EXHIBIT 10(p)

                                  AMENDMENT TO
                          NATIONAL GRID USA COMPANIES'
                     EXECUTIVE SUPPLEMENTAL RETIREMENT PLAN

      Pursuant to the provisions of the National Grid USA Companies' Executive
Supplemental Retirement Plan (the Supplemental Plan) said Supplemental Plan is
hereby amended as of February 1, 2002 as follows:

      A second paragraph shall be added to Section 1.04 "Qualifications and
      Effect" and shall read:

      All benefits under Eastern Utilities Associate's Supplemental Retirement
      Plan for Certain Officers of Eastern Utilities Associates and its
      Affiliated Companies and the Retirement Restoration Plan for Members of
      the Employee's Retirement Plan of Eastern Utilities Associates and its
      subsidiary Companies (together referred to as the EUA Plans) were frozen
      as of April 30, 2000. Benefit calculation methodology for former Eastern
      Utility Associate employees who became National Grid employees and
      Participants in the Supplemental Plan as of May 1, 2000 or thereafter is
      set forth in Appendix C, a copy of which is attached hereto and
      incorporated by reference as if fully set forth herein.

      A third paragraph shall be added to Section 1.04 "Qualification and
      Effect" and shall read:

      Niagara Mohawk Supplemental Executive Retirement Plan (NIMO SERP) shall be
      merged and incorporated into the Supplemental Plan, effective February 1,
      2002. All benefit accruals under the NIMO SERP shall be frozen as of
      January 31, 2002. Except as set forth in Appendix C, inconsistent
      provisions between the NIMO SERP and the Supplemental Plan shall be
      controlled by the terms of the Supplemental Plan. The benefit calculation
      and methodology for NIMO SERP participants, including those who become
      National Grid employees on or after January 31, 2002 and meet Supplemental
      Plan eligibility requirements necessary to accrue additional benefits is
      set forth in Appendix C.

      Section 2.18 "Level E Participant" is amended to read:

      Level E Participant means any Participant who is specially designated such
      by the CEO in Appendix B, a copy of which is attached hereto and
      incorporated by reference as if fully set forth herein, notwithstanding
      the fact that he/she would otherwise have qualified as a Level A, B, or C
      Participant.

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      Section 2.2.2 "Qualified Compensation" is amended to read:

      Qualified Compensation means compensation utilized in the calculation of
      the Participant's Qualified Plan benefit, without regard to any reduction
      required by Section 4.01(a)(17) of the Code; provided, however, Qualified
      Compensation shall include additional earnings received by a Participant
      from any entity as specifically authorized by the CEO. Effective April 1,
      2003 future deferrals under the National Grid USA Companies Deferred
      Compensation Plan will be included under this Section 2.22 for
      Supplemental Plan Participants who accrue benefits on or after said date.

      A new Section 5.04 "Cash Out" shall be added to Article 5.0 and shall read
      as follows:

      In the event that a Participant has a benefit under the Supplemental Plan
      with a value of less than ten thousand dollars ($10,000), determined
      utilizing the interest rate and mortality assumptions applicable for
      determining five thousand dollar ($5,000) cash outs under the Qualified
      Plan, the benefit shall automatically be paid out in the form of a lump
      sum distribution at retirement. In the event that FICA taxes are due on
      Supplemental Plan benefits commencing upon retirement, unless the
      Participant elects to pay FICA taxes due at retirement on said
      Supplemental Plan benefit out of pocket, to the extent permitted by law,
      the taxes will be paid through an actuarial reduction in the Participant's
      benefit in an amount sufficient to cover a lump sum payment of the FICA
      taxes and applicable withholding taxes.

      Appendix A shall be titled "Level D Participants".

      A new "Appendix B" shall be added to the Supplemental Plan and shall read
      as f follows:

      Appendix B - Level E Participants

      For purposes of the Supplemental Plan, William E. Davis shall be
      considered a Level B Participant.

