Exhibit 4.19








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                               KEYSPAN CORPORATION

                                       and

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

                               Debt Warrant Agent

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

                                     FORM OF
                 [SENIOR] [SUBORDINATED] DEBT WARRANT AGREEMENT*

                        Dated as of ______________, 200_

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*    OPTIONS  REPRESENTED  BY  BRACKETED  OR  BLANK  SECTIONS  HEREIN  SHALL  BE
     DETERMINED  IN  CONFORMITY   WITH  APPLICABLE   PROSPECTUS   SUPPLEMENT  OR
     SUPPLEMENTS









                                TABLE OF CONTENTS



                                    ARTICLE I


                   ISSUANCE OF DEBT WARRANTS AND EXECUTION AND
                      DELIVERYOF DEBT WARRANT CERTIFICATES
                                                                                                          
Section 1.1   Issuance of Debt Warrants...........................................................................1

Section 1.2   Form and Execution of Debt Warrant Certificates.....................................................2

Section 1.3   Issuance and Delivery of Debt Warrant Certificates..................................................3

Section 1.4   Temporary Debt Warrant Certificates.................................................................3

Section 1.5   Payment of Certain Taxes............................................................................3

Section 1.6   "Holder"............................................................................................4

                                   ARTICLE II

                     DURATION AND EXERCISE OF DEBT WARRANTS

Section 2.1   Duration of Debt Warrants...........................................................................4

Section 2.2   Exercise of Debt Warrants...........................................................................4

                                   ARTICLE III

                          OTHER PROVISIONS RELATING TO RIGHTS OF HOLDERS OF DEBT WARRANTS

Section 3.1   No Rights as Holder of Underlying Debt Securities Conferred by Debt Warrants or Debt Warrant
                  Certificates....................................................................................6

Section 3.2   Lost, Stolen, Destroyed or Mutilated Debt Warrant Certificates......................................6

Section 3.3   Holder of Debt Warrants May Enforce Rights..........................................................6

                                   ARTICLE IV

                     EXCHANGE AND TRANSFER OF DEBT WARRANTS

[Section 4.1  Debt Warrant Register; Exchange and Transfer of Debt Warrants.......................................7

Section 4.2   Treatment of Holders of Debt Warrants...............................................................8

Section 4.3   Cancellation of Debt Warrant Certificates...........................................................8

                                    ARTICLE V

                        CONCERNING THE DEBT WARRANT AGENT

Section 5.1   Debt Warrant Agent..................................................................................8

Section 5.2   Conditions of Debt Warrant Agent's Obligations......................................................8

Section 5.3   Resignation and Removal; Appointment of Successor..................................................10

Section 5.4   Compliance With Applicable Laws....................................................................12

Section 5.5   Office.............................................................................................12

                                   ARTICLE VI

                                  MISCELLANEOUS

Section 6.1   Consolidation or Merger of the Company and Conveyance or Transfer Permitted Subject to Certain
                  Conditions.....................................................................................12

Section 6.2   Rights and Duties of Successor Corporation.........................................................13

Section 6.3   Supplements and Amendments.........................................................................13

Section 6.4   Notices and Demands to the Company and Debt Warrant Agent..........................................13

Section 6.5   Addresses..........................................................................................14

Section 6.6   Applicable Law.....................................................................................14

Section 6.7   Delivery of Prospectus.............................................................................14

Section 6.8   Governmental Approvals.............................................................................14

Section 6.9   Persons Having Rights under Debt Warrant Agreement.................................................14

Section 6.10   Headings..........................................................................................15

Section 6.11   Counterparts......................................................................................15

Section 6.12   Inspection of Agreement...........................................................................15














         THIS [SENIOR] [SUBORDINATED] DEBT WARRANT AGREEMENT, dated as of
__________, between KeySpan Corporation, a New York corporation (the "Company"),
and ____________________, a __________ organized and existing under the laws of
__________, as warrant agent (the "Debt Warrant Agent").

         WHEREAS, the Company has entered into an Indenture dated as of November
1, 2000, as amended and supplemented from time to time (the "Indenture"), with
The Chase Manhattan Bank, as trustee (the "Trustee"), providing for the issuance
by the Company from time to time, in one or more series, of debt securities
evidencing its unsecured, ________________ indebtedness (such debt securities,
being referred to as the "Securities"); and

         WHEREAS, the Company proposes to issue warrants (the "Debt Warrants")
representing the right to purchase Debt Securities of one or more series (the
"Underlying Debt Securities"); and

         WHEREAS, the Company has duly authorized the execution and delivery of
this Debt Warrant Agreement to provide for the issuance of Debt Warrants to be
exercisable at such times and for such prices, and to have such other
provisions, as shall be fixed as hereinafter provided;

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein contained, the parties hereto agree as follows:

                                   ARTICLE I

                   ISSUANCE OF DEBT WARRANTS AND EXECUTION AND
                      DELIVERY OF DEBT WARRANT CERTIFICATES

     Section 1.1  Issuance of Debt  Warrants.  Debt  Warrants may be issued from
time to time, together with or separately from any Securities (the "Offered Debt
Securities").  Prior  to the  issuance  of any  Debt  Warrants,  there  shall be
established  by or pursuant to a resolution or  resolutions  duly adopted by the
Company's Board of Directors or by any committee  thereof duly authorized to act
with respect thereto (a "Board Resolution"):

     (a)  the title and aggregate number of such Debt Warrants;

     (b)  the offering price of such Debt Warrants, if any;

     (c)  whether  such Debt  Warrants  are to be issued with any  Offered  Debt
          Securities and, if so, the title, aggregate principal amount and terms
          of any such Offered Debt Securities; the number of Debt Warrants to be
          issued  with  each  $1,000  principal  amount  of  such  Offered  Debt
          Securities  (or such  other  principal  amount  of such  Offered  Debt
          Securities  as is provided for in or pursuant to a Board  Resolution);
          and the date,  if any, on and after which such Debt  Warrants and such
          Offered  Debt   Securities  will  be  separately   transferable   (the
          "Detachable Date");

     (d)  the title,  aggregate  principal amount,  ranking and terms (including
          the  subordination  and conversion  provisions) of the Underlying Debt
          Securities that may be purchased upon exercise of such Debt Warrants;

     (e)  the time or times at which,  or period or periods  during which,  such
          Debt Warrants may be exercised,  the minimum or maximum amount of Debt
          Warrants  which may be exercised at any one time and the final date on
          which such Debt Warrants may be exercised (the "Expiration Date");

     (f)  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 (the "Debt Warrant  Price"),  at which
          such principal amount may be purchased upon such exercise;

     (g)  the terms of any right to redeem or call such Debt Warrants; and

     (h)  any  other  terms of such  Debt  Warrants  not  inconsistent  with the
          provisions of this Agreement.

