Exhibit 4.20






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                               KEYSPAN CORPORATION

                                       and

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

                               Stock Warrant Agent

                                     FORM OF

                            STOCK WARRANT AGREEMENT*

                        Dated as of ______________, ____

                                       FOR

                            UP TO ___ STOCK WARRANTS

                           EXPIRING ___________, _____




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














                                Table of Contents



                                    ARTICLE I


                  ISSUANCE OF STOCK WARRANTS AND EXECUTION AND
                        DELIVERY OF WARRANT CERTIFICATES
                                                                                                          
Section 1.1    Issuance of Stock Warrants.........................................................................1

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

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

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

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

Section 1.6    "Holder"...........................................................................................3

                                   ARTICLE II

                     DURATION AND EXERCISE OF STOCK WARRANTS

Section 2.1    Duration of Stock Warrants.........................................................................4

Section 2.2    Exercise of Stock Warrants.........................................................................4

Section 2.3    Stock Warrant Adjustments..........................................................................5

                                   ARTICLE III

                         OTHER PROVISIONS RELATING TO RIGHTS OF HOLDERS OF STOCK WARRANTS

Section 3.1    No Rights as Holder of Underlying [Preferred/Common] Shares Conferred by
                              Stock Warrants or Warrant Certificates..............................................5

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

Section 3.3    Holders of Stock Warrants May Enforce Rights.......................................................6

Section 3.4    Merger, Consolidation, Sale, Transfer or Conveyance................................................6

                                   ARTICLE IV

                     EXCHANGE AND TRANSFER OF STOCK WARRANTS

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

Section 4.2    Treatment of Holders of Warrant Certificates.......................................................8

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

                                    ARTICLE V

                          CONCERNING THE WARRANT AGENT

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

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

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

Section 5.4    Compliance With Applicable Laws...................................................................11

Section 5.5    Office............................................................................................11

                                   ARTICLE VI

                                  MISCELLANEOUS

Section 6.1    Supplements and Amendments........................................................................12

Section 6.2    Notices and Demands to the Company and Warrant Agent..............................................12

Section 6.3    Addresses for Notices.............................................................................12

Section 6.4    Governing Law.....................................................................................12

Section 6.5    Governmental Approvals............................................................................12

Section 6.6    Persons Having Rights Under Stock Warrant Agreement...............................................13

Section 6.7    Delivery of Prospectus/Prospectus Supplement......................................................13

Section 6.8    Headings..........................................................................................13

Section 6.9    Counterparts......................................................................................13

Section 6.10    Inspection of Agreement..........................................................................13

Section 6.11    Consolidation, Merger or Amalgamation of the Company and Conveyance or
                                Transfer Permitted Subject to Certain Conditions.................................13

Section 6.12    Rights and Duties of Successor Corporation.......................................................13













                  This STOCK WARRANT AGREEMENT, dated as of __________________,
between KeySpan Corporation, a New York Corporation (the "Company"), and
_______________, a ________________ organized and existing under the laws of
________________ (the "Warrant Agent").

                  WHEREAS, the Company proposes to sell certificates evidencing
one or more warrants (the " Stock Warrants" or, individually, a " Stock
Warrant") representing the right to purchase [common stock, par value $0.01 per
share, of the Company (the "Common Shares")] [shares of a series of preferred
stock, par value $0.01 per share, of the Company (the "Preferred Shares")], such
warrant certificates and other warrant certificates issued pursuant to this
Agreement being herein called the "Warrant Certificates";

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

                  WHEREAS, the Company desires the Warrant Agent to act on
behalf of the Company, and the Warrant Agent is willing so to act in connection
with the issuance of the Warrant Certificates and other matters as provided
herein.

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

                                   ARTICLE I

                  ISSUANCE OF STOCK WARRANTS AND EXECUTION AND
                        DELIVERY OF WARRANT CERTIFICATES

     Section 1.1 Issuance of Stock  Warrants.  Stock Warrants may be issued from
time to time.  Prior to the  issuance  of any  Stock  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 Stock Warrants;

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

(c)  the  designation,   number  and  terms  (including  any  subordination  and
     conversion  provisions) of any Preferred  Shares that are purchasable  upon
     exercise of such Stock Warrants;]

(d)  the time or times at which,  or period or periods during which,  such Stock
     Warrants may be exercised  and the final date on which such Stock  Warrants
     may be exercised (the "Expiration Date");