      For purposes of Sections 2.22 and 3.01 of the Supplemental Plan, Thomas E.
      Rogers and Charles H. Moser shall be deemed Level B Participants. For all
      other purposes they shall be deemed Level C Participants.

      A new "Appendix C" shall be added to the Supplemental Plan and shall read
      as follows:
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      Appendix C - Merger Transferees

      Supplemental Plan Participants who were former Eastern Utility Associate
      employees and who became Participants in the Supplemental Plan effective
      May 1, 2000 or thereafter, shall have their benefits calculated under the
      Supplemental Plan through April 30, 2000 utilizing eligible pay and
      service credited through April 30, 2000 under the terms of EUA's Plans,
      which pay and service shall be utilized in the final calculation of their
      Supplemental Plan benefit. Accruals commencing May 1, 2000 and thereafter
      shall be calculated in accordance with the terms of the Supplemental Plan.
      Notwithstanding the foregoing, said Participant's final Supplemental Plan
      benefit shall be reduced by the frozen benefit payable under the EUA Plans
      for accruals up through April 30, 2000.

      NIMO SERP Participants whose benefits were frozen as of January 31, 2002
      and who are not eligible for benefit accruals under the terms of the
      Supplemental Plan on or after February 1, 2002, shall have their benefits
      paid in accordance with the terms of the NIMO SERP. Participants who were
      former Niagara Mohawk Power Company or Niagara Mohawk Holdings Inc.
      employees who become Participants in the Supplemental Plan for purposes of
      accruing benefits at anytime on or after February 1, 2002, shall in lieu
      of the NIMO SERP benefit, have their Supplemental Plan benefit calculated
      under the terms of the Supplemental Plan utilizing eligible pay and
      service credited under the terms of the NIMO SERP through January 31, 2002
      with accruals thereafter made strictly under the terms of the Supplemental
      Plan. In the event, however, a Participant received a partial or total
      lump sum payment under the NIMO SERP said Participant's Supplemental Plan
      benefit will be offset by the annuity value of such lump sum payment(s),
      determined in accordance with the actuarial equivalence factors defined in
      the Qualified Plan. A Participant's final Supplemental Plan benefit shall
      be no less than the frozen benefit determined under the NIMO SERP as of
      January 31, 2002 reduced by any previously received lump sum.

                                                      /s/ Richard P. Sergel
                                                      ------------------------
                                                      Chief Executive Officer
                                                      National Grid USA

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                    Amendment to National Grid USA Companies'
                     Executive Supplemental Retirement Plan

      Pursuant to the provisions of Article XIV of the National Grid USA
Companies" Executive Supplemental Retirement Plan (Supplemental Plan), it is
hereby amended effective August 1, 2003 to recognize that any pension benefit
enhancement provided pursuant to the terms of any of the below listed voluntary
early retirement offers that cannot be delivered under the Qualified Plan or the
Niagara Mohawk Pension Plan, as applicable, due to any legal limits applicable
to such plans, including, but not limited to, Section 4.01(a)(17), Section 414
or Section 415 of the Code, shall be delivered to the participant through the
Supplemental Plan, subject to any legal limits that apply to the Supplemental
Plan. Further, the terms of said voluntary early retirement offers shall apply
to Level A and Level B Participants under applicable provisions of the
Supplemental Plan, except to the extent they may relate to the CEO, whose
Supplemental Plan benefit shall not increase as a result of the terms of any
applicable Qualified Plan voluntary early retirement offer.

            -     National Grid USA Companies' 2003 Group 1 Voluntary Early
                  Retirement Offer For Eligible Non-Union Employees

            -     National Grid USA Companies' 2003 Group 2 Voluntary Early
                  Retirement Offer For Eligible Non-Union Employees

            -     National Grid USA Companies' Limited Voluntary Early
                  Retirement Offer For Non-Union Employees

            -     National Grid USA Companies' 2003 Voluntary Early Retirement
                  Offer For Eligible Non-Union Employees Who Participate In The
                  Niagara Mohawk Pension Plan

By: /s/ Richard P. Sergel
    ---------------------
Richard P. Sergel
Chief Executive Officer
National Grid USA