     Section 1.2 Form and Execution of Debt Warrant  Certificates.  (a) The Debt
Warrants  shall  be  evidenced  by  warrant   certificates  (the  "Debt  Warrant
Certificates"), which may be in registered or bearer form and otherwise shall be
substantially  in such form or forms as shall be established by or pursuant to a
Board Resolution. Each Debt Warrant Certificate, whenever issued, shall be dated
the  date it is  countersigned  by the Debt  Warrant  Agent  and may  have  such
letters,  numbers or other  identifying  marks and such legends or  endorsements
printed,  lithographed  or  engraved  thereon as are not  inconsistent  with the
provisions  of  this  Agreement,  or as may  be  required  to  comply  with  any
applicable  law,  rule or  regulation  or with  any  rule or  regulation  of any
securities  exchange on which the Debt Warrants may be listed,  or to conform to
usage,  as the  officer of the  Company  executing  the same may  approve  (such
officer's  execution thereof to be conclusive  evidence of such approval).  Each
Debt Warrant Certificate shall evidence one or more Debt Warrants.

     (b)  The  Debt  Warrant  Certificates  shall be  signed  in the name and on
          behalf of the Company by its Chairman of the Board of Directors,  Vice
          Chairman of the Board, or its President or one of its Vice Presidents.
          Such  signatures may be manual or facsimile  signatures of the present
          or any  future  holder  of any such  office  and may be  imprinted  or
          otherwise reproduced on the Debt Warrant Certificates. The seal of the
          Company  may  be in  the  form  of a  facsimile  thereof  and  may  be
          impressed,  affixed,  imprinted  or otherwise  reproduced  on the Debt
          Warrant Certificates.

     (c)  No Debt Warrant  Certificate  shall be valid for any  purpose,  and no
          Debt Warrant  evidenced thereby shall be deemed issued or exercisable,
          until such Debt  Warrant  Certificate  has been  countersigned  by the
          manual  or  facsimile  signature  of  the  Debt  Warrant  Agent.  Such
          signature by the Debt Warrant Agent upon any Debt Warrant  Certificate
          executed by the Company  shall be  conclusive  evidence  that the Debt
          Warrant Certificate so countersigned has been duly issued hereunder.

     (d)  In case any  officer of the  Company  who shall  have  signed any Debt
          Warrant  Certificate  either manually or by facsimile  signature shall
          cease to be such officer before the Debt Warrant Certificate so signed
          shall have been countersigned and delivered by the Debt Warrant Agent,
          such Debt Warrant  Certificate  nevertheless may be countersigned  and
          delivered   as  though  the  person  who  signed  such  Debt   Warrant
          Certificate had not ceased to be such officer of the Company;  and any
          Debt  Warrant  Certificate  may be signed on behalf of the  Company by
          such  person  as, at the  actual  date of the  execution  of such Debt
          Warrant  Certificate,  shall be the  proper  officer  of the  Company,
          although at the date of the  execution of this  Agreement  such person
          was not such an officer.

     Section 1.3 Issuance and Delivery of Debt Warrant Certificates. At any time
and from time to time after the  execution and delivery of this  Agreement,  the
Company may deliver  Debt  Warrant  Certificates  executed by the Company to the
Debt Warrant  Agent for  countersignature.  Except as provided in the  following
sentence,  the Debt Warrant Agent shall  thereupon and deliver such Debt Warrant
Certificates  to or upon the written  request of the Company.  Subsequent to the
original issuance of a Debt Warrant  Certificate  evidencing Debt Warrants,  the
Debt Warrant Agent shall countersign a new Debt Warrant  Certificate  evidencing
such Debt Warrants only if such Debt Warrant  Certificate  is issued in exchange
or  substitution  for  one  or  more  previously   countersigned   Debt  Warrant
Certificates evidencing such Debt Warrants or in connection with their transfer,
as hereinafter provided.

     Section 1.4 Temporary Debt Warrant Certificates. Pending the preparation of
definitive  Debt Warrant  Certificates,  the Company may  execute,  and upon the
order of the  Company the Debt  Warrant  Agent shall  countersign  and  deliver,
temporary Debt Warrant Certificates that are printed, lithographed, typewritten,
mimeographed or otherwise produced, substantially of the tenor of the definitive
Debt  Warrant  Certificates  in lieu of which  they  are  issued  and with  such
appropriate  insertions,  omissions,  substitutions  and other variations as the
officer executing such Debt Warrant Certificates may determine,  as evidenced by
such officer's execution of such Debt Warrant Certificates.

                  If temporary Debt Warrant Certificates are issued, the Company
will cause definitive Debt Warrant Certificates to be prepared without
unreasonable delay. After the preparation of definitive Debt Warrant
Certificates, the temporary Debt Warrant Certificates shall be exchangeable for
definitive Debt Warrant Certificates upon surrender of the temporary Debt
Warrant Certificates at the corporate trust office of the Debt Warrant Agent or
__________, without charge to the Holder, as defined in Section 1.6 hereof. Upon
surrender for cancellation of any one or more temporary Debt Warrant
Certificates, the Company shall execute and the Debt Warrant Agent shall
countersign and deliver in exchange therefor definitive Debt Warrant
Certificates representing the same aggregate number of Debt Warrants. Until so
exchanged, the temporary Debt Warrant Certificates shall in all respects be
entitled to the same benefits under this Agreement as definitive Debt Warrant
Certificates.

