 per share, 16,000,000 shares of preferred
stock, par value $25 per share and 1,000,000 shares of preferred stock, par
value $100 per share.

         At March 31, 2001, KeySpan had 92,050 shares of 6% Series A ESOP
Convertible Preferred Stock, par value $100 per share, outstanding; 553,000
shares of 7.07% Preferred Stock Series B, par value $100 per share, outstanding;
and 197,000 shares of 7.17% Preferred Stock Series C, par value $100 per share,
outstanding. Shares of Series A Preferred Stock were issued to trustees acting
on behalf of a KeySpan employee benefit plan; they are convertible into shares
of KeySpan's common stock at the option of the holder, redeemable at KeySpan's
option beginning January 1, 2004, and redeemable at the option of the holder
under specified circumstances. Shares of both the Series B and Series C
Preferred Stock are redeemable at KeySpan's option beginning May 28, 2003, and
mandatorily redeemable on May 28, 2005, in the case of the Series B Preferred
Stock, and on May 28, 2008, in the case of the Series C Preferred Stock.
Additionally, if KeySpan fails to pay dividends on either the Series B and
Series C Preferred Stock for four consecutive quarterly dividend periods,
holders of both series will have the right to appoint two directors to KeySpan's
board or directors, who shall remain on the board as long as all dividends on
the Series B and Series C Preferred Stock remain unpaid. You should read the
more detailed provisions of KeySpan's certificate of incorporation or the
certificate of amendment relating to a series of outstanding preferred stock for
provisions that may be important to you.

         Under KeySpan's certificate of incorporation, its board of directors is
authorized to issue shares of preferred stock in one or more series, and to
establish from time to time a series of preferred stock with the following terms
specified:

          -    the number of shares to be included in the series;

          -    the designation,  powers, preferences and rights of the shares of
               the series; and

          -    the  qualifications,  limitations or restrictions of that series,
               except as otherwise stated in the certificate of incorporation.

         Prior to the issuance of any series of preferred stock, KeySpan's board
of directors will create and designate the series as a series of preferred stock
in a certificate of amendment to the certificate of incorporation. The term
"board of directors" includes any duly authorized committee of the board.

         The rights of holders of the preferred stock offered may be adversely
affected by the rights of holders of any shares of preferred stock that may be
issued in the future. The board of directors may cause shares of preferred stock
to be issued in public or private transactions for any proper corporate purpose.
Examples of proper corporate purposes include issuances to obtain additional
financing in connection with acquisitions or otherwise, and issuances to
officers, directors and employees of KeySpan and its subsidiaries pursuant to
benefit plans or otherwise. Shares of preferred stock issued by KeySpan may have
the effect of rendering more difficult or discouraging an acquisition of KeySpan
that is deemed undesirable by its board of directors.

         The preferred stock will be, when issued, fully paid and nonassessable.
Holders of preferred stock will not have any preemptive or subscription rights
to acquire more stock of KeySpan.

         The transfer agent, registrar, dividend disbursing agent and redemption
agent for shares of each series of preferred stock will be named in the
prospectus supplement relating to that series.

Rank

         Unless otherwise specified in the prospectus supplement relating to the
shares of any series of preferred stock, those shares will rank on an equal
basis with each other series of preferred stock and prior to the common stock as
to dividends and distributions of assets.

Dividends

         Each series of preferred stock may provide that holders of that series
are entitled to receive cash dividends, when, as and if declared by KeySpan's
board of directors out of funds legally available for dividends. The rates and
dates of payment of dividends will be set forth in the prospectus supplement
relating to each series of preferred stock. Dividends will be payable to holders
of record of preferred stock as they appear on KeySpan's books or, if
applicable, the records of the depositary referred to below under "Description
of Depositary Shares," on the record dates fixed by the board of directors.
Dividends on any series of preferred stock may be cumulative or noncumulative.

         KeySpan may not declare, pay or set apart for payment dividends on the
preferred stock unless full cumulative dividends on any other series of
preferred stock that ranks on an equal or senior basis have been paid or
sufficient funds have been or are simultaneously set apart for payment for all
of the other series of preferred stock that pay dividends on a cumulative basis;
or the immediately preceding dividend period of the other series of preferred
stock that pay dividends on a noncumulative basis.

         Partial dividends declared on shares of preferred stock and any other
series of preferred stock ranking on an equal basis as to dividends will be
declared pro rata. A pro rata declaration means that the ratio of dividends
declared per share to accrued dividends per share will be the same for both
series of preferred stock.

         Similarly, KeySpan may not declare, pay or set apart for payment
non-stock dividends or make other payments on the common stock or any other
stock of KeySpan ranking junior to the preferred stock until full dividends on
the preferred stock have been paid or set apart for payment for

          -    all prior dividend  periods if the preferred stock pays dividends
               on a cumulative basis; or

          -    the immediately  preceding dividend period if the preferred stock
               pays dividends on a noncumulative basis.

Conversion and Exchange

         The prospectus supplement for any series of preferred stock will state
the terms, if any, on which shares of that series are convertible into or
exchangeable for shares of KeySpan common stock or common stock of a third
party.

Redemption

         If so specified in the applicable prospectus supplement, a series of
preferred stock may be redeemable at KeySpan's or the holder's option and/or may
be mandatorily redeemed. Any partial redemptions of preferred stock will be made
in a way that the board of directors decides is equitable.

         Unless KeySpan defaults in the payment of the redemption price,
dividends will cease to accrue after the redemption date on shares of preferred
stock called for redemption and all rights of holders of those shares will
terminate except for the right to receive the redemption price.

Liquidation Preference

         Upon any voluntary or involuntary liquidation, dissolution or winding
up of KeySpan, holders of each series of preferred stock will be entitled to
receive distributions upon liquidation in the amount set forth in the prospectus
supplement relating to that series of preferred stock, plus an amount equal to
any accrued and unpaid dividends. Those distributions will be made before any
distribution is made on any securities ranking junior relating to liquidation,
including common stock.

         If the liquidation amounts payable relating to the preferred stock of
any series and any other securities ranking on a parity regarding liquidation
rights are not paid in full, the holders of the preferred stock of that series
and other securities will share in any distribution of KeySpan's available
assets on a ratable basis in proportion to the full liquidation preferences.
Holders of that series of preferred stock will not be entitled to any other
amounts from KeySpan after they have received their full liquidation preference.

Voting Rights

         The holders of shares of preferred stock will have no voting rights,
except:

          -    as otherwise stated in the prospectus supplement;

          -    as otherwise stated in the certificate of amendment  establishing
               that series; or

          -    as required by applicable law.









                        DESCRIPTION OF DEPOSITARY SHARES


         The following briefly summarizes the material provisions of the deposit
agreement and of the depositary shares and depositary receipts, other than
pricing and related terms disclosed in the accompanying prospectus supplement or
term sheet. You should read the particular terms of any depositary shares and
any depositary receipts that are offered by KeySpan and any deposit agreement
relating to a particular series of preferred stock which will be described in
more detail in a prospectus supplement or term sheet. The prospectus supplement
or term sheet will also state whether any of the generalized provisions
summarized below do not apply, or additional provisions apply, to the depositary
shares or depositary receipts being offered. A copy of the form of deposit
agreement, including the form of depositary receipt, is incorporated by
reference as an exhibit in the registration statement of which this prospectus
forms a part. You should read the more detailed provisions of the deposit
agreement and the form of depositary receipt for provisions that may be
important to you.

General

         KeySpan may, at its option, elect to offer fractional shares of
preferred stock, rather than full shares of preferred stock. If KeySpan does so,
it will issue receipts for depositary shares, each of which will represent a
fraction of a share of a particular series of preferred stock.

         The shares of any series of preferred stock represented by depositary
shares will be deposited under a deposit agreement between KeySpan and a bank or
trust company selected by KeySpan having its principal office in the United
States and having a combined capital and surplus of at least $50,000,000, as
preferred stock depositary. Each owner of a depositary share will be entitled to
all the rights and preferences of the underlying preferred stock, including
dividend, voting, redemption, conversion and liquidation rights, in proportion
to the applicable fraction of a share of preferred stock represented by that
depositary share.

         The depositary shares will be evidenced by depositary receipts issued
under the deposit agreement. Depositary receipts will be distributed to those
persons purchasing the fractional shares of preferred stock in accordance with
the terms of the applicable prospectus supplement.

Dividends and other distributions

         The preferred stock depositary will distribute all cash dividends or
other cash distributions received in respect of the deposited preferred stock to
the record holders of depositary shares relating to that preferred stock in
proportion to the number of depositary shares owned by those holders. (section
4.01)

         The preferred stock depositary will distribute any property received by
it other than cash to the record holders of depositary shares entitled thereto.
If the preferred stock depositary determines that it is not feasible to make
distributions, it may, with KeySpan's approval, sell that property and
distribute the net proceeds from that sale to those holders. (section 4.02)

Redemption of preferred stock

         If a series of preferred stock represented by depositary shares is to
be redeemed, the depositary shares will be redeemed from the proceeds received
by the preferred stock depositary resulting from the redemption, in whole or in
part, of that series of preferred stock. The depositary shares will be redeemed
by the preferred stock depositary at a price per depositary share equal to the
applicable fraction of the redemption price per share payable in respect of the
shares of preferred stock so redeemed.

         Whenever KeySpan redeems shares of preferred stock held by the
preferred stock depositary, the preferred stock depositary will redeem as of the
same date the number of depositary shares representing shares of preferred stock
so redeemed. If fewer than all the depositary shares are to be redeemed, the
depositary shares to be redeemed will be selected by the preferred stock
depositary by lot or ratably or by any other equitable method as the preferred
stock depositary may decide. (section 2.03)

Conversion of depositary shares

         The depositary shares, as such, are not convertible into shares of
common stock or any other securities or property of KeySpan. Nevertheless, if so
provided in the applicable prospectus supplement, holders may surrender their
depositary receipts to the depositary with written instructions to the
depositary to instruct KeySpan to convert the preferred stock represented by the
depositary shares evidenced by those depositary receipts into whole shares of
common stock. Upon receipt of instructions and any amounts payable in respect of
the conversion, KeySpan will cause the delivery of:

          -    a  certificate  or  certificates  evidencing  the number of whole
               shares of common stock into which the preferred stock represented
               by the depositary shares evidenced by those depositary receipt or
               depositary receipts has or have been converted; and

          -    any money or other property to which the holder is entitled.

         If the depositary shares represented by a depositary receipt are to be
converted in part only, a new depositary receipt or depositary receipts will be
issued for any depositary shares not to be converted. No fractional shares of
common stock will be issued upon conversion, and if any conversion will result
in a fractional share being issued, an amount will be paid in cash by KeySpan
equal to the value of the fractional interest based on the closing price of the
common stock on the last business day prior to the conversion.
(section 2.04)

Voting deposited preferred stock

         Upon receipt of notice of any meeting at which the holders of any
series of deposited preferred stock are entitled to vote, the preferred stock
depositary will mail the information contained in that notice of meeting to the
record holders of the depositary shares relating to that series of preferred
stock. Each record holder of depositary shares on the record date will be
entitled to instruct the preferred stock depositary to vote the amount of the
preferred stock represented by that holder's depositary shares. The preferred
stock depositary will try to vote the amount of that series of preferred stock
represented by the depositary shares in accordance with those instructions.

         KeySpan will agree to take all actions that the preferred stock
depositary determines as necessary to enable the preferred stock depositary to
vote as instructed. The preferred stock depositary will abstain from voting
shares of any series of preferred stock held by it for which it does not receive
specific instructions from the holders of depositary shares representing those
shares. (section 4.05)

Amendment and termination of the deposit agreement

         The form of depositary receipt evidencing the depositary shares and any
provision of the deposit agreement may at any time be amended by agreement
between KeySpan and the preferred stock depositary. However, any amendment that
materially and adversely alters any existing right of the holders of depositary
shares will not be effective unless the amendment has been approved by the
holders of at least a majority of the depositary shares then outstanding. Every
holder of an outstanding depositary receipt at the time any amendment becomes
effective will be deemed, by continuing to hold the depositary receipt, to
consent and agree to the amendment and to be bound by the deposit agreement,
which has been amended thereby. (section 6.01) The deposit agreement may be
terminated only if:

          -    all outstanding depositary shares have been redeemed; or

          -    final  distribution  in respect of the  preferred  stock has been
               made to the holders of depositary  shares in connection  with any
               liquidation, dissolution or winding up of KeySpan. (section 6.02)

Charges of preferred stock depositary; taxes and other governmental charges

         KeySpan will pay all transfer and other taxes and governmental charges
arising solely from the existence of the depositary arrangements. KeySpan will
also pay charges of the depositary in connection with the initial deposit of
preferred stock and any redemption of preferred stock. Holders of depositary
receipts will pay other transfer and other taxes and governmental charges and
other charges, including a fee for the withdrawal of shares of preferred stock
upon surrender of depositary receipts, as are expressly provided in the deposit
agreement to be for their accounts. (section 5.07)

Resignation and removal of depositary

         The preferred stock depositary may resign at any time by delivering to
KeySpan notice of its intent to do so, and KeySpan may at any time remove the
preferred stock depositary, any resignation or removal to take effect upon the
appointment of a successor preferred stock depositary and its acceptance of the
appointment. The successor preferred stock depositary must be appointed within
60 days after delivery of the notice of resignation or removal and must be a
bank or trust company having its principal office in the United States and
having a combined capital and surplus of at least $50,000,000. (section 5.04)

Miscellaneous

         The preferred stock depositary will forward all reports and
communications from KeySpan which are delivered to the preferred stock
depositary and which KeySpan is required to furnish to the holders of the
deposited preferred stock. (section 5.05)

         Neither the preferred stock depositary nor KeySpan will be liable if it
is prevented or delayed by law or any circumstances beyond its control in
performing its obligations under the deposit agreement. KeySpan's obligations
and those of the preferred stock depositary under the deposit agreement will be
limited to performance in good faith of their duties thereunder and neither
KeySpan nor the preferred stock depositary will be obligated to prosecute or
defend any legal proceeding in respect of any depositary shares, depositary
receipts or shares of preferred stock unless satisfactory indemnity is
furnished. KeySpan and the preferred stock depositary may rely upon written
advice of counsel or accountants, or upon information provided by holders of
depositary receipts or other persons believed to be competent and on documents
believed to be genuine. (section 5.03)









                  DESCRIPTION OF THE TRUST PREFERRED SECURITIES


         The trust preferred securities will be issued pursuant to amended and
restated declarations of trust. Each declaration will be qualified under the
Trust Indenture Act of 1939. The Chase Manhattan Bank will act as trustee under
the declaration for purposes of the Trust Indenture Act. The terms of the trust
preferred securities will include those stated in the relevant amended and
restated declaration and those made part of the declaration by the Trust
Indenture Act. The declaration will be filed as an exhibit to a document
incorporated by reference in the registration statement of which this prospectus
forms a part.

         The following briefly summarizes the material provisions of the amended
and restated declarations of trust and the trust preferred securities, other
than the pricing and related terms disclosed in an applicable prospectus
supplement. You should also read the particular terms of a series of trust
preferred securities, which will be described in more detail in the applicable
prospectus supplement. The prospectus supplement will also state whether any of
the generalized provisions summarized below do not apply, or additional
provisions apply, to the trust preferred securities being offered. Wherever
particular sections or defined terms of the amended and restated declaration of
trust are referred to, those sections or defined terms are incorporated into
this prospectus by reference, and the statement in this prospectus is qualified
by their reference.

General

         The declaration authorizes the regular trustees to issue both common
and trust preferred securities representing undivided beneficial interests in
the assets of the trust. (section 3.6) KeySpan will own all of the common
securities directly or indirectly. (section 5.2) The common securities will rank
equally, and payments will be made on the common securities on a ratable basis,
with the trust preferred securities. If an event of default under the
declaration occurs and continues, however, the rights of the holders of the
common securities to receive payment of periodic distributions and payments upon
liquidation, redemption and otherwise will be subordinated to the rights of the
holders of the trust preferred securities. (section 7.1) The declaration does
not permit the issuance of any other securities or the incurrence of any
indebtedness by the trust. (section 3.7)

         Under the declaration, the property trustee will hold title to the
junior subordinated debt securities issued to the trust for the benefit of the
holders of the trust securities. (section 3.8) The payment of distributions out
of money held by the trust, and payments upon redemption of the trust securities
or liquidation of the trust out of money held by the trust, are guaranteed by
KeySpan to the extent described under "Description of the guarantee." The
guarantee will be held by The Chase Manhattan Bank, the guarantee trustee, for
the benefit of the holders of the trust preferred securities. The guarantee does
not cover payment of distributions when the trust does not have sufficient
available funds to pay distributions. In that event, the remedy of a holder of
trust preferred securities is to:

          -    vote to direct  the  property  trustee to  enforce  the  property
               trustee's  rights under the junior  subordinated  debt securities
               (section 7.5); or

          -    if the failure of the trust to pay  distributions is attributable
               to  KeySpan's  failure to pay interest or principal on the junior
               subordinated  debt  securities,  sue KeySpan for  enforcement  of
               payment  to the  holder  of an  amount  equal  to  the  aggregate
               liquidation  amount of its trust preferred  securities.  (section
               3.8)

Distributions

         Distributions on the trust preferred securities will accrue at the rate
specified in the applicable prospectus supplement. The amount of distributions
payable for any period will be computed on the basis of a 360-day year of twelve
30-day months.