(e)  the number of [Preferred/Common] Shares that may be purchased upon exercise
     of such Stock  Warrants;  the price, or the manner of determining the price
     (the  "Warrant  Price"),  at which  such  [Preferred/Common]  Shares may be
     purchased upon exercise of the Stock  Warrants;  and any minimum or maximum
     number of such Stock Warrants that are exercisable at any one time;

(f)  if applicable, any anti-dilution provisions of such Stock Warrants;

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

(h)  the terms of any right of the Company to accelerate the Expiration  Date of
     the Stock Warrants upon the occurrence of certain events; and

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

     Section  1.2 Form and  Execution  of  Warrant  Certificates.  (a) The Stock
Warrants  shall be  evidenced  by the  Warrant  Certificates,  which shall be in
registered form and  substantially in such form or forms as shall be established
by or pursuant to a Board Resolution. Each Warrant Certificate, whenever issued,
shall be dated the date it is  countersigned  by the Warrant  Agent and may have
such  letters,  numbers or other  marks of  identification  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
law or with any rule or  regulation  made  pursuant  thereto or with any rule or
regulation of any securities exchange on which the Stock 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 Warrant Certificate shall evidence one or more Stock Warrants.

     (b) The Warrant  Certificates  shall be signed in the name and on behalf of
the  Company  by its  Chairman  of the Board of  Directors,  its  President,  an
Executive Vice  President,  any Vice  President,  the Treasurer or any Assistant
Treasurer and by its Secretary or any Assistant  Secretary.  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  Warrant
Certificates,  subject to the Company's Bye-Laws as in effect from time to time.
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  Warrant
Certificates.

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

     (d) In case any  officer of the  Company  who shall have signed any Warrant
Certificate  either  manually or by facsimile  signature  shall cease to be such
officer before the Warrant  Certificate so signed shall have been  countersigned
and delivered by the Warrant Agent, such Warrant Certificate nevertheless may be
countersigned  and  delivered  as though  the person  who  signed  such  Warrant
Certificate  had not ceased to be such officer of the  Company;  and any Warrant
Certificate  may be signed on behalf of the  Company  by such  person as, at the
actual date of the  execution of such 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 Warrant Certificates.  At any time and
from time to time  after the  execution  and  delivery  of this  Agreement,  the
Company may deliver Warrant Certificates  executed by the Company to the Warrant
Agent for  countersignature.  Subject to the provisions of this Section 1.3, the
Warrant Agent shall thereupon  countersign and deliver such Warrant Certificates
to or upon the  written  request  of the  Company.  Subsequent  to the  original
issuance of a Stock Warrant Certificate  evidencing Stock Warrants,  the Warrant
Agent shall countersign a new Warrant Certificate evidencing such Stock Warrants
only if such Warrant  Certificate is issued in exchange or substitution  for one
or more  previously  countersigned  Warrant  Certificates  evidencing such Stock
Warrants or in connection with their transfer, as hereinafter provided.

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

     If  temporary  Warrant  Certificates  are issued,  the  Company  will cause
definitive Warrant Certificates to be prepared without unreasonable delay. After
the  preparation  of definitive  Warrant  Certificates,  the  temporary  Warrant
Certificates  shall be exchangeable  for definitive  Warrant  Certificates  upon
surrender of the temporary Warrant Certificates at the corporate trust office of
the 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
Warrant  Certificates,  the Company  shall  execute and the Warrant  Agent shall
countersign and deliver in exchange  therefor  definitive  Warrant  Certificates
representing  the same aggregate  number of Stock Warrants.  Until so exchanged,
the temporary Warrant Certificates shall in all respects be entitled to the same
benefits under this Agreement as definitive 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
Stock  Warrants  or 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 Warrant  Certificate  shall  mean the person or persons in whose
name such  Warrant  Certificate  shall  then be  registered  as set forth in the
Warrant  Register to be maintained by the Warrant Agent  pursuant to Section 4.1
for that purpose.

                                   ARTICLE II

                     DURATION AND EXERCISE OF STOCK WARRANTS

     Section 2.1 Duration of Stock Warrants. Each Stock 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  Warrant
Certificate  evidencing such Stock Warrant.  Each Stock 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 Stock 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 Stock
Warrants for such periods of time as it chooses. Whenever the Expiration Date of
the Stock Warrants is so extended, the Company shall at least [20] days prior to
the then  Expiration  Date  cause to be  mailed  to the  Warrant  Agent  and the
registered  Holders of the Stock  Warrants in accordance  with the provisions of
Section 6.3 hereof a notice stating that the  Expiration  Date has been extended
and setting forth the new Expiration  Date. No adjustment  shall be made for any
dividends on any  [Preferred/Common]  Shares issuable upon exercise of any Stock
Warrant.