     Section 1.5 Payment of Certain  Taxes.  The Company  will pay all stamp and
other duties,  if any, to which this  Agreement or the original  issuance of the
Debt Warrants or Debt Warrant  Certificates may be subject under the laws of the
United States of America or any state or locality.

     Section 1.6 "Holder".  The term "Holder" or "Holders",  as used herein with
reference to a Debt Warrant Certificate, shall mean [if registered Debt Warrants
the person or persons in whose name such Debt Warrant  Certificate shall then be
registered  as set forth in the Debt Warrant  Register to be  maintained  by the
Debt  Warrant  Agent  pursuant to Section 4.1 for that  purpose] [if bearer Debt
Warrants - the bearer of such Debt Warrant  Certificate] or, in the case of Debt
Warrants  that are issued  with  Offered  Debt  Securities  and  cannot  then be
transferred  separately  therefrom,  [if registered  Offered Debt Securities and
Debt Warrants that are not then detachable - the person or persons in whose name
the related  Offered Debt  Securities  shall be  registered  as set forth in the
security  register  to be  maintained  by the  Trustee  for  such  Offered  Debt
Securities  pursuant to the Indenture]  [if bearer  Offered Debt  Securities and
Debt Warrants that are not then  detachable - the bearer of the related  Offered
Debt  Security],  prior to the  Detachable  Date.  [If  registered  Offered Debt
Securities and Debt Warrants that are not then detachable - The Company will, or
will cause the security  registrar of any such Offered Debt  Securities to, make
available to the Debt  Warrant  Agent at all times  (including  on and after the
Detachable  Date,  in the case of Debt Warrants  originally  issued with Offered
Debt  Securities and not  subsequently  transferred  separately  therefrom) such
information as to holders of Offered Debt  Securities  with Debt Warrants as may
be necessary to keep the Warrant Register up to date.]

                                   ARTICLE II

                     DURATION AND EXERCISE OF DEBT WARRANTS

     Section 2.1 Duration of Debt  Warrants.  Each Debt Warrant may be exercised
at the time or times,  or during the period or periods,  provided by or pursuant
to the Board  Resolution  relating  thereto and  specified  in the Debt  Warrant
Certificate  evidencing such Debt Warrant. Each Debt Warrant not exercised at or
before 5:00 P.M., New York City time, on its Expiration  Date shall become void,
and all  rights of the  Holder of such Debt  Warrant  thereunder  and under this
Agreement shall cease, provided that the Company reserves the right to, and may,
in its sole discretion, at any time and from time to time, at such time or times
as the Company so  determines,  extend the  Expiration  Date of the Warrants for
such  periods of time as it chooses.  Whenever the  Expiration  Date of the Debt
Warrants is so extended,  the Company shall at least [20] days prior to the then
Expiration  Date cause to be mailed to the Debt Warrant Agent and the registered
Holders of the Debt  Warrants in accordance  with the  provisions of Section 6.4
hereof a notice stating that the  Expiration  Date has been extended and setting
forth the new Expiration Date.

     Section 2.2  Exercise of Debt  Warrants.  (a) The Holder of a Debt  Warrant
shall have the right, at its option,  to exercise such Debt Warrant and, subject
to  subsection  (f) of this  Section  2.2,  purchase  the  principal  amount  of
Underlying Debt  Securities  provided for therein at the time or times or during
the  period or periods  referred  to in Section  2.1 and  specified  in the Debt
Warrant Certificate evidencing such Debt Warrant. Except as may be provided in a
Debt Warrant Certificate, a Debt Warrant may be exercised by completing the form
of  election  to  purchase  set forth on the  reverse  side of the Debt  Warrant
Certificate, by duly executing and delivering the same, together with payment in
full of the Debt Warrant  Price in lawful money of the United States of America,
in cash or by certified or official bank check or by bank wire transfer,  to the
Debt Warrant Agent. Except as may be provided in a Debt Warrant Certificate, the
date on which such Debt Warrant Certificate and payment are received by the Debt
Warrant  Agent as  aforesaid  shall be  deemed  to be the date on which the Debt
Warrant is exercised and the Underlying Debt Securities are issued.

     (b)  Upon the exercise of a Debt Warrant, the Company shall issue, pursuant
          to the Indenture, in authorized  denominations to or upon the order of
          the Holder of such Debt Warrant,  the  Underlying  Debt  Securities to
          which  such  Holder  is  entitled,  in the form  required  under  such
          Indenture,  registered,  in the case of Underlying  Debt Securities in
          registered  form,  in such  name or names as may be  directed  by such
          Holder.

     (c)  If fewer than all of the Debt  Warrants  evidenced  by a Debt  Warrant
          Certificate  are  exercised,   the  Company  shall  execute,   and  an
          authorized  officer of the Debt Warrant  Agent shall  countersign  and
          deliver, a new Debt Warrant Certificate  evidencing the number of Debt
          Warrants remaining unexercised.

     (d)  The Debt  Warrant  Agent  shall  deposit  all funds  received by it in
          payment  of the Debt  Warrant  Price  in the  account  of the  Company
          maintained  with it for such  purpose and shall  advise the Company by
          telephone  by 5:00 P.M.,  New York City  time,  of each day on which a
          payment of the Debt Warrant Price for Debt Warrants is received of the
          amount so  deposited  in its  account.  The Debt  Warrant  Agent shall
          promptly confirm such telephone advice in writing to the Company.

     (e)  The Debt  Warrant  Agent  shall,  from time to time,  as  promptly  as
          practicable,  advise the  Company and the Trustee of (i) the number of
          Debt  Warrants of each title  exercised as provided  herein,  (ii) the
          instructions of each Holder with respect to delivery of the Underlying
          Debt  Securities to which such Holder is entitled upon such  exercise,
          (iii)  the  delivery  of  Debt  Warrant  Certificates  evidencing  the
          balance, if any, of the Debt Warrants remaining unexercised after such
          exercise,  and (iv)  such  other  information  as the  Company  or the
          Trustee  shall  reasonably  require.  Such  notice  may  be  given  by
          telephone to be promptly confirmed in writing.

