NEW ENGLAND ELECTRIC SYSTEM
DEFM14A, 1999-03-29
ELECTRIC SERVICES
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<PAGE>


                                SCHEDULE 14A
                        Proxy Statement Pursuant to
           Rule 62 of the Public Utility Holding Company Act of 1935
            and Section 14(a) of the Securities Exchange Act of 1934
 
    Filed by the Registrant /X/
    Filed by a Party other than the Registrant / /
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, For Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    /X/  Definitive Proxy statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
 
                            New England Electric System
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required.

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11

    (1) Title of each class of securities to which transaction applies:

        common shares
        ------------------------------------------------------------------------
    (2) Aggregate number of securities to which transaction applies:

        59,355,248
        ------------------------------------------------------------------------
    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

        $54.35 (maximum price per share per Agreement and Plan of Merger dated
        as of December 11, 1998, by and among New England Electric System,
        The National Grid Group plc and NGG Holdings LLC)
        ------------------------------------------------------------------------
    (4) Proposed maximum aggregate value of transaction:

        $3,225,957,729
        ------------------------------------------------------------------------
    (5) Total fee paid:

        No fee paid pursuant to Section 14a-2(a)(5) of the Securities
        Exchange Act of 1934
        ------------------------------------------------------------------------

/ / Fee paid previously with preliminary materials.

/ / Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the form or schedule and the date of its filing.

    (1) Amount previously paid:

        ------------------------------------------------------------------------
    (2) Form, Schedule or Registration no.:

        ------------------------------------------------------------------------
    (3) Filing Party:

        ------------------------------------------------------------------------
    (4) Date Filed:

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

<PAGE>
                                     [LOGO]
 
                                                                  March 26, 1999
 
 Re: NEES Companies Incentive Thrift Plan I
    NEES Companies Incentive Thrift Plan II
    Yankee Thrift Plan
    Yankee Thrift Plan II
 
Dear NEES Shareholder:
 
    Under the thrift plans, NEES common shares are held by the trustee. As
beneficial owner of NEES common shares through one or more of the plans, you
have a right to direct the trustee how to vote at the 1999 New England Electric
System Annual Meeting of shareholders. Shareholders who own NEES common shares
directly vote through a proxy. Plan participants have a somewhat different
procedure. Included in this package is a voting instruction card on which you
instruct the trustee how to vote. Your share balance in each of the plans in
which you participate appears at the top of the enclosed voting instruction
card. Please note that all of the shares in the plans must be voted. Therefore,
the trustee will vote shares for which it does not receive instructions in the
same proportion as those for which it does.
 
    At the Annual Meeting, NEES's shareholders will be asked to:
 
    - amend the NEES Agreement and Declaration of Trust to authorize certain
      mergers and give related appraisal rights to shareholders,
 
    - vote on a proposal to approve a merger with The National Grid Group plc
      ("National Grid Group"), pursuant to the Agreement and Plan of Merger
      dated as of December 11, 1998 by and among NEES, National Grid Group and
      NGG Holdings LLC (formerly Iosta LLC),
 
    - elect directors, and
 
    - vote on a shareholder proposal if properly presented to the meeting.
 
    In the merger with The National Grid Group plc, each NEES shareholder will
receive
 
    - $53.75 IN CASH PER SHARE, PLUS UP TO AN ADDITIONAL $0.60 IN CASH PER SHARE
      if the merger does not take place within six months after NEES
      shareholders approve the merger, calculated at the rate of $0.003288 for
      each day the merger closing is delayed past the end of the six month
      period.
 
    The minimum price per share of $53.75 represents a premium of 25%, and the
maximum price per share of $54.35 represents a premium of 26.4%, in each case
over the closing price of $43.00 per share on December 11, 1998, which was the
last trading day prior to the public announcement of the merger. The merger
agreement is attached to the accompanying proxy statement as Appendix A.
 
    Like other shareholders, upon completion of the merger, thrift plan
participants will receive a cash payment for NEES shares. It is anticipated that
cash payments received by thrift plan participants will be invested within their
T. Rowe Price accounts in the investment option providing the most security to
its principal (currently the U.S. Treasury Fund). Participants would then be
able to redirect that investment to any other investment fund available at the
time. Participants will be provided more information on the timing and mechanics
for exercising the reinvestment options prior to completion of the merger.
 
    YOUR BOARD OF DIRECTORS UNANIMOUSLY:
 
    - APPROVED THE MERGER
 
    - BELIEVES THAT THE MERGER IS FAIR TO, AND IN THE BEST INTEREST OF, NEES AND
      ITS SHAREHOLDERS
<PAGE>
    - RECOMMENDS THAT YOU VOTE "FOR" APPROVAL OF THE MERGER
 
    As more fully explained in the accompanying proxy statement, NEES believes
that before the merger can take place, the NEES Agreement and Declaration of
Trust must be amended to include certain new provisions. Therefore, your Board
of Directors unanimously recommends that you vote FOR approval of the amendment
to the NEES Agreement and Declaration of Trust.
 
    As outlined on page 12 of the proxy statement, under the proposed amendment
shareholders will have rights of appraisal for their NEES shares. The thrift
plans give plan participants these same rights. The only difference is that a
plan participant wishing to preserve appraisal rights must give their advance
written notice of objection to the merger to T. Rowe Price, instead of NEES. Any
such notices should be addressed as follows: T. Rowe Price Retirement Plan
Service, P.O. Box 17215, Baltimore, MD 21203-7215, Attn.: New England Electric
Plan Service Team #25. Your thrift plan shares must also be voted against the
merger to preserve your appraisal rights, and you must follow the procedure set
forth in sections 87 to 98 inclusive of chapter 156B of the General Laws of
Massachusetts, which are attached to the enclosed proxy statement as Appendix D.
 
    The accompanying proxy statement provides detailed information concerning
the proposed amendment to the NEES Agreement and Declaration of Trust, the
proposed merger, the election of directors, and other matters.
 
    YOUR VOTE IS IMPORTANT.  Please take the time to review the proxy material,
complete your voting instruction card, and mail the card in the enclosed
envelope. YOUR VOTING INSTRUCTION WILL BE KEPT CONFIDENTIAL BY AN INDEPENDENT
PROXY TABULATOR. We appreciate all the support everyone has shown during this
period of great change in our industry.
 
Sincerely,
 
<TABLE>
<S>                                            <C>
               [LOGO]                          [LOGO]
 
Alfred D. Houston                              Richard P. Sergel,
Chairman                                       President and
of the Board                                   Chief Executive Officer
</TABLE>
<PAGE>
                                     [LOGO]
                                                                  March 26, 1999
 
Dear Shareholder:
 
    The directors and officers of New England Electric System ("NEES") invite
you to attend the Annual Meeting of shareholders to be held:
 
                             10:30 A.M., LOCAL TIME
                             ON MONDAY, MAY 3, 1999
 
                                 MECHANICS HALL
                                321 MAIN STREET
                            WORCESTER, MASSACHUSETTS
 
    At the Annual Meeting, NEES's shareholders will be asked to:
 
    - amend the NEES Agreement and Declaration of Trust to authorize certain
      mergers and give related appraisal rights to shareholders,
 
    - vote on a proposal to approve a merger with The National Grid Group plc
      ("National Grid Group"), pursuant to the Agreement and Plan of Merger
      dated as of December 11, 1998 by and among NEES, National Grid Group and
      NGG Holdings LLC (formerly Iosta LLC),
 
    - elect directors, and
 
    - vote on a shareholder proposal if properly presented to the meeting.
 
    In the merger with The National Grid Group plc, each NEES shareholder will
receive
 
    - $53.75 IN CASH PER SHARE, PLUS UP TO AN ADDITIONAL $0.60 IN CASH PER SHARE
      if the merger does not take place within six months after NEES
      shareholders approve the merger, calculated at the rate of $0.003288 for
      each day the merger closing is delayed past the end of the six month
      period.
 
    The minimum price per share of $53.75 represents a premium of 25%, and the
maximum price per share of $54.35 represents a premium of 26.4%, in each case
over the closing price of $43.00 per share on December 11, 1998, which was the
last trading day prior to the public announcement of the merger. The merger
agreement is attached to the accompanying proxy statement as Appendix A.
 
    YOUR BOARD OF DIRECTORS UNANIMOUSLY:
 
    - APPROVED THE MERGER
 
    - BELIEVES THAT THE MERGER IS FAIR TO, AND IN THE BEST INTEREST OF, NEES AND
      ITS SHAREHOLDERS
 
    - RECOMMENDS THAT YOU VOTE "FOR" APPROVAL OF THE MERGER
 
    As more fully explained in the accompanying proxy statement, NEES believes
that before the merger can take place, the NEES Agreement and Declaration of
Trust must be amended to include certain new provisions. Therefore, your Board
of Directors unanimously recommends that you vote FOR approval of the amendment
to the NEES Agreement and Declaration of Trust.
 
    The accompanying proxy statement provides detailed information concerning
the proposed amendment to the NEES Agreement and Declaration of Trust, the
proposed merger, the election of directors, and other matters. Please read it
carefully.
<PAGE>
    YOUR VOTE IS IMPORTANT.  Approval of the amendment to the NEES Agreement and
Declaration of Trust and the merger requires the affirmative vote of the holders
of a majority of the outstanding NEES common shares entitled to vote. If you
abstain from voting or fail to return your signed proxy, your action will have
the same effect as if you voted against the amendment to the NEES Agreement and
Declaration of Trust and the merger.
 
    Whether or not you plan to attend the meeting, please fill in, date, sign
and return your proxy promptly. Returning your completed proxy will not prevent
you from voting in person at the meeting. Please include a note with your
completed proxy if you would like to receive directions to the meeting and
information on parking arrangements.
 
Sincerely,
 
<TABLE>
<S>                                            <C>
               [LOGO]                          [LOGO]
 
Alfred D. Houston                              Richard P. Sergel
Chairman                                       President and Chief Executive Officer
</TABLE>
 
                                       2
<PAGE>
                          NEW ENGLAND ELECTRIC SYSTEM
                               25 Research Drive
                        Westborough, Massachusetts 01582
                            ------------------------
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 3, 1999
                            ------------------------
 
Dear Shareholders:
 
    The 1999 Annual Meeting of shareholders of New England Electric System
("NEES") will be held at:
 
                           10:30 A.M., LOCAL TIME, ON
                              MONDAY, MAY 3, 1999
                                 MECHANICS HALL
                                321 MAIN STREET
                            WORCESTER, MASSACHUSETTS
 
    You will be asked to:
 
    1.  Amend the NEES Agreement and Declaration of Trust to authorize certain
       mergers and give related appraisal rights to shareholders,
 
    2.  Approve the merger among NEES, The National Grid Group plc ("National
       Grid Group") and NGG Holdings LLC (formerly Iosta LLC, "NGG Holdings"),
       pursuant to the Agreement and Plan of Merger dated as of December 11,
       1998 by and among NEES, National Grid Group and NGG Holdings, in
       accordance with which NGG Holdings will merge with and into NEES and NEES
       will be the surviving entity in the merger,
 
    3.  Elect directors,
 
    4.  Vote on a shareholder proposal if properly presented to the meeting, and
 
    5.  Consider any other business that may properly come before the meeting or
       any adjournments.
 
    The merger agreement provides that each shareholder will receive $53.75 PER
SHARE IN CASH, PLUS UP TO AN ADDITIONAL $0.60 IN CASH PER SHARE if the merger
does not take place within six months after NEES shareholders approve the
merger, calculated at the rate of $0.003288 for each day the merger closing is
delayed past the end of the six month period.
 
    YOUR BOARD OF DIRECTORS UNANIMOUSLY:
 
    - APPROVED THE MERGER
 
    - BELIEVES THAT THE MERGER IS FAIR TO, AND IN THE BEST INTERESTS OF, NEES
      AND ITS SHAREHOLDERS
 
    - RECOMMENDS THAT YOU VOTE "FOR" APPROVAL OF THE MERGER
 
    Because the NEES Agreement and Declaration of Trust must be amended in order
to complete the merger, your Board of Directors also unanimously recommends that
you vote "FOR" approval of such amendment.
 
    Shareholders of record at the close of business on March 5, 1999 are
entitled to vote at the meeting or any adjournment.
 
    If the amendment to the NEES Agreement and Declaration of Trust and the
merger are approved by the shareholders at the meeting and the merger is
effected by NEES, any shareholder (1) who files
<PAGE>
with NEES, before the taking of the vote on the approval of the merger, written
objection to the merger stating that he or she intends to demand payment for his
or her shares at the appraisal value thereof instead of the amount payable in
the merger if the merger is completed and (2) whose shares are not voted in
favor of the merger, will have the right to demand in writing from NEES within
twenty days after the date of mailing to him or her of notice in writing that
the merger has become effective, payment for his or her shares at the appraisal
value thereof instead of the amount payable in the merger and an appraisal of
the value of such shares, which value may be equal to, more than or less than
the payment provided in the merger. NEES and such shareholder shall in such
cases have the rights and duties and shall follow the procedure set forth in
sections 88 to 98, inclusive, of Chapter 156B of the General Laws of
Massachusetts, which are attached to the enclosed proxy statement as Appendix D.
 
    WHETHER OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE FILL IN, SIGN, AND
DATE THE ENCLOSED PROXY AND PROMPTLY RETURN IT, IN THE POSTAGE-PAID RETURN
ENVELOPE PROVIDED, TO:
 
                          NEW ENGLAND ELECTRIC SYSTEM
                            c/o THE BANK OF NEW YORK
                                 P.O. BOX 11007
                         NEW YORK, NEW YORK 10203-0007
 
IN ORDER TO AVOID THE ADDITIONAL EXPENSE OF FURTHER SOLICITATION, WE ASK YOUR
COOPERATION IN MAILING YOUR PROXY PROMPTLY.
 
    IF YOU LATER DECIDE THAT YOU WILL ATTEND THE MEETING OR, FOR ANY OTHER
REASON, YOU DECIDE TO REVOKE OR CHANGE YOUR PROXY, YOU MAY DO SO AT ANY TIME
BEFORE IT IS VOTED.
 
                          PLEASE DO NOT SEND ANY SHARE
                       CERTIFICATES WITH YOUR PROXY CARD.
 
    Instructions on how to receive cash in the merger will be sent to you after
the merger has been completed. Because the merger requires regulatory approvals,
the merger will not be completed for some time after it is approved by NEES
shareholders.
 
                                          By Order of the Board of Directors,
 
                                                    [LOGO]
 
                                          Cheryl A. LaFleur
                                          Secretary
 
                                       2
<PAGE>
                          NEW ENGLAND ELECTRIC SYSTEM
                               25 RESEARCH DRIVE
                        WESTBOROUGH, MASSACHUSETTS 01582
 
                                                                  March 26, 1999
 
                                PROXY STATEMENT
                                      FOR
                         ANNUAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON MAY 3, 1999
 
    THIS PROXY STATEMENT IS BEING FURNISHED TO THE HOLDERS OF NEES COMMON
SHARES, IN CONNECTION WITH THE SOLICITATION OF PROXIES BY THE BOARD OF DIRECTORS
OF NEES FOR USE AT THE ANNUAL MEETING OF NEES SHAREHOLDERS TO BE HELD AT 10:30
A.M., LOCAL TIME, ON MONDAY, MAY 3, 1999 AT MECHANICS HALL, 321 MAIN STREET,
WORCESTER, MASSACHUSETTS, AND AT ANY ADJOURNMENT THEREOF.
 
    One of the purposes of the Annual Meeting is to consider and vote upon a
proposal to approve the merger among NEES, National Grid Group and NGG Holdings.
In the merger, each NEES shareholder will receive $53.75 per share in cash, plus
up to an additional $0.60 in cash per share if the merger does not take place
within six months after NEES shareholders approve the merger, calculated at the
rate of $0.003288 for each day the merger closing is delayed past the end of the
six month period (the "Merger Consideration").
 
    At the Annual Meeting, NEES shareholders will be asked to consider and vote
upon a proposal to amend the NEES Agreement and Declaration of Trust to
authorize certain mergers and give shareholders appraisal rights. This proposal
must be approved in order for the merger to take place.
 
    In addition, at the Annual Meeting, NEES shareholders will be asked to
consider and vote upon
 
    (1) the election of directors,
 
    (2) a shareholder proposal if properly presented to the meeting, and
 
    (3) any other business as may properly come before the meeting or any
       adjournments.
 
    NEES's annual report for 1998, which includes financial statements and a
summary of important developments during 1998, has been mailed to shareholders
on or about March 4, 1999. The approximate date on which the proxy statement and
form of proxy are first being sent is March 29, 1999.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS.................................................           1
 
QUESTIONS AND ANSWERS ABOUT THE NEES/NATIONAL GRID GROUP MERGER............................................           2
 
SUMMARY....................................................................................................           5
  The Companies............................................................................................           5
  The Annual Meeting.......................................................................................           5
  Record Date for Voting...................................................................................           6
  Voting...................................................................................................           6
  The Merger...............................................................................................           6
  What You Will Receive in the Merger......................................................................           6
  Payment for Shares.......................................................................................           7
  Timing for Completion of the Merger......................................................................           7
  Conditions to the Merger.................................................................................           7
  Background of the Merger.................................................................................           7
  Recommendation of the NEES Board.........................................................................           7
  Opinion of Financial Advisor.............................................................................           8
  Federal Income Tax Consequences..........................................................................           8
  Regulatory Matters.......................................................................................           8
  Shareholders' Rights of Appraisal........................................................................           8
  Market Prices and Dividends on NEES Common Shares........................................................           8
  Recent Events............................................................................................           8
  Selected Consolidated Financial Data.....................................................................          10
 
THE ANNUAL MEETING.........................................................................................          11
  Introduction.............................................................................................          11
  Matters to be Considered.................................................................................          11
  Date, Time and Place.....................................................................................          11
  Record Date, Voting Rights and Vote Required.............................................................          11
  Proxies, Revocability of Proxies.........................................................................          12
  Shareholders' Rights of Appraisal........................................................................          12
  Expenses of Solicitation.................................................................................          13
  Exchange of Certificates after Completion of the Merger..................................................          13
 
PROPOSAL 1--AMENDMENT TO THE NEES AGREEMENT AND DECLARATION OF TRUST TO FACILITATE THE MERGER..............          14
 
PROPOSAL 2--THE MERGER.....................................................................................          15
  Background of the Merger.................................................................................          15
  Reasons for the Merger and the Recommendation of the Board...............................................          17
  Opinion of the Financial Advisor.........................................................................          19
  Accounting Treatment of the Merger.......................................................................          24
  Certain Federal Income Tax Consequences to Shareholders..................................................          25
 
REGULATORY MATTERS.........................................................................................          25
  HSR Act..................................................................................................          26
  Federal Power Act........................................................................................          26
  Nuclear Regulatory Commission............................................................................          26
  State Regulatory Approvals...............................................................................          27
  Securities and Exchange Commission Approval Pursuant to 1935 Act.........................................          27
  Exon-Florio..............................................................................................          28
  General..................................................................................................          28
</TABLE>
 
                                       i
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
CERTAIN EFFECTS OF THE MERGER..............................................................................          28
 
CONFLICTS OF INTEREST......................................................................................          29
  General..................................................................................................          29
  Indemnification, Directors and Officers Insurance........................................................          29
  Severance Agreements.....................................................................................          29
  New Employment Agreements................................................................................          30
  Long-Term Performance Share Award Plan...................................................................          32
  Deferred Compensation Plan...............................................................................          32
  Senior Incentive Compensation Plan; Incentive Compensation Plan I; Incentive Compensation Plan II;
    Incentive Compensation Plan III; Incentive Share Plan..................................................          32
  NEES Goals Plan..........................................................................................          33
  Executive Supplemental Retirement Plan; Retirement Supplemental Plan.....................................          33
  Directors Retirement Plan................................................................................          34
  Directors Deferred Compensation Plan.....................................................................          34
  Aggregate Benefits Payable to Officers and Directors.....................................................          34
 
THE MERGER AGREEMENT.......................................................................................          35
  General..................................................................................................          35
  Merger Consideration.....................................................................................          35
  Effective Time...........................................................................................          35
  Conversion of Shares.....................................................................................          35
  Procedure for Payment....................................................................................          36
  Representations and Warranties...........................................................................          36
  Conduct of Business Pending the Merger...................................................................          37
  Directors' and Officers' Insurance and Indemnification...................................................          39
  Employee Matters.........................................................................................          39
  No Solicitation of Proposals.............................................................................          40
  Conditions to Consummation of the Merger.................................................................          40
  Termination..............................................................................................          41
  Termination Fees.........................................................................................          42
  Miscellaneous............................................................................................          43
 
THE COMPANIES..............................................................................................          43
  New England Electric System..............................................................................          43
  National Grid Group and NGG Holdings.....................................................................          44
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF NEES.....................................          44
 
MARKET PRICES OF AND DIVIDENDS ON NEES COMMON SHARES.......................................................          44
 
SELECTED FINANCIAL DATA....................................................................................          46
  Selected Consolidated Financial Data.....................................................................          46
 
PROPOSAL 3--ELECTION OF DIRECTORS..........................................................................          47
 
BOARD STRUCTURE AND COMPENSATION...........................................................................          49
  Executive Committee......................................................................................          49
  Audit Committee..........................................................................................          49
  Compensation Committee...................................................................................          49
  Corporate Governance Committee...........................................................................          50
  Corporate Responsibility Committee.......................................................................          50
  Director Compensation....................................................................................          50
  Attendance...............................................................................................          51
</TABLE>
 
                                       ii
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
  Relationships between Directors and NEES or its Subsidiaries.............................................          51
 
COMPLIANCE WITH SECTION 16(A)REPORTING.....................................................................          51
 
SHARE OWNERSHIP............................................................................................          52
 
SHARE OWNERSHIP GUIDELINES.................................................................................          53
 
REPORT OF THE COMPENSATION COMMITTEE ON EXECUTIVE COMPENSATION.............................................          54
 
SUPPLEMENTAL REPORT OF THE BOARD OF DIRECTORS ON EXECUTIVE COMPENSATION....................................          57
 
CORPORATE PERFORMANCE......................................................................................          58
  Total Return.............................................................................................          58
  Return on Equity.........................................................................................          59
 
EXECUTIVE COMPENSATION.....................................................................................          60
 
PAYMENTS UPON A CHANGE OF CONTROL OR TERMINATION OF EMPLOYMENT.............................................          61
 
PLAN SUMMARIES.............................................................................................          61
  Goals Program............................................................................................          61
  Incentive Thrift Plan....................................................................................          62
  Deferred Compensation Plan...............................................................................          62
  Life Insurance...........................................................................................          62
  Financial Counseling.....................................................................................          62
  Other....................................................................................................          62
 
LONG TERM INCENTIVE PLAN--AWARDS IN LAST FISCAL YEAR.......................................................          62
 
RETIREMENT PLANS...........................................................................................          63
 
PENSION PLAN TABLE.........................................................................................          63
 
PROPOSAL 4--SHAREHOLDER PROPOSAL...........................................................................          64
 
RECENT EVENTS..............................................................................................          65
 
INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS...................................................................          67
 
OTHER MATTERS..............................................................................................          67
 
DEADLINE FOR SHAREHOLDER PROPOSALS FOR 2000 ANNUAL MEETING.................................................          67
 
AVAILABLE INFORMATION......................................................................................          68
 
DOCUMENTS INCORPORATED BY REFERENCE........................................................................          68
</TABLE>
 
Appendix A-- Agreement and Plan of Merger, dated as of December 11, 1998, by and
            among The National Grid Group plc, Iosta LLC and New England
            Electric System
 
Appendix B-- Opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated
 
Appendix C-- Text Showing Changes Proposed to the Agreement and Declaration of
            Trust
 
Appendix D-- Sections 88 to 98 of Chapter 156B of the General Laws of
            Massachusetts
 
Appendix E-- Form of Employment Agreement by and among Richard P. Sergel, New
            England Electric System and The National Grid Group plc, to be
            entered into on the effective date of the merger
 
Appendix F-- Form of Consulting Agreement by and among Alfred D. Houston, New
            England Electric System and The National Grid Group plc, to be
            entered into on the effective date of the merger
 
                                      iii
<PAGE>
                              DEFINED TERMS INDEX
 
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- --------------------------------------------------------------------------------------------------------  -----------
<S>                                                                                                       <C>
1935 Act................................................................................................          27
1999 Growth Rate Multiple...............................................................................          21
1999E Investment Method.................................................................................          21
20-Day Average Price....................................................................................          20
Adjusted Offer Value....................................................................................          23
Annual Base Salary......................................................................................          31
Antitrust Division......................................................................................          26
Assumed Offer Price.....................................................................................          23
Cash Bonus..............................................................................................          31
CFIUS...................................................................................................          28
Code....................................................................................................          25
Company A...............................................................................................          16
Comparable Transactions.................................................................................          22
CDPUC...................................................................................................          27
CTCs....................................................................................................          21
DCF.....................................................................................................          21
Directors Deferral Plan.................................................................................          34
Employment Period.......................................................................................          30
EPS.....................................................................................................          21
EUA.....................................................................................................           8
EUA Expected Synergies..................................................................................          19
EUA Extended Termination Date...........................................................................          66
EUA Initial Termination Date............................................................................          66
EUA Merger..............................................................................................          19
EUA Merger Agreement....................................................................................          18
EUA Merger Consideration................................................................................          65
Exchange Act............................................................................................          29
Excise Tax..............................................................................................          30
Executive...............................................................................................          29
Exon-Florio.............................................................................................           8
Extended Termination Date...............................................................................          41
FERC....................................................................................................           8
Final Orders............................................................................................          40
Financial Disruption....................................................................................          41
Forward EPS.............................................................................................          22
FPA.....................................................................................................          26
FTC.....................................................................................................          26
Goals Plan..............................................................................................          33
Houston Agreement.......................................................................................          31
HSR Act.................................................................................................           8
Incentive Compensation Plans............................................................................          32
Incentive Plans.........................................................................................          30
Initial Termination Date................................................................................          41
LeBoeuf Lamb............................................................................................          16
Massachusetts Secretary.................................................................................          35
MDTE....................................................................................................          27
Merger Consideration....................................................................................       Notice
Merger Fee..............................................................................................          24
Merrill Lynch...........................................................................................           8
Merrill Lynch Opinion...................................................................................          19
MPUC....................................................................................................          66
</TABLE>
 
                                       iv
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- --------------------------------------------------------------------------------------------------------  -----------
<S>                                                                                                       <C>
National Grid Group.....................................................................................           5
National Grid Option....................................................................................          31
NEES....................................................................................................           5
NEES Comparables........................................................................................          21
NGG Holdings............................................................................................           5
NHPUC...................................................................................................          27
NRC.....................................................................................................           8
NYSE....................................................................................................           8
Other Businesses........................................................................................          21
Percentage..............................................................................................          32
Phantom Shares..........................................................................................          31
PSA Plan................................................................................................          32
PUHCA...................................................................................................           8
Rabbi Trust.............................................................................................          11
Rabbi Trust Shares......................................................................................          11
Regulated Operations....................................................................................          21
Retirement Benefit......................................................................................          33
RIPUC...................................................................................................          27
RSP.....................................................................................................          33
SEC.....................................................................................................           8
Sergel Agreement........................................................................................          30
SERP....................................................................................................          33
Severance Agreement.....................................................................................          29
Severance Period........................................................................................          31
Skadden Arps............................................................................................          15
Superior Proposal.......................................................................................          40
Surviving Entity........................................................................................          28
TIN.....................................................................................................          25
VPSB....................................................................................................          27
</TABLE>
 
                                       v
<PAGE>
                        CAUTIONARY STATEMENT CONCERNING
                           FORWARD-LOOKING STATEMENTS
 
    Certain matters discussed in this proxy statement constitute forward-looking
statements within the meaning of the Private Securities Litigation Reform Act of
1995. The forward-looking statements relate to anticipated financial
performance, management's plans and objectives for future operations, business
prospects, outcome of regulatory proceedings, market conditions and other
matters. The Private Securities Litigation Reform Act of 1995 provides a safe
harbor for forward-looking statements in certain circumstances. The following
discussion is intended to identify statements and certain factors that could
cause future outcomes to differ materially from those set forth in the
forward-looking statements.
 
    Forward-looking statements include the information concerning possible or
assumed future results of operations of NEES set forth under "Summary--The
Merger," "The Merger," "Opinion of the Financial Advisor" and "The
Merger--Reasons for the Merger and the Recommendation of the Board" and other
statements in this proxy statement identified by words such as "will likely
result," "anticipate," "estimate," "expect," "intend," "project," "believe," and
"objective," and include, in particular, the statements as to (1) the business,
financial condition, earnings and prospects of NEES and National Grid Group
expected in the future, (2) the beliefs and the basis for those beliefs set
forth under "The Merger--Reasons for the Merger and the Recommendation of the
Board" and (3) the estimates, projections and forecasts analyzed by NEES's
financial advisor in connection with its opinion as set forth under "The
Merger--Opinion of the Financial Advisor." Readers are cautioned not to place
undue reliance on such forward-looking statements, which involve known and
unknown risks, uncertainties and other factors that may cause the actual
results, performance or achievements of NEES to be materially different from any
future results, performance or achievements expressed or implied by such
forward-looking statements. Such factors may affect NEES's operations, markets,
products, services and prices. In addition to any assumptions and other factors
referred to specifically in connection with such forward-looking statements,
factors that could cause NEES's actual results to differ materially from those
contemplated in any forward-looking statement include, among others, the
following: regulatory matters; regulatory delays or conditions imposed by
regulatory bodies in approving the merger; adverse regulatory treatment; the
loss of any significant customers; changes in business strategy or development
plans; the speed and degree to which competition enters the electric utility
industry; state and federal legislative and regulatory initiatives that increase
competition, affect cost or investment recovery or have an impact on rate
structures; industrial, commercial and residential growth in the service
territory of NEES; the impact of general economic changes in New England;
changing fuel prices; distribution facility performance and possible power
shortages; changes in accounting rules and interpretations which may have an
adverse impact on the NEES companies' statements of financial position and
reported earnings; adverse changes in electric load and customer growth; the
weather and other natural phenomena; the timing and extent of changes in
interest rates; and the development of opportunities for growth by the NEES
companies. NEES does not assume any obligation to update such forward-looking
statements to reflect actual results, changes in assumptions or changes in other
factors affecting such forward-looking statements.
 
                                       1
<PAGE>
                          QUESTIONS AND ANSWERS ABOUT
                      THE NEES/NATIONAL GRID GROUP MERGER
 
Q: WHY HAS NEES DECIDED TO MERGE WITH NATIONAL GRID GROUP?
 
    A: As a result of restructuring of the electric utility industry, which was
designed to encourage increased efficiency and competition, NEES has sought ways
to increase the scale of its transmission and distribution business. The Board
of Directors of NEES reviewed strategic options available to NEES, including
remaining an independent transmission and distribution company. The Board
determined that the merger is in the best interest of NEES and its shareholders.
 
Q: HOW WILL I BENEFIT?
 
    A: You will receive a minimum of $53.75 in cash per share. This cash payment
will be subject to an increase if the completion of the merger does not take
place within six months after approval of the merger by NEES shareholders. The
amount of any increase will be determined using a daily accrual rate of
$0.003288 per share until closing, up to a maximum price of $54.35 per share.
The minimum per share price of $53.75 represents a premium of 25%, and the
maximum per share price of $54.35 represents a premium of 26.4%, over the
closing price of $43.00 per common share on December 11, 1998, the last trading
day prior to the public announcement of the merger.
 
Q: DOES THE MERGER WITH NATIONAL GRID GROUP HAVE TO BE APPROVED BY THE
  SHAREHOLDERS OF NEES?
 
    A: Yes, the merger with National Grid Group must be approved by the
affirmative vote of a majority of the total outstanding shares of NEES. Prior to
such vote, the amendment to the NEES Agreement and Declaration of Trust also
must be approved by the affirmative vote of a majority of the total outstanding
shares of NEES.
 
Q: WHY IS IT NECESSARY TO AMEND THE NEES AGREEMENT AND DECLARATION OF TRUST
  PRIOR TO CONSUMMATION OF THE MERGER?
 
    A: The NEES Agreement and Declaration of Trust predates certain amendments
to the Massachusetts statute governing business trusts like NEES which
authorizes business trusts to merge in the manner contemplated by the merger.
The proposed amendment to the NEES Agreement and Declaration of Trust is
designed in part to update the NEES Agreement and Declaration of Trust and to
make it conform to the Massachusetts statute which authorizes NEES to merge in
the manner contemplated by the merger.
 
Q: WILL I STILL BE A SHAREHOLDER OF NEES FOLLOWING THE CONSUMMATION OF THE
  MERGER?
 
    A: No, you will not. Following the consummation of the merger, you will
receive cash in exchange for your shares. NEES shares will be delisted from the
NYSE.
 
Q: WHEN AND WHERE IS THE SHAREHOLDER MEETING?
 
    A: The Annual Meeting of NEES common shareholders will be held on May 3,
1999, at 10:30 a.m., local time, at Mechanics Hall, 321 Main Street, Worcester,
Massachusetts.
 
Q: WHAT DO I NEED TO DO NOW?
 
    A: Just mark, sign and date your proxy card and mail it to New England
Electric System c/o The Bank of New York, P.O. Box 11007, New York, New York
10203-0007 in the enclosed return envelope as soon as possible, so that your
shares may be represented at the Annual Meeting.
 
    If you will be voting against the merger and want to reserve your right to
demand payment for your shares at the appraisal value instead of the amount
payable in the merger if the merger is completed, you must (1) file with NEES,
before the taking of the vote on the approval of the merger, your written
objection to the merger stating that if the merger is consummated, you intend to
demand payment for your shares at the
 
                                       2
<PAGE>
appraisal value thereof and (2) follow the procedure set forth in sections 88 to
98, inclusive, of Chapter 156B of the General Laws of Massachusetts, which is
attached to this document as Appendix D.
 
Q: WILL MY BROKER VOTE MY SHARES FOR ME IF MY SHARES ARE HELD IN "STREET NAME"
  BY MY BROKER?
 
    A: Your broker will vote your shares with respect to the amendment to the
NEES Agreement and Declaration of Trust and the merger only if you tell your
broker to either vote "for," "against" or "abstain". You should instruct your
broker to vote your shares and follow any instructions provided by your broker.
 
Q: WHAT DO I DO IF I WANT TO CHANGE MY VOTE?
 
    A: Just send in a new signed proxy card which is dated later than the proxy
card you last sent, notify NEES in writing that you are changing your vote or
attend the Annual Meeting in person and vote. In order to ensure that your vote
is received in time to be counted, a new signed proxy card or written
notification must be sent to The Bank of New York and should be received by the
close of business on April 30, 1999.
 
Q: WHAT HAPPENS IF I DO NOT VOTE ON THE AMENDMENT TO THE NEES AGREEMENT AND
  DECLARATION OF TRUST IN PROPOSAL 1 OR THE MERGER?
 
    A: If you do not vote for one or both proposals, it will have the same
effect as a vote against the proposal or proposals on which you do not vote.
 
Q: SHOULD I SEND IN MY SHARE CERTIFICATES NOW?
 
    A: No. Promptly after the merger is completed, we will send NEES
shareholders written instructions for exchanging their share certificates for
the amount per share to be received in cash.
 
Q: WHAT HAPPENS TO MY FUTURE DIVIDENDS IF THE MERGER IS APPROVED?
 
    A: NEES intends to continue to pay dividends consistent with past practice
until the merger is completed. NEES also may pay a prorated dividend if the
merger is completed after the record date in a quarter.
 
Q: WHEN DO YOU EXPECT THE MERGER TO BE COMPLETED?
 
    A: The merger will not be completed for some time after it is approved by
NEES shareholders. We are working to complete the merger by early 2000. However,
delays in obtaining regulatory approvals could delay completion of the merger.
As described in the answer to "How will I benefit?" earlier in this "Questions
and Answers. . ." section, shareholders may receive up to $0.60 of additional
cash for their shares if delays extend the completion of the merger beyond six
months from the date of NEES shareholder approval.
 
Q: WHAT ARE THE TAX CONSEQUENCES OF THE MERGER TO ME AS A NEES SHAREHOLDER?
 
    A: The receipt of cash for your shares will be a taxable event for federal
income tax purposes, and may also be taxable under applicable foreign, state,
local or other tax laws. For federal income tax purposes, you generally will
recognize capital gain or loss equal to the difference between the amount of
cash received and your adjusted tax basis for the NEES common shares
surrendered.
 
Q: DO I HAVE APPRAISAL RIGHTS FOR MY NEES COMMON SHARES IF THE MERGER IS
  COMPLETED?
 
    A: If the merger is completed and if you vote against the merger and follow
certain procedures described in this proxy statement, you will have the right to
have an independent valuation made of your shares and receive the amount of the
valuation in exchange for your shares instead of the $53.75 (plus up to $.60 per
share if completion of the merger is delayed) as provided in the merger. The
amount you will receive if you exercise your appraisal rights may be equal to,
more than or less than the amount you would receive as consideration in the
merger.
 
                                       3
<PAGE>
                       WHO CAN HELP ANSWER YOUR QUESTIONS
 
        If you have more questions about the merger you should contact:
 
                           Innisfree M&A Incorporated
                               501 Madison Avenue
                            New York, New York 10022
 
                          Telephone: 1 (888) 750-5835
                              www.innisfreema.com
 
                                       4
<PAGE>
                                    SUMMARY
 
    THIS SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS DOCUMENT AND MAY NOT
CONTAIN ALL OF THE INFORMATION THAT IS IMPORTANT TO YOU. TO UNDERSTAND THE
MERGER FULLY, YOU SHOULD READ CAREFULLY THIS ENTIRE DOCUMENT AND THE DOCUMENTS
TO WHICH WE HAVE REFERRED YOU. SEE "WHO CAN HELP ANSWER YOUR QUESTIONS" (PAGE
4). THE MERGER AGREEMENT IS ATTACHED AS APPENDIX A TO THIS DOCUMENT. WE
ENCOURAGE YOU TO READ THE MERGER AGREEMENT. IT IS THE LEGAL DOCUMENT THAT
GOVERNS THE MERGER.
 
THE COMPANIES (PAGE 43)
 
NEW ENGLAND ELECTRIC SYSTEM
25 Research Drive
Westborough, MA 01582
Tel: (508) 389-2000
 
    New England Electric System ("NEES") is a Massachusetts business trust and a
public utility holding company located in Westborough, Massachusetts. The
principal subsidiaries of NEES include New England Power Company, which is
engaged in the transmission of electricity, and four electricity delivery
companies:
 
    - Massachusetts Electric Company
 
    - The Narragansett Electric Company
 
    - Granite State Electric Company
 
    - Nantucket Electric Company.
 
NEES also controls a number of subsidiaries engaged in various energy-related
businesses. The states in which NEES's subsidiaries serve retail customers are:
Massachusetts, Rhode Island and New Hampshire. NEES's electric utility
subsidiaries also own assets in Connecticut, Maine and Vermont. The principal
executive offices of NEES are located in Westborough, Massachusetts at the
address listed above.
 
THE NATIONAL GRID GROUP PLC
National Grid House
Kirby Corner Road
Coventry CV4 8JY
United Kingdom
Tel: (011-44 1203) 537-777
 
    The National Grid Group plc ("National Grid Group") is a holding company
based in the United Kingdom. National Grid Group through its principal
subsidiary, The National Grid Company plc, owns, operates and maintains the high
voltage electricity transmission system in England and Wales. The principal
executive offices of National Grid Group are located in Coventry, United
Kingdom, at the address listed above.
 
NGG HOLDINGS LLC
260 Franklin Street
Boston, MA 02110
Tel: (617) 439-9500
 
    NGG Holdings LLC, formerly Iosta LLC ("NGG Holdings"), is a subsidiary of
National Grid Group. NGG Holdings was formed recently solely for purposes of the
merger. NGG Holdings has not conducted any business except in connection with
the merger. The principal executive offices of NGG Holdings are located at the
address listed above.
 
THE ANNUAL MEETING (PAGE 11)
 
    DATE, TIME AND PLACE  The Annual Meeting of the common shareholders of NEES
will be held:
 
    - ON MONDAY, MAY 3, 1999
 
    - AT 10:30 A.M., LOCAL TIME
 
    - AT MECHANICS HALL, 321 MAIN STREET, WORCESTER, MASSACHUSETTS.
 
    PURPOSE  Shareholders will be asked to:
 
    - amend the NEES Agreement and Declaration of Trust to authorize certain
      mergers and give shareholders related appraisal rights,
 
    - approve the merger,
 
    - elect directors,
 
    - consider and vote upon a shareholder proposal if properly presented to the
      meeting and
 
    - act on any other business that may properly come before the Annual
      Meeting.
 
If the amendment to the NEES Agreement and Declaration of Trust and the merger
both are approved, and all other conditions to the merger
 
                                       5
<PAGE>
are met, NGG Holdings will merge with and into NEES, and NEES will be the
surviving entity in the merger. As a result of the merger, NGG Holdings will
cease to exist.
 
RECORD DATE FOR VOTING (PAGE 11)
 
    The close of business on March 5, 1999 was the record date for determining
if you are entitled to vote at the Annual Meeting. At the record date, there
were 59,142,452 NEES shares entitled to vote at the Annual Meeting.
 
VOTING (PAGE 11)
 
    A majority of outstanding NEES shares must be present at the Annual Meeting,
either in person or by proxy, in order for a valid vote to take place. You will
have one vote at the Annual Meeting for each NEES share you held of record on
March 5, 1999 to:
 
    - amend the NEES Agreement and Declaration of Trust
 
    - approve the merger
 
    - elect directors
 
    - consider and vote upon a shareholder proposal if properly presented to the
      meeting
 
    - act on any other business that may properly come before the Annual Meeting
 
    The amendment to the NEES Agreement and Declaration of Trust and the merger
will be approved if holders of a majority of outstanding NEES shares vote "FOR"
each of Proposal 1 and Proposal 2. The election of directors and the shareholder
proposal will be approved if holders of a majority of the shares entitled to
vote and present in person or by proxy at the meeting vote "FOR" approval.
 
    Your vote is important. An abstention or failure to vote will have the same
effect as (1) a vote "AGAINST" the amendment to the NEES Agreement and
Declaration of Trust, and (2) a vote "AGAINST" the merger. An abstention will
have the same effect as a vote "WITHHOLD AUTHORITY" on the election of directors
and a vote "AGAINST" the shareholder proposal.
 
    A shareholder may change his/her vote by:
    - submitting a duly executed proxy bearing a later date or time than the
      previous proxy being revoked, or
 
    - revoking the proxy in writing and sending the revocation to The Bank of
      New York before the Annual Meeting, or
 
    - voting in person at the Annual Meeting.
 
    By completing the enclosed proxy you are voting the shares of NEES held in
your name and any shares held by you under the dividend reinvestment and common
share purchase plan and restricted shares under the Incentive Share Plan. In the
event common shares are held in trust for you as a participant in one or more
thrift plans, you will receive a separate form for instructing the trustee how
to vote those shares.
 
THE MERGER (PAGE 15)
 
    If the amendment to the NEES Agreement and Declaration of Trust and the
merger are each approved by the shareholders of NEES and the other conditions to
the merger are satisfied or where permitted, waived NGG Holdings will merge with
and into NEES, and as a result, NGG Holdings will cease to exist.
 
    National Grid Group has informed NEES that as soon as possible following the
merger closing, National Grid Group intends to amend the NEES Agreement and
Declaration of Trust to permit a merger of NEES into a Massachusetts business
corporation. As soon as possible following such amendment, National Grid Group
intends to merge NEES with and into a newly-formed, wholly-owned subsidiary of
National Grid Group, which will be a Massachusetts business corporation. At that
time, the separate existence of NEES will cease.
 
WHAT YOU WILL RECEIVE IN THE MERGER (PAGE 35)
 
    Each NEES common share, other than:
 
    - shares held by NEES, as treasury stock, or held by any of NEES's
      subsidiaries, and
 
    - shares owned by National Grid Group or any of its subsidiaries
 
                                       6
<PAGE>
and each common share held as treasury shares under a rabbi trust maintained by
NEES to satisfy certain benefits obligations will receive $53.75 in cash per
share. This cash payment will increase by $0.003288 per share, up to a maximum
price of $54.35 per share, for each day completion of the merger is delayed
longer than six months after approval of the merger by NEES shareholders.
 
PAYMENT FOR SHARES (PAGE 13)
 
    Upon consummation of the merger, National Grid Group or NGG Holdings
promptly will make available to a paying agent cash to be paid to NEES
shareholders. The paying agent will mail a letter of transmittal and
instructions for use in surrendering NEES shares in exchange for cash to each
holder of record of NEES common shares.
 
TIMING FOR COMPLETION OF THE MERGER (PAGE 25, 35, 41)
 
    The merger will become effective at the time when all conditions to the
merger have been satisfied. It is currently anticipated that the merger will be
completed within nine months following NEES's shareholder approval, but
completion could be delayed (1) to obtain regulatory approvals and/or (2) if
National Grid Group's ability to finance the transaction is disrupted by severe
problems in the world's capital markets. While there can be no assurance that
the required regulatory approvals will be obtained, NEES and National Grid Group
believe that the necessary approvals can be obtained and the merger completed by
early 2000.
 
CONDITIONS TO THE MERGER (PAGE 40)
 
    The obligations of the parties to complete the merger are subject to, among
other requirements:
 
    - obtaining the approval of a majority of NEES outstanding shares for both
      the amendment to the NEES Agreement and Declaration of Trust and the
      merger; and
 
    - obtaining the approval of a majority of National Grid Group's shareholders
      voting at an extraordinary general meeting; and
 
    - complying with the regulatory requirements set forth under "Regulatory
      Matters" on page 25.
 
BACKGROUND OF THE MERGER (PAGE 15)
 
    For a description of the events leading to the approval of the merger
agreement by the NEES Board, see "THE MERGER--Background of the Merger."
 
RECOMMENDATION OF THE NEES BOARD (PAGE 15, 17, 47, 64)
 
    THE NEES BOARD, AFTER CONSIDERING THE TERMS OF THE PROPOSED MERGER
AGREEMENT, UNANIMOUSLY:
 
    - DETERMINED THAT THE MERGER IS FAIR TO, AND IN THE BEST INTEREST OF, NEES
      AND ITS SHAREHOLDERS;
 
    - APPROVED THE MERGER; AND
 
    - DETERMINED TO RECOMMEND TO SHAREHOLDERS THAT THEY VOTE "FOR" APPROVAL OF
      THE MERGER.
 
    For a discussion of the factors the Board considered, see (page 17) "Reasons
for the Merger and the Recommendation of the Board."
 
    THE BOARD UNANIMOUSLY RECOMMENDS THAT NEES SHAREHOLDERS VOTE "FOR" THE
AMENDMENT TO THE NEES AGREEMENT AND DECLARATION OF TRUST.
 
    THE BOARD UNANIMOUSLY RECOMMENDS THAT NEES SHAREHOLDERS VOTE "FOR" APPROVAL
OF THE MERGER.
 
    THE BOARD ALSO UNANIMOUSLY RECOMMENDS THAT NEES SHAREHOLDERS VOTE "FOR" THE
ELECTION OF THE INDIVIDUALS NOMINATED AS DIRECTORS.
 
    THE BOARD UNANIMOUSLY RECOMMENDS THAT NEES SHAREHOLDERS VOTE "AGAINST" THE
SHAREHOLDER PROPOSAL.
 
                                       7
<PAGE>
OPINION OF FINANCIAL ADVISOR (PAGE 19)
 
    Merrill Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch")
delivered an opinion to the NEES Board of Directors at a meeting held on
December 11, 1998, to the effect that the Merger Consideration was fair from a
financial point of view to the holders of NEES common shares. The full text of
the opinion of Merrill Lynch dated as of the date of this proxy statement sets
forth the assumptions made, matters considered and limits of the review
undertaken by Merrill Lynch and is attached to this document as Appendix B. YOU
SHOULD CAREFULLY READ THE OPINION OF MERRILL LYNCH IN ITS ENTIRETY. MERRILL
LYNCH'S OPINION IS DIRECTED TO THE BOARD, RELATES ONLY TO THE FAIRNESS OF THE
MERGER CONSIDERATION FROM A FINANCIAL POINT OF VIEW TO THE HOLDERS OF NEES
COMMON SHARES AND DOES NOT CONSTITUTE A RECOMMENDATION AS TO HOW YOU SHOULD VOTE
ON THE MERGER.
 
FEDERAL INCOME TAX CONSEQUENCES (PAGE 25)
 
    The receipt of cash by a shareholder as a result of the merger will be a
taxable transaction for federal income tax purposes and may also be a taxable
transaction under applicable local, state, foreign and other tax laws.
 
REGULATORY MATTERS (PAGE 25)
 
    Certain federal and state regulatory requirements must be complied with
before the merger can be completed, including:
 
    - the approval of the Federal Energy Regulatory Commission ("FERC");
 
    - the approval of the Securities and Exchange Commission ("SEC") pursuant to
      the Public Utility Holding Company Act of 1935 ("PUHCA");
 
    - approval of the Nuclear Regulatory Commission ("NRC"); and
 
    - the support or approval of the regulatory agencies in the states in which
      NEES companies operate.
 
    In addition, prior to completing the merger, the applicable waiting period
under a federal antitrust law, the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended (the "HSR Act"), must expire or terminate, and the merger
must survive any challenge by the federal government on the basis of national
security concerns under the Exon-Florio Provisions of the Omnibus Trade and
Competitiveness Act of 1988 ("Exon-Florio").
 
SHAREHOLDERS' RIGHTS OF APPRAISAL (PAGE 12)
 
    If the merger is completed, any NEES shareholder who (1) files a written
objection to the merger with NEES before the taking of the vote on the approval
of the merger, (2) votes against the merger and (3) follows certain procedures
described in this proxy statement, will have the right to have an independent
valuation made of his or her shares and receive the amount of the valuation in
exchange for his or her shares instead of the $53.75 (plus up to $.60 per share
if completion of the merger is delayed) as provided in the merger. The amount
you will receive if you exercise your appraisal rights may be equal to, more
than or less than the amount you would receive as consideration in the merger.
 
MARKET PRICES AND DIVIDENDS ON NEES COMMON SHARES (PAGE 44)
 
    On December 11, 1998, the last day of trading prior to the announcement of
the merger, the high, low and closing sales prices of the common shares as
quoted on the New York Stock Exchange ("NYSE") were $43.00, $42.00 and $43.00,
respectively.
 
    On March 18, 1999, the most recent practicable date prior to the printing of
this proxy statement, the high, low and closing prices of the common shares as
quoted on the NYSE were $49 1/8, $48 13/16, and $49 1/8, respectively.
 
RECENT EVENTS (PAGE 65)
 
    In keeping with NEES's announced goal of expanding its electricity delivery
business, on February 1, 1999, NEES announced that it had entered into an
agreement to merge with Eastern Utilities Associates ("EUA"), under which NEES
will acquire all outstanding shares of EUA for $31 per share subject to an
upward adjustment. NEES and EUA consistently have
 
                                       8
<PAGE>
been the two lowest-cost, major electric companies in the New England region. It
is expected that the geographical fit of the two companies will result in even
greater efficiencies. The merger between NEES and EUA is expected to be
completed by early 2000. The merger between NEES and EUA is not conditioned on
the closing of the merger between NEES and National Grid. National Grid has
consented to the EUA merger. NEES shareholders are not being asked to vote on
the NEES/EUA merger because no NEES shares are being offered in connection with
that merger, and because the NEES Agreement and Declaration of Trust does not
require that NEES shareholders approve such a merger.
 