     Section 2.2 Exercise of Stock  Warrants.  (a) The Holder of a Stock Warrant
shall have the right, at its option, to exercise such Stock Warrant and, subject
to subsection (f) of this Section 2.2, purchase the number of [Preferred/Common]
Shares provided for therein at the time or times or during the period or periods
referred to in Section 2.1 and specified in the Warrant  Certificate  evidencing
such Stock  Warrant.  No fewer than the minimum  number of Stock Warrants as set
forth in the Warrant  Certificate  may be  exercised  by or on behalf of any one
Holder at any one time.  Except as may be provided in a Warrant  Certificate,  a
Stock  Warrant may be exercised by  completing  the form of election to purchase
set forth on the reverse side of the Warrant Certificate,  by duly executing the
same, and by delivering  the same,  together with payment in full of the 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 Warrant Agent. Except as
may be  provided  in a  Warrant  Certificate,  the  date on which  such  Warrant
Certificate  and payment are received by the Warrant Agent as aforesaid shall be
deemed to be the date on which the Stock  Warrant is exercised  and the relevant
[Preferred/Common] Shares are issued.

     (b) Upon the  exercise of a Stock  Warrant,  the Company  shall issue to or
upon the order of the Holder of such Warrant, the  [Preferred/Common]  Shares to
which such Holder is  entitled,  registered,  in the case of  [Preferred/Common]
Shares in  registered  form,  in such name or names as may be  directed  by such
Holder.

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

     (d) The Warrant Agent shall deposit all funds  received by it in payment of
the Warrant  Price for Stock  Warrants 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  Warrant  Price for
Warrants is  received of the amount so  deposited  in its  account.  The Warrant
Agent shall promptly confirm such telephone advice in writing to the Company.

     (e) The Warrant Agent shall, from time to time, as promptly as practicable,
advise the Company of (i) the number of Stock  Warrants of each title  exercised
as provided herein,  (ii) the instructions of each Holder of such Stock Warrants
with respect to delivery of the  [Preferred/Common]  Shares issued upon exercise
of such Stock Warrants to which such Holder is entitled upon such exercise,  and
(iii) such other  information  as the Company  shall  reasonably  require.  Such
notice may be given by telephone to be promptly confirmed in writing.

     (f) The Company will pay all  documentary  stamp taxes  attributable to the
initial  issuance  of Stock  Warrants or to the  issuance of  [Preferred/Common]
Shares to the registered  Holder of such Stock  Warrants upon exercise  thereof;
provided,  however,  that 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  [Preferred/Common]
Shares;  and in the event that any such transfer is involved,  the Company shall
not be  required  to issue  any  [Preferred/Common]  Shares  (and  the  Holder's
purchase  of the  [Preferred/Common]  Shares  issued  upon the  exercise of such
Holder's Stock 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.

     Section 2.3 Stock Warrant Adjustments. The terms and conditions, if any, on
which the  exercise  price of and/or  the  number of  [Preferred/Common]  Shares
covered by a Stock Warrant are subject to  adjustments  will be set forth in the
Warrant  Certificate and in the Prospectus  Supplement  relating  thereto.  Such
terms may include the  adjustment  mechanism for the exercise  price of, and the
number of  [Preferred/Common]  Shares  covered by, a Stock  Warrant,  the events
requiring  such  adjustments,  the events upon which the Company may, in lieu of
making  such  adjustments,  make  proper  provisions  so that the  Holder,  upon
exercise of such Holder's Stock Warrant,  would be treated as if such Holder had
been a holder of the  [Preferred/Common]  Shares  received  upon such  exercise,
prior to the occurrence of such events, and provisions affecting exercise of the
Stock Warrants in the event of certain events  affecting the  [Preferred/Common]
Shares.