     (f)  The Holder, and not the Company, shall be required to pay any stamp or
          other  tax  or  other  governmental  charge  that  may be  imposed  in
          connection  with  any  transfer   involved  in  the  issuance  of  the
          Underlying Debt Securities; and in the event that any such transfer is
          involved,  the Company  shall not be required to issue any  Underlying
          Debt  Securities  (and the Holder's  purchase of the  Underlying  Debt
          Securities  upon the exercise of such  Holder's Debt Warrant shall not
          be deemed to have been  consummated)  until  such tax or other  charge
          shall  have  been  paid or it has been  established  to the  Company's
          satisfaction that no such tax or other charge is due.

                                  ARTICLE III

                 OTHER PROVISIONS RELATING TO RIGHTS OF HOLDERS
                                OF DEBT WARRANTS

     Section 3.1 No Rights as Holder of Underlying Debt Securities  Conferred by
Debt  Warrants or Debt  Warrant  Certificates.  No Debt  Warrant or Debt Warrant
Certificate  shall  entitle  the  Holder  to any of the  rights  of a holder  of
Underlying Debt Securities,  including, without limitation, the right to receive
the payment of  principal of (or  premium,  if any, on) or interest,  if any, on
Underlying Debt Securities or to enforce any of the covenants in the Indenture.

     Section 3.2 Lost, Stolen, Destroyed or Mutilated Debt Warrant Certificates.
Upon  receipt by the Company and the Debt Warrant  Agent of evidence  reasonably
satisfactory  to them of the ownership of and the loss,  theft,  destruction  or
mutilation  of any Debt  Warrant  Certificate  and of  indemnity  (other than in
connection with any mutilated Debt Warrant Certificates  surrendered to the Debt
Warrant Agent for  cancellation)  reasonably  satisfactory  to them, the Company
shall  execute,  and the Debt Warrant Agent shall  countersign  and deliver,  in
exchange  for or in lieu of each  lost,  stolen,  destroyed  or  mutilated  Debt
Warrant Certificate,  a new Debt Warrant Certificate evidencing a like number of
Debt  Warrants  of the same  title.  Upon  the  issuance  of a new Debt  Warrant
Certificate  under this  Section,  the  Company may require the payment of a sum
sufficient to cover any stamp or other tax or other governmental charge that may
be imposed in connection  therewith and any other  expenses  (including the fees
and  expenses  of  the  Debt  Warrant  Agent)  in  connection  therewith.  Every
substitute  Debt Warrant  Certificate  executed and  delivered  pursuant to this
Section in lieu of any lost, stolen or destroyed Debt Warrant  Certificate shall
represent a  contractual  obligation  of the Company,  whether or not such lost,
stolen or destroyed Debt Warrant Certificate shall be at any time enforceable by
anyone,  and shall be entitled to the  benefits  of this  Agreement  equally and
proportionately with any and all other Debt Warrant Certificates,  duly executed
and  delivered  hereunder,  evidencing  Debt  Warrants  of the same  title.  The
provisions  of this  Section are  exclusive  and shall  preclude  (to the extent
lawful) all other rights and remedies with respect to the  replacement  of lost,
stolen, destroyed or mutilated Debt Warrant Certificates.

     Section 3.3 Holder of Debt Warrants May Enforce Rights. Notwithstanding any
of the provisions of this Agreement,  a Holder,  without the consent of the Debt
Warrant Agent, the Trustee,  the holder of any Underlying Debt Securities or the
Holder  of any  other  Debt  Warrant,  may,  on its own  behalf  and for its own
benefit,  enforce, and may institute and maintain any suit, action or proceeding
against  the  Company to  enforce,  or  otherwise  in  respect  of, its right to
exercise  its Debt  Warrant  or Debt  Warrants  in the manner  provided  in this
Agreement and its Debt Warrant Certificate.

                                   ARTICLE IV

                     EXCHANGE AND TRANSFER OF DEBT WARRANTS

         [Section 4.1 Debt Warrant Register; Exchange and Transfer of Debt
Warrants. If registered Debt Warrants - The Debt Warrant Agent shall maintain,
at its corporate trust office [or at __________], a register (the " Debt Warrant
Register") in which, upon the issuance of Debt Warrants, or on and after the
Detachable Date in the case of Debt Warrants not separately transferable prior
thereto, and, subject to such reasonable regulations as the Debt Warrant Agent
may prescribe, it shall register Debt Warrant Certificates and exchanges and
transfers thereof. The Debt Warrant Register shall be in written form or in any
other form capable of being converted into written form within a reasonable
time.]

         Except as provided in the following sentence, upon surrender at the
corporate trust office of the Debt Warrant Agent [or at __________] Debt Warrant
Certificates may be exchanged for one or more other Debt Warrant Certificates
evidencing the same aggregate number of Debt Warrants of the same title, or may
be transferred in whole or in part. A Debt Warrant Certificate evidencing Debt
Warrants that are not then transferable separately from the Offered Debt
Security with which they were issued may be exchanged or transferred prior to
its Detachable Date only together with such Offered Debt Security and only for
the purpose of effecting, or in conjunction with, an exchange or transfer of
such Offered Debt Security; and on or prior to the Detachable Date, [if
registered Offered Debt Securities and Debt Warrants - each exchange or transfer
of such Offered Debt Security on the security register of the Offered Debt
Securities shall operate also to exchange or transfer the related Debt Warrant]
[if bearer Offered Debt Securities and Debt Warrants - an exchange or transfer
of possession of the related Offered Debt Security shall operate also to
exchange or transfer the related Debt Warrants]. [If registered Debt Warrants -
A transfer shall be registered upon surrender of a Debt Warrant Certificate to
the Debt Warrant Agent at its corporate trust office [or at __________] for
transfer, properly endorsed or accompanied by appropriate instruments of
transfer and written instructions for transfer, all in form satisfactory to the
Company and the Debt Warrant Agent duly signed by the registered holder or
holders thereof or by the duly appointed legal representative thereof or by a
duly authorized attorney, such signature to be guaranteed by (a) a bank or trust
company, (b) a broker or dealer that is a member of the National Association of
Securities Dealers, Inc. (the "NASD") or (c) a member of a national securities
exchange. Upon any such registration of transfer, a new Debt Warrant Certificate
shall be issued to the transferee.] Whenever a Debt Warrant Certificate is
surrendered for exchange or transfer, the Debt Warrant Agent shall countersign
and deliver to the person or persons entitled thereto one or more Debt Warrant
Certificates duly executed by the Company, as so requested. The Debt Warrant
Agent shall not be required to effect any exchange or transfer which will result
in the issuance of a Debt Warrant Certificate evidencing a fraction of a Debt
Warrant. All Debt Warrant Certificates issued upon any exchange or transfer of a
Debt Warrant Certificate shall be the valid obligations of the Company,
evidencing the same obligations, and entitled to the same benefits under this
Agreement, as the Debt Warrant Certificate surrendered for such exchange or
transfer.