                                       9
<PAGE>
SELECTED CONSOLIDATED FINANCIAL DATA
 
    The following table sets forth selected consolidated financial data of NEES
and its subsidiaries for each of its five fiscal years ended December 31, 1994
through December 31, 1998. NEES's financial statements for the years ended
December 31, 1994 through December 31, 1997 were audited by Coopers & Lybrand
L.L.P. (now known as PriceWaterhouseCoopers LLP following a merger with Price
Waterhouse LLP), independent public accountants. NEES's financial statements for
the year ended December 31, 1998 were audited by PriceWaterhouseCoopers LLP,
independent public accountants.
 
    The selected financial data set forth below does not purport to be complete
and should be read in conjunction with, and are qualified in their entirety by,
NEES's annual reports, including the notes thereto, to which the reader should
refer and may obtain from NEES or the SEC.
<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                             --------------------------------------------------------------------
<S>                                          <C>           <C>           <C>           <C>           <C>
                                                 1998          1997          1996          1995          1994
                                             ------------  ------------  ------------  ------------  ------------
 
<CAPTION>
                                                       (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                          <C>           <C>           <C>           <C>           <C>
SELECTED INCOME STATEMENT DATA
Operating Revenue..........................  $  2,420,533  $  2,502,591  $  2,350,698  $  2,271,712  $  2,243,029
Operating Income...........................  $    316,626  $    366,861  $    348,118  $    323,428  $    296,496
Net Income:
  Continuing Operations....................  $    190,042  $    220,038  $    208,936  $    204,757  $    199,426
 
Earnings per Diluted Average Common Share
  Outstanding:
  Continuing Operations....................  $       3.04  $       3.39  $       3.22  $       3.15  $       3.07
 
Cash Dividends Declared Per Common Share...  $       2.36  $       2.36  $       2.36  $      2.345  $      2.285
 
SELECTED BALANCE SHEET DATA
Total Assets...............................  $  5,081,959  $  5,311,647  $  5,223,251  $  5,190,876  $  5,084,841
Total Long-Term Debt.......................  $  1,054,912  $  1,487,481  $  1,614,578  $  1,675,170  $  1,520,488
Common Share Equity........................  $  1,572,131  $  1,744,442  $  1,685,417  $  1,631,779  $  1,580,838
Book Value Per Share.......................  $      26.53  $      27.03  $      25.98  $      25.13  $      24.33
</TABLE>
 
                                       10
<PAGE>
                               THE ANNUAL MEETING
 
INTRODUCTION
 
    The Board of Directors of NEES is soliciting proxies in the accompanying
form. The Board unanimously recommends that the shareholders of NEES vote FOR
the amendment to the NEES Agreement and Declaration of Trust, FOR approval of
the merger with National Grid Group, FOR the election of directors, and AGAINST
the shareholder proposal.
 
MATTERS TO BE CONSIDERED
 
    At the Annual Meeting, holders of NEES common shares will be asked to amend
the NEES Agreement and Declaration of Trust and approve the merger, which is
governed by the merger agreement, dated as of December 11, 1998, by and among
National Grid Group, NGG Holdings and NEES, and the transactions contemplated by
the merger agreement, including the merger of NGG Holdings with and into NEES.
As a result of the merger, each common share (other than (1) shares held by
NEES, as treasury stock, or any of its subsidiaries and (2) shares owned by
National Grid Group or any of its subsidiaries) will be converted into the right
to receive the Merger Consideration upon surrender of the certificate formerly
evidencing such common share. In addition, the common shares held as treasury
shares (the "Rabbi Trust Shares") under the New England Electric System
Companies' Rabbi Trust effective January 1, 1994, amended October 3, 1994 and
amended December 2, 1996 (the "Rabbi Trust"), will be converted into the right
to receive the Merger Consideration.
 
    At the Annual Meeting, NEES shareholders also will be asked to elect
directors and to vote on a shareholder proposal, if properly presented to the
meeting.
 
DATE, TIME AND PLACE
 
    The Annual Meeting will be held on Monday, May 3, 1999 at 10:30 a.m., local
time, at Mechanics Hall, 321 Main Street, Worcester, Massachusetts and at any
adjournment thereof.
 
RECORD DATE, VOTING RIGHTS AND VOTE REQUIRED
 
    The Board of Directors has fixed the close of business on March 5, 1999 as
the record date for the determination of holders of common shares entitled to
notice of, and to vote at, the Annual Meeting and any adjournment thereof.
Accordingly, holders of record of common shares issued and outstanding as of the
close of business on the record date will be entitled to notice of, and to vote
at, the Annual Meeting. On the record date, there were 59,142,452 common shares
issued and outstanding and entitled to vote held by approximately 44,000 holders
of record. Each common share is entitled to one vote on each matter to be acted
upon or which may come before the Annual Meeting.
 
    An affirmative vote of a majority of the shares outstanding and entitled to
vote is required for approval of the amendment to the NEES Agreement and
Declaration of Trust. If the amendment to the NEES Agreement and Declaration of
Trust is approved by NEES shareholders, an affirmative vote of a majority of the
shares outstanding and entitled to vote will be required for approval of the
merger with National Grid Group. Both the proposal to amend the NEES Agreement
and Declaration of Trust and the merger proposal must be approved by the NEES
shareholders for the merger to occur. An affirmative vote of a majority of the
shares present in person or represented by proxy at the meeting and entitled to
vote is required for the election of directors and for the approval of any
shareholder proposal if properly presented to the meeting.
 
    Broker nonvotes on a particular proposal (shares held by brokers or nominees
as to which instructions have not been received from the beneficial owners and
the broker or nominee does not have discretionary voting power on that proposal)
will be counted as present but not voting on such matter.
 
                                       11
<PAGE>
PROXIES, REVOCABILITY OF PROXIES
 
    If a shareholder does not return a properly executed proxy, and does not
vote at the Annual Meeting, his or her shares will not be voted, which will have
the same effect as a vote "Against" the amendment to the NEES Agreement and
Declaration of Trust and a vote "Against" approval of the merger.
 
    The enclosed proxy provides that each shareholder of NEES may specify that
his or her common shares be voted "For", "Against" or "Abstain" from voting with
respect to (1) the amendment to the NEES Agreement and Declaration of Trust, (2)
the approval of the merger, (3) the shareholder proposal and (4) any other
business that may properly come before the Annual Meeting or any adjournments
thereof. Abstentions are counted separately, but have the same effect as
"Against" votes for the matters listed above.
 
    In addition, the enclosed proxy provides that each shareholder of NEES may
specify that his or her common shares be voted "For" or "Withhold Authority" for
the election of directors. Any shareholder executing and returning a proxy has
the right to withhold authority with respect to the election of directors. In
connection with the election of directors, a vote to "Withhold Authority" will
have the same effect as an abstention. If a shareholder does not return a
properly executed proxy, and does not vote at the Annual Meeting, then his or
her shares will not be counted for a quorum at the meeting and will not be voted
with respect to the election of directors.
 
    If a shareholder does not return a properly executed proxy, and does not
vote at the Annual Meeting, then his or her shares will not be counted for a
quorum at the meeting and will not be voted with respect to the shareholder
proposal.
 
    If properly executed and received prior to or at the Annual Meeting, and not
revoked, the enclosed proxy will be voted in accordance with the choice
specified. Where a signed proxy is returned, but no choice is specified, the
common shares will be voted "FOR" approval of the amendment to the NEES
Agreement and Declaration of Trust, "FOR" approval of the merger, "FOR" the
election of directors and "AGAINST" the shareholder proposal. SHAREHOLDERS
SHOULD MARK THE RELEVANT BOX ON THE PROXY TO INDICATE HOW THEIR COMMON SHARES
ARE TO BE VOTED. IN ORDER TO ENSURE THAT VOTES ARE RECEIVED IN TIME TO BE
COUNTED, PROXIES SHOULD BE RECEIVED BY THE CLOSE OF BUSINESS ON APRIL 30, 1999.
 
    Any shareholder who executes and returns a proxy may revoke it at any time
before it is voted at the Annual Meeting. A shareholder may revoke a proxy by
(1) submitting a duly executed proxy bearing a later date or time than the date
or time of the proxy being revoked; (2) revoking the proxy in writing and
delivering the revocation to The Bank of New York before the Annual Meeting; or
(3) voting in person at the Annual Meeting. A shareholder's attendance at the
Annual Meeting will not by itself revoke a proxy given by such shareholder.
 
    By completing the enclosed proxy you are voting the common shares held in
your name and, any shares held by you under the dividend reinvestment and common
share purchase plan and any restricted shares held by you under the Incentive
Share Plan. In the event common shares are held in trust for you as a
participant in one or more thrift plans, you will receive a separate form for
instructing the trustee how to vote those shares.
 
    SHAREHOLDERS SHOULD NOT FORWARD ANY SHARE CERTIFICATES WITH THEIR PROXY
CARDS. A LETTER OF TRANSMITTAL WITH INSTRUCTIONS FOR THE SURRENDER OF SHARE
CERTIFICATES WILL BE MAILED TO SHAREHOLDERS PROMPTLY AFTER THE EFFECTIVE TIME OF
THE MERGER.
 
SHAREHOLDERS' RIGHTS OF APPRAISAL
 
    If the amendment to the NEES Agreement and Declaration of Trust and the
merger both are approved by the shareholders at the meeting and the merger is
completed, any shareholder (1) who
 
                                       12
<PAGE>
files with NEES, before the taking of the vote on the approval of the merger,
written objection to the merger stating that he or she intends to demand payment
for his or her shares at the appraisal value thereof instead of the amount
payable in the merger if the merger is completed and (2) whose shares are not
voted in favor of the merger, will have the right to demand in writing from NEES
within twenty days after the date of mailing to him or her of notice in writing
that the merger has become effective, payment for his or her shares at the
appraisal value thereof instead of the amount payable in the merger. NEES and
such shareholder shall in such cases have the rights and duties and shall follow
the procedure set forth in sections 88 to 98, inclusive, of Chapter 156B of the
General Laws of Massachusetts, which are set forth in Appendix D to this
document.
 
EXPENSES OF SOLICITATION
 
    This solicitation is by the Board of Directors of NEES. The expense of
preparing and mailing this proxy statement and other incidental expenses of
solicitation will be paid by NEES. Arrangements will be made with brokerage
houses and other custodians, nominees, and fiduciaries to send proxies and proxy
material to their principals, and NEES will reimburse them for the expense of
doing so. Officers and regular employees of a subsidiary of NEES may solicit
proxies through the use of the mails or telephone, facsimile, or electronic
mail. Innisfree M&A Incorporated has been retained to assist NEES in the
solicitation of proxies, primarily from brokers, banks, and other nominees, at
an estimated initial cost of $25,000 plus reimbursement of reasonable
out-of-pocket expenses.
 
EXCHANGE OF CERTIFICATES AFTER COMPLETION OF THE MERGER
 
    Prior to the effective time of the merger, National Grid Group or NGG
Holdings will designate a bank or trust company to act as paying agent to effect
the payment of the Merger Consideration. National Grid Group or NGG Holdings
will make available to the paying agent available funds in amounts and at the
times necessary for the payment of the Merger Consideration upon surrender of
the shareholder's share certificate. Promptly after the effective time of the
merger, the paying agent will mail to each holder of record of NEES common
shares at the effective time of the merger (1) a letter of transmittal (which
will specify that delivery will be effected, and risk of loss and title to the
share certificate will pass, only upon actual delivery of the share certificate
to the paying agent) and (2) instructions for use in effecting the surrender of
the share certificate in exchange for the Merger Consideration.
 
    Upon surrender of a share certificate to the paying agent for cancellation,
together with a duly executed letter of transmittal and such other documents as
the paying agent may require, the holder of such share certificate will be
entitled to receive the Merger Consideration in exchange for each common share
represented by the certificate so surrendered. In the event of a transfer of
ownership of canceled shares which is not registered in the transfer records of
NEES, the Merger Consideration may be given to a transferee if the certificate
representing such share is presented to the paying agent, accompanied by all
documents required to evidence and effect such transfer and by evidence
satisfactory to the paying agent that any applicable stock transfer taxes have
been paid. Until surrendered, each share will be deemed at any time after the
effective time of the merger to represent only the right to receive the Merger
Consideration upon surrender of such share. No interest will be paid or will
accrue on the Merger Consideration payable to holders of shares.
 
    SHAREHOLDERS SHOULD NOT FORWARD SHARE CERTIFICATES TO THE PAYING AGENT UNTIL
THEY HAVE RECEIVED TRANSMITTAL FORMS. SHAREHOLDERS SHOULD NOT RETURN SHARE
CERTIFICATES WITH THE ENCLOSED PROXY.
 
                                       13
<PAGE>
                PROPOSAL 1--AMENDMENT TO THE NEES AGREEMENT AND
                 DECLARATION OF TRUST TO FACILITATE THE MERGER
                               (A NEES PROPOSAL)
 
    The Board of Directors recommends a vote "FOR" this proposal.
 
    NEES is a Massachusetts business trust and not a corporation. NEES is
governed by an Agreement and Declaration of Trust rather than Articles of
Organization. The proposed amendment would provide that:
 
    - a Massachusetts limited liability company like NGG Holdings LLC could be
      merged into NEES
 
    - shareholders who do not consent to a merger are entitled to appraisal
      rights substantially identical to appraisal rights shareholders of a
      Massachusetts business corporation merging with another Massachusetts
      business corporation have and that the appraisal rights are the only
      remedy non-consenting shareholders have.
 
    The proposed new Article 59B provides that a Massachusetts limited liability
company could merge into NEES in accordance with Chapters 156C and 182 of the
Massachusetts General Laws. A limited liability company is a relatively new kind
of entity that is like a partnership in some respects and like a corporation in
other respects. Under Chapters 156C and 182 of the Massachusetts statutes, which
were enacted in 1995, a Massachusetts limited liability company may merge with a
Massachusetts business trust. The NEES Agreement and Declaration of Trust
predated the Massachusetts statute on limited liability companies, and
accordingly, the NEES Agreement and Declaration of Trust did not give
shareholders the ability to vote to merge with limited liability companies. The
proposed amendment will enable shareholders to vote on such merger. After
adoption of the proposed amendment, such a merger could be effected by vote of a
majority of the shares outstanding and a two-thirds vote of the Board of
Directors. In order to accomplish the merger of NGG Holdings into NEES, this
amendment to the NEES Agreement and Declaration of Trust is necessary.
 
    The proposed new Article 59B also provides that in any merger between NEES
and a Massachusetts limited liability company, shareholders who vote against the
merger, and follow the procedures set forth below, have the same appraisal
rights as stockholders of a Massachusetts business corporation merging with
another Massachusetts business corporation. Massachusetts General Laws, Chapter
156B, Sections 87-98 provide that stockholders of a Massachusetts business
corporation in such a merger, if they give a specified written notice before a
merger vote and also vote against the merger, can go through a procedure to have
an independent valuation made of the shares and receive the amount of the
valuation in exchange for their shares. Such an appraisal procedure is being
offered in the current merger vote being taken. See page 12 for a description of
appraisal rights. This would be the only remedy for any objecting shareholders
should such a merger be consummated. The proposed language changes to Article 58
would conform Article 58 to Article 59B to allow for a certificate to be filed
in the event of a merger pursuant to the new Article 59B.
 
    The text of existing Article 58 and the proposed language changes and the
text of the proposed new Article 59B are in Appendix C. The description of the
proposed amendment given above is qualified in its entirety by reference to
Appendix C.
 
    To become effective, the proposed amendment to the NEES Agreement and
Declaration of Trust must be approved by an affirmative vote of shareholders
holding a majority of the outstanding shares. The Board of Directors must
approve the amendment by a two-thirds vote. The SEC must also grant an order
under the Public Utility Holding Company Act of 1935 authorizing the proposed
amendment. NEES is seeking such authorization.
 
                                       14
<PAGE>
                             PROPOSAL 2--THE MERGER
 
    THE BOARD OF DIRECTORS OF NEES HAS UNANIMOUSLY APPROVED THE MERGER. THE
BOARD UNANIMOUSLY RECOMMENDS THAT NEES SHAREHOLDERS VOTE "FOR" APPROVAL OF THE
MERGER.
 
    THE DISCUSSION IN THIS PROXY STATEMENT OF THE MERGER AND THE DESCRIPTION OF
THE PRINCIPAL TERMS THEREOF ARE SUBJECT TO AND QUALIFIED IN THEIR ENTIRETY BY
REFERENCE TO THE MERGER AGREEMENT, A COPY OF WHICH IS ATTACHED AS APPENDIX A TO
THIS PROXY STATEMENT AND WHICH IS INCORPORATED IN THIS PROXY STATEMENT BY
REFERENCE. SHAREHOLDERS ARE URGED TO READ THE MERGER AGREEMENT IN ITS ENTIRETY.
 
BACKGROUND OF THE MERGER
 
    Historically, electric utilities have provided their customers bundled
electric service, including power supply, transmission and distribution service,
within exclusive franchise service territories. As the result of a number of
trends, including a disparity in electric rates among regions of the country and
new regulations and legislation intended to foster competition, electric
consumers in various states are being allowed to choose their power supplier,
with incumbent utilities being required to deliver that electricity over their
transmission and distribution systems. In the states served by the NEES
companies, as the result of legislation and agreements entered into by the NEES
companies with state regulators, all customers of the NEES companies currently
have the right to choose their power supplier.
 
    To support the development of a competitive market, utilities in some states
(particularly in the Northeast United States) have been strongly encouraged to
separate (1) ownership of generating plants, which are expected to operate in a
competitive market, from (2) ownership of transmission and distribution
facilities which, because of their natural monopoly characteristics, continue to
operate in a regulated environment. In 1996, as part of its settlements with
state regulators and other parties, NEES agreed to divest its generation
business. This agreement to divest enabled NEES to quantify its stranded costs
and secured support from regulators and legislative leaders for the recovery by
NEES of those stranded costs. Divestiture of the generation business also
allowed NEES to concentrate on the electricity delivery business, and avoid the
volatile returns and possible losses from the generation business. In September
1998, NEES completed the divestiture of substantially all of its non-nuclear
generating businesses, becoming principally a transmission and distribution
company.
 
    As a result of these and other developments designed to encourage increased
efficiency and lower electricity prices, NEES has over the past several years
evaluated opportunities to gain efficiencies by expanding the scale of its
business through mergers and acquisitions. Together with its financial advisor,
Merrill Lynch, and its legal counsel, Skadden, Arps, Slate, Meagher & Flom LLP
("Skadden Arps"), management of NEES has reviewed with the Board on numerous
occasions various potential merger and acquisition opportunities. Expansion of
NEES's transmission and distribution business was incorporated as a major
strategic goal in "NEES 2000", NEES's business goals, introduced at the Annual
Shareholder Meeting in April 1997.
 
    At a special meeting of the Board in February 1998, management reviewed with
the Board its outlook for NEES's business given industry restructuring and the
pending divestiture of NEES's generating business. In addition to reviewing
potential acquisition opportunities, management also discussed with the Board
that the sale of NEES or the merger of NEES with another entity could produce
more value for shareholders than an acquisition, because at the time of the
meeting utilities were trading at cyclical highs, and many companies in the
utility industry had a significant amount of cash as a result of recent asset
sales and securitizations, with limited opportunities to redeploy that cash
other than through acquisitions. After discussion, the Board authorized
management and its advisors to continue
 
                                       15
<PAGE>
exploring the acquisition of other transmission and distribution companies but
also authorized the commencement of discussions with entities who would be
interested in considering a merger with or acquisition of NEES.
 
    As a result of the Board's direction, a number of potential strategic
partners were contacted in order to determine the potential interest of those
entities in commencing discussions with NEES. Some of these entities, including
National Grid Group, had previously been approached or had approached NEES
regarding a potential business combination. Those entities which expressed an
interest in commencing discussions were asked to sign confidentiality and
standstill agreements with NEES in order to gain access to proprietary business
information. A confidentiality and standstill agreement was entered into with
The National Grid Company in June 1998.
 
    From February through August 1998, NEES management and advisors to NEES met
with National Grid Group principals and advisors to National Grid Group for the
purpose of sharing business information and investigating a combination of NEES
with National Grid Group. Also during the period February through August 1998,
NEES management and advisors to NEES met with five parties other than National
Grid Group who were preliminarily interested in acquiring or merging with NEES;
the purpose of these meetings also was to share business information and
investigate a combination of NEES with those entities. At five meetings of the
Board during this period, management reviewed with the Board the status of the
various discussions and discussed the benefits to NEES and its shareholders of
continuing as an independent transmission and distribution company, or entering
into a business combination with one or more interested parties. These five
meetings of the Board took place on February 24, April 28, May 26, July 15, and
August 25, 1998.
 
    Beginning in September 1998, NEES began more extensive discussions with
National Grid Group and one other interested party who had signed a
confidentiality and standstill agreement ("Company A"). On September 10, 1998
senior management of NEES (Richard P. Sergel, President and Chief Executive
Officer; Alfred D. Houston, Chairman; Michael E. Jesanis, Senior Vice President
and Chief Financial Officer; Cheryl A. LaFleur, Senior Vice President and
General Counsel; and Lawrence J. Reilly, President of the NEES distribution
companies) and National Grid Group (David Jones, Group Chief Executive; Roger
Urwin, Managing Director, Transmission; Wob Gerretsen, Business Development
Director; Charles Carter, Corporate Finance Manager, and Clare Phelan,
President, National Grid (USA) Inc.) met for the purpose of sharing strategic
visions about their respective businesses and the potential advantages of
combining NEES with National Grid Group.
 
    Also beginning in September 1998, NEES and Company A conducted comprehensive
due diligence of each other's operations to allow Company A the opportunity to
make a proposal for a merger with or acquisition of NEES. Between September 23,
1998 and November 13, 1998, NEES management discussed potential terms for a
merger with management of Company A. There were also several meetings and
telephone conferences between NEES and National Grid Group senior management.
 
    The NEES Board of Directors met on September 22, October 26 (in executive
session), October 27, and November 4, 1998, and the Executive Committee of the
Board of Directors met on October 1, 1998. At these meetings, members of the
Board were apprised of the progress of discussions with National Grid Group and
Company A, as well as the regulatory requirements to close a business
combination with either. The Board directed management to continue discussions
with both National Grid Group and Company A.
 
    On October 19, 1998, a meeting of LeBoeuf, Lamb, Greene & MacRae, L.L.P.
("LeBoeuf Lamb"), counsel to National Grid Group, Skadden Arps and NEES's
internal legal counsel was conducted to discuss the strategy for obtaining
regulatory approvals of a potential combination of the parties.
 
    On November 4, 1998, at a meeting attended by Messrs. Sergel and Jesanis for
NEES and Messrs. Jones and Stephen Box (Finance Director) for National Grid
Group, National Grid Group
 
                                       16
<PAGE>
informed NEES of its desire to make a proposal to acquire NEES and provided an
indication of potential terms of such an acquisition. On November 12, 1998, at a
meeting in London attended by the same four people, NEES informed National Grid
Group that its potential terms were inadequate and that continued discussions
would be useful only if National Grid Group were willing to improve its
potential terms. At this meeting, NEES agreed to provide National Grid Group
with additional financial and other data. As a result, National Grid Group
agreed to continue discussions with NEES and to conduct final due diligence on
NEES's operations while reconsidering its initial proposal. Telephone
conferences among NEES and National Grid senior management occurred on November
16 and 18, 1998.
 
    On November 22, 1998, Company A submitted to NEES a proposal to acquire
NEES, which included an indicative price, subject to the negotiation of a
satisfactory merger agreement. On November 24, 1998, management reviewed Company
A's proposal and management's discussions with National Grid Group with the
Board. Management recommended, and the Board concurred, that NEES proceed to
negotiate a merger agreement with Company A and also continue to negotiate with
National Grid Group.
 
    LeBoeuf Lamb produced a draft merger agreement on December 1, 1998, and
negotiating sessions were conducted by counsel to both parties on December 4, 8,
10, and 11, 1998. Telephone conferences and meetings between NEES and National
Grid Group were held on November 22, 23, and 30 and on December 6 and 7, 1998.
On December 8, 1998, National Grid Group made a proposal, subject to negotiation
of a definitive merger agreement, to acquire NEES for $53.75 per share subject
to upward adjustment of up to $.60 per share for delays in the closing. On
December 9, 1998, Company A advised NEES that it would not offer more than its
previous proposed indicative price which was less than National Grid Group's
proposal to acquire NEES.
 
    On December 9, 1998, the Board met to discuss and consider the proposals
that had been received from National Grid Group and Company A. No other parties
made proposals to acquire or merge with NEES. NEES's internal legal counsel and
Skadden Arps discussed with the Board the legal and regulatory implications of
the proposed transactions. Following its deliberations, the Board determined it
was in the best interests of NEES's shareholders to continue to negotiate a
merger with National Grid Group because the proposal from National Grid Group
was financially superior to the proposal from Company A. Accordingly, the Board
authorized management, together with Merrill Lynch and NEES's legal counsel, to
suspend negotiations with Company A. The Board also authorized continued
negotiations with respect to the proposal submitted by National Grid Group.
 
    On December 10 and 11, 1998, NEES, assisted by Merrill Lynch and Skadden
Arps, completed negotiations with National Grid Group and LeBoeuf Lamb of the
terms of the merger and the merger agreement.
 
    On December 11, 1998, the Board held a special meeting to review the terms
of the transaction that had been negotiated with National Grid Group. After
presentations by Merrill Lynch and Skadden Arps and full discussion and analysis
by the Board, the Board unanimously (1) determined that it was in the best
interests of NEES and its shareholders for NEES to enter into a business
combination with National Grid Group, (2) determined that the terms of the
merger were fair to, and in the best interests of, the shareholders of NEES, and
(3) authorized, approved and adopted the proposed agreement and plan of merger
and the transactions contemplated by the merger agreement and the execution and
delivery of the merger agreement. That evening, NEES, National Grid Group and
NGG Holdings executed and delivered the merger agreement.
 
REASONS FOR THE MERGER AND THE RECOMMENDATION OF THE BOARD
 
    In determining to approve and recommend shareholders' approval of the
merger, and in reaching its determination that the merger is fair to and in the
best interests of the shareholders of NEES, the
 
                                       17
<PAGE>
Board consulted management and NEES's financial advisor, Merrill Lynch. The
Board considered a number of factors, including, without limitation, the
following:
 
    1.  the Board's review and analysis of NEES's business, financial condition,
earnings and prospects, as well as the competitive and changing regulatory
environment facing NEES;
 
    2.  historical market prices and trading information with respect to the
common shares;
 
    3.  a review of the possible alternatives to a sale of NEES in its entirety,
including the prospects of continuing to operate NEES as an independent
transmission and distribution company or acquiring other transmission and
distribution companies in the New England region, the value to shareholders of
such alternatives and the timing and likelihood of actually achieving additional
value from these alternatives; and the possibility that NEES's future
performance might not lead in the foreseeable future to a share price having a
higher present value than the Merger Consideration;
 
    4.  the Board's decision to approve the merger occurred only after (A)
Merrill Lynch contacted, on behalf of NEES, a number of potential business
partners over an extended period of time in a process that was designed to
elicit third party proposals to acquire or merge with NEES and enhance
shareholder value and (B) NEES met with and investigated these potential
business partners;
 
    5.  the minimum per share consideration of $53.75 to be paid in the merger
represents a premium for the common shares of approximately 25%, and the maximum
price per share of $54.35 represents a premium of 26.4%, in each case over the
closing price of $43.00 per common share on December 11, 1998, the last trading
day prior to the public announcement of the execution of the merger agreement;
 
    6.  the financial presentations of Merrill Lynch, NEES's financial advisor,
and its opinion dated December 11, 1998 to the Board as to the fairness of the
Merger Consideration from a financial point of view to the holders of common
shares as described in "--Opinion of the Financial Advisor;"
 
    7.  the terms of the merger agreement, including the right of the Board of
Directors of NEES to terminate the merger agreement prior to its approval by the
holders of NEES common shares in the exercise of its fiduciary duty in
connection with receipt by NEES of a proposal superior to that given by National
Grid Group; and
 
    8.  the likelihood of consummation of the merger, including an assessment
that National Grid Group has the financial capability to acquire NEES for the
Merger Consideration, and of the risks associated with obtaining necessary
approvals and the possibility that the merger may not be consummated even if
approved by shareholders. See "THE MERGER AGREEMENT--Conditions to Consummation
of the Merger."
 
    The foregoing discussion of the information and factors considered by the
Board is not intended to be all-inclusive. In determining to recommend the
approval of the merger, the Board also considered that the merger was in the
best interests of NEES's employees, customers and the communities that NEES
serves. In view of the wide variety of factors considered in connection with its
evaluation of the proposed merger, the Board did not find it practicable to, and
did not, quantify or otherwise attempt to assign relative weights to the
foregoing factors. Rather, the Board viewed its position and recommendation as
being based on the totality of the information presented to and considered by
it.
 
    THE BOARD HAS UNANIMOUSLY DETERMINED THAT THE MERGER IS FAIR TO AND IN THE
BEST INTERESTS OF SHAREHOLDERS AND HAS APPROVED THE MERGER. THE BOARD
UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS OF NEES VOTE FOR APPROVAL OF THE
MERGER.
 
    During its deliberations to approve the Agreement and Plan of Merger, dated
as of February 1, 1999 (the "EUA Merger Agreement"), by and among NEES, Research
Drive LLC and EUA pursuant to which Research Drive LLC will be merged with EUA
and EUA will thereby become a wholly-owned
 
                                       18
<PAGE>
subsidiary of NEES (the "EUA Merger"), the Board considered the impact of the
EUA Merger on the merger with National Grid Group from a regulatory standpoint
and concluded that the EUA Merger would not cause a material delay in the
consummation of, or otherwise adversely impact, NEES's merger with National Grid
Group. Prior to entering into the EUA Merger Agreement, NEES obtained National
Grid Group's consent to the EUA Merger, in accordance with the provisions of its
merger agreement with National Grid Group.
 
OPINION OF THE FINANCIAL ADVISOR
 
    On December 11, 1998, Merrill Lynch delivered its written and oral opinion,
subsequently confirmed in a written opinion dated as of the date of this proxy
statement, to the NEES Board of Directors to the effect that, as of such dates,
and based upon the assumptions made, matters considered and limits of review set
forth in such opinions, the Merger Consideration to be received by the holders
of NEES common shares in the merger was fair from a financial point of view to
such holders. References in this proxy statement to the "Merrill Lynch Opinion"
refer to the written opinion of Merrill Lynch dated as of the date of this proxy
statement.
 
    A COPY OF THE MERRILL LYNCH OPINION, WHICH SETS FORTH THE ASSUMPTIONS MADE,
MATTERS CONSIDERED AND CERTAIN LIMITATIONS ON THE SCOPE OF REVIEW UNDERTAKEN BY
MERRILL LYNCH, IS ATTACHED AS APPENDIX B TO THIS PROXY STATEMENT. EACH HOLDER OF
NEES COMMON SHARES IS URGED TO READ SUCH OPINION IN ITS ENTIRETY. THE MERRILL
LYNCH OPINION WAS INTENDED FOR THE USE AND BENEFIT OF THE NEES BOARD OF
DIRECTORS, WAS DIRECTED ONLY TO THE FAIRNESS FROM A FINANCIAL POINT OF VIEW OF
THE MERGER CONSIDERATION TO BE RECEIVED BY THE HOLDERS OF NEES COMMON SHARES,
DID NOT ADDRESS THE MERITS OF THE UNDERLYING DECISION BY NEES TO ENGAGE IN THE
MERGER AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY NEES SHAREHOLDER AS TO
HOW SUCH SHAREHOLDER SHOULD VOTE AT THE ANNUAL MEETING. THE MERGER CONSIDERATION
WAS DETERMINED ON THE BASIS OF NEGOTIATIONS BETWEEN NEES AND NATIONAL GRID GROUP
AND WAS APPROVED BY THE NEES BOARD OF DIRECTORS. THE SUMMARY OF THE MERRILL
LYNCH OPINION SET FORTH IN THIS PROXY STATEMENT IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO THE FULL TEXT OF THE MERRILL LYNCH OPINION, WHICH IS ATTACHED AS
APPENDIX B HERETO.
 
    In arriving at the Merrill Lynch Opinion, Merrill Lynch, among other things:
 
    1.  reviewed certain publicly available business and financial information
       relating to NEES and EUA that Merrill Lynch deemed to be relevant;
 
    2.  reviewed certain information, including financial forecasts, relating to
       the business, earnings, cash flow, assets, liabilities and prospects of
       NEES, both on a stand-alone basis and on a pro forma basis assuming the
       consummation of the EUA Merger, furnished to Merrill Lynch by NEES and
       EUA, as the case may be, as well as the amount and timing of the cost
       savings and related expenses and synergies expected to result from the
       EUA Merger (the "EUA Expected Synergies") furnished by NEES and EUA;
 
    3.  conducted discussions with members of senior management of NEES and EUA
       concerning the matters described in clauses 1 and 2 above, as well as the
       business and prospects of NEES, with and without giving effect to the EUA
       Merger and the EUA Expected Synergies;
 
    4.  reviewed the market prices and valuation multiples for NEES's common
       shares and compared them with those of certain publicly traded companies
       that Merrill Lynch deemed to be relevant;
 
    5.  reviewed the results of operations of NEES and compared them with those
       of certain publicly traded companies that Merrill Lynch deemed to be
       relevant;
 
    6.  compared the proposed financial terms of the merger with the financial
       terms of certain other transactions that Merrill Lynch deemed relevant;
 
                                       19
<PAGE>
    7.  participated in certain discussions and negotiations among
       representatives of NEES, National Grid Group, EUA and their financial and
       legal advisors;
 
    8.  reviewed the merger agreement;
 
    9.  reviewed the terms and conditions of the EUA Merger Agreement; and
 
    10. reviewed such other financial studies and analyses and took into account
       such other matters as Merrill Lynch deemed necessary, including Merrill
       Lynch's assessment of general economic, market and monetary conditions.
 
    In preparing the Merrill Lynch Opinion, Merrill Lynch assumed that if the
EUA Merger is consummated, it will be consummated in accordance with the terms
and conditions of the EUA Merger Agreement.
 
    In preparing the Merrill Lynch Opinion, Merrill Lynch assumed and relied on
the accuracy and completeness of all information supplied or otherwise made
available to Merrill Lynch, discussed with or reviewed by or for Merrill Lynch,
or publicly available. Merrill Lynch did not assume any responsibility for
independently verifying such information or for undertaking an independent
evaluation or appraisal of any of the assets or liabilities of NEES or EUA, and
Merrill Lynch was not furnished with any such evaluation or appraisal. In
addition, Merrill Lynch did not assume any obligation to conduct any physical
inspection of the properties or facilities of NEES or EUA. With respect to the
financial forecast information and the EUA Expected Synergies furnished to or
discussed with Merrill Lynch by NEES or EUA, Merrill Lynch assumed that they had
been reasonably prepared and reflected the best currently available estimates
and judgment of NEES's or EUA's management as to the expected future financial
performance of NEES or EUA, as the case may be, and the EUA Expected Synergies.
 
    The Merrill Lynch Opinion was necessarily based upon market, economic and
other conditions as they existed and could be evaluated on, and upon the
information made available to Merrill Lynch as of, the date of the Merrill Lynch
Opinion. In addition, with the consent of NEES, Merrill Lynch assumed that all
necessary regulatory consents and approvals for the merger would be obtained and
that in the course of obtaining such consents and approvals, no restrictions
would be imposed that would have a material adverse effect on the parties or
that would materially impair the ability of the parties to complete the merger
or the transactions contemplated by the merger agreement.
 
    The following is a summary of the material financial and comparative
analyses performed by Merrill Lynch in connection with the Merrill Lynch opinion
delivered to the NEES Board of Directors on December 11, 1998. The analyses
summarized below did not take into account the potential effect of the EUA
Merger that was entered into subsequent to the December 11, 1998 meeting of the
NEES Board of Directors. NEES did not request from Merrill Lynch, and Merrill
Lynch did not provide to NEES, an update of the following analyses to reflect
the possible impact of the EUA Merger on the merger with National Grid Group.
However, Merrill Lynch did consider the proposed EUA Merger in delivering its
opinion dated as of the date of this proxy statement.
 
    SHARE PRICE STUDY
 
    Merrill Lynch reviewed historical trading information for NEES's common
shares. This review indicated that for the 52-week period ended December 8,
1998, the per share closing price of the common shares ranged between $39.25 and
$45.69. Additionally, the average closing price of the common shares over the
20-day period ended December 8, 1998 was calculated to be $42.34 (the "20-Day
Average Price"). Merrill Lynch also compared the trading prices of the common
shares for the one-year period and the three-year period ended December 8, 1998
to the S&P Electric Utility Index.
 
                                       20
<PAGE>
    DISCOUNTED CASH FLOW ANALYSIS
 
    Merrill Lynch derived estimated per share equity valuation ranges for NEES
by performing discounted cash flow ("DCF") analyses. To perform these DCF
analyses, Merrill Lynch analyzed NEES's principal ongoing regulated utility
operations (the "Regulated Operations"), certain cash flows related to contract
termination charges in respect of NEES's stranded costs ("CTCs") and NEES's
other businesses (the "Other Businesses").
 
    In the case of the Regulated Operations, the DCF was calculated assuming
discount rates ranging from 6.5% to 7.5% and was comprised of the sum of the
present values of (1) the projected unlevered free cash flows for the years 1999
to 2004 as estimated by NEES and (2) the year 2004 terminal value based upon (a)
a range of multiples of projected year 2004 net income of from 14.0x to 16.0x
and (b) a range of multiples of projected year 2004 book value of from 1.60x to
2.00x. The DCF for the CTCs was calculated assuming discount rates ranging from
4.8% to 5.8% and was comprised of the sum of the present values of the projected
unlevered free cash flows for the years 1999 through 2009 as estimated by NEES.
The CTCs were assumed to have no value after 2009. For the Other Businesses, the
DCF was calculated assuming discount rates ranging from 10.0% to 11.0% and was
comprised of the sum of the present values of (1) the projected unlevered free
cash flows for the years 1999 to 2004 as estimated by NEES and (2) the year 2004
terminal value based upon a range of multiples of projected year 2004 net income
ranging from 11.0x to 13.0x. Merrill Lynch also reviewed for the Other
Businesses the total per share amount of gross investment by NEES in the Other
Businesses, including projected amounts to be invested in 1999, on a
dollar-for-dollar basis (the "1999E Investment Method").
 
    These analyses resulted in an aggregate implied equity value per NEES common
share (net of outstanding debt) that ranged from $37.54 to $44.31 under the net
income method (except for the CTCs, which were valued solely on projected 1999
to 2009 cash flows) and from $35.47 to $42.88 under the book value method
(except for the CTCs, which were valued solely on projected 1999 to 2009 cash
flows, and the Other Businesses, which were valued using the 1999E Investment
Method).
 
    PUBLICLY TRADED COMPARABLE COMPANY ANALYSIS
 
    Using publicly available information, Merrill Lynch compared certain
financial and operating information and ratios (described below) for NEES with
the corresponding financial and operating information and ratios for separate
groups of publicly traded companies that Merrill Lynch deemed to be reasonably
comparable to NEES. The companies included in the analysis were: BEC Energy,
Consolidated Edison, Inc., Commonwealth Energy System, EUA, GPU, Inc., and The
Montana Power Company (collectively, the "NEES Comparables").
 
    Merrill Lynch derived estimated valuation ranges for NEES by comparing as of
December 8, 1998:
 
    1.  current trading value as a multiple of projected 1999 earnings per share
       ("EPS") for the NEES Comparables, which estimates were obtained from
       Institutional Brokers Estimate System (as of December 8, 1998), and
       ranged from 13.5x to 21.3x, with a mean of 15.8x (as compared to NEES at
       14.1x);
 
    2.  current trading value as a multiple of the quotient obtained by dividing
       estimated 1999 price to earnings ratio for NEES's common shares by the
       five year estimated EPS growth rate for the NEES Comparables ("1999
       Growth Rate Multiple"), and ranged from 3.7x to 7.9x, with a mean of 5.3x
       (as compared to NEES at 5.4x); and
 
                                       21
<PAGE>
    3.  current trading value as a multiple of book value for the NEES
       Comparables, which ranged from 1.38x to 2.81x, with a mean of 1.93x (as
       compared to NEES at 1.62x).
 
    These three analyses resulted in corresponding estimated per share ranges of
values of NEES common shares (based on approximately 59.34 million shares
outstanding) of:
 
    1.  $43.29 to $51.58 (based on the 1999 EPS method and using a relevant
       range of valuation multiples of 14.1x to 16.8x);
 
    2.  $31.13 to $42.30 (based on the 1999 Growth Rate Multiples method and
       using a relevant range of valuation multiples of 3.9x to 5.3x); and
 
    3.  $44.30 to $49.98 (based on the book value method and using a relevant
       range of valuation multiples of 1.64x to 1.85x).
 
    COMPARABLE TRANSACTION ANALYSIS
 
    Merrill Lynch reviewed certain publicly available information regarding 11
selected business combinations in the utility industry announced since August
1995 (collectively, the "Comparable Transactions") that Merrill Lynch deemed
relevant in evaluating the merger. The Comparable Transactions and the dates
these transactions were announced are as follows:
 
    1.  PacifiCorp and Scottish Power plc (December 1998);
 
    2.  Commonwealth Energy System and BEC Energy (December 1998);
 
    3.  CILCORP Inc. and The AES Corporation (November 1998);
 
    4.  MidAmerican Energy Holdings Company and CalEnergy Company, Inc. (August
       1998);
 
    5.  Orange and Rockland Utilities, Inc. and Consolidated Edison, Inc. (May
       1998);
 
    6.  Central and South West Corporation and American Electric Power Company,
       Inc. (December 1997);
 
    7.  KU Energy Corporation and LG&E Energy Corp. (May 1997);
 
    8.  DQE, Inc. and Allegheny Energy, Inc. (April 1997);
 
    9.  Centerior Energy Corporation and Ohio Edison Company (September 1996);
 
    10. Potomac Electric Power Company and Baltimore Gas & Electric Company
       (September 1995); and
 
    11. CIPSCO Incorporated and Union Electric Company (August 1995).
 
    With respect to the Comparable Transactions, Merrill Lynch compared the
"offer value" (generally defined as the per share offer price for the acquired
company multiplied by the sum of the number of acquired company shares
outstanding and the number of acquired company options outstanding (net of
option proceeds)) of each such transaction:
 
    1.  as a percentage acquisition premium to the stock price of the acquired
       company prior to the date of announcement,
 
    2.  as a multiple of the next four quarter's estimated EPS of the acquired
       company at the date of announcement ("Forward EPS"), and
 
    3.  as a multiple of the book value of the acquired company at the date of
       the announcement.
 
                                       22
<PAGE>
    The results of these analyses were as follows:
 
    1.  the acquisition premiums for such transactions ranged from 17% to 43%,
       with a mean of 28%;
 
    2.  the multiples of offer value to Forward EPS ranged from 11.1x to 19.7x,
       with a mean of 17.0x (excluding from the calculation of the mean the
       Centerior Energy Corporation/Ohio Edison Company transaction); and
 
    3.  the multiples of the offer value to book value ranged from 0.84x to
       2.65x, with a mean of 1.97x (excluding from the calculation of the mean
       the KU Energy Corporation/LG&E Energy Corp. and Centerior Energy
       Corporation/Ohio Edison Company transactions).
 
    These analyses resulted in corresponding estimated per share ranges of
values of NEES common shares (based on approximately 59.34 million shares
outstanding) of:
 
    1.  $50.68 to $59.77 (using a relevant range of acquisition premiums of 17%
       to 38%);
 
    2.  $49.43 to $60.48 (using a relevant range of multiples of offer value to
       Forward EPS of 16.1x to 19.7x); and
 
    3.  $45.93 to $52.68 (using a relevant range of multiples of offer value to
       book value of 1.70x to 1.95x).
 
    SENSITIVITY ANALYSIS
 
    Merrill Lynch performed a sensitivity analysis with respect to the Merger
Consideration by analyzing an "adjusted offer value" for the Merger
Consideration which took into account the effect on the present value of the
offer price at various closing periods ranging from 12 to 18 months (the
"Adjusted Offer Value"). The Adjusted Offer Value represented the sum, for each
estimated closing period, of (1) the offer price of $53.75 per common share
discounted over the relevant period; (2) the present value of NEES's quarterly
dividends of $0.59 per share over the relevant period; and (3) the present value
over the relevant period of the indexing payments of $0.30 per quarter, to the
extent provided for in the merger agreement. The calculations used a discount
rate of 9.1%. This analysis resulted in the following Adjusted Offer Values (1)
$51.77 for a 12-month closing period, (2) $51.50 for a 15-month closing period,
and (3) $50.97 for an 18-month closing period.
 
    Merrill Lynch also compared an assumed offer price of $54.05 (the "Assumed
Offer Price"), reflecting the $53.75 base offer price plus an assumed $.30
indexing payment, as a premium to the trading price of NEES common shares on
December 8, 1998 and to the 20-Day Average Price. These comparisons resulted in
the Assumed Offer Price representing a 24.8% premium over the December 8, 1998
trading price and a 27.6% premium over the 20-Day Average Price.
 
    The summary set forth above does not purport to be a complete description of
the analyses performed by Merrill Lynch in arriving at the Merrill Lynch
opinions. The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to partial or summary description. Merrill Lynch
believes that its analyses must be considered as a whole and that selecting
portions of its analyses and the factors considered by it, without considering
all such factors and analyses, could create a misleading view of the processes
underlying the Merrill Lynch opinions. Merrill Lynch did not assign relative
weights to any of its analyses in preparing the Merrill Lynch opinions. The
matters considered by Merrill Lynch in its analyses were based on numerous
macroeconomic, operating and financial assumptions with respect to industry
performance, general business and economic conditions and other matters, many of
which are beyond NEES's and Merrill Lynch's control and involve the application
of complex methodologies and educated judgment. Any estimates contained in the
analyses performed by Merrill Lynch are not necessarily indicative of actual
past or future results or values, which may be
 
                                       23
<PAGE>
significantly more or less favorable than such estimates. Estimated values do
not purport to be appraisals and do not necessarily reflect the prices at which
businesses or companies may be sold in the future, and such estimates are
inherently subject to uncertainty.
 
    No public company utilized as a comparison in the analyses described above
is identical to NEES, and none of the Comparable Transactions utilized as a
comparison is identical to the proposed merger. In addition, various analyses
performed by Merrill Lynch incorporate projections prepared by research analysts
using only publicly available information. Such estimates may or may not prove
to be accurate. An analysis of publicly traded comparable companies and
comparable business combinations is not mathematical; rather it involves complex
considerations and judgments concerning differences in financial and operating
characteristics of the comparable companies and other factors that could affect
the public trading value of the comparable companies or company to which they
are being compared.
 
    The NEES Board of Directors selected Merrill Lynch to act as its financial
advisor because of Merrill Lynch's reputation as an internationally recognized
investment banking firm with substantial experience in transactions similar to
the merger and because Merrill Lynch is familiar with NEES and its business. As
part of its investment banking business, Merrill Lynch is regularly engaged in
the valuation of businesses and their securities in connection with mergers and
acquisitions, leveraged buyouts, negotiated underwritings, secondary
distributions of listed and unlisted securities and private placements.
 
    In accordance with a letter agreement between NEES and Merrill Lynch dated
as of November 4, 1996, as amended by a letter agreement dated December 1, 1998,
NEES has agreed to pay Merrill Lynch upon consummation of the merger, a fee of
approximately $11,200,000 (the "Merger Fee"). The Merger Fee is payable in three
installments as follows: (a) 25% upon the execution of the merger agreement, (b)
25% upon the approval of the merger by NEES's shareholders, and (c) any
remaining unpaid portion upon the closing of the merger. In the event the merger
is not consummated and NEES receives a termination fee from National Grid Group,
NEES has agreed to pay Merrill Lynch 10% of such fee (excluding any payment to
NEES related to the reimbursement of actual out-of-pocket expenses incurred by
NEES, with the proviso that the fee payable to Merrill Lynch described in this
sentence shall not be considered an out-of-pocket expense), less any portion of
the Merger Fee previously paid to Merrill Lynch. NEES has also agreed to
reimburse Merrill Lynch for its reasonable out-of-pocket expenses (including the
reasonable fees and disbursements of legal counsel) and to indemnify Merrill
Lynch and certain related parties from and against certain liabilities,
including liabilities under the federal securities laws arising out of its
engagement.
 
    Merrill Lynch is currently providing financial advisory services to NEES in
connection with the pending EUA Merger, and has, in the past, provided financial
advisory and financing services to NEES and/or its affiliates and may continue
to do so, and has received, and may continue to receive, fees for the rendering
of such services. In addition, in the ordinary course of its business, Merrill
Lynch may actively trade the NEES common shares and other securities of NEES and
the shares of common stock of EUA and other securities of EUA, as well as
securities of National Grid Group, for its own account and for the accounts of
customers and, accordingly, may at any time hold a long or short position in
such securities.
 
ACCOUNTING TREATMENT OF THE MERGER
 
    The merger will be accounted for as an acquisition of NEES by National Grid
Group from the date of the acquisition. The difference between the fair value of
the purchase consideration and the fair value of the identified assets acquired
will be accounted for as goodwill. National Grid will account for the merger in
accordance with U.K. generally accepted accounting principles.
 
                                       24
<PAGE>
CERTAIN FEDERAL INCOME TAX CONSEQUENCES TO SHAREHOLDERS
 
    The following is a summary of certain federal income tax consequences of the
merger to holders of common shares. The discussion is for general information
only and does not purport to consider all aspects of federal income taxation
that might be relevant to holders of common shares. The discussion is based on
provisions of the Internal Revenue Code of 1986, as amended (the "Code"),
existing regulations promulgated thereunder and administrative and judicial
interpretations thereof, all as in effect as of the date hereof and all of which
are subject to change (possibly with retroactive effect). The discussion applies
only to shareholders for whom common shares are capital assets within the
meaning of Section 1221 of the Code, and does not apply to common shares
received pursuant to the exercise of an employee option or otherwise as
compensation, common shares held as part of a "straddle," "hedge," "conversion
transaction," "synthetic security," or other integrated investment, or to
certain types of shareholders (including, without limitation, financial
institutions, insurance companies, tax-exempt organizations and broker-dealers)
who may be subject to special rules. This discussion does not discuss the
federal income tax consequences to a shareholder who, for federal income tax
purposes, is a non-resident alien individual, a foreign corporation, a foreign
partnership or a foreign estate or trust, nor does it consider the effect of any
foreign, state, local or other tax laws.
 
    BECAUSE INDIVIDUAL CIRCUMSTANCES MAY DIFFER, HOLDERS OF COMMON SHARES SHOULD
CONSULT THEIR TAX ADVISORS TO DETERMINE THE TAX EFFECTS TO SUCH SHAREHOLDER OF
THE MERGER, INCLUDING THE APPLICATION AND EFFECT OF FOREIGN, STATE, LOCAL AND
OTHER TAX LAWS.
 