         Distributions on the trust preferred securities will be cumulative,
will accrue from the date the trust issues the trust preferred securities and
will be paid in arrears on the dates specified in the applicable prospectus
supplement, unless they are deferred as described below. (section 7.2)

Deferral of distributions

         KeySpan has the right under the indenture to defer interest payments on
the junior subordinated debt securities for a period not exceeding five years
during which no interest will be due and payable. A deferral of interest
payments cannot extend, however, beyond the maturity of the junior subordinated
debt securities. As a consequence of any deferral, distributions on the trust
preferred securities also would be deferred. During a deferral period, the
amount of distributions due to you would continue to accumulate and deferred
distributions will themselves accrue additional distributions. When this
prospectus refers to any payment of distributions, distributions include any of
those additional distributions unless otherwise stated. (section 7.2)

         Upon the termination of any deferral period and the payment of all
amounts then due, KeySpan may commence a new deferral period as discussed above.
Consequently, there could be several deferral periods of varying lengths
throughout the term of the junior subordinated debt securities. The regular
trustees will give the holders of the trust preferred securities notice of any
deferral period upon their receipt of notice from KeySpan. (section 3.6) If
distributions are deferred, the deferred distributions on those distributions
will be paid to holders of record of the trust preferred securities as they
appear on the securities register of the trust on the record date following the
termination of the deferral period. (section 7.2) See "Description of the junior
subordinated debt securities."

Payment of distributions

         Distributions on the trust preferred securities will be payable to the
holders named on the securities register of the trust at the close of business
on the relevant record dates. As long as the trust preferred securities remain
in book-entry only form, the record dates will be one business day before the
distribution dates. Distributions will be paid through the property trustee who
will hold amounts received on the junior subordinated debt securities in a
property account for the benefit of the holders of the trust securities. Unless
any applicable laws and regulations and the provisions of the declaration state
otherwise, each payment will be made as described under "-Book-entry only
issuance" below.

         If the trust preferred securities do not continue to remain in
book-entry only form, the relevant record dates will conform to the rules of any
securities exchange on which the trust preferred securities are listed. If any
date on which distributions are to be made on the trust preferred securities is
not a business day, then payment of the distributions payable on that date will
be made on the next day which is a business day, and without any interest or
other payment in respect of any delay. However, if that business day is in the
next calendar year, the payment will be made on the immediately preceding
business day. A "business day" means any day other than Saturday, Sunday or any
other day on which banking institutions in New York City are permitted or
required by law to close. (section 7.2)

Redemption

         The trust preferred securities will be redeemed upon the maturity of
the junior subordinated debt securities or to the extent the junior subordinated
debt securities are redeemed. The junior subordinated debt securities will
mature on the date specified in the applicable prospectus supplement, and may be
redeemed, in whole or in part, at any time on or after the date specified in the
applicable prospectus supplement. The junior subordinated debt securities can
also be redeemed at any time, in whole or in part, in certain circumstances upon
the occurrence of a tax event or an investment company event.

         Upon the maturity of the junior subordinated debt securities, the
proceeds of their repayment will simultaneously be applied to redeem all
outstanding trust securities at the redemption price. Upon the redemption of the
junior subordinated debt securities, whether in whole or in part, either at
KeySpan's option or pursuant to a tax or investment company event, the trust
will use the cash it receives upon the redemption to redeem trust securities
having an aggregate liquidation amount equal to the aggregate principal amount
of the junior subordinated debt securities so redeemed at the redemption price.
Holders of trust securities will be given not less than 30 days' notice, before
any redemption. (section 7.3)

Special event redemption

         "Tax event" means that the regular trustees will have received an
opinion of an independent tax counsel experienced in such matters which states
that, as a result of any:

          -    amendment to, or change in, or announced  proposed change in, the
               laws  or  associated  regulations  of the  United  States  or any
               political  subdivision or taxing  authority of the United States;
               or

          -    official   administrative   pronouncement,   action  or  judicial
               decision  interpreting  or  applying  those laws or  regulations,
               there is more than an insubstantial  risk currently or within the
               90 days following that opinion that:

          -    the trust would be required to pay United States  federal  income
               tax  relating  to  income  accrued  or  received  on  the  junior
               subordinated debt securities;

          -    interest  payable  to the trust on the junior  subordinated  debt
               securities  would not be  deductible by KeySpan for United States
               federal income tax purposes; or

          -    the trust would be required to pay more than a minimal  amount of
               other taxes, duties or other governmental charges. (section 1.1)

         "Investment company event" means that the regular trustees will have
received an opinion of a nationally recognized independent counsel which states
that, as a result of the occurrence of a change in law or regulation or a
written change in interpretation or application of law or regulation by any
legislative body, court, governmental agency or regulatory authority, there is
more than an insubstantial risk that the trust is or will be considered an
"investment company" which is required to be registered under the Investment
Company Act of 1940. (section 1.1)

         This prospectus refers to a tax event and an investment company event
as "special events." If a special event occurs and continues, KeySpan may, upon
not less than 30 days' notice, redeem the junior subordinated debt securities,
in whole or in part, for cash within 90 days following the occurrence of the
special event.

Redemption procedures

         The trust may not redeem fewer than all of the outstanding trust
preferred securities unless all accrued and unpaid distributions thereon have
been paid.

         Once notice of redemption is given and funds are irrevocably deposited,
distributions will cease to accrue and all rights of holders of trust preferred
securities called for redemption will cease, except the right of the holders to
receive the redemption price, but without interest on the redemption price. If
any redemption date is not a business day, then payment of the redemption price
payable on such date will be made on the succeeding day that is a business day,
without any interest or other payment in respect of any such delay. However, if
that business day falls in the next calendar year, payment will be made on the
preceding business day.

         If payment of the redemption price for any trust preferred securities
is improperly withheld or refused and not paid either by the trust or by KeySpan
under the guarantee, distributions on those trust preferred securities will
continue to accrue at the then applicable rate from the original redemption date
to the date of payment. In this case, the actual payment date will be the
redemption date for purposes of calculating the redemption price.

         In the event that fewer than all of the outstanding trust preferred
securities are to be redeemed, the trust preferred securities will be redeemed
in accordance with the depositary's standard procedures.

         KeySpan or its subsidiaries may, at any time, and from time to time,
purchase outstanding trust preferred securities by tender, in the open market or
by private agreement, provided that it complies with United States federal
securities laws and any other applicable laws. (section 7.4)

Distribution of the junior subordinated debt securities

         KeySpan will have the right at any time to dissolve the trust. After
satisfying the liabilities of its creditors, the trust may distribute junior
subordinated debt securities in exchange for the trust preferred securities.
(section 8.2)

         There can be no assurance as to the market prices for either the trust
preferred securities or the junior subordinated debt securities that may be
distributed in exchange for the trust preferred securities if a dissolution and
liquidation of the trust were to occur. This means that the trust preferred
securities that an investor may purchase, whether pursuant to the offer made by
this prospectus or in the secondary market, or the junior subordinated debt
securities that an investor may receive if a dissolution and liquidation of the
trust were to occur, may trade at a discount to the price that the investor paid
to purchase the trust preferred securities offered by this prospectus.

Trust enforcement events

         Upon the occurrence of an indenture event of default (as described
below), the property trustee as the sole holder of the junior subordinated debt
securities will have the right under the indenture to declare the principal of
and interest on the junior subordinated debt securities to be immediately due
and payable.

         If the property trustee fails to enforce its rights under the junior
subordinated debt securities, any holder of trust preferred securities may
directly institute a legal proceeding against KeySpan to enforce these rights
without first suing the property trustee or any other person or entity. If a
trust enforcement event has occurred and is continuing and the event is
attributable to KeySpan's failure to pay interest or principal on the junior
subordinated debt securities on the date that interest or principal is otherwise
payable, then a holder of trust preferred securities may also bring a direct
action against KeySpan.

         An "indenture event of default" is an event of default under the
indenture and also constitutes a "trust enforcement event," which is an event of
default under the declaration relating to the trust securities. Under the
declaration, however, the holder of the common securities will be deemed to have
waived any trust enforcement event relating to the common securities until all
trust enforcement events relating to the trust preferred securities have been
cured, waived or otherwise eliminated. Until any trust enforcement events
relating to the trust preferred securities have been so cured, waived, or
otherwise eliminated, the property trustee will be deemed to be acting solely on
behalf of the holders of the trust preferred securities. Only the holders of the
trust preferred securities will have the right to direct the property trustee as
to matters under the declaration, and therefore the indenture. (section 2.6)

Voting rights

         Except as described in this prospectus under "Description of the
guarantee--Modification of guarantee; assignment," and except as required by
law, the holders of the trust preferred securities will have no voting rights.

         The holders of a majority in aggregate liquidation amount of the trust
preferred securities have the right to direct any proceeding for any remedy
available to the property trustee, including to:

          -    exercise the remedies available to it under the indenture;

          -    waive any past  indenture  event of default and its  consequences
               that is waivable under the indenture; or

          -    consent  to any  amendment,  modification  or  termination  where
               consent is required.

         Any required approval or direction of holders of trust preferred
securities may be given at a separate meeting of holders of trust preferred
securities convened for that purpose, at a meeting of all of the holders of
trust securities or by written consent.

         If an indenture event of default has occurred and not been cured, the
holders of 25% of the aggregate liquidation amount of the trust preferred
securities may direct the property trustee to declare the principal and interest
on the junior subordinated debt securities due and payable. However, where a
consent or action under the indenture would require the consent of more than a
majority of the aggregate principal amount of debt securities affected thereby,
consent from the holders of that greater percentage would be required. See
"Description of the junior subordinated debt securities--Modifications and
amendments."

         Despite the fact that holders of trust preferred securities are
entitled to vote or consent under the circumstances described above, any of the
trust preferred securities that are owned at the time by KeySpan or any entity
directly or indirectly controlling or controlled by, or under direct or indirect
common control with, KeySpan, will not be entitled to vote or consent. Instead,
these trust preferred securities will be treated as if they were not
outstanding.

         The procedures by which holders of trust preferred securities may
exercise their voting rights are described below in "-Book-entry only issuance."

         Holders of the trust preferred securities generally will have no rights
to appoint or remove the regular trustees. Instead, the trustees may be
appointed, removed or replaced solely by KeySpan as the indirect or direct
holder of all of the common securities. (section 7.5)

Modification of the declaration

         The declaration may be amended from time to time without the consent of
the holders of the trust preferred securities:

          -    to cure any  ambiguity or correct or  supplement  any  provisions
               that may be defective or inconsistent with any other provision;

          -    to add to the covenants,  restrictions  or obligations of KeySpan
               in its capacity as sponsor of the trust;

          -    to  conform  to any  change  in Rule 3a-5  under  the  Investment
               Company  Act of 1940  or  written  change  in  interpretation  or
               application  of  than  rule  by  any  legislative   body,  court,
               government agency or regulatory authority; or

          -    to modify,  eliminate  or add to any  provisions  as necessary to
               ensure  that the  trust  will be  classified  for  United  States
               federal income tax purposes as a grantor trust at all times or to
               ensure  that the trust will not be  required  to  register  as an
               investment company under the Investment Company Act of 1940.

         Amendments made without the consent of the trust preferred securities
cannot adversely affect in any material respect the rights of the holders of
preferred or common securities.

         The declaration of trust may also be amended as to other matters with
the consent of holders of at least 66 2/3% of the outstanding trust preferred
securities. However, without the consent of each affected holder of preferred or
common securities, the declaration of trust may not be amended to:

          -    change  the  amount or timing of any  distribution  or  otherwise
               adversely  affect the amount of any  distribution  required to be
               made; or

          -    restrict  the  right  of a  holder  to  institute  suit  for  the
               enforcement of any payment.

     Despite the  foregoing,  no  amendment or  modification  may be made to the
declaration if such amendment or modification would

          -    cause the trust to be classified for United States federal income
               tax purposes as other than a grantor trust, or

          -    cause the trust to be deemed  an  "investment  company"  which is
               required to be  registered  under the  Investment  Company Act of
               1940. (section 11.1)

Global securities

         If a trust issues trust preferred securities in the form of one or more
global securities, then that trust will register the global securities in the
name of the depositary for the global securities or the nominee of the
depositary and the global securities will be delivered by the trustee to the
depositary for credit to the accounts of the holders of beneficial interests in
the trust preferred securities.

         The prospectus supplement will describe the specific terms of the
depositary arrangement for trust preferred securities that are issued in global
form. None of KeySpan, the trusts, the relevant trustees, any paying agent or
the security registrar will have any responsibility or liability for any aspect
of the records relating to or payments made on account of beneficial ownership
interests in a global trust preferred security or for maintaining, supervising
or reviewing any records relating to these beneficial ownership interests.
(section 7.12)

Information concerning the property trustee

         Prior to the occurrence of a default relating to the trust securities,
the property trustee undertakes to perform only those duties as are specifically
set forth in the declaration. After a default, the property trustee will
exercise the same degree of care as a prudent individual would exercise in the
conduct of his or her own affairs. The property trustee is under no obligation
to exercise any of the powers vested in it by the declaration at the request of
any holder of trust preferred securities unless offered reasonable indemnity by
the holder against the costs, expenses and liabilities which might be incurred
thereby. (section 6.3)

Paying agent

         If the trust preferred securities do not remain in book-entry only
form, the following provisions will apply:

          -    the property trustee will act as paying agent; and

          -    registration of transfers of trust  preferred  securities will be
               effected  without  charge  (other  than in  respect of any tax or
               other government charge). (section 7.7)

Description of junior subordinated debt securities

         The junior subordinated debt securities which KeySpan will issue to the
trust in exchange for its common and preferred securities will be issued
pursuant to the indenture between KeySpan and The Chase Manhattan Bank, as the
indenture trustee, described in "Description of Debt Securities" above. The
indenture will be qualified under the Trust Indenture Act of 1939. The terms of
the junior subordinated debt securities will include those stated in the
indenture and those made a part of the indenture by the Trust Indenture Act. The
following summary of the material terms of the junior subordinated debt
securities is not intended to be complete and is qualified by the applicable
prospectus supplement, the indenture, the Trust Indenture Act and other
applicable law. The indenture (including all amendments) has been filed with the
SEC as an exhibit to, and is incorporated by reference in, the registration
statement of which this prospectus forms a part.

      General

         The junior subordinated debt securities will be issued as unsecured
debt under the indenture. The junior subordinated debt securities will be
limited in aggregate principal amount to the sum of the aggregate stated
liquidation amount of the trust preferred securities and the common securities
and will be subordinated and junior in right of payment to all of KeySpan's
senior debt and may be subordinated to some of KeySpan's subordinated debt.

         The entire principal amount of the junior subordinated debt securities
will mature and become due and payable, together with any accrued and unpaid
interest thereon, on the date specified in the applicable prospectus supplement.

         If junior subordinated debt securities are distributed to holders of
trust preferred securities in liquidation of the holders' interests in the
trust, the junior subordinated debt securities will initially be issued in the
form of one or more global securities under depositary arrangements similar to
those in effect for the trust preferred securities. In the event junior
subordinated debt securities are issued in certificated form, principal and
interest will be payable, the transfer of the junior subordinated debt
securities will be registrable and junior subordinated debt securities will be
exchangeable for securities of other denominations of a like aggregate principal
amount at the corporate trust office of the indenture trustee in New York, New
York.
(section 7.2)

      Redemption

         KeySpan shall have the right to redeem the junior subordinated debt
securities as described above under "Description of the Trust Preferred
Securities? Redemption." The redemption price will be specified in the
applicable prospectus supplement.

      Interest

         The junior subordinated debt securities will bear interest at the rate
specified in the applicable prospectus supplement, payable in arrears on the
dates specified in the applicable prospectus supplement, unless interest is
deferred as described below. Interest will be paid to the person in whose name
the junior subordinated debt security is registered, with limited exceptions, at
the close of business on the business day next preceding the interest payment
date. In the event the junior subordinated debt securities shall not continue to
remain in book-entry only form, KeySpan will select appropriate record dates.

         The amount of interest payable for any period will be computed on the
basis of a 360-day year of twelve 30-day months. The amount of interest payable
for any period shorter than a full period will be computed on the basis of the
actual number of days elapsed per 30-day month. If any date on which interest is
payable on the junior subordinated debt securities is not a business day, then
payment of the interest payable on that date will be made on the succeeding day
that is a business day, and without any interest or other payment in respect of
any delay. However, if that business day is in the succeeding calendar year,
then the payment shall be made on the preceding business day, in each case with
the same force and effect as if made on that date.

      Option to defer interest payments

         KeySpan can defer interest payments for up to five years. However, no
deferral period may extend beyond the maturity of the junior subordinated debt
securities. At the end of the deferral period, KeySpan will pay all interest
then accrued and unpaid.