                  No service charge shall be made for any exchange or transfer
of Debt Warrants, but the Company may require payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in connection
with any such exchange or transfer, in accordance with Section 2.2(f) hereof.

     Section 4.2 Treatment of Holders of Debt  Warrants.  Every Holder of a Debt
Warrant, by accepting the Debt Warrant Certificate evidencing the same, consents
and agrees with the Company,  the Debt Warrant Agent and with every other Holder
of Debt  Warrants of the same title that the Company and the Debt Warrant  Agent
may treat the Holder of a Debt  Warrant  Certificate  (or,  if the Debt  Warrant
Certificate  is not then  detachable,  the Holder of the  related  Offered  Debt
Security) as the absolute owner of such Debt Warrant for all purposes and as the
person  entitled to exercise the rights  represented  by such Debt Warrant,  any
notice to the contrary notwithstanding.

     Section 4.3  Cancellation of Debt Warrant  Certificates.  In the event that
the Company shall purchase,  redeem or otherwise acquire any Debt Warrants after
the issuance thereof,  the Debt Warrant  Certificate or Certificates  evidencing
such Debt Warrants shall thereupon be delivered to the Debt Warrant Agent and be
cancelled  by it. The Debt  Warrant  Agent  shall also  cancel any Debt  Warrant
Certificate  (including any mutilated Debt Warrant Certificate)  delivered to it
for  exercise,  in whole or in part,  or for  exchange  [or  transfer]  [if Debt
Warrant  Certificates  are issued in bearer  form - , except  that Debt  Warrant
Certificates  delivered to the Debt  Warrant  Agent in exchange for Debt Warrant
Certificates  of other  denominations  may be retained by the Debt Warrant Agent
for reissue].  Debt Warrant  Certificates so cancelled shall be delivered by the
Debt  Warrant  Agent  to the  Company  from  time to  time,  or  disposed  of in
accordance with the instructions of the Company.

                                   ARTICLE V

                        CONCERNING THE DEBT WARRANT AGENT

     Section   5.1   Debt   Warrant   Agent.   The   Company   hereby   appoints
___________________  as Debt Warrant Agent of the Company in respect of the Debt
Warrants  and the Debt  Warrant  Certificates  upon the terms and subject to the
conditions   set  forth  herein;   and   _______________   hereby  accepts  such
appointment.  The Debt Warrant Agent shall have the powers and authority granted
to and conferred  upon it in the Debt Warrant  Certificates  and hereby and such
further powers and authority acceptable to it to act on behalf of the Company as
the  Company  may  hereafter  grant to or confer  upon it.  All of the terms and
provisions  with  respect to such  powers and  authority  contained  in any Debt
Warrant  Certificate  are subject to and  governed  by the terms and  provisions
hereof.

     Section  5.2  Conditions  of Debt  Warrant  Agent's  Obligations.  The Debt
Warrant  Agent  accepts  its  obligations  set forth  herein  upon the terms and
conditions hereof,  including the following,  to all of which the Company agrees
and to all of which the rights hereunder of the Holders shall be subject:

     (a)  Compensation and  Indemnification.  The Company agrees to promptly pay
          the Debt  Warrant  Agent  the  compensation  [set  forth in  Exhibit A
          hereto]  and to  reimburse  the  Debt  Warrant  Agent  for  reasonable
          out-of-pocket  expenses  (including counsel fees) incurred by the Debt
          Warrant Agent in connection  with the services  rendered  hereunder by
          the Debt Warrant Agent.  The Company also agrees to indemnify the Debt
          Warrant  Agent  for,  and to  hold  it  harmless  against,  any  loss,
          liability or expense  (including the reasonable  costs and expenses of
          defending against any claim of liability)  incurred without negligence
          or bad faith on the part of the Debt Warrant  Agent  arising out of or
          in connection with its appointment,  status or service as Debt Warrant
          Agent hereunder.

     (b)  Agent  for  the  Company.  In  acting  under  this  Agreement  and  in
          connection with any Debt Warrant  Certificate,  the Debt Warrant Agent
          is  acting  solely as agent of the  Company  and does not  assume  any
          obligation or relationship of agency or trust for or with any Holder.

     (c)  Counsel.  The Debt Warrant Agent may consult with counsel satisfactory
          to it,  and the  advice  of such  counsel  shall be full and  complete
          authorization and protection in respect of any action taken,  suffered
          or omitted by it  hereunder in good faith and in  accordance  with the
          advice of such counsel.

     (d)  Documents.  The Debt Warrant  Agent shall be protected and shall incur
          no  liability  for or in  respect  of any action  taken,  suffered  or
          omitted  by  it in  reliance  upon  any  notice,  direction,  consent,
          certificate,   affidavit,   statement   or  other  paper  or  document
          reasonably  believed by it to be genuine and to have been presented or
          signed by the proper parties.

     (e)  Officer's  Certificate.  Whenever  in the  performance  of its  duties
          hereunder  the Debt Warrant Agent shall  reasonably  deem it necessary
          that any fact or matter be proved or  established by the Company prior
          to  taking,  suffering  or  omitting  any action  hereunder,  the Debt
          Warrant Agent may (unless other evidence in respect  thereof be herein
          specifically  prescribed),  in the  absence  of bad faith on its part,
          rely  upon a  certificate  signed  by the  Chairman  of the  Board  of
          Directors, the Vice Chairman of the Board of Directors, the President,
          an  Executive  Vice  President,  and by the  Treasurer,  an  Assistant
          Treasurer,  the Secretary or an Assistant Secretary of the Company (an
          "Officer's  Certificate") delivered by the Company to the Debt Warrant
          Agent.