                                  ARTICLE III

                 OTHER PROVISIONS RELATING TO RIGHTS OF HOLDERS
                                OF STOCK WARRANTS

     Section  3.1 No Rights as Holder of  Underlying  [Preferred/Common]  Shares
Conferred  by Stock  Warrants  or Warrant  Certificates.  No Stock  Warrants  or
Warrant Certificates shall entitle the Holder to any of the rights,  preferences
and  privileges  of  a  holder  of  the  underlying  [Preferred/Common]  Shares,
including without  limitation,  any dividend,  voting,  redemption,  conversion,
exchange and liquidation rights.

     Section 3.2 Lost, Stolen, Destroyed or Mutilated Warrant Certificates. Upon
receipt by the Company and the Warrant Agent of evidence reasonably satisfactory
to them of the ownership of and the loss,  theft,  destruction  or mutilation of
any Warrant  Certificate  and of indemnity  (other than in  connection  with any
mutilated   Warrant   Certificates   surrendered   to  the  Warrant   Agent  for
cancellation)  reasonably  satisfactory to them, the Company shall execute,  and
Warrant Agent shall countersign and deliver,  in exchange for or in lieu of each
lost,  stolen,  destroyed  or  mutilated  Warrant  Certificate,  a  new  Warrant
Certificate  evidencing a like number of Stock Warrants of the same title.  Upon
the issuance of a new 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 Warrant  Agent) in connection
therewith.  Every substitute Warrant Certificate executed and delivered pursuant
to this  Section in lieu of any lost,  stolen or destroyed  Warrant  Certificate
shall  represent a contractual  obligation  of the Company,  whether or not such
lost, stolen or destroyed  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 Warrant  Certificates,  duly executed and
delivered hereunder, evidencing Stock 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 Warrant Certificates.

     Section 3.3 Holders of Stock Warrants May Enforce  Rights.  Notwithstanding
any of the provisions of this Agreement,  any Holder may, without the consent of
the Warrant  Agent,  enforce and may institute and maintain any suit,  action or
proceeding against the Company suitable to enforce,  or otherwise in respect of,
its right to exercise his Stock  Warrants as provided in the Stock  Warrants and
in this Agreement.

     Section 3.4 Merger,  Consolidation,  Sale,  Transfer or Conveyance.  (a) In
case any of the following shall occur while any Stock Warrants are  outstanding:
(i) any reclassification or change of the outstanding [Preferred/Common] Shares;
or (ii) any  consolidation or merger to which the Company is party (other than a
consolidation or a merger in which the Company is the continuing corporation and
which does not result in any  reclassification of, or change in, the outstanding
[Preferred/Common]  Shares  issuable  upon exercise of the Stock  Warrants);  or
(iii) any sale,  conveyance or lease to another  corporation  of the property of
the Company as an entirety or substantially as an entirety; then the Company, or
such  successor  or  purchasing  corporation,  as the  case may be,  shall  make
appropriate  provision by  amendment of this  Agreement or otherwise so that the
Holders of the Stock Warrants then outstanding  shall have the right at any time
thereafter,  upon  exercise of such Stock  Warrants,  to  purchase  the kind and
amount of capital shares and other securities and property  receivable upon such
a reclassification,  change, consolidation, merger, sale, conveyance or lease as
would be  received  by a  holder  of the  number  of  [Preferred/Common]  Shares
issuable  upon  exercise  of  such  Stock  Warrant  immediately  prior  to  such
reclassification, change, consolidation, merger, sale, conveyance or lease, and,
in the case of a consolidation,  merger, sale,  conveyance or lease, the Company
shall  thereupon  be relieved of any further  obligation  hereunder or under the
Stock Warrants, and the Company as the predecessor  corporation may thereupon or
at any time thereafter be dissolved,  wound up or liquidated.  Such successor or
assuming  corporation  thereupon may cause to be signed, and may issue either in
its own name or in the name of the  Company,  any of all of the  Stock  Warrants
issuable  hereunder which theretofore shall not have been signed by the Company,
and may  execute  and  deliver  [Preferred/Common]  Shares in its own  name,  in
fulfillment  of its  obligations  to deliver  Shares upon  exercise of the Stock
Warrants.  All the Stock  Warrants so issued shall in all respects have the same
legal rank and benefit under this Agreement as the Stock Warrants theretofore or
thereafter  issued in accordance  with the terms of this Agreement as though all
of such Stock Warrants had been issued at the date of the execution  hereof.  In
any  case  of  any  such  reclassification,   change,   consolidation,   merger,
conveyance,  transfer or lease, such changes in phraseology and form (but not in
substance) may be made in the Stock  Warrants  thereafter to be issued as may be
appropriate.