         During any deferral period, neither KeySpan nor any of its subsidiaries
will be permitted to:

          -    pay a dividend or make any other payment or  distribution  on its
               capital stock;

          -    redeem,  purchase  or make a  liquidation  payment  on any of its
               capital stock;

          -    make  an  interest,  principal  or  premium  payment,  or  repay,
               repurchase or redeem,  any of its debt securities that rank equal
               with or junior to the junior subordinated debt securities; or

          -    make any  guarantee  payment  with  respect to any  guarantee  by
               KeySpan of debt  securities  of any of its  subsidiaries,  if the
               guarantee  ranks  equal to or junior to the  junior  subordinated
               debt securities.

         During any deferral period, however, KeySpan will be permitted to:

          -    pay dividends or  distributions  by way of issuance of its common
               stock;

          -    make payments under the guarantee in respect of the preferred and
               common securities; o declare or pay a dividend in connection with
               any shareholders' rights plan, or the issuing of stock under such
               a plan or repurchase those rights; and

          -    purchase  common stock relating to the issuing of common stock or
               rights under any of its benefit plans.

         KeySpan has no present intention of exercising its right to defer
payments of interest by extending the interest payment period on the junior
subordinated debt securities.

         If the property trustee is the sole holder of the junior subordinated
debt securities, KeySpan will give the regular trustees and the property trustee
notice of its election to defer interest payments one business day prior to the
earlier of:

          -    the date distributions on the trust preferred securities would be
               payable, if not for the deferral period, or

          -    the date the regular  trustees are required to give notice to the
               NYSE  or  other  applicable  self-regulatory  organization  or to
               holders of the trust  preferred  securities of the record date or
               the  date  the  distribution  would  be  payable,  if not for the
               deferral period,

but in any event one business day prior to such record date. The regular
trustees will give notice of KeySpan's selection of the deferral period to the
holders of the trust preferred securities.

         If the property trustee is not the sole holder of the junior
subordinated debt securities, KeySpan shall give the holders of the junior
subordinated debt securities notice of its election to defer interest payments
ten business days prior to the earlier of:

          -    the next succeeding interest payment date or

          -    the date upon which  KeySpan is  required  to give  notice to the
               NYSE  or  other  applicable  self-regulatory  organization  or to
               holders of the junior  subordinated debt securities of the record
               or payment date of such related interest payment,

but in any event two business days prior to the record date.

      Indenture events of default

         If any indenture event of default shall occur and be continuing, the
property trustee, as the holder of the junior subordinated debt securities, will
have the right to declare the principal of and the interest on the junior
subordinated debt securities and any other amounts payable under the indenture
to be immediately due and payable. An indenture event of default also
constitutes a trust enforcement event. The holders of trust preferred securities
in limited circumstances have the right to direct the property trustee to
exercise its rights as the holder of the junior subordinated debt securities.
See "Description of the trust preferred securities?Trust enforcement events" and
"?Voting rights." (section 7.6)

         Despite the foregoing, if a trust enforcement event has occurred and is
continuing and that event is attributable to KeySpan's failure to pay interest
or principal on the junior subordinated debt securities when interest or
principal is payable, KeySpan acknowledges that, in that event, a holder of
trust preferred securities may sue for payment. KeySpan may not amend the
indenture to remove this right to bring a direct action without the prior
written consent of all of the holders of trust preferred securities.

      Miscellaneous

         The indenture provides that KeySpan will pay all fees and expenses
related to:

          -    the issuance and exchange of the trust  securities and the junior
               subordinated debt securities;

          -    the organization, maintenance and dissolution of the trust;

          -    the retention of the trustees; and

          -    the  enforcement  by the  property  trustee  of the rights of the
               holders of the trust preferred securities.

Description of the guarantee

         The guarantee to be executed and delivered by KeySpan for the benefit
of the holders of trust preferred securities will be qualified as an indenture
under the Trust Indenture Act of 1939. The Chase Manhattan Bank will act as
guarantee trustee for purposes of the Trust Indenture Act. The terms of the
guarantee will include those set forth in the guarantee and those made part of
the guarantee by the Trust Indenture Act. The guarantee will be filed as an
exhibit to a document incorporated by reference in the registration statement of
which this prospectus forms a part.

         The following briefly summarizes the material provisions of the
guarantee. You should also read the particular terms of a guarantee, which will
be described in more detail in the applicable prospectus supplement. The
prospectus supplement will also state whether any of the generalized provisions
summarized below do not apply, or additional provisions apply, to the trust
preferred securities being offered. Wherever particular sections or defined
terms of the guarantee are referred to, those sections or defined terms are
incorporated into this prospectus by reference, and the statement in this
prospectus is qualified by their reference.

      General

         Under, and to the extent set forth in, the guarantee, KeySpan will
irrevocably and unconditionally agree to pay in full to the holders of the trust
preferred securities, as and when due, regardless of any defense, right of
set-off or counterclaim which the trust may have or assert, the following
payments without duplication:

          -    any accrued and unpaid distributions that are required to be paid
               on the trust  preferred  securities,  to the extent the trust has
               funds available for distributions;

          -    the redemption price per trust preferred security,  to the extent
               the trust has funds available for redemptions; and

          -    upon  a  voluntary  or  involuntary  dissolution,  winding-up  or
               liquidation  of the  trust,  other  than in  connection  with the
               distribution  of  junior  subordinated  debt  securities  to  the
               holders of trust preferred securities, the lesser of:

          -    the  aggregate   liquidation   amount  of  the  trust   preferred
               securities and all accrued and unpaid distributions thereon, or

          -    the amount of assets of the trust  remaining for  distribution to
               holders of the trust  preferred  securities upon a liquidation of
               the trust. (section 5.1)

      Status of the guarantee

         The guarantee will constitute an unsecured obligation of KeySpan and
will rank:

          -    subordinate  and junior in right of  payment to all of  KeySpan's
               other liabilities,

          -    on a parity with the most senior  preferred or  preference  stock
               now or hereafter  issued by KeySpan and with any guarantee now or
               hereafter  entered  into  by  KeySpan  in  respect  of any  trust
               preferred securities of any of its affiliates, and

          -    senior to KeySpan common stock. (section 6.2)

         The guarantee will not place a limitation on the amount of additional
senior debt that KeySpan may incur.

         The guarantee will constitute a guarantee of payment and not of
collection -- that is, the guaranteed party may institute a legal proceeding
directly against KeySpan to enforce its rights under the guarantee without first
instituting a legal proceeding against any other person or entity. (section 5.5)
The guarantee will not be discharged except by payment of the guarantee payments
in full to the extent not paid by the trust or upon distribution of the junior
subordinated debt securities to the holders of the trust preferred securities in
exchange for all their trust preferred securities. (section 7.1)

         The guarantee, when taken together with KeySpan's obligations under the
junior subordinated debt securities, the indenture and the declaration,
including KeySpan's obligations to pay costs, expenses, debts and liabilities of
the trust, other than those relating to trust securities, will provide a full
and unconditional guarantee on a subordinated basis by KeySpan of payments due
on the trust preferred securities. See "Effect of obligations under the junior
subordinated debt securities and the guarantee."

      Important covenants

         In the guarantee, KeySpan will covenant that, so long as any trust
securities remain outstanding, if:

          -    there  shall  have  occurred  any  event  of  default  under  the
               indenture,

          -    KeySpan  shall be in default  with  respect to its payment of any
               obligations under the guarantee, or

          -    KeySpan shall have given notice of its election to defer interest
               payments  and shall not have  rescinded  that  notice,  and while
               interest is deferred,

then KeySpan will not, and will not permit any subsidiary to:

          -    declare  or pay any  dividends  or  distributions  on, or redeem,
               purchase,  acquire or make a liquidation payment with respect to,
               any of its capital stock, or

          -    make any payment of principal, interest or premium, if any, on or
               repay,  repurchase or redeem any of its debt securities that rank
               on a parity with or junior in interest to the junior subordinated
               debt  securities or make any  guarantee  payments with respect to
               any  guarantee  by KeySpan of the debt  securities  of any of its
               subsidiaries if the guarantee ranks on a parity with or junior in
               interest to the junior subordinated debt securities, other than:

          -    dividends or distributions in common stock of KeySpan,

          -    payments  under the  guarantee  made by KeySpan in respect of the
               trust securities of the trust,

          -    any   declaration   of  a  dividend   in   connection   with  the
               implementation of a shareholders' rights plan, or the issuance of
               stock under any rights plan in the future,  or the  redemption or
               repurchase of any rights under a rights plan, and

          -    purchases of common stock related to the issuance of common stock
               or rights under any of its benefit plans. (section 6.1)

      Events of default

         An event of default under the guarantee will occur upon KeySpan's
failure to perform any of its payment or other obligations required by the
guarantee. The holders of a majority in aggregate liquidation amount of the
trust preferred securities have the right to direct the time, method and place
of conducting any proceeding for any remedy available to the guarantee trustee
in respect of the guarantee or to direct the exercise of any trust or power
conferred upon the guarantee trustee under the guarantee.

         If the guarantee trustee fails to enforce its rights under the
guarantee, any holder of related trust preferred securities may directly sue
KeySpan to enforce the guarantee trustee's rights under the guarantee without
first suing the trust, the guarantee trustee or any other person or entity.
(section 5.4)

         KeySpan, as guarantor, will be required to file annually with the
guarantee trustee a certificate as to whether or not it is in compliance with
all the conditions and covenants applicable to it under the guarantee.
(section 2.4)

      Modification of guarantee; assignment

         The guarantee may be amended only with the prior approval of the
holders of not less than 66 2/3% in aggregate liquidation amount of the
outstanding trust preferred securities and common securities. No vote will be
required, however, for any changes that do not materially adversely affect the
rights of holders of the securities. All guarantees and agreements contained in
the guarantee shall bind KeySpan's successors, assignees, receivers, trustees
and representatives and shall inure to the benefit of the holders of the trust
preferred securities then outstanding. (section 9.2)

      Information concerning the guarantee trustee

         Prior to the occurrence of a default relating to the guarantee, the
guarantee trustee undertakes to perform only the duties as are specifically set
forth in the guarantee. After a default, the guarantee trustee will exercise the
same degree of care as a prudent individual would exercise in the conduct of his
or her own affairs. Provided that the foregoing requirements have been met, the
guarantee trustee is under no obligation to exercise any of the powers vested in
it by the guarantee at the request of any holder of trust preferred securities
unless it is offered reasonable indemnity against the costs, expenses and
liabilities that might be incurred in doing so. (section 3.1)

      Termination of the guarantee

         The guarantee will terminate as to the trust preferred securities upon
full payment of the redemption price of all trust preferred securities, upon
distribution of the junior subordinated debt securities to the holders of the
trust preferred securities or upon full payment of the amounts payable upon
liquidation of the trust. The guarantee will continue to be effective or will be
reinstated, as the case may be, if at any time any holder of trust preferred
securities must restore payment of any sums paid under the trust preferred
securities or the guarantee. (section 7.1)

      Governing law

     The guarantee will be governed by and construed in accordance with the laws
of New York. (section 9.5)

Effect of  obligations  under the junior  subordinated  debt  securities and the
guarantee

         The sole purpose of the trust is to issue the trust securities in
exchange for KeySpan's junior subordinated debt securities. As long as payments
of interest and other payments are made when due on the junior subordinated debt
securities, those payments will be sufficient to cover the distributions and
payments due on the trust securities. This is due to the following factors:

          -    the  aggregate  principal  amount  of  junior  subordinated  debt
               securities  will  be  equal  to the sum of the  aggregate  stated
               liquidation amount of the trust securities;

          -    the interest rate and the interest and other payment dates on the
               junior  subordinated  debt securities will match the distribution
               rate and  distribution  and  other  payment  dates  for the trust
               preferred securities;

          -    under the indenture,  KeySpan will pay, and the trust will not be
               obligated to pay, directly or indirectly, all costs, expenses and
               obligations  of the trust other than those  relating to the trust
               securities; and

          -    the declaration  further provides that the trustees may not cause
               or  permit  the  trust  to  engage  in any  activity  that is not
               consistent with the purposes of the trust.

         Payments of distributions, to the extent there are available funds, and
other payments due on the trust preferred securities, to the extent there are
available funds, are guaranteed by KeySpan to the extent described in this
prospectus. If KeySpan does not make interest payments on the junior
subordinated debt securities, the trust will not have sufficient funds to pay
distributions on the trust preferred securities. The guarantee is a subordinated
guarantee in relation to the trust preferred securities. The guarantee does not
apply to any payment of distributions unless and until the trust has sufficient
funds for the payment of those distributions.
See "Description of the guarantee."

         The guarantee covers the payment of distributions and other payments on
the trust preferred securities only if and to the extent that KeySpan has made a
payment of interest or principal or other payments on the junior subordinated
debt securities. The guarantee, when taken together with KeySpan's obligations
under the junior subordinated debt securities and the indenture and its
obligations under the declaration, will provide a full and unconditional
guarantee of distributions and all other amounts due on the trust preferred
securities.

         KeySpan acknowledges that the guarantee trustee shall enforce the
guarantee on behalf of the holders of the trust preferred securities. If KeySpan
fails to make payments under the guarantee, the guarantee allows the holders of
the trust preferred securities to direct the guarantee trustee to enforce its
rights under the guarantee. If the guarantee trustee fails to enforce the
guarantee, any holder of trust preferred securities may directly sue KeySpan to
enforce the guarantee trustee's rights under the guarantee. Holders do not need
to first sue the trust, the guarantee trustee, or any other person or entity. A
holder of trust preferred securities may also directly sue KeySpan to enforce
its right to receive payment under the guarantee. Holders do not first need to:

          -    direct  the  guarantee  trustee  to  enforce  the  terms  of  the
               guarantee; or

          -    sue the trust or any other person or entity. (guarantee,  section
               5.4)









                           DESCRIPTION OF COMMON STOCK


General

         KeySpan's certificate of incorporation presently authorizes the
issuance of 450,000,000 shares of common stock, par value $0.01 per share. As of
March 31, 2001, there were 137,251,386 shares of common stock outstanding. As of
such date, KeySpan had 80,729 shareholders of record. The outstanding shares of
common stock are, and the additional shares of common stock that may be offered
hereby upon issuance will be, fully paid and nonassessable.

         The following briefly summarizes material provisions of KeySpan's
common stock, KeySpan's certificate of incorporation and the related rights
agreement and anti-takeover provisions of New York law.

Dividends

         The holders of KeySpan common stock are entitled to dividends and other
distributions out of assets legally available at such times and in such amounts
as KeySpan's directors may determine from time to time. Although KeySpan
contemplates the payment of dividends, the payment of future dividends is
dependent upon, among other factors, action by its board of directors, its
financial condition, future earnings and the availability of cash.

Dividend limitations

         No dividends may be declared on common stock unless all cumulative
dividends on outstanding preferred stock have been paid or declared and set
apart for payment.

Voting rights

         Each share of common stock is entitled to one vote on all matters to be
voted on by shareholders. Ordinarily, the holders of KeySpan common stock have
sole voting power to elect KeySpan's directors; however, holders of KeySpan
preferred stock could have the power to elect directors. KeySpan's certificate
of incorporation provides 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 series having voting
rights shall have multiple votes per share. The common stock does not have
cumulative voting rights.

Preemptive rights

         Holders of KeySpan common stock do not have preemptive rights to
purchase additional shares of common stock or securities convertible into shares
of common stock.

Liquidation rights

         In the event of liquidation, the holders of KeySpan common stock are
entitled to all assets that remain after satisfaction of creditors and the
liquidation preferences of outstanding preferred stock.

         The number, designation, relative rights, preferences and limitations
of the shares of the preferred stock, and of KeySpan common stock, are stated in
full in its certificate of incorporation.

Anti-takeover effects of provisions of New York law and KeySpan's certificate of
incorporation

         Certain provisions of New York law and KeySpan's certificate of
incorporation could make more difficult or delay the acquisition of KeySpan by
means of a tender offer, a proxy contest or otherwise and the removal of
incumbent directors. These provisions are intended to discourage certain types
of coercive takeover practices and inadequate takeover bids, even though such a
transaction may offer KeySpan's shareholders the opportunity to sell their stock
at a price above the prevailing market price. KeySpan's board of directors
believes that these provisions are appropriate to protect the interests of
KeySpan and of its shareholders.

      New York anti-takeover statute

         KeySpan is subject to the business combination provisions of Section
912 of the New York Business Corporation Law and expects to continue to be so
subject if and for so long as it has a class of securities registered under
Section 12 of the Securities Exchange Act of 1934, as amended. Section 912
provides, with specified exceptions, that a New York corporation may not engage
in a business combination, such as a merger, consolidation, recapitalization or
disposition of stock, with any "interested shareholder" for a period of five
years from the date that person first became an interested shareholder unless:

          -    the  transaction  resulting  in a person  becoming an  interested
               shareholder  was  approved  by  the  board  of  directors  of the
               corporation   prior  to  that  person   becoming  an   interested
               shareholder;

          -    the business combination is approved by the holders of a majority
               of the  outstanding  voting  stock not  beneficially  owned by an
               interested shareholder;

          -    the  business   combination  is  approved  by  the  disinterested
               shareholders at a meeting called no earlier than five years after
               the  date  that  the  interested   shareholder  first  became  an
               interested shareholder; or

          -    the business combination meets certain valuation requirements for
               the capital stock of the New York corporation.