     (f)  Actions  Through  Agents.  The Debt  Warrant  Agent  may  execute  and
          exercise  any of the rights or powers  hereby  vested in it or perform
          any duty  hereunder  either  itself or by or through its  attorneys or
          agents,  and  the  Debt  Warrant  Agent  shall  not be  answerable  or
          accountable  for any act,  default,  neglect or misconduct of any such
          attorney or agent or for any loss to the Company  resulting  from such
          neglect or misconduct;  provided,  however, that reasonable care shall
          have been exercised in the selection and continued  employment of such
          attorneys and agents.

     (g)  Certain  Transactions.  The  Debt  Warrant  Agent,  and  any  officer,
          director or employee thereof,  may become the owner of, or acquire any
          interest in, any Debt Warrant, with the same rights that he, she or it
          would have if it were not the Debt Warrant  Agent,  and, to the extent
          permitted by applicable law, he, she or it may engage or be interested
          in any financial or other  transaction  with the Company and may serve
          on, or as  depository,  trustee or agent for, any committee or body of
          holders of  Underlying  Debt  Securities or other  obligations  of the
          Company  as if it were not the Debt  Warrant  Agent.  Nothing  in this
          Agreement  shall be deemed to  prevent  the Debt  Warrant  Agent  from
          acting as Trustee under the Indenture.

     (h)  No Liability for Interest.  The Debt Warrant Agent shall not be liable
          for interest on any monies at any time  received by it pursuant to any
          of  the   provisions  of  this   Agreement  or  of  the  Debt  Warrant
          Certificates, except as otherwise agreed with the Company.

     (i)  No Liability  for  Invalidity.  The Debt Warrant  Agent shall incur no
          liability with respect to the validity of this Agreement (except as to
          the due  execution  hereof  by the  Debt  Warrant  Agent)  or any Debt
          Warrant Certificate (except as to the countersignature  thereof by the
          Debt Warrant Agent).

     (j)  No Responsibility for Company Representations.  The Debt Warrant Agent
          shall not be  responsible  for any of the recitals or  representations
          contained herein (except as to such statements or recitals as describe
          the Debt Warrant Agent or action taken or to be taken by it) or in any
          Debt  Warrant  Certificate  (except  as to the  Debt  Warrant  Agent's
          countersignature  on such  Debt  Warrant  Certificate),  all of  which
          recitals and representations are made solely by the Company.

     (k)  No Implied  Obligations.  The Debt Warrant Agent shall be obligated to
          perform only such duties as are specifically set forth herein,  and no
          other duties or obligations  shall be implied.  The Debt Warrant Agent
          shall not be under any  obligation to take any action  hereunder  that
          may  subject it to any  expense  or  liability,  the  payment of which
          within a reasonable time is not, in its reasonable opinion, assured to
          it. The Debt Warrant Agent shall not be  accountable or under any duty
          or  responsibility  for the use by the  Company  of any  Debt  Warrant
          Certificate  countersigned  by the Debt Warrant Agent and delivered by
          it to the Company pursuant to this Agreement or for the application by
          the  Company of the  proceeds  of the  issuance  or  exercise  of Debt
          Warrants.  The Debt Warrant Agent shall have no duty or responsibility
          in  case of any  default  by the  Company  in the  performance  of its
          covenants  or  agreements  contained  herein  or in any  Debt  Warrant
          Certificate  or in case of the  receipt of any  written  demand from a
          Holder with respect to such default,  including,  without limiting the
          generality of the foregoing, any duty or responsibility to initiate or
          attempt to initiate any  proceedings at law or otherwise or, except as
          provided in Section 6.4 hereof, to make any demand upon the Company.

     Section 5.3  Resignation  and Removal;  Appointment  of Successor.  (a) The
Company agrees, for the benefit of the Holders of the Debt Warrants,  that there
shall at all times be a Debt Warrant Agent hereunder until all the Debt Warrants
are no longer exercisable.

     (b)  The Debt  Warrant  Agent  may at any  time  resign  as such by  giving
          written  notice  to the  Company,  specifying  the date on which  such
          resignation shall become effective;  provided that such date shall not
          be less than [90] days after the date on which  such  notice is given,
          unless the Company agrees to accept a shorter notice. Such resignation
          is subject to the  appointment  and  acceptance  of a  successor  Debt
          Warrant  Agent,  as  hereinafter  provided.  The  Debt  Warrant  Agent
          hereunder  may be  removed  at any  time by the  filing  with it of an
          instrument  in  writing  signed  by or on behalf  of the  Company  and
          specifying  such removal and the date when it shall become  effective.
          Notwithstanding   the   provisions  of  this  Section   5.3(b),   such
          resignation or removal shall take effect only upon the  appointment by
          the Company,  as  hereinafter  provided,  of a successor  Debt Warrant
          Agent  (which  shall be a bank or trust  company  organized  and doing
          business  under the laws of the United  States of  America,  any State
          thereof or the District of Columbia, authorized under the laws of such
          jurisdiction to exercise corporate trust powers and having at the time
          of its  appointment  as Debt  Warrant  Agent a  combined  capital  and
          surplus (as set forth in its most recent published report of financial
          condition)  of at  least  [$50,000,000])  and the  acceptance  of such
          appointment  by such  successor  Debt  Warrant  Agent.  In the event a
          successor  Debt  Warrant  Agent  has not  been  appointed  and has not
          accepted  its  duties  within  [90] days of the Debt  Warrant  Agent's
          notice of  resignation,  the Debt Warrant Agent may apply to any court
          of competent  jurisdiction  for the  designation  of a successor  Debt
          Warrant  Agent.  The  obligations  of the Company under Section 5.2(a)
          shall  continue to the extent set forth  therein  notwithstanding  the
          resignation or removal of the Debt Warrant Agent.