    The receipt of cash for common shares because of the merger will be a
taxable transaction for federal income tax purposes, and may also be a taxable
transaction under applicable foreign, state, local or other tax laws. For
federal income tax purposes, a shareholder generally will recognize capital gain
or loss equal to the difference between the amount of cash received and such
shareholder's adjusted tax basis in the common shares surrendered. Gain or loss
must be determined separately for each block of common shares held (for example,
common shares acquired at the same cost in a single transaction).
 
    Net capital gain recognized by individuals from the sale of property held
for more than 12 months will generally be taxed at a maximum rate of 20% for
federal income tax purposes (or 10% if the capital gain would be taxed at only a
15% rate if such gain were treated as ordinary income). There are limitations on
the deductibility of capital losses.
 
    Payments in connection with the merger may be subject to "backup
withholding" at a rate of 31%, unless a shareholder of common shares (1)
provides a correct taxpayer identification number ("TIN") (which, for an
individual shareholder, is the shareholder's social security number) and any
other required information to the paying agent, or (2) is a corporation or comes
within certain exempt categories and, when required, demonstrates this fact, and
otherwise complies with applicable requirements of the backup withholding rules.
A shareholder who does not provide a correct TIN may be subject to penalties
imposed by the Internal Revenue Service. Any amount paid as backup withholding
does not constitute an additional tax and will be creditable against the
shareholder's federal income tax liability. Each shareholder should consult with
its own tax advisor as to such shareholder's qualification for exemption from
backup withholding and the procedure for obtaining such exemption. SHAREHOLDERS
MAY PREVENT BACKUP WITHHOLDING BY COMPLETING A SUBSTITUTE FORM W-9 AND
SUBMITTING IT TO THE PAYING AGENT FOR THE MERGER WHEN THEY SUBMIT THEIR SHARE
CERTIFICATE(S) FOLLOWING THE EFFECTIVE TIME OF THE MERGER.
 
                               REGULATORY MATTERS
 
    Certain federal and state regulatory requirements must be complied with
before the merger is consummated. NEES and National Grid Group are not aware of
any material governmental consents or approvals that are required prior to the
parties' consummation of the merger other than those described below. It is
presently contemplated that if any such additional governmental consents and
 
                                       25
<PAGE>
approvals are required, such consents and approvals will be sought. While there
can be no assurance that the consents or approvals described below or any such
additional consents or approvals will be obtained, the directors of NEES and
National Grid Group believe that the necessary approvals can be obtained by
early 2000.
 
HSR ACT
 
    The merger is subject to the requirements of the HSR Act and the rules and
regulations thereunder, which provide that certain acquisition transactions may
not be consummated until certain information has been furnished to the Antitrust
Division of the Department of Justice (the "Antitrust Division") and the Federal
Trade Commission (the "FTC") and until certain waiting periods have been
terminated or have expired. The expiration or earlier termination of the HSR Act
waiting period would not preclude the Antitrust Division or the FTC from
challenging the merger on antitrust grounds. Neither NEES nor National Grid
Group believes that the merger will violate federal antitrust laws. If the
merger is not consummated within 12 months after the expiration or earlier
termination of the initial HSR Act waiting period, NEES and National Grid Group
would be required to submit new information to the Antitrust Division and the
FTC, and a new HSR Act waiting period would have to expire or be earlier
terminated before the merger could be consummated. NEES and National Grid Group
intend to file their premerger notifications in the spring of 1999.
 
FEDERAL POWER ACT
 
    Section 203 of the Federal Power Act (the "FPA") provides that no public
utility may sell or otherwise dispose of its facilities subject to the
jurisdiction of the FERC or, directly or indirectly, merge or consolidate such
facilities with those of any other person or acquire any security of any other
public utility without first having obtained authorization from the FERC.
Because this transaction involves a change in ownership and control of NEES's
public utility subsidiaries, the prior approval of the FERC under FPA Section
203 is required in order to consummate the merger.
 
    Under Section 203 of the FPA, the FERC is directed to approve a merger if it
finds such merger "consistent with the public interest." In reviewing a merger,
the FERC generally evaluates: (1) whether the merger will adversely affect
competition; (2) whether the merger will adversely affect rates; and (3) whether
the merger will impair the effectiveness of regulation. NEES and National Grid
Group believe the proposed merger satisfies these standards.
 
    NEES's public utility subsidiaries filed an application with the FERC on
March 10, 1999 requesting that the FERC approve the merger under Section 203 of
the FPA. The FERC issued a notice on March 10, 1999, indicating the comment
period relating to this application expires on May 10, 1999.
 
NUCLEAR REGULATORY COMMISSION
 
    Since a subsidiary of NEES holds licenses issued by the Nuclear Regulatory
Commission ("NRC") in connection with that subsidiary's interests in various
nuclear power plants and also holds minority common stock interests in
corporations that hold such licenses, the merger (which would constitute an
indirect transfer of NEES's subsidiary's licenses to National Grid Group)
requires NRC approval under the Atomic Energy Act of 1954. The Atomic Energy Act
effectively prohibits foreign ownership or control of a nuclear licensee (as
distinct from the physical plant). National Grid Group is a foreign entity
within the meaning of the Atomic Energy Act. NEES and National Grid Group
believe they can satisfy NRC concerns about foreign ownership and control. The
NEES subsidiary's minority interests in the common stock of corporations that
hold nuclear licenses does not give NEES control over such facilities or the
licensee for the facilities, and therefore the indirect acquisition by National
Grid Group of NEES's interest will not be inconsistent with the Atomic Energy
Act. In addition, although a NEES subsidiary owns a minority interest in two
nuclear facilities and therefore has minority, non-operating
 
                                       26
<PAGE>
ownership licenses with respect to those facilities, the NEES subsidiary has no
control over the facilities themselves, and a recently issued NRC review
procedure regarding foreign ownership or control provides that foreign ownership
of such minority non-operating licenses is permissible, provided that the
licensee agrees to conditions that prevent foreign domination or control of the
facility. NEES and National Grid Group have filed an application with the NRC
agreeing to such conditions on March 16, 1999. The foreign ownership issue could
extend the time otherwise required for NRC approval of license transfers related
to the merger.
 
STATE REGULATORY APPROVALS
 
    The formal approval of the Massachusetts Department of Telecommunications
and Energy ("MDTE") and the Rhode Island Public Utilities Commission ("RIPUC")
is not required; however, NEES will seek the support of both of these agencies
for NEES's application to the Commission under the Public Utility Holding
Company Act of 1935, as amended (the "1935 Act"). NEES made an informational
filing with the MDTE on March 9, 1999; a copy of the MDTE filing was provided to
the RIPUC. NEES does not intend to make any formal filing with the RIPUC because
it believes that none is required.
 
    The New Hampshire Public Utilities Commission ("NHPUC") has jurisdiction to
review the merger. However, NHPUC approval of the merger is not required if
NEES's subsidiaries which operate in New Hampshire represent to the NHPUC at
least thirty days prior to completion of the transaction that the merger will
not adversely affect their rates, terms, service, or operations. On March 18,
1999, these NEES subsidiaries submitted the requisite representation, obviating
formal review and approval by the NHPUC.
 
    In accordance with Vermont law, the approval of the Vermont Public Service
Board (the "VPSB") will be required for the merger. In addition, in accordance
with Connecticut law, the Connecticut Department of Public Utility Control (the
"CDPUC") will be required to approve the merger. NEES and National Grid Group
plan to file appropriate applications in late March or early April 1999 with the
VPSB and the CDPUC.
 
SECURITIES AND EXCHANGE COMMISSION APPROVAL PURSUANT TO 1935 ACT
 
    Section 9(a)(2) of the 1935 Act provides that it is unlawful, without the
prior approval of the SEC, for any person to acquire any security of any public
utility company if that person already owns 5% or more of the voting securities
of another public utility company, or will by virtue of that transaction come to
own 5% or more of the voting securities of two or more public utility companies.
As a result of the merger, National Grid Group, which is currently a foreign
corporation not registered under the 1935 Act, will be deemed to acquire
directly or indirectly all of the common shares of NEES, a registered public
utility holding company under the 1935 Act which owns several public utility
company subsidiaries. Accordingly, National Grid Group is required to obtain
prior SEC approval under Section 9(a)(2) of the 1935 Act to consummate the
merger. An application for approval of the merger will be filed by National Grid
Group at the appropriate time. Under the applicable standards of the 1935 Act,
the SEC is directed to approve a proposed acquisition unless it finds that (1)
the acquisition would tend towards detrimental interlocking relations or a
detrimental concentration of control, (2) the consideration to be paid in
connection with the acquisition is not reasonable, (3) the acquisition would
unduly complicate the capital structure of the applicant's holding company
system or would be detrimental to the proper functioning of the applicant's
holding company system, or (4) the acquisition would violate applicable state
law. In order to approve a proposed acquisition, the SEC also must find that the
acquisition would tend towards the development of an integrated public utility
system and would otherwise conform to the 1935 Act's integration and corporate
simplification standards.
 
                                       27
<PAGE>
    NEES is currently a public utility holding company registered under Section
5 of the 1935 Act, and will continue to be a registered public utility holding
company upon consummation of the merger. National Grid Group does not currently
have U.S. utility operations and is not currently subject to the jurisdiction of
the 1935 Act. After consummation of the merger, National Grid Group will become
a public utility holding company and will register under the 1935 Act. To date
no public utility holding company incorporated outside of the United States has
been registered under Section 5; however, the 1935 Act does not expressly
prohibit a non-U.S. holding company from acquiring a U.S. utility nor does it
prohibit registration of such a holding company. Because of the magnitude of the
National Grid Group's operations outside the United States and the degree of
potential regulation of those operations under the 1935 Act, the merger raises
issues that have not been previously decided by the SEC under the 1935 Act.
Although NEES and National Grid Group believe that SEC approval of the merger
under the 1935 Act on terms acceptable to both parties will be obtained, it is
not possible to predict with certainty the timing of such approval and whether
the approval will be on terms acceptable to National Grid Group and NEES.
 
EXON-FLORIO
 
    The Committee on Foreign Investment in the United States ("CFIUS") may
review and investigate the merger under Exon-Florio, and the President of the
United States or his designee is empowered to take certain actions in relation
to mergers, acquisitions and takeovers by foreign persons which could result in
foreign control of persons engaged in interstate commerce in the Unites States
pursuant to Exon-Florio. In particular, Exon-Florio enables the President to
block or reverse any acquisitions by foreign persons which threaten to impair
the national security of the Unites States. Before the merger may be
consummated, any CFIUS review and investigation of the merger under Exon-Florio
must have terminated, and the President must not have taken any of his
authorized actions under Exon-Florio. NEES and National Grid Group believe that
the merger does not threaten to impair the national security of the United
States and that the merger will receive Exon-Florio clearance.
 
GENERAL
 
    It is a condition to the consummation of the merger that final orders
approving the merger be obtained from the various federal and state regulators
described above. Under the merger agreement, NEES, National Grid Group and NGG
Holdings have agreed to use their best efforts to obtain all governmental
authorizations necessary or advisable to consummate or effect the transactions
contemplated by the merger agreement. Various parties may seek intervention in
these proceedings to oppose the merger or to have conditions imposed upon the
receipt of necessary approvals. While there can be no assurance as to the timing
of such approvals or the ability of such parties to obtain such approvals on
satisfactory terms or otherwise, the directors of NEES and National Grid Group
believe that all necessary approvals will be received by early 2000.
 
                         CERTAIN EFFECTS OF THE MERGER
 
    At the effective time of the merger, (1) NGG Holdings will merge with and
into NEES and the separate corporate existence of NGG Holdings will cease, (2)
NEES will be the surviving entity in the merger, and (3) the Surviving Entity
will be a wholly owned subsidiary of National Grid Group. National Grid Group
has informed NEES that as soon as possible following the merger closing,
National Grid Group intends to amend the NEES Agreement and Declaration of Trust
to permit a merger of NEES into a Massachusetts business corporation. As soon as
possible following such amendment, National Grid Group intends to merge NEES
with and into a newly-formed, wholly-owned subsidiary of National Grid Group,
which will be a Massachusetts business corporation. At that time, the separate
existence of NEES will cease. The entity surviving the merger of NGG Holdings
with and into NEES and the subsequent merger of NEES with and into another
wholly-owned subsidiary of National Grid Group is herein referred to as the
"Surviving Entity".
 
                                       28
<PAGE>
    As a result of the merger, the common shares of NEES will no longer be
publicly traded. Following the merger, persons who were shareholders of NEES
immediately prior to the merger will no longer have an opportunity to continue
their interests in NEES as an ongoing business entity and therefore will not
share in its future earnings and potential growth.
 
    Trading in the common shares of NEES on the NYSE will cease immediately
following the effective time of the merger. At such effective time, the common
shares will be delisted from the NYSE. Registration of the common shares under
the Securities Exchange Act of 1934, as amended (the "Exchange Act") also will
be terminated, as will the ongoing disclosure requirements thereunder with
respect to the common shares.
 
                             CONFLICTS OF INTEREST
 
GENERAL
 
    Certain executive officers and certain members of the Board of Directors of
NEES may be deemed to have interests in the merger that are in addition to their
interests as shareholders of NEES generally. The Board was aware of these
interests and considered them, among other matters, in approving the merger
agreement and the transactions contemplated by the merger agreement.
 
INDEMNIFICATION, DIRECTORS AND OFFICERS INSURANCE
 
    Directors, officers and presently covered current or former employees of
NEES will be indemnified to the fullest extent permitted by applicable law
against any claim arising prior to the merger relating to (1) the fact that such
person is or was a director, officer or employee of NEES or any of its
subsidiaries and (2) the merger agreement or the transactions contemplated by
the merger agreement. For a period of six years following the merger, National
Grid Group and the Surviving Entity shall, at National Grid Group's election:
(1) cause to be maintained an extended reporting period for current D&O
liability insurance on terms no less favorable than the terms of such current
coverage or (2) provide tail coverage for six years for acts prior to the
effective time of the merger on terms no less favorable than the terms of such
current insurance coverage.
 
SEVERANCE AGREEMENTS
 
    NEES is a party to agreements with each of Mr. Sergel, Mr. Houston, Mr.
Jesanis, Ms. LaFleur, and Mr. Kennedy (each, an "Executive" and each agreement,
a "Severance Agreement"), which Severance Agreements were entered into in 1995
with Mr. Houston and on March 1, 1998 with the other Executives (and amended on
December 8, 1998 for Mr. Kennedy) and which remain in effect for the three year
period following (1) a "Change in Control" of NEES (as defined in the Severance
Agreements) or (2) a "Major Transaction" (as defined in the Severance
Agreements). In accordance with the terms of the Severance Agreements, if the
applicable Executive's employment is terminated within three years following the
event described in clause (1) or (2), as applicable, NEES will pay to the
Executive the severance payments and will provide to the Executive the severance
benefits described below, unless the Executive's employment is terminated (x) by
NEES for Cause, (y) by the Executive without Good Reason or (z) by reason of the
Executive's death, Disability or Retirement (each term, as defined in the
Severance Agreements).
 
    The shareholder approval of the merger agreement will constitute a Major
Transaction and the consummation of the transactions contemplated by the merger
will constitute a Change in Control. Accordingly, in the event an Executive's
employment is terminated within three years following the Major Transaction or
Change in Control, such Executive will be entitled to receive, in lieu of any
other payments due to the Executive: (1) a lump sum cash payment equal to three
times (two times, in certain cases) the sum of (a) the higher of (i) such
Executive's annual base compensation in effect at the time of termination and
(ii) such Executive's annual base compensation in effect immediately prior to
the Change in Control or Major Transaction and (b) the higher of (i) the average
of the annual
 
                                       29
<PAGE>
bonuses awarded to such Executive under the New England Electric Companies'
Senior Incentive Compensation Plan, New England Electric Companies' Incentive
Compensation Plan I, II and III and the Incentive Share Plan (collectively, the
"Incentive Plans") for the three performance years ended prior to the date of
termination and (ii) the average of the annual bonuses awarded to such Executive
pursuant to the Incentive Plans for the three performance years ended prior to
the Change in Control or Major Transaction; (2) a cash lump sum payment equal to
the excess of (a) the actuarial equivalent of the retirement pension which the
Executive would have accrued under the terms of each pension plan of NEES
(determined as if the Executive (i) were fully vested thereunder and had
accumulated 36 additional months (24 additional months, in certain cases) of
service credit thereunder and (ii) had been credited under each such pension
plan of NEES during such 36 month period with compensation at the higher of (A)
the Executive's compensation during the 12 months prior to the date of
termination and (B) the Executive's compensation during the 12 months ending on
the date of the Change in Control or Major Transaction) over (b) the actuarial
equivalent of the retirement pension which the Executive had actually accrued
pursuant to the provisions of NEES's pension plans as of the date of his or her
termination of employment; (3) the continuation of employee welfare benefits for
three years (two years, in certain cases) following the date of termination,
reduced to the extent the Executive receives such benefits from a subsequent
employer; (4) if the Executive would have otherwise been entitled to
post-retirement health care or life insurance had he continued to be employed
for three additional years (two additional years, in certain cases), such
post-retirement health care and life insurance commencing on the later of (a)
the date that such coverage would have first become available to the Executive
and (b) the date that the benefits described in clause (3) above terminate and
(5) the reimbursement of legal fees and expenses, if any, incurred by the
Executive in disputing any issue relating to the termination of his employment.
Notwithstanding the above, payments to be made and benefits to be provided to
the Executives will be reduced to the extent necessary to avoid imposition of
the excise tax (the "Excise Tax") pursuant to Section 4999 of the Code; in
certain cases, however, such payments and benefits will be reduced only if such
reduction would yield a greater result to the Executive than actual payment by
the Executive of the Excise Tax. Notwithstanding the foregoing, Mr. Sergel, in
lieu of such reduction, is entitled to an additional payment to hold him
harmless from the Excise Tax, if any, imposed on any payment to him. It is
estimated (based upon information currently available) that this additional
payment would be $2,127,338.
 
    In accordance with the terms of the Severance Agreements, it is presently
estimated (based upon information currently available) that the Executives would
be entitled to lump sum cash severance payments upon termination of employment
in the circumstances described above approximately in the following amounts: Mr.
Sergel, $3,630,475; Mr. Houston, $2,605,476; Mr. Jesanis, $1,282,398; Ms.
LaFleur, $1,280,037; and Mr. Kennedy, $736,060.
 
    Pursuant to the employment agreement to be entered into among NEES, National
Grid Group and Mr. Sergel on the effective date of the merger, Mr. Sergel will
waive his rights under his Severance Agreement.
 
NEW EMPLOYMENT AGREEMENTS
 
    NEES and National Grid Group have agreed to enter into a new employment
agreement with Mr. Sergel substantially in the form attached as Appendix E
hereto (the "Sergel Agreement"), which Sergel Agreement will be entered into on
the effective date of the merger. The Sergel Agreement provides for the
employment of Mr. Sergel as President and Chief Executive Officer of NEES for a
term of three years (such term, plus any extensions thereof, the "Employment
Period"), which three-year term will be extended for one additional day on each
day following the second anniversary of the effective date of the Sergel
Agreement (resulting, as of such second anniversary, in a perpetual one year
Employment Period) unless and until either party gives notice to the other that
the Employment Period shall not be so extended.
 
                                       30
<PAGE>
    The Sergel Agreement provides for an annual base salary (the "Annual Base
Salary") of $550,000 and a maximum annual bonus equal to (1) 50% of the Annual
Base Salary, payable in cash (the "Cash Bonus") and (2) 60% of the Cash Bonus,
payable in NEES phantom shares ("Phantom Shares"), which Phantom Shares will
have a three year vesting requirement. The Sergel Agreement also provides for
the participation by Mr. Sergel in the long-term equity arrangements of National
Grid Group, including a grant by National Grid Group, as soon as practicable
following the effective date of the Sergel Agreement, of an option (the
"National Grid Option") to acquire the number of shares of common stock of
National Grid Group such that the aggregate fair market value of such shares
equals three times the Annual Base Salary.
 
    The Sergel Agreement provides that Mr. Sergel's employment may be terminated
by NEES other than for Cause, death or Disability (each term, as defined in the
Sergel Agreement) or by Mr. Sergel for Good Reason (defined to include (1) the
assignment to Mr. Sergel of duties substantially inconsistent with his status as
a senior officer of NEES, (2) a reduction in the Annual Base Salary or any
breach by NEES of its obligations under the Sergel Agreement or by National Grid
Group of its obligation to grant the National Grid Option, (3) a relocation of
Mr. Sergel's principal place of employment to anywhere other than NEES's
headquarters or a relocation of NEES's headquarters to a location more than 150
miles from Westborough, MA, or (4) a termination of Mr. Sergel's employment not
effected pursuant to the procedural steps set forth in the Sergel Agreement). In
the event of a termination of Mr. Sergel's employment by NEES other than for
Cause, death or Disability or by Mr. Sergel for Good Reason, in either case
during the Employment Period, (a) NEES must pay to Mr. Sergel the Annual Base
Salary, Cash Bonus and Phantom Shares he would have received had he remained
employed by NEES (x) for a period of 36 months, if such termination of
employment occurs prior to the second anniversary of the effective date of the
merger or within 2 years following a Change in Control (as defined in the Sergel
Agreement, but not including the merger) or (y) for a period of 18 months, if
such termination of employment occurs following the second anniversary of the
effective date of the merger and either prior to a Change in Control or more
than 2 years following a Change in Control (the period described in (x) or (y)
above, as applicable, the "Severance Period"), (b) Mr. Sergel will be entitled
to continued participation in NEES's Supplemental Executive Retirement Plan and
all other health and welfare benefit plans of NEES (including but not limited to
all savings, incentive and retirement plans and all medical, dental, disability
and life insurance plans), (c) any restrictions on restricted stock outstanding
on the date of termination will lapse without regard to the termination of the
Executive's employment, (d) any outstanding incentive compensation awards with
vesting and/or payment contingent upon attainment of performance goals will be
deemed satisfied at 90% of "Maximum" level and paid, in a lump sum cash payment
within five days of the date of termination, pro rata for the portion of the
performance year through the date of termination, and (e) an additional payment
to hold Mr. Sergel harmless from the Excise Tax, if any, imposed on any payment
to him. At the conclusion of any contest regarding the validity of,
enforceability of, or liability under, the Sergel Agreement, NEES will pay all
legal fees, court costs and litigation expenses reasonably incurred by Mr.
Sergel in such contest (so long as any claims made by Mr. Sergel are not found
frivolous or without merit).
 
    National Grid Group has acknowledged that, by virtue of the consummation of
the merger, Alfred D. Houston will have, in accordance with the terms of the
Severance Agreement (the "Houston Agreement") dated February 28, 1995, between
Mr. Houston and NEES, Good Reason (as defined in the Houston Agreement) to
terminate his employment with NEES. National Grid Group has also agreed that,
following the closing date, it will enter into a consulting agreement with Mr.
Houston, which consulting agreement will have a term of two years and pursuant
to which Mr. Houston will be paid $200,000 per year. This consulting agreement
is attached as Appendix F to this document.
 
                                       31
<PAGE>
LONG-TERM PERFORMANCE SHARE AWARD PLAN
 
    Under the Long-Term Performance Share Award Plan (the "PSA Plan"), eligible
participants are granted performance shares (each of which performance shares is
equal to a common share) with a value equal to a portion of the participant's
base salary at the start of each year. The number of performance shares actually
earned at the end of the three-year performance cycle is based on NEES's
performance during such performance cycle, measured relative to pre-established
performance criteria.
 
    As soon as practicable following the close of a performance cycle, NEES's
performance is evaluated and the number of performance shares earned is
determined for each participant.
 
    In the event of a Change in Control during a performance cycle, each
participant will receive a cash payment equal to (1) the number of performance
shares granted to the participant, multiplied by (2) the average of the target
achievement percentages for the Incentive Compensation Plan I for the three
years prior to the Change in Control (or, in the case of performance cycles
ending after December 31, 2000, the average of the goal achievements for the PSA
Plan for the three years prior to the Change in Control).
 
    Consummation of the merger will constitute a Change in Control under the PSA
Plan. Accordingly, following consummation of the merger, the Executives will
receive approximately the following amounts: Mr. Sergel, $644,593; Mr. Houston,
$743,611; Mr. Jesanis, $306,290; Ms. LaFleur, $378,681; and Mr. Kennedy,
$226,356.
 
DEFERRED COMPENSATION PLAN
 
    The Deferred Compensation Plan provides that each participant can elect to
defer up to 15% of his or her base salary or all of his or her Incentive
Compensation, Incentive Shares and Performance Shares (as defined in the
Deferred Compensation Plan) and can elect, subject to certain conditions, to
have the entire balance in his or her account distributed ten years following
the deferral or in a lump sum or a series of annual payments commencing upon
retirement. Within the 12 months following a Change in Control or a Major
Transaction, each participant may elect to receive a payment equal to 90% of (1)
the balance in such participant's account and (2) the actuarial value of certain
insurance benefits purchased under a prior version of the Deferred Compensation
Plan. Shareholder approval of the merger agreement will constitute a Major
Transaction and the consummation of the transactions contemplated by the merger
agreement will constitute a Change in Control for purposes of the Deferred
Compensation Plan. Accordingly, following shareholder approval of the merger,
the Executives could receive approximately the following amounts of their
previously deferred compensation: Mr. Sergel, $748,688; Mr. Houston, $1,066,842;
Mr. Jesanis, $341,323; Ms. LaFleur, $343,267; and Mr. Kennedy, $480,557. In
addition, director Joan T. Bok could receive approximately $5,399,527.
 
SENIOR INCENTIVE COMPENSATION PLAN; INCENTIVE COMPENSATION PLAN I; INCENTIVE
  COMPENSATION PLAN II; INCENTIVE COMPENSATION PLAN III; INCENTIVE SHARE PLAN
 
    Each of these plans (the "Incentive Compensation Plans") provides for annual
cash bonuses (the "Cash Bonus") equal to a percentage (the "Percentage") of each
participant's base salary to be paid to participants based upon the extent of
the achievement of certain pre-established goals. Each of the Incentive
Compensation Plans provides that, in the event of a Change in Control, each
participant will receive a cash payment equal to the participant's base salary,
multiplied by the average of the Percentages for the applicable Incentive
Compensation Plan for the three years prior to the Change in Control. In
addition, if the Change in Control occurs prior to the determination and payment
of the Cash Bonus under the applicable Incentive Compensation Plan for the prior
year, each participant will receive a cash payment equal to the applicable
Percentage multiplied by the participant's base salary received in the prior
year.
 
                                       32
<PAGE>
    Consummation of the merger will constitute a Change in Control under the
Incentive Compensation Plans. Accordingly, following consummation of the merger,
the Executives will receive approximately the following amounts: Mr. Sergel,
$262,488; Mr. Houston, $238,625; Mr. Jesanis, $108,859; Ms. LaFleur, $104,916;
and Mr. Kennedy, $94,246.
 
    Under the terms of the Incentive Share Plan, participants receive annual
grants of that number of common shares equal in value to a percentage of the
participant's Cash Bonus earned under the applicable Incentive Compensation
Plan, such percentage to be determined by reference to the Incentive Share Plan
in which the participant participates. Certain of the common shares received may
not be transferred for a period of five years from the date of issuance. The
Incentive Share Plan provides that, in the event of a Change in Control, (1)
each participant will receive a payment equal to the applicable percentage of
the Cash Bonus and (2) the transfer restrictions on common shares granted under
the Incentive Share Plan will lapse.
 
    Consummation of the merger will constitute a Change in Control under the
Incentive Share Plan. Accordingly, following consummation of the merger, the
Executives will receive approximately the following amounts: Mr. Sergel,
$157,493; Mr. Houston, $143,175; Mr. Jesanis, $54,429; Ms. LaFleur, $52,458; and
Mr. Kennedy, $42,411.
 
NEES GOALS PLAN
 
    Under the NEES Goals Plan (the "Goals Plan"), participants may earn annual
bonuses based upon the extent to which NEES achieves certain performance goals
determined annually and the employees' compensation. Within 30 days of the
consummation of a Change in Control, each participant in the Goals Plan is
entitled to receive a cash payment based upon the average award paid under the
Goals Plan for the 3 years preceding the Change in Control and the participant's
compensation for the previous 12 months. In addition, if the Change in Control
occurs prior to the determination and payment of the prior year's award, each
participant will receive an additional cash payment based upon the average award
paid under the Goals Plan for the three preceding years and the participant's
compensation in the prior year. Consummation of the merger will constitute a
Change in Control under the Goals Plan. Accordingly, following consummation of
the merger, the Executives will receive approximately the following amounts: Mr.
Sergel, $21,065; Mr. Houston, $19,150; Mr. Jesanis, $9,707; Ms. LaFleur, $9,355;
and Mr. Kennedy, $8,404.
 
EXECUTIVE SUPPLEMENTAL RETIREMENT PLAN; RETIREMENT SUPPLEMENTAL PLAN
 
    Under the terms of the Executive Supplemental Retirement Plan (the "SERP"),
each participant in the SERP is eligible to receive monthly payments of certain
amounts commencing upon retirement (the "Retirement Benefit"). Each
participant's Retirement Benefit is based upon his or her final average
compensation and years of service and is generally equal to the excess of (1)
the retirement benefit the participant would have received under NEES's
qualified pension plan without regard to limits imposed on such retirement
allowance by the Code (determined in certain cases without reduction for early
retirement) over (2) the actual retirement allowance the participant is entitled
to receive under NEES's qualified pension plan.
 
    Under the Retirement Supplemental Plan (the "RSP"), each Participant
receives an annual adjustment to his or her pension benefits. The amount of the
adjustment is equal to the rate of interest on AAA bonds for the prior year less
2%, but in no case more than the increase in the cost of living.
 
    At any time following a Change in Control or Major Transaction, a
participant whose employment has been terminated may elect to receive, in lieu
of any future benefits due under the SERP or the RSP, a cash payment equal to
90% of the actuarial value of such future benefits. Shareholder approval of the
merger agreement will constitute a Major Transaction and consummation of the
merger will constitute a Change in Control under the SERP and the RSP.
Accordingly, following shareholder approval of the merger, the Executives could
receive approximately the following amounts: Mr. Sergel,
 
                                       33
<PAGE>
$935,743; Mr. Houston, $3,651,491; Mr. Jesanis, $282,811; Ms. LaFleur, $289,337;
and Mr. Kennedy, $664,135; and director Bok could receive approximately
$4,629,038.
 
DIRECTORS RETIREMENT PLAN
 
    Pursuant to the Directors Retirement Plan, nonemployee directors who have
served on the NEES Board for 5 years or more or who terminate service after the
occurrence of a Change in Control or Major Transaction will receive a retirement
benefit upon the later of the director's retirement from the Board or age 60.
The benefit level is 100% of the annual cash retainer for directors who served
on the Board for 10 or more years or who terminate service following the
occurrence of a Change in Control or a Major Transaction and 75% of the annual
cash retainer for directors who served between 5 and 10 years and terminate
service prior to the occurrence of either a Change in Control or a Major
Transaction. There are no death benefits under the plan. Shareholder approval of
the merger will constitute a Major Transaction and consummation of the merger
will constitute a Change in Control under the Directors Retirement Plan.
 
DIRECTORS DEFERRED COMPENSATION PLAN
 
    Under the Directors Deferred Compensation Plan (the "Directors Deferral
Plan"), nonemployee directors are eligible to elect to defer receipt of a
portion of the director compensation that would otherwise be payable to them and
to elect the time and form of future payment of such amounts. At any time
following a Change in Control or Major Transaction, any participant in the
Directors Deferral Plan who has ceased to be a member of the Board may elect to
receive a cash payment equal to 90% of all amounts credited to such
participant's accounts thereunder and the actuarial value of certain insurance
benefits purchased under a prior version of the Directors Deferral Plan.
Shareholder approval of the merger will constitute a Major Transaction and
consummation of the merger will constitute a Change in Control under the
Directors Deferral Plan. Accordingly, following shareholder approval of the
merger agreement, NEES's nonemployee directors would be entitled to elect to
receive approximately the following amounts: Mr. Bulger, $104,587; Mr. Joskow,
$224,204; Mr. Ladd, $1,052,451; Mr. McClure, $225,333; Mr. Soule, $281,448, Ms.
Wexler, $558,636; Mr. Wilson, $13,306.
 
AGGREGATE BENEFITS PAYABLE TO OFFICERS AND DIRECTORS
 
    In summary, the total amounts described in the previous paragraphs of this
"Conflicts of Interest" section that certain Executives may be entitled to
receive, after consummation of the merger, but only under certain conditions,
including the loss of their jobs as a result of the merger, and assuming that
such person elects to receive all deferred compensation, are as follows: Mr.
Sergel, $8,527,883 ($5,757,813 of which he has agreed to waive, pursuant to the
employment agreement to be entered into among NEES, the National Grid Group and
Mr. Sergel on the effective date of the merger); Mr. Houston, $8,468,370; Mr.
Jesanis, $2,385,817; Ms. LaFleur, $2,458,051; and Mr. Kennedy, $2,252,169. Of
the aggregate amounts set forth in the prior sentence, the following amounts
represent compensation previously earned but deferred by such persons: Mr.
Sergel, $748,688; Mr. Houston, $1,066,842; Mr. Jesanis, $341,323; Ms. LaFleur,
$343,267; and Mr. Kennedy, $480,557. In addition, director Joan T. Bok may elect
to receive approximately $10,028,565, of which $5,399,527 is compensation
previously earned but deferred by her when she was an employee of NEES.
Furthermore, of the aggregate amounts set forth in the first sentence of this
paragraph, the following amounts will be payable to executives only if their
jobs are terminated: Mr. Sergel, $6,693,556 ($5,757,813 of which he has agreed
to waive, pursuant to the employment agreement to be entered into among NEES,
the National Grid Group and Mr. Sergel on the effective date of the merger); Mr.
Houston, $6,256,967; Mr. Jesanis, $1,565,209; Ms. LaFleur, $1,569,374; and Mr.
Kennedy, $1,400,195. Note that the only amounts to be received by directors,
other than Mrs. Bok (who may elect to receive amounts as described above), are
set forth under "Directors Deferred Compensation Plan" above.
 
                                       34
<PAGE>
                              THE MERGER AGREEMENT
 
    THE FOLLOWING IS A SUMMARY OF THE MATERIAL PROVISIONS OF THE MERGER
AGREEMENT. THE FOLLOWING SUMMARY DOES NOT PURPORT TO BE COMPLETE AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE MERGER AGREEMENT, WHICH IS
ATTACHED AS APPENDIX A TO THIS PROXY STATEMENT AND IS INCORPORATED IN THIS PROXY
STATEMENT BY REFERENCE. SHAREHOLDERS ARE URGED TO READ THE MERGER AGREEMENT IN
ITS ENTIRETY AND TO CONSIDER IT CAREFULLY. CAPITALIZED TERMS NOT OTHERWISE
DEFINED IN THIS PROXY STATEMENT OR IN THE FOLLOWING SUMMARY HAVE THE RESPECTIVE
MEANINGS SET FORTH IN THE MERGER AGREEMENT.
 
GENERAL
 
    In accordance with the merger agreement, if such agreement is approved by
the shareholders of NEES and the other conditions to the parties' respective
obligations to consummate the merger are satisfied, or where permissible,
waived, NGG Holdings will merge with and into NEES in accordance with the laws
of The Commonwealth of Massachusetts. NEES will be the Surviving Entity in the
merger, and the separate corporate existence of NGG Holdings will cease.
National Grid Group has informed NEES that as soon as possible following the
merger closing, National Grid Group intends to amend the NEES Agreement and
Declaration of Trust to permit a merger of NEES into a Massachusetts business
corporation. As soon as possible following such amendment, National Grid Group
intends to merge NEES with and into a newly-formed, wholly-owned subsidiary of
National Grid Group, which will be a Massachusetts business corporation. At that
time, the separate existence of NEES will cease.
 
MERGER CONSIDERATION
 
    As a result of the merger, each common share (other than (A) shares held by
NEES, as treasury stock, except for the Rabbi Trust Shares, (B) shares held by
any of NEES's subsidiaries and (C) shares owned by National Grid Group or any of
its subsidiaries, all of which in the case of (A), (B) and (C) will be cancelled
without consideration) will be cancelled and converted into the right to receive
a minimum of $53.75 per share in cash, without interest, payable upon surrender
of the certificate formerly evidencing such common share. In addition, as a
result of the merger, each Rabbi Trust share will be cancelled and converted
into the right to receive a minimum of $53.75 per share, without interest. The
cash payment for each such common share or Rabbi Trust Share will be subject to
an increase if completion of the merger does not take place within six months
after the NEES shareholders approve the merger. The amount of any such increase
will be determined using a daily accrual rate of $0.003288 per share until
closing, up to a maximum price of $54.35 per share.
 
EFFECTIVE TIME
 
    The merger shall become effective at the time of the filing of the
certificate of merger relating to the merger with the Secretary of The
Commonwealth of Massachusetts (the "Massachusetts Secretary"), or at such later
time as is specified in the certificate of merger. Subject to the provisions of
the merger agreement, on the closing date, a certificate of merger will be
executed and filed by NEES and NGG Holdings with the Massachusetts Secretary.
 
CONVERSION OF SHARES
 
    At the effective time of the merger, (1) each common share (other than (A)
shares held by NEES, as treasury stock, except for the Rabbi Trust Shares, (B)
shares held by any of NEES's subsidiaries and (C) shares owned by National Grid
Group or any of its subsidiaries, all of which in the case of (A), (B) and (C)
will be cancelled without consideration) and (2) each Rabbi Trust Share will be
cancelled and converted into the right to receive the Merger Consideration
payable upon surrender of the share certificate together with executed
transmittal forms. See "--Procedure for Payment." All such common
 
                                       35
<PAGE>
shares and Rabbi Trust Shares, when so converted, will no longer be outstanding
and will automatically be cancelled and retired and will cease to exist, and
each holder of a certificate representing any such shares will cease to have any
rights with respect to the common shares, except the right to receive the Merger
Consideration upon the surrender of the certificate together with executed
transmittal forms.
 
    All common shares that are held by NEES as treasury stock, other than the
Rabbi Trust Shares, and any common shares owned by National Grid Group or any
subsidiary of NEES or National Grid Group will be cancelled and retired and will
cease to exist and no Merger Consideration or other consideration will be
delivered in exchange for such shares.
 
PROCEDURE FOR PAYMENT
 
    See "The Annual Meeting--Exchange of Certificates."
 
    SHAREHOLDERS SHOULD NOT FORWARD CERTIFICATES TO THE PAYING AGENT UNTIL THEY
HAVE RECEIVED A LETTER OF TRANSMITTAL. SHAREHOLDERS SHOULD NOT RETURN
CERTIFICATES WITH THE ENCLOSED PROXY.
 
REPRESENTATIONS AND WARRANTIES
 
    NEES.  In the merger agreement, NEES has made representations and warranties
regarding, among other things, the following: (1) NEES's organization and
qualification to do business and similar corporate matters, (2) NEES's capital
shares and the capital stock of its subsidiaries, (3) NEES's authority to enter
into and perform its obligations under the merger agreement, (4) the absence of
conflict of the merger agreement and the transactions contemplated by the merger
agreement with the NEES Agreement and Declaration of Trust and the comparable
charter documents of NEES's subsidiaries, certain agreements and applicable law,
(5) certain regulatory consents and approvals required in connection with the
merger agreement and the transaction contemplated by the merger agreement, (6)
certain filings with the SEC and the financial statements contained in such
filings, and certain reports filed with state and federal regulatory agencies,
(7) absence of certain changes or events, (8) litigation involving NEES and its
subsidiaries, (9) information to be included or incorporated in this proxy
statement and in National Grid Group's circular to shareholders, (10) compliance
with laws, (11) tax matters, (12) employee benefit matters, (13) labor and
employee relations, (14) environmental matters, (15) regulation of NEES as a
utility under state and federal law, (16) NEES's insurance policies, (17)
interests of NEES's subsidiaries in nuclear facilities, (18) the vote required
by NEES's shareholders in connection with approval of the merger agreement and
the transactions contemplated by it, (19) the opinion of NEES's financial
advisor, Merrill Lynch, (20) no ownership by NEES of National Grid Group
ordinary shares, (21) state anti-takeover statutes do not apply to the merger,
(22) Year 2000 readiness, and (23) representations by certain of NEES's
affiliates.
 
    NATIONAL GRID GROUP.  In the merger agreement, National Grid Group and NGG
Holdings have made representations and warranties regarding, among other things,
the following: (1) National Grid Group's organization and qualification to do
business and similar corporate matters, (2) National Grid Group's capital stock
and the capital stock of its principal utility subsidiary, (3) National Grid
Group's authority to enter into and perform its obligations under the merger
agreement, (4) the absence of conflict of the merger agreement and the
transactions contemplated by the merger agreement with the memorandum and
articles of association of National Grid Group and the comparable charter
documents of NGG Holdings and National Grid Group's principal utility
subsidiary, certain agreements and applicable law, (5) certain regulatory
consents and approvals, (6) information to be included or incorporated in this
proxy statement and in National Grid Group's circular to shareholders, (7)
compliance with laws, (8) financing the Merger Consideration, (9) the vote
required by National Grid Group's shareholders in connection with approval of
the merger agreement and the transactions contemplated by it, and (10) no
ownership by National Grid Group of NEES common shares.
 
                                       36
<PAGE>
CONDUCT OF BUSINESS PENDING THE MERGER
 
    The merger agreement generally provides that, except as otherwise permitted
or required in the agreement or if the other party consents in writing, after
the date of the merger agreement and prior to the effective time of the merger:
 
1.  NEES and each of its subsidiaries will conduct their businesses in the
    ordinary course consistent with good utility practice, and use commercially
    reasonable efforts to preserve certain aspects of its business.
 
2.  NEES will not amend its Agreement and Declaration of Trust, and will not
    permit its subsidiaries to amend their comparable charter documents and
    by-laws.
 
3.  NEES will not, and will not let its subsidiaries, declare or pay any
    dividends or make other distributions in respect of its respective stock,
    except for (a) regular quarterly dividends, with usual record and payment
    dates, in amounts equal to or less than dividends paid in comparable periods
    in the prior fiscal year, (b) a special dividend in the quarter in which the
    effective time of the merger occurs with a record date on or prior to the
    effective time, that represents the pro rata portion of $0.59 per share
    "earned" during that quarter, and (c) dividends and distributions by NEES
    subsidiaries to the parent of such subsidiary.
 
4.  NEES will not, and will not permit its subsidiaries to, (a) split, combine,
    subdivide or reclassify any of their respective capital stock or issue
    shares of their respective capital stock, (b) adopt or authorize a
    liquidation, dissolution, merger, or other reorganization, or (c) redeem,
    repurchase or acquire shares of its capital stock or any option with respect
    to its capital stock, in each case with certain exceptions.
 
5.  NEES will not, and will not permit its subsidiaries to, issue, deliver or
    sell its capital stock or any option with respect to such capital stock with
    certain exceptions.
 
6.  NEES will not, and will not permit its subsidiaries to, acquire any
    business, corporation or other business organization other than in the
    ordinary course of its business consistent with past practice and having a
    value of less than $7.5 million for any one acquisition or $50 million in
    the aggregate through December 31, 1999, or $75 million in the aggregate if
    the merger occurs after December 31, 1999.
 
7.  NEES will not, and will not permit its subsidiaries to dispose of or
    encumber any of its assets or properties, other than dispositions in the
    ordinary course of its business consistent with past practice and having an
    aggregate value of less than $5 million for each disposition and $20 million
    in the aggregate.
 
8.  NEES will not, and will not permit its subsidiaries, to incur or guarantee
    debt or enter into any "keep well" or other agreement to maintain any
    financial condition of another person other than (a) short-term debt in the
    ordinary course of business consistent with past practice, with limitations
    on amount; (b) long-term debt in connection with the refinancing of existing
    debt at its stated maturity or at a lower cost of funds; or (c) guarantees
    or "keep well" agreements in favor of wholly-owned subsidiaries of NEES, in
    connection with such subsidiaries' businesses, not aggregating more than $15
    million.
 
9.  Except (A) as required by law or (B) as deemed necessary by NEES, after
    consulting with National Grid Group, following a catastrophic event such as
    a major storm, NEES and its subsidiaries may not make any capital
    expenditures or commitments during any fiscal year in excess of certain
    agreed upon amounts.
 
10. NEES will not, and will not permit its subsidiaries, to enter into, adopt,
    materially amend or terminate any of NEES's employee benefit plans. Except
    for normal increases in the ordinary
 
                                       37
<PAGE>
    course of business, NEES and its subsidiaries have limitations on the
    compensation and benefits each may pay.
 
11. NEES will not, and will not permit its subsidiaries, to pay, discharge or
    satisfy any material claims, liabilities or obligations other than
    liabilities that were reflected in the most recent audited financial
    statements filed with the SEC prior to the date of the merger agreement that
    are to be discharged in the ordinary course in accordance with their terms
    or incurred in the ordinary course of business consistent with past
    practice.
 
12. Other than in the ordinary course of business consistent with past practice,
    NEES will not, and will not permit its subsidiaries, to (A) modify, amend,
    terminate or fail to use commercially reasonable efforts to renew any
    material contract of NEES or its subsidiaries, (B) release or assign any
    material rights or claims under such contracts, or (C) enter into any new
    material contracts, unless expressly permitted by the merger agreement.
 
13. NEES and its subsidiaries will maintain with financially responsible
    insurance companies (or through self-insurance, consistent with past
    practice) insurance in such amounts and against such risks and losses as are
    customary for companies engaged in their respective businesses.
 
14. NEES will not, and will not permit its subsidiaries, to engage in any
    activities which would cause a change in its status, or that of its
    subsidiaries, under the 1935 Act.
 
15. With certain exceptions, NEES will consult with National Grid Group prior to
    implementing any changes in its or any of its subsidiaries' rates or
    charges, standards of service or accounting or executing any agreement with
    respect thereto and will not make any related filings except in the ordinary
    course of business consistent with past practice or as required by an
    appropriate governmental or regulatory body.
 
16. NEES will not, and will not permit its subsidiaries to, make any changes in
    accounting methods, policies or procedures, except as required by law or
    applicable generally accepted accounting principles.
 
17. NEES will not, and will not permit its subsidiaries, to (a) make or rescind
    any material election relating to taxes, (b) make a request for a tax ruling
    or enter into an agreement with a taxing authority, (c) settle or compromise
    any material claim, action, or audit relating to taxes, or (d) materially
    change its methods of reporting income, deductions or accounting for federal
    income tax purposes from those in its December 31, 1997 federal income tax
    return, except as may be required by applicable law.
 
18. NEES will confer with National Grid Group on a regular and frequent basis
    with respect to NEES's business and operations and other matters relevant to
    the merger, to the extent permitted by law.
 
19. NEES will notify National Grid Group of any material event with respect to
    its operations or the merger. NEES and its subsidiaries will not willfully
    take or fail to take any action that causes or likely may cause a breach of
    its covenants or agreements under the merger agreement, or that would
    materially render untrue any of its representations or warranties in the
    merger agreement. NEES and its subsidiaries will also try to cure any such
    breach as soon as practical after it learns of such breach.
 
20. Neither NEES nor its subsidiaries will terminate, amend, modify or waive any
    provision of any confidentiality or standstill agreement to which it is a
    party, and will enforce the provisions of any such agreement.
 
21. National Grid Group and its subsidiaries will not acquire or agree to
    acquire any business, corporation or other business organization or division
    thereof or assets thereof, if the entering into of
 
                                       38
<PAGE>
    such an agreement could reasonably be expected to (a) impose any material
    delay in the obtaining of, or significantly increase the risk of not
    obtaining, any consents or approvals of any governmental authority necessary
    to consummate the merger, (b) significantly increase the risk of any
    governmental authority entering an order prohibiting the consummation of the
    merger, or the risk of not being able to remove any such order on appeal or
    otherwise, or (c) materially delay the consummation of the merger.
 
22. National Grid Group will notify NEES of any material event with respect to
    its operations or the merger. National Grid Group and its subsidiaries will
    not willfully take or fail to take any action that would or is reasonably
    likely to result in (A) a material breach of any of its covenants or
    agreements contained in the merger agreement or (B) certain of its
    representations and warranties in the merger agreement being untrue in any
    material respect on and as of the closing date. National Grid Group and its
    subsidiaries will also try to cure any such breach as soon as practical
    after it learns of such breach.
 
23. NEES and National Grid Group will, subject to limitations imposed by
    applicable law, create a special integration steering team to deal with
    certain matters pending the consummation of the merger.
 
DIRECTORS' AND OFFICERS' INSURANCE AND INDEMNIFICATION
 
    Directors, officers and presently covered current or former employees of
NEES will be indemnified to the fullest extent permitted by applicable law
against any claim arising prior to the merger relating to (1) the fact that such
person is or was a director, officer or employee of NEES or any of its
subsidiaries and (2) the merger agreement or the transactions contemplated by
the merger agreement. For a period of six years following the merger, National
Grid Group and the Surviving Entity shall, at National Grid Group's election:
(1) cause to be maintained an extended reporting period for NEES's current D&O
liability insurance on terms no less favorable than the terms of such current
coverage or (2) provide tail coverage for six years for acts prior to the
effective time of the merger on terms no less favorable than the terms of such
current insurance coverage.
 
EMPLOYEE MATTERS
 
    All employees of NEES's subsidiaries immediately prior to Closing will
become employees of corresponding subsidiaries of the Surviving Entity
immediately following Closing. For twelve months after Closing, National Grid
Group will provide compensation and benefits not less favorable in the aggregate
than those given to NEES employees immediately prior to the closing date.
Affected employees will get full credit for eligibility, vesting, benefit
accrual and determination of level of benefits under NEES's employee benefits
plans, provided that with respect to any benefit plans established after the
closing date, service will be credited in accordance with such plans. National
Grid Group will, or will cause the Surviving Entity to, honor, and National Grid
Group will guarantee, the employment, severance, retention and consulting
agreements in effect as of the date of the merger agreement or that are entered
into in accordance with the merger agreement prior to the Closing Date, in each
case in accordance with their terms.
 
    During the period between execution of the merger agreement and the closing
date NEES may negotiate successor collective bargaining agreements. NEES will
keep National Grid Group informed as to, and will consult with National Grid
Group as to the strategy for all negotiations with collective bargaining
representatives.
 
                                       39
<PAGE>
NO SOLICITATION OF PROPOSALS
 
    Neither NEES nor its subsidiaries will knowingly initiate, solicit or
encourage, directly or indirectly, any inquiry or proposal or offer, or engage
in negotiations with, or provide confidential information to any third party
relating to a business combination proposal. NEES will notify National Grid
Group of any such inquiries relating to a business combination proposal.
However, prior to NEES shareholder approval, NEES may furnish information and
conduct discussion and negotiations with respect to such a proposal if:
 
1.  NEES's Board determines, in good faith based upon the advice of its outside
    legal counsel with respect to the Board's fiduciary duties, that taking such
    action is necessary for the Board to act in a manner consistent with its
    fiduciary duties under applicable law;
 
2.  NEES's Board reasonably concludes, in good faith after consultation with its
    financial advisors, that the party making such proposal (A) has adequate
    financing sources and (B) such proposal is likely to be more favorable to
    shareholders of NEES than the merger with National Grid Group (a "Superior
    Proposal");
 
3.  prior to furnishing nonpublic information or entering into negotiations,
    NEES notifies National Grid Group in writing of such furnishing of
    information or negotiations (identifying the party making the proposal and
    the material terms of such proposal) and enters into a confidentiality
    agreement with such third party; and
 
4.  NEES keeps National Grid Group promptly informed of the status and all
    material information with respect to such discussions or negotiations.
 