         An interested shareholder is defined as any person that is the
beneficial owner of 20% or more of the outstanding voting stock of a New York
corporation or is an affiliate or associate of the corporation that at any time
during the prior five years was the beneficial owner, directly or indirectly, of
20% or more of the then outstanding voting stock. A business combination
includes mergers, asset sales and other transactions resulting in a financial
benefit to the interested shareholder.

         This statute could prohibit or delay the accomplishment of mergers,
tender offers or other takeover or change in control attempts with respect to
KeySpan and, accordingly, may discourage attempts to acquire it.

      "Anti-Greenmail"

         KeySpan is subject to Section 513 of New York's Business Corporation
Law, which provides that no domestic corporation may purchase or agree to
purchase more than 10% of its stock from a shareholder who has held the shares
for less than two years at any price that is higher than the market price unless
the transaction is approved by both the corporation's board of directors and a
majority of the votes of all outstanding shares entitled to vote thereon at a
meeting of shareholders, unless the certificate of incorporation requires a
greater percentage or the corporation offers to purchase shares from all the
holders on the same terms. KeySpan's certificate of incorporation does not
currently provide for a higher percentage.

      No shareholder action by written consent

         KeySpan's certificate of incorporation eliminates the ability of
shareholders to act by written consent. It further provides that special
meetings of KeySpan shareholders may be called only by its board of directors.

     Advance  notice   requirements  for  shareholder   proposals  and  director
     nominations

         KeySpan's by-laws include advance notice and informational requirements
and time limitations on any director nomination or any new proposal that a
shareholder wishes to make at an annual meeting of shareholders. In general, a
shareholder's notice of a director nomination or proposal will be timely if
delivered to the secretary of KeySpan at its principal executive offices not
less than 60 days nor more than 90 days prior to the scheduled date of the
annual meeting. These provisions may preclude shareholders from bringing matters
before an annual meeting or from making nominations for directors at these
meetings.

      Director vacancies and removal

         KeySpan's certificate of incorporation provides that vacancies in its
board of directors may be filled only by the affirmative vote of a majority of
the remaining directors. The certificate of incorporation also provides that
directors may be removed from office only with cause and only by the affirmative
vote of holders of a majority of the shares then entitled to vote at an election
of directors.

Rights agreement

         Under a rights agreement, each share of KeySpan common stock has
associated with it one preferred stock purchase right. Each of these rights
entitles its holder to purchase, at a purchase price of $95, subject to
adjustment, "units" of one one-hundredth of a share of Series D preferred stock
under circumstances provided for in the rights agreement.

         The purpose of the rights agreement is to:

               -    give  KeySpan's   board  of  directors  the  opportunity  to
                    negotiate  with any  persons  seeking  to obtain  control of
                    KeySpan;

               -    deter  acquisitions  of voting  control of  KeySpan  without
                    assurance  of  fair  and  equal  treatment  of  all  KeySpan
                    shareholders; and

               -    prevent a person from  acquiring  in the market a sufficient
                    amount of KeySpan  voting power to be in a position to block
                    an action sought to be taken by KeySpan's shareholders.

The exercise of the rights would cause substantial dilution to a person
attempting to acquire KeySpan on terms not approved by its board of directors
and therefore would significantly increase the price that person would have to
pay to complete the acquisition. The rights agreement may deter a potential
acquisition or tender offer.

         Until a "distribution date" occurs, the rights will:

               -    not be exercisable;

               -    be represented by the same  certificate  that represents the
                    shares with which the rights are associated; and

               -    trade together with those shares.

The rights will expire at the close of business on March 30, 2009, unless
earlier redeemed or exchanged by KeySpan.

         Following a "distribution date," the rights would become exercisable
and KeySpan would issue separate certificates representing the rights, which
would trade separately from the shares of KeySpan common stock.

         A "distribution date" would occur upon the earlier of:

               -    ten  business  days  after a  public  announcement  that the
                    person has become an "acquiring person"; or

               -    ten business days after a person  commences or announces its
                    intention  to commence a tender or exchange  offer that,  if
                    successful,   would   result  in  the  person   becoming  an
                    "acquiring person."

         Under the rights agreement, a person becomes an "acquiring person" if
the person, alone or together with a group, acquires beneficial ownership of 20%
or more of the outstanding shares of KeySpan common stock. However, an
"acquiring person" shall not include KeySpan, any of its subsidiaries, any of
its employee benefit plans or any person or entity acting pursuant to such
employee benefit plans. The rights agreement also contains provisions designed
to prevent the inadvertent triggering of the rights by institutional or certain
other shareholders.

         If any person becomes an acquiring person, each holder of a right,
other than the acquiring person, will be entitled to purchase, at the purchase
price, a number of KeySpan common stock having a market value two times the
purchase price. If, following a public announcement that a person has become an
acquiring person:

               -    KeySpan   merges  or  enters  into  any   similar   business
                    combination  transaction  and  KeySpan is not the  surviving
                    corporation; or

               -    50% or more of KeySpan's assets,  cash flow or earning power
                    is sold or transferred,

each holder of a right, other than the acquiring person, will be entitled to
purchase a number of shares of common stock of the surviving entity having a
market value two times the purchase price.

         After a person becomes an acquiring person, but prior to that person
acquiring 50% of KeySpan common stock, KeySpan's board of directors may exchange
the rights, other than rights owned by the acquiring person, at an exchange
ratio of one share of common stock, or one one-hundredth of a share of Class D
Preferred Stock, or of a share of KeySpan's preferred stock having equivalent
rights, preferences and privileges, for each right.

         At any time until the tenth business day following a public
announcement that a person has become an acquiring person, KeySpan's board of
directors may redeem all of the rights at a redemption price of $.01 per right.
On the redemption date, the rights will expire and the only entitlement of the
holders of rights will be to receive the redemption price.

         A holder of rights will not, as such, have any rights as a shareholder
of KeySpan, including rights to vote or receive dividends.

         At any time prior to the distribution date, KeySpan's board of
directors may amend any provisions in the rights agreement. After the
distribution date, the board of directors may amend the provisions of the rights
agreement in order to:

               -    cure any ambiguity;

               -    shorten  or  lengthen  any  time  period  under  the  rights
                    agreement; or

               -    make changes that will not adversely affect the interests of
                    the holders of rights;

provided, that no amendment may be made when the rights are not redeemable.

         The distribution of the rights will not be taxable to KeySpan or its
shareholders. A shareholder may recognize taxable income when the rights become
exercisable for common stock of KeySpan or an acquiring company.

Limitations of liability and indemnification matters

         As permitted by the New York Business Corporation Law, KeySpan's
certificate of incorporation provides that a director is not personally liable
to KeySpan or its shareholders for damages for any breach of duty in his
capacity as a director unless a judgment or other final adjudication adverse to
such director establishes that:

               -    his  acts  or  omissions  were  in  bad  faith  or  involved
                    intentional misconduct or a knowing violation of law;

               -    such director  personally gained a financial profit or other
                    advantage to which he was not legally entitled; or

               -    his  acts  violated  Section  719 of the New  York  Business
                    Corporation Law.

         The provisions of KeySpan's certificate of incorporation are intended
to afford directors protection, and limit their potential liability, to the
fullest extent permitted by New York law. As a result of the inclusion of such
provisions, shareholders may be unable to recover monetary damages against
directors for actions taken by them that constitute negligence or gross
negligence or that are in violation of certain of their fiduciary duties. This
provision does not affect a director's responsibilities under any other laws,
such as the federal securities laws. In addition, KeySpan's certificate of
incorporation provides that it will indemnify its directors and officers to the
fullest extent permitted by New York law.

         KeySpan has obtained directors' and officers' insurance for its
directors and officers for specified liabilities.

Listing

         The outstanding shares of common stock are listed on the New York Stock
Exchange and the Pacific Stock Exchange and application will be made to list the
additional common stock offered under this prospectus on those exchanges.

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.

        DESCRIPTION OF STOCK PURCHASE CONTRACTS AND STOCK PURCHASE UNITS


         KeySpan may issue stock purchase contracts, including contracts
obligating holders to purchase from KeySpan, and KeySpan to sell to the holders,
a specified number of shares of common stock at a future date or dates. The
price per share of common stock and the number of shares of common stock may be
fixed at the time the stock purchase contracts are issued or may be determined
by reference to a specific formula set forth in the stock purchase contracts.
The stock purchase contracts may be issued separately or as part of units
consisting of a stock purchase contract and beneficial interests in debt
securities or preferred stock of KeySpan, trust preferred securities of a trust
or debt obligations of third parties, including U.S. treasury securities,
securing the holders' obligations to purchase the common stock under the stock
purchase contracts. The stock purchase contracts may require KeySpan to make
periodic payments to the holders of the stock purchase units or vice versa, and
these payments may be unsecured or refunded on some basis. The stock purchase
contracts may require holders to secure their obligations under those contracts
in a specified manner.

         The applicable prospectus supplement will describe the terms of the
stock purchase contracts or stock purchase units, including, if applicable,
collateral or depositary arrangements, relating to the stock purchase contracts
or stock purchase units.









                    DESCRIPTION OF WARRANTS AND WARRANT UNITS


         KeySpan may issue warrants, including debt warrants, which are warrants
to purchase debt securities, and equity warrants, which include warrants to
purchase common stock, preferred stock or depositary shares. KeySpan may issue
warrants independently of or together with any other securities, including as
part of a warrant unit, and warrants may be attached to or separate from those
securities.

         Each series of warrants will be issued under a separate warrant
agreement to be entered into between KeySpan and a warrant agent. The warrant
agent will act solely as KeySpan's agent in connection with a series of warrants
and will not assume any obligation or relationship of agency for or with holders
or beneficial owners of warrants. The following describes the general terms and
provisions of the warrants offered by this prospectus. The applicable prospectus
supplement will describe any other terms of the warrant and the applicable
warrant agreement. The warrant agreement for a particular series of warrants
will be filed as an exhibit to a document incorporated by reference in the
registration statement of which this prospectus forms a part.

         Each warrant unit will consist of a warrant under which the holder,
upon exercise, will purchase (a) a specified number of shares of common stock
and (b) any of a debt security, share of preferred stock or depositary share
relating to preferred stock.

Debt Warrants

         The applicable prospectus supplement will describe the terms of any
debt warrants, including the following:

               -    the title and aggregate number of the debt warrants;

               -    any offering price of the debt warrants;

               -    whether  the debt  warrants  are to be issued  with any debt
                    securities,  and, if so, the title,  total principal  amount
                    and terms;

               -    the number of debt warrants and debt securities that will be
                    separately transferable;

               -    any date on and after the debt warrants and debt  securities
                    will be separately transferable;

               -    the  title,  total  principal  amount,  ranking  and  terms,
                    including  subordination and conversion  provisions,  of the
                    underlying  debt  securities  that  may  be  purchased  upon
                    exercise of the debt warrants;

               -    the time or period when the debt  warrants are  exercisable,
                    the minimum or maximum  amount of debt warrants which may be
                    exercised  at any one time,  and the final date on which the
                    debt warrants may be exercised;

               -    the principal  amount of underlying debt securities that may
                    be  purchased  upon  exercise  of each debt  warrant and the
                    price,  or the manner of determining the price, at which the
                    principal amount may be purchased upon exercise;

               -    the terms of any right to redeem or call the debt warrants;

               -    any book-entry procedure information;

               -    any currency or currency  units in which the offering  price
                    and the exercise price are payable; and

               -    any other terms of the debt warrants not  inconsistent  with
                    the provisions of the debt warrant agreement.

Equity Warrants

         The applicable prospectus supplement will describe the terms of any
equity warrants, including the following:

               -    the title and aggregate number of the equity warrants;

               -    any offering price of the equity warrants;

               -    the designation  and terms of any preferred  shares that are
                    purchasable  upon  exercise  of the equity  warrants or that
                    underlie depositary shares purchasable upon this exercise;

               -    if applicable,  the  designation and terms of the securities
                    with which the equity  warrants are issued and the number of
                    the equity warrants issued with each security;

               -    if applicable,  the date from and after the equity  warrants
                    and any  securities  issued  with  them  will be  separately
                    transferable;

               -    the  number of shares of common  stock,  preferred  stock or
                    depositary  shares  purchasable  upon  exercise of an equity
                    warrant and the price;

               -    the time or period when the equity  warrants are exercisable
                    and the  final  date on which  the  equity  warrants  may be
                    exercised  and  terms  regarding  any  right of  KeySpan  to
                    accelerate this final date;

               -    if  applicable,  the minimum or maximum amount of the equity
                    warrants exercisable at any one time;

               -    any currency or currency  units in which the offering  price
                    and the exercise price are payable;

               -    any  applicable   anti-dilution  provisions  of  the  equity
                    warrants;

               -    any applicable redemption or call provisions; and

               -    any additional terms of the equity warrants not inconsistent
                    with the provisions of the equity warrant agreement.

Warrant Units

         The applicable prospectus supplement will describe the specific terms
of any warrant units.









                  UNITED STATES FEDERAL INCOME TAX CONSEQUENCES


         The following summary describes the material United States federal
income tax consequences of the purchase, ownership and disposition of debt
securities, trust preferred securities, preferred stock and common stock as of
the date of this prospectus. Except where noted, this summary deals only with
debt securities, trust preferred securities, preferred stock and common stock
purchased on original issue at their issue price and held as capital assets by
United States holders, and does not deal with special situations. For example,
this summary does not address:

               -    tax  consequences  to holders  who may be subject to special
                    tax treatment,  such as dealers in securities or currencies,
                    financial  institutions,   tax-exempt  entities,   insurance
                    companies,  traders  in  securities  that  elect  to  use  a
                    mark-to-market  method of  accounting  for their  securities
                    holdings, or persons liable for alternative minimum tax;

               -    tax consequences to persons holding debt  securities,  trust
                    preferred  securities,  preferred  stock or common  stock as
                    part of a hedging,  integrated,  conversion or  constructive
                    sale transaction or a straddle;

               -    tax   consequences   to  United   States   holders  of  debt
                    securities,  trust preferred securities,  preferred stock or
                    common  stock whose  "functional  currency"  is not the U.S.
                    dollar;

               -    alternative minimum tax consequences, if any; or

               -    any state, local or foreign tax consequences.

         The discussion below is based upon the provisions of the Internal
Revenue Code of 1986, as amended (the "Code"), and regulations, rulings and
judicial decisions as of the date of this prospectus. Those authorities may be
changed, perhaps retroactively, so as to result in United States federal income
tax consequences different from those discussed below. The discussion set forth
below also assumes that all debt securities issued under this prospectus
constitute debt for United States federal income tax purposes. If any debt
security does not constitute debt for United States federal income tax purposes,
the tax consequences of the ownership of that debt security could differ
materially from the tax consequences described herein. KeySpan will summarize
any special United States federal tax considerations relevant to a particular
issue of debt securities, trust preferred securities, preferred stock or common
stock in the applicable prospectus supplement. KeySpan will also summarize
certain federal income tax consequences, if any, applicable to any offering of
depositary shares, stock purchase contracts, stock purchase units, warrants or
warrant units in the applicable prospectus supplement.

         For the purposes of this summary, a "United States holder" means a
beneficial owner of the debt securities, trust preferred securities, preferred
stock or common stock offered in this prospectus that is:

               -    a citizen or resident of the United States;

               -    a  corporation  or  partnership  created or  organized in or
                    under  the  laws  of the  United  States  or  any  political
                    subdivision of the United States;

               -    an estate the  income of which is  subject to United  States
                    federal income taxation regardless of its source; or

               -    a trust that (x) is subject to the primary  supervision of a
                    court  within  the United  States and the  control of one or
                    more United  States  persons or (y) has a valid  election in
                    effect under applicable  United States Treasury  regulations
                    to be treated as a United States person.

         A "non-United States holder" means a beneficial owner of the debt
securities, trust preferred securities, preferred stock or common stock that is
not a United States holder.

         If a partnership holds the debt securities, trust preferred securities,
preferred stock or common stock offered in this prospectus, the tax treatment of
a partner will generally depend upon the status of the partner and the
activities of the partnership. If you are a partner of a partnership holding the
offered debt securities, trust preferred securities, preferred stock or common
stock, you should consult your tax advisors.

         If you are considering the purchase of debt securities, trust preferred
securities, preferred stock or common stock, you should consult your own tax
advisors concerning the federal income tax consequences to you and any
consequences arising under the laws of any other taxing jurisdiction.

Debt securities

      Consequences to United States holders

         The following is a summary of certain United States federal tax
consequences that will apply to you if you are a United States holder of debt
securities.

      Payments of interest

         Except as set forth below, interest on a debt security will generally
be taxable to you as ordinary income from domestic sources at the time it is
paid or accrued in accordance with your method of accounting for tax purposes.