     (c)  In case at any time the Debt Warrant Agent shall  resign,  or shall be
          removed,  or shall become incapable of acting,  or shall be adjudged a
          bankrupt or insolvent,  or shall file a petition  seeking relief under
          Title 11 of the United  States Code, as now  constituted  or hereafter
          amended, or under any other applicable federal or state bankruptcy law
          or  similar  law,  or  make  an  assignment  for  the  benefit  of its
          creditors,  or consent to the  appointment  of a receiver or custodian
          for all or any  substantial  part of its  property,  or shall admit in
          writing its inability to pay or meet its debts as they mature, or if a
          receiver or custodian for it or for all or any substantial part of its
          property  shall be  appointed,  or if an order of any  court  shall be
          entered for relief  against it under the provisions of Title 11 of the
          United States Code, as now constituted or hereafter amended,  or under
          any other applicable federal or state bankruptcy or similar law, or if
          any public  officer  shall  have  taken  charge or control of the Debt
          Warrant  Agent  or of its  property  or  affairs  for the  purpose  of
          rehabilitation,  conservation or liquidation, a successor Debt Warrant
          Agent, qualified as aforesaid, shall be appointed by the Company by an
          instrument in writing,  filed with the successor  Debt Warrant  Agent.
          Upon the  appointment  as aforesaid of a successor  Debt Warrant Agent
          and   acceptance  by  the   successor   Debt  Warrant  Agent  of  such
          appointment,  the Debt Warrant Agent so  superseded  shall cease to be
          Debt Warrant Agent hereunder.

     (d)  Any successor Debt Warrant Agent  appointed  hereunder  shall execute,
          acknowledge  and  deliver  to its  predecessor  and to the  Company an
          instrument  accepting such appointment  hereunder,  and thereupon such
          successor  Debt  Warrant  Agent,  without  any  further  act,  deed or
          conveyance,  shall  become  vested  with  all the  authority,  rights,
          powers, trusts, immunities, duties and obligations of such predecessor
          with  like  effect  as if  originally  named  as  Debt  Warrant  Agent
          hereunder,  and such  predecessor,  upon  payment of its  charges  and
          disbursements  then  unpaid,   shall  thereupon  become  obligated  to
          transfer,  deliver and pay over, and such successor Debt Warrant Agent
          shall be entitled  to receive,  [the Debt  Warrant  Register  and] all
          monies,  securities and other property on deposit with or held by such
          predecessor (together with any books and records relating thereto), as
          Debt Warrant Agent hereunder.

     (e)  The Company  shall cause notice of the  appointment  of any  successor
          Debt  Warrant  Agent to be [if  registered  Debt  Warrants - mailed by
          first-class  mail,  postage  prepaid,  to each  Holder at its  address
          appearing  on the  Debt  Warrant  Register  or,  in the  case  of Debt
          Warrants that are issued with Offered Debt  Securities and cannot then
          be transferred separately therefrom,  on the security register for the
          Offered Debt  Securities]  [if bearer Debt  Warrants - published in an
          Authorized  Newspaper (as defined in Section 101 of the  Indenture) in
          The  City of New  York  and in such  other  city or  cities  as may be
          specified by the Company at least twice,  [the first such  publication
          to be not earlier than the earliest date and not later than the latest
          date  prescribed  for the giving such  notice].  Such notice shall set
          forth  the name and  address  of the  successor  Debt  Warrant  Agent.
          Failure to give any notice provided for in this Section 5.3(e), or any
          defect therein, shall not, however, affect the legality or validity of
          the appointment of the successor Debt Warrant Agent.

     (f)  Any  corporation  into which the Debt Warrant  Agent  hereunder may be
          merged or converted,  or any  corporation  with which the Debt Warrant
          Agent  may be  consolidated,  or any  corporation  resulting  from any
          merger,  conversion or  consolidation  to which the Debt Warrant Agent
          shall be a party,  or any  corporation to which the Debt Warrant Agent
          shall  sell or  otherwise  transfer  all or  substantially  all of its
          assets and business, provided that such Corporation shall be qualified
          as  aforesaid,  shall be the  successor  Debt Warrant Agent under this
          Agreement  without the execution or filing of any paper, the giving of
          any notice to Holders or any  further  act on the part of the  parties
          hereto.

     Section 5.4 Compliance With Applicable  Laws. The Debt Warrant Agent agrees
to comply with all applicable federal and state laws imposing  obligations on it
in respect of the services  rendered by it under this Debt Warrant Agreement and
in  connection  with the Debt  Warrants,  including  (but  not  limited  to) the
provisions  of United  States  federal  income  tax laws  regarding  information
reporting and backup  withholding.  The Debt Warrant Agent expressly assumes all
liability for its failure to comply with any such laws imposing  obligations  on
it,  including (but not limited to) any liability for failure to comply with any
applicable  provisions  of  United  States  federal  income  tax laws  regarding
information reporting and backup withholding.

     Section 5.5 Office.  The Company  will  maintain an office or agency  where
Debt Warrant  Certificates may be presented for exchange,  transfer or exercise.
The office  initially  designated for this purpose shall be the corporate  trust
office of the Debt Warrant Agent at _____________.

                                   ARTICLE VI

                                  MISCELLANEOUS

     Section  6.1  Consolidation  or Merger of the  Company  and  Conveyance  or
Transfer Permitted Subject to Certain Conditions. To the extent permitted in the
Indenture, the Company may consolidate with or merge into another corporation or
other entity,  or convey or transfer all or substantially  all of its properties
and assets to any other corporation or other entity.

     Section 6.2 Rights and Duties of Successor Corporation. In case of any such
consolidation,  merger,  conveyance  or transfer and upon any  assumption of the
duties  and  obligations  of the  Company  by the  successor  corporation,  such
successor  corporation shall succeed to and be substituted for the Company, with
the same  effect  as if it had  been  named  herein,  and the  Company  shall be
relieved of any further  obligation  under this Agreement and the Debt Warrants.
Such  successor  corporation  thereupon  may cause to be  signed,  and may issue
either  in its  own  name  or in the  name  of  the  Company,  any or all of the
Underlying  Debt  Securities  issuable  pursuant  to the terms  hereof.  All the
Underlying  Debt  Securities so issued shall in all respects have the same legal
rank  and  benefit  under  the  Indenture  as  the  Underlying  Debt  Securities
theretofore or thereafter  issued in accordance with the terms of this Agreement
and the Indenture.