    NEES may have to pay a termination fee to National Grid Group if it accepts
an alternative proposal under certain circumstances. See "--Termination Fees"
section below.
 
CONDITIONS TO CONSUMMATION OF THE MERGER
 
    The respective obligation of each party to effect the merger is subject to:
 
1.  the receipt of approvals of NEES shareholders and National Grid Group
    shareholders;
 
2.  expiration or termination of any waiting period under Hart-Scott-Rodino and
    the termination of any review and investigation under Exon-Florio;
 
3.  absence of any injunction, order or law, preventing the consummation of the
    merger; and
 
4.  receipt by National Grid Group and NEES of the required statutory approvals,
    which shall have become "Final Orders" (meaning that such order has not been
    reversed or set aside, all periods for waiting or rehearing have expired,
    and all conditions to such order's effectiveness have been satisfied) and
    such Final Orders do not impose conditions that would have a materially
    adverse impact on NEES, National Grid Group or the consummation of the
    merger.
 
    The obligation of National Grid Group and NGG Holdings to effect the merger
is further subject to:
 
1.  the accuracy of NEES's representations and warranties;
 
2.  the performance by NEES of its obligations;
 
3.  no material adverse effect on NEES shall have occurred; and
 
4.  receipt by NEES of all required consents.
 
                                       40
<PAGE>
    The obligation of NEES to effect the merger is further subject to:
 
1.  the accuracy of certain representations and warranties made by National Grid
    Group and NGG Holdings;
 
2.  receipt by National Grid Group of all required consents; and
 
3.  the performance by National Grid Group of its obligations.
 
TERMINATION
 
    The merger agreement may be terminated:
 
1.  by mutual written agreement of the boards of directors of NEES and National
    Grid Group;
 
2.  by NEES or National Grid Group if the merger has not been consummated by the
    date nine months from the receipt of NEES shareholder approval (the "Initial
    Termination Date"), PROVIDED that if the parties are otherwise ready to
    close, but certain statutory approvals are not yet obtained, the Initial
    Termination date will be extended to the date fifteen months from the
    receipt of NEES shareholder' approval (the "Extended Termination Date"), and
    PROVIDED FURTHER that if on the Initial or Extended Termination Date, a
    "Financial Disruption" exists, then NEES will have the right, but not the
    obligation, to extend such Termination Date six months beyond such
    Termination Date. A "Financial Disruption" means any significant disruption
    in the financial or capital markets which makes it impracticable for a
    company having financial characteristics similar to those of National Grid
    Group to finance a transaction of the size and nature as that contemplated
    under the merger agreement on commercially reasonable financing terms that
    are available as of the date of such financing;
 
3.  by either NEES or National Grid Group if: (a) NEES shareholder approval or
    National Grid Group shareholder approval is not obtained at a duly called
    meeting; or (b) any law, rule or regulation is adopted which makes the
    merger illegal or any final order or injunction permanently prohibits the
    merger;
 
4.  by NEES if it becomes the target of a third party alternative proposal, and
    NEES's Board determines in good faith based upon the advice of outside
    counsel with respect to the Board's fiduciary duties, that termination is
    necessary for the Board to act consistently with its fiduciary duties under
    applicable law; provided, however, that prior to any termination, (a) the
    Board must determine, based on advice of counsel with respect to the Board's
    fiduciary duties, that notwithstanding a binding commitment to consummate
    the merger agreement and notwithstanding all concessions that may be offered
    by National Grid Group in further negotiations with NEES, it is necessary
    for the Board to reconsider its commitment to the merger with National Grid
    Group and (b) NEES must negotiate with National Grid Group to adjust the
    merger agreement so as to enable the parties to proceed with an adjusted
    merger agreement, PROVIDED that in the event of any such termination, NEES
    pays the required termination fee to National Grid Group at the time it
    terminates the merger agreement (see "--Termination Fees" section below);
 
5.  by NEES if National Grid Group materially breaches its representations and
    warranties or fails to perform and comply with its covenants under the
    merger agreement and such breach or failure has not been cured;
 
6.  by NEES if National Grid Group fails to deliver the Merger Consideration at
    a time when all conditions to National Grid Group's obligation to close have
    been satisfied or waived;
 
7.  by NEES if the board of directors of National Grid Group withdraws or
    modifies its approval of the merger or its recommendation to its
    shareholders;
 
                                       41
<PAGE>
8.  by National Grid Group if the Board of NEES approves, recommends or takes no
    position with respect to an alternative proposal;
 
9.  by National Grid Group if, twelve months after NEES shareholders' approval
    is obtained, the order of the SEC approving the merger under the 1935 Act
    has not been issued, and National Grid Group certifies to NEES that it
    reasonably believes that the SEC will not issue an order on or prior to the
    Extended Termination Date;
 
10. by National Grid Group if the Board of NEES withdraws or modifies its
    approval of the merger or its recommendation to its shareholders; or
 
11. by National Grid Group if there has been a material breach of NEES's
    representations and warranties or a failure to perform and comply with its
    covenants under the merger agreement and such breach or failure has not been
    cured.
 
TERMINATION FEES
 
    If the Agreement is terminated because either party's Board has withdrawn or
changed its recommendation with respect to the merger PRIOR to such party's
shareholder meeting, then the other party must pay a $100 million termination
fee plus documented out-of-pocket expenses up to $10 million.
 
    NEES will pay National Grid Group a termination fee of $100 million plus up
to $10 million for documented out-of-pocket expenses if NEES terminates the
merger agreement because NEES became the target of a third party alternative
proposal, and NEES's Board determined in good faith based upon the advice of
outside counsel with respect to the Board's fiduciary duties, that termination
was necessary for the Board to act consistently with its fiduciary duties under
applicable law, as described in more detail under "--Termination" above.
 
    NEES will pay National Grid Group a termination fee of $100 million plus up
to $10 million for documented out-of-pocket expenses if, at a time when a third
party alternative proposal is pending, National Grid Group terminates the merger
agreement because: (1) NEES has materially breached its representations and
warranties or has failed to materially perform and comply with its covenants
under the merger agreement, or (2) NEES shareholder approval was not obtained,
but only if, in either case, NEES enters into a merger or acquisition agreement
with the party offering such alternative proposal within two years of such
termination.
 
    NEES will pay National Grid Group a termination fee of $100 million plus up
to $10 million for out-of-pocket expenses if, at a time when a third party
alternative proposal is pending, NEES terminates the merger agreement because
the Closing has not occurred by the termination date, but only if NEES enters
into a merger or acquisition agreement with the party offering such alternative
proposal within two years of such termination.
 
    National Grid Group will pay NEES a termination fee of $100 million if NEES
terminates the merger agreement because National Grid Group was unable to pay
the Merger Consideration, at a time when all of the National Grid Group's
closing conditions were met or waived, because of a Financial Disruption.
 
    National Grid Group will pay NEES a termination fee of $75 million plus up
to $10 million for documented out-of-pocket expenses if National Grid Group
terminates after the twelve month anniversary of NEES's shareholder approval
because an order from the SEC approving the merger pursuant to the 1935 Act has
not been issued, and National Grid Group reasonably believes that the SEC will
not issue an order on or before the Extended Termination Date.
 
    NEES will pay National Grid Group for documented out-of-pocket expenses up
to $10 million if National Grid Group terminates at a time when no third party
alternative proposal was outstanding
 
                                       42
<PAGE>
because of NEES's (1) material breach of its representations and warranties, (2)
failure to perform and comply with its covenants under the merger agreement or
(3) failure to obtain its shareholder vote.
 
    National Grid Group will pay NEES for documented out-of-pocket expenses up
to $10 million if NEES terminates because of National Grid Group's (1) material
breach of its representations and warranties, (2) failure to perform and comply
with its covenants under the merger agreement or (3) failure to obtain its
shareholder vote.
 
MISCELLANEOUS
 
    NATIONAL GRID GROUP BOARD OF DIRECTORS  At the effective time of the merger,
National Grid Group will appoint Richard P. Sergel, NEES's president and chief
executive officer, and one additional NEES director to National Grid Group's
board of directors.
 
    POST MERGER OPERATIONS  At the effective time of the merger, the
headquarters of the Surviving Entity will be located in Massachusetts and
offices for the Surviving Entity's utility operations in New England will be
located in The Commonwealth of Massachusetts and the States of New Hampshire and
Rhode Island, consistent with the current operations of NEES.
 
    SURVIVING ENTITY BOARD OF DIRECTORS  After the effective time of the merger,
the initial board of directors of the Surviving Entity will have up to nine
members designated from among the officers of National Grid Group and the
Surviving Entity, as mutually agreed by National Grid Group and NEES.
 
    ADVISORY BOARD  After the effective time of the merger, National Grid Group
will establish and maintain for a period of two years an advisory board
comprised of up to 11 persons who were, immediately prior to the effective time
of the merger, serving as non-executive members of NEES's Board and who are
willing to serve in such capacity on the Advisory Board. The function of the
advisory board will be to advise the Surviving Entity's Board of Directors with
respect to general business as well as opportunities and activities in the
Surviving Entity's market area and to maintain and develop customer
relationships.
 
                                 THE COMPANIES
 
NEW ENGLAND ELECTRIC SYSTEM
 
    NEES is a Massachusetts business trust and a public utility holding company.
The principal subsidiaries of NEES include New England Power Company, which is
engaged in the transmission and generation of electricity, and four electricity
delivery companies:
 
    - Massachusetts Electric Company
 
    - The Narragansett Electric Company
 
    - Granite State Electric Company
 
    - Nantucket Electric Company.
 
    NEES also controls a number of subsidiaries engaged in various
energy-related businesses, and also, through a subsidiary, has equity
investments or joint ownership interests in various power plants throughout New
England. New England Power Service Company, another subsidiary of NEES, provides
support services for NEES affiliates. The states in which NEES's subsidiaries
serve retail customers are: Massachusetts, Rhode Island and New Hampshire. The
principal executive offices of NEES are located in Westborough, Massachusetts.
 
                                       43
<PAGE>
NATIONAL GRID GROUP AND NGG HOLDINGS
 
    National Grid Group is a public limited company incorporated under the laws
of England and Wales with registration number 2367004. National Grid Group
through its principal subsidiary, The National Grid Company plc, owns, operates
and maintains the high voltage electricity transmission system in England and
Wales, which connects generators with major customers and regional electricity
companies. National Grid Group also owns and operates interconnectors which
enable electricity to be transferred between the England and Wales market and
Scotland and France. National Grid Group is listed on the London Stock Exchange
and has a sponsored ADR program on the NYSE.
 
    In England and Wales, National Grid Group is subject to regulatory controls
on the prices it may charge for services which generate the majority of its
revenues. The current transmission price control arrangements came into effect
on April 1, 1997 and are expected to remain in force until March 31, 2001.
 
    National Grid Group has a major shareholding in an associated company,
Energis plc. Energis operates a telecommunications network in the United Kingdom
and provides a range of telecommunications services. On January 19, 1999,
National Grid Group announced a proposed securities offering relating to Energis
which, upon completion, will result in National Grid Group having voting rights
over less than 50 percent of the total amount of outstanding Energis shares.
 
    As the liberalization of international electricity industries continues,
National Grid Group has sought investment opportunities overseas where it can
utilize its existing assets, skills and resources to improve returns for
shareholders. National Grid Group, with partners, is involved in the ownership
and operation of transmission systems in Argentina and Zambia.
 
    The principal executive offices of National Grid Group are located in
Coventry, United Kingdom.
 
    NGG Holdings is a Massachusetts limited liability company which is 0.01%
directly owned by National Grid Group, and 99.99% owned by a subsidiary of
National Grid Group. NGG Holdings was recently formed solely for purposes of the
merger. NGG Holdings has not conducted any business except in connection with
the merger. The principal executive offices of NGG Holdings are located in
Boston, Massachusetts.
 
     SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF NEES
 
    The table on page 52 in "Share Ownership" shows, as of January 20,1999, all
of the common shares owned beneficially by (1) each person who is or was a
director of NEES, (2) NEES's chief executive officer, Mr. Sergel, (3) NEES's
former chief executive officer, Mr. Rowe, and (4) NEES's four most highly
compensated executive officers other than Mr. Sergel, who were serving as
executive officers as of the end of the last fiscal year.
 
              MARKET PRICES OF AND DIVIDENDS ON NEES COMMON SHARES
 
    The common shares are listed on the NYSE under the ticker symbol "NES".
 
    On December 11, 1998, the last day of trading of the common shares prior to
the announcement of the execution of the merger agreement, the high, low and
closing sales prices of the common shares as quoted on the NYSE were $43.00,
$42.00 and $43.00, respectively.
 
                                       44
<PAGE>
    The following table indicates the high and low sales prices and dividends
for the common shares for the first quarter of 1996 through March 18, 1999:
<TABLE>
<CAPTION>
                                                                                         HIGH                   LOW
                                                                                       --------               --------
<S>                                                                             <C>          <C>        <C>        <C>
Year Ended December 31, 1999
  January 1 through March 18, 1999............................................          49   5/8               47  3/4
 
Year Ended December 31, 1998
  4(th) Quarter...............................................................   $      49   1/8        $      40  5/16
  3(rd) Quarter...............................................................          43   5/8               38  15/16
  2(nd) Quarter...............................................................          45   9/16              40  5/8
  1(st) Quarter...............................................................          45   13/16             41
 
Year Ended December 31, 1997
  4(th) Quarter...............................................................   $      43   5/16       $      37  1/4
  3(rd) Quarter...............................................................          39   11/16             36  1/4
  2(nd) Quarter...............................................................          37   1/8               33  1/4
  1(st) Quarter...............................................................          35   5/8               33  3/8
 
Year Ended December 31, 1996
  4(th) Quarter...............................................................   $      35   5/8        $      31
  3(rd) Quarter...............................................................          36   3/8               31  1/8
  2(nd) Quarter...............................................................          38   7/8               32  7/8
  1(st) Quarter...............................................................          40   5/8               36  1/8
 
<CAPTION>
                                                                                 DIVIDEND PAID
                                                                                ---------------
<S>                                                                             <C>
Year Ended December 31, 1999
  January 1 through March 18, 1999............................................     $    0.59
Year Ended December 31, 1998
  4(th) Quarter...............................................................     $    0.59
  3(rd) Quarter...............................................................          0.59
  2(nd) Quarter...............................................................          0.59
  1(st) Quarter...............................................................          0.59
Year Ended December 31, 1997
  4(th) Quarter...............................................................     $    0.59
  3(rd) Quarter...............................................................          0.59
  2(nd) Quarter...............................................................          0.59
  1(st) Quarter...............................................................          0.59
Year Ended December 31, 1996
  4(th) Quarter...............................................................     $    0.59
  3(rd) Quarter...............................................................          0.59
  2(nd) Quarter...............................................................          0.59
  1(st) Quarter...............................................................          0.59
</TABLE>
 
                                       45
<PAGE>
                            SELECTED FINANCIAL DATA
 
SELECTED CONSOLIDATED FINANCIAL DATA
 
    The following table sets forth selected consolidated financial data of NEES
and its subsidiaries for each of the five fiscal years ended December 31, 1994
through 1998. NEES's financial statements for the years ended December 31, 1994
through 1997 were audited by Coopers & Lybrand L.L.P. (now known as
PriceWaterhouseCoopers LLP following a merger with Price Waterhouse LLP),
independent public accountants. NEES's financial statements for the year ended
December 31 1998 were audited by PriceWaterhouseCoopers LLP, independent public
accountants.
 
    The selected financial data set forth below does not purport to be complete
and should be read in conjunction with, and are qualified in their entirety by,
NEES's annual reports, including the notes thereto, to which the reader should
refer and may obtain from NEES or the SEC.
 
<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31,
                                             --------------------------------------------------------------------
                                                 1998          1997          1996          1995          1994
                                             ------------  ------------  ------------  ------------  ------------
<S>                                          <C>           <C>           <C>           <C>           <C>
                                                       (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
SELECTED INCOME STATEMENT DATA
Operating Revenue..........................  $  2,420,533  $  2,502,591  $  2,350,698  $  2,271,712  $  2,243,029
Operating Income...........................  $    316,626  $    366,861  $    348,118  $    323,428  $    296,496
Net Income:
  Continuing Operations....................  $    190,042  $    220,038  $    208,936  $    204,757  $    199,426
 
Earnings per Diluted Average Common Share
  Outstanding:
  Continuing Operations....................  $       3.04  $       3.39  $       3.22  $       3.15  $       3.07
 
Cash Dividends Declared Per Common Share...  $       2.36  $       2.36  $       2.36  $      2.345  $      2.285
 
SELECTED BALANCE SHEET DATA
Total Assets...............................  $  5,081,959  $  5,311,647  $  5,223,251  $  5,190,876  $  5,084,841
Total Long-Term Debt.......................  $  1,054,912  $  1,487,481  $  1,614,578  $  1,675,170  $  1,520,488
Common Share Equity........................  $  1,572,131  $  1,744,442  $  1,685,417  $  1,631,779  $  1,580,838
Book Value Per Share.......................  $      26.53  $      27.03  $      25.98  $      25.13  $      24.33
</TABLE>
 
                                       46
<PAGE>
                       PROPOSAL 3--ELECTION OF DIRECTORS
 
    The Board of Directors recommends a vote "FOR" the individuals nominated as
directors in this proposal.
 
    The persons named on the accompanying proxy will vote, unless otherwise
directed, for the election of the thirteen nominees listed below as directors of
NEES. All of the elected directors will hold office until the earlier of (1) the
effective time of the merger, (2) the next annual meeting of shareholders or (3)
the special meeting held in lieu thereof and until their respective successors
are chosen and qualified.
 
    All of the nominees for election as directors were elected by the
shareholders at the 1998 Annual Meeting.
 
    NEES knows of no reason why any of the nominees would be unable to act as a
director, but, if any of them should become unavailable to serve, the persons
named on the accompanying proxy have the authority to vote for any other person
nominated and recommended by the Corporate Governance Committee. If an
alternative nominee is not recommended by the Corporate Governance Committee,
the number of directors will be reduced.
 
    Certain information regarding each nominee for director is given below. This
information has been furnished to NEES by the respective nominees.
 
Joan T. Bok                                                  Director since 1979
 
    CHAIRMAN EMERITUS.  Mrs. Bok, 69 years of age, was elected Chairman in 1984
and held that position through 1993. She was elected Chairman of the Board in
1993 and held that position until 1998 when she retired as Chairman of the Board
and was elected Chairman Emeritus. From July 1988 until February 1989, she also
served as President and Chief Executive Officer. Until 1997, Mrs. Bok served as
a director of each of NEES's direct subsidiaries, including Massachusetts
Electric Company, The Narragansett Electric Company, and New England Power
Company. Mrs. Bok is a director of Avery Dennison Corporation, John Hancock
Mutual Life Insurance Company, and Solutia, Inc., and is a Trustee of the Boston
Athenaeum and the Urban Institute.
 
William M. Bulger                                            Director since 1996
 
    PRESIDENT OF THE UNIVERSITY OF MASSACHUSETTS, BOSTON, MASSACHUSETTS.  Mr.
Bulger, 65 years of age, served as President of the Massachusetts State Senate
from July 1978 to January 1996. He also serves as a director of Citizens Bank
and is a Trustee of Massachusetts General Hospital, the Boston Public Library,
and the Museum of Fine Arts. He is a corporator of the Children's Museum and the
Winsor School and is on the board of overseers of the Boston Symphony Orchestra.
 
Alfred D. Houston                                            Director since 1998
 
    CHAIRMAN.  Mr. Houston, 58 years of age, was elected Chairman in 1998. He
served as Executive Vice President of NEES from 1994 to 1998 and as Chief
Financial Officer from 1984 to 1998. He was Senior Vice President from 1987 to
1994. He is an officer or director of a number of NEES's subsidiaries, including
New England Power Company. Mr. Houston is a director of Arkwright Mutual
Insurance Co. and the Massachusetts Business Roundtable and a Trustee of the
Boston Ballet, Nichols College, and the Massachusetts Taxpayers Foundation.
 
Paul L. Joskow                                               Director since 1987
 
    PROFESSOR OF ECONOMICS AND MANAGEMENT, DEPARTMENT OF ECONOMICS,
MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS.  Professor
Joskow, 51 years of age, teaches and conducts research in the fields of
industrial organization, government regulation, antitrust law and economics, and
energy
 
                                       47
<PAGE>
economics. He served as Chairman of the Economics Department from 1994 to 1998.
Professor Joskow is a director of State Farm Indemnity Company and a Trustee of
the Putnam Mutual Funds. He is also a director of the Whitehead Institute for
Biomedical Research and President of the Yale University Council.
 
John M. Kucharski                                            Director since 1989
 
    CHAIRMAN OF THE BOARD OF EG&G, INC., WELLESLEY, MASSACHUSETTS.  Mr.
Kucharski, 63 years of age, served as Chief Executive Officer of EG&G, Inc. from
1987 through 1998. He is a director of State Street Boston Corporation and
Nashua Corporation. He also serves as Trustee of George Washington University
and Marquette University.
 
Edward H. Ladd                                               Director since 1974
 
    CHAIRMAN OF STANDISH, AYER & WOOD, INC. (INVESTMENT COUNSELORS), BOSTON,
MASSACHUSETTS. Mr. Ladd, 61 years of age, is a director of Harvard Management
Company and Greylock Management Company. He is also a Trustee of Wheelock
College and an Overseer of Beth Israel Deaconess Hospital.
 
Joshua A. McClure                                            Director since 1978
 
    FORMER PRESIDENT OF AMERICAN CUSTOM KITCHENS, INC., PROVIDENCE, RHODE
ISLAND.  Mr. McClure, 67 years of age, is a director of the Westerly Pawcatuck
YMCA and the North End Crime Watch and Community Development Corporation. He is
also a member of the Building Committee of the Westerly Senior Center, and a
director of the Washington County Housing Authority.
 
George M. Sage                                               Director since 1975
 
    PRESIDENT AND TREASURER OF BONANZA BUS LINES, INC., PROVIDENCE, RHODE
ISLAND.  Mr. Sage, 67 years of age, is a director of Collette Travel, Inc. and
the American Bus Association. Mr. Sage also serves as a director of United Way
of Southeastern New England and is a director and member of the Executive
Committee of Business Development of Rhode Island. He is also a Trustee of St.
Andrew's School.
 
Richard P. Sergel                                            Director since 1998
 
    PRESIDENT AND CHIEF EXECUTIVE OFFICER.  Mr. Sergel, 49 years of age, was
elected President and Chief Executive Officer of NEES in February, 1998. From
1996 to 1998, he served as Senior Vice President and from 1992 to 1995, he
served as Vice President of NEES. He is a director of a number of NEES's
subsidiaries, including Massachusetts Electric Company, The Narragansett
Electric Company, and New England Power Company. Mr. Sergel is a Trustee for the
Consortium for Energy Efficiency and a director of United Way of Merrimack
Valley and the Lowell Plan.
 
Charles E. Soule                                             Director since 1994
 
    RETIRED PRESIDENT AND CHIEF EXECUTIVE OFFICER OF PAUL REVERE INSURANCE
GROUP, WORCESTER, MASSACHUSETTS.  Mr. Soule, 64 years of age, retired as
President and Chief Executive Officer of Paul Revere Insurance Group, a
subsidiary of Textron, Inc. in 1997, a position he held since 1990. Mr. Soule is
Executive in Residence at The American College. Mr. Soule also serves as a
Trustee for the Westboro Savings Bank and a director of Carroll Enterprises. He
was a member of the Massachusetts Electric Company Board of Directors from 1991
to 1993.
 
Anne Wexler                                                  Director since 1981
 
    CHAIRMAN OF THE WEXLER GROUP (MANAGEMENT CONSULTANTS), WASHINGTON, D.C.  The
Wexler Group is a subsidiary of Hill and Knowlton. Ms. Wexler, 69 years of age,
served as Assistant to the President of the United States from 1978 to 1981 with
responsibility for liaison with the business community and
 
                                       48
<PAGE>
other major interest groups. She is a director of Comcast Corporation, Dreyfus
Index Funds, Dreyfus Mutual Funds, and Wilshire Target Funds Inc.
 
James Q. Wilson                                              Director since 1982
 
    PROFESSOR EMERITUS OF MANAGEMENT AT THE UNIVERSITY OF CALIFORNIA AT LOS
ANGELES, LOS ANGELES, CALIFORNIA.  Professor Wilson is 67 years of age. He is a
director of State Farm Insurance Company and Protection One, Inc. and a Trustee
of the American Enterprise Institute, the RAND Corporation, and the Randolph
Foundation.
 
James R. Winoker                                             Director since 1991
 
    CHIEF EXECUTIVE OFFICER OF BELVOIR PROPERTIES, INC. (REAL ESTATE
INVESTMENT), PROVIDENCE, RHODE ISLAND. Mr. Winoker, 67 years of age, has served
as Chief Executive Officer of Belvoir Properties, Inc. since 1994. He was
Treasurer of Belvoir Properties, Inc. from 1980 to 1994 and President of B.B.
Greenberg Co. (jewelry manufacturers) from 1970 to 1994. A receiver was
appointed for B.B. Greenberg Co. in 1994. Mr. Winoker is also a director of
Original Bradford Soap Works, Inc.
 
                        BOARD STRUCTURE AND COMPENSATION
 
    NEES has an Executive Committee, an Audit Committee, a Compensation
Committee, a Corporate Governance Committee, and a Corporate Responsibility
Committee.
 
EXECUTIVE COMMITTEE
 
    - Mrs. Bok
 
    - Mr. Houston
 
    - Mr. Joskow
 
    - Mr. Ladd
 
    - Mr. Sage
 
    - Mr. Sergel
 
    - Ms. Wexler
 
    Mr. Ladd serves as the Chairman of this Committee.
 
    During the intervals between meetings of the Board of Directors, the
Executive Committee has all the powers of the Board that may be delegated.
 
AUDIT COMMITTEE
 
    - Mr. Bulger
 
    - Mr. Joskow
 
    - Mr. Soule
 
    - Mr. Winoker
 
    Mr. Joskow serves as the Chairman of this Committee.
 
    The Audit Committee reviews with the independent public accountants the
scope of their audit and management's financial stewardship for the current and
prior years. This Committee also recommends to the Board of Directors the
independent public accountants to be engaged for the coming year.
 
COMPENSATION COMMITTEE
 
    - Mr. Kucharski
 
                                       49
<PAGE>
    - Mr. Sage
 
    - Ms. Wexler
 
    Mr. Sage serves as the Chairman of this Committee.
 
    The Compensation Committee is responsible for executive compensation,
including the administration of certain of NEES's incentive compensation plans.
 
CORPORATE GOVERNANCE COMMITTEE
 
    - Mr. Joskow
 
    - Mr. Ladd
 
    - Mr. Sage
 
    - Ms. Wexler
 
    Mr. Ladd serves as Chairman of this Committee.
 
    The Corporate Governance Committee is responsible for maintaining the
quality and experience of the Board. As part of its responsibilities, the
committee also functions as a nominating committee and considers and evaluates
director candidates, determines criteria and procedures for selecting
non-management directors, and conducts periodic reviews of director performance.
This Committee also considers written recommendations from shareholders for
nominees to the Board.
 
CORPORATE RESPONSIBILITY COMMITTEE
 
    - Mrs. Bok
 
    - Mr. Houston
 
    - Mr. McClure
 
    - Mr. Sergel
 
    - Mr. Wilson
 
    - Mr. Winoker
 
    Mr. Wilson serves as the Chairman of this Committee.
 
    The Corporate Responsibility Committee reviews compliance with laws and
regulations, offers guidance in considering public policy issues, and helps to
assure ethical conduct.
 
DIRECTOR COMPENSATION
 
    Members of the Board of Directors, except Messrs. Houston and Sergel,
receive annually a retainer of $20,000 and 300 common shares of NEES, and
receive a meeting fee of $1,000 plus expenses for each meeting attended.
 
    The Chairman of the Executive Committee receives an annual retainer of
$12,000. Other members of the Executive Committee, except Messrs. Houston and
Sergel, receive an annual retainer of $5,000. The Chairmen of the Audit,
Compensation, Corporate Governance, and Corporate Responsibility Committees each
receive an annual retainer of $6,000. Other members of the Audit, Compensation,
and Corporate Responsibility Committees, except Messrs. Houston and Sergel,
receive annual retainers of $4,000. There is no retainer for the other members
of the Corporate Governance Committee. All directors participating in a
Committee meeting, except Messrs. Houston and Sergel, receive a meeting fee of
$1,000 plus expenses.
 
    NEES permits directors to defer all or a portion of any cash retainers,
meeting fees, and retainer shares under a deferred compensation plan. At the end
of the deferral period, the compensation is paid out in the same form, cash or
shares, as was deferred. Deferred shares do not have voting rights or
 
                                       50
<PAGE>
other rights associated with ownership while deferred. A special account is
maintained on NEES's books showing the amounts deferred and the interest or
dividends accrued thereon.   Group life insurance of $80,000 is provided to each
member of the Board of Directors. Director contributions to qualified charities
are matched by NEES under a matching gift program, which has a maximum limit of
$3,500.
 
    Pursuant to a director retirement plan, nonemployee directors who have
served on the Board of NEES for 5 years or more will receive a retirement
benefit upon the later of the director's retirement from the Board or age 60.
The benefit level is 100% of the annual cash retainer for directors who served
on the Board for 10 or more years and 75% of the annual cash retainer for
directors who served between 5 and 10 years. There are no death benefits under
the plan.
 
ATTENDANCE
 
    The Board of Directors held 13 meetings in 1998. The Executive, Audit,
Compensation, Corporate Governance, and Corporate Responsibility Committees held
3, 3, 7, 3, and 3 meetings, respectively, in 1998. All directors attended at
least 75% of the aggregate number of meetings of the Board of Directors and the
committees of which they were members.
 
RELATIONSHIPS BETWEEN DIRECTORS AND NEES OR ITS SUBSIDIARIES
 
    During 1998, Mr. Joskow did consulting work for NEES or subsidiaries of NEES
under a separate consulting contract for which he was paid approximately
$30,000. These consulting services were not related to his duties as a Board
member.
 
    Mr. Winoker is Chief Executive Officer of Belvoir Properties, Inc.
(Belvoir). Belvoir leases two parcels of land in Providence, Rhode Island from a
subsidiary of NEES under a twenty-year lease with an initial annual rent of
approximately $60,000.
 
    In 1998, Applied Resources Integrated Services, Inc. (ARIS) was awarded a
contract in a competitive process by a subsidiary of NEES. ARIS is owned by a
son and daughter of Mr. Bulger. The contract is for services related to an
energy efficiency lighting program beginning in 1999. ARIS will be paid up to
$200,000 per year under the contract. It is a two year contract with an option
to extend for an additional year.
 
                         COMPLIANCE WITH SECTION 16(A)
                                   REPORTING
 
    The rules of the Securities and Exchange Commission require that NEES
disclose late filings of reports of share ownership (and changes in share
ownership) by its directors and executive officers. To the best of NEES's
knowledge, there were no late filings during 1998.
 
                                       51
<PAGE>
                                SHARE OWNERSHIP
 
    The following table lists the holdings of NEES common shares and deferred
shares by NEES's directors, the executive officers named in the Summary
Compensation Table, and for directors and all executive officers as a group. The
information includes all whole shares beneficially owned, directly or
indirectly, as of January 20, 1999.
 
<TABLE>
<CAPTION>
                                                                           SHARES       DEFERRED
                                                                         BENEFICIALLY     SHARE
NAME                                                                      OWNED(A)    EQUIVALENTS(B)   TOTAL
- -----------------------------------------------------------------------  -----------  -------------  ---------
<S>                                                                      <C>          <C>            <C>
Joan T. Bok............................................................      14,016        --           14,016
William M. Bulger......................................................         100         2,420        2,520
Alfred D. Houston......................................................      14,359        15,489       29,848
Michael E. Jesanis.....................................................       4,316         7,188       11,504
Paul L. Joskow.........................................................       2,829           635        3,464
David C. Kennedy.......................................................       8,236         4,439       12,675
John M. Kucharski......................................................       3,100        --            3,100
Edward H. Ladd.........................................................       6,746           308        7,054
Cheryl A. LaFleur......................................................       3,595         7,147       10,742
Joshua A. McClure......................................................       2,255           693        2,948
John W. Rowe(c)........................................................       5,704        26,418       32,122
George M. Sage.........................................................       4,300        --            4,300
Richard P. Sergel......................................................       8,574        12,069       20,643
Charles E. Soule.......................................................       1,310         6,515        7,825
Anne Wexler............................................................       3,048        --            3,048
James Q. Wilson........................................................       3,655           308        3,963
James R. Winoker.......................................................       2,600        --            2,600
All of the above and other executive officers, as a group (18
  persons).............................................................      92,694(d)      86,814     179,508
</TABLE>
 
- ------------------------
 
(a) Number of shares beneficially owned includes:
 
    - shares directly owned by certain relatives with whom directors or officers
      share voting or investment power;
 
    - shares held of record individually by a director or officer or jointly
      with others or held in the name of a bank, broker, or nominee for such
      individual's account;
 
    - shares in which certain directors or officers maintain exclusive or shared
      investment or voting power whether or not the securities are held for
      their benefit; and
 
    - with respect to the executive officers of NEES, allocated shares in the
      Incentive Thrift Plan described below.
 
(b) Deferred share equivalents are held under NEES's Deferred Compensation Plan
    or pursuant to individual deferral agreements. Under the plan or deferral
    agreements, executives may elect to defer cash compensation and share
    awards. There are various deferral periods available under the plans. At the
    end of the deferral period, the compensation is paid out in the same form,
    cash or shares, as was deferred. The rights of the executives to payment are
    those of general, unsecured creditors.
 
   While deferred, the shares do not have voting rights or other rights
    associated with ownership. As cash dividends are declared, the number of
    deferred share equivalents will be increased as if the dividends were
    reinvested in NEES's common shares.
 
                                       52
<PAGE>
   Deferred share equivalents for directors are held under the Directors
    Deferred Compensation Plan. See Board Structure and Compensation for a
    description of that plan.
 
   Potential share awards under the Long-Term Performance Share Award Plan are
    not included in this table.
 
(c) Mr. Rowe, former President and Chief Executive Officer, resigned effective
    February 6, 1998.
 
(d) Amount is less than 1% of the total number of shares of NEES outstanding.
 
    T. Rowe Price Trust Company, 100 East Pratt Street, Baltimore, MD 21202 is
the only person or group known to NEES as of January 20, 1999 to beneficially
own 5% or more of NEES's common shares. However, T. Rowe Price Trust Company
disclaims beneficial ownership of all such shares. As of December 31, 1998, T.
Rowe price owned 4,740,729 shares as trustee for NEES employee benefits plans,
including those discussed herein. This represented 8% of NEES common shares.
 
                           SHARE OWNERSHIP GUIDELINES
 
    NEES has long recognized the importance of consistent alignment of executive
interests with those of shareholders. In 1995, the Compensation Committee of the
Board voted that it is expected that executives will own shares or share
equivalents to certain minimum levels within five years of being subject to the
requirement.
 
    - For Mr. Sergel, the level is 40,000 shares.
 
    - For Mr. Houston, the level is 25,000 shares.
 
    - For the other executives listed in the Executive Compensation Summary
      Table, the level is 7,000 to 15,000 shares.
 
    - Other executives are expected to hold from 2,000 to 7,000 shares depending
      on their compensation levels and bonus plans.
 
    In 1996, the Board of Directors voted that members of the Board were
expected to own 2,500 shares within five years of being subject to that
requirement.
 
                                       53
<PAGE>
                      REPORT OF THE COMPENSATION COMMITTEE
                           ON EXECUTIVE COMPENSATION
 
To the Shareholders of
New England Electric System:
 
    The members of the Compensation Committee (the Committee) of the Board of
Directors have the responsibility for executive compensation, including the
administration of certain of NEES's incentive compensation plans.
 
    NEES's total compensation package is designed to attract, retain, and reward
superior managers who are committed to solid financial performance and who can
also successfully lead NEES as our industry becomes increasingly competitive.
The compensation package reflects the fact that these managers' backgrounds are
suitable to a broader industrial marketplace and are not necessarily limited to
NEES or its industry. Total compensation consists of Base Salary, Incentive
Compensation (performance based, at risk compensation), and Benefits. The
Committee periodically reviews each component of NEES's executive compensation
program to ensure that pay levels and incentive opportunities are competitive
and that incentive opportunities are linked to NEES performance. NEES's general
compensation philosophy is that (1) the Base Salary ranges should be
competitive, with individual salaries reflecting performance and experience; (2)
a significant portion of management compensation should be tied to achievement
of corporate goals in order to maintain a sharp focus on corporate performance;
(3) substantial portions of incentive compensation should be in shares so as to
consistently align the interest of management and NEES's shareholders and
customers; and (4) an ever higher percentage of total compensation should be at
risk and share based as one moves upward through management. The compensation of
the Chief Executive Officer, Mr. Sergel, is based on these considerations.
 
COMPENSATION DECISIONS
 
    The Board of Directors votes the compensation of Mr. Sergel and Mr. Houston
acting upon recommendations of the Compensation Committee. The Committee reports
its decisions to the Board of Directors. After meeting in executive session and
discussing the reports made by the Committee, the Board of Directors has
unanimously accepted each of the recommendations described below made in 1998
and to date in 1999. However, as described in the Supplemental Report, which
follows, the Board (including the members of the Compensation Committee) later
increased Mr. Sergel's base compensation for 1999.
 
    The Compensation Committee votes the compensation of all other NEES
executive officers listed in the Summary Compensation Table, as well as other
senior employees. The Board has ratified the compensation decisions for these
executive officers. Although NEES management may be present during Committee
discussions of officers' compensation, Committee decisions with respect to the
compensation of Mr. Sergel and Mr. Houston were reached in executive session.
 
    Under Section 162(m) of the Internal Revenue Code, tax deductions are
limited for compensation above $1 million, not including amounts deferred. Given
the mandatory deferral of their share awards by Messrs. Sergel and Houston, the
Code provisions do not currently impact NEES. Total compensation for each of the
other executive officers is also below the $1 million threshold. The Committee
has not, therefore, had to address issues related to Section 162(m) and does not
expect to in the near future, but will continue to monitor these issues.
 
BASE SALARY
 
    Base Salary levels are established after consideration of the appropriate
market to determine the salary range for a position. Extensive salary survey
analyses are compiled annually and presented to the Committee for review. Salary
ranges are then defined on the basis of those market surveys. These
 
                                       54
<PAGE>
surveys may include some of the same companies included in incentive
compensation plan comparisons or in the corporate performance chart.
 
    In March 1998 the Committee reviewed the compensation of the System officers
(other than Messrs. Sergel and Houston) in light of their additional
responsibilities. The Committee considered relevant base pay market data
including both utility and general industry surveys. The Committee then set the
1998 compensation levels for those individuals.
 
    At the meeting of November 23, 1998, the Committee considered data from
multiple surveys from a number of independent consultants on senior executive
compensation levels for comparable utilities and for industry in general. They
then discussed the events of the preceding year and reflected upon the changes
in the industry, the significant progress NEES had made as a leader in the
restructuring of the industry, and the successful sale of NEES's nonnuclear
generation business. In this context, the contributions of both Mr. Houston and
Mr. Sergel in assuming the leadership of NEES and in continuing its success were
evaluated. The Committee then voted to recommend to the full Board that Mr.
Houston's and Mr. Sergel's base compensation be each set at $500,000 for 1999.
 
    At the same November meeting the Committee reviewed NEES's compensation
philosophy, set out above, and discussed the need to adequately reward employees
when compared to the utility and broader industry averages and the need to
retain valuable contributors. The Committee then considered comparative market
compensation data, and individual performance and responsibilities. After
consultation with Messrs. Houston and Sergel, the Committee set the compensation
levels for 1999 for the other senior executives.
 
PERFORMANCE BASED INCENTIVE COMPENSATION
 
    Performance Based Incentive Compensation (at risk compensation or bonus) is
designed to deliver rewards above base salary, if NEES and the individual
executives perform well.
 
    ANNUAL TARGET PLANS
 
    In 1997, the Committee reevaluated the existing annual bonus plans because:
NEES's shifting from being a vertically integrated utility to being primarily a
transmission and distribution company; comparative ROE and cost per
kilowatt-hour measurements becoming less appropriate as the prime measures of
success as different utilities proceed through competitive transitions at
different times and at different rates; and NEES's strategic plan calling for
significant new business development in competitive new areas.
 
    The incentive compensation plans were therefore revised to be reflective of
the achievement of operating income from the core business and strategic
objectives. Annual income targets and strategic objectives are established by
the Board of Directors for each year. For 1998 those objectives were: achieving
recovery of stranded investments; maximizing the return on the sale of the
generation business; running the best wires business in the Northeast;
increasing the size of the energy delivery business; and profiting from growth
in unregulated ventures. Benchmarks were established for each of these
objectives.
 
    Mr. Sergel's and Mr. Houston's bonuses under the plan were directly related
to achievement of the above described corporate objectives.
 
    Participants in the senior plan and other principal System officers share
all five of these objectives. Other participants may have some but not all of
these objectives depending upon their responsibilities within NEES. For Messrs.
Sergel and Houston, achievement of the operating income objective would provide
a formula bonus of 15% of base pay. Achievement of an operating income objective
above the target and achievement of all strategic objectives in full would
generate a calculated cash award of up to 50% of base pay. The Committee retains
discretion within the plan to adjust the final calculation to reflect
extraordinary events.
 
                                       55
<PAGE>
    At the January 1999 meeting, upon considering the performance of NEES during
the previous year, the Committee increased the weighting for merger activities
in consideration of the value of the merger with the National Grid Group which
had been brought forward by Messrs. Sergel and Houston. It was the Committee's
judgment that their performance significantly exceeded the design of the plan
and the Committee's expectations when establishing the strategic objectives for
1998. Accordingly, the Committee recommended to the Board that the cash bonuses
for Messrs. Sergel and Houston be set at 62.5% of base compensation.
 
    The participants in the incentive compensation plans are also awarded common
shares of NEES under the Incentive Share Plan, approved by the shareholders in
1990. No discretion is exercised by the Committee in the awarding of shares
generated by the formulae. An individual's award of shares under the Incentive
Share Plan is a fixed percentage of her or his cash award for that year from the
incentive compensation plan in which she or he participates. For Mr. Sergel and
Mr. Houston, the percentage was 60%. If no cash award is made, no shares are
distributed under the formulae. Further, total plan awards of shares in any
calendar year cannot exceed one-half of one percent (0.5%) of the number of
outstanding shares at the end of the previous calendar year. (The incentive plan
shares awarded, including those restricted or deferred, for 1998 were
approximately 0.07% of the number of outstanding shares.) As noted above under
Share Ownership Guidelines, the share awards of NEES officers were restricted
for 1998.
 
THREE-YEAR TARGET PLAN
 
    In order to increase executive focus on multi-year performance, NEES
established in 1995 the Long-Term Performance Share Award Plan described below.
The first payout under this plan for the three year cycle ended December 31,
1998 was made in February 1999.
 
    Awards for this plan are based upon various measures of NEES performance
over a three-year period. Each award factor or measurement functions
independently. The factors change from year to year and include financial and
operating performance. The factors may be related to those in the incentive
plans. The factors are established by the Committee at the beginning of each
cycle. All participants share the same factors and factor weights. Performance
is rated on rolling three-year periods, with a new cycle beginning each year. An
individual's potential award under the plan is a fixed percentage of her or his
base pay on January 1 of the first year of the plan measurement period.
Percentages range from 15% to 50%. No dividends accrue on the allocated shares
until awarded. At the end of the three-year cycle, the participant receives
actual shares based upon the performance against the various factors. For
example, for the first cycle, 20% of the shares were dependent upon the relative
shareholder return on equity (as shown in the following chart) as compared to a
national grouping of utilities. The return on equity was at the 73(rd)
percentile, producing an 85% payment for this goal. The total calculated award
for the plan cycle 1996-1998 was 77% of the allocated shares.
 
BENEFITS
 
    The executive benefits are designed both to provide a competitive package
and to retain flexibility for NEES in staffing management to meet changing
conditions.
 
Respectfully submitted,
 
NEW ENGLAND ELECTRIC SYSTEM COMPENSATION COMMITTEE
 
George M. Sage, Chairman
John M. Kucharski
Anne Wexler
 
                                       56
<PAGE>
                 SUPPLEMENTAL REPORT OF THE BOARD OF DIRECTORS
                           ON EXECUTIVE COMPENSATION
 
To the Shareholders of New England Electric System:
 
    As noted in the preceding report of the Compensation Committee, the Board of
Directors had approved each of the recommendations of the Compensation
Committee. At its meeting on December 11, 1998, relating to the proposed merger
with the National Grid Group, the Board again considered Mr. Sergel's leadership
in developing the merger. In light of this and the Board's subjective judgment
as to the continued value of Mr. Sergel to NEES, they increased his 1999 base
compensation to $550,000.
 
Respectfully submitted,
 
NEW ENGLAND ELECTRIC SYSTEM BOARD OF DIRECTORS
 
Joan T. Bok
William M. Bulger
Alfred D. Houston
Paul L. Joskow
John M. Kucharski
 
Edward H. Ladd
Joshua A. McClure
George M. Sage
Richard P. Sergel
 
Charles E. Soule
Anne Wexler
James Q. Wilson
James R. Winoker
 
                                       57
<PAGE>
CORPORATE PERFORMANCE
 
TOTAL RETURN
 
    The following graph shows total shareholder return for NEES (capital
appreciation plus reinvested dividends) for the years 1993 through 1998, as
compared to the Standard & Poor's 500 Index and the Edison Electric Institute
(EEI) Index of 100 investor-owned electric companies, assuming the investment of
$100 on December 31, 1993.
 
                               TOTAL RETURN
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             NEES      S&P 500   EEI INDEX
<S>        <C>        <C>        <C>
1993          100.00     100.00      100.00
1994           87.70     101.32       88.43
1995          115.87     139.40      115.86
1996          108.82     171.40      117.25
1997          142.28     228.58      149.33
1998          169.06     294.30      170.07
</TABLE>
 
<TABLE>
<CAPTION>
                                                1993       1994       1995       1996       1997       1998
                                              ---------  ---------  ---------  ---------  ---------  ---------
<S>                                           <C>        <C>        <C>        <C>        <C>        <C>
NEES........................................     100.00      87.70     115.87     108.82     142.28     169.06
S&P 500.....................................     100.00     101.32     139.40     171.40     228.58     294.30
EEI Index...................................     100.00      88.43     115.86     117.25     149.33     170.07
</TABLE>
 
- ------------------------
 
Note:  The share price performance shown on the graph above is not necessarily
       indicative of future price performance.
 
                                       58
<PAGE>
RETURN ON EQUITY
 
    The following graph shows the return on equity of NEES common shares for the
years 1994 through 1998 compared to a national grouping of approximately 80
electric utilities and a regional grouping of utilities in the New York and New
England area. As discussed in the report of the Compensation Committee, return
on equity has been a key driver of NEES's incentive compensation program.
 
                               RETURN ON EQUITY
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             NEES     NATIONAL GROUPING   REGIONAL GROUPING
<S>        <C>        <C>                 <C>
1994          12.73%              11.42%              11.40%
1995          12.78%              11.72%              10.43%
1996          12.58%              11.41%              11.13%
1997          12.84%              10.89%              10.60%
1998          11.37%              11.28%              10.33%
</TABLE>
 
<TABLE>
<CAPTION>
                                                       1994       1995       1996       1997       1998
                                                     ---------  ---------  ---------  ---------  ---------
<S>                                                  <C>        <C>        <C>        <C>        <C>
NEES...............................................      12.73%     12.78%     12.58%     12.84%     11.37%
National Grouping..................................      11.42%     11.72%     11.41%     10.89%     11.28%
Regional Grouping..................................      11.40%     10.43%     11.13%     10.60%     10.33%
</TABLE>
 
- ------------------------
 
Note:  The earnings performance shown on the graph above is not necessarily
       indicative of future performance.
 
                                       59
<PAGE>
                             EXECUTIVE COMPENSATION
 
    The following table gives information with respect to all compensation for
services in all capacities for NEES and its subsidiaries for the years 1996
through 1998 to or for the benefit of the Chief Executive Officers and the four
other most highly compensated executive officers of NEES.
 
                           SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>
                                                   ANNUAL COMPENSATION (b)                      LONG TERM
                                         -------------------------------------------           COMPENSATION
                                                                      OTHER ANNUAL    ------------------------------
     NAME AND PRINCIPAL                                               COMPENSATION    RESTRICTED SHARE      LTIP
        POSITION (a)            YEAR       SALARY($)    BONUS($)(c)      ($)(d)         AWARDS($)(e)     PAYOUTS($)
- ----------------------------  ---------  -------------  -----------  ---------------  -----------------  -----------
<S>                           <C>        <C>            <C>          <C>              <C>                <C>
Richard P. Sergel,..........       1998      437,500       289,382         12,233           165,952         100,166
  President and Chief              1997      244,893       242,020          8,764            51,043
  Executive Officer                1996      212,700       110,724          5,366           138,376
  (elected 2/6/98)
 
John W. Rowe,...............       1998      127,882         6,600          5,635                 0               0
  Former President                 1997      597,600       285,692         12,599           152,206
  and Chief Executive
    Officer                        1996      537,600       287,896          9,093           370,288
  (resigned 2/6/98)
 
Alfred D. Houston,..........       1998      442,694       294,951         10,227           167,893         157,751
  Chairman                         1997      345,072       314,028          9,616            88,573
                                   1996      335,016       167,306          6,265           182,267
 
Cheryl A. LaFleur,..........       1998      209,132       117,577          7,992            54,387          39,024
  Senior Vice President,           1997      176,388       192,437          6,827            37,768
  General Counsel                  1996      165,624        89,477          4,059           106,020
  and Secretary
 
Michael E. Jesanis,.........       1998      206,010       115,467          8,040            53,376          34,834
  Senior Vice President            1997      164,736       188,213          7,399            31,866
  and Chief Financial
    Officer                        1996      153,995        80,070          4,007           101,376
 
David C. Kennedy,...........       1998      186,658        96,257         12,487            40,032          35,808
  Vice President
  (elected 2/98)
 
<CAPTION>
                                 ALL OTHER
     NAME AND PRINCIPAL        COMPENSATION
        POSITION (a)              ($)(f)
- ----------------------------  ---------------
<S>                           <C>
Richard P. Sergel,..........           718
  President and Chief                  781
  Executive Officer                  3,535
  (elected 2/6/98)
John W. Rowe,...............         1,673
  Former President                   2,544
  and Chief Executive
    Officer                          4,891
  (resigned 2/6/98)
Alfred D. Houston,..........         2,594
  Chairman                           1,836
                                     4,649
Cheryl A. LaFleur,..........           439
  Senior Vice President,               335
  General Counsel                    3,251
  and Secretary
Michael E. Jesanis,.........           382
  Senior Vice President                320
  and Chief Financial
    Officer                          3,218
David C. Kennedy,...........           621
  Vice President
  (elected 2/98)
</TABLE>
 
- ------------------------------
 
(a) Officers of NEES also hold various positions with subsidiary companies.
    Compensation for these positions is included in this table.
 