      Original issue discount

         If you own debt securities issued with original issue discount ("OID"),
you will be subject to special tax accounting rules, as described in greater
detail below. In that case, you should be aware that you generally must include
OID in gross income in advance of the receipt of cash attributable to that
income. However, you generally will not be required to include separately in
income cash payments received on the debt securities, even if denominated as
interest, to the extent those payments do not constitute qualified stated
interest, as defined below. Notice will be given in the applicable prospectus
supplement when KeySpan determines that a particular debt security will be an
original issue discount debt security.

         A debt security with an issue price that is less than the "stated
redemption price at maturity" (the sum of all payments to be made on the debt
security other than "qualified stated interest") generally will be issued with
OID if that difference is at least 0.25% of the stated redemption price at
maturity multiplied by the number of complete years to maturity. The "issue
price" of each debt security in a particular offering will be the first price at
which a substantial amount of that particular offering is sold to the public.
The term "qualified stated interest" means stated interest that is
unconditionally payable in cash or in property, other than debt instruments of
the issuer, provided the interest to be paid meets all of the following
conditions:

               -    it is payable at least once per year;

               -    it is payable over the entire term of the debt security; and

               -    it is payable at a single fixed rate or,  subject to certain
                    conditions, based on one or more interest indices.

         KeySpan will give you notice in the applicable prospectus supplement
when it determines that a particular debt security will bear interest that is
not qualified stated interest.

         If you own a debt security issued with "de minimis" OID, which is
discount that is not OID because it is less than 0.25% of the stated redemption
price at maturity multiplied by the number of complete years to maturity, you
generally must include the de minimis OID in income at the time payments, other
than qualified stated interest, on the debt securities are made in proportion to
the amount paid. Any amount of de minimis OID that you have included in income
will be treated as capital gain.

         Certain of the debt securities may contain provisions permitting them
to be redeemed prior to their stated maturity at KeySpan's option and/or at your
option. Original issue discount debt securities containing those features may be
subject to rules that differ from the general rules discussed herein. If you are
considering the purchase of original issue discount debt securities with those
features, you should carefully examine the applicable prospectus supplement and
should consult your own tax advisors with respect to those features since the
tax consequences to you with respect to OID will depend, in part, on the
particular terms and features of the debt securities.

         If you own original issue discount debt securities with a maturity upon
issuance of more than one year you generally must include OID in income in
advance of the receipt of some or all of the related cash payments using the
"constant yield method" described in the following paragraph. This method takes
into account the compounding of interest. The accruals of OID on an original
issue discount debt security will generally be less in the early years and more
in the later years.

         The amount of OID that you must include in income if you are the
initial United States holder of an original issue discount debt security is the
sum of the "daily portions" of OID with respect to the debt security for each
day during the taxable year or portion of the taxable year in which you held
that debt security ("accrued OID"). The daily portion is determined by
allocating to each day in any "accrual period" a pro rata portion of the OID
allocable to that accrual period. The "accrual period" for an original issue
discount debt security may be of any length and may vary in length over the term
of the debt security, provided that each accrual period is no longer than one
year and each scheduled payment of principal or interest occurs on the first day
or the final day of an accrual period. The amount of OID allocable to any
accrual period is an amount equal to the excess, if any, of:

               -    the debt security's adjusted issue price at the beginning of
                    the  accrual  period  multiplied  by its yield to  maturity,
                    determined on the basis of  compounding at the close of each
                    accrual  period and properly  adjusted for the length of the
                    accrual period, over

               -    the aggregate of all qualified stated interest  allocable to
                    the accrual period.

         OID allocable to a final accrual period is the difference between the
amount payable at maturity, other than a payment of qualified stated interest,
and the adjusted issue price at the beginning of the final accrual period. The
"adjusted issue price" of a debt security at the beginning of any accrual period
is equal to its issue price increased by the accrued OID for each prior accrual
period, determined without regard to the amortization of any acquisition or bond
premium, as described below, and reduced by any payments made on the debt
security (other than qualified stated interest) on or before the first day of
the accrual period. Under these rules, you will have to include in income
increasingly greater amounts of OID in successive accrual periods. KeySpan is
required to provide information returns stating the amount of OID accrued on
debt securities held of record by persons other than corporations and other
exempt holders.

         Floating rate debt securities are subject to special OID rules. In the
case of an original issue discount debt security that is a floating rate debt
security, both the "yield to maturity" and "qualified stated interest" will be
determined solely for purposes of calculating the accrual of OID as though the
debt security will bear interest in all periods at a fixed rate generally equal
to the rate that would be applicable to interest payments on the debt security
on its date of issue or, in the case of certain floating rate debt securities,
the rate that reflects the yield to maturity that is reasonably expected for the
debt security. Additional rules may apply if

               -    the  interest on a floating  rate debt  security is based on
                    more than one interest index; or

               -    the principal  amount of the debt security is indexed in any
                    manner.

         This discussion does not address the tax rules applicable to debt
securities with an indexed principal amount. If you are considering the purchase
of floating rate original issue discount debt securities or securities with
indexed principal amounts, you should carefully examine the applicable
prospectus supplement and should consult your own tax advisors regarding the
United States federal income tax consequences to you of holding and disposing of
those debt securities.

         You may elect to treat all interest on any debt security as OID and
calculate the amount includible in gross income under the constant yield method
described above. For purposes of this election, interest includes stated
interest, acquisition discount, OID, de minimis OID, market discount, de minimis
market discount and unstated interest, as adjusted by any amortizable bond
premium or acquisition premium. You must make this election for the taxable year
in which you acquired the debt security, and you may not revoke the election
without the consent of the Internal Revenue Service (the "IRS"). You should
consult with your own tax advisors about this election.

      Short-term debt securities

         In the case of debt securities having a term of one year or less, all
payments, including all stated interest, will be included in the stated
redemption price at maturity and will not be qualified stated interest. As a
result, you will generally be taxed on the discount instead of stated interest.
The discount will be equal to the excess of the stated redemption price at
maturity over the issue price of a short-term debt security, unless you elect to
compute this discount using tax basis instead of issue price.

         In general, individual and certain other cash method United States
holders of short-term debt securities are not required to include accrued
discount in their income currently unless they elect to do so, but may be
required to include stated interest in income as the income is received. United
States holders that report income for United States federal income tax purposes
on the accrual method and certain other United States holders are required to
accrue discount on short-term debt securities (as ordinary income) on a
straight-line basis, unless an election is made to accrue the discount according
to a constant yield method based on daily compounding. If you are not required,
and do not elect, to include discount in income currently, any gain you realize
on the sale, exchange or retirement of a short-term debt security will generally
be ordinary income to you to the extent of the discount accrued by you through
the date of sale, exchange or retirement. In addition, if you do not elect to
currently include accrued discount in income you may be required to defer
deductions for a portion of your interest expense with respect to any
indebtedness attributable to the short-term debt securities.

      Market discount

         If you purchase a debt security, other than an original issue discount
debt security, for an amount that is less than its stated redemption price at
maturity, or, in the case of an original issue discount debt security, its
adjusted issue price, the amount of the difference will be treated as "market
discount" for United States federal income tax purposes, unless that difference
is less than a specified de minimis amount. Under the market discount rules, you
will be required to treat any payment, other than qualified stated interest, on,
or any gain on the sale, exchange, retirement or other disposition of, a debt
security as ordinary income to the extent of the market discount that you have
not previously included in income and are treated as having accrued on the debt
security at the time of its payment or disposition. In addition, you may be
required to defer, until the maturity of the debt security or its earlier
disposition in a taxable transaction, the deduction of all or a portion of the
interest expense on any indebtedness attributable to the debt security.

         Any market discount will be considered to accrue ratably during the
period from the date of acquisition to the maturity date of the debt security,
unless you elect to accrue on a constant interest method. You may elect to
include market discount in income currently as it accrues, on either a ratable
or constant interest method, in which case the rule described above regarding
deferral of interest deductions will not apply. Your election to include market
discount in income currently, once made, applies to all market discount
obligations acquired by you on or after the first taxable year to which your
election applies and may not be revoked without the consent of the IRS. You
should consult your own tax advisor before making this election.

      Acquisition premium, amortizable bond premium

         If you purchase an original issue discount debt security for an amount
that is greater than its adjusted issue price but equal to or less than the sum
of all amounts payable on the debt security after the purchase date other than
payments of qualified stated interest, you will be considered to have purchased
that debt security at an "acquisition premium." Under the acquisition premium
rules, the amount of OID that you must include in gross income with respect to
the debt security for any taxable year will be reduced by the portion of the
acquisition premium properly allocable to that year.

         If you purchase a debt security (including an original issue discount
debt security) for an amount in excess of the sum of all amounts payable on the
debt security after the purchase date other than qualified stated interest, you
will be considered to have purchased the debt security at a "premium" and, if it
is an original issue discount debt security, you will not be required to include
any OID in income. You generally may elect to amortize the premium over the
remaining term of the debt security on a constant yield method as an offset to
interest when includible in income under your regular accounting method. In the
case of instruments that provide for alternative payment schedules, bond premium
is calculated by assuming that (a) you will exercise or not exercise options in
a manner that maximizes your yield, and (b) KeySpan will exercise or not
exercise options in a manner that minimizes your yield (except that KeySpan will
be assumed to exercise call options in a manner that maximizes your yield). If
you do not elect to amortize bond premium, that premium will decrease the gain
or increase the loss you would otherwise recognize on disposition of the debt
security. Your election to amortize premium on a constant yield method will also
apply to all debt obligations held or subsequently acquired by you on or after
the first day of the first taxable year to which the election applies. You may
not revoke the election without the consent of the IRS. You should consult your
own tax advisor before making this election.

      Sale, exchange and retirement of debt securities

         Your tax basis in a debt security will, in general, be your cost for
that debt security, increased by OID, market discount or any discount with
respect to a short-term debt security that you previously included in income,
and reduced by any amortized premium and any cash payments on the debt security
other than qualified stated interest. Upon the sale, exchange, retirement or
other disposition of a debt security, you will recognize gain or loss equal to
the difference between the amount you realize upon the sale, exchange,
retirement or other disposition (less an amount equal to any accrued qualified
stated interest that you did not previously include in income, which will be
taxable as interest income) and the adjusted tax basis of the debt security.
Except as described above with respect to certain short-term debt securities or
with respect to market discount, or as described below with respect to foreign
currency debt securities or with respect to contingent payment debt securities,
that gain or loss will be capital gain or loss. Capital gains of individuals
derived in respect of capital assets held for more than one year are eligible
for reduced rates of taxation. The deductibility of capital losses is subject to
limitations.

     Extendible  debt  securities,  renewable  debt  securities  and reset  debt
     securities

         If so specified in an applicable prospectus supplement relating to a
debt security, KeySpan may have the option to extend the maturity of a debt
security. In addition, KeySpan may have the option to reset the interest rate,
the spread or the spread multiplier.

         The United States federal income tax treatment of a debt security with
respect to which such an option has been exercised is unclear and will depend,
in part, on the terms established for such debt securities by KeySpan pursuant
to the exercise of the option. You may be treated for federal income tax
purposes as having exchanged your debt securities for new debt securities with
revised terms. If this is the case, you would realize gain or loss equal to the
difference between the issue price of the new debt securities and your tax basis
in the old debt securities, which would be recognized subject to certain
possible exceptions. Furthermore, the new debt securities might be subject to
withholding, backup withholding and/or information reporting and might be deemed
to be issued with OID.

         Even though federal income tax on the deemed exchange may be imposed on
you, you would not receive any cash until the maturity or an earlier redemption
of the new debt securities, except for any current interest payments.

         If the exercise of the option is not treated as an exchange of old debt
securities for new debt securities, you will not recognize gain or loss as a
result of such exchange.

         The presence of these options may also affect the calculation of OID,
among other things. Solely for purposes of the accrual of OID, if KeySpan issues
a debt security and has an option or combination of options to extend the term
of the debt security, KeySpan will be presumed to exercise such option or
options in a manner that minimizes the yield on the debt security. Conversely,
if you are treated as having a put option, such an option will be presumed to be
exercised in a manner that maximizes the yield on the debt security. If KeySpan
exercises such option or options to extend the term of the debt security, or
your option to put does not occur (contrary to the assumptions made), then
solely for purposes of the accrual of OID, the debt security will be treated as
reissued on the date of the change in circumstances for an amount equal to its
adjusted issue price on the date.

         You should carefully examine the applicable prospectus supplement and
should consult your own tax advisor regarding the United States federal income
tax consequences of the holding and disposition of such debt securities.

      Foreign currency debt securities

         Payments of interest

         If you receive interest payments made in a foreign currency and you use
the cash basis method of accounting, you will be required to include in income
the U.S. dollar value of the amount received, determined by translating the
foreign currency received at the "spot rate" for such foreign currency on the
date such payment is received regardless of whether the payment is in fact
converted into U.S. dollars. You will not recognize exchange gain or loss with
respect to the receipt of such payment.

         If you use the accrual method of accounting, you may determine the
amount of income recognized with respect to such interest in accordance with
either of two methods. Under the first method, you will be required to include
in income for each taxable year the U.S. dollar value of the interest that has
accrued during such year, determined by translating such interest at the average
rate of exchange for the period or periods during which such interest accrued.
Under the second method, you may elect to translate interest income at the spot
rate on:

               -    the last day of the accrual period;

               -    the  last  day of the  taxable  year if the  accrual  period
                    straddles your taxable year; or

               -    the date the  interest  payment is  received if such date is
                    within five days of the end of the accrual period.

         Upon receipt of an interest payment on such debt security (including,
upon the sale of such debt security, the receipt of proceeds which include
amounts attributable to accrued interest previously included in income), you
will recognize ordinary gain or loss in an amount equal to the difference
between the U.S. dollar value of such payment (determined by translating the
foreign currency received at the "spot rate" for such foreign currency on the
date such payment is received) and the U.S. dollar value of the interest income
you previously included in income with respect to such payment.

         Original issue discount

         OID on a debt security that is also a foreign currency debt security
will be determined for any accrual period in the applicable foreign currency and
then translated into U.S. dollars, in the same manner as interest income accrued
by a holder on the accrual basis, as described above. You will recognize
exchange gain or loss when OID is paid (including, upon the sale of such debt
security, the receipt of proceeds which include amounts attributable to OID
previously included in income) to the extent of the difference between the U.S.
dollar value of such payment (determined by translating the foreign currency
received at the "spot rate" for such foreign currency on the date such payment
is received) and the U.S. dollar value of the accrued OID (determined in the
same manner as for accrued interest). For these purposes, all receipts on a debt
security will be viewed:

               -    first, as the receipt of any stated interest  payment called
                    for under the terms of the debt security;

               -    second, as receipts of previously accrued OID (to the extent
                    thereof),  with  payments  considered  made for the earliest
                    accrual periods first; and

               -    third, as the receipt of principal.

         Market discount and bond premium

         The amount of market discount on foreign currency debt securities
includible in income will generally be determined by translating the market
discount determined in the foreign currency into U.S. dollars at the spot rate
on the date the foreign currency debt security is retired or otherwise disposed
of. If you have elected to accrue market discount currently, then the amount
which accrues is determined in the foreign currency and then translated into
U.S. dollars on the basis of the average exchange rate in effect during such
accrual period. You will recognize exchange gain or loss with respect to market
discount which is accrued currently using the approach applicable to the accrual
of interest income as described above.

         Bond premium on a foreign currency debt security will be computed in
the applicable foreign currency. If you have elected to amortize the premium,
the amortizable bond premium will reduce interest income in the applicable
foreign currency. At the time bond premium is amortized, exchange gain or loss,
which is generally ordinary gain or loss, will be realized based on the
difference between spot rates at such time and the time of acquisition of the
foreign currency debt security.

         If you elect not to amortize bond premium, you must translate the bond
premium computed in the foreign currency into U.S. dollars at the spot rate on
the maturity date and such bond premium will constitute a capital loss which may
be offset or eliminated by exchange gain.

         Sale, exchange or retirement

         Your tax basis in a foreign currency debt security will be the U.S.
dollar value of the foreign currency amount paid for such foreign currency debt
security determined at the time of your purchase. If you purchased the foreign
currency debt security with previously owned foreign currency, you will
recognize exchange gain or loss at the time of the purchase attributable to the
difference at the time of purchase, if any, between the fair market value of the
debt security in U.S. dollars on the date of purchase and your tax basis in the
foreign currency. Such gain or loss will be ordinary income or loss.

         For purposes of determining the amount of any gain or loss you
recognize on the sale, exchange, retirement or other disposition of a foreign
currency debt security, the amount realized on such sale, exchange, retirement
or other disposition will be the U.S. dollar value of the amount realized in
foreign currency (other than amounts attributable to accrued but unpaid interest
not previously included in your income which will be taxable as interest
income), determined at the time of the sale, exchange, retirement or other
disposition.

         You may also recognize exchange gain or loss attributable to the
movement in exchange rates between the time of purchase and the time of
disposition (including the sale, exchange, retirement or other disposition) of a
foreign currency debt security. Such gain or loss will be treated as ordinary
income or loss. The realization of such gain or loss will be limited to the
amount of overall gain or loss realized on the disposition of a foreign currency
debt security.