     (b) If reasonably  requested by the Stock Warrant Agent,  the Stock Warrant
Agent shall receive a written  opinion of legal  counsel as conclusive  evidence
that  any  such  merger,  consolidation,  sale,  transfer,  conveyance  or other
disposition of substantially  all of the assets of the Company complies with the
provisions of this Section 3.4.

                                   ARTICLE IV

                     EXCHANGE AND TRANSFER OF STOCK WARRANTS

     Section  4.1  Stock  Warrant  Register;  Exchange  and  Transfer  of  Stock
Warrants.  The Warrant Agent shall maintain, at its corporate trust office or at
_________,  a register (the "Warrant  Register") in which,  upon the issuance of
Stock Warrants and, subject to such reasonable  regulations as the Warrant Agent
may  prescribe,  it  shall  register  Warrant  Certificates  and  exchanges  and
transfers thereof. The 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 Warrant Agent or at _________ Warrant Certificates
may be exchanged for one or more other Warrant Certificates  evidencing the same
aggregate  number of Stock Warrants of the same title,  or may be transferred in
whole or in part. A transfer  shall be  registered  upon  surrender of a Warrant
Certificate to the 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 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 Warrant  Certificate
shall be issued to the transferee. Whenever a Warrant Certificate is surrendered
for exchange or transfer, the Warrant Agent shall countersign and deliver to the
person  or  persons  entitled  thereto  one or more  Warrant  Certificates  duly
executed by the Company,  as so requested.  The Stock Warrant Agent shall not be
required to effect any exchange or transfer which will result in the issuance of
a Warrant  Certificate  evidencing  a fraction of a Stock  Warrant.  All Warrant
Certificates issued upon any exchange or transfer of a 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 Warrant  Certificate
surrendered for such exchange or transfer.

     No service  charge  shall be made for any  exchange  or  transfer  of Stock
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 Warrant  Certificates.  The Company and
the Warrant Agent may treat the  registered  Holder of a Warrant  Certificate as
the  absolute  Holder  thereof  for any  purpose  and as the person  entitled to
exercise the rights  represented by the Stock Warrants  evidenced  thereby,  any
notice to the contrary notwithstanding.

     Section 4.3  Cancellation  of Warrant  Certificates.  In the event that the
Company shall purchase, redeem or otherwise acquire any Stock Warrants after the
issuance thereof,  the Warrant  Certificate or Warrant  Certificates  evidencing
such Stock  Warrants  shall  thereupon be delivered to the Warrant  Agent and be
cancelled  by it. The Warrant  Agent  shall also cancel any Warrant  Certificate
(including any Warrant Certificate) delivered to it for exercise, in whole or in
part, or for exchange or transfer.  Warrant  Certificates  so cancelled shall be
delivered by the Warrant  Agent to the Company from time to time, or disposed of
in accordance with the instructions of the Company.

                                   ARTICLE V

                          CONCERNING THE WARRANT AGENT

     Section 5.1 Warrant Agent.  The Company hereby appoints  __________________
as Warrant Agent of the Company in respect of the Stock  Warrants upon the terms
and subject to the conditions set forth herein,  and  __________________  hereby
accepts such appointment.  The Warrant Agent shall have the powers and authority
granted to and conferred  upon it in the 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 the
Warrant  Certificates  are subject to and  governed by the terms and  provisions
hereof.

     Section 5.2 Conditions of Warrant  Agent's  Obligations.  The 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  Warrant  Agent  the  compensation  set  forth in  Exhibit  A hereto  and to
reimburse the Warrant Agent for  reasonable  out-of-pocket  expenses  (including
counsel  fees)  incurred by the Warrant  Agent in  connection  with the services
rendered  hereunder by the Warrant  Agent.  The Company also agrees to indemnify
the 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
Warrant Agent arising out of or in connection  with its  appointment,  status or
service as Warrant Agent hereunder.

     (b) Agent for the Company. In acting under this Agreement and in connection
with any Warrant Certificate, the 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 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 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 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 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,  the Treasurer, an Assistant Treasurer,  the Secretary
or an Assistant Secretary of the Company (an "Officer's  Certificate") delivered
by the Company to the Warrant Agent.

     (f) Actions Through Agents.  The 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 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 Warrant Agent, and any officer,  director or
employee thereof, may become the owner of, or acquire any interest in, any Stock
Warrant,  with the same  rights that he, she or it would have if it were not the
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  [Preferred/Common]  Shares or other obligations of the Company as
if it were not the Warrant Agent.