(b) Includes deferred compensation in category and year earned.
 
(c) The bonus figures represent: cash bonuses under an incentive compensation
    plan; the all-employee goals program; the variable match of the Incentive
    Thrift Plan including related deferred compensation plan matches; special
    cash bonuses; and unrestricted shares under the Incentive Share Plan. See
    descriptions under Plan Summaries.
 
   In 1996 and 1997, the bonus amounts were all cash or contributions to the
    Incentive Thrift Plan, including related deferred compensation plan matches.
 
(d) Includes amounts reimbursed by NEES for the payment of taxes on certain
    noncash benefits and NEES contributions to the Incentive Thrift Plan that
    are not bonus contributions including related deferred compensation plan
    match. See description under Plan Summaries.
 
(e) The incentive share awards for the named executives were in the form of
    restricted shares (with a five-year restriction) or deferred share
    equivalents, deferred for receipt for at least five years, at the
    executive's option. As cash dividends are declared, the number of deferred
    share equivalents will be increased as if the dividends were reinvested in
    shares. See also Payments Upon a Change in Control below.
 
                                       60
<PAGE>
     As of December 31, 1998, the following executive officers held the amount
     of restricted shares and deferred share equivalents with the value
     indicated:
 
    - Mr. Sergel 9,581 shares, $461,085 value;
 
    - Mr. Rowe 29,847 shares, $1,436,386 value;
 
    - Mr. Houston 13,216 shares, $636,020 value;
 
    - Ms. LaFleur 6,552 shares, $315,315 value;
 
    - Mr. Jesanis 6,731 shares, $323,929 value;
 
    - Mr. Kennedy 3,617 shares, $174,068 value.
 
     The value was calculated by multiplying the closing market price on
     December 31, 1998, by the number of shares.
 
(f) Includes NEES contributions to life insurance. See description under Plan
    Summaries. The life insurance contribution is calculated based on the value
    of term life insurance for the named individuals. The premium costs for most
    of these policies have been or will be recovered by NEES. Prior to 1997,
    this column also included NEES contributions to the Incentive Thrift plan
    that are not bonus contributions. These figures are now included in the
    Other Annual Compensation column.
 
PAYMENTS UPON A CHANGE OF CONTROL OR TERMINATION OF EMPLOYMENT
 
    NEES has agreements with certain of its executives, including those named in
the Summary Compensation Table, which provide severance payments in the event of
certain terminations of employment following a Change in Control of NEES. These
are discussed at greater length at page 29. NEES's bonus plans, including those
described in the Compensation Committee Report, provide for payments equal to
the average of the bonuses for the three prior years in the event of a Change in
Control.
 
    The Board recognized the trend toward business combinations and
consolidation in the electric utility industry and considered it essential to
the best interests of its shareholders to foster the continuous employment of
key management personnel. In addition, the Board recognized that the possibility
of a change in control at NEES, as at other electric utilities, existed and that
such possibility, and the uncertainty and questions which it may raise among
management, could result in the departure or distraction of management personnel
to the detriment of NEES and its shareholders. Furthermore, the Board determined
that appropriate steps should be taken to reinforce and encourage the continued
attention and dedication of members of the management of the Company and its
subsidiaries to their assigned duties without distraction in the face of
potentially disturbing circumstances arising from the possibility of a change in
control. Accordingly, NEES determined that executive officers (including those
listed in the Summary Compensation Table, but excluding Messrs. Houston and
Sergel) would receive a benefit equal to one and one-half times annual
compensation, for a severance other than one for cause or following a change in
control.
 
                                 PLAN SUMMARIES
 
    A brief description of the various plans through which compensation and
benefits are provided to the named executive officers is presented below to
better enable shareholders to understand the information presented in the tables
shown earlier. The general provisions of the incentive compensation plans are
described in the report of the Compensation Committee. The amounts of
compensation and benefits provided to the named executive officers under the
plans described below are presented in the Summary Compensation Table.
 
    GOALS PROGRAM
 
    The Goals Program establishes goals annually. For 1998, these included goals
related to core operating income, costs to customers for electricity delivery,
safety, absenteeism, transmission and distribution reliability, environmental
and OSHA compliance, and customer satisfaction. Some goals apply to all
employees, while others apply to particular functional groups. Depending upon
the number of
 
                                       61
<PAGE>
goals met, and provided the minimum earnings goal is met, employees may earn a
cash bonus of 1% to 4 1/2% of their compensation.
 
    INCENTIVE THRIFT PLAN
 
    The Incentive Thrift Plan (a 401(k) program) provides for a match of 40% of
up to the first 5% of base compensation contributed to NEES's Incentive Thrift
Plan (shown under Other Annual Compensation in the Summary Compensation Table)
and, based on an incentive formula tied to core operating income, may fully
match the first 5% of base compensation contributed (the additional amount, if
any, is shown under Bonus in the Summary Compensation Table). Under Federal law,
contributions to these plans are limited. In 1998, the contribution amount was
limited to $10,000.
 
    DEFERRED COMPENSATION PLAN
 
    The Deferred Compensation Plan offers executives the opportunity to defer
base pay and bonuses. The plan offers the option of investing at the prime rate
or in NEES common shares; however, share bonuses may only be deferred in a share
account. Under Federal law, the Incentive Thrift Plan, described above, is
required to limit participant base compensation to $160,000 in calculating NEES
match. Under the Deferred Compensation Plan, NEES will make a contribution to an
executive's share account equivalent to the resultant reduction in his match
under the Incentive Thrift Plan.
 
    LIFE INSURANCE
 
    NEES has established for the named executive officers life insurance plans
funded by individual policies. The combined death benefit under these insurance
plans is three times the participant's annual salary. These plans are structured
so that, over time, NEES should recover the cost of the insurance premiums.
 
    After termination of employment, Messrs. Rowe and Houston may elect,
commencing at age 55 or later, to receive an annuity income equal to 40% of
final annual salary for Mr. Rowe and 22.5% of 1998 annual salary plus 40% of
final annual salary for Mr. Houston. In that event, the life insurance is
reduced over fifteen years to an amount equal to the participant's final annual
salary. Due to changes in the tax law, this plan has been closed to new
participants, and an alternative was established with only a life insurance
benefit.
 
    FINANCIAL COUNSELING
 
    NEES pays for personal financial counseling for senior executives. As
required by the IRS, a portion of the amount paid is reported as taxable income
for the executive. Financial counseling is also offered to other employees
through seminars conducted at various locations during each year.
 
    OTHER
 
    NEES does not have any share option plans.
 
              LONG TERM INCENTIVE PLAN--AWARDS IN LAST FISCAL YEAR
 
    The following table shows the potential awards, for those executive officers
named in the Summary Compensation Table, under the Long-Term Performance Share
Award Plan (more fully described in the Compensation Committee Report on page
54) for the performance cycle commencing January 1, 1998. NEES's performance
will be measured over the three-year period ending December 31, 2000.
 
    However, as discussed on page 32, upon the completion of the merger with
National Grid Group, the executives will receive awards based upon an average of
incentive compensation target achievement for the prior three years and not upon
the measures specified below.
 
                                       62
<PAGE>
                            ESTIMATED FUTURE PAYOUTS
                       UNDER NON-STOCK PRICE-BASED PLANS
 
<TABLE>
<CAPTION>
                                                              NUMBER OF
                                                            COMMON SHARE    PERFORMANCE
NAME                                                       EQUIVALENTS (A)    PERIOD       THRESHOLD (B)    TARGET (C)
- ---------------------------------------------------------  ---------------  -----------  -----------------  -----------
<S>                                                        <C>              <C>          <C>                <C>
Richard P. Sergel........................................         3,569        3 years              29           3,569
Alfred D. Houston........................................         4,310        3 years              34           4,310
Cheryl A. LaFleur........................................         2,293        3 years              18           2,293
Michael E. Jesanis.......................................         2,142        3 years              17           2,142
David C. Kennedy.........................................           987        3 years               8             987
</TABLE>
 
- ------------------------
 
(a) Amounts are denominated in common share units. No dividends are attributable
    to share units. At the end of the cycle, awards are paid in shares.
 
(b) The awards in this column represent the threshold number of shares that
    could be earned if the minimum attainment level is reached for one factor.
    The minimum payout upon failure to achieve any of the goals would be 0.
 
(c) The awards in this column represent the target (and maximum) number of
    shares that could be earned if the maximum performance is achieved for all
    factors.
 
    The Long-Term Performance Share Award Plan provides awards based on various
measures of NEES performance over a three-year period. Each award factor
functions independently. The performance targets for each cycle are set by the
Compensation Committee. The measures of performance for the cycle commencing
January 1, 1998 are as follows: total shareholder return, maintenance or
improvement of bond ratings; redeployment of the generation sale proceeds, and
system service levels, including customer satisfaction, reliability, safety, and
compliance.
 
                                RETIREMENT PLANS
 
    The following chart shows estimated annual benefits payable to executive
officers under the qualified pension plan and the supplemental retirement plan,
assuming retirement at age 65 in 1999.
 
                               PENSION PLAN TABLE
 
<TABLE>
<CAPTION>
  FIVE-YEAR
   AVERAGE     10 YEARS   15 YEARS   20 YEARS   25 YEARS   30 YEARS   35 YEARS
COMPENSATION    SERVICE    SERVICE    SERVICE    SERVICE    SERVICE    SERVICE
- -------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>            <C>        <C>        <C>        <C>        <C>        <C>
3$00,000.....     60,300     87,500    114,700    141,100    167,500    184,100
4$00,000.....     81,000    117,500    154,000    189,600    225,100    241,600
5$00,000.....    101,700    147,600    193,500    238,100    282,700    311,000
6$00,000.....    122,400    177,600    232,900    286,600    340,300    374,500
7$00,000.....    143,100    207,700    272,300    335,100    397,900    437,900
8$00,000.....    163,800    237,700    311,700    383,600    455,500    501,400
9$00,000.....    184,500    267,800    351,100    432,100    513,100    564,800
1$,000,000...    205,200    297,800    390,500    480,600    570,700    628,300
1$,100,000...    225,900    327,900    429,900    529,100    628,300    691,700
1$,200,000...    246,600    357,900    469,300    577,600    685,900    755,200
1$,300,000...    267,300    388,000    508,700    626,100    743,500    818,700
1$,400,000...    288,000    418,000    548,100    674,600    801,100    882,100
</TABLE>
 
                                       63
<PAGE>
    For purposes of the retirement plans, Mr. Sergel, Mr. Rowe, Mr. Houston, Ms.
LaFleur, Mr. Jesanis, and Mr. Kennedy currently have 20, 20, 35, 13, 16, and 26
credited years of service, respectively.
 
    Benefits under the pension plans are computed using formulae based on
percentages of highest average compensation computed over five consecutive
years. The compensation covered by the pension plan includes salary, bonus, and
incentive share awards. Long- Term Performance Share Awards will not be
included. The benefits listed in the pension table are not subject to deduction
for Social Security and are shown without any joint and survivor benefits. If
the participant elected at age 65 a 100% joint and survivor benefit with a
spouse of the same age, the benefit shown would be reduced by approximately 16%.
 
    The pension plan table above does not include annuity payments to be
received in lieu of life insurance for Messrs. Rowe and Houston. Those payments
are described above under Plan Summaries.
 
    NEES covers the full cost of post-retirement health benefits for the senior
executives listed in the Summary Compensation Table.
 
                        PROPOSAL 4--SHAREHOLDER PROPOSAL
 
    Mr. Edward P. Martin, 172 Broadway, Lynn, Massachusetts 01904, beneficial
owner of 3,714 shares of NEES, has stated his intention to present a proposal
concerning further disclosure of management compensation for consideration by
the shareholders at the Annual Meeting.
 
    The Board of Directors is opposed to Mr. Martin's proposal for the reasons
set forth below.
 
    The following are the text of the proposal and supporting statement supplied
by Mr. Martin:
 
RESOLVED:
 
    The Company issue a list of total compensation of the "100 Group" separating
expenses and in simple to understand dollars and cents. Including the annual
compensation of each Board of Directors member, separating all compensation from
expenses, just as the municipals list in their community newspapers i.e. City of
Peabody.
 
SUPPORTING STATEMENT:
 
    Why: To ensure we have the necessary number of workers in order to be the
best wires delivery business and aren't spending obscene amounts elsewhere. Guy
Nichols never earned more than $200,000 annually.
 
    Why: John Rowe, Rick and the Board helped double the value for shareholders
except it was Boston Edison's shareholders.
 
    Why: For closer shareholder review of the dollars of the "100 Group" and
Board of Directors. No executive for any reason will leave us like at LILCO with
$42 million.
 
    Finally, I urge you to not sign your proxy to Company and attend Annual
Meeting at Faneuil Hall. Boston is beautiful in April. Thank you.
 
Note:  The date of the meeting was changed to May 3, 1999 and the location of
       the meeting was changed to Mechanics Hall after Mr. Martin submitted his
       proposal.
 
                    RECOMMENDATION OF THE BOARD OF DIRECTORS
 
    The Board of Directors recommends a vote AGAINST the proposal.
 
    The Board believes that NEES supplies appropriate compensation disclosure to
shareholders for shareholders to make the decisions they need regarding NEES.
With respect to Board compensation,
 
                                       64
<PAGE>
the Board believes the proxy statement already fully discloses annual
compensation. See Director Compensation page 50. With respect to officers, the
top 5 most highly paid have their compensation for the last 3 years listed. See
the Compensation Table page 60. This is consistent with what other companies
supply their shareholders in compliance with the securities laws. Shareholders,
therefore, have an opportunity to judge the compensation levels of management
compared to other similar companies.
 
    To make compensation information public for an additional 95 employees would
put NEES at a competitive disadvantage since other companies do not do so. Other
companies or executive search firms might attempt to lure away key NEES
employees to the disadvantage of NEES shareholders. Disclosure of this personal
financial information of a large number of employees also raises privacy
concerns.
 
    Finally, the majority of NEES earnings comes from its subsidiaries which are
rate regulated. To the extent that these NEES subsidiaries cannot justify the
compensation levels of their employees, the regulators may deny recovery of such
costs in rates or reduce allowed return on equity.
 
                                 RECENT EVENTS
 
    On February 1, 1999, NEES, Research Drive LLC, a Massachusetts limited
liability company which is directly and indirectly wholly owned by NEES and EUA,
a Massachusetts business trust, entered into an Agreement and Plan of Merger,
providing for a merger transaction among NEES, Research Drive LLC and EUA. The
description of the EUA Merger Agreement set forth herein does not purport to be
complete and is qualified in its entirety by the provisions of the EUA Merger
Agreement, which has been filed with the SEC and is incorporated in this proxy
statement by reference.
 
    EUA is a Boston-based energy services holding company whose subsidiaries
include electric transmission and distribution utilities in southeastern
Massachusetts and northern and south coastal Rhode Island. These service
territories border the service territories of NEES's subsidiaries. The EUA
utilities provide electric service to approximately 300,000 customers.
 
    Upon completion of the EUA Merger, EUA's operations will be merged into
NEES's operations. The combined company will serve 1.7 million customers in 228
New England communities. NEES and EUA consistently have been the two
lowest-cost, major electric companies in the New England region. It is expected
that the geographical fit of the two companies will result in even greater
efficiencies.
 
    The NEES/National Grid Group merger and the EUA Merger are not contingent
upon the other. The EUA Merger has been consented to by National Grid Group.
NEES shareholders are not being asked to vote on the EUA Merger because no NEES
shares are being offered in connection with the EUA Merger, and because the NEES
Agreement and Declaration of Trust does not require that NEES shareholders
approve such a merger.
 
    Pursuant to the EUA Merger Agreement, Research Drive LLC will merge with and
into EUA with EUA being the surviving entity and becoming a wholly owned
subsidiary of NEES. The EUA Merger, which was approved by the NEES Board of
Directors, the EUA Board of Trustees and the Members of Research Drive LLC, is
expected to occur shortly after all of the conditions to the consummation of the
EUA Merger, including the receipt of certain regulatory approvals, are met or
waived. NEES expects that the EUA Merger will be completed in early 2000.
 
    Under the terms of the EUA Merger Agreement, each outstanding share of EUA's
common stock will be converted into the right to receive $31.00 in cash, as may
be adjusted (the "EUA Merger Consideration"). The cash payment for each EUA
common share will be subject to an increase of $0.003 per day if the EUA closing
date does not occur within six months after the EUA shareholders approve the EUA
Merger. The EUA Merger Agreement values the equity of EUA at approximately $634
million.
 
                                       65
<PAGE>
    The Board of Directors of NEES has received an opinion from its investment
banker, Merrill Lynch, to the effect that, as of January 30, 1999, the EUA
Merger Consideration to be paid by NEES pursuant to the EUA Merger is fair from
a financial point of view to NEES.
 
    The EUA Merger is subject to certain customary closing conditions,
including, without limitation, the receipt of the required approval of EUA's
shareholders by an affirmative vote of two-thirds of the outstanding EUA shares
and the receipt of all necessary governmental approvals and the making of all
necessary governmental filings. The following federal agency approvals must be
obtained in order to consummate the EUA Merger: (1) the approval of FERC under
Section 203 of the FPA, (2) the approval of the NRC pursuant to the Atomic
Energy Act of 1954 relating EUA holdings of minority common stock interests in
corporations that hold licenses issued by the NRC, and (3) the approval of the
SEC pursuant to the 1935 Act. In addition, prior to completing the EUA Merger,
the applicable waiting period under the HSR Act must expire or terminate.
 
    The approvals of the VPSB and the CDPUC may be required in order to
consummate the EUA Merger. Formal approval of the MDTE and RIPUC are not
required for the EUA Merger to be consummated; however, NEES and EUA will seek
regulatory approval from both agencies with respect to a rate plan that allows
for the recovery of the costs of acquisition and acquisition premium. The NHPUC
has jurisdiction to review the EUA Merger, however, if Montaup Electric Co., an
indirect wholly owned generation and transmission subsidiary of EUA, represents
to the NHPUC that the EUA Merger will not adversely affect its rates, terms,
service, or operation, formal NHPUC approval will not be required. The Maine
Public Utilities Commission ("MPUC") has limited jurisdiction over foreign
electric companies. If Montaup and EUA's Newport Electric Corp. subsidiary
provide MPUC with certificates from MDTE and RIPUC demonstrating regulatory
oversight of the Maine company in which EUA holds an interest, then the EUA
Merger would not be subject to MPUC approval.
 
    If the EUA Merger is consummated, then promptly following NEES's merger with
National Grid Group, NEES shall take the necessary action to cause all of the
members of the Board of Trustees of EUA to be appointed to serve on the advisory
board to be formed pursuant to the merger agreement with National Grid Group.
 
    NEES and EUA may jointly agree to terminate the EUA Merger Agreement. In
addition, either party may terminate the EUA Merger Agreement if (1) the EUA
merger has not been consummated by December 31, 1999 (the "EUA Initial
Termination Date"), PROVIDED, that if the parties are otherwise ready to close
but certain statutory approvals are not yet obtained, the Initial Termination
Date will be extended to April 30, 2000 (the "EUA Extended Termination Date"),
or (2) any law, rule or regulation is adopted which makes the EUA merger illegal
or any final order or injunction permanently prohibits the EUA Merger. NEES may
terminate the EUA Merger Agreement if: (1) EUA does not obtain its shareholders'
approval of the EUA Merger, (2) there has been a material breach of EUA's
representations and warranties or a failure by EUA to perform and comply with
its covenants under the EUA Merger Agreement and such breach or failure has not
been cured, (3) EUA's Board withdraws or modifies its approval of the EUA Merger
or its recommendation to its shareholders or (4) EUA's Board approves,
recommends or takes no position with respect to an alternative proposal. In
addition, EUA may terminate the EUA Merger Agreement: (1) if NEES fails to
deliver the EUA Merger Consideration at a time when all conditions to NEES's
obligation to close have been satisfied or waived, (2) if there has been a
material breach of NEES's representations and warranties or a failure to perform
and comply with its covenants under the EUA Merger Agreement and such breach or
failure has not been cured or (3) under certain circumstances in order to accept
an alternative proposal if EUA's Board determines that such termination is
necessary to act in a manner consistent with its fiduciary duties.
 
    EUA will pay NEES a termination fee of $20 million plus up to $5 million for
documented out-of-pocket expenses if: (1) EUA terminates the EUA Merger
Agreement because EUA became the
 
                                       66
<PAGE>
target of a third party alternative proposal, and EUA's Board determined that
termination was necessary for the Board to act consistently with its fiduciary
duties under applicable law or (2) at a time when an alternative business
proposal is pending: (A) NEES terminates the EUA Merger Agreement because EUA
shareholder approval was not obtained, (B) NEES terminates the EUA Merger
Agreement because EUA has materially breached its representations and warranties
or has failed to materially perform and comply with its covenants under the EUA
Merger Agreement, (C) NEES terminates the EUA Merger Agreement because the EUA
Board has withdrawn or modified its approval of the EUA merger, (D) NEES
terminates the EUA Merger Agreement because the EUA Board has approved or
recommended or taken no position with respect to an alternative proposal, or (E)
EUA terminates the EUA Merger Agreement because the EUA closing date has not
occurred by the Initial Termination Date, or if the Initial Termination Date is
extended, the Extended Termination Date, and in addition to (A), (B), (C), (D)
or (E), EUA executes a definitive agreement with respect to such alternative
proposal within two years of such termination.
 
    NEES will pay EUA a termination fee of $10 million plus up to $5 million for
documented out-of-pocket expenses if either NEES or EUA terminates because the
EUA closing date has not occurred on or before the Initial Termination Date, or
if the Initial Termination Date is extended, the Extended Termination Date,
provided, that the EUA closing has not failed to occur due to a failure on the
part of the terminating party to fulfill any obligation under the EUA Merger
Agreement, and on the date of such termination: (1) the condition to the EUA
closing that certain statutory consents and approvals be obtained shall not have
been fulfilled, (2) if the date of termination is any date other than the
Extended Termination Date or a date thereafter, all conditions of each party
other than the conditions concerning (A) statutory consents and approvals and
(B) the certification by each of NEES and Research Drive LLC that it performed
its obligations under the EUA Merger Agreement, shall have been fulfilled or
shall be capable of being fulfilled and (3) NEES's merger with National Grid
Group has not yet been consummated.
 
                    INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
    The firm of PriceWaterhouseCoopers LLP is the independent certified public
accountant appointed by the Board of Directors for NEES for the current calendar
year. Representatives of PriceWaterhouseCoopers LLP are expected to be present
at the Annual Meeting, will have the opportunity to make a statement if they
desire to do so, and are expected to be available to respond to appropriate
questions.
 
                                 OTHER MATTERS
 
    NEES is not aware of any matter that may properly be presented for action at
the meeting other than the matters set forth in this proxy statement. If any
other matter should be presented at the meeting upon which a vote properly may
be taken, including any matter of which NEES did not receive notice prior to
February 1, 1999 (such as a Non-Rule 14a-8 shareholder proposal), the proxies in
the accompanying form confer upon the persons named in such proxies, or their
substitutes, discretionary authority to vote in respect of any such matter in
accordance with their judgment.
 
           DEADLINE FOR SHAREHOLDER PROPOSALS FOR 2000 ANNUAL MEETING
 
    If the merger has not been consummated by such date, November 4, 1999 will
be the date by which proposals of shareholders of NEES intended to be presented
at the 2000 Annual Meeting of Shareholders of NEES must be received by NEES for
inclusion in NEES's proxy statement and form of proxy relating to that meeting.
 
    If the merger has not been consummated by such date, January 19, 2000 is the
deadline for giving timely notice of a shareholder proposal to be submitted
outside the processes of Rule 14a-8 under the
 
                                       67
<PAGE>
federal securities laws. Management proxies will be authorized to exercise
discretionary voting authority with respect to any shareholder proposal not
included in such proxy materials for the annual meeting of NEES unless NEES
receives notice of such proposal by January 19, 2000 and the conditions set
forth in Rule 14a-4(c)(2)(i)-(iii) under the Exchange Act are met.
 
                             AVAILABLE INFORMATION
 
    NEES files annual and quarterly reports, proxy statements and other
information with the U.S. Securities and Exchange Commission. You may read and
copy this information at the SEC's public reference rooms:
 
    Room 1024
    450 Fifth Street N.W.
    Judiciary Plaza
    Washington, D.C. 20549.
 
    New York Regional Office
    Suite 1300
    7 World Trade Center
    New York, New York 10048
 
    Chicago Regional Office
    Citicorp Center
    500 West Madison Street
    Suite 1400
    Chicago, Illinois 60661
 
    Because NEES's common shares are listed on the NYSE, you may also read our
filings at the offices of the New York Stock Exchange, 20 Broad Street, New
York, New York 10005. The SEC maintains a website on the Internet that contains
reports, proxy and information statements and other information regarding NEES.
The address of this website is http://www.sec.gov.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
    This proxy statement does not repeat important information that you can find
in NEES's reports and other documents that are filed with the SEC under the
Exchange Act. The SEC allows NEES to "incorporate by reference," which means
that NEES can disclose important information to you by referring you to other
documents which are legally considered to be a part of this proxy statement.
These documents are as follows:
 
    The following documents heretofore filed with the SEC by NEES in accordance
with the Exchange Act are incorporated by reference to this proxy statement:
 
    1.  NEES's 1998 Annual Report to Shareholders.
 
    2.  NEES's Annual Report on Form 10-K for the fiscal year ended December 31,
       1997.
 
    3.  NEES's Quarterly Report on Form 10-Q for the quarter ended March 31,
       1998, filed with the SEC on May 13, 1998.
 
    4.  NEES's Quarterly Report on Form 10-Q for the quarter ended June 30,
       1998, filed with the SEC on August 7, 1998.
 
    5.  NEES's Quarterly Report on Form 10-Q for the quarter ended September 30,
       1998, filed with the SEC on November 12, 1998.
 
                                       68
<PAGE>
    6.  NEES's Current Report on Form 8-K dated December 11, 1998, filed with
       the SEC on December 16, 1998.
 
    7.  NEES's Current Report on Form 8-K dated September 16, 1998, filed with
       the SEC on September 16, 1998.
 
    8.  NEES's Current Report on Form 8-K dated March 3, 1998, filed with the
       SEC on March 3, 1998.
 
    9.  NEES's Current Report on Form 8-K dated February 6, 1998, filed with the
       SEC on February 6, 1998.
 
    10. NEES's Current Report on Form 8-K dated February 1, 1999, filed with the
       SEC on February 2, 1999.
 
    11. NEES's Current Report on Form 8-K dated February 23, 1999, filed with
       the SEC on March 25, 1999.
 
    THESE DOCUMENTS (OTHER THAN EXHIBITS TO SUCH DOCUMENTS UNLESS SUCH EXHIBITS
ARE SPECIFICALLY INCORPORATED IN THIS PROXY STATEMENT BY REFERENCE) ARE
AVAILABLE TO ANY SHAREHOLDER ENTITLED TO VOTE AT THE ANNUAL MEETING, WITHOUT
CHARGE, ON WRITTEN OR ORAL REQUEST DIRECTED TO: MERRILL IR EDGE, 33 BOSTON POST
ROAD, SUITE 270, MARLBOROUGH, MASSACHUSETTS 01752, OR BY CALLING (508) 786-1907.
In order to ensure delivery of documents prior to the Annual Meeting, any such
request should be made not later than April 19, 1999. Copies of documents so
requested will be sent by first class mail, postage paid.
 
    All documents filed by NEES in accordance with Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this proxy statement and prior to
the date of the Annual Meeting will be deemed to be incorporated by reference in
this proxy statement and to be a part hereof from the respective dates of filing
of such documents.
 
    As you read the documents listed in this section, you may find some
inconsistencies in information from one document to another. If you find
inconsistencies between the documents and this proxy statement, you should rely
on the statement made in the most recent document.
 
    No persons have been authorized to give any information or to make any
representations other than those contained, or incorporated by reference, in
this proxy statement in connection with the solicitation of proxies made hereby,
and if given or made, such information or representations must not be relied
upon as having been authorized by NEES or any other person. All information
contained in this proxy statement relating to NEES has been supplied by NEES;
all information contained in this proxy statement relating to National Grid
Group or NGG Holdings has been supplied by National Grid Group. The delivery of
this proxy statement will not, under any circumstances, create an implication
that there has been no change in the affairs of NEES, National Grid Group or NGG
Holdings since the date hereof or that the information in this proxy statement
is correct as of any time subsequent to the date hereof.
 
    The name "New England Electric System" means the trustee or trustees for the
time being (as trustee or trustees but not personally) under an Agreement and
Declaration of Trust dated January 2, 1926, as amended, which is hereby referred
to, and a copy of which, as amended, has been filed with the Secretary of the
Commonwealth of Massachusetts. Any agreement, obligation, or liability made,
entered into, or incurred by or on behalf of New England Electric System binds
only its trust estate, and no shareholder, director, trustee, officer, or agent
thereof assumes or shall be held to any liability therefor.
 
                                       69
<PAGE>
                                                                      APPENDIX A
 
                                                           EXECUTION COUNTERPART
 
                          AGREEMENT AND PLAN OF MERGER
 
                         DATED AS OF DECEMBER 11, 1998
 
                                  BY AND AMONG
 
                          THE NATIONAL GRID GROUP PLC
 
                                   IOSTA LLC
 
                                      AND
 
                          NEW ENGLAND ELECTRIC SYSTEM
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                 PAGE
                                                                                                                  NO.
                                                                                                               ---------
<S>        <C>                                                                                                 <C>
ARTICLE I
THE MERGER...................................................................................................  A-1
1.01       The Merger........................................................................................  A-1
1.02       Effective Time....................................................................................  A-1
1.03       Effects of the Merger.............................................................................  A-1
 
ARTICLE II
CONVERSION OF SHARES.........................................................................................  A-1
2.01       Conversion of Capital Stock.......................................................................  A-1
2.02       Surrender of Shares...............................................................................  A-2
2.03       Withholding Rights................................................................................  A-3
 
ARTICLE III
THE CLOSING..................................................................................................  A-4
 
ARTICLE IV
REPRESENTATIONS AND WARRANTIES OF THE COMPANY................................................................  A-4
4.01       Organization and Qualification....................................................................  A-4
4.02       Capital Stock.....................................................................................  A-4
4.03       Authority.........................................................................................  A-5
4.04       Non-Contravention; Approvals and Consents.........................................................  A-6
4.05       SEC Reports, Financial Statements and Utility Reports.............................................  A-6
4.06       Absence of Certain Changes or Events..............................................................  A-7
4.07       Legal Proceedings.................................................................................  A-7
4.08       Information Supplied..............................................................................  A-7
4.09       Compliance........................................................................................  A-8
4.10       Taxes.............................................................................................  A-8
4.11       Employee Benefit Plans; ERISA.....................................................................  A-10
4.12       Labor Matters.....................................................................................  A-12
4.13       Environmental Matters.............................................................................  A-12
4.14       Regulation as a Utility...........................................................................  A-14
4.15       Insurance.........................................................................................  A-14
4.16       Nuclear Facilities................................................................................  A-14
4.17       Vote Required.....................................................................................  A-15
4.18       Opinion of Financial Advisor......................................................................  A-15
4.19       Ownership of Parent Ordinary Shares...............................................................  A-15
4.20       State Anti-Takeover Statutes......................................................................  A-15
4.21       Year 2000.........................................................................................  A-15
4.22       Company Associates................................................................................  A-15
 
ARTICLE V
REPRESENTATIONS AND WARRANTIES OF PARENT AND LLC.............................................................  A-16
5.01       Organization and Qualification....................................................................  A-16
5.02       Share Capital.....................................................................................  A-16
5.03       Authority.........................................................................................  A-17
5.04       Non-Contravention; Approvals and Consents.........................................................  A-17
5.05       Information Supplied..............................................................................  A-18
5.06       Compliance........................................................................................  A-18
5.07       Financing.........................................................................................  A-18
</TABLE>
 
                                      A-i
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                 PAGE
                                                                                                                  NO.
                                                                                                               ---------
<S>        <C>                                                                                                 <C>
5.08       Vote Required.....................................................................................  A-19
5.09       Ownership of Company Shares.......................................................................  A-19
 
ARTICLE VI
COVENANTS....................................................................................................  A-19
6.01       Covenants of the Company..........................................................................  A-19
6.02       Covenants of Parent...............................................................................  A-23
6.03       Additional Covenants by Parent and the Company....................................................  A-24
 
ARTICLE VII
ADDITIONAL AGREEMENTS........................................................................................  A-25
7.01       Access to Information.............................................................................  A-25
7.02       Proxy Statement and Circular......................................................................  A-25
7.03       Approval of Shareholders..........................................................................  A-26
7.04       Regulatory and Other Approvals....................................................................  A-26
7.05       Employee Benefit Plans............................................................................  A-26
7.06       Labor Agreements and Workforce Matters............................................................  A-28
7.07       Post Merger Operations............................................................................  A-28
7.08       No Solicitations..................................................................................  A-29
7.09       Directors' and Officers' Indemnification and Insurance............................................  A-30
7.10       Expenses..........................................................................................  A-31
7.11       Brokers or Finders................................................................................  A-31
7.12       Anti-Takeover Statutes............................................................................  A-31
7.13       Public Announcements..............................................................................  A-31
7.14       Restructuring of Merger...........................................................................  A-31
 
ARTICLE VIII
CONDITIONS...................................................................................................  A-32
8.01       Conditions to Each Party's Obligation to Effect the Merger........................................  A-32
8.02       Conditions to Obligation of Parent and LLC to Effect the Merger...................................  A-32
8.03       Conditions to Obligation of the Company to Effect the Merger......................................  A-33
 
ARTICLE IX
TERMINATION, AMENDMENT AND WAIVER............................................................................  A-34
9.01       Termination 45....................................................................................  A-34
9.02       Effect of Termination.............................................................................  A-35
9.03       Termination Fees..................................................................................  A-35
9.04       Amendment.........................................................................................  A-37
9.05       Waiver............................................................................................  A-37
 
ARTICLE X
GENERAL PROVISIONS...........................................................................................  A-37
10.01      Non-Survival of Representations, Warranties, Covenants and Agreements.............................  A-37
10.02      Notices...........................................................................................  A-37
10.03      Entire Agreement; Incorporation of Exhibits.......................................................  A-39
10.04      No Third Party Beneficiary........................................................................  A-39
10.05      No Assignment; Binding Effect.....................................................................  A-39
10.06      Headings..........................................................................................  A-39
10.07      Invalid Provisions................................................................................  A-39
10.08      Governing Law.....................................................................................  A-39
10.09      Submission to Jurisdiction; Waivers...............................................................  A-39
10.10      Enforcement of Agreement..........................................................................  A-40
</TABLE>
 
                                      A-ii
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                 PAGE
                                                                                                                  NO.
                                                                                                               ---------
<S>        <C>                                                                                                 <C>
10.11      Certain Definitions...............................................................................  A-40
10.12      Counterparts......................................................................................  A-41
10.13      WAIVER OF JURY TRIAL..............................................................................  A-41
</TABLE>
 
EXHIBITS
 
    EXHIBIT A    Form of Employment Agreement for Richard P. Sergel
 
                                     A-iii
<PAGE>
                           GLOSSARY OF DEFINED TERMS
 
    The following terms, when used in this Agreement, have the meanings ascribed
to them in the corresponding Sections of this Agreement listed below:
 
<TABLE>
<S>                                                                        <C>
"1935 Act"...............................................................  Section 4.05(b)
"1935 Act Order".........................................................  Section 9.01(h)
"Adjustment Date"........................................................  Section 2.01(c)
"Affected Employee"......................................................  Section 7.05(a)
"affiliate"..............................................................  Section 10.11(a)
"Agreement"..............................................................  Preamble
"Alternative Proposal"...................................................  Section 7.07
"beneficially"...........................................................  Section 10.11(b)
"business day"...........................................................  Section 10.11(c)
"Canceled Shares"........................................................  Section 2.02(b)
"Certificates"...........................................................  Section 2.02(b)
"Circular"...............................................................  Section 4.08(b)
"Closing"................................................................  Article III
"Closing Agreement"......................................................  Section 4.10(j)
"Closing Date"...........................................................  Article III
"Code"...................................................................  Section 2.03
"Companies Act"..........................................................  Section 5.02(a)
"Company"................................................................  Preamble
"Company Associates".....................................................  Section 4.01(b)
"Company Shares".........................................................  Preamble
"Company Disclosure Letter"..............................................  Section 4.01(a)
"Company Employee Benefit Plans".........................................  Section 4.11(a)
"Company Financial Statements"...........................................  Section 4.05(a)
"Company Nuclear Facilities".............................................  Section 4.16
"Company Material Adverse Effect"........................................  Section 4.01(a)
"Company Required Consents"..............................................  Section 4.04(a)
"Company Required Statutory Approvals"...................................  Section 4.04(b)
"Company SEC Reports"....................................................  Section 4.05(a)
"Company Shareholders' Approval".........................................  Section 7.03(b)
"Company Shareholders' Meeting"..........................................  Section 7.03(b)
"Company Significant Subsidiary".........................................  Section 7.08
"Company Share Plans"....................................................  Section 4.02(a)
"Confidentiality Agreement"..............................................  Section 7.01
"Constituent Entities"...................................................  Section 1.01
"Contracts"..............................................................  Section 4.04(a)
"control," "controlling," "controlled by" and "under common control
  with"..................................................................  Section 10.11(a)
"DOE"....................................................................  Section 4.05(b)
"Effective Time".........................................................  Section 1.02
                                                                           Section
"Environmental Claim"....................................................  4.13(f)(i)
                                                                           Section
"Environmental Laws".....................................................  4.13(f)(ii)
"Environmental Permits"..................................................  Section 4.13(b)
"ERISA"..................................................................  Section 4.11(a)
"ERISA Affiliate"........................................................  Section 4.11(c)
"Evaluation Material"....................................................  Section 7.01
"Exchange Act"...........................................................  Section 4.05(a)
"Exchange Fund"..........................................................  Section 2.02(a)
"Exon Florio"............................................................  Section 8.01(d)
"Extended Termination Date"..............................................  Section 9.01(b)
</TABLE>
 
                                      A-iv
<PAGE>
<TABLE>
<S>                                                                        <C>
"FCC"....................................................................  Section 4.05(b)
"FERC"...................................................................  Section 4.05(b)
"Final Order"............................................................  Section 8.01(e)
"Financial Disruption"...................................................  Section 9.03(d)
"Governmental Authority".................................................  Section 4.04(a)
                                                                           Section
"Hazardous Materials"....................................................  4.13(f)(iii)
"Houston Agreement"......................................................  Section 7.05(f)
"HSR Act"................................................................  Section 7.04(a)
"Indemnified Liabilities"................................................  Section 7.09(a)
"Indemnified Party"......................................................  Section 7.09(a)
"Initial Termination Date"...............................................  Section 9.01(b)
"Integration Team".......................................................  Section 6.03(b)
"IRS"....................................................................  Section 4.10(m)
"knowledge"..............................................................  Section 10.11(d)
"laws"...................................................................  Section 4.04(a)
"Lien"...................................................................  Section 4.02(b)
"LLC"....................................................................  Preamble
"LLC Agreement"..........................................................  Section 5.01
"LSE"....................................................................  Section 4.08(b)
"Massachusetts Secretary"................................................  Section 1.02
"Merger".................................................................  Preamble
                                                                           Section
"Merger Consideration"...................................................  2.01(b)(ii)
"MGL"....................................................................  Section 1.01
"NGC"....................................................................  Section 5.01
"NRC"....................................................................  Section 4.05(b)
"Options"................................................................  Section 4.02(a)
"orders".................................................................  Section 4.04(a)
"Out-of-Pocket Expenses".................................................  Section 9.03(a)
"Parent".................................................................  Preamble
"Parent Disclosure Letter"...............................................  Section 5.02(a)
"Parent Material Adverse Effect".........................................  Section 5.01(a)
"Parent Ordinary Share"..................................................  Section 5.02(a)
"Parent Reports".........................................................  Section 5.02(a)
"Parent Required Consents"...............................................  Section 5.04(a)
"Parent Required Statutory Approvals"....................................  Section 5.04(b)
"Parent Shareholders' Approval"..........................................  Section 7.03(a)
"Parent Shareholders' Meeting"...........................................  Section 7.03(a)
"Parent Voting Debt".....................................................  Section 5.02(d)
"Paying Agent"...........................................................  Section 2.02(a)
"PBGC"...................................................................  Section 4.11(g)
"person".................................................................  Section 10.11(e)
                                                                           Section
"Per Share Amount".......................................................  2.01(b)(ii)
"Post Closing Plans".....................................................  Section 7.05(c)
"Proxy Statement"........................................................  Section 4.08(a)
                                                                           Section
"Rabbi Trust Shares".....................................................  2.01(b)(i)
"Regulatory Termination Fee".............................................  Section 9.03(e)
                                                                           Section
"Release"................................................................  4.13(f)(iv)
"Representatives"........................................................  Section 10.11(f)
"SEC"....................................................................  Section 4.05(a)
"Securities Act".........................................................  Section 4.05(a)
"Special Share"..........................................................  Section 5.02(a)
"Subsidiary".............................................................  Section 10.11(g)
</TABLE>
 
                                      A-v
<PAGE>
<TABLE>
<S>                                                                        <C>
"Surviving Entity".......................................................  Section 1.01
"Tax Ruling".............................................................  Section 4.10(j)
"Tax Return".............................................................  Section 4.10
"Taxes"..................................................................  Section 4.10
"Trust Agreement"........................................................  Section 1.03
"US GAAP"................................................................  Section 4.05(a)
"Voting Debt"............................................................  Section 4.02(d)
"Yankee Companies".......................................................  Section 4.16
</TABLE>
 
                                      A-vi
<PAGE>
    This AGREEMENT AND PLAN OF MERGER, dated as of December 11, 1998 (this
"AGREEMENT"), is made and entered into by and among THE NATIONAL GRID GROUP PLC,
a public limited company incorporated under the laws of England and Wales with
registration number 2367004 ("PARENT"), IOSTA LLC, a Massachusetts limited
liability company which is directly and indirectly wholly owned by Parent
("LLC"), and NEW ENGLAND ELECTRIC SYSTEM, a Massachusetts business trust (the
"Company").
 
    WHEREAS, the Board of Directors of Parent and the Company and the members of
LLC have each determined that it is advisable and in the best interests of their
respective shareholders and members to consummate, and have approved, the
business combination transaction provided for herein in which LLC would merge
with and into the Company, with the Company being the surviving entity (the
"Merger"), pursuant to the terms and conditions of this Agreement, as a result
of which Parent will own, directly or indirectly, all of the issued and
outstanding common shares of the Company (the "Company Shares");
 
    WHEREAS, Parent, LLC and the Company desire to make certain representations,
warranties and agreements in connection with the Merger and also to prescribe
various conditions to the Merger;
 
    NOW, THEREFORE, in consideration of the mutual covenants and agreements set
forth in this Agreement, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:
 
                                   ARTICLE I
                                   THE MERGER
 
    1.01 THE MERGER. Upon the terms and subject to the conditions of this
Agreement, at the Effective Time (as defined in SECTION 1.02), LLC shall be
merged with and into the Company in accordance with Section 2 of Chapter 182 and
Section 59 of Chapter 156C of the Massachusetts General Laws ("MGL"). At the
Effective Time, the separate existence of LLC shall cease and the Company shall
continue as the surviving entity in the Merger. The Company, after the Effective
Time, is sometimes referred to herein as the "SURVIVING ENTITY" and the Company
and LLC are sometimes referred to herein as the "CONSTITUENT ENTITIES". The
effect and consequences of the Merger shall be as set forth in Article II.
 
    1.02 EFFECTIVE TIME. Subject to the provisions of this Agreement, on the
Closing Date (as defined in Article III), a certificate of merger shall be
executed and filed by the Company and LLC with the Secretary of the Commonwealth
of Massachusetts (the "MASSACHUSETTS SECRETARY"). The Merger shall become
effective at the time of the filing of the certificate of merger relating to the
Merger with the Massachusetts Secretary, or at such later time as is specified
in the certificate of merger (such date and time being referred to herein as the
"EFFECTIVE TIME").
 
    1.03 EFFECTS OF THE MERGER. At the Effective Time, the Agreement and
Declaration of Trust of the Company (the "TRUST AGREEMENT") as in effect
immediately prior to the Effective Time shall be the agreement and declaration
of trust of the Surviving Entity, until thereafter amended as provided by law
and such agreement and declaration of trust. Subject to the foregoing, the
additional effects of the Merger shall be as provided in the applicable
provisions of Section 2 of Chapter 182 of the MGL and Section 62 of the Limited
Liability Company Act of Massachusetts.
 
                                   ARTICLE II
                              CONVERSION OF SHARES
 
    2.01 CONVERSION OF CAPITAL STOCK. At the Effective Time, by virtue of the
Merger and without any action on the part of the holder thereof:
 
        (a) MEMBERSHIP INTERESTS OF LLC. Each one percent of the issued and
    outstanding membership interests in LLC shall be converted into one
    transferable certificate of participation or share of the Surviving Entity.
 
                                      A-1
<PAGE>
        (b) CONVERSION OF COMPANY SHARES.
 
           (i) CANCELLATION OF TREASURY SHARES AND SHARES OWNED BY PARENT AND
       SUBSIDIARIES. All Company Shares that are owned by the Company as
       treasury shares (excluding shares held as treasury shares pursuant to the
       New England Electric System Companies' Rabbi Trust effective January 1,
       1994, amended October 3, 1994 and amended December 2, 1996 (the "RABBI
       TRUST SHARES")) and any Company Shares owned by Parent, LLC or any other
       wholly owned Subsidiary (as defined in SECTION 10.11) of Parent shall be
       canceled and retired and shall cease to exist and no cash or other
       consideration shall be delivered in exchange therefor.
 
           (ii) CONVERSION OF COMPANY SHARES. Each Company Share issued and
       outstanding immediately prior to the Effective Time (other than shares to
       be canceled in accordance with SECTION 2.01(B)(I)) and each Rabbi Trust
       Share shall be canceled and converted in accordance with the provisions
       of this SECTION 2.01 into the right to receive cash in the amount (the
       "PER SHARE AMOUNT") of $53.75, as such amount may hereafter be adjusted
       in accordance with SECTION 2.01(C) hereof (the "MERGER CONSIDERATION"),
       payable, without interest, to the holder of such Company Share, upon
       surrender, in the manner provided in SECTION 2.02 hereof, of the
       certificate formerly evidencing such share.
 
        (c) ADJUSTMENT IN AMOUNT OF MERGER CONSIDERATION. In the event that the
    Closing Date shall not have occurred on or prior to the date that is the six
    (6) month anniversary of the date on which the Company Shareholders'
    Approval is obtained (the "ADJUSTMENT DATE"), the Per Share Amount shall be
    increased, for each day after the Adjustment Date up to and including the
    day which is one day prior to the Closing Date, by an amount equal to
    $0.003288; provided, however that the Per Share Amount shall not exceed
    $54.35.
 
    2.02 SURRENDER OF SHARES. (a) DEPOSIT WITH PAYING AGENT. Prior to the
Effective Time, Parent or LLC shall designate a bank or trust company reasonably
acceptable to the Company to act as agent (the "PAYING AGENT") for the benefit
of the holders of Company Shares in connection with the Merger to receive the
funds to which holders of Company Shares shall become entitled pursuant to
SECTION 2.01(B)(II) (the "EXCHANGE FUND"). From time to time at, immediately
prior to or after the Effective Time, Parent or LLC shall make or cause to be
made available to the Paying Agent immediately available funds in amounts and at
the times necessary for the payment of the Merger Consideration upon surrender
of Certificates (as defined in SECTION 2.02(B)) in accordance with SECTION
2.02(B), it being understood that any and all interest or other income earned on
funds made available to the Paying Agent pursuant to this SECTION 2.02(A) shall
belong to and shall be paid (at the time provided for in SECTION 2.02(E)) as
directed by Parent or LLC. Any such funds deposited with the Paying Agent by
Parent shall be invested by the Paying Agent as directed by Parent or LLC.
 
        (b) EXCHANGE PROCEDURE. As soon as practicable after the Effective Time,
    the Paying Agent shall mail to each holder of record of a certificate or
    certificates (the "CERTIFICATES") which immediately prior to the Effective
    Time represented outstanding Company Shares (the "CANCELED SHARES") that
    were canceled and became instead the right to receive the Merger
    Consideration pursuant to SECTION 2.01(B)(II): (i) a letter of transmittal
    in such form as Parent or LLC and the Company may reasonably agree (which
    shall specify that delivery shall be effected, and risk of loss and title to
    the Certificates shall pass, only upon actual delivery of the Certificates
    to the Paying Agent) and (ii) instructions for effecting the surrender of
    the Certificates in exchange for the Merger Consideration. Upon surrender of
    a Certificate or Certificates to the Paying Agent for cancellation (or to
    such other agent or agents as may be appointed by Parent or LLC and are
    reasonably acceptable to the Company), together with a duly executed letter
    of transmittal and such other documents as the Paying Agent shall require,
    the holder of such Certificate shall be entitled to receive the Merger
    Consideration in exchange for each Company Share formerly evidenced by such
    Certificate which such holder has the right to receive pursuant to SECTION
    2.01(B)(II). In the event of a transfer of ownership of Canceled Shares
    which is not registered in the transfer records of the Company,
 
                                      A-2
<PAGE>
    the Merger Consideration in respect of such Canceled Shares may be given to
    the transferee thereof if the Certificate or Certificates representing such
    Canceled Shares is presented to the Paying Agent, accompanied by all
    documents required to evidence and effect such transfer and by evidence
    satisfactory to the Paying Agent that any applicable stock transfer taxes
    have been paid. At any time after the Effective Time, each Certificate shall
    be deemed to represent only the right to receive the Merger Consideration
    subject to and upon the surrender of such Certificate as contemplated by
    this SECTION 2.02. No interest shall be paid or will accrue on the Merger
    Consideration payable to holders of Certificates pursuant to SECTION
    2.01(B)(II).
 
        (c) NO FURTHER OWNERSHIP RIGHTS IN COMPANY SHARES. The Merger
    Consideration paid upon the surrender of Certificates in accordance with the
    terms of SECTION 2.01(B)(II) shall be deemed to have been paid at the
    Effective Time in full satisfaction of all rights pertaining to the Company
    Shares represented thereby. From and after the Effective Time, the share
    transfer books of the Company shall be closed and there shall be no further
    registration of transfers thereon of the Company Shares which were
    outstanding immediately prior to the Effective Time. If, after the Effective
    Time, Certificates are presented to Parent for any reason, they shall be
    canceled and exchanged as provided in this SECTION 2.02.
 
        (d) LOST, STOLEN OR DESTROYED CERTIFICATES. In the event any owner of
    any Certificate shall claim that such Certificate shall have been lost,
    stolen or destroyed, upon the making of an affidavit of that fact by the
    owner of such Certificate and delivery of that affidavit to the Paying Agent
    and, if required by Parent or LLC, the posting by such person of a bond in
    customary amount as indemnity against any claim that may be made against
    Parent LLC, the Company or the Surviving Entity with respect to such
    Certificate, the Paying Agent will issue in exchange for such lost, stolen
    or destroyed Certificate the Merger Consideration payable upon due surrender
    of, and deliverable pursuant to this SECTION 2.02 in respect of, the Company
    Shares to which such Certificate relates.
 