         If a foreign currency debt security is denominated in one of certain
hyperinflationary currencies, generally:

               -    exchange  gain or loss  would be  realized  with  respect to
                    movements in the exchange rate between the beginning and end
                    of each  taxable  year (or  such  shorter  period)  the debt
                    security was held, and

               -    such  exchange  gain or loss would be treated as an addition
                    or offset, respectively,  to the accrued interest income on,
                    and an  adjustment to the holder's tax basis in, the foreign
                    currency debt security.

         Your tax basis in foreign currency received as interest on (or OID with
respect to), or received on the sale, exchange, retirement or other disposition
of, a foreign currency debt security will be the U.S. dollar value thereof at
the spot rate at the time you receive such foreign currency. Any gain or loss
recognized by you on a sale, exchange or other disposition of foreign currency
will be ordinary income or loss and will not be treated as interest income or
expense, except to the extent provided in Treasury regulations or administrative
pronouncements of the IRS.

         Dual currency debt securities

         If so specified in an applicable prospectus supplement relating to a
foreign currency debt security, KeySpan may have the option to make all payments
of principal and interest scheduled after the exercise of such option in a
currency other than the specified currency. The United States federal income tax
treatment of dual currency debt securities is uncertain. Treasury regulations
currently in effect do not address the tax treatment of dual currency debt
securities.

         An IRS announcement states that the IRS is considering issuing proposed
regulations that would:

               -    apply the  principles  contained  in  regulations  governing
                    contingent  debt  instruments  to dual currency notes in the
                    "predominant currency" of the dual currency notes and

               -    apply the rules  discussed  above  with  respect  to foreign
                    currency notes with OID for the  translation of interest and
                    principal into U.S. dollars.

         The IRS states that these concepts are still under consideration.
Persons considering the purchase of dual currency notes should carefully examine
the applicable prospectus supplement and should consult their own tax advisors
regarding the United States federal income tax consequences of the holding and
disposition of such notes.

         If KeySpan exercises such an option, you may be considered to have
exchanged your debt security denominated in the specified currency for a debt
security denominated in the optional payment currency. If the exercise is
treated as a taxable exchange, you will recognize gain or loss, if any, equal to
the difference between your basis in the debt security denominated in the
specified currency and the value of the debt security denominated in the
optional payment currency. If the exercise of the option is not treated as an
exchange, you will not recognize gain or loss and your basis in the debt
security will be unchanged.

      Contingent payment debt securities

         The OID regulations contain special rules for determining the timing
and amount of OID to be accrued with respect to certain debt securities
providing for one or more contingent payments. Under these rules, you will
accrue OID each year based on the "comparable yield" of the debt securities. The
comparable yield of the debt securities will generally be the rate at which
KeySpan would issue a fixed rate debt instrument with terms and conditions
similar to the debt securities.

         KeySpan is required to provide the comparable yield to you and, solely
for tax purposes, is also required to provide a projected payment schedule that
includes the actual interest payments on the debt securities and estimates the
amount and timing of contingent payments on the debt securities. Pursuant to the
terms of the indenture, you will be bound by KeySpan's determination. For United
States federal income tax purposes, you must use the comparable yield and the
schedule of projected payments in determining your interest accruals, and the
adjustments thereto described below, in respect of the contingent payment debt
securities. KeySpan will give notice in the applicable prospectus supplement
when it determines that a particular debt security will be treated as contingent
debt.

         The amount of OID on a contingent payment debt security for each
accrual period is determined by multiplying the comparable yield of the
contingent payment debt security (adjusted for the length of the accrual period)
by the debt security's adjusted issue price at the beginning of the accrual
period (determined in accordance with the rules set forth in the OID regulations
relating to contingent payment debt instruments). The amount of OID so
determined will then be allocated on a ratable basis to each day in the accrual
period that you hold the contingent payment debt security.

         If the actual payments made on the contingent payment debt securities
in a taxable year differ from the projected contingent payments, adjustments
will be made for such differences. A positive adjustment, for the amount by
which an actual payment exceeds a projected contingent payment, will be treated
as additional interest. A negative adjustment will:

               -    first, reduce the amount of interest required in the current
                    year;

               -    second,  any negative  adjustments that exceed the amount of
                    interest  accrued  in the  current  year will be  treated as
                    ordinary  loss  to  the  extent  that  your  total  interest
                    inclusions   exceed  the  total   amount  of  net   negative
                    adjustments treated as ordinary loss in prior taxable years;
                    and

               -    third,  any  excess  negative  adjustments  will be  carried
                    forward  to  offset  future  income or  amount  realized  on
                    disposition.

         Gain on the sale, exchange or retirement of a contingent payment debt
security generally will be treated as ordinary income. Loss from the disposition
of a contingent payment debt security will be treated as ordinary loss to the
extent of your prior net interest inclusions (reduced by the total net negative
adjustments previously allowed as an ordinary loss). Any loss in excess of such
amount will be treated as capital loss.

         For special treatment of foreign currency debt securities or dual
currency debt securities that are also contingent payment debt securities, see
the applicable prospectus supplement.

         The rules regarding contingent payment debt securities are complex. If
you are considering the purchase of debt securities providing for one or more
contingent payments, you should carefully examine the applicable prospectus
supplement and consult your own tax advisors regarding the United States federal
income tax consequences of the holding and disposition of such debt securities.

      Consequences to non-United States holders

         The following is a summary of certain United States federal income tax
consequences that will apply to you if you are a non-United States holder of
debt securities.

      United States federal withholding tax

         The 30% United States federal withholding tax will generally not apply
to any payment of principal or interest, including OID, on debt securities
provided that:

               -    you do not actually or constructively own 10% or more of the
                    total combined voting power of all classes of KeySpan voting
                    stock  within the meaning of the Code and the United  States
                    Treasury regulations;

               -    you are not a controlled foreign corporation that is related
                    to KeySpan through stock ownership;

               -    you are not a bank  whose  receipt of  interest  on the debt
                    securities is described in Section 881(c)(3)(A) of the Code;
                    and

               -    either (a) you provide  your name and address on an IRS Form
                    W-8BEN  (or  other  applicable  form),  and  certify,  under
                    penalties  of  perjury,  that  you are not a  United  States
                    person or (b) you hold your notes  through  certain  foreign
                    intermediaries,    and   you   satisfy   the   certification
                    requirements   of   applicable    United   States   Treasury
                    regulations.

         Special certification rules apply to certain non-United States holders
that are entities rather than individuals. If you cannot satisfy the
requirements described above, payments of interest, including OID, made to you
will be subject to the 30% United States federal withholding tax, unless you
provide KeySpan with a properly executed:

               -    IRS Form  W-8BEN  (or other  applicable  form)  claiming  an
                    exemption  from,  or  reduction  in,  withholding  under the
                    benefit of a tax treaty; or

               -    IRS  Form  W-8ECI  stating  that  interest  paid on the debt
                    securities is not subject to  withholding  tax because it is
                    effectively  connected  with  your  conduct  of a  trade  or
                    business  in the  United  States as  discussed  below  under
                    "United States federal income tax".

         The 30% United States federal withholding tax will generally not apply
to any gain that you realize on the sale, exchange, retirement or other
disposition of debt securities.

      United States federal income tax

         If you are engaged in a trade or business in the United States and
interest, including OID, on the debt securities is effectively connected with
the conduct of that trade or business, you will be subject to United States
federal income tax on that interest, including OID, on a net income basis
(although exempt from the 30% withholding tax) in the same manner as if you were
a United States holder. In addition, if you are a foreign corporation, you may
be subject to a branch profits tax equal to 30% (or lower applicable treaty
rate) of your earnings and profits for the taxable year, subject to adjustments.

         You will generally not be subject to United States federal income tax
on the disposition of a debt security unless:

               -    the gain is  effectively  connected  with your  conduct of a
                    trade or business in the United States; or

               -    you are an  individual  who is present in the United  States
                    for  183  days  or  more  in  the   taxable   year  of  that
                    disposition, and certain other conditions are met.

         Special rules may apply to some non-United States holders, such as
"controlled foreign corporations", "passive foreign investment companies",
"foreign personal holdings companies" and corporations that accumulate earnings
to avoid United States federal income tax, that are subject to special treatment
under the Code. These entities should consult their own tax advisors to
determine the United States federal, state, local and other tax consequences
that may be relevant to them.

      United States federal estate tax

         Your estate will not be subject to United States federal estate tax on
debt securities beneficially owned by you at the time of your death, provided
that (1) you do not own 10% or more of the total combined voting power of all
classes of KeySpan voting stock (within the meaning of the Code and United
States Treasury regulations) and (2) interest on those debt securities would not
have been, if received at the time of your death, effectively connected with the
conduct by you of a trade or business in the United States.

      Information reporting and backup withholding

      United States holders

         In general, information reporting requirements will apply to certain
payments of principal and interest, including OID, paid on debt securities and
to the proceeds of sale of a debt security made to you (unless you are an exempt
recipient such as a corporation). A 31% backup withholding tax will apply to
such payments if you fail to provide a taxpayer identification number or
certification of exempt status, or fail to report in full dividend and interest
income.

      Non-United States holders

         In general, no information reporting or backup withholding will be
required regarding payments that KeySpan makes to you provided that it does not
have actual knowledge that you are a United States person and it has received
from you the certification described above in the first sentence under
"Consequences to non-United States holders--United States federal withholding
tax."

         In addition, no information reporting or backup withholding will be
required regarding the proceeds of the sale of a debt security made within the
United States or conducted through certain United States related financial
intermediaries, if:

               -    the payor  receives the  certification  described  above and
                    does not have actual  knowledge that you are a United States
                    person; or

               -    you otherwise establish an exemption.

         Any amounts withheld under the backup withholding rules will be allowed
as a refund or a credit against your United States federal income tax liability
provided the required information is furnished to the IRS.

Trust preferred securities

      Classification of the trusts

         KeySpan intends to take the position that each trust will be classified
as a grantor trust for United States federal income tax purposes and not as an
association taxable as a corporation. As a condition to the issuance of the
junior subordinated debt securities, Simpson Thacher & Bartlett, special tax
counsel to KeySpan, will deliver an opinion that under current law and assuming
full compliance with the terms of the trust's amended and restated declaration,
and based upon certain facts and assumptions contained in such opinion, the
trust will be classified as a grantor trust for United States federal income tax
purposes. As a result, for United States federal income tax purposes, you
generally will be treated as owning an undivided beneficial ownership interest
in the junior subordinated debt securities. Thus, you will be required to
include in your gross income your pro rata share of the interest income or OID
that is paid or accrued on the junior subordinated debt securities. See
"Consequences to United States holders--Interest income and original issue
discount."

      Classification of the junior subordinated debt securities

         KeySpan, the trust and you (by your acceptance of a beneficial
ownership interest in a trust preferred security) will agree to treat the junior
subordinated debt securities as indebtedness for all United States tax purposes.
As a condition to the issuance of the junior subordinated debt securities,
Simpson Thacher & Bartlett, special tax counsel to KeySpan, will deliver an
opinion that under current law, and based upon certain facts and assumptions
contained in such opinion, the junior subordinated debt securities will be
classified as indebtedness for United States federal income tax purposes.

      Consequences to United States holders

      Interest income and original issue discount

         KeySpan anticipates that the junior subordinated debt securities will
not be issued with an issue price that is less than their stated redemption
price at maturity. In this case, subject to the discussion below, the junior
subordinated debt securities will not be subject to the special OID rules, at
least upon initial issuance, so that you will generally be taxed on the stated
interest on the junior subordinated debt securities as ordinary income at the
time it is paid or accrued in accordance with your regular method of tax
accounting.

         If, however, KeySpan exercises its right to defer payments of interest
on the junior subordinated debt securities, the junior subordinated debt
securities will become OID instruments at such time. In such case, you will be
subject to the special OID rules described below. Once the junior subordinated
debt securities become OID instruments, they will be taxed as OID instruments
for as long as they remain outstanding.

         Under the OID economic accrual rules, the following occurs:

               -    regardless of your method of accounting, you would accrue an
                    amount of interest  income each year that  approximates  the
                    stated  interest  payments called for under the terms of the
                    junior    subordinated    debt    securities    using    the
                    constant-yield-to-maturity  method of accrual  described  in
                    Section 1272 of the Code;

               -    the actual  cash  payments  of  interest  you receive on the
                    junior  subordinated  debt securities  would not be reported
                    separately as taxable income;

               -    any amount of OID included in your gross income  (whether or
                    not  during a  deferral  period)  with  respect to the trust
                    preferred  securities  would increase your tax basis in such
                    trust preferred securities; and

               -    the amount of  distributions  that you receive in respect of
                    such  accrued OID would  reduce your tax basis in such trust
                    preferred securities.

         The Treasury regulations dealing with OID and the deferral of interest
payments have not yet been addressed in any rulings or other interpretations by
the IRS. It is possible that the IRS could assert that the junior subordinated
debt securities were issued initially with OID merely because of KeySpan's right
to defer payments of interest. If the IRS were successful in this regard, you
would be subject to the special OID rules described above regardless of whether
KeySpan exercises its option to defer payments of interest on such junior
subordinated debt securities.

         If you are a corporate holder of trust preferred securities, you will
not be entitled to a dividends received deduction with respect to any income you
recognize with respect to the trust preferred securities.

      Distribution of junior subordinated debt securities or cash

         As described under the caption "Description of the trust preferred
securities--Distribution of the junior subordinated debt securities", the junior
subordinated debt securities held by the trust may be distributed to you in
exchange for your trust preferred securities when the trust is dissolved. Under
current law, except as described below, this type of distribution from a grantor
trust would not be taxable. Upon a distribution, you will receive your pro rata
share of the junior subordinated debt securities previously held indirectly
through the trust. Your holding period and aggregate tax basis in the junior
subordinated debt securities will equal the holding period and aggregate tax
basis that you had in your trust preferred securities before the distribution.
If, however, the trust would be required to pay United States federal income tax
relating to income accrued or received on the junior subordinated debt
securities, a Tax event will occur. See "Description of the trust preferred
securities--Special event redemption". If KeySpan elects to distribute the
junior subordinated debt securities to you at this time, the distribution would
be taxable to the trust and to you.

         If you receive junior subordinated debt securities in exchange for your
trust preferred securities, you would accrue interest in respect of the junior
subordinated debt securities received from the trust in the manner described
above under "--Interest income and original issue discount."

         In certain circumstances described above under the captions
"Description of the trust preferred securities--Redemption" and "Description of
trust preferred securities--Special event redemption", KeySpan may redeem the
junior subordinated debt securities, in whole or in part, and the trust will use
the cash it receives upon the redemption to redeem trust securities having an
aggregate liquidation amount equal to the aggregate principal amount of the
junior subordinated debt securities so redeemed. The distribution of cash to
holders of trust preferred securities would be taxable as described below under
"--Sales of trust preferred securities or redemption of junior subordinated
debentures."

     Sales of trust  preferred  securities or redemption of junior  subordinated
     debentures

         If you sell your trust preferred securities or receive cash upon
redemption of the junior subordinated debt securities, you will recognize gain
or loss equal to the difference between:

               -    your amount  realized on the sale or redemption of the trust
                    preferred  securities or junior subordinated debt securities
                    (less an amount  equal to any accrued  but unpaid  qualified
                    stated  interest  that  you did not  previously  include  in
                    income, which will be taxable as interest income); and

               -    your adjusted tax basis in your trust  preferred  securities
                    or junior subordinated debt securities sold or redeemed.

         Your gain or loss will be a capital gain or loss, provided that you
held the trust preferred securities or junior subordinated debt securities as a
capital asset. The gain or loss will generally be a long-term capital gain or
loss if you have held your trust preferred securities or junior subordinated
debt securities for more than one year. Long-term capital gains of individual
derived with respect to capital assets held for more than one year are currently
subject to tax at a maximum rate of 20%. The deductibility of capital losses is
subject to limitations.

      Consequences to non-United States holders

         The following discussion only applies to you if you are a non-United
States holder. As discussed above, the trust preferred securities will be
treated by the parties as evidence of undivided beneficial ownership interests
in the junior subordinated debt securities. See above under "--Classification of
the trusts". The following discussion assumes that the junior subordinated debt
securities will be treated as indebtedness for all United States tax purposes.

      United States federal withholding tax

         The 30% United States federal withholding tax will generally not apply
to any payment of principal or interest, including OID, on the trust preferred
securities (or the junior subordinated debt securities) provided that:

               -    you do not actually (or  constructively)  own 10% or more of
                    the total  combined  voting  power of all classes of KeySpan
                    voting  stock  within the meaning of the Code and the United
                    States Treasury regulations;

               -    you are not a controlled foreign corporation that is related
                    to KeySpan through stock ownership;

               -    you are not a bank whose  receipt of  interest  on the trust
                    preferred   securities  (or  the  junior  subordinated  debt
                    securities)  is  described  in Section  881(c)(3)(A)  of the
                    Code; and

               -    either (a) you provide  your name and address on an IRS Form
                    W-8BEN  (or  other  applicable  form),  and  certify,  under
                    penalties  of  perjury,  that  you are not a  United  States
                    person, or (b) you hold your trust preferred  securities (or
                    junior subordinated debt securities) through certain foreign
                    intermediaries,    and   you   satisfy   the   certification
                    requirements   of   applicable    United   States   Treasury
                    regulations.