     (h) No Liability  For  Interest.  The 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 Warrant Certificates, except as otherwise
agreed with the Company.

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

     (j) No Responsibility For Company Representations.  The 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 Warrant  Agent or
action taken or to be taken by it) or in any Warrant  Certificate  (except as to
the Warrant Agent's countersignature on such Warrant Certificate),  all of which
recitals and representations are made solely by the Company.

     (k) No Implied Obligations. The 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  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 Warrant Agent shall not be accountable or
under  any duty or  responsibility  for the use by the  Company  of any  Warrant
Certificate  countersigned  by the  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 Stock Warrants.  The 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 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 6.2 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 Stock Warrants, that there
shall at all times be a Warrant Agent hereunder until all the Stock Warrants are
no longer exercisable.

     (b) The  Warrant  Agent may at any time  resign  as such by giving  written
notice to the  Company,  specifying  the date on which its  desired  resignation
shall become effective; provided that such date shall not be less than [90] days
after the date on which such notice if given unless the Company agrees to accept
a shorter notice.  The 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 upon the  appointment  by the Company,  as hereinafter
provided,  of a successor  Warrant  Agent (which shall be a banking  institution
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 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  Warrant
Agent. In the event a successor Warrant Agent has not been appointed and has not
accepted  its  duties  within  [90]  days  of  the  Warrant  Agent's  notice  of
resignation,  the Warrant Agent may apply to any court of competent jurisdiction
for the designation of a successor Warrant Agent. The obligations of the Company
under  Section   5.02(a)  shall   continue  to  the  extent  set  forth  therein
notwithstanding the resignation or removal of the Warrant Agent.

     (c) In case at any  time  the  Warrant  Agent  shall  resign,  or  shall be
removed,  or shall become incapable of acting,  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 of 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 of it or 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 Warrant Agent or of its property or affairs,  for
the purpose of rehabilitation,  conservation or liquidation, a successor Warrant
Agent,  qualified  as  aforesaid,  shall  be  appointed  by  the  Company  by an
instrument  in  writing,  filed  with  the  successor  Warrant  Agent.  Upon the
appointment  as aforesaid of a successor  Warrant  Agent and  acceptance  by the
latter of such  appointment,  the Warrant Agent so superseded  shall cease to be
Warrant Agent hereunder.

     (d)  Any  successor  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  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  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  Warrant  Agent  shall be  entitled  to receive  all moneys,
securities  and other property on deposit with or held by such  predecessor,  as
Warrant Agent hereunder.

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

     Section 5.4 Compliance  With  Applicable  Laws. The 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  Warrant  Agreement  and in
connection  with  the  Stock  Warrants,  including  (but  not  limited  to)  the
provisions  of United  States  federal  income  tax laws  regarding  information
reporting  and backup  withholding.  The  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
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 Warrant Agent at ________________.

                                   ARTICLE VI

                                  MISCELLANEOUS

     Section 6.1 Supplements  and Amendments.  (a) The Company and 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 provisions  herein, or to make any other provision in regard to matters or
questions  arising  hereunder  that the Company  and the Warrant  Agent may deem
necessary or desirable and that shall not adversely  affect the interests of the
Holders. Every Holder of Stock 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 interest of the
Holders,  the  Company  shall give  notice  thereof,  as provided in Section 6.3
hereof,  to the Holders  affected  thereby,  setting  forth in general terms the
substance of such supplement or amendment.

     (b) The Company and the  Warrant  Agent may modify or amend this  Agreement
and the Warrant Certificates with the consent of the Holders of not fewer than a
majority in number of the underlying  [Preferred/Common] Shares 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
Stock Warrants may be exercised,  or otherwise  materially and adversely affects
the  exercise  rights of the  Holders or reduces  the  percentage  of Holders of
outstanding  Stock Warrants the consent of which is required for modification or
amendment  of this  Agreement  or the Stock  Warrants,  may be made  without the
consent of each Holder affected thereby.

     Section 6.2 Notices  and Demands to the Company and Warrant  Agent.  If the
Warrant Agent shall receive any notice or demand addressed to the Company by any
Holder pursuant to the provisions of the Warrant Certificates, the Warrant Agent
shall promptly forward such notice or demand to the Company.