        (e) TERMINATION OF EXCHANGE FUND. Any portion of the Exchange Fund which
    remains undistributed to the shareholders of the Company for one (1) year
    after the Effective Time shall be delivered to the Surviving Entity, upon
    demand, and any Shareholders of the Company who have not theretofore
    complied with this ARTICLE II shall thereafter look only to the Surviving
    Entity (subject to abandoned property, escheat and other similar laws) as
    general creditors for payment of their claim for the Merger Consideration
    payable upon due surrender of the Certificates held by them. None of Parent,
    LLC or the Surviving Entity shall be liable to any former holder of Company
    Shares for the Merger Consideration delivered to a public official pursuant
    to any applicable abandoned property, escheat or similar law.
 
    2.03 WITHHOLDING RIGHTS. Each of the Surviving Entity and Parent shall be
entitled to deduct and withhold from the consideration otherwise payable
pursuant to this Agreement to any holder of Company Shares such amounts as it is
required to deduct and withhold with respect to the making of such payment under
the Internal Revenue Code of 1986, as amended (the "CODE"), or any provision of
state, local or foreign tax law, including the tax laws of the United Kingdom;
PROVIDED, HOWEVER, that if such withholding may be eliminated or reduced through
the delivery of any certificate or other documentation, each of the Surviving
Entity and the Parent shall provide each holder of Company Shares with a
reasonable opportunity to deliver such certificate or other documentation. To
the extent that amounts are so withheld by the Surviving Entity or Parent, as
the case may be, such withheld amounts shall be treated for all purposes of this
Agreement as having been paid to the holder of Company Shares in respect of
which such deduction and withholding was made by the Surviving Entity or Parent,
as the case may be.
 
                                      A-3
<PAGE>
                                  ARTICLE III
                                  THE CLOSING
 
    The closing of the Merger and other transactions contemplated hereby (the
"CLOSING") will take place at the offices of LeBoeuf, Lamb, Greene & MacRae,
L.L.P., 260 Franklin Street, Boston, MA 02110, at 10:00 a.m., local time, on the
second business day following satisfaction or waiver (where applicable) of the
conditions set forth in ARTICLE VIII (other than those conditions that by their
nature are to be fulfilled at the Closing, but subject to the fulfillment or
waiver of such conditions), unless another date, time or place is agreed to in
writing by the parties hereto (the "CLOSING DATE").
 
                                   ARTICLE IV
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    The Company represents and warrants to Parent and LLC as follows:
 
    4.01 ORGANIZATION AND QUALIFICATION. (a) The Company is a voluntary
association duly organized, validly existing and in good standing under the laws
of the Commonwealth of Massachusetts and has full power, authority and legal
right to own its property and assets and to transact the business in which it is
engaged. Each of the Company's Subsidiaries is a corporation duly organized or
incorporated, validly existing and in good standing under the laws of its
jurisdiction of organization or incorporation and has full corporate power and
authority to conduct its business as and to the extent now conducted and to own,
use and lease its assets and properties, except where failure to be so organized
or incorporated, existing and in good standing or to have such power and
authority, individually or in the aggregate, could not reasonably be expected to
have a Company Material Adverse Effect. As used in this Agreement, the term
"COMPANY MATERIAL ADVERSE EFFECT" means a material adverse effect on the
business, assets, results of operations, condition (financial or otherwise) or
prospects of the Company and its Subsidiaries taken as a whole. Each of the
Company and its Subsidiaries is duly qualified, licensed or admitted to do
business and is in good standing in each jurisdiction in which the ownership,
use or leasing of its assets and properties, or the conduct or nature of its
business, makes such qualification, licensing or admission necessary, except
where failure to be so qualified, licensed or admitted and in good standing,
individually or in the aggregate, could not reasonably be expected to have a
Company Material Adverse Effect. SECTION 4.01 of the letter dated the date
hereof and delivered to Parent and LLC by the Company concurrently with the
execution and delivery of this Agreement (the "COMPANY DISCLOSURE LETTER") sets
forth (i) the name and jurisdiction of incorporation or organization of each
Subsidiary of the Company, (ii) such Subsidiary's authorized capital stock,
(iii) the number of issued and outstanding shares of capital stock of such
Subsidiary and (iv) the number of shares of such Subsidiary held of record by
the Company. The Company has previously delivered to Parent correct and complete
copies of the Trust Agreement and the certificate or articles of organization or
incorporation and bylaws (or other comparable charter documents) of its
Subsidiaries.
 
        (b) SECTION 4.01 of the Company Disclosure Letter sets forth a
description as of the date hereof, of all Company Associates, including (i) the
name of each such entity and the Company's interest therein and (ii) a brief
description of the principal line or lines of business conducted by each such
entity. For purposes of this Agreement "COMPANY ASSOCIATES" shall mean any
corporation or other entity (including partnerships and other business
associations) that is not a Company Subsidiary in which the Company and/or one
or more of its Subsidiaries, directly or indirectly, owns an equity interest
(other than short-term investments in the ordinary course of business) if such
corporation or other entity (including partnerships and other business
associations) contributes five percent or more of the Company's consolidated
revenues, assets, income or costs.
 
    4.02 CAPITAL STOCK. (a) The authorized equity securities of the Company
consists of 150,000,000 Company Shares, of which 59,170,986 shares were issued
and outstanding as of the close of business on December 11, 1998. As of the
close of business on December 11, 1998, 5,798,666 Company Shares were held in
the treasury of the Company (including 184,262 Rabbi Trust Shares). Since such
date, except as
 
                                      A-4
<PAGE>
described in the Company SEC Reports filed prior to the date of this Agreement
or in SECTION 4.02 of the Company Disclosure Letter, there has been no change in
the sum of the issued and outstanding Company Shares and Company Shares held in
the Rabbi Trust. All of the issued and outstanding Company Shares are duly
authorized, validly issued, fully paid and nonassessable. Except pursuant to
this Agreement or as may be provided by the New England Electric System
Companies' Incentive Share Plan, the New England Electric System Companies
Incentive Thrift Plan I, the New England Electric System Companies Incentive
Thrift Plan II, the New England Electric Companies Long-Term Performance Share
Award Plan, and the New England Electric System Directors' annual retainer
shares (the "COMPANY SHARE PLANS"), and except as described in SECTION 4.02 of
the Company Disclosure Letter, on the date hereof there are no outstanding
subscriptions, options, warrants, rights (including share appreciation rights),
preemptive rights or other contracts, commitments, understandings or
arrangements, including any right of conversion or exchange under any
outstanding security, instrument or agreement (together, "OPTIONS"), obligating
the Company or any of its Subsidiaries to issue or sell any shares of equity
securities of the Company or to grant, extend or enter into any Option with
respect thereto.
 
        (b) Except as disclosed in the Company SEC Reports filed prior to the
date of this Agreement or SECTION 4.02 of the Company Disclosure Letter, all of
the outstanding shares of capital stock of each Subsidiary of the Company are
duly authorized, validly issued, fully paid and nonassessable and are owned,
beneficially and of record, by the Company or a Subsidiary, which is wholly
owned, directly or indirectly, by the Company, free and clear of any liens,
claims, mortgages, encumbrances, pledges, security interests, equities and
charges of any kind (each a "LIEN"). Except as disclosed in the Company SEC
Reports filed prior to the date of this Agreement or SECTION 4.02 of the Company
Disclosure Letter, there are no (i) outstanding Options obligating the Company
or any of its Subsidiaries to issue or sell any shares of capital stock of any
Subsidiary of the Company or to grant, extend or enter into any such Option or
(ii) voting trusts, proxies or other commitments, understandings, restrictions
or arrangements in favor of any person other than the Company or a Subsidiary
which is wholly owned, directly or indirectly, by the Company with respect to
the voting of, or the right to participate in, dividends or other earnings on
any capital stock of any Subsidiary of the Company.
 
        (c) Except as disclosed in the Company SEC Reports filed prior to the
date of this Agreement or SECTION 4.02 of the Company Disclosure Letter, there
are no outstanding contractual obligations of the Company or any Subsidiary of
the Company to repurchase, redeem or otherwise acquire any Company Shares or any
capital stock of any Subsidiary of the Company or to provide funds to, or make
any investment (in the form of a loan, capital contribution or otherwise) in,
any Subsidiary of the Company or any other person.
 
        (d) As of the date of this Agreement, no bonds, debentures, notes or
other indebtedness of the Company or any Company Subsidiary having the right to
vote (or which are convertible into or exercisable for securities having the
right to vote) (together "VOTING DEBT") on any matters on which Shareholders may
vote are issued or outstanding nor are there any outstanding Options obligating
the Company or any of its Subsidiaries to issue or sell any Voting Debt or to
grant, extend or enter into any Option with respect thereto.
 
    4.03 AUTHORITY. The Company has full power and authority to enter into this
Agreement, to perform its obligations hereunder and, subject to obtaining the
Company Shareholders' Approval (as defined in SECTION 7.03(B)) and the Company
Required Statutory Approvals (as defined in SECTION 4.04(B)), to consummate the
Merger and other transactions contemplated hereby. The execution, delivery and
performance of this Agreement by the Company and the consummation by the Company
of the Merger and other transactions contemplated hereby have been duly
authorized by all necessary action on the part of the Company, subject to
obtaining the Company Shareholders' Approval with respect to the consummation of
the Merger and the other transactions contemplated hereby. This Agreement has
been duly and validly executed and delivered by the Company and constitutes a
legal,
 
                                      A-5
<PAGE>
valid and binding obligation of the Company enforceable against the Company in
accordance with its terms, except as enforceability may be limited by
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting the enforcement of creditors' rights generally and by general
equitable principles (regardless of whether such enforceability is considered in
a proceeding in equity or at law).
 
    4.04 NON-CONTRAVENTION; APPROVALS AND CONSENTS. (a) The execution and
delivery of this Agreement by the Company do not, and the performance by the
Company of its obligations hereunder and the consummation of the Merger and
other transactions contemplated hereby will not, conflict with, result in a
violation or breach of, constitute (with or without notice or lapse of time or
both) a default under, result in or give to any person any right of payment or
reimbursement, termination, cancellation, modification or acceleration of, or
result in the creation or imposition of any Lien upon any of the assets or
properties of the Company or any of its Subsidiaries or any of the terms,
conditions or provisions of (i) the Trust Agreement of the Company or the
certificates or articles of incorporation or organization or bylaws (or other
comparable charter documents) of the Company's Subsidiaries, or (ii) subject to
the obtaining of the Company Shareholders' Approval, the Company Required
Consents, the Company Required Statutory Approvals and the taking of any other
actions described in this SECTION 4.04, (x) any statute, law, rule, regulation
or ordinance (together, "LAWS"), or any judgment, decree, order, writ, permit or
license (together, "ORDERS"), of any court, tribunal, arbitrator, authority,
agency, commission, official or other instrumentality of the United States, any
foreign country or any domestic or foreign state, county, city or other
political subdivision (a "GOVERNMENTAL AUTHORITY") applicable to the Company or
any of its Subsidiaries or any of their respective assets or properties, or (y)
subject to obtaining the third-party consents set forth in Section 4.04 of the
Company Disclosure Letter (the "COMPANY REQUIRED CONSENTS"), any note, bond,
mortgage, security agreement, indenture, license, franchise, permit, concession,
contract, lease or other instrument, obligation or agreement of any kind
(together, "CONTRACTS") to which the Company or any of its Subsidiaries is a
party or by which the Company or any of its Subsidiaries or any of their
respective assets or properties is bound, excluding from the foregoing clauses
(x) and (y) such conflicts, violations, breaches, defaults, payments or
reimbursements, terminations, cancellations, modifications, accelerations and
creations and impositions of Liens which, individually or in the aggregate,
could not reasonably be expected to have a Company Material Adverse Effect.
 
        (b) No declaration, filing or registration with, or notice to or
authorization, consent or approval of, any Governmental Authority is necessary
for the execution and delivery of this Agreement by the Company or the
consummation by the Company of the Merger and other transactions contemplated
hereby except as described in SECTION 4.04 of the Company Disclosure Letter or
the failure of which to obtain could not reasonably be expected to result in a
Company Material Adverse Effect (the "COMPANY REQUIRED STATUTORY APPROVALS," it
being understood that references in this Agreement to "obtaining" such Company
Required Statutory Approvals shall mean making such declarations, filings or
registrations; giving such notices; obtaining such authorizations, consents or
approvals; and having such waiting periods expire as are necessary to avoid a
violation of law).
 
    4.05 SEC REPORTS, FINANCIAL STATEMENTS AND UTILITY REPORTS. (a) The Company
delivered to Parent prior to the execution of this Agreement a true and complete
copy of each form, report, schedule, registration statement, registration
exemption, if applicable, definitive proxy statement and other document
(together with all amendments thereof and supplements thereto) filed by the
Company or any of its Subsidiaries with the Securities and Exchange Commission
(the "SEC") under the Securities Act of 1933, as amended, and the rules and
regulations thereunder (the "SECURITIES ACT") and the Securities Exchange Act of
1934, as amended, and the rules and regulations thereunder (the "EXCHANGE ACT")
since December 31, 1995 (as such documents have since the time of their filing
been amended or supplemented, the "COMPANY SEC REPORTS"), which are all the
documents (other than preliminary materials) that the Company and its
Subsidiaries were required to file with the SEC under the Securities Act and the
Exchange Act since such date. As of their respective dates, the Company SEC
Reports (i) complied as to form in all material respects with the requirements
of the Securities Act or the
 
                                      A-6
<PAGE>
Exchange Act, as the case may be, and (ii) did not contain any untrue statement
of a material fact or omit to state a material fact required to be stated
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading. Each of the audited
consolidated financial statements and unaudited interim consolidated financial
statements (including, in each case, the notes, if any, thereto) included in the
Company SEC Reports (the "COMPANY FINANCIAL STATEMENTS") complied as to form in
all material respects with the published rules and regulations of the SEC with
respect thereto, were prepared in accordance with U.S. generally accepted
accounting principles ("US GAAP") applied on a consistent basis during the
periods involved (except as may be indicated therein or in the notes thereto and
except with respect to unaudited statements as permitted by Form 10-Q of the
SEC) and fairly present (subject, in the case of the unaudited interim financial
statements, to normal, recurring year-end audit adjustments (which are not
expected to be, individually or in the aggregate, materially adverse to the
Company and its Subsidiaries taken as a whole)) the consolidated financial
position of the Company and its consolidated subsidiaries as at the respective
dates thereof and the consolidated results of their operations and cash flows
for the respective periods then ended. Except as set forth in SECTION 4.05 of
the Company Disclosure Letter, each Subsidiary of the Company is treated as a
consolidated subsidiary of the Company in the Company Financial Statements for
all periods covered thereby.
 
        (b) All filings (other than immaterial filings) required to be made by
the Company or any of its Subsidiaries since December 31, 1995, under the Public
Utility Holding Company Act of 1935 (the "1935 ACT"), the Federal Power Act, the
Atomic Energy Act of 1954, the Communications Act of 1934, and applicable state
laws and regulations, have been filed with the SEC, the Federal Energy
Regulatory Commission (the "FERC"), the Department of Energy (the "DOE"), the
Nuclear Regulatory Commission (the "NRC"), the Federal Communications Commission
(the "FCC") or any appropriate state public utility commissions (including,
without limitation, to the extent required, the state public utility regulatory
agencies of Massachusetts, Rhode Island, New Hampshire, Connecticut, Vermont and
Maine), as the case may be, including all forms, statements, reports, agreements
(oral or written) and all documents, exhibits, amendments and supplements
appertaining thereto, including but not limited to all rates, tariffs,
franchises, service agreements and related documents and all such filings
complied, as of their respective dates, in all material respects with all
applicable requirements of the appropriate statute and the rules and regulations
thereunder.
 
    4.06 ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as set forth in Section
4.06 of the Company Disclosure Letter or as disclosed in the Company SEC Reports
filed prior to the date of this Agreement since December 31, 1997, the Company
and each of the Company Subsidiaries have conducted its business only in the
ordinary course of business consistent with past practice and there has not
been, and no fact or condition exists which, individually or in the aggregate,
has or could reasonably be expected to have a Company Material Adverse Effect.
 
    4.07 LEGAL PROCEEDINGS. Except as disclosed in the Company SEC Reports filed
prior to the date of this Agreement or in SECTION 4.07 of the Company Disclosure
Letter and except for environmental matters which are governed by SECTION 4.13,
(i) there are no actions, claims, hearings, suits, arbitrations or proceedings
pending or, to the knowledge of the Company or any of its Subsidiaries,
threatened against, specifically relating to or affecting, and, to the knowledge
of the Company or any of its Subsidiaries, there are no Governmental Authority
investigations or audits pending or threatened against, specifically relating to
or affecting, the Company or any of its Subsidiaries or any of their respective
assets and properties which, individually or in the aggregate, could reasonably
be expected to have a Company Material Adverse Effect and (ii) neither the
Company nor any of its Subsidiaries is subject to any order of any Governmental
Authority which, individually or in the aggregate, could reasonably be expected
to have a Company Material Adverse Effect.
 
    4.08 INFORMATION SUPPLIED. (a) The proxy statement relating to the Company
Shareholders' Meeting, as amended or supplemented from time to time (as so
amended and supplemented, the "PROXY
 
                                      A-7
<PAGE>
STATEMENT"), and any other documents to be filed by the Company with the SEC
(including, without limitation, under the 1935 Act) or any other Governmental
Authority in connection with the Merger and other transactions contemplated
hereby will comply as to form in all material respects with the requirements of
the Exchange Act, the Securities Act and the 1935 Act, as applicable, and will
not, on the date of their respective filings or, in the case of the Proxy
Statement, at the date it is mailed to Shareholders of the Company and at the
time of the Company Shareholders' Meeting (as defined in SECTION 7.03(B)),
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not
misleading, except that no representation is made by the Company with respect to
information supplied in writing by or on behalf of Parent or LLC expressly for
inclusion therein and information incorporated by reference therein from
documents filed by Parent or any of its Subsidiaries with the SEC.
 
        (b) The information supplied or to be supplied by the Company for
inclusion in any filing by Parent with the SEC or the London Stock Exchange
Limited (the "LSE") in respect of the Merger (including, without limitation, the
Super Class 1 circular to be issued to Shareholders of Parent (the "CIRCULAR"))
will not, at the date mailed to the Parent's Shareholders or at the time of the
Parent Shareholders' Meeting, contain any untrue statement of a material fact or
omit to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading and will be in accordance with the facts and will
not omit anything likely to affect the import of such information.
 
        (c) Notwithstanding the foregoing provisions of this SECTION 4.08, no
representation or warranty is made by the Company with respect to statements
made or incorporated by reference in the Proxy Statement or the Circular based
on information supplied by Parent or LLC for inclusion or incorporation by
reference therein.
 
    4.09 COMPLIANCE. Except as set forth in SECTION 4.09 of the Company
Disclosure Letter, or as disclosed in the Company SEC Reports filed prior to the
date hereof, neither the Company nor any of the Company Subsidiaries is in
violation of, is, to the knowledge of the Company, under investigation with
respect to any violation of, or has been given notice or been charged with any
violation of, any law, statute, order, rule, regulation, ordinance or judgment
(including, without limitation, any applicable environmental law, ordinance or
regulation) of any Governmental Authority, except for possible violations which,
individually or in the aggregate, could not reasonably be expected to have a
Company Material Adverse Effect. Except as set forth in SECTION 4.09 of the
Company Disclosure Letter or as disclosed in the Company SEC Reports filed prior
to the date hereof, the Company and the Company Subsidiaries have all permits,
licenses, franchises and other governmental authorizations, consents and
approvals necessary to conduct their businesses as presently conducted except
for such failures which could not reasonably be expected to have a Company
Material Adverse Effect. Neither the Company nor any of the Company Subsidiaries
is in breach or violation of, or in default in the performance or observance of
any term or provision of, (i) its Trust Agreement, in the case of the Company,
or articles of incorporation or organization or by-laws, in the case of the
Company's Subsidiaries, or (ii) any contract, commitment, agreement, indenture,
mortgage, loan agreement, note, lease, bond, license, approval or other
instrument to which it is a party or by which the Company or any Company
Subsidiary is bound or to which any of their respective property is subject,
except for possible violations, breaches or defaults which, individually or in
the aggregate, could not reasonably be expected to have a Company Material
Adverse Effect.
 
    4.10 TAXES. Except as disclosed in SECTION 4.10 of the Company Disclosure
Letter and except as to any items that could not reasonably be expected to have
a Company Material Adverse Effect:
 
        (a) FILING OF TIMELY TAX RETURNS. The Company and each of its
Subsidiaries have filed all Tax Returns required to be filed by each of them
under applicable law. All Tax Returns were in all material
 
                                      A-8
<PAGE>
respects (and, as to Tax Returns not filed as of the date hereof, will be) true,
complete and correct and filed on a timely basis;
 
        (b) PAYMENT OF TAXES. The Company and each of its Subsidiaries have,
within the time and in the manner prescribed by law, paid (and until the Closing
Date will pay within the time and in the manner prescribed by law) all Taxes
that are currently due and payable except for those contested in good faith and
for which adequate reserves have been taken;
 
        (c) TAX RESERVES. The Company and its Subsidiaries have established (and
until the Closing Date will maintain) on their books and records reserves
adequate to pay all Taxes and reserves for deferred income taxes in accordance
with US GAAP;
 
        (d) EXTENSIONS OF TIME FOR FILING TAX RETURNS. Neither the Company nor
any of its Subsidiaries has requested any extension of time within which to file
any Tax Return, which Tax Return has not since been filed;
 
        (e) WAIVERS OF STATUTE OF LIMITATIONS. Neither the Company nor any of
its Subsidiaries has executed any outstanding waivers or comparable consents
regarding the application of the statute of limitations with respect to any
Taxes or Tax Returns;
 
        (f) EXPIRATION OF STATUTE OF LIMITATIONS. The statute of limitations for
the assessment of all Taxes has expired for all applicable Tax Returns of the
Company and each of its Subsidiaries or those Tax Returns have been examined by
the appropriate taxing authorities for all periods through December 31, 1993,
and no deficiency for any Taxes has been proposed, asserted or assessed against
the Company or any of its Subsidiaries that has not been resolved and paid in
full;
 
        (g) AUDIT, ADMINISTRATIVE AND COURT PROCEEDINGS. No audits or other
administrative proceedings or court proceedings are presently pending or
threatened with regard to any Taxes or Tax Returns of the Company or any of its
Subsidiaries (other than those being contested in good faith and for which
adequate reserves have been established) and no issues have been raised in
writing by any Tax authority in connection with any Tax or Tax Return;
 
        (h) TAX LIENS. There are no Tax liens upon any asset of the Company or
any of its Subsidiaries except liens for Taxes not yet due.
 
        (i) POWERS OF ATTORNEY. No power of attorney currently in force has been
granted by the Company or any of its Subsidiaries concerning any Tax matter;
 
        (j) TAX RULINGS. Neither the Company nor any of its Subsidiaries has,
during the five year period prior to the date of this Agreement, received a Tax
Ruling (as defined below) or entered into a Closing Agreement (as defined below)
with any taxing authority. "TAX RULING", as used in this Agreement, shall mean a
written ruling of a taxing authority relating to Taxes. "CLOSING AGREEMENT", as
used in this Agreement, shall mean a written and legally binding agreement with
a taxing authority relating to Taxes;
 
        (k) AVAILABILITY OF TAX RETURNS. The Company and its Subsidiaries have
made available to Parent complete and accurate copies,` covering all years
ending on or after December 31, 1993, of (i) all United States federal Tax
Returns, and any amendments thereto, filed by the Company or any of its
Subsidiaries, (ii) all audit reports received from any taxing authority relating
to any Tax Return filed by the Company or any of its Subsidiaries and (iii) any
Closing Agreements entered into by the Company or any of its Subsidiaries with
any taxing authority. The Company and its Subsidiaries have made available to
Parent complete and accurate copies, covering all years ending on or after
December 31, 1997, of all material state Tax Returns, and any amendments
thereto, filed by the Company or any of its Subsidiaries. For purposes of this
Section 4.10(k), a "material state Tax Return" shall mean any state Tax Return
showing as due and payable a Tax of greater than or equal to $1 million.
 
                                      A-9
<PAGE>
        (l) TAX SHARING AGREEMENTS. No agreements relating to the allocation or
sharing of Taxes exist between or among the Company and any of its Subsidiaries
and neither the Company nor any of its Subsidiaries (i) has been a member of an
affiliated group filing a consolidated federal income tax return (other than a
group the comon parent of which was the Company) or (ii) has any liability for
Taxes of any Person (other than the Company or its Subsidiaries) under United
States Treasury Regulation Section 1.1502-6 (or any provision of state, local),
or foreign law, as a transferee or successor, by contract or otherwise;
 
        (m) CODE SECTION 481 ADJUSTMENTS. Neither the Company nor any of its
Subsidiaries is required to include in income any adjustment pursuant to Code
Section 481(a) by reason of a voluntary change in accounting method initiated by
the Company or any of its Subsidiaries, and, the Internal Revenue Service (the
"IRS") has not proposed any such adjustment or change in accounting method;
 
        (n) CODE SECTIONS 6661 AND 6662. All transactions that could give rise
to an understatement of federal income tax (within the meaning of Code Section
6661 for Tax Returns filed on or before December 31, 1989, and within the
meaning of Code Section 6662 for tax returns filed after December 31, 1989) have
been adequately disclosed (or, with respect to Tax Returns filed following the
Closing, will be adequately disclosed) on the Tax Returns of the Company and its
Subsidiaries in accordance with Code Section 6661(b)(2)(B) for Tax Returns filed
on or prior to December 31, 1989, and in accordance with Code Section
6662(d)(2)(B) for Tax Returns filed after December 31, 1989;
 
        (o) INTERCOMPANY TRANSACTIONS. Neither the Company nor any of its
Subsidiaries have engaged in any intercompany transactions within the meaning of
Treasury Regulations Section 1.1502-13 for which any income or gain will remain
unrecognized as of the close of the last taxable year prior to the Closing Date;
 
        (p) FOREIGN TAX RETURNS. Neither the Company nor any of its Subsidiaries
is required to file a foreign tax return; and
 
        (q) SECTION 897. To the knowledge of the Company, no person owns more
than 5% of the Company Shares.
 
    "TAXES" as used in this Agreement, shall mean any federal, state, county,
local or foreign taxes, charges, fees, levies, or other assessments, including
all net income, gross income, premiums, sales and use, ad valorem, transfer,
gains, profits, windfall profits, excise, franchise, real and personal property,
gross receipts, capital stock, production, business and occupation, employment,
disability, payroll, license, estimated, stamp, custom duties, severance or
withholding taxes, other taxes or similar charges of any kind whatsoever imposed
by any governmental entity, whether imposed directly on a Person or resulting
under Treasury Regulation Section 1.1502-6 (or any similar provision of state,
local or foreign Law), as a transferee or successor, by contract or otherwise
and includes any interest and penalties (civil or criminal) on or additions to
any such taxes or in respect of a failure to comply with any requirement
relating to any Tax Return. "TAX RETURN" as used in this Agreement, shall mean a
report, return or other information required to be supplied to a governmental
entity with respect to Taxes including, where permitted or required, combined or
consolidated returns for any group of entities.
 
    4.11 EMPLOYEE BENEFIT PLANS; ERISA. (a) Each "employee benefit plan" (as
defined in Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA")), bonus, deferred compensation, share option or other
written agreement relating to employment or fringe benefits for employees,
former employees, officers or directors of the Company or any of its
Subsidiaries effective as of the date hereof or providing benefits as of the
date hereof to current employees, former employees, officers or directors of the
Company or pursuant to which the Company or any of its subsidiaries has or could
reasonably be expected to have any liability (collectively, the "COMPANY
EMPLOYEE BENEFIT PLANS") is listed in SECTION 4.11(A) of the Company Disclosure
Letter, is in material compliance with applicable law, and has been administered
and operated in all material respects in accordance with its terms. Each Company
Employee Benefit Plan which is intended to be qualified within the meaning of
 
                                      A-10
<PAGE>
Section 401(a) of the Code has received a favorable determination letter from
the IRS as to such qualification and, to the knowledge of the Company, no event
has occurred and no condition exists which could reasonably be expected to
result in the revocation of, or have any adverse effect on, any such
determination.
 
        (b) Complete and correct copies of the following documents have been
made available to Parent as of the date of this Agreement: (i) all Company
Employee Benefit Plans and any related trust agreements or insurance contracts,
(ii) the most current summary descriptions of each Company Employee Benefit Plan
subject to ERISA, (iii) the three most recent Form 5500s and Schedules thereto
for each Company Employee Benefit Plan subject to such reporting, (iv) the three
most recent determinations of the Internal Revenue Service with respect to the
qualified status of each Company Employee Benefit Plan that is intended to
qualify under Section 401(a) of the Code, (v) the most recent accountings with
respect to each Company Employee Benefit Plan funded through a trust and (vi)
the most recent actuarial report of the qualified actuary of each Company
Employee Benefit Plan with respect to which actuarial valuations are conducted.
 
        (c) Except as set forth in SECTION 4.11(C) of the Company Disclosure
Letter, neither the Company nor any Subsidiary maintains or is obligated to
provide benefits under any Company Employee Benefit Plan (other than as an
incidental benefit under a Plan qualified under Section 401(a) of the Code)
which provides health or welfare benefits to retirees or other terminated
employees other than benefit continuations as required pursuant to Section 601
of ERISA. Each Company Employee Benefit Plan subject to the requirements of
Section 601 of ERISA has been operated in material compliance therewith. The
Company has not contributed to a nonconforming group health plan (as defined in
Code Section 5000(c)) and no person under common control with the Company within
the meaning of Section 414 of the Code ("ERISA AFFILIATE") has incurred a tax
liability under Code Section 5000(a) that is or could reasonably be expected to
be a liability of the Company's.
 
        (d) Except as set forth in SECTION 4.11(D) of the Company Disclosure
Letter, each Company Employee Benefit Plan covers only employees who are
employed by the Company or a Subsidiary (or former employees or beneficiaries
with respect to service with the Company or a Subsidiary).
 
        (e) Except as set forth in SECTION 4.11(E) of the Company Disclosure
Letter, neither the Company, any Subsidiary, any ERISA Affiliate nor any other
corporation or organization controlled by or under common control with any of
the foregoing within the meaning of Section 4001 of ERISA has, within the
five-year period preceding the date of this Agreement, at any time contributed
to any "multiemployer plan," as that term is defined in Section 4001 of ERISA.
 
        (f) No event has occurred, and there exists no condition or set of
circumstances in connection with any Company Employee Benefit Plan, under which
the Company or any Subsidiary, directly or indirectly (through any
indemnification agreement or otherwise), could be subject to any material
liability under Section 409 of ERISA, Section 502(i) of ERISA, Title IV of ERISA
or Section 4975 of the Code.
 
        (g) Neither the Company nor any ERISA Affiliate has incurred any
liability to the Pension Benefit Guaranty Corporation (the "PBGC") under Section
302(c)(ii), 4062, 4063, 4064 or 4069 of ERISA, or otherwise that has not been
satisfied in full and no event or condition exists or has existed which could
reasonably be expected to result in any such material liability. No "reportable
event" within the meaning of Section 4043 of ERISA has occurred with respect to
any Company Employee Benefit Plan that is a defined benefit plan under Section
3(35) of ERISA.
 
        (h) Except as set forth in SECTION 4.11(H) of the Company Disclosure
Letter, no employer securities, employer real property or other employer
property is included in the assets of any Company Employee Benefit Plan.
 
                                      A-11
<PAGE>
        (i) Full payment has been made of all material amounts which the Company
or any affiliate thereof was required under the terms of the Company Employee
Benefit Plans to have paid as contributions to such plans on or prior to the
Effective Time (excluding any amounts not yet due) and no Company Employee
Benefit Plan which is subject to Part III of Subtitle B of Title I of ERISA has
incurred any "accumulated funding deficiency" within the meaning of Section 302
of ERISA or Section 412 of the Code, whether or not waived.
 
        (j) Except as set forth in SECTION 4.11(J) of the Company Disclosure
Letter, no amounts payable under any Company Employee Benefit Plan or other
agreement, contract, or arrangement will fail to be deductible for federal
income tax purposes by virtue of Section 280G or Section 162(m) of the Code.
 
        4.12 LABOR MATTERS. As of the date hereof, except as set forth in
SECTION 4.12 of the Company Disclosure Letter, neither the Company nor any of
its Subsidiaries is a party to any material collective bargaining agreement or
other labor agreement with any union or labor organization. To the knowledge of
the Company, as of the date hereof, there is no current union representation
question involving employees of the Company or any of its Subsidiaries, nor does
the Company know of any activity or proceeding of any labor organization (or
representative thereof) or employee group to organize any such employees. Except
as set forth in SECTION 4.12 of the Company Disclosure Letter, (i) there is no
unfair labor practice, employment discrimination or other employment-related
complaint against the Company or any of its Subsidiaries pending or, to the
knowledge of the Company, threatened, which has or could reasonably be expected
to have a Company Material Adverse Effect, (ii) there is no strike, dispute,
slowdown, work stoppage or lockout pending, or, to the knowledge of the Company,
threatened, against or involving the Company or any of its Subsidiaries which
has or could reasonably be expected to have, a Company Material Adverse Effect
and (iii) there is no proceeding, claim, suit, or action pending or, to the
knowledge of the Company or any of its Subsidiaries, threatened, nor, to the
knowledge of the Company or any of its Subsidiaries is there any Governmental
Authority investigation pending or threatened, in respect of which any director,
officer, employee or agent of the Company or any of its Subsidiaries is or may
be entitled to claim indemnification from the Company or any of its Subsidiaries
pursuant to the Trust Agreement, in the case of the Company, and their
respective articles of incorporation and by-laws, in the case of the Company's
Subsidiaries, or as provided in the indemnification agreements listed in SECTION
4.12 of the Company Disclosure Letter. Except as set forth in SECTION 4.12 of
the Company Disclosure Letter, the Company and its Subsidiaries are in
compliance with all Federal, State and local laws with respect to employment
practices, labor relations, safety and health regulations and mass layoffs and
plant closings except for such instances of noncompliance which, individually or
in the aggregate, could not reasonably be expected to have a Company Material
Adverse Effect.
 
    4.13 ENVIRONMENTAL MATTERS. Except as disclosed in the Company SEC Reports
filed prior to the date of this Agreement or in SECTION 4.13 of the Company
Disclosure Letter:
 
        (a) (i) Each of the Company and its Subsidiaries is in compliance with
all applicable Environmental Laws (as hereinafter defined), except where the
failure to be in compliance, in the aggregate could not reasonably be expected
to result in a Company Material Adverse Effect; and
 
           (ii) Neither the Company nor any of its Subsidiaries has received any
written communication from any person or Governmental Authority that alleges
that the Company or any of its Subsidiaries is not in such compliance (including
the materiality qualifier set forth in clause (i) above) with applicable
Environmental Laws.
 
        (b) Each of the Company and its Subsidiaries has obtained all
environmental, health and safety permits and governmental authorizations
(collectively, the "ENVIRONMENTAL PERMITS") necessary for the construction of
their facilities and the conduct of their operations, as applicable, and all
such Environmental Permits are in good standing or, where applicable, a renewal
application has been timely
 
                                      A-12
<PAGE>
filed and agency approval is expected in the ordinary course of business, and
the Company and its Subsidiaries are in compliance with all terms and conditions
of the Environmental Permits, except where the failure have such Environmental
Permits, file a renewal application for such Environmental Permits, or to be in
compliance with such Environmental Permits, in the aggregate could not
reasonably be expected to result in a Company Material Adverse Effect.
 
        (c) There is no Environmental Claim (as hereinafter defined) that could,
individually or in the aggregate, reasonably be expected to have a Company
Material Adverse Effect pending (i) against the Company or any of its
Subsidiaries; (ii) against any person or entity whose liability for any
Environmental Claim the Company or any of its Subsidiaries has or may have
retained or assumed either contractually or by operation of law; or (iii)
against any real or personal property or operations which the Company or any of
its Subsidiaries owns, leases or manages, in whole or in part.
 
        (d) To the knowledge of the Company there have not been any material
Releases (as hereinafter defined) of any Hazardous Material (as hereinafter
defined) that would be reasonably likely to form the basis of any material
Environmental Claim against the Company or any of its Subsidiaries, or against
any person or entity whose liability for any material Environmental Claim the
Company or any of its Subsidiaries has or may have retained or assumed either
contractually or by operation of law, except for any Environmental Claim that,
individually or in the aggregate, could not reasonably be expected to have a
Company Material Adverse Effect.
 
        (e) To the knowledge of the Company with respect to any predecessor of
the Company or any of its Subsidiaries, there is no material Environmental Claim
pending or threatened, and there has been no Release of Hazardous Materials that
could reasonably be expected to form the basis of any material Environmental
Claim except for any Environmental Claim that, individually or in the aggregate,
could not be reasonably be expected to have a Company Material Adverse Effect.
 
        (f) As used in this Section 4.13:
 
          (i) "ENVIRONMENTAL CLAIM" means any and all written administrative,
regulatory or judicial actions, suits, demands, demand letters, directives,
claims, liens, investigations, proceedings or notices or noncompliance,
liability or violation by any person or entity (including any Governmental
Authority) alleging potential liability (including, without limitation,
potential responsibility or liability for enforcement, investigatory costs,
cleanup costs, governmental response costs, removal costs, remedial costs,
natural resources damages, property damages, personal injuries or penalties)
arising out of, based on or resulting from
 
          (A) the presence, or Release or threatened Release into the
environment, of any Hazardous Materials at any location, whether or not owned,
operated, leased or managed by the Company or any of its Subsidiaries; or
 
          (B) circumstances forming the basis of any violation, or alleged
violation, of any Environmental Law; or
 
          (C) any and all claims by any third party seeking damages,
contribution, indemnification, cost recovery, compensation or injunctive relief
resulting from the presence or Release of any Hazardous Materials;
 
          (ii) "ENVIRONMENTAL LAWS" means all Federal, state and local laws,
rules and regulations and binding interpretation thereof, relating to pollution,
the environment (including, without limitation, ambient air, surface water,
groundwater, land surface or subsurface strata) or protection of human health as
it relates to the environment including, without limitation, laws and
regulations relating to Releases or threatened Releases of Hazardous Materials,
or otherwise relating to the manufacture, generation, processing, distribution,
use, treatment, storage, disposal, transport or handling of Hazardous Materials;
 
                                      A-13
<PAGE>
          (iii) "HAZARDOUS MATERIALS" means (A) any petroleum or petroleum
products, radioactive materials, asbestos in any form that is or could become
friable, urea formaldehyde foam insulation, and transformers or other equipment
that contain dielectric fluid containing polychlorinated biphenyls; and (B) any
chemicals, materials or substances which are now defined as or included in the
definition of "HAZARDOUS SUBSTANCES", "HAZARDOUS WASTES", "HAZARDOUS MATERIALS",
"EXTREMELY HAZARDOUS WASTES", "RESTRICTED HAZARDOUS WASTES", "TOXIC SUBSTANCES",
"TOXIC POLLUTANTS", or words of similar import, under any Environmental Law; and
(c) any other chemical, material, substance or waste, exposure to which is now
prohibited, limited or regulated under any Environmental Law in a jurisdiction
in which the Company or any of its Subsidiaries(x) operates or (y) stores,
treats or disposes of Hazardous Materials; and
 
          (iv) "RELEASE" means any release, spill, emission, leaking, injection,
deposit, disposal, discharge, dispersal, leaching or migration into the
atmosphere, soil, surface water, groundwater or property.
 
    4.14 REGULATION AS A UTILITY. (a) The Company is a public utility holding
company registered under Section 5, and subject to the provisions, of the 1935
Act. SECTION 4.14 of the Company Disclosure Letter lists the subsidiaries of the
Company that are "PUBLIC UTILITY COMPANIES" within the meaning of Section
2(a)(5) of the 1935 Act and lists the jurisdictions where each such Subsidiary
is subject to regulation as a public utility company or public service company.
Except as set forth above and as set forth in SECTION 4.14 of the Company
Disclosure Letter, neither the Company nor any "SUBSIDIARY COMPANY" or
"AFFILIATE" of the Company is subject to regulation as a public utility or
public service company (or similar designation) by the Federal government of the
United States, any state in the United States or any political subdivision
thereof, or any foreign country.
 
          (b) As used in this SECTION 4.14, the terms "SUBSIDIARY COMPANY" and
"AFFILIATE" shall have the respective meanings ascribed to them in SECTION
2(A)(8) and SECTION 2(A)(11), respectively, of the 1935 Act.
 
    4.15 INSURANCE. Except as set forth in SECTION 4.15 of the Company
Disclosure Letter, each of the Company and its Subsidiaries is, and has been
continuously since January 1, 1994, insured with financially responsible
insurers in such amounts and against such risks and losses as are customary in
all material respects for companies in the United States conducting the business
conducted by the Company and its Subsidiaries during such time period. Except as
set forth in SECTION 4.15 of the Company Disclosure Letter, neither the Company
nor any of its Subsidiaries has received any notice of cancellation or
termination with respect to any material insurance policy of the Company or any
of its Subsidiaries. The insurance policies of the Company and each of its
Subsidiaries are valid and enforceable policies.
 
    4.16 NUCLEAR FACILITIES. One of the Subsidiaries of the Company is a
minority common stockholder of each of Connecticut Yankee Atomic Power Company,
Maine Yankee Atomic Power Company, Vermont Yankee Nuclear Power Company and
Yankee Atomic Electric Company (the "YANKEE COMPANIES") and a minority joint
owner in Millstone 3 and Seabrook 1 (collectively, as described in SECTION 4.16
of the Company Disclosure Letter, the "COMPANY NUCLEAR FACILITIES"). With
respect to its ownership of Millstone 3 and Seabrook 1, the Company's Subsidiary
holds the required operating licenses from the NRC. With respect to the Yankee
Companies, each Yankee Company holds its own operating license from the NRC.
Because it is a minority stockholder or a minority joint owner, the Company's
Subsidiary does not have responsibility for the operation of the Company Nuclear
Facilities. Except as set forth in SECTION 4.16 of the Company Disclosure Letter
or as disclosed in the Company SEC Reports filed prior to the date hereof, to
the knowledge of the Company, neither the Company nor any of its Subsidiaries is
in violation of any applicable health, safety, regulatory and other legal
requirement, including NRC laws and regulations and Environmental Laws,
applicable to the Company Nuclear Facilities except for such failure to comply
as could not reasonably be expected to have a material adverse effect with
respect to the Company Nuclear Facilities and the ownership interest of the
Company therein. To the knowledge of the Company, each of the Company Nuclear
Facilities
 
                                      A-14
<PAGE>
maintains emergency plans designed to respond to an unplanned release therefrom
of radioactive materials into the environment and insurance coverages consistent
with industry practice. The Company has funded, or has caused the funding of,
its portion of the decommissioning cost of each of the Company Nuclear
Facilities and the storage of spent nuclear fuel consistent with the most
recently approved plan for each of the Company Nuclear Facilities and FERC
authorized rates. Except as set forth in SECTION 4.16 of the Company Disclosure
Letter, to the knowledge of the Company, no Company Nuclear Facility is as of
the date of this Agreement on the List of Nuclear Power Plants Warranting
Increased Regulatory Attention maintained by the NRC.
 
    4.17 VOTE REQUIRED. The affirmative vote of a majority of the outstanding
Company Shares voting as a single class (with each Company Share having one vote
per share) with respect to the approval of the Merger and other transactions
contemplated hereby is the only vote of the holders of any class or series of
equity securities of the Company or its Subsidiaries required to approve this
Agreement and approve the Merger and other transactions contemplated hereby.
 
    4.18 OPINION OF FINANCIAL ADVISOR. The Company has received the opinion of
Merrill, Lynch, Pierce, Fenner & Smith Incorporated, dated the date hereof, to
the effect that, as of the date hereof, the consideration to be received by the
Shareholders of the Company in the Merger is fair from a financial point of view
to the Shareholders of the Company, and a true and complete copy of such opinion
has been delivered to Parent prior to the execution of this Agreement.
 
    4.19 OWNERSHIP OF PARENT ORDINARY SHARES. Neither the Company nor any of its
Subsidiaries or other affiliates beneficially owns any Parent Ordinary Shares or
American Depositary Shares of Parent, each representing ten (10) Parent Ordinary
Shares.
 
    4.20 STATE ANTI-TAKEOVER STATUTES. The Company has taken all necessary
actions so that the provisions of Chapters 110C, 110D or 110F of the MGL and the
provisions of Article 59A of the Company's Trust Agreement will not apply to
this Agreement, the Merger or other transactions contemplated hereby or thereby.
 
    4.21 YEAR 2000. The computer software operated by the Company and its
Subsidiaries which is used in the conduct of their business is capable of
providing or being adapted to provide uninterrupted millennium functionality to
record, store, process and present calendar dates falling on or after January 1,
2000 in substantially the same manner and with the same functionality as such
software records, stores, processes and presents such calendar dates falling on
or before December 31, 1999 other than such interruptions in millenium
functionality that could not, individually or in the aggregate, reasonably be
expected to result in a Company Material Adverse Effect. The Company reasonably
believes as of the date hereof that the remaining cost of adaptions referred to
in the foregoing sentence will not exceed the amounts reflected in the Form 10-Q
filed by the Company for the quarter ended September 30, 1998.
 
    4.22 COMPANY ASSOCIATES. The representations and warranties set forth in
SECTIONS 4.04(A), 4.06, 4.07, 4.09, 4.12 and 4.13 are true and correct in all
material respects with regard to the Company Associates.
 
                                      A-15
<PAGE>
                                   ARTICLE V
                REPRESENTATIONS AND WARRANTIES OF PARENT AND LLC
 
    Parent and LLC represent and warrant to the Company as follows:
 
    5.01  ORGANIZATION AND QUALIFICATION.  (a) Each of Parent and its
Subsidiaries (other than LLC) is a corporation duly incorporated or organized,
validly existing and in good standing (with respect to jurisdictions which
recognize the concept of good standing) under the laws of its jurisdiction of
incorporation or organization and has full corporate power and authority to
conduct its business as and to the extent now conducted and to own, use and
lease its assets and properties, except for where failure to be so incorporated,
existing and in good standing (with respect to jurisdictions which recognize the
concept of good standing) or to have such power and authority, individually or
in the aggregate, could not reasonably be expected to have a Parent Material
Adverse Effect. As used in this agreement, the term "PARENT MATERIAL ADVERSE
EFFECT" means a material adverse effect on the business, assets, results of
operations, condition (financial or otherwise) or prospects of Parent and its
Subsidiaries taken as a whole. LLC is a limited liability company validly
existing under the laws of the Commonwealth of Massachusetts. LLC was formed
solely for the purpose of engaging in the Merger and other transactions
contemplated hereby, has engaged in no other business activities (other than in
connection with the formation and capitalization of LLC pursuant to or in
accordance with the LLC Agreement (as defined below)) and has conducted its
operations only as contemplated hereby and by the LLC Agreement. Each of Parent
and The National Grid Company Plc ("NGC") is duly qualified, licensed or
admitted to do business in each jurisdiction in which the ownership, use or
leasing of its assets and properties, or the conduct or nature of its business,
makes such qualification, licensing, admission or good standing necessary,
except where failure to be so qualified, licensed or admitted, individually or
in the aggregate, could not reasonably be expected to have a Parent Material
Adverse Effect. Parent has previously delivered to the Company correct and
complete copies of the memorandum and articles of association (or other
comparable charter documents) of Parent and NGC, and the Operating Agreement of
LLC (the "LLC AGREEMENT") and has attached to such documents copies of all
resolutions and other documents required to be so attached.
 
    5.02  SHARE CAPITAL.  (a) The authorized share capital of Parent consists
solely of (i) 2,125 million ordinary shares of 11 13/17 pence each of Parent
(each a "PARENT ORDINARY SHARE"), of which 1,474.4 million shares were in issue
as of March 31, 1998 and (ii) one Special Rights Redeemable Preference Share of
L1 (the "SPECIAL SHARE"), which was in issue as of such date. Since March 31,
1998, except as disclosed in the forms, reports, schedules, circulars and other
filings with the LSE made by Parent pursuant to its continuing obligations under
LSE rules and regulations (the "PARENT REPORTS") filed prior to the date of this
Agreement or SECTION 5.02 of the letter dated the date hereof and delivered by
Parent and LLC to the Company concurrently with the execution and delivery of
this Agreement (the "PARENT DISCLOSURE LETTER"), there has been no change in the
number of issued Parent Ordinary Shares other than the issuance of Parent
Ordinary Shares pursuant to options or rights outstanding as of such date to
subscribe or purchase Parent Ordinary Shares. All of the issued Parent Ordinary
Shares are duly authorized, validly issued and fully paid, and no Parent
Ordinary Share is entitled to preemptive rights, except as provided in Section
89 of the Companies Act 1985, as amended (the "Companies Act"). Except pursuant
to this Agreement, and except as disclosed in SECTION 5.02 of the Parent
Disclosure Letter, on the date hereof there are no outstanding Options
obligating Parent or any of its Subsidiaries to issue or sell any Parent
Ordinary Shares or to grant, extend or enter into any Option with respect
thereto.
 
    (b) Except as disclosed in the Parent Reports filed prior to the date of
this Agreement or SECTION 5.02 of the Parent Disclosure Letter, all of the
outstanding shares of NGC are duly authorized, validly issued, fully paid and
are owned, beneficially and of record, by Parent or a Subsidiary, which is
wholly owned, directly or indirectly, by Parent, free and clear of any Liens.
Except as disclosed in the Parent Reports filed prior to the date of this
Agreement or SECTION 5.02 of the Parent Disclosure
 
                                      A-16
<PAGE>
Letter, there are no (i) outstanding Options obligating Parent or NGC to issue
or sell any shares of NGC or to grant, extend or enter into any such Option or
(ii) voting trusts, proxies or other commitments, understandings, restrictions
or arrangements in favor of any person other than Parent or a Subsidiary, which
is wholly owned, directly or indirectly, by Parent, with respect to the voting
of or the right to participate in dividends or other earnings in respect of any
shares of NGC.
 
    (c) Except as disclosed in the Parent Reports filed prior to the date of
this Agreement or SECTION 5.02 of the Parent Disclosure Letter and except for
the right of the holder of the Special Share to require Parent to redeem the
Special Share pursuant to the Articles of Association of Parent, there are no
outstanding contractual obligations of Parent or any of its Subsidiaries to
repurchase, redeem or otherwise acquire any Parent Ordinary Shares or any shares
of NGC or to provide funds to, or make any investment (in the form of a loan,
capital contribution or otherwise) in, NGC or any other person.
 
    (d) Except as disclosed in the Parent Disclosure Letter, as of the date of
this Agreement, no bonds, debentures, notes or other indebtedness of Parent or
any of its Subsidiaries having the right to vote (or which are convertible into
or exercisable for securities having the right to vote) (together, "PARENT
VOTING DEBT") on any matters on which Parent Shareholders may vote are issued or
are outstanding nor are there any outstanding Options obligating Parent or any
of its Subsidiaries to issue or sell any Parent Voting Debt or to grant, extend
or enter into any Option with respect thereto.
 