         Special certification rules apply to certain non-United States holders
that are entities rather than individuals and to beneficial owners of interest
paid to entities in which beneficial owners are interest holders. If you cannot
satisfy the requirements described above, payments of interest, including OID,
made to you will be subject to the 30% United States federal withholding tax,
unless you provide KeySpan with a properly executed

               -    IRS Form  W-8BEN  (or other  applicable  form)  claiming  an
                    exemption  from,  or  reduction  in,  withholding  under the
                    benefit of a tax treaty; or

               -    IRS Form  W-8ECI  stating  that  interest  paid on the trust
                    preferred   securities  (or  the  junior  subordinated  debt
                    securities) is not subject to withholding  tax because it is
                    effectively  connected  with  your  conduct  of a  trade  or
                    business  in the  United  States as  discussed  below  under
                    "United States federal income tax."

         The 30% United States federal withholding tax will generally not apply
to any gain that you realize on the sale, exchange, retirement or other
disposition of trust preferred securities or junior subordinated debt
securities.

      United States federal income tax

         If you are engaged in a trade or business in the United States and
interest, including OID, on the trust preferred securities (or the junior
subordinated debt securities) is effectively connected with the conduct of that
trade or business, you will be subject to United States federal income tax on
that interest, including OID, on a net income basis (although exempt from the
30% withholding tax) in the same manner as if you were a United States holder.
In addition, if you are a foreign corporation, you may be subject to a branch
profits tax equal to 30% (or lower applicable treaty rate) of your earnings and
profits for the taxable year, subject to adjustments.

         Any gain realized on the disposition of a trust preferred security (or
a junior subordinated debt security) generally will not be subject to United
States federal income tax unless:

               -    that gain is  effectively  connected  with the  conduct of a
                    trade or business by you in the United States; or

               -    you are an  individual  who is present in the United  States
                    for  183  days  or  more  in  the   taxable   year  of  that
                    disposition, and certain other conditions are met.

         Special rules may apply to some non-United States holders, such as
"controlled foreign corporations", "passive foreign investment companies",
"foreign personal holding companies" and corporations that accumulate earnings
to avoid United States federal income tax, that are subject to special treatment
under the Code. These entities should consult their own tax advisors to
determine the United States federal, state, local, and other tax consequences
that may be relevant to them.

      United States federal estate tax

         Your estate will not be subject to U.S. federal estate tax on the trust
preferred securities (or the junior subordinated debt securities) beneficially
owned by you at the time of your death, provided that:

               -    you do not  own 10% or more  of the  total  combined  voting
                    power of all  classes of KeySpan  voting  stock  (within the
                    meaning of the Code and United States Treasury regulations);
                    and

               -    interest  on those  trust  preferred  securities  (or junior
                    subordinated  debt  securities)  would  not  have  been,  if
                    received  at the time of your death,  effectively  connected
                    with the conduct by you of a trade or business in the United
                    States.

      Information reporting and backup withholding

      United States holders

         In general, information reporting requirements will apply to certain
payments of principal and interest, including OID, paid on the trust preferred
securities (or the junior subordinated debt securities) and to the proceeds of
the sale of trust preferred securities (or junior subordinated debt securities)
made to you (unless you are an exempt recipient such as a corporation). A 31%
backup withholding tax will apply to such payments if you fail to provide a
taxpayer identification number or certification of exempt status, or fail to
report in full dividend and interest income.

      Non-United States holders

         In general, no information reporting or backup withholding will be
required regarding payments on the trust preferred securities (or the junior
subordinated debt securities) that KeySpan makes to you provided that it does
not have actual knowledge that you are a United States person and it has
received from you the certification described above in the first sentence under
"Consequences to non-United States holders--United States federal withholding
tax."

         In addition, no information reporting or backup withholding will be
required regarding the proceeds of the sale of trust preferred securities (or
junior subordinated debt securities) made within the United States or conducted
through certain United States financial intermediaries if:

               -    the payor  receives the  certification  described  above and
                    does not have actual  knowledge that you are a United States
                    person; or

               -    you otherwise establish an exemption.

         Any amounts withheld under the backup withholding rules will be allowed
as a refund or a credit against your United States federal income tax liability
provided the required information is furnished to the IRS.

Common and Preferred Stock

      Consequences to United States holders

         The consequences of the purchase, ownership or disposition of KeySpan
stock depend on a number of factors including:

               -    the term of the stock;

               -    any put or call option or redemption provisions with respect
                    to the stock;

               -    any  conversion  or exchange  features  with  respect to the
                    stock; and

               -    the price at which the stock is sold.

         United States holders should carefully examine the applicable
prospectus supplement regarding the material United States federal income tax
consequences, if any, of the holding and disposition of stock with such terms.

      Consequences to non-United States holders

      Dividends

         In general, dividends paid to you (including any deemed dividends that
may arise from the excess of the redemption price over the issue price or
certain adjustments to the conversion ratio of convertible instruments) will be
subject to withholding of United States federal income tax at a 30% rate or a
lower rate if so specified by an applicable income tax treaty. However,
dividends that are effectively connected with your conduct of a trade or
business within the United States and, where a tax treaty applies, are
attributable to a United States permanent establishment, are not subject to the
withholding tax. Instead, these dividends are subject to United States federal
income tax on a net income basis at applicable graduated individual or corporate
rates. You must comply with certification and disclosure requirements in order
for effectively connected income to be exempt from withholding. If you are a
foreign corporation, any effectively connected dividends you receive may also be
subject to an additional branch profits tax at a 30% rate or a lower rate if so
specified by an applicable income tax treaty.

         A non-United States holder of common or preferred stock who wishes to
claim the benefit of an applicable treaty rate, and avoid back-up withholding as
discussed below, will be required to satisfy the certification requirements of
applicable United States Treasury regulations. Special rules apply to claims for
treaty benefits made by non-United States persons that are entities rather than
individuals and to beneficial owners of dividends paid to entities in which such
beneficial owners are interest holders.

         If you are eligible for a reduced rate of United States withholding tax
pursuant to an income tax treaty you may obtain a refund of any excess amounts
withheld by filing an appropriate claim for refund with the IRS.

      Gain on disposition of common or preferred stock

         You generally will not be subject to United States federal income tax
with respect to gain recognized on a sale or other disposition of common or
preferred stock unless:

               -    the gain is  effectively  connected  with your  conduct of a
                    trade or business  in the United  States,  and,  where a tax
                    treaty applies, is attributable to a United States permanent
                    establishment;

               -    you are an individual  holding the common or preferred stock
                    as a capital  asset and are present in the United States for
                    183 or more  days in the  taxable  year of the sale or other
                    disposition and certain other conditions are met; or

               -    KeySpan  is or  has  been a  "United  States  real  property
                    holding  corporation"  for United States  federal income tax
                    purposes.

         If you are an individual non-United States holder described in the
first of the three clauses above, you will be subject to United States federal
income tax on the net gain derived from the sale. If you are an individual
non-United States holder described in the second clause above, you will be
subject to a flat 30% United States federal income tax on the gain derived from
the sale, which may be offset by United States source capital losses, even
though you are not considered a resident of the United States. If you are a
non-United States holder that is a foreign corporation and you are described in
the first clause above, you will be subject to tax on your gain under regular
graduated United States federal income tax rates and, in addition, may be
subject to a branch profits tax at a 30% rate or a lower rate if so specified by
an applicable income tax treaty.

         KeySpan believes that it is currently a "United States real property
holding corporation" for United States federal income tax purposes. So long as
the common or preferred stock sold or otherwise disposed of is regularly traded
on an established securities market, however, only a non-United States holder
who holds or held (at any time during the shorter of the five-year period
preceding the date of disposition or the holder's holding period) more than five
percent of such class of stock will be subject to U.S. federal income tax on the
disposition of such stock.

      Federal estate tax

         If you are an individual, common or preferred stock held by you at the
time of your death will be included in your gross estate for United States
federal estate tax purposes, unless an applicable estate tax treaty provides
otherwise.

      Information reporting and backup withholding

         KeySpan will be required to report annually to the IRS and to you the
amount of dividends paid to you and the tax withheld from dividend payments made
to you, regardless of whether withholding was required. KeySpan may make
available to the tax authorities in the country in which you reside under the
provisions of an applicable income tax treaty copies of the information returns
reporting the dividends and withholding.

         Backup withholding at the rate of 31% generally will apply to dividends
paid to you unless you satisfy the certification requirements of applicable
United States Treasury regulations.

         Payment of the proceeds of a sale of the common or preferred stock to
you within the United States or conducted through some United States related
financial intermediaries will be subject to both backup withholding and
information reporting unless (1)(a) you certify under penalties of perjury that
you are a non-United States holder and (b) the payor does not have actual
knowledge that you are a United States person or (2) you otherwise establish an
exemption.

         Any amounts withheld under the backup withholding rules may be allowed
as a refund or credit against your federal income tax liability provided the
required information is provided to the IRS.

         Special rules may apply to some non-United States holders, such as
"controlled foreign corporations", "passive foreign investment companies",
"foreign personal holding companies" and corporations that accumulate earnings
to avoid United States federal income tax, that are subject to special treatment
under the Code. These entities should consult their own tax advisors to
determine the United States federal, state, local, and other tax consequences
that may be relevant to them.

Preferred stock, depositary shares, stock purchase contracts, stock purchase
units, warrants and warrants units

         If you are considering the purchase of preferred stock, depositary
shares, stock purchase contracts, stock purchase units, warrants or warrant
units, you should carefully examine the applicable prospectus supplement
regarding the special United States federal income tax consequences, if any, of
the holding and disposition of the preferred stock, depositary shares, stock
purchase contracts, stock purchase units, warrants or warrant units, including
any tax considerations relating to the specific terms of the preferred stock,
depositary shares, stock purchase contracts, stock purchase units, warrants or
warrant units.








                              ERISA CONSIDERATIONS


         The following is a summary of certain considerations associated with
the purchase of the debt securities, preferred stock, depositary shares, common
stock, stock purchase units, stock purchase contracts, trust preferred
securities, warrants or warrants units by employee benefit plans that are
subject to Title I of the U.S. Employee Retirement Income Security Act of 1974,
as amended ("ERISA"), plans, individual retirement accounts and other
arrangements that are subject to Section 4975 of the Code or provisions under
any federal, state, local, non-U.S. or other laws or regulations that are
similar to such provisions of the Code or ERISA, and entities whose underlying
assets are considered to include "plan assets" of such plans, accounts and
arrangements (each, a "covered plan").

General fiduciary matters

         ERISA and the Code impose duties on fiduciaries of a covered plan
subject to Title I of ERISA or Section 4975 of the Code and prohibit
transactions involving the assets of a covered plan and its fiduciaries or other
interested parties. Under ERISA and the Code, any person who exercises any
discretionary authority or control over the administration of a covered plan or
the management or disposition of the assets of a covered plan, or who renders
investment advice for compensation to a covered plan, is generally considered a
fiduciary of the covered plan.

         In considering investing assets of any covered plan in the offered
securities, a fiduciary should determine whether the investment complies with
the documents and instruments governing the covered plan and the applicable
provisions of ERISA, the Code or any similar law relating to a fiduciary's
duties to the covered plan, including, the prudence, diversification, delegation
of control and prohibited transaction provisions of ERISA, the Code and any
other applicable similar laws.

         Any insurance company investing its general account assets in the
Securities should consider whether the investment would be subject to the
requirements of ERISA in light of the U.S. Supreme Court's decision in John
Hancock Mutual Life Insurance Co. v. Harris Trust and Savings Bank and under any
subsequent legislation or other guidance that has or may become available
relating to that decision, including the enactment of Section 401(c) of ERISA by
the Small Business Job Protection Act of 1996 and its regulations.

Prohibited Transaction Issues

         Section 406 of ERISA and Section 4975 of the Code prohibit covered
plans subject to Title I of ERISA or Section 4975 of the Code from engaging in
specified transactions with "parties in interest," within the meaning of ERISA,
or "disqualified persons," within the meaning of Section 4975 of the Code,
unless an exemption is available. A party in interest or disqualified person who
engages in a non-exempt prohibited transaction may be subject to excise taxes
and other penalties and liabilities under ERISA and the Code. In addition, the
fiduciary of a covered plan that engages in such a non-exempt prohibited
transaction may be subject to penalties and liabilities under ERISA and the
Code.

         The acquisition and/or holding of the offered securities by a covered
plan with respect to which KeySpan, the trusts, an underwriter or an agent is
considered a party in interest or a disqualified person may result in a
prohibited transaction under Section 406 of ERISA and/or Section 4975 of the
Code, unless the investment is acquired and is held in accordance with an
applicable exemption. The U.S. Department of Labor has issued prohibited
transaction class exemptions, or "PTCEs," that may apply to the offered
securities. These class exemptions include, without limitation:

               -    PTCE 84-14 respecting transactions determined by independent
                    qualified professional asset managers;

               -    PTCE  90-1  respecting  insurance  company  pooled  separate
                    accounts;

               -    PTCE  91-38  respecting  bank  collective  investment  trust
                    partnerships;

               -    PTCE  95-60   respecting  life  insurance   company  general
                    accounts; and

               -    PTCE 96-23  respecting  transactions  determined by in-house
                    asset managers,

although  there  can be no  assurance  that  all of the  conditions  of any such
exemptions will be satisfied. Plan Asset Issues

         ERISA and the Code do not define "plan assets." However, the "Plan
Asset Regulations" under ERISA provide that when a covered plan subject to Title
I of ERISA or Section 4975 of the Code acquires an equity interest in an entity
that is neither a "publicly-offered security" nor a security issued by an
investment company registered under the Investment Company Act, the covered
plan's assets include both the equity interest and an undivided interest in each
of the underlying assets of the entity unless that equity participation by
"benefit plan investors" is not significant or the entity is an "operating
company," in each case as defined in the plan asset regulations. The plan asset
regulations define an "equity interest" as any interest, other than an
instrument that is treated as indebtedness under applicable local law and which
has no substantial equity features. Equity participation in an entity by benefit
plan investors will not be significant if they hold, in the aggregate, less than
25% of the value of any class of such entity's equity, excluding equity
interests held by persons (other than benefit plan investors) with discretionary
authority or control over the assets of the entity or who provide investment
advice for a fee with respect to such assets, and any affiliates thereof. For
purposes of this 25% test, "benefit plan investors" include all employee benefit
plans, including "Keogh" plans, individual retirement accounts and pension plans
maintained by foreign corporations, as well as any entity whose underlying
assets are deemed to include "plan assets" under the plan asset regulations. The
Department of Labor has stated that in determining whether equity participation
in an entity by benefit plan investors is "significant," only the proportion of
an insurance company general account's equity investment in the entity that
represents plan assets should be taken into account and, therefore, the
proportion of that investment that represents plan assets would equal the
proportion of the insurance company general account as a whole that constitutes
plan assets.

         For purposes of the plan asset regulations, a "publicly offered
security" is a security that is:

               -    "freely transferable,"

               -    "widely held," and

               -    (1) sold as part of an offering of  securities to the public
                    pursuant to an effective  registration  statement  under the
                    Securities Act of 1933 and such security is registered under
                    the  Securities  Exchange  Act of 1934 within 120 days after
                    the end of the fiscal  year of the issuer  during  which the
                    offering of such  securities to the public has occurred,  or
                    (2) registered under Section 12 of the Exchange Act.

         KeySpan expects to qualify as an operating company within the meaning
of the plan asset regulations. KeySpan does not anticipate that the trust
preferred securities will constitute "publicly offered securities" for purposes
of the plan asset regulations, that any of the trusts will be an investment
company registered under the Investment Company Act or that any of the trusts
will qualify as an operating company within the meaning of the plan asset
regulations. In addition, if benefit plan investors invested in the trust
preferred securities, the trusts would not be in a position to monitor whether
those investments would be "significant" for purposes of the plan asset
regulations.

Plan asset consequences

         If the assets of KeySpan or the trusts were deemed to be "plan assets"
under ERISA, this would result, among other things, in:

               -    the   application  of  the  prudence  and  other   fiduciary
                    responsibility  standards  of ERISA to  investments  made by
                    KeySpan and the trusts; and

               -    the possibility  that certain  transactions in which KeySpan
                    and  the  trusts  might  seek  to  engage  could  constitute
                    "prohibited transactions" under ERISA and the Code.

         Because of the foregoing, the offered securities other than trust
preferred securities (the "KeySpan Securities") should not be purchased or held
by any person investing "plan assets" of any covered plan, if the purchase and
holding will constitute a non-exempt prohibited transaction under ERISA and the
Code or will violate any applicable similar laws.

         Because of the foregoing, the trust preferred securities should not be
purchased or held by any person investing "plan assets" of any Plan (as defined
below), except that an insurance company general account may purchase or hold
the trust preferred securities if:

               -    such   purchase  and  holding  will   constitute  an  exempt
                    prohibited  transaction under ERISA and the Code or will not
                    violate any applicable similar laws; and

               -    less  than  25% of the  assets  of  such  insurance  company
                    general account will constitute "plan assets" of any Plan.