                  In case of any such consolidation, merger, conveyance or
transfer, such changes in phraseology and form (but not in substance) may be
made in the Underlying Debt Securities thereafter to be issued as may be
appropriate.

     Section  6.3  Supplements  and  Amendments.  (a) The  Company  and the Debt
Warrant Agent may from time to time  supplement or amend this Agreement  without
the approval or consent of any Holder in order to cure any ambiguity, to correct
or  supplement  any  provision   contained  herein  that  may  be  defective  or
inconsistent  with any other provision herein, or to make any other provision in
regard to matters or questions  arising  hereunder that the Company and the Debt
Warrant  Agent may deem  necessary  or  desirable  and that shall not  adversely
affect the  interests of the Holders.  Every  Holder of Debt  Warrants,  whether
issued before or after any such supplement or amendment, shall be bound thereby.
Promptly after the effectiveness of any supplement or amendment that affects the
interests of the Holders,  the Company shall give notice thereof, as provided in
Section 5.3(d) hereof, to the Holders affected thereby, setting forth in general
terms the substance of such supplement or amendment.

     (b)  The  Company  and the Debt  Warrant  Agent may  modify  or amend  this
          Agreement  and the Debt Warrant  Certificates  with the consent of the
          Holders  of not  fewer  than a  majority  in  principal  amount of the
          underlying Debt Securities  represented by the Debt Warrants  affected
          by such modification or amendment, for any purpose; provided, however,
          that no such  modification  or amendment  that  shortens the period of
          time during  which the Debt  Warrants may be  exercised,  or otherwise
          materially and adversely affects the exercise rights of the Holders or
          reduces the  percentage  of Holders of  outstanding  Debt Warrants the
          consent of which is required  for  modification  or  amendment of this
          Agreement  or the Debt  Warrants,  may be made  without the consent of
          each Holder affected thereby.

     Section 6.4 Notices and Demands to the Company and Debt Warrant  Agent.  If
the Debt  Warrant  Agent  shall  receive any notice or demand  addressed  to the
Company by a Holder  pursuant  to the  provisions  of this  Agreement  or a Debt
Warrant Certificate (other than notices relating to the exchange[,  transfer] or
exercise of Debt Warrants),  the Debt Warrant Agent shall promptly  forward such
notice or demand to the Company.

     Section  6.5  Addresses.  Any  communications  from the Company to the Debt
Warrant   Agent  with   respect  to  this   Agreement   shall  be   directed  to
____________________,  Attention:  ____________________,  and any communications
from the Debt Warrant Agent to the Company with respect to this Agreement  shall
be directed to KeySpan Corporation,  One Metro Tech Center,  Brooklyn,  New York
11202,  Attention:  _______________________  (or such other  address as shall be
specified  in writing by the Debt Warrant  Agent or by the Company,  as the case
may be).

     Section 6.6  Applicable  Law. This Agreement and the Debt Warrants shall be
governed by and construed in accordance with the laws of the State of New York.

     Section 6.7  Delivery of  Prospectus.  The Company will furnish to the Debt
Warrant Agent sufficient copies of a prospectus or prospectuses  relating to the
Underlying Debt  Securities  deliverable  upon exercise of any outstanding  Debt
Warrants (each a "Prospectus"),  and the Debt Warrant Agent agrees to deliver to
the Holder of a Debt Warrant,  prior to or concurrently with the delivery of the
Underlying  Debt  Securities  issued upon the  exercise  thereof,  a copy of the
Prospectus relating to such Underlying Debt Securities.

     Section 6.8  Governmental  Approvals.  The Company will take such action as
may be necessary to obtain and keep effective any and all permits,  consents and
approvals of governmental  agencies and  authorities,  and will make all filings
under federal and state  securities laws  (including,  without  limitation,  the
maintenance of the  effectiveness of a registration  statement in respect of the
Underlying  Debt  Securities  under the  Securities  Act of 1933),  as may be or
become requisite in connection with the issuance, sale, transfer and delivery of
Debt Warrants and Debt Warrant  Certificates,  the exercise of Debt Warrants and
the  issuance,  sale and  delivery of  Underlying  Debt  Securities  issued upon
exercise of Debt Warrants.

     Section 6.9 Persons Having Rights under Debt Warrant Agreement.  Nothing in
this Agreement,  expressed or implied, and nothing that may be inferred from any
of the  provisions  hereof is intended or shall be  construed  to confer upon or
give to any person or corporation other than the Company, the Debt Warrant Agent
and the Holders any right,  remedy or claim under or by reason of this Agreement
or any covenant,  condition,  stipulation,  promise or agreement herein; and all
covenants, conditions, stipulations, promises and agreements herein shall be for
the sole and exclusive benefit of the Company,  the Debt Warrant Agent and their
respective successors and the Holders.

     Section 6.10 Headings. The descriptive headings of the several Articles and
Sections of this  Agreement  are  inserted  for  convenience  only and shall not
control or affect the meaning or construction of any of the provisions hereof.

     Section 6.11  Counterparts.  This  Agreement may be executed in one or more
counterparts, each of which when so executed and delivered shall be deemed to be
an original;  but all such counterparts  taken together shall constitute one and
the same agreement.

     Section 6.12  Inspection of Agreement.  A copy of this  Agreement  shall be
available  during  business  hours at the office of the Debt  Warrant  Agent for
inspection  by any Holder.  The Debt  Warrant  Agent may require  such Holder to
submit its Debt Warrant  Certificate  for  inspection  prior to making such copy
available.

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

                                                      KEYSPAN CORPORATION
[Seal]

                                                    By__________________________
Attest:                                               Name and Title:


- -----------------------------------
Name and Title

[Seal]
                                                    By__________________________

Attest:
                                                    Name and Title:

- -----------------------------------
Name and Title












                                    Exhibit A
                                       to
                 [Senior] [Subordinated] Debt Warrant Agreement
                             dated as of __________



                      [Compensation of Debt Warrant Agent]