    5.03  AUTHORITY.  Each of Parent and LLC has full power and authority to
enter into this Agreement, and, subject (in the case of this Agreement) to
obtaining the Parent Shareholders' Approval (as defined in SECTION 7.03(A)), to
perform its obligations hereunder, and to consummate the Merger and other
transactions contemplated hereby. The execution, delivery and performance of
this Agreement by each of Parent and LLC and the consummation by each of Parent
and LLC of the Merger and other transactions contemplated hereby have been duly
authorized by all necessary corporate action on the part of Parent and all
necessary action on the part of LLC, subject to obtaining the Parent
Shareholders' Approval. This Agreement has been duly and validly executed and
delivered by each of Parent and LLC and constitutes a legal, valid and binding
obligation of each of Parent and LLC enforceable against each of Parent and LLC
in accordance with its terms, except as enforceability may be limited by
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting the enforcement of creditors' rights generally and by general
equitable principles (regardless of whether such enforceability is considered in
a proceeding in equity or at law).
 
    5.04  NON-CONTRAVENTION; APPROVALS AND CONSENTS.  (a) The execution and
delivery of this Agreement by each of Parent and LLC do not, and the performance
by each of Parent and LLC of its obligations hereunder and the consummation of
the Merger and other transactions contemplated hereby will not, conflict with,
result in a violation or breach of, constitute (with or without notice or lapse
of time or both) a default under, result in or give to any person any right of
payment or reimbursement, termination, cancellation, modification or
acceleration of, or result in the creation or imposition of any Lien upon any of
the assets or properties of Parent, LLC or NGC under, any of the terms,
conditions or provisions of (i) the memorandum and articles of association (or
other comparable charter documents) of Parent, LLC or NGC, (ii) the LLC
Agreement; or (iii) subject to the obtaining of the Parent Shareholders'
Approval and the taking of any other actions described in paragraph (b) of this
Section, (x) any laws or orders of any Governmental Authority applicable to
Parent, LLC or NGC or any of their respective assets or properties, or (y)
subject to obtaining the third-party consents set forth in SECTION 5.04 of the
Parent Disclosure Letter (the "PARENT REQUIRED CONSENTS") any Contracts to which
Parent, LLC or NGC is a party or by which Parent or any of its Subsidiaries or
any of their respective assets or properties is bound, excluding from the
foregoing clauses (x) and (y) conflicts, violations, breaches, defaults,
terminations, modifications, accelerations and creations and impositions of
Liens which, individually or in the aggregate, could not reasonably be expected
to have a Parent Material Adverse Effect.
 
                                      A-17
<PAGE>
    (b) No declaration, filing or registration with, or notice to or
authorization, consent or approval of, any Governmental Authority is necessary
for the execution and delivery of this Agreement by Parent or LLC or the
consummation by Parent or LLC of the Merger and other transactions contemplated
hereby except as described in SECTION 5.04 of the Parent Disclosure Letter or
the failure of which to obtain could not reasonably be expected to result in a
Parent Material Adverse Effect (the "PARENT REQUIRED STATUTORY APPROVALS," it
being understood that references in this Agreement to "obtaining" such Parent
Required Statutory Approvals shall mean making such declarations, filings or
registrations; giving such notices; obtaining such authorizations, consents or
approvals; and having such waiting periods expire as are necessary to avoid a
violation of law).
 
    5.05  INFORMATION SUPPLIED.  (a) The Circular will, at all relevant times,
include all information relating to Parent, and information which is within the
knowledge of each of the directors of Parent (or which it would be reasonable
for them to obtain by making enquiries), which, in each case, is required to
enable the Circular and the parties hereto to comply in all material respects
with all United Kingdom statutory and other legal and regulatory provisions
(including, without limitation, the Companies Act, the Financial Services Act
1986, as amended, and the rules and regulations made thereunder, and the rules
and requirements of the LSE) and all such information contained in the Circular
will be in accordance with the facts and will not omit anything likely to affect
the import of such information.
 
    (b) The information supplied by Parent or LLC and included in the Proxy
Statement with the written consent of Parent or LLC, as the case may be, will
not, at the date mailed to the Company's Shareholders or at the time of the
Company Shareholder's Meeting, contain any untrue statements of a material fact
or omit to state any material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading.
 
    (c) Notwithstanding the foregoing provisions of this SECTION 5.05, no
representation or warranty is made by Parent with respect to statements made or
incorporated by reference in the Proxy Statement or the Circular based on
information supplied by the Company for inclusion or incorporation by reference
therein or based on information which is not made in or incorporated by
reference in such documents but which should have been disclosed pursuant to
this SECTION 5.05.
 
    5.06  COMPLIANCE.  Except as set forth in SECTION 5.06 of the Parent
Disclosure Letter, or as disclosed in the Parent Reports filed prior to the date
hereof, neither the Parent nor NGC is in violation of, is, to the knowledge of
the Parent, under investigation with respect to any violation of, or has been
given notice or been charged with any violation of, any law, statute, order,
rule, regulation, ordinance or judgment (including, without limitation, any
applicable environmental law, ordinance or regulation) of any Governmental
Authority, except for possible violations which, individually or in the
aggregate, could not reasonably be expected to have a Parent Material Adverse
Effect. Except as set forth in SECTION 5.06 of the Parent Disclosure Letter or
as disclosed in the Parent Reports filed prior to the date hereof, Parent and
NGC have all material permits, licenses and other governmental authorizations,
consents and approvals necessary to conduct their businesses as presently
conducted which are material to the operation of the businesses of the Parent
and NGC. Neither the Parent nor NGC is in breach or violation of, or in default
in the performance or observance of, any term or provision of, and no event has
occurred which, with lapse of time or action by a third party, could result in a
default by Parent or NGC under (i) its articles or memorandum of association or
by-laws or (ii) any contract, commitment, agreement, indenture, mortgage, loan
agreement, note, lease, bond, license, approval or other instrument to which it
is a party or by which Parent or NGC is bound or to which any of their
respective property is subject, except for possible violations, breaches or
defaults which, individually or in the aggregate, could not reasonably be
expected to have a Parent Material Adverse Effect.
 
    5.07  FINANCING.  Parent has or will have available, prior to the Effective
Time, sufficient cash in immediately available funds to pay or to cause LLC to
pay the Merger Consideration pursuant to Article II hereof and to consummate the
Merger and other transactions contemplated hereby.
 
                                      A-18
<PAGE>
    5.08  VOTE REQUIRED.  The only votes of the holders of any class of shares
of Parent that are required to approve the Merger and other transactions
contemplated thereby are the affirmative vote of a majority of such ordinary
Shareholders of Parent as (being entitled to do so) are present in person and
vote (or, in the case of a vote taken on a poll, the affirmative vote by
Shareholders representing a majority of the Parent Ordinary Shares in respect of
which votes were validly exercised) at the Parent Shareholders' Meeting in
relation to the Merger and other transactions contemplated hereby.
 
    5.09  OWNERSHIP OF COMPANY SHARES.  Neither Parent nor any of its
Subsidiaries or other affiliates beneficially owns any Company Shares.
 
                                   ARTICLE VI
                                   COVENANTS
 
    6.01  COVENANTS OF THE COMPANY.  At all times from and after the date hereof
until the Effective Time, the Company covenants and agrees as to itself and its
Subsidiaries that (except as expressly contemplated or permitted by this
Agreement or as set forth in SECTION 6.01 of the Company Disclosure Letter, or
to the extent that Parent shall otherwise previously consent in writing):
 
    (a) ORDINARY COURSE. The Company and each of its Subsidiaries shall conduct
their businesses only in, and the Company and each of its Subsidiaries shall not
take any action except in the ordinary course consistent with good utility
practice. Without limiting the generality of the foregoing, the Company and its
Subsidiaries shall use all commercially reasonable efforts to preserve intact in
all material respects their present business organizations and reputation, to
maintain in effect all existing permits, to keep available the services of their
key officers and employees, to maintain their assets and properties in good
working order and condition, ordinary wear and tear excepted, to maintain
insurance on their tangible assets and businesses in such amounts and against
such risks and losses as are currently in effect, to preserve their
relationships with customers and suppliers and others having significant
business dealings with them and to comply in all material respects with all laws
and orders of all Governmental Authorities applicable to them.
 
    (b) CHARTER DOCUMENTS. The Company shall not, nor shall it permit any of its
Subsidiaries to amend or propose to amend the Trust Agreement, in the case of
the Company, and its certificate or articles of incorporation or organization or
bylaws (or other comparable charter documents), in the case of the Company's
Subsidiaries.
 
    (c) DIVIDENDS. The Company shall not, nor shall it permit any of its
Subsidiaries to, (i) declare, set aside or pay any dividends on or make other
distributions in respect of any of its capital stock or share capital, except:
 
    (A) that the Company may continue the declaration and payment of regular
       quarterly dividends on Company Shares with usual record and payment dates
       not, in any fiscal year, in excess of the dividend for the comparable
       period in the prior fiscal year;
 
    (B) a special dividend on the Company Shares with respect to the quarter in
       which the Effective Time occurs with a record date on or prior to the
       date on which the Effective Time occurs, which does not exceed an amount
       equal to $.59 multiplied by a fraction, the numerator of which is the
       number of days in such quarter prior to the date on which the Effective
       Time occurs, and the denominator of which is the total number of days in
       such fiscal quarter; and
 
    (C) for dividends and distributions (including liquidating distributions) by
       a direct or indirect Subsidiary of the Company to its parent,
 
(ii) split, combine, subdivide, reclassify or take similar action with respect
to any of its capital stock or share capital or issue or authorize or propose
the issuance of any other securities in respect of, in lieu of or in
substitution for shares of its capital stock or comprised in its share capital,
(iii) adopt a plan of
 
                                      A-19
<PAGE>
complete or partial liquidation or resolutions providing for or authorizing such
liquidation or a dissolution, merger, consolidation, restructuring,
recapitalization or other reorganization or (iv) directly or indirectly redeem,
repurchase or otherwise acquire any shares of its capital stock or comprised in
its share capital or any Option with respect thereto except:
 
    (A) in connection with intercompany purchases of capital stock or share
       capital,
 
    (B) for the purpose of funding the Company Share Plans or dividend
       reinvestment and share purchase plan in accordance with past practice, or
 
    (C) subject to the Company's obligations under the Securities Act and the
       Exchange Act, pursuant to the Company's previously announced share
       repurchase program.
 
    (d) SHARE ISSUANCES. The Company shall not, nor shall it permit any of its
Subsidiaries to issue, deliver or sell, or authorize or propose the issuance,
delivery or sale of, any shares of its capital stock or any Option with respect
thereto (other than (i) the issuance of Company Shares or share appreciation,
share awards or similar rights, as the case may be, pursuant to the Company
Share Plans, in each case outstanding on the date of this Agreement and in
accordance with their present terms, (ii) the issuance of options or awards
pursuant to the Company Share Plans in accordance with their present terms and
only in connection with the hiring of new employees, and the issuance of Company
Shares upon exercise of such options or awards or (iii) the issuance by a wholly
owned Subsidiary of its capital stock to its direct or indirect parent
corporation, or modify or amend any right of any holder of outstanding shares of
capital stock or Options with respect thereto).
 
    (e) ACQUISITIONS. The Company shall not, nor shall it permit any of its
Subsidiaries to acquire (by merging or consolidating with, or by purchasing a
substantial equity interest in or substantial portion of the assets of, or by
any other manner) any business or any corporation, partnership, association or
other business organization or division thereof or otherwise acquire or agree to
acquire any assets other than in the ordinary course of its business consistent
with past practice and having an aggregate value of less than $7,500,000 for any
one acquisition or $50,000,000 in the aggregate through December 31, 1999 and,
if the Effective Time has not occurred on or prior to December 31, 1999,
$75,000,000 in the aggregate.
 
    (f) DISPOSITIONS. The Company shall not, nor shall it permit any of its
Subsidiaries to sell, lease, securitize, grant any security interest in or
otherwise dispose of or encumber any of its assets or properties, other than
dispositions in the ordinary course of its business consistent with past
practice and having an aggregate value of less than $5,000,000 for each
disposition and $20,000,000 in the aggregate.
 
    (g) INDEBTEDNESS. The Company shall not, nor shall it permit any of its
Subsidiaries to incur or guarantee any indebtedness (including any debt borrowed
or guaranteed or otherwise assumed, including, without limitation, the issuance
of debt securities or warrants or rights to acquire debt) or enter into any
"keep well" or other agreement to maintain any financial condition of another
Person or enter into any arrangement having the economic effect of any of the
foregoing other than (i) short-term indebtedness in the ordinary course of
business consistent with past practice (such as the issuance of commercial paper
or the use of existing credit facilities) in amounts not exceeding the amounts
set forth in Section 6.01(g) of the Company Disclosure Letter, (ii) long-term
indebtedness in connection with the refinancing of existing indebtedness either
at its stated maturity or at a lower cost of funds (calculating such cost on an
aggregate after-tax basis) or (iii) guarantees or "keep well" agreements in
favor of wholly owned Subsidiaries of the Company in connection with the conduct
of the business of such wholly owned Subsidiaries of the Company not aggregating
more than $15 million.
 
    (h) CAPITAL EXPENDITURES. Except (i) as required by law or (ii) as
reasonably deemed necessary by the Company after consulting with Parent
following a catastrophic event, such as a major storm, the Company shall not,
nor shall it permit any of its Subsidiaries to make any capital expenditures or
 
                                      A-20
<PAGE>
commitments during any fiscal year that is in excess of 110% of (i) the
aggregate amount set forth in SECTION 6.01(H) of the Company Disclosure Letter
with respect to the Company and its Subsidiaries that are public utility
companies within the meaning of Section 2(a)(5) of the 1935 Act or (ii) the
amount set forth in Section 6.01(h) of the Company Disclosure Letter with
respect to each of the Company's other Subsidiaries.
 
    (i) EMPLOYEE BENEFITS AND LABOR MATTERS. The Company shall not, nor shall it
permit any of its Subsidiaries to enter into, adopt, amend in any material
manner (except as may be required by applicable law) or terminate any Company
Employee Benefit Plan, or other agreement, arrangement, plan or policy between
the Company or one of its Subsidiaries and one or more of its directors,
officers, employees or former employees, or, except for normal increases in the
ordinary course of business, (a) increase in any manner the compensation or
fringe benefits of any director or executive officer, (b) increase in any manner
the compensation or fringe benefits of any employee, (c) pay any benefit not
required by any plan or arrangement in effect as of the date hereof or, (d)
cause any director, officer, employee or former employee of the Company to
accrue or receive additional benefits, accelerate vesting or accelerate the
payment of any benefits under any Company Employee Benefit Plan, or other
agreement, arrangement, plan or policy. Notwithstanding the foregoing, nothing
in this SECTION 6.01(I) shall prevent the Company from (1) entering into
employment or consulting agreements or arrangements in the ordinary course of
business consistent with past practice or severance agreements intended solely
to implement the terms of severance policies or programs in effect on the date
hereof, (2) entering into any retention arrangements with employees who are not
senior executive officers (as determined by the Company) that, in the aggregate,
will not require the Company to make payments in excess of $5,000,000 or (3)
amending the Rabbi Trust to require annual funding thereunder of an amount
necessary to cause the fair market value of the assets held under the Rabbi
Trust to be equal to accumulated benefit obligations under the Plans (as defined
in the Rabbi Trust). The Company, prior to the Closing Date, shall take all
necessary actions, so that on or after the Closing Date, neither the Company,
the Surviving Entity nor their affiliates' stock or securities will be required
to be held in, or distributed pursuant to, any Company Employee Benefit Plan.
Notwithstanding any other provision of this Agreement to the contrary, the
Company or its Subsidiaries may negotiate successor collective bargaining
agreements to those referenced in SECTION 4.12 hereof, and may negotiate other
collective bargaining agreements or arrangements as required by law or for the
purpose of implementing the agreements referenced in SECTION 4.12 hereof. The
Company will keep Parent informed as to, and will consult with Parent as to the
strategy for, all negotiations with collective bargaining representatives.
 
    (j) DISCHARGE OF LIABILITIES. The Company shall not, nor shall it permit its
Subsidiaries to, pay, discharge or satisfy any material claims, liabilities or
obligations (absolute accrued, asserted or unasserted, contingent or otherwise),
other than the payment, discharge or satisfaction, in the ordinary course of
business consistent with past practice (which includes the payment of final and
unappealable judgments) or in accordance with their terms, of liabilities
reflected or reserved against in, or contemplated by, the most recent
consolidated financial statements (or the notes thereto) of such party included
in the Company SEC Reports, or incurred in the ordinary course of business
consistent with past practice.
 
    (k) CONTRACTS. The Company shall not, nor shall it permit its Subsidiaries,
except in the ordinary course of business consistent with past practice (i) to
modify, amend, terminate or fail to use commercially reasonable efforts to renew
any material Contract to which the Company or any of its Subsidiaries is a party
or waive, release or assign any material rights or claims or (ii) to enter into
any new material Contracts except as expressly permitted by SECTIONS 6.01(I) AND
7.06 hereof.
 
    (l) INSURANCE. The Company shall, and shall cause its Subsidiaries to,
maintain with financially responsible insurance companies (or through
self-insurance, consistent with past practice) insurance in such amounts and
against such risks and losses as are customary for companies engaged in their
respective businesses.
 
                                      A-21
<PAGE>
    (m) 1935 ACT. The Company shall not, nor shall it permit any of its
Subsidiaries to, engage in any activities which would cause a change in its
status, or that of its Subsidiaries, under the 1935 Act.
 
    (n) REGULATORY MATTERS. Subject to applicable law and except for
non-material filings in the ordinary course of business consistent with past
practice, the Company shall consult with Parent prior to implementing any
changes in its or any of its Subsidiaries' rates or charges, standards of
service or accounting or executing any agreement with respect thereto that is
otherwise permitted under this Agreement and shall, and shall cause its
Subsidiaries to, deliver to Parent a copy of each such filing or agreement at
least four (4) business days prior to the filing or execution thereof so that
Parent may comment thereon. The Company shall, and shall cause its Subsidiaries
to, make all such filings (i) only in the ordinary course of business consistent
with past practice or (ii) as required by a Governmental Authority or regulatory
agency with appropriate jurisdiction.
 
    (o) ACCOUNTING. The Company shall not, nor shall it permit any of its
Subsidiaries to make any changes in their accounting methods, policies or
procedures, except as required by law, rule, regulation or applicable generally
accepted accounting principles;
 
    (p) TAX STATUS. Neither the Company nor any of its Subsidiaries shall (i)
make or rescind any material express or deemed election relating to Taxes, (ii)
make a request for a Tax Ruling or enter into a Closing Agreement, (iii) settle
or compromise any material claim, action, suit, litigation, proceeding,
arbitration, investigation, audit, or controversy relating to Taxes or (iv)
change in any material respect any of its methods of reporting income,
deductions or accounting for federal income tax purposes from those employed in
the preparation of its federal income Tax Return for the taxable year ending
December 31, 1997, except as may be required by applicable law; PROVIDED,
however that with respect to any consent required by reason of this SECTION
6.01(P)(II) OR (III) to be obtained by the Company, such consent shall not be
unreasonably withheld by Parent.
 
    (q) NO BREACH. The Company shall not, nor shall it permit any of its
Subsidiaries to willfully take or fail to take any action that would or is
reasonably likely to result in (i) a material breach of any provision of this
Agreement or (ii) its representations and warranties set forth in this Agreement
being untrue in any material respect on and as of the Closing Date.
 
    (r) ADVICE OF CHANGES. The Company shall confer with Parent on a regular and
frequent basis with respect to the Company's business and operations and other
matters relevant to the Merger, and shall promptly advise Parent, orally and in
writing, of any material change or event, including, without limitation, any
complaint, investigation or hearing by any Governmental Authority (or
communication indicating the same may be contemplated) or the institution or
threat of material litigation; PROVIDED that the Company shall not be required
to make any disclosure to the extent such disclosure would constitute a
violation of any applicable law or regulation.
 
    (s) NOTICE AND CURE. The Company will notify Parent in writing of, and will
use all commercially reasonable efforts to cure before the Closing, any event,
transaction or circumstance, as soon as practical after it becomes known to the
Company, that causes or will or may be likely to cause any covenant or agreement
of the Company under this Agreement to be breached or that renders or will
render untrue in any material respect any representation or warranty of the
Company contained in this Agreement. The Company also will notify the Parent in
writing of, and will use all commercially reasonable efforts to cure, before the
Closing, any material violation or breach, as soon as practical after it becomes
known to the Company, of any representation, warranty, covenant or agreement
made by the Company. No notice given pursuant to this paragraph shall have any
effect on the representations, warranties, covenants or agreements contained in
this Agreement for purposes of determining satisfaction of any condition
contained herein.
 
    (t) FULFILLMENT OF CONDITIONS. Subject to the terms and conditions of this
Agreement, the Company will take or cause to be taken all commercially
reasonable steps necessary or desirable and proceed
 
                                      A-22
<PAGE>
diligently and in good faith to satisfy each condition to the other's
obligations contained in this Agreement and to consummate and make effective the
Merger and other transactions contemplated by this Agreement, and the Company
will not, nor will it permit any of its Subsidiaries to, take or fail to take
any action that could be reasonably expected to result in the nonfulfillment of
any such condition.
 
    (u) THIRD PARTY STANDSTILL AGREEMENTS. Except as provided in SECTION 7.08
hereto, during the period from the date of this Agreement through the Effective
Time, neither the Company nor any of its Subsidiaries shall terminate, amend,
modify or waive any provision of any confidentiality or standstill agreement to
which it is a party. During such period, the Company shall take all steps
necessary to enforce, to the fullest extent permitted under applicable law, the
provisions of any such agreement.
 
    6.02  COVENANTS OF PARENT.  At all times from and after the date hereof
until the Effective Time, Parent covenants and agrees as to itself and NGC that
(except as expressly contemplated or permitted by this Agreement or to the
extent that the Company shall otherwise previously consent in writing):
 
    (a) CERTAIN MERGERS. Parent shall not, and shall not permit any of its
Subsidiaries to, acquire or agree to acquire by merging or consolidating with,
or by purchasing a substantial portion of the assets of or equity in, or by any
other manner, any business or any corporation, partnership, association or other
business organization or division thereof, or otherwise acquire or agree to
acquire any assets if the entering into of a definitive agreement relating to or
the consummation of such acquisition, merger or consolidation could reasonably
be expected to (i) impose any material delay in the obtaining of, or
significantly increase the risk of not obtaining, any authorizations, consents,
orders, declarations or approvals of any Governmental Authority necessary to
consummate the Merger or the expiration or termination of any applicable waiting
period, (ii) significantly increase the risk of any Governmental Authority
entering an order prohibiting the consummation of the Merger, (iii)
significantly increase the risk of not being able to remove any such order on
appeal or otherwise or (iv) materially delay the consummation of the Merger.
 
    (b) NO BREACH. Parent shall not, nor shall it permit any of its Subsidiaries
to, except as otherwise expressly provided for in this Agreement, willfully take
or fail to take any action that would or is reasonably likely to result in (i) a
material breach of any of its covenants or agreements contained in this
Agreement or (ii) any of its representations and warranties set forth in
SECTIONS 5.03, 5.04, 5.05, 5.06, 5.07, 5.08 and 5.09 of this Agreement being
untrue in any material respect on and as of the Closing Date.
 
    (c) ADVICE OF CHANGES. Parent shall confer with the Company on a regular and
frequent basis with respect to any matter having, or which, insofar as can be
reasonably foreseen, could reasonably be expected to have, a Parent Material
Adverse Effect or materially impair the ability of Parent to consummate the
Merger and other transactions contemplated hereby; PROVIDED that Parent shall
not be required to make any disclosure to the extent such disclosure would
constitute a violation of any applicable law or regulation.
 
    (d) NOTICE AND CURE. Parent will notify the Company in writing of, and will
use all commercially reasonable efforts to cure before the Closing, any event,
transaction or circumstance, as soon as practical after it becomes known to
Parent, that causes or will or may be likely to cause any covenant or agreement
of Parent under this Agreement to be breached or that renders or will render
untrue in any material respect any representation or warranty of Parent
contained in this Agreement. Parent also will notify the Company in writing of,
and will use all commercially reasonable efforts to cure before the Closing, any
material violation or breach, as soon as practical after it becomes known to
such party, of any representation, warranty, covenant or agreement made by
Parent. No notice given pursuant to this paragraph shall have any effect on the
representations, warranties, covenants or agreements contained in this Agreement
for purposes of determining satisfaction of any condition contained herein.
 
                                      A-23
<PAGE>
    (e) FULFILLMENT OF CONDITIONS. Subject to the terms and conditions of this
Agreement, Parent will take or cause to be taken all commercially reasonable
steps necessary or desirable and proceed diligently and in good faith to satisfy
each condition to its obligations contained in this Agreement and to consummate
and make effective the Merger and other transactions contemplated by this
Agreement, and Parent will not, nor will it permit any of its Subsidiaries to,
take or fail to take any action that could be reasonably expected to result in
the nonfulfillment of any such condition.
 
    (f) CONDUCT OF BUSINESS OF LLC. Prior to the Effective Time, except as may
be required by applicable law and subject to the other provisions of this
Agreement, Parent shall cause LLC to (i) perform its obligations under this
Agreement in accordance with its terms, and (ii) not engage directly or
indirectly in any business or activities of any type or kind and not enter into
any agreements or arrangements with any person, or be subject to or bound by any
obligation or undertaking, which is inconsistent with this Agreement.
 
    6.03  ADDITIONAL COVENANTS BY PARENT AND THE COMPANY.
 
    (a) CONTROL OF OTHER PARTY'S BUSINESS. Nothing contained in this Agreement
shall give the Company, directly or indirectly, the right to control or direct
Parent's operations prior to the Effective Time. Nothing contained in this
Agreement shall give Parent, directly or indirectly, the right to control or
direct the Company's operations prior to the Effective Time. Prior to the
Effective Time, each of the Company and the Parent shall exercise, consistent
with the terms and conditions of this Agreement, complete control and
supervision over its respective operations.
 
    (b) INTEGRATION TEAM. As soon as practicable after the date hereof, Parent
and the Company shall, subject to limitations imposed by applicable law, create
a special integration steering team (the "INTEGRATION TEAM") which shall be
chaired by David Jones and include David Jones, Richard P. Sergel and such other
designees of each of the Company and Parent as David Jones and Richard P. Sergel
shall deem appropriate. The functions of the Integration Team shall include (i)
to direct the exchange of information and documents between the parties and
their Subsidiaries as contemplated by SECTION 7.01, (ii) to review and evaluate
proposed exceptions to the restrictions on the conduct of business pending the
Merger set forth in Article VI, and (iii) the development of regulatory plans
and proposals, corporate organizational and management plans, workforce
combination proposals, and such other matters as they deem appropriate.
 
                                      A-24
<PAGE>
                                  ARTICLE VII
                             ADDITIONAL AGREEMENTS
 
    7.01  ACCESS TO INFORMATION.  The Company shall, and shall cause each of its
Subsidiaries to, and shall use commercially reasonable efforts to cause the
Company Associates to, throughout the period from the date hereof to the
Effective Time to the extent permitted by law, (i) provide Parent and its
Representatives with full access, upon reasonable prior notice and during normal
business hours, to all facilities, operations, officers (including the Company's
environmental, health and safety personnel), employees, agents and accountants
of the Company and its Subsidiaries and Associates and their respective assets,
properties, books and records, to the extent the Company or any Company
Subsidiary or Company Associate is not under a legal obligation not to provide
access or to the extent that such access would not constitute a waiver of the
attorney client privilege and does not unreasonably interfere with the business
and operations of the Company and its Subsidiaries and Associates and (ii)
furnish promptly to such persons (x) a copy of each report, statement, schedule
and other document filed or received by the Company or any of its Subsidiaries
pursuant to the requirements of federal or state securities laws and each
material report, statement, schedule and other document filed with any other
Governmental Authority, and (y) all other information and data (including,
without limitation, copies of Contracts, Company Employee Benefit Plans, and
other books and records) concerning the business and operations of the Company
and its Subsidiaries as Parent or any of its Representatives reasonably may
request. No review pursuant to this SECTION 7.01 or otherwise shall affect any
representation or warranty contained in this Agreement or any condition to the
obligations of the parties hereto. Any such information or material obtained
pursuant to this SECTION 7.01 that constitutes "EVALUATION MATERIAL" (as such
term is defined in the letter agreement dated as of June 23, 1998 between the
Company and NC (the "Confidentiality Agreement")) shall be governed by the terms
of the Confidentiality Agreement.
 
    7.02  PROXY STATEMENT AND CIRCULAR.  (a) PROXY STATEMENT. As soon as
practicable after the date of this Agreement, the Company shall prepare and file
the Proxy Statement with the SEC. Parent and the Company shall cooperate with
each other in the preparation of the Proxy Statement and any amendment or
supplement thereto, and Company shall promptly notify Parent of the receipt of
any comments of the SEC with respect to the Proxy Statement and of any requests
by the SEC for any amendment or supplement thereto or for additional
information, and shall promptly provide to Parent copies of all correspondence
between the Company or any of its Representatives and the SEC with respect to
the Proxy Statement. Each of the parties hereto shall furnish all information
concerning itself which is required or customary for inclusion in the Proxy
Statement. The Company shall consult with Parent regarding the Proxy Statement
and have due regard to any comments Parent may make in relation to the Proxy
Statement. The Company shall give Parent and its counsel the opportunity to
review the Proxy Statement and all responses to requests for additional
information by and replies to comments of the SEC before their being filed with,
or sent to, the SEC. Each of the Company and Parent agrees to use its reasonable
best efforts, after consultation with the other parties hereto, to respond
promptly to all such comments of and requests by the SEC.
 
    (b) CIRCULAR. Subject to applicable law, Parent shall, as soon as reasonably
practicable after the date of this Agreement and in accordance with the listing
rules of the LSE, prepare and submit to the LSE for approval the Circular, and
shall use its reasonable endeavors to have such documents approved by the LSE as
soon as reasonably practicable after the date of this Agreement. Parent and
Company shall cooperate with each other in the preparation of the Circular and
any amendment or supplement thereto as well as the preparation of any responses
to the LSE in connection therewith. Each of the parties hereto shall furnish all
information concerning itself which is required or customary for inclusion in
the Circular. Each of Parent and the Company agrees to use its reasonable best
efforts to respond promptly to any requests of the LSE.
 
                                      A-25
<PAGE>
    (c) Each of the Company and Parent shall, consistent with the requirements
of the securities laws of the United States and the United Kingdom, use their
reasonable best efforts to cause the Proxy Statement and the Circular to be
mailed or dispatched as soon as practicable to their respective shareholders
entitled to vote on the Merger and other transactions contemplated hereby on or
about the same day.
 
    7.03  APPROVAL OF SHAREHOLDERS.  (a) Parent shall, through its Board of
Directors, duly call, give notice of, convene and hold a general meeting of its
shareholders (the "PARENT SHAREHOLDERS' MEETING"), for the purpose of voting on
the approval of the Merger and other transactions contemplated hereby (the
"PARENT SHAREHOLDERS' APPROVAL") as soon as reasonably practicable after the
date hereof. Subject to fiduciary obligations and the requirements of applicable
law, Parent shall include in the Circular the recommendation of the Board of
Directors of Parent that the Shareholders of Parent approve the Merger and the
other transactions contemplated hereby, and shall use its reasonable endeavors
to obtain such approval in accordance with its usual practices.
 
    (b) The Company shall, through its Board of Directors, duly call, give
notice of, convene and hold a meeting of its shareholders (the "COMPANY
SHAREHOLDERS' MEETING") for the purpose of voting on the approval of the Merger
and other transactions contemplated hereby (the "COMPANY SHAREHOLDERS'
APPROVAL") as soon as reasonably practicable after the date hereof; PROVIDED,
HOWEVER, that if the scheduled meeting date for the Company's annual
shareholders' meeting is within thirty (30) days of the planned date of the
Company Shareholders Meeting, the Company may accomplish the purposes of the
Company Shareholders Meeting at the annual shareholders' meeting. Subject to the
fiduciary duties of its Board of Directors and the requirements of applicable
law, the Company shall include in the Proxy Statement the recommendation of the
Board of Directors of the Company that the Shareholders of the Company approve
the Merger and the other transactions contemplated hereby, and shall use its
reasonable best efforts to obtain such approval.
 
    7.04  REGULATORY AND OTHER APPROVALS.  (a) HSR FILINGS. Each party hereto
shall file or cause to be filed with the Federal Trade Commission and the
Department of Justice any notifications required to be filed by its respective
"ultimate parent" Company under the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended (the "HSR ACT"), and the rules and regulations promulgated
thereunder with respect to the Merger and other transactions contemplated
hereby. Such parties will use all commercially reasonable efforts to make such
filings in a timely manner and to respond on a timely basis to any requests for
additional information made by either of such agencies.
 
    (b) OTHER REGULATORY APPROVALS. Each party hereto shall cooperate and use
its best efforts to promptly prepare and file all necessary documentation, to
effect all necessary applications, notices, petitions, filings and other
documents, and to use all commercially reasonable efforts to obtain all
necessary permits, consents, approvals and authorizations of all Governmental
Authorities necessary or advisable to obtain the Company Required Statutory
Approvals and the Parent Required Statutory Approvals. The parties agree that
they will consult with each other with respect to obtaining the Company Required
Statutory Approvals and the Parent Required Statutory Approvals; provided,
however, that it is agreed that the Company shall have primary responsibility
for the preparation and filing of any related applications, filings or other
material with state utility commissions. Parent shall have the right to review
and approve in advance drafts of and final applications, filings and other
material submitted to or filed with state utility commissions, which approval
shall not be unreasonably withheld or delayed. The Company shall not agree to
the imposition of any condition in the Company Required Statutory Approvals
without the prior consent of Parent.
 
    7.05  EMPLOYEE BENEFIT PLANS.
 
    (a) Parent agrees that those individuals who are employed by the Company or
any of its Subsidiaries immediately prior to the Closing Date shall continue to
be employees of the Surviving Entity or its subsidiaries as of the Closing Date
(each such employee, an "AFFECTED EMPLOYEE"); PROVIDED, HOWEVER,
 
                                      A-26
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that this Section 7.05 shall not be construed to limit the ability of the
applicable employer to terminate the employment of any Affected Employee at any
time.
 
    (b) For a period of twelve (12) months immediately following the Closing
Date, the compensation, benefits and coverage provided to the Affected Employees
pursuant to employee benefit plans or arrangements maintained by Parent or the
Surviving Entity shall be, in the aggregate, not less favorable (as determined
by the Parent and the Surviving Entity using reasonable assumptions and benefit
valuation methods) than those provided to such Affected Employees immediately
prior to the Closing Date. Notwithstanding the foregoing and except as provided
in the immediately following sentence, any such employee benefit plan that
provides as of the date hereof for a continuation period longer than twelve (12)
months shall be honored by Parent or the Surviving Entity. In addition to the
foregoing, Parent shall. or shall cause Surviving Entity to, pay any Affected
Employee whose employment is terminated by Parent or Surviving Entity within
twelve (12) months of the Closing Date a severance benefit package equivalent to
that provided under the special severance plans covering such Affected Employee
as in effect as of the date hereof.
 
    (c) Parent shall, or shall cause the Surviving Entity to, give the Affected
Employees full credit for purposes of eligibility, vesting, benefit accrual
(including, without limitation, benefit accrual under any defined benefit
pension plans) and determination of the level of benefits under any employee
benefit plans or arrangements maintained by the Parent or the Surviving Entity
in effect as of the Closing Date for such Affected Employees' service with the
Company or any Subsidiary of the Company to the same extent recognized by the
Company or such Subsidiary immediately prior to the Closing Date. With respect
to any employee benefit plan or arrangement established by Parent, Company or
the Surviving Entity after the Closing Date (the "POST CLOSING PLANS"), service
shall be credited in accordance with the terms of such Post Closing Plans.
 
    (d) Parent shall, or shall cause the Surviving Entity to, (i) waive all
limitations as to preexisting conditions, exclusions and waiting periods with
respect to participation and coverage requirements applicable to the Affected
Employees under any welfare benefit plan established to replace any Company
welfare benefit plans in which such Affected Employees may be eligible to
participate after the Closing Date, other than limitations or waiting periods
that are already in effect with respect to such Affected Employees and that have
not been satisfied as of the Closing Date under any welfare plan maintained for
the Affected Employees immediately prior to the Closing Date, and (ii) provide
each Affected Employee with credit for any co-payments and deductibles paid
prior to the Closing Date in satisfying any applicable deductible or
out-of-pocket requirements under any welfare plans that such Affected Employees
are eligible to participate in after the Closing Date.
 
    (e) Parent shall, or shall cause the Surviving Entity and its subsidiaries
to, honor, and shall guarantee the obligations of the Surviving Entity and its
subsidiaries under, all employment, severance, consulting and retention
agreements or arrangements and all Company Employee Benefit Plans as in effect
as of the date hereof, as set forth in SECTION 7.05 of the Company Disclosure
Letter, or that are entered into prior to the Closing Date in accordance with
SECTION 6.01I) hereof; PROVIDED, HOWEVER, that this SECTION 7.05(E) is not
intended to prevent Parent or the Surviving Entity from exercising their rights
with respect to such agreements or arrangements and all Company Employee Benefit
Plans in accordance with their terms, including, but not limited to, the right
to alter, terminate or otherwise amend all such agreements and arrangements and
Company Employee Benefit Plans.
 
    (f) Parent agrees and acknowledges that, by virtue of the consummation of
the Merger, Alfred D. Houston has, pursuant to the terms of the Severance
Agreement dated February 28, 1995, between Alfred D. Houston and the Company
(the "HOUSTON AGREEMENT"), Good Reason (as defined in the Houston Agreement) to
terminate his employment with the Company. Following the Closing Date, Parent
agrees and acknowledges that it shall enter into a Consulting Agreement with Mr.
Houston, containing the terms set forth in Section 7.05(f) of the Parent
Disclosure Letter.
 
                                      A-27
<PAGE>
    7.06  LABOR AGREEMENTS AND WORKFORCE MATTERS.
 
    (a) LABOR AGREEMENTS. Parent shall honor or shall cause the appropriate
subsidiaries of the Surviving Entity to honor all collective bargaining
agreements in effect as of Effective Time until their expiration; PROVIDED,
HOWEVER, that this undertaking is not intended to prevent Parent or the
Surviving Entity and its subsidiaries from exercising their rights with respect
to such collective bargaining agreements and in accordance with their terms,
including any right to amend, modify, suspend, revoke or terminate any such
contract, agreement, collective bargaining agreement or commitment or portion
thereof.
 
    (b) WORKFORCE MATTERS. Any workforce reductions carried out following the
Effective Time by the Surviving Entity and its subsidiaries shall be done in
accordance with all applicable collective bargaining agreements and all laws and
regulations governing the employment relationship and termination thereof
including, without limitation, the Worker Adjustment and Retraining Notification
Act and regulations promulgated thereunder, and any comparable state or local
law.
 
    7.07  POST MERGER OPERATIONS.
 
    (a) PARENT BOARD OF DIRECTORS. Parent shall take such action as is necessary
to cause the number of directors comprising its Board of Directors to be
sufficient to permit the appointment of Richard P. Sergel and one additional
person presently serving as an outside director on the Board of Directors of the
Company on the date hereof, as determined by mutual agreement of Parent and the
Company, to serve on the Parent Board of Directors at the Effective Time. In the
event Richard P. Sergel is unavailable to serve on the Parent Board of
Directors, another representative from the current Board of Directors of the
Company shall be chosen by mutual agreement of Parent and the Company.
 
    (b) SURVIVING ENTITY HEADQUARTERS. At the Effective Time, the headquarters
of the Surviving Entity shall be located in Massachusetts and offices for the
Surviving Entity's utility operations in New England shall be located in the
Commonwealth of Massachusetts and the States of New Hampshire and Rhode Island,
consistent with the current operations of the Company.
 
    (c) CHARITIES. The parties agree that provision of charitable contribution
and community support within the New England region serves a number of important
goals. After the Effective Time, Parent intends to cause the Surviving Entity to
provide charitable contributions and community support within the New England
region at annual levels substantially comparable to the annual level of
charitable contributions and community support provided, directly or indirectly,
by the Company and its public utility subsidiaries within the New England region
during 1997.
 
    (d) SURVIVING ENTITY BOARD OF DIRECTORS AND TRUSTEE. After the Effective
Time, the initial board of directors of the Surviving Entity shall have up to
nine (9) members designated from among the officers of Parent and the Surviving
Entity, as mutually agreed by Parent and the Company. Parent reserves the right
to replace the trustee of the Surviving Entity at the Effective Time.
 
    (e) ADVISORY BOARD. Parent shall, promptly following the Effective Time,
cause to be established and be maintained for a period of two (2) years an
advisory board (the "ADVISORY BOARD") comprised of up to eleven (11) persons who
were, immediately prior to the Effective Time, serving as non-executive members
of the Company's Board of Directors and who are willing to serve in such
capacity on the Advisory Board. The function of the Advisory Board shall be to
advise the Surviving Entity's Board of Directors with respect to general
business as well as opportunities and activities in the Surviving Entity's
market area and to maintain and develop customer relationships. The Advisory
Board shall meet no less frequently than semi-annually. The members of the
Advisory Board shall each be named to serve as members thereof for a period of
two years; PROVIDED, HOWEVER, that Parent shall have no obligation to cause the
Surviving Entity to elect or appoint, and may cause the Surviving Entity to
remove, any member of the Advisory Board if Parent reasonably determines that
such member has a conflict of interest that compromises such member's ability to
serve effectively as a member of the
 
                                      A-28
<PAGE>
Advisory Board or any cause exists that otherwise would allow for removal of
such person as a director of the Surviving Entity if such person were a member
of the Surviving Entity's Board of Directors.
 
    (f) EMPLOYMENT AGREEMENTS. At the Effective Time, Parent shall enter into an
employment agreement with Richard P. Sergel in the form set forth in Exhibit A
hereto.
 
    7.08  NO SOLICITATIONS.  Prior to the Effective Time, the Company agrees:
(a) that neither it nor any of its Subsidiaries shall, and it shall use its best
efforts to cause its Representatives (as defined in SECTION 10.11) not to,
knowingly initiate, solicit or encourage, directly or indirectly, any inquiries
or any proposal or offer (including, without limitation, any proposal or offer
to its Shareholders) with respect to a merger, consolidation or other business
combination including the Company or any of its significant Subsidiaries (as
defined in Rule 1-02(W) of Regulation S-X promulgated under the Exchange Act) (a
"COMPANY SIGNIFICANT SUBSIDIARY"), or any acquisition or similar transaction
(including, without limitation, a tender or exchange offer) involving the
purchase of (i) all or any significant portion of the assets of the Company and
its Subsidiaries taken as a whole, (ii) ten percent or more of the outstanding
Company Shares or (iii) 50% or more of the outstanding shares of the capital
stock of any Company Significant Subsidiary (any such proposal or offer being
hereinafter referred to as an "ALTERNATIVE PROPOSAL"), or engage in any
negotiations concerning, or provide any confidential information or data to, or
have any other discussions with, any person or group relating to an Alternative
Proposal, or otherwise knowingly facilitate any effort or attempt to make or
implement an Alternative Proposal other than from Parent and its affiliates; (b)
that it will immediately cease and cause to be terminated any existing
activities, discussions or negotiations with any parties with respect to any
Alternative Proposal; and (c) that it will notify Parent immediately if any such
inquiries, proposals or offers are received by, any such information is
requested from, or any such negotiations or discussions are sought to be
initiated or continued with, it or any of such persons; PROVIDED, HOWEVER, that,
prior to receipt of the Company Shareholders' Approval, nothing contained in
this SECTION 7.08 shall prohibit the Board of Directors of the Company from (i)
furnishing information to (but only pursuant to a confidentiality agreement in
customary form and having terms and conditions no less favorable to the Company
than the Confidentiality Agreement (as defined in SECTION 7.01)) or entering
into discussions or negotiations with any person or group that makes an
unsolicited Alternative Proposal, if, and only to the extent that, (A) the Board
of Directors of the Company, based upon advice of outside counsel with respect
to fiduciary duties, determines in good faith that such action is necessary for
the Board of Directors to act in a manner consistent with its fiduciary duties
to Shareholders under applicable law, (B) the Board of Directors of the Company
has reasonably concluded in good faith (after consultation with its financial
advisors) that the person or group making such Alternative Proposal will have
adequate sources of financing to consummate such Alternative Proposal and that
such Alternative Proposal is likely to be more favorable to the Company's
shareholders than the Merger, (C) prior to furnishing such information to, or
entering into discussions or negotiations with, such person or group, the
Company provides written notice to Parent to the effect that it is furnishing
information to, or entering into discussions or negotiations with, such person
or group, which notice shall identify such person or group and the material
terms of the Alternative Proposal in reasonable detail, and (D) the Company
keeps Parent promptly informed of the status and all material information with
respect to any such discussions or negotiations; and (ii) to the extent
required, complying with Rule 14e-2 promulgated under the Exchange Act with
regard to an Alternative Proposal. Nothing in this SECTION 7.08 shall (x) permit
the Company to terminate this Agreement (except as specifically provided in
ARTICLE IX), (y) permit the Company to enter into any agreement with respect to
an Alternative Proposal for so long as this Agreement remains in effect (it
being agreed that for so long as this Agreement remains in effect, the Company
shall not enter into any agreement with any person or group that provides for,
or in any way knowingly facilitates, an Alternative Proposal (other than a
confidentiality agreement under the circumstances described above)), or (z)
affect any other obligation of the Company under this Agreement.
 
                                      A-29
<PAGE>
    7.09  DIRECTORS' AND OFFICERS' INDEMNIFICATION AND INSURANCE.
 
    (a) INDEMNIFICATION. To the extent, if any, not provided by an existing
right of indemnification or other agreement or policy, from and after the
Effective Time, Parent shall, or shall cause the Surviving Entity to, to the
fullest extent permitted by applicable law, indemnify, defend and hold harmless
each person who is now, or has been at any time prior to the date hereof, or who
becomes prior to the Effective Time, (x) an officer or director or (y) an
employee covered as of the date hereof (to the extent of the coverage extended
as of the date hereof) of the Company or of any Company Subsidiary (each an
"INDEMNIFIED PARTY," and collectively, the "INDEMNIFIED PARTIES") against (i)
all losses, expenses (including reasonable attorney's fees and expenses),
claims, damages or liabilities or, subject to the first proviso of the next
succeeding sentence, amounts paid in settlement, arising out of actions or
omissions occurring at or prior to the Effective Time (and whether asserted or
claimed prior to, at or after the Effective Time) that are, in whole or in part,
based on or arising out of the fact that such person is or was a director,
officer or employee of the Company or any Company Subsidiary (the "INDEMNIFIED
LIABILITIES"), and (ii) all Indemnified Liabilities to the extent they are based
on or arise out of or pertain to the transactions contemplated by this
Agreement, in each case, to the extent permitted by the Trust Agreement or the
indemnification agreements set forth in SECTION 7.09 of the Company Disclosure
Letter. In the event of any such loss, expense, claim, damage or liability
(whether or not arising before the Effective Time), (i) Parent shall, or shall
cause the Surviving Entity to, pay the reasonable fees and expenses of counsel
selected by the Indemnified Parties, which counsel shall be reasonably
satisfactory to Parent or the Surviving Entity, as appropriate, promptly after
statements therefor are received and otherwise advanced to such Indemnified
Party upon request, reimbursement of documented expenses reasonably incurred, in
either case to the extent not prohibited by the Trust Agreement or the
indemnification agreements set forth in SECTION 7.09 of the Company Disclosure
Letter upon receipt of an undertaking by or on behalf of such director or
officer to repay such amounts as and to the extent required by the Trust
Agreement or the indemnification agreements set forth in SECTION 7.09 of the
Company Disclosure Letter, (ii) the Surviving Entity shall cooperate in the
defense of any such matter and (iii) any determination required to be made with
respect to whether an Indemnified Party's conduct complies with the standards
set forth under the Trust Agreement or the indemnification agreements set forth
in SECTION 7.09 of the Company Disclosure Letter and the certificate of
incorporation or by-laws or similar governing documents of the Surviving Entity
shall be made by independent counsel mutually acceptable to the Surviving Entity
and the Indemnified Party; provided, however, that the Surviving Entity shall
not be liable for any settlement effected without its written consent (which
consent shall not be unreasonably withheld) and provided further that no
indemnification shall be made if such indemnification is prohibited by the Trust
Agreement or the indemnification agreements set forth in SECTION 7.09 of the
Company Disclosure Letter.
 
    (b) INSURANCE. For a period of six years after the Effective Time, Parent
and the Surviving Entity shall at Parent's election, cause to be maintained in
effect an extended reporting period for current policies of directors' and
officers' liability insurance for the benefit of such persons who are currently
covered by such policies of the Company on terms no less favorable than the
terms of such current insurance coverage or provide tail coverage for such
persons which provides such persons with coverage for a period of six years for
acts prior to the Effective Time on terms no less favorable than the terms of
such current insurance coverage.
 
    (c) SUCCESSORS. In the event the Surviving Entity or any of its successors
or assigns (i) consolidates with or mergers into any other person or entity and
shall not be the continuing or surviving corporation or entity of such
consolidation or merger or (ii) transfers all or substantially all of its
properties and assets to any person or entity, then and in either such case,
proper provisions shall be made so that the successors and assigns of the
Surviving Entity, as applicable, shall assume the obligations set forth in this
SECTION 7.09.
 
                                      A-30
<PAGE>
    (d) SURVIVAL OF INDEMNIFICATION. To the fullest extent permitted by law,
from and after the Effective Time, all rights to indemnification as of the date
hereof in favor of the employees, agents, directors and officers of the Company
and the Company Subsidiaries with respect to their activities as such prior to
the Effective Time, as provided in the Trust Agreement or the respective
certificates of incorporation and by-laws or similar governing documents in
effect on the date hereof, or otherwise in effect on the date hereof, shall
survive the Merger and shall continue in full force and effect for a period of
not less than six years from the Effective Time.
 
    (e) BENEFIT. The provisions of this SECTION 7.09 are intended to be for the
benefit of, and shall be enforceable by, each Indemnified Party, his or her
heirs and his or her representatives.
 
    (f) AMENDMENT OF THE TRUST AGREEMENT. Parent shall not, and shall ensure
that the Surviving Entity shall not, amend the Trust Agreement to in any way
limit the indemnification provided to the Indemnified Parties under this SECTION
7.09.
 
    7.10  EXPENSES.  Except as set forth in SECTION 9.03, whether or not the
Merger is consummated, all costs and expenses incurred in connection with the
Merger and other transactions contemplated hereby shall be paid by the party
incurring such cost or expense, except that the filing fees in connection with
the filings required under the HSR Act, Exon Florio (as defined in SECTION
8.01(D) hereof) and the 1935 Act shall be paid by Parent or LLC.
 