Representation

         Accordingly, by accepting the offered securities other than trust
preferred securities, each purchaser and subsequent transferee of those
securities will be deemed to have represented and warranted that either:

               -    no  assets  used to  acquire  those  securities  constitutes
                    assets of any covered plan; or

               -    the  purchase  and  holding  of  those  securities  by  such
                    purchaser   or   transferee   will   constitute   an  exempt
                    transaction  under  Section 406 of ERISA or Section  4975 of
                    the Code or will not violate any applicable similar laws.

         By accepting the trust preferred securities, each purchaser and
subsequent transferee of the trust preferred securities will be deemed to have
represented and warranted either that:

               -    for the entire  period during which it holds its interest in
                    the trust  preferred  securities,  no portion of such assets
                    constitutes assets of any "employee benefit plan" within the
                    meaning of Section 3(3) of ERISA,  whether or not subject to
                    Title  I  of  ERISA,  including  any  U.S.  governmental  or
                    non-U.S. pension plan, or any "plan" subject to Section 4975
                    of the Code (each a "Plan") or

               -    (x)  the  assets  used  to  acquire   the  trust   preferred
                    securities constitute assets of an insurance company general
                    account,

               (y)  for  the  entire  period  during  which  such  purchaser  or
                    transferee   holds  its  interest  in  the  trust  preferred
                    securities,  less than 25% of the  assets of such  insurance
                    company general account will constitute "plan assets" of any
                    Plan, and

               (z)  the   acquisition   and  holding  of  the  trust   preferred
                    securities  will satisfy the  requirements of the Department
                    of Labor's Prohibited  Transaction Class Exemption 95-60 and
                    will not  constitute  a  non-exempt  prohibited  transaction
                    under Section 406 of ERISA or Section 4975 of the Code.

         Due to the complexity of these rules and the penalties that may be
imposed upon persons involved in non-exempt prohibited transactions, it is
particularly important that fiduciaries, or other persons purchasing on behalf
of, or with the assets of, any employee benefit plan, consult with their counsel
to determine whether such employee benefit plan is subject to Title I of ERISA,
Section 4975 of the Code or any similar laws.









                              PLAN OF DISTRIBUTION


         KeySpan may sell the offered securities as follows:

               -    through underwriters or dealers; or

               -    through agents; or

               -    directly to purchasers.

         The prospectus supplement or term sheet for each offering of securities
will describe that offering, including:

               -    the name or names of any underwriters, dealers or agents;

               -    the  purchase  price and the  proceeds to KeySpan  from that
                    sale;

               -    any  underwriting  discounts  and other  items  constituting
                    underwriters' compensation;

               -    any  initial  public  offering  price and any  discounts  or
                    concessions allowed or reallowed or paid to dealers; and

               -    any  securities  exchanges on which the debt  securities  of
                    that series may be listed.

Underwriters

         Unless otherwise set forth in the prospectus supplement or term sheet,
the obligations of the underwriters to purchase offered securities will be
subject to certain conditions. The underwriters will be obligated to purchase
all the offered securities if any are purchased.

         The offered securities will be acquired by the underwriters for their
own account and may be resold by them from time to time in one or more
transactions, including negotiated transactions, at a fixed public offering
price or at varying prices determined at the time of sale. Underwriters may be
deemed to have received compensation from KeySpan in the form of underwriting
discounts or commissions and may also receive commissions from the purchasers of
offered securities for whom they may act as agent. Underwriters may also sell
offered securities to or through dealers. These dealers may receive compensation
in the form of discounts, concessions or commissions from the underwriters
and/or commissions from the purchasers for whom they may act as agent. Any
initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.

         KeySpan may authorize underwriters to solicit offers by certain types
of institutions to purchase offered securities from it at the public offering
price stated in the prospectus supplement or term sheet required by delayed
delivery contracts providing for payment and delivery on a specified date in the
future. If KeySpan sells debt securities under these delayed delivery contracts,
the prospectus supplement or term sheet will state that as well as the
conditions to which these delayed delivery contracts will be subject and the
commissions payable for that solicitation.

Agents

         KeySpan may also sell offered securities through agents designated by
it from time to time. KeySpan will name any agents involved in the offer or sale
of the offered securities and will list commissions payable by it to these
agents in the prospectus supplement or term sheet. These agents will be acting
on a best efforts basis to solicit purchases for the period of their
appointment, unless KeySpan states otherwise in the prospectus supplement or
term sheet.

Direct sales

         KeySpan may sell debt securities directly to purchasers. In this case,
KeySpan will not engage underwriters or agents in the offer and sale of offered
securities.

Remarketing transactions

         KeySpan may also sell offered securities that it has purchased,
redeemed or repaid through one or more remarketing firms acting as principals
for their own accounts or as KeySpan's agents. The applicable prospectus
supplement or term sheet will identify any remarketing firms and describe the
terms of KeySpan's agreement with them and their compensation. Remarketing firms
may be deemed to be underwriters of the offered securities under the Securities
Act.

Indemnification

         KeySpan may indemnify underwriters, dealers or agents who participate
in the distribution of offered securities against certain liabilities, including
liabilities under the Securities Act, and agree to contribute to payments which
these underwriters, dealers or agents may be required to make.

No assurance of liquidity

         Some of the offered securities will be new issues of securities with no
established trading market. Any underwriters that purchase offered securities
from KeySpan may make a market in these debt securities. The underwriters will
not be obligated, however, to make a market in the offered securities and may
discontinue market-making at any time without notice to holders of those
securities. KeySpan cannot assure you that there will be liquidity in the
trading market for any offered securities of any series.

                                 LEGAL OPINIONS


         The validity of the securities offered by KeySpan in this prospectus
will be passed upon for it by Simpson Thacher & Bartlett, New York, New York.
Certain legal matters will be passed upon for any agents or underwriters by
Simpson Thacher & Bartlett or other counsel identified in the prospectus
supplement or term sheet.

                                     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 the twelve months ended December 31, 2000, and
related schedules incorporated by reference in this prospectus. Arthur Andersen
LLP, also audited the financial statements for Eastern Enterprises for the
twelve months ended December 31, 1998 and December 31, 1999, and related
schedules incorporated by reference in this prospectus. These financial
statements and schedules are incorporated by reference herein in reliance upon
the authority of Arthur Andersen LLP, as experts in accounting and auditing in
giving the reports.

                       WHERE YOU CAN FIND MORE INFORMATION


         KeySpan files 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. KeySpan's SEC filings are also available to the
public on the SEC's web site at http://www.sec.gov.

         KeySpan and the trusts filed a registration statement on Form S-3 with
the SEC covering the offered securities. For further information on KeySpan and
the offered securities, you should refer to the registration statement and its
exhibits. This prospectus summarizes material provisions of the offered
securities. Because the prospectus may not contain all the information that you
may find important, you should review the full text of these documents. KeySpan
and the trusts have included copies of these documents in an exhibit to its
registration statement of which this prospectus is a part.

         The SEC allows KeySpan to "incorporate by reference" the information
that it files with the SEC, which means that KeySpan 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 KeySpan files with the SEC will automatically update and
supersede this information. KeySpan incorporates 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.

               -    KeySpan's  Annual  Report on Form 10-K for the  fiscal  year
                    ended December 31, 2000;

               -    Quarterly  Report on Form 10-Q for that  period  ended March
                    31, 2001;

               -    KeySpan's  Current Report on Form 8-K filed October 6, 2000;
                    and

               -    KeySpan's Current Report on Form 8-K filed January 25, 2001.

         You may request a copy of these filings, or any of KeySpan's or the
trusts' SEC filings, at no cost, over the Internet at its web site at
http://www.keyspanenergy.com or by writing or telephoning KeySpan at the
following address:

                               Investor Relations
                               KeySpan Corporation
                              One MetroTech Center
                            Brooklyn, New York, 11201
                                 (718) 403-3385










                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

         The expenses in connection with the issuance and distribution of the
securities being registered, other than the underwriting discounts and
commissions, are as follows:

Securities and Exchange Commission Registration Fee.................. $250,000
New York Stock Exchange Listing Fee...................................$100,000
Legal Fees and Expenses...............................................$250,000
Accountants Fees and Expenses..........................................$50,000
Blue sky fees and expenses.............................................$50,000
Trustee Fees and Expenses..............................................$20,000
Rating Agency Fees....................................................$100,000
Printing and Delivery Expenses.........................................$75,000
Miscellaneous Expenses..................................................$5,000
                                                                         -----
      Total*..........................................................$900,000
                                                                       =======

- --------------
*  All of the above expenses are estimated except for the SEC filing fee.

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 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  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.







                                   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 no. 1 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Brooklyn, State of New
York, on this 17th day of May, 2001.

                          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.



                                                                    Date:

                            *                                       May 17, 2001
- -----------------------------------------------------------
Robert B. Catell
Chief Executive Officer and Director
(Principal Executive Officer)



/s/ Gerald Luterman                                                 May 17, 2001
- -----------------------------------------------------------
Gerald Luterman
Chief Financial Officer and Senior Vice-President
(Principal Financial Officer)



/s/ Ronald Jendras                                                  May 17, 2001
- -----------------------------------------------------------
Ronald Jendras
Vice President, Controller and Chief Accounting Officer
(Principal Accounting Officer)


                            *                                       May 17, 2001
- -----------------------------------------------------------
Lilyan H. Affinito
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Andrea S. Christensen
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------

Howard R. Curd
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Richard N. Daniel
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Donald H. Elliott
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Alan H. Fishman
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Vicki L. Fuller
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
J. Atwood Ives
Director




                            *                                       May 17, 2001
- -----------------------------------------------------------
James R. Jones
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
James L. Larocca
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Craig G. Matthews
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Stephen W. McKessy
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
Edward D. Miller
Director



                            *                                       May 17, 2001
- -----------------------------------------------------------
James Q. Riordan
Director


/s/ Ronald Jendras                                                  May 17, 2001
- -----------------------------------------------------------
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.





Pursuant to the requirements of the Securities Act of 1933, KeySpan Trust I,
KeySpan Trust II and KeySpan Trust III each 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 no. 1 to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of
Brooklyn, State of New York, on the 17th of May, 2001.



                           KEYSPAN TRUST I



                           /s/ Ronald S. Jendras
                           -----------------------------------------------------
                           Ronald S. Jendras
                           Trustee



                           /s/ Richard A. Rapp
                           -----------------------------------------------------
                           Richard A. Rapp
                           Trustee



                           /s/ Michael J. Taunton
                           -----------------------------------------------------
                           Michael J. Taunton
                           Trustee




                           KEYSPAN TRUST II



                           /s/ Ronald S. Jendras
                           -----------------------------------------------------
                           Ronald S. Jendras
                           Trustee



                           /s/ Richard A. Rapp
                           -----------------------------------------------------
                           Richard A. Rapp
                           Trustee



                           /s/ Michael J. Taunton
                           -----------------------------------------------------
                           Michael J. Taunton
                           Trustee




                           KEYSPAN TRUST III



                           /s/ Ronald S. Jendras
                           -----------------------------------------------------
                           Ronald S. Jendras
                           Trustee



                           /s/ Richard A. Rapp
                           -----------------------------------------------------
                           Richard A. Rapp
                           Trustee



                           /s/ Michael J. Taunton
                           -----------------------------------------------------
                           Michael J. Taunton
                           Trustee









                                  EXHIBIT INDEX

1.1***        Form of underwriting agreement for debt securities

1.2*          Form of underwriting agreement for preferred stock

1.3*          Form of underwriting agreement for depositary shares

1.4*          Form of underwriting agreement for trust preferred securities

1.5*          Form of underwriting agreement for common stock

1.6*          Form of underwriting agreement for stock purchase contracts

1.7*          Form of underwriting agreement for stock purchase units

4.1           Certificate of Incorporation of the Registrant effective April 16,
              1998, Amendment to the Certificate of Incorporation of the
              Registrant effective May 26, 1998, Amendment to the Certificate of
              Incorporation of the Registrant effective June 1, 1998, Amendment
              to the Certificate of Incorporation of the Registrant effective
              April 7, 1999 and Amendment to the Certificate of Incorporation of
              the Registration effective May 20, 1999 (filed as Exhibit 3.1 to
              the Registrant's 10-Q for the quarterly period ended June 30, 1999
              and incorporated herein by reference)

4.2           ByLaws of the  Registrant  in effect on September  10,  1998,  as
              amended  (filed as Exhibit  3.1 to the  Registrant's  Form 8-K/A,
              Amendment No. 2, on September 29, 1998 and incorporated herein by
              reference)

4.3***        Form of Common Stock Certificate

4.4***        Indenture, dated as of November 1, 2000, between the Registrant
              and The Chase Manhattan Bank, as trustee, with respect to the debt
              securities. The forms of debt securities with respect to each
              particular series of debt securities registered hereunder will be
              filed as an exhibit to a Current Report on Form 8-K and shall be
              deemed to the incorporated herein by reference

4.5***        Form of First  Supplemental  Indenture,  between the Registrant
              and The Chase  Manhattan  Bank,  as trustee,  with respect to the
              debt securities

4.6***        Form of Supplemental Indenture relating to debentures for trust
              preferred securities issuance

4.7***        Certificate of Trust of KeySpan Trust I

4.8***        Certificate of Trust of KeySpan Trust II

4.9***        Certificate of Trust of KeySpan Trust III

4.10***       Declaration of Trust of KeySpan Trust I

4.11***       Declaration of Trust of KeySpan Trust II

4.12***       Declaration of Trust of KeySpan Trust III

4.13***       Form of Amended  and  Restated  Declaration  of Trust for each
              trust  (including  the forms of  preferred  security  and  common
              security to be issued thereunder)

4.14***       Form of Guarantee with respect to the preferred  securities of
              each trust

4.15          Rights Agreement, dated March 30, 1999, by and between the
              Registrant and The Bank of New York, as Rights Agent (filed as
              Exhibit 4 to the Registrant's Current Report on Form 8-K filed on
              March 30, 1999 and incorporated herein by reference). The Rights
              Agreement includes the Certificate of Amendment to the Certificate
              of Incorporation for the Series D Preferred Stock as Exhibit A
              thereto, the Form of Rights Certificate as Exhibit B thereto and
              the Summary of Rights to Purchase Series D Preferred Stock as
              Exhibit C thereto.

4.16***       Form of Certificate of Amendment with respect to the preferred
              stock

4.17***       Form of  deposit  agreement  with  respect  to the  depositary
              shares  (including  the form of  depositary  receipt to be issued
              thereunder)

4.18***       Form of Purchase Contract Agreement

4.19***       Form of Debt Warrant Agreement

4.20***       Form of Stock Warrant Agreement

4.21***       Form of Unit Agreement

4.22***       Form of junior subordinated debt security to be issued to each
              trust

4.23***       Form of senior debt security to be issued

5.1***        Opinion and consent of Simpson Thacher & Bartlett as to the
              validity of the debt securities, preferred stock, depositary
              shares, guarantees, common stock, rights to purchase Series D
              preferred stock, stock purchase units, stock purchase contracts,
              warrants and warrant units of the Registrant being registered

5.2***        Opinion  and  consent  of  Richards,  Layton & Finger as to the
              validity of the trust preferred securities being registered

8.1***        Opinion  and  consent of Simpson  Thacher & Bartlett  regarding
              certain tax matters

12.1**        Computation  in support of ratio of earnings to fixed  charges
              and ratio of combined fixed charges and preferred dividends

23.1          Consent of Simpson  Thacher & Bartlett  (Included  in Exhibit 5.1
              above)

23.2          Consent of  Richards,  Layton & Finger  (Included  in Exhibit 5.2
              above)

23.3***       Consent of Arthur Andersen LLP

23.4***       Consent of Arthur Andersen LLP

23.5          Consent of Simpson  Thacher & Bartlett  (Included  in Exhibit 8.1
              above)

24.1**        Powers of attorney

24.2**        Certified  resolution  of  the  Board  of  Directors  of  KeySpan
              Corporation authorizing signatures pursuant to powers of attorney

25.1***       Form T-1 statement of eligibility and qualification under the
              Trust Indenture Act of 1939 (a "Form T-1") of The Chase Manhattan
              Bank ("Chase"), as trustee under the indenture with respect to the
              senior debt securities

25.2***       Form T-1 of Chase as trustee under the indenture  with respect
              to the subordinated debt securities

25.3***       Form T-1 of Chase as trustee under the declaration of trust of
              KeySpan Trust I

25.4***       Form T-1 of Chase as trustee under the declaration of trust of
              KeySpan Trust II

25.5***       Form T-1 of Chase as trustee under the declaration of trust of
              KeySpan Trust III

25.6***       Form T-1 of Chase  as  trustee  under  the  guarantee  for the
              benefit of holders of trust preferred securities of KeySpan Trust
              I

25.7***       Form T-1 of Chase  as  trustee  under  the  guarantee  for the
              benefit of holders of trust preferred securities of KeySpan Trust
              II

25.8***       Form T-1 of Chase  as  trustee  under  the  guarantee  for the
              benefit of holders of trust preferred securities of KeySpan Trust
              III

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

*       To be filed as an Exhibit to a Current Report on Form 8-K

**      Previously filed in the same numbered Exhibit.

***     Filed herewith.