Witnessed By: /s/ Lawrence J. Reilly
              ----------------------


                    Amendment to National Grid USA Companies'
                     Executive Supplemental Retirement Plan

      Pursuant to the provisions of Article XIV of the National Grid USA
Companies' Executive Supplemental Retirement Plan, said Plan is hereby amended
effective September 1, 2003 as follows:

      1.    Section 2.05 is amended to read:

            2.05  A Change in Control shall be deemed to have occurred if the
                  conditions set forth in any of the following paragraphs shall
                  have been satisfied:

                  (a)   any Person or Persons in concert obtains Control (as
                        defined in Section 840 of the United Kingdom's Income
                        and Corporation Taxes Act 1988) of National Grid Transco
                        plc as a result of making a general offer to acquire
                        shares in National Grid Transco plc or having obtained
                        Control, makes such an offer;

                  (b)   the consummation of the sale or disposition by National
                        Grid Transco plc of National Grid USA to a
                        non-affiliated entity (whether by merger, sale of all or
                        substantially all of the capital stock or assets of
                        National Grid USA or otherwise);

                  (c)   the complete liquidation, dissolution or winding up of
                        National Grid Transco plc and/or of National Grid USA;
                        or

                  (d)   the acquisition by National Grid Transco plc or National
                        Grid USA or their successors of all or substantially all
                        of the assets of or ownership of all or substantially
                        all of the outstanding shares of a U.S. electric and/or
                        gas utility company which would increase the size or
                        revenues of National Grid USA by 25% or more.

                              A Change in Control shall not be deemed to have
                        occurred if the events referred to above are part of an
                        arrangement ("a Reorganization") which will mean that
                        National Grid Transco plc and/or National grid USA will
                        be under the Control of another company or the business
                        of National Grid Transco plc is carried on by another
                        company, and the Persons who owned the shares in
                        National Grid Transco plc immediately before the Change
                        in Control will immediately afterwards own more than 50%
                        of the shares in that other company.



      2.    Section 2.19 is amended to read:

            2.19  A Major Transaction shall be deemed to have occurred if the
                  conditions set forth in any one of the following paragraphs
                  shall have been satisfied:

            (a)   any Person becomes bound or entitled to acquire shares in
                  National Grid Transco plc under Sections 428 to 430F of the
                  United Kingdom's Companies Act 1985, or a scheme of
                  arrangement or compromise under Section 425 of the United
                  Kingdom's Companies Act 1985 is proposed for National Grid
                  Transco plc;

            (b)   National Grid Transco plc shareholders, National Grid USA's
                  shareholders and/or the Board of Directors of National Grid
                  USA approve the sale of National Grid USA to a non-affiliated
                  entity (whether by merger, sale of all or substantially all of
                  the capital stock or assets of National Grid USA, or
                  otherwise);

            (c)   National Grid Transco plc passes a resolution for voluntary
                  winding up, or an order is made for the compulsory winding up
                  of National Grid Transco plc and/or National Grid USA;

            (d)   the shareholders of National Grid Transco plc, the
                  shareholders of National Grid USA and/or the Board of
                  Directors of National Grid USA approve an event the
                  consummation of which would result in the occurrence of a
                  Change in Control; or

            (e)   the Board of Directors of National Grid Transco plc adopts a
                  resolution that, for purposes of this Agreement, a Major
                  Transaction has occurred.

                        A Major Transaction shall not be deemed to have occurred
                  if the events referred to above are part of an arrangement ("a
                  Reorganization") which will mean that National Grid Transco
                  plc and/or National Grid USA will be under the Control of
                  another company or the business of National Grid Transco plc
                  is carried on by another company, and the Persons who owned
                  the shares in National Grid Transco plc immediately before the
                  series of transactions are consummated will immediately after
                  consummation own more than 50% of the shares in that other
                  company.

                                                    By: /s/ Richard P. Sergel
                                                        ------------------------
                                                        Chief Executive Officer
                                                        National Grid USA

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