     Section 6.3 Addresses for Notices.  Any communications  from the Company to
the Warrant Agent with respect to this Agreement  shall be addressed to [name of
Warrant Agent,  _______________,  Attention:  Corporate Trust  Department;]  any
communications  from the  Warrant  Agent to the  Company  with  respect  to this
Agreement  shall be  addressed to KeySpan  Corporation,  One  MetroTech  Center,
Brooklyn,  New York  11202,  attention  of  ___________________;  or such  other
addresses  as shall be  specified  in  writing  by the  Warrant  Agent or by the
Company, as the case may be.

     Section 6.4 Governing  Law. This  Agreement and the Stock Warrants shall be
governed by the laws of the State of New York.

     Section 6.5 Governmental Approvals.  The Company will from time to time use
all  reasonable  best efforts to obtain and keep  effective any and all permits,
consents and approvals of governmental agencies and authorities and the national
securities  exchange on which the Stock Warrants may be listed or authorized for
trading from time to time and will make all filings  under the federal and state
securities  laws  (including,   without  limitation,   the  maintenance  of  the
effectiveness of the registration statement in respect of the [Preferred/Common]
Shares  under the  Securities  Act of 1933),  as may be or become  requisite  in
connection with the issuance,  sale, trading,  transfer or delivery of the Stock
Warrants and Warrant  Certificates,  the exercise of the Stock  Warrants and the
issuance, sale and delivery of the underlying  [Preferred/Common]  Shares issued
upon the exercise of the Stock Warrants.

     Section 6.6 Persons Having Rights Under Stock 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 Warrant Agent and
the Holders any right,  remedy or claim under or by reason of this  Agreement or
of any covenant,  condition,  stipulation,  promise or agreement hereof; and all
covenants, conditions,  stipulations,  promises and agreements in this Agreement
contained  shall be for the sole and  exclusive  benefit of the  Company and the
Warrant  Agent and their  respective  successors  and of the  Holders of Warrant
Certificates.

     Section 6.7 Delivery of Prospectus/Prospectus  Supplement. The Company will
furnish to the  Warrant  Agent  sufficient  copies of a  prospectus,  prospectus
supplement or prospectuses relating to the [Preferred/Common] Shares deliverable
upon exercise of any outstanding Stock Warrants (each a "Prospectus"), and prior
to or concurrent with the delivery of the [Preferred/Common]  Shares issued upon
the exercise thereof, a copy of the Prospectus/Prospectus supplement relating to
such [Preferred/ Common] Shares.

     Section 6.8 Headings.  The descriptive headings of the several Articles and
Sections and the Table of Contents of this  Agreement are for  convenience  only
and shall not  control  or affect  the  meaning  or  construction  of any of the
provisions hereof.

     Section 6.9  Counterparts.  This  Agreement  may be executed by the parties
hereto  in any  number  of  counterparts,  each of which  when so  executed  and
delivered  shall be deemed to be an original;  but all such  counterparts  shall
together constitute but one and the same instrument.

     Section 6.10  Inspection of Agreement.  A copy of this  Agreement  shall be
available at all reasonable times at the principal corporate trust office of the
Warrant Agent, for inspection by the Holders of Stock Warrants.

     Section  6.11  Consolidation,  Merger or  Amalgamation  of the  Company and
Conveyance or Transfer  Permitted Subject to Certain  Conditions.  [If Preferred
Shares underlie Stock  Warrants--To  the extent  permitted in the Certificate of
Designations,  the  Company may  consolidate  with or merge or  amalgamate  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  6.12 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 Stock 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
Preferred  Shares  underlying  the Stock  Warrants and issuable  pursuant to the
terms hereof. All such Preferred Shares so issued shall in all respects have the
same legal rank and benefit as the Preferred  Shares  theretofore  or thereafter
issued in accordance  with the terms of this  Agreement and the  Certificate  of
Designations.

                  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 Preferred Shares thereafter to be issued as may be appropriate.

                                                              * * * * *

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

                                              KEYSPAN CORPORATION,
Seal

Attest:
                                              By: ______________________________
                                                    Name and Title
- ------------------------------
NAME AND TITLE:
                                              [STOCK WARRANT AGENT],
Seal

Attest:
                                              By: ______________________________
                                                    Name and Title
- ------------------------------
NAME AND TITLE:









                                    Exhibit A
                           to Stock Warrant Agreement

                         dated as of ____________, 200_


                         [Compensation of Warrant Agent]