    7.11  BROKERS OR FINDERS.  The Company represents, as to itself and its
affiliates, that no agent, broker, investment banker, financial advisor or other
firm or person is or will be entitled to any broker's or finder's fee or any
other commission or similar fee in connection with any of the Merger and other
transactions contemplated by this Agreement except Merrill Lynch, whose fees and
expenses will be paid by the Company in accordance with the Company's agreement
with such firm, and the Company shall indemnify and hold Parent harmless from
and against any and all claims, liabilities or obligations with respect to any
other such fee or commission or expenses related thereto asserted by any person
on the basis of any act or statement alleged to have been made by the Company or
its affiliates.
 
    7.12  ANTI-TAKEOVER STATUTES.  If any "FAIR PRICE", "MORATORIUM", "BUSINESS
COMBINATION", "CONTROL SHARE ACQUISITION" or other form of anti-takeover statute
or regulation shall become applicable to the Merger or other transactions
contemplated hereby, the Company and the members of the Board of Directors of
the Company shall grant such approvals and take such actions consistent with
their fiduciary duties and in accordance with applicable law as are reasonably
necessary so that the Merger and other transactions contemplated hereby may be
consummated as promptly as practicable on the terms contemplated hereby and
otherwise act to eliminate or minimize the effects of such statute or regulation
on the Merger and other transactions contemplated hereby.
 
    7.13  PUBLIC ANNOUNCEMENTS.  Except as otherwise required by law or the
rules of any applicable securities exchange or national market system or any
other Regulatory Authority, so long as this Agreement is in effect, Parent and
the Company will not, and will not permit any of their respective Subsidiaries
or Representatives to, issue or cause the publication of any press release or
make any other public announcement with respect to the Merger and other
transactions contemplated by this Agreement without the consent of the other
party, which consent shall not be unreasonably withheld. Parent and the Company
will cooperate with each other in the development and distribution of all press
releases and other public announcements with respect to the Merger and other
transactions contemplated hereby, and will furnish the other with drafts of any
such releases and announcements as far in advance as practicable.
 
    7.14  RESTRUCTURING OF MERGER.  It may be preferable to effectuate a
business combination between Parent and the Company by means of an alternative
structure to the Merger. Accordingly, if, prior to satisfaction of the
conditions contained in ARTICLE VIII hereto, Parent proposes the adoption of an
 
                                      A-31
<PAGE>
alternative structure that otherwise substantially preserves for Parent and the
Company the economic benefits of the Merger and will not materially delay the
consummation thereof, then the parties shall use their respective best efforts
to effect a business combination among themselves by means of a mutually agreed
upon structure other than the Merger that so preserves such benefits; PROVIDED
that prior to closing any such restructured transaction, all material third
party and Governmental Authority declarations, filings, registrations, notices,
authorizations, consents or approvals necessary for the effectuation of such
alternative business combination shall have been obtained and all other
conditions to the parties' obligations to consummate the Merger and other
transactions contemplated hereby, as applied to such alternative business
combination, shall have been satisfied or waived.
 
                                  ARTICLE VIII
                                   CONDITIONS
 
    8.01  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.  The
respective obligation of each party to effect the Merger and other transactions
contemplated hereby is subject to the satisfaction or waiver on at or prior to
the Closing, of each of the following conditions:
 
    (a) SHAREHOLDER APPROVAL. The Company Shareholders' Approval shall have been
obtained and the Parent Shareholders' Approval shall have been obtained.
 
    (b) HSR ACT. Any waiting period (and any extension thereof) applicable to
the consummation of the Merger under HSR shall have expired or been terminated.
 
    (c) INJUNCTIONS OR RESTRAINTS. No court of competent jurisdiction or other
competent Governmental Authority shall have enacted, issued, promulgated,
enforced or entered any law or order (whether temporary, preliminary or
permanent) which is then in effect and has the effect of making illegal or
otherwise restricting, preventing or prohibiting consummation of the Merger or
other transactions contemplated hereby.
 
    (d) EXON-FLORIO. Review and investigation of the Merger under the
Exon-Florio Provisions of the Omnibus Trade and Competitiveness Act of 1988
("Exon Florio") shall have been terminated and the President shall have taken no
action authorized thereunder.
 
    (e) GOVERNMENTAL AND REGULATORY AND OTHER CONSENTS AND APPROVALS. The Parent
Required Statutory Approvals and the Company Required Statutory Approvals shall
have been obtained prior to the Effective Time, and shall have become Final
Orders (as hereinafter defined). The Final Orders shall not, individually or in
the aggregate, impose terms and conditions that (i) could reasonably be expected
to have a Company Material Adverse Effect; (ii) could reasonably be expected to
have a Parent Material Adverse Effect or (iii) materially impair the ability of
the parties to complete the Merger or transactions contemplated hereby. "FINAL
ORDER" for all purposes of this Agreement means action by the relevant
regulatory authority which has not been reversed, stayed, enjoined, set aside,
annulled or suspended with respect to which any waiting period prescribed by law
before the Merger and other transactions contemplated hereby may be consummated
has expired, and as to which all conditions to be satisfied before the
consummation of such transactions prescribed by law, regulation or order have
been satisfied.
 
    8.02  CONDITIONS TO OBLIGATION OF PARENT AND LLC TO EFFECT THE MERGER.  The
obligation of Parent and LLC to effect the Merger and other transactions
contemplated hereby is further subject to the satisfaction or waiver at or prior
to the Closing, of each of the following additional conditions (all or any of
which may be waived in whole or in part by Parent and LLC in their sole
discretion):
 
    (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties made
by the Company in this Agreement, in each case made as if none of such
representations or warranties contained any qualification or limitation as to
"materiality" or "Company Material Adverse Effect", shall be true and
 
                                      A-32
<PAGE>
correct as so made as of the Closing Date as though so made on and as of the
Closing Date, except to the extent expressly given as of a specified date,
except where the failure of such representations and warranties to be true and
correct as so made does not have and could not reasonably be expected to have,
individually or in the aggregate, a Company Material Adverse Effect, and the
Company shall have delivered to Parent a certificate, dated the Closing Date and
executed in the name and on behalf of the Company by its Chairman of the Board,
President or any Executive or Senior Vice President, to such effect.
 
    (b) PERFORMANCE OF OBLIGATIONS. The Company shall have performed and
complied with, in all material respects, each agreement, covenant and obligation
required by this Agreement to be so performed or complied with by the Company at
or prior to the Closing, and the Company shall have delivered to Parent a
certificate, dated the Closing Date and executed in the name and on behalf of
the Company by its Chairman of the Board, President or any Executive or Senior
Vice President, to such effect.
 
    (c) MATERIAL ADVERSE EFFECT. No Company Material Adverse Effect shall have
occurred and there shall exist no facts or circumstances which in the aggregate
could reasonably be expected to have a Company Material Adverse Effect.
 
    (d) COMPANY REQUIRED CONSENTS. All Company Required Consents shall have been
obtained by the Company, except where the failure to receive such Company
Required Consents could not reasonably be expected to (i) have a Company
Material Adverse Effect, or (ii) delay or prevent the consummation of the Merger
and other transactions contemplated hereby.
 
    8.03  CONDITIONS TO OBLIGATION OF THE COMPANY TO EFFECT THE MERGER.  The
obligation of the Company to effect the Merger and other transactions
contemplated hereby is further subject to the satisfaction or waiver, at or
prior to the Closing, of each of the following additional conditions (all or any
of which may be waived in whole or in part by the Company in its sole
discretion):
 
    (a) REPRESENTATIONS AND WARRANTIES. The representations and warranties made
by Parent and LLC in SECTIONS 5.03, 5.04, 5.05, 5.07, 5.08 and 5.09 of this
Agreement, in each case made as if none of such representations or warranties
contained any qualification or limitation as to "materiality" or "Parent
Material Adverse Effect," shall be true and correct as so made as of the Closing
Date, except to the extent expressly given as of a specified date and except
where the failure of such representations and warranties to be so true and
correct as so made does not have and could not reasonably be expected to have,
individually or in the aggregate, a Parent Material Adverse Effect or a material
adverse effect on LLC, and Parent and LLC shall each have delivered to the
Company a certificate, dated the Closing Date and executed in the name and on
behalf of Parent by any director of Parent and in the name and on behalf of LLC
by a member of its management committee to such effect.
 
    (b) PARENT REQUIRED CONSENTS. All Parent Required Consents shall have been
obtained by Parent, except where the failure to receive such Parent Required
Consents could not reasonably be expected to (i) have a Parent Material Adverse
Effect or (ii) delay or prevent the consummation of the Merger and other
transactions contemplated hereby.
 
    (c) PERFORMANCE OF OBLIGATIONS. Parent and LLC shall have performed and
complied with, in all material respects, each agreement, covenant and obligation
required by this Agreement to be so performed or complied with by Parent or LLC
at or prior to the Closing, and Parent and LLC shall each have delivered to the
Company a certificate, dated the Closing Date and executed in the name and on
behalf of Parent by any director of Parent and in the name and on behalf of LLC
by a member of its management committee to such effect.
 
                                      A-33
<PAGE>
                                   ARTICLE IX
                       TERMINATION, AMENDMENT AND WAIVER
 
    9.01  TERMINATION. This Agreement may be terminated, and the Merger and
other transactions contemplated hereby may be abandoned, at any time prior to
the Effective Time, whether prior to or after the Company Shareholders' Approval
or the Parent Shareholders' Approval (except as otherwise provided in SECTION
9.01(C) below):
 
    (a)  By mutual written agreement of the Board of Directors of Parent and the
Company, respectively;
 
    (b)  By the Company or Parent, by written notice to the other, if the
Closing Date shall not have occurred on or before the date that is the nine (9)
month anniversary of the date the Company Shareholders' Approval is obtained
(the "INITIAL TERMINATION DATE"); provided, however, that the right to terminate
the Agreement under this SECTION 9.01(B) shall not be available to any party
whose failure to fulfill any obligation under this Agreement has been the cause
of, or resulted in, the failure of the Effective Time to occur on or before such
date; and provided, further, that (i) if on the Initial Termination Date the
conditions to the Closing set forth in SECTION 8.01(E)(I) shall not have been
fulfilled but all other conditions to the Closing shall be fulfilled or shall be
capable of being fulfilled, then the Initial Termination Date shall be extended
for six (6) months beyond the Initial Termination Date (the "EXTENDED
TERMINATION DATE") and (ii) if on the Initial Termination Date or, if the
Initial Termination Date has been extended as provided in the immediately
preceding clause (i), the Extended Termination Date, a Financial Disruption (as
defined in SECTION 9.03(D))shall have occurred and be continuing, then the
Company shall have the right, but not the obligation, to postpone the Closing to
a date not later than the date that is the six (6) month anniversary of the
Initial Termination Date or the Extended Termination Date, as the case may be,
provided that no postponement of the Closing made as permitted by this SECTION
9.01(B)(II) shall operate as or be deemed to be a waiver of any or all of the
provisions of Section 8.02;
 
    (c)  By the Company or Parent, by written notice to the other, if (i) the
Company Shareholders' Approval shall not have been obtained at a duly held
meeting of such Shareholders, including any adjournments thereof or (ii) the
Parent Shareholders' Approval shall not have been obtained at a duly held
meeting of such shareholders, including any adjournments thereof;
 
    (d)  By the Company or Parent, if any applicable state or federal law or
applicable law of a foreign jurisdiction or any order, rule or regulation is
adopted or issued that has the effect, as supported by the written opinion of
outside counsel for such party, of prohibiting the Merger or other transactions
contemplated hereby, or if any court of competent jurisdiction or any
Governmental Authority shall have issued a nonappealable final order, judgment
or ruling or taken any other action having the effect of permanently
restraining, enjoining or otherwise prohibiting the Merger or other transactions
contemplated hereby (provided that the right to terminate this Agreement under
this SECTION 9.01(D) shall not be available to any party that has not defended
such lawsuit or other legal proceeding (including seeking to have any stay or
temporary restraining order entered by any court or other Governmental Authority
vacated or reversed)).
 
    (e)  By the Company upon ten (10) days' prior notice to Parent if the Board
of Directors of the Company determines in good faith, that termination of this
Agreement is necessary for the Board of Directors of the Company to act in a
manner consistent with its fiduciary duties to Shareholders under applicable law
by reason of an unsolicited Alternative Proposal meeting the requirements of
clauses (A) and (B) of SECTION 7.07 having been made; PROVIDED that
 
        (A)  The Board of Directors of the Company shall determine based on
    advice of outside counsel with respect to the Board of Directors' fiduciary
    duties that notwithstanding a binding commitment to consummate an agreement
    of the nature of this Agreement entered into in the
 
                                      A-34
<PAGE>
    proper exercise of its applicable fiduciary duties, and notwithstanding all
    concessions which may be offered by Parent in negotiation entered into
    pursuant to clause (B) below, it is necessary pursuant to such fiduciary
    duties that the directors reconsider such commitment as a result of such
    Alternative Proposal, and
 
        (B)  prior to any such termination, the Company shall, and shall cause
    its respective financial and legal advisors to, negotiate with Parent to
    make such adjustments in the terms and conditions of this Agreement as would
    enable the Company to proceed with the Merger or other transactions
    contemplated hereby on such adjusted terms;
 
    and PROVIDED FURTHER that the Company's ability to terminate this Agreement
pursuant to this SECTION 9.01(E) is conditioned upon the concurrent payment by
the Company to Parent of any amounts owed by it pursuant to SECTION 9.03(B);
 
    (f)  By the Company, by written notice to Parent, if (i) there shall have
been any material breach of any representation or warranty, or any material
breach of any covenant or agreement, of Parent hereunder (other than a breach
described in clause (ii)), and such breach shall not have been remedied within
twenty (20) days after receipt by Parent of notice in writing from the Company,
specifying the nature of such breach and requesting that it be remedied; (ii)
Parent shall fail to deliver or cause to be delivered the amount of cash to the
Paying Agent required pursuant to Section 2.02(a) at a time when all conditions
to Parent's obligation to close have been satisfied or otherwise waived in
writing by Parent; or (iii) the Board of Directors of Parent shall withdraw or
modify, or resolve to withdraw or modify, in any manner adverse to the Company
its approval of the Merger and other transactions contemplated hereby or its
recommendation to its Shareholders regarding the approval of this Agreement, the
Merger or other transactions contemplated hereby.
 
    (g)  By Parent, by written notice to the Company, if (i) there shall have
been any material breach of any representation or warranty, or any material
breach of any covenant or agreement, of the Company hereunder, and such breach
shall not have been remedied within twenty (20) days after receipt by the
Company of notice in writing from Parent, specifying the nature of such breach
and requesting that it be remedied; or (ii) the Board of Directors of the
Company (A) shall withdraw or modify in any manner adverse to Parent its
approval of the Merger and other transactions contemplated hereby or its
recommendation to its shareholders regarding the approval of this Agreement, the
Merger and other transactions contemplated hereby, (B) shall approve or
recommend or take no position with respect to an Alternative Proposal or (C)
shall resolve to take any of the actions specified in clause (A) or (B).
 
    (h)  By Parent, by written notice to the Company on or after the twelve (12)
month anniversary of the date on which the Company Shareholders' Approval is
obtained, if the Order of the SEC approving the Merger under the 1935 Act (the
"1935 ACT ORDER") shall not have been issued prior to the time such notice is
given and Parent reasonably believes that the 1935 Act Order is not likely to be
issued on or prior to the Extended Termination Date.
 
    9.02  EFFECT OF TERMINATION. If this Agreement is validly terminated by
either the Company or Parent pursuant to SECTION 9.01, this Agreement shall
forthwith become null and void and there shall be no liability or obligation on
the part of either the Company, Parent or LLC (or any of their respective
Representatives or affiliates), except that the provisions of this SECTION 9.02,
SECTIONS 7.10, 7.11 and 7.13, Section 9.03 and SECTIONS 10.09 and 10.10 shall
continue to apply following any such termination.
 
    9.03  TERMINATION FEES. (a) In the event that this Agreement is terminated
(i) by Parent pursuant to SECTION 9.01(G)(I) or SECTION 9.01(C) as a result of
the Company Shareholders' Approval not being obtained and at such time no
Alternative Proposal has been made and remains outstanding or (ii) by the
Company pursuant to SECTION 9.01(F)(I) or SECTION 9.01(C) as a result of Parent
Shareholders' Approval not being obtained, then in (A) the event of termination
pursuant to SECTION 9.01(G)(I) or SECTION 9.01(C) as a result of the Company
Shareholder's Approval not being obtained and at a time
 
                                      A-35
<PAGE>
when no Alternative Proposal remains outstanding the Company shall pay to Parent
and (B) in the event of termination pursuant to SECTION 9.01(F)(I), or Section
9.01(c) as a result of Parent Shareholders' Approval not being obtained, Parent
shall pay to the Company, promptly (but no later than five (5) business days
after the date of termination of this Agreement), cash in an amount equal to all
documented out-of-pocket expenses and fees incurred by the party arising out of,
or in connection with or related to, the Merger and other transactions
contemplated hereby, not in excess of $10 million (the "OUT-OF-POCKET
EXPENSES").
 
    (b)  In the event that this Agreement is terminated (i) by the Company
pursuant to SECTION 9.01(F)(III) or (ii) by Parent pursuant to SECTION
9.01(G)(II), and, in the case of a termination under clause (A) of Section
9.01(g)(ii) is as a result of an action by the Board of Directors of the Company
prior to obtaining the Company Shareholders' Approval, then (A) in the event of
termination pursuant to SECTION 9.01(G)(II), the Company shall pay to Parent and
(B) in the event of termination pursuant to SECTION 9.01(F)(III) as a result of
an action by the Board of Directors of the Parent prior to obtaining the Parent
Shareholders' Approval, Parent shall pay to the Company, (promptly but in each
case no later than five (5) business days after the date of termination of this
Agreement) by wire transfer of same day funds, a termination fee of
$100,000,000, plus, in each case, the terminating party's Out-of-Pocket
Expenses.
 
    (c)  In the event that (i) this Agreement is terminated by the Company
pursuant to SECTION 9.01(E) or (ii) any person or group shall have made an
Alternative Proposal that has not been withdrawn and this Agreement is
terminated by Parent pursuant to SECTION 9.01(G)(I) or SECTION 9.01(C)as a
result of the Company Shareholders' Approval not being obtained or by the
Company pursuant to Section 9.01(b) and, in the case of this clause (ii) only, a
definitive agreement with respect to such Alternative Proposal is executed
within two years after such termination, then the Company shall pay to Parent,
by wire transfer of same day funds, either on the date contemplated in SECTION
9.01(E) if applicable, or otherwise, within five (5) business days after such
termination, a termination fee of $100,000,000, plus the Out-of-Pocket Expenses
of Parent to the extent not otherwise payable pursuant to SECTION 9.03(A) above.
 
    (d)  If this Agreement is terminated by the Company, pursuant to Section
9.01(f)(ii) and the failure by Parent referred to in such Section is because of
the occurrence of any significant disruptions in the financial or capital
markets which make it impracticable for a company having financial
characteristics similar to those of Parent as of the date of this Agreement to
finance a transaction of the size and nature as that contemplated hereunder on
commercially reasonable financing terms that are available as of the date of
such financing (a "FINANCIAL DISRUPTION"), then Parent shall pay to the Company
a termination fee of $100,000,000. The parties hereby acknowledge that a failure
by Parent to deliver or cause to be delivered the appropriate amount of cash as
a result of a Financial Disruption shall not constitute a willful breach of any
representation, warranty, covenant or agreement of Parent hereunder.
 
    (e)  In the event this Agreement is terminated by Parent pursuant to SECTION
9.01(H), then Parent shall pay the Company, in cash by wire transfer of same day
funds within five (5) business days of such termination notice, a termination
fee of $75,000,000 (the "REGULATORY TERMINATION FEE") plus the Out-of-Pocket
Expenses of the Company; provided, however, that the Regulatory Termination Fee
shall not be payable to the Company if the failure to obtain the 1935 Act Order
by the twelve (12) month anniversary of the date on which the Company
Shareholders' Approval is obtained has been caused by breach of this Agreement
by the Company after the date hereof.
 
    (f)  NATURE OF FEES. The parties agree that the agreements contained in this
Section 9.03 are an integral part of the Merger and the other transactions
contemplated hereby and constitute liquidated damages and not a penalty. The
parties further agree that if any party is or becomes obligated to pay a
termination fee pursuant to SECTIONS 9.03(B)-(E), the right to receive such
termination fee shall be the sole remedy of the other party with respect to the
facts and circumstances giving rise to such payment
 
                                      A-36
<PAGE>
obligation. If this Agreement is terminated by a party as a result of a willful
breach of a representation, warranty, covenant or agreement by the other party,
including a termination pursuant to SECTION 9.01(F)(II) caused by reasons other
than a Financial Disruption, the non-breaching party may pursue any remedies
available to it at law or in equity and shall be entitled to recover any
additional amounts thereunder. Notwithstanding anything to the contrary
contained in this SECTION 9.03, if one party fails to promptly pay to the other
any fee or expense due under this SECTION 9.03, in addition to any amounts paid
or payable pursuant to such Section, the defaulting party shall pay the costs
and expenses (including legal fees and expenses) in connection with any action,
including the filing of any lawsuit or other legal action, taken to collect
payment, together with interest on the amount of any unpaid fee at the publicly
announced prime rate of Citibank, N.A. from the date such fee was required to be
paid.
 
    9.04  AMENDMENT. This Agreement may be amended, supplemented or modified by
action taken by or on behalf of the Board of Directors of the parties hereto at
any time prior to the Effective Time, whether prior to or after the Company
Shareholders' Approval or the Parent Shareholders' Approval shall have been
obtained, but after such adoption and approval only to the extent permitted by
applicable law. No such amendment, supplement or modification shall be effective
unless set forth in a written instrument duly executed and delivered by or on
behalf of each party hereto.
 
    9.05  WAIVER. At any time prior to the Effective Time, Parent or the
Company, by action taken by or on behalf of its Board of Directors, may to the
extent permitted by applicable law (i) extend the time for the performance of
any of the obligations or other acts of the other parties hereto, (ii) waive any
inaccuracies in the representations and warranties of the other parties hereto
contained herein or in any document delivered pursuant hereto or (iii) waive
compliance with any of the covenants, agreements or conditions of the other
parties hereto contained herein. No such extension or waiver shall be effective
unless set forth in a written instrument duly executed by or on behalf of the
party extending the time of performance or waiving any such inaccuracy or
non-compliance. No waiver by any party of any term or condition of this
Agreement, in any one or more instances, shall be deemed to be or construed as a
waiver of the same or any other term or condition of this Agreement on any
future occasion.
 
                                   ARTICLE X
                               GENERAL PROVISIONS
 
    10.01  NON-SURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
AGREEMENTS. The representations, warranties, covenants and agreements contained
in this Agreement or in any instrument delivered pursuant to this Agreement
shall not survive the Merger but shall terminate at the Effective Time, except
for the agreements contained in ARTICLE I and ARTICLE II, in SECTIONS 7.05,
7.06, 7.08, 7.09 and 7.10, this ARTICLE X which shall survive the Effective
Time.
 
    10.02  NOTICES. All notices, requests and other communications hereunder
must be in writing and will be deemed to have been duly given only if delivered
personally or by facsimile transmission or sent by overnight courier (providing
proof of delivery) to the parties at the following addresses or facsimile
numbers:
 
    If to Parent or LLC, to:
 
                    The National Grid Group Plc
                    National Grid House
                    Kirby Corner Road
                    Coventry CV4 8JY
                    United Kingdom
 
                                      A-37
<PAGE>
                    Attn: David Jones
                    Chief Executive
 
                    Telephone: (011-44-1203) 423-006
                    Facsimile: (011-44-1203) 423-026
 
with a copy to:
 
                    LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                    125 West 55th Street
                    New York, N.Y. 10019
                    Attn: Steven H. Davis, Esq.
                         and Douglas W. Hawes, Esq.
 
                    Telephone: (212) 424-8000
                    Facsimile: (212) 424-8500
 
                    and
 
                    Cameron McKenna
                    Mitre House
                    160 Aldersgate Street
                    London EC1A 4DD
                    United Kingdom
                    Attn: Sean M. Watson. Esq.
                    Telephone: (011) 44-1-71-367-3000
                    Facsimile: (011) 44-1-71-367-2000
 
If to the Company, to:
 
                    New England Electric System
                    25 Research Drive
                    Westborough, MA 01582
                    U.S.A.
                    Attn: Richard P. Sergel
                         President and Chief Executive Officer
 
                    Telephone: (508) 389-2764
                    Facsimile: (508) 366-5498
 
with a copy to:
 
                    Skadden, Arps, Slate, Meagher & Flom LLP
                    919 Third Avenue
                    New York, N.Y. 10022
                    Attn: Sheldon S. Adler, Esq.
                    Telephone: (212) 735-3000
                    Facsimile: (212) 735-2000
 
    All such notices, requests and other communications will (i) if delivered
personally to the address as provided in this Section, be deemed given upon
delivery, (ii) if delivered by facsimile transmission to the facsimile number as
provided in this Section, be deemed given when sent, provided that the facsimile
is promptly confirmed by telephone confirmation thereof, and (iii) if delivered
by mail in the manner described above to the address as provided in this
Section, be deemed given one business day after delivery (in each case
regardless of whether such notice, request or other communication is received by
any other person to whom a copy of such notice, request or other communication
is to be delivered pursuant to this Section). Any party from time to time may
change its address, facsimile
 
                                      A-38
<PAGE>
number or other information for the purpose of notices to that party by giving
notice specifying such change to the other parties hereto.
 
    10.03  ENTIRE AGREEMENT; INCORPORATION OF EXHIBITS. (a) This Agreement
supersedes all prior discussions and agreements, both written and oral, among
the parties hereto with respect to the subject matter hereof, other than the
Confidentiality Agreement, which shall survive the execution and delivery of
this Agreement in accordance with its terms, and contains, together with the
Confidentiality Agreement, the sole and entire agreement among the parties
hereto with respect to the subject matter hereof.
 
    (b)  The Company Disclosure Letter, the Parent Disclosure Letter and any
Exhibit attached to this Agreement and referred to herein are hereby
incorporated herein and made a part hereof for all purposes as if fully set
forth herein.
 
    10.04  NO THIRD PARTY BENEFICIARY. The terms and provisions of this
Agreement are intended solely for the benefit of each party hereto and their
respective successors or permitted assigns, and except as provided in Article II
and SECTION 7.09 (which is intended to be for the benefit of the persons
entitled to therein, and may be enforced by any of such persons), it is not the
intention of the parties to confer third-party beneficiary rights upon any other
person.
 
    10.05  NO ASSIGNMENT; BINDING EFFECT. Neither this Agreement nor any right,
interest or obligation hereunder may be assigned, in whole or in part, by
operation of law or otherwise, by any party hereto without the prior written
consent of the other parties hereto and any attempt to do so will be void,
except that LLC may assign any or all of its rights, interests and obligations
hereunder to another direct or indirect wholly owned Subsidiary of Parent,
PROVIDED that any such Subsidiary agrees in writing to be bound by all of the
terms, conditions and provisions contained herein and PROVIDED FURTHER that such
assignment (i) does not require a greater vote for the Company's Shareholder
Approval, (ii) does not require a subsequent vote following the Company's
Shareholders Meeting, or (iii) is not reasonably likely to materially delay or
prevent the Company, LLC and Parent, as appropriate, from obtaining the Company
Required Statutory Approvals, the Company Required Consents, the Company
Shareholders' Approval, the Parent Required Shareholders' Approvals, the Parent
Required Consents or the Parent Shareholders' Approval. Subject to the preceding
sentence, this Agreement is binding upon, inures to the benefit of and is
enforceable by the parties hereto and their respective successors and assigns.
 
    10.06  HEADINGS. The headings used in this Agreement have been inserted for
convenience of reference only and do not define, modify or limit the provisions
hereof.
 
    10.07  INVALID PROVISIONS. If any provision of this Agreement is held to be
illegal, invalid or unenforceable under any present or future law or order, and
if the rights or obligations of any party hereto under this Agreement will not
be materially and adversely affected thereby, (i) such provision will be fully
severable, (ii) this Agreement will be construed and enforced as if such
illegal, invalid or unenforceable provision had never comprised a part hereof,
and (iii) the remaining provisions of this Agreement will remain in full force
and effect and will not be affected by the illegal, invalid or unenforceable
provision or by its severance herefrom.
 
    10.08  GOVERNING LAW. Except to the extent that the MGL and the
Massachusetts Limited Liability Company Act is mandatorily applicable to the
Merger and the rights of the Shareholders of the Constituent Corporations, this
Agreement shall be governed by and construed in accordance with the laws of the
State of New York applicable to a contract executed and performed in such State,
without giving effect to the conflicts of laws principles thereof.
 
    10.09  SUBMISSION TO JURISDICTION; WAIVERS. Each of Parent, LLC and the
Company irrevocably agree that any legal action or proceeding with respect to
this Agreement or for recognition and enforcement of any judgment in respect
hereof brought by another party hereto or its successors or assigns may be
brought and determined in the Supreme Court of the State of New York in New York
 
                                      A-39
<PAGE>
County or in the United States District Court for the Southern District of New
York, and each of Parent, LLC and the Company hereby irrevocably submits with
regard to any such action or proceeding for itself and in respect to its
property, generally and unconditionally, to the nonexclusive jurisdiction of the
aforesaid courts. Any service of process to be made in such action or proceeding
may be made by delivery of process in accordance with the notice provisions
contained in SECTION 10.02. Each of Parent, LLC, and the Company hereby
irrevocably waives, and agrees not to assert, by way of motion, as a defense,
counterclaim or otherwise, in any action or proceeding with respect to this
Agreement, (a) the defense of sovereign immunity, (b) any claim that it is not
personally subject to the jurisdiction of the above-named courts for any reason
other than the failure to serve process in accordance with this SECTION 10.09,
(c) that it or its property is exempt or immune from jurisdiction of any such
court or from any legal process commenced in such courts (whether through
service of notice, attachment prior to judgment, attachment in aid of execution
of judgment, execution of judgment or otherwise), and (d) to the fullest extent
permitted by applicable law that (i) the suit, action or proceeding in any such
court is brought in an inconvenient forum, (ii) the venue of such suit, action
or proceeding is improper and (iii) this Agreement, or the subject matter
hereof, may not be enforced in or by such courts.
 
    10.10  ENFORCEMENT OF AGREEMENT. The parties hereto agree that irreparable
damage would occur in the event that any of the provisions of this Agreement was
not performed in accordance with its specified terms or was otherwise breached.
It is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions hereof in any court of competent jurisdiction, this
being in addition to any other remedy to which they are entitled at law or in
equity.
 
    10.11  CERTAIN DEFINITIONS. As used in this Agreement:
 
    (a)  except as provided in SECTION 4.14, the term "AFFILIATE," as applied to
any person, shall mean any other person directly or indirectly controlling,
controlled by, or under common control with, that person; for purposes of this
definition, "CONTROL" (including, with correlative meanings, the terms
"CONTROLLING," "CONTROLLED BY" and "UNDER COMMON CONTROL WITH"), as applied to
any person, means the possession, directly or indirectly, of the power to direct
or cause the direction of the management and policies of that person, whether
through the ownership of voting securities, by contract or otherwise;
 
    (b)  a person will be deemed to "BENEFICIALLY" own securities if such person
would be the beneficial owner of such securities under Rule 13d-3 under the
Exchange Act, including securities which such person has the right to acquire
(whether such right is exercisable immediately or only after the passage of
time);
 
    (c)  the term "BUSINESS DAY" means a day other than Saturday, Sunday or any
day on which banks located in the Massachusetts or London, England are
authorized or obligated to close;
 
    (d)  the term "KNOWLEDGE" or any similar formulation of "KNOWLEDGE" shall
mean, with respect to any party hereto, the actual knowledge after due inquiry
of the executive officers of Parent and its Subsidiaries or the Company and its
Subsidiaries, respectively, set forth in SECTION 10.11(D) of the Parent
Disclosure Letter or SECTION 10.11(D) of the Company Disclosure Letter;
PROVIDED, THAT as used in SECTION 4.13 the term "knowledge" shall also include
the knowledge of the environmental, health and safety personnel of the Company;
 
    (e)  the term "PERSON" shall include individuals, corporations,
partnerships, trusts, limited liability companies, other entities and groups
(which term shall include a "group" as such term is defined in Section 13(d)(3)
of the Exchange Act);
 
    (f)  the "REPRESENTATIVES of any entity shall have the same meaning as set
forth in the Confidentiality Agreement;
 
                                      A-40
<PAGE>
    (g)  the term "SUBSIDIARY" means, with respect to the Company, any
corporation or other entity, whether incorporated or unincorporated, in which
such party directly or indirectly owns at least a majority of the voting power
represented by the outstanding capital stock or other voting securities or
interests having voting power under ordinary circumstances to elect a majority
of the directors or similar members of the governing body, or otherwise to
direct the management and policies, or such corporation or entity and with
respect to Parent, any body corporate which is a subsidiary or subsidiary
undertaking, in each case within the meaning of the Companies Act.
 
    10.12  COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument and will become effective
when one or more counterparts have been signed by each party and delivered to
the other parties.
 
    10.13  WAIVER OF JURY TRIAL. EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST
EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN
ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS
AGREEMENT OR THE TRANSACTION CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT,
TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A) CERTIFIES THAT NO
REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY
OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK
TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER
PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.
 
                                      A-41
<PAGE>
    IN WITNESS WHEREOF, each party hereto has caused this Agreement to be signed
by its officer thereunto duly authorized as of the date first above written.
 
<TABLE>
<S>                             <C>  <C>
                                THE NATIONAL GRID GROUP PLC
 
                                By:  /s/    DAVID H. JONES
                                     ------------------------------------------
                                     Name: David H. Jones
                                     Title:  Chief Executive Officer
 
                                IOSTA LLC
 
                                By:  /s/    CLARE PHELAN
                                     ------------------------------------------
                                     Name: Clare Phelan
                                     Title:  Manager and Vice President
 
                                NEW ENGLAND ELECTRIC SYSTEM
 
                                By:  /s/    RICHARD P. SERGEL
                                     ------------------------------------------
                                     Name: Richard P. Sergel
                                     Title:  President and Chief Executive
                                     Officer
 
                                By:  /s/    MICHAEL E. JESANIS
                                     ------------------------------------------
                                     Name: Michael E. Jesanis
                                     Title:  Senior Vice President and Chief
                                     Financial Officer
</TABLE>
 
The name "New England Electric System" means the trustee or trustees for the
time being (as trustee or trustees but not personally) under an Agreement and
Declaration of Trust dated January 2, 1996, as amended, which is hereby referred
to, and a copy of which, as amended, has been filed with the Secretary of the
Commonwealth of Massachusetts. Any agreement, obligation, or liability made,
entered into, or incurred by or on behalf of New England Electric System binds
only its trust estate, and no shareholder, director, trustee, officer, or agent
thereof assumes or shall be held to any liability therefor.
 
                                      A-42
<PAGE>
                                   APPENDIX B
 
                                [LOGO]
 
                                                    March 26, 1999
 
Board of Directors
New England Electric System
25 Research Drive
Westborough, MA 01582
 
Members of the Board of Directors:
 
    New England Electric System (the "Company"), The National Grid Group plc
(the "Acquiror") and NGG Holdings LLC, a newly formed limited liability company
formerly known as Iosta LLC that is directly and/or indirectly wholly-owned by
the Acquiror (the "Acquisition Sub"), have entered into an Agreement and Plan of
Merger, dated as of December 11, 1998 (the "Agreement"), pursuant to which the
Acquisition Sub will be merged with the Company in a merger (the "Merger") in
which each outstanding share of the Company's common stock, par value $1.00 per
share (the "Company Shares"), will be converted into the right to receive $53.75
per share in cash, subject to increase as set forth in the Agreement (the
"Consideration").
 
    You have asked us whether, in our opinion, the Consideration to be received
by the holders of the Company Shares pursuant to the Merger is fair from a
financial point of view to such holders.
 
    In arriving at the opinion set forth below, we have, among other things:
 
    (1) Reviewed certain publicly available business and financial information
       relating to the Company and Eastern Utilities Associates ("EUA") that we
       deemed to be relevant;
 
    (2) Reviewed certain information, including financial forecasts, relating to
       the business, earnings, cash flow, assets, liabilities and prospects of
       the Company, both on a stand-alone basis and on a pro forma basis
       assuming the consummation of the EUA Merger (as defined herein),
       furnished to us by the Company and EUA, as the case may be, as well as
       the amount and timing of the cost savings and related expenses and
       synergies expected to result from the EUA Merger (the "EUA Expected
       Synergies") furnished to us by the Company and EUA;
 
    (3) Conducted discussions with members of senior management of the Company
       and EUA concerning the matters described in clauses 1 and 2 above, as
       well as the business and prospects of the Company, with and without
       giving effect to the EUA Merger and the EUA Expected Synergies;
 
    (4) Reviewed the market prices and valuation multiples for the Company
       Shares and compared them with those of certain publicly traded companies
       that we deemed to be relevant;
 
    (5) Reviewed the results of operations of the Company and compared them with
       those of certain publicly traded companies that we deemed to be relevant;
 
                                      B-1
<PAGE>
    (6) Compared the proposed financial terms of the Merger with the financial
       terms of certain other transactions that we deemed to be relevant;
 
    (7) Participated in certain discussions and negotiations among
       representatives of the Company, the Acquiror, EUA and their financial and
       legal advisors;
 
    (8) Reviewed the Agreement;
 
    (9) Reviewed the terms and conditions of the Agreement and Plan of Merger,
       dated as of February 1, 1999 (the "EUA Agreement"), by and among the
       Company, Research Drive LLC ("LLC") and EUA pursuant to which LLC will be
       merged with EUA and EUA will thereby become a wholly-owned subsidiary of
       the Company (the "EUA Merger"); and
 
    (10) Reviewed such other financial studies and analyses and took into
       account such other matters as we deemed necessary, including our
       assessment of general economic, market and monetary conditions.
 
    In preparing our opinion, we have assumed that if the EUA Merger is
consummated, it will be consummated in accordance with the terms and conditions
of the EUA Agreement.
 
    In preparing our opinion, we have assumed and relied on the accuracy and
completeness of all information supplied or otherwise made available to us,
discussed with or reviewed by or for us, or publicly available, and we have not
assumed any responsibility for independently verifying such information or
undertaken an independent evaluation or appraisal of any of the assets or
liabilities of the Company or EUA or been furnished with any such evaluation or
appraisal. In addition, we have not assumed any obligation to conduct any
physical inspection of the properties or facilities of the Company or EUA. With
respect to the financial forecast information and the EUA Expected Synergies
furnished to or discussed with us by the Company or EUA, we have assumed that
they have been reasonably prepared and reflect the best currently available
estimates and judgment of the Company's or EUA's management as to the expected
future financial performance of the Company or EUA, as the case may be, and the
EUA Expected Synergies.
 
    Our opinion is necessarily based upon market, economic and other conditions
as they exist and can be evaluated on, and on the information made available to
us as of, the date hereof. With your consent, we have assumed that all necessary
regulatory consents and approvals for the Merger will be obtained and that in
the course of obtaining such consents and approvals, no restrictions will be
imposed that will have a material adverse effect on the parties or that will
materially impair the ability of the parties to complete the Merger or the
transactions contemplated thereby.
 
    We are acting as financial advisor to the Company in connection with the
Merger and will receive a fee from the Company for our services, a significant
portion of which is contingent upon the consummation of the Merger. In addition,
the Company has agreed to indemnify us for certain liabilities arising out of
our engagement. We are currently providing financial advisory services to the
Company in connection with the pending EUA Merger, and have, in the past,
provided financial advisory and financing services to the Company and/or its
affiliates and may continue to do so and have received, and may receive, fees
for the rendering of such services. In addition, in the ordinary course of our
business, we may actively trade the Company Shares and other securities of the
Company and the shares of common stock of EUA and other securities of EUA, as
well as securities of the Acquiror, for our own account and for the accounts of
customers and, accordingly, may at any time hold a long or short position in
such securities.
 
    This opinion is for the use and benefit of the Board of Directors of the
Company. Our opinion does not address the merits of the underlying decision by
the Company to engage in the Merger and does not constitute a recommendation to
any shareholder as to how such shareholder should vote on the proposed Merger or
any matter related thereto.
 
                                      B-2
<PAGE>
    On the basis of and subject to the foregoing, we are of the opinion that, as
of the date hereof, the Consideration to be received by the holders of the
Company Shares pursuant to the Merger is fair from a financial point of view to
the holders of such shares.
 
                                        Very truly yours,
 
                                        MERRILL LYNCH, PIERCE, FENNER & SMITH
 
                                                       INCORPORATED
 
                                      B-3
<PAGE>
                                   APPENDIX C
 
                 TEXT SHOWING CHANGES PROPOSED TO THE AGREEMENT
                            AND DECLARATION OF TRUST
 
- -Bracketed text to be deleted, underlined text to be added.-
 
ARTICLE 58
 
58. In case these trusts shall be terminated or in the case of any merger
    approved pursuant to Section 59B or in the case any of the terms, powers and
    provisions herein contained shall be altered, amended, added to or rescinded
    pursuant to the provisions of Article 57, a certificate in any number of
    counterparts deemed desirable, setting forth such termination or merger,
    alteration, amendment, addition or rescission and that the Board of
    Directors and Shareholders have authorized the same in accordance with the
    provisions of [said] Article 57 or Article 59B, as applicable, shall be
    signed by two of the Directors and by the secretary or any assistant
    secretary, and shall be acknowledged by one of the Directors and one
    counterpart of said certificate shall be filed with the Trustee and other
    counterparts thereof shall be recorded or filed at the principal office of
    these trusts and in such places as may be required by law.
 
ARTICLE 59B (NEW)
 
59B._Merger. Except as provided in Article 59A above, the Board of Directors by
    two-thirds vote may cause a domestic limited liability company to be merged
    into these trusts in accordance with Chapters 156C (Massachusetts Limited
    Liability Company Act) and 182 (Voluntary Associations and Certain Trusts)
    of the Massachusetts General Laws, if such merger has been authorized by
    vote, at a meeting duly called for the purpose upon at least twenty days'
    prior notice, of a majority of the shares outstanding and entitled to vote
    thereon at such meeting. Any such merger shall become effective only upon
    presentation to the Trustee, as required by Article 58, of the counterpart
    of the certificate referred to in Article 58, or at such later time as may
    be specified in the certificate. In respect to any such merger, the holders
    of all shares of the Company who dissent from such transaction within the
    time and in the manner provided in the Massachusetts statute applicable to
    business corporations, shall have substantially those rights they would have
    if these trusts and such limited liability company were at the time
    Massachusetts business corporations. Such rights shall be the Shareholders'
    exclusive remedy in respect of such holders' dissent from any such actions.
 
                                      C-1
<PAGE>
                       This page intentionally left blank
 
                                      C-2
<PAGE>
                                   APPENDIX D
 
            RIGHTS AND DUTIES OF NEES AND ANY OBJECTING SHAREHOLDER
      WHO HAS COMPLIED WITH THE REQUIREMENTS OF SECTION 87 OF CHAPTER 156B
                       OF THE MASSACHUSETTS GENERAL LAWS.
 
    NOTE: Sections 87-98 of Chapter 156B of the Massachusetts General Laws deal
with appraisal rights for stockholders of Massachusetts business corporations.
If Proposal 1 is adopted, the NEES Agreement and Declaration of Trust will be
amended to provide that NEES shareholders will have the same appraisal rights in
the event of a merger as the stockholders of a Massachusetts business
corporation. Thus although Sections 87-98 refer to "corporation" and
"stockholder", they shall also apply to NEES and its shareholders in the event
that the amendment to the NEES Agreement and Declaration of Trust and the merger
are approved. Thus reference to "corporation" and "stockholder" should be read
as "Trust" and "shareholder".
 
    Set forth below is the text of Sections 87 through 98 of Chapter 156B of the
Massachusetts General Laws.
 
87 STATEMENT OF RIGHTS OF OBJECTING SHAREHOLDERS IN NOTICE OF MEETING; FORM
 
    The notice of the meeting of stockholders at which the approval of such
proposed action is to be considered shall contain a statement of the rights of
objecting stockholders. The giving of such notice shall not be deemed to create
any rights in any stockholder receiving the same to demand payment for his
stock, and the directors may authorize the inclusion in any such notice of a
statement of opinion by the management as to the existence or non-existence of
the right of the stockholders to demand payment for their stock on account of
the proposed corporate action. The notice may be in such form as the directors
or officers calling the meeting deem advisable, but the following form of notice
shall be sufficient to comply with this section:
 
    "If the action proposed is approved by the stockholders at the meeting and
effected by the corporation, any stockholder (1) who files with the corporation
before the taking of the vote on the approval of such action, written objection
to the proposed action stating that he intends to demand payment for his shares
if the action is taken and (2) whose shares are not voted in favor of such
action has or may have the right to demand in writing from the corporation (or,
in the case of a consolidation or merger, the name of the resulting or surviving
corporation shall be inserted), within twenty days after the date of mailing to
him of notice in writing that the corporate action has become effective, payment
for his shares and an appraisal of the value thereof. Such corporation and any
such stockholder shall in such cases have the rights and duties and shall follow
the procedure set forth in sections 88 to 98, inclusive, of Chapter 156B of the
General Laws of Massachusetts."
 
88 NOTICE OF EFFECTIVENESS OF ACTION OBJECTED TO
 
    The corporation taking such action, or in the case of a merger or
consolidation the surviving or resulting corporation, shall, within ten days
after the date on which such corporate action became effective, notify each
stockholder who filed written objection meeting the requirements of section
eighty-six and whose shares were not voted in favor of the approval of such
action, that the action approved at the meeting of the corporation of which he
is a stockholder has become effective. The giving of such notice shall not be
deemed to create any rights in any stockholder receiving the same to demand
payment for his stock. The notice shall be sent by registered or certified mail,
addressed to the stockholder at his last known address as it appears in the
records of the corporation.
 
                                      D-1
<PAGE>
89 DEMAND FOR PAYMENT; TIME FOR PAYMENT
 
    If within twenty days after the date of mailing of a notice under subsection
(e) of section eighty-two, subsection (f) of section eight-three, or section
eighty-eight, any stockholder to whom the corporation was required to give such
notice shall demand in writing from the corporation taking such action, or in
the case of a consolidation or merger from the resulting or surviving
corporation, payment for his stock, the corporation upon which such demand is
made shall pay to him the fair value of his stock within thirty days after the
expiration of the period during which such demand may be made.
 
90 DEMAND FOR DETERMINATION OF VALUE; BILL IN EQUITY; VENUE
 
    If during the period of thirty days provided for in section eighty-nine the
corporation upon which such demand is made and any such objecting stockholder
fail to agree as to the value of such stock, such corporation or any such
stockholder may within four months after the expiration of such thirty-day
period demand a determination of the value of the stock of all such objecting
stockholders by a bill in equity filed in the superior court in the county where
the corporation in which such objecting stockholder held stock had or has its
principal office in the commonwealth.
 
91 PARTIES TO SUIT TO DETERMINE VALUE; SERVICE
 
    If the bill is filed by the corporation, it shall name as parties respondent
all stockholders who have demanded payment for their shares and with whom the
corporation has not reached agreement as to the value thereof. If the bill is
filed by a stockholder, he shall bring the bill in his own behalf and in behalf
of all other stockholders who have demanded payment for their shares and with
whom the corporation has not reached agreement as to the value thereof, and
service of the bill shall be made upon the corporation by subpoena with a copy
of the bill annexed. The corporation shall file with its answer a duly verified
list of all such other stockholders, and such stockholders shall thereupon be
deemed to have been added as parties to the bill. The corporation shall give
notice in such form and returnable on such date as the court shall order to each
stockholder party to the bill by registered or certified mail, addressed to the
last known address of such stockholder as shown in the records of the
corporation, and the court may order such additional notice by publication or
otherwise as it deems advisable. Each stockholder who makes demand as provided
in section eighty-nine shall be deemed to have consented to the provisions of
this section relating to notice, and the giving of notice by the corporation to
any such stockholder in compliance with the order of the court shall be a
sufficient service of process on him. Failure to give notice to any stockholder
making demand shall not invalidate the proceedings as to other stockholders to
whom notice was properly given, and the court may at any time before the entry
of a final decree make supplementary orders of notice.
 
92 DECREE DETERMINING VALUE AND ORDERING PAYMENT; VALUATION DATE
 
    After hearing the court shall enter a decree determining the fair value of
the stock of those stockholders who have become entitled to the valuation of and
payment for their shares, and shall order the corporation to make payment of
such value, together with interest, if any, as hereinafter provided, to the
stockholders entitled thereto upon the transfer by them to the corporation of
the certificates representing such stock if certificated or, if uncertificated,
upon receipt of an instruction transferring such stock to the corporation. For
this purpose, the value of the shares shall be determined as of the day
preceding the date of the vote approving the proposed corporate action and shall
be exclusive of any element of value arising from the expectation or
accomplishment of the proposed corporate action.
 
                                      D-2
<PAGE>
93 REFERENCE TO SPECIAL MASTER
 
    The court in its discretion may refer the bill or any question arising
thereunder to a special master to hear the parties, make findings and report the
same to the court, all in accordance with the usual practice in suits in equity
in the superior court.
 
94 NOTATION ON STOCK CERTIFICATES OF PENDENCY OF BILL
 
    On motion the court may order stockholder parties to the bill to submit
their certificates of stock to the corporation for notation thereon of the
pendency of the bill, and may order the corporation to note such pendency in its
records with respect to any uncertificated shares held by such stockholder
parties, and may on motion dismiss the bill as to any stockholder who fails to
comply with such order.
 
95 COSTS; INTEREST
 
    The costs of the bill, including the reasonable compensation and expenses of
any master appointed by the court, but exclusive of fees of counsel or of
experts retained by any party, shall be determined by the court and taxed upon
the parties to the bill, or any of them, in such manner as appears to be
equitable, except that all costs of giving notice to stockholders as provided in
this Chapter shall be paid by the corporation. Interest shall be paid upon any
award from the date of the vote approving the proposed corporate action, and the
court may on application of any interested party determine the amount of
interest to be paid in the case of any stockholder.
 
96 DIVIDENDS AND VOTING RIGHTS AFTER DEMAND FOR PAYMENT
 
    Any stockholder who has demanded payment for his stock as provided in this
Chapter shall not thereafter be entitled to notice of any meeting of
stockholders or to vote such stock for any purpose and shall not be entitled to
the payment of dividends or other distribution on the stock (except dividends or
other distributions payable to stockholders of record at a date which is prior
to the date of the vote approving the proposed corporate action) unless:
 
    (1) A bill shall not be filed within the time provided in section ninety;
 
    (2) A bill, if filed, shall be dismissed as to such stockholder; or
 
    (3) Such stockholder shall with the written approval of the corporation, or
       in the case of a consolidation or merger, the resulting or surviving
       corporation, deliver to it a written withdrawal of his objections to and
       an acceptance of such corporate action.
 
    Notwithstanding the provisions of clauses (1) to (3), inclusive, said
stockholder shall have only the rights of a stockholder who did not so demand
payment for his stock as provided in this Chapter.
 
97 STATUS OF SHARES PAID FOR
 
    The shares of the corporation paid for by the corporation pursuant to the
provisions of this Chapter shall have the status of treasury stock, or in the
case of a consolidation or merger the shares or the securities of the resulting
or surviving corporation into which the shares of such objecting stockholder
would have been converted had he not objected to such consolidation or merger
shall have the status of treasury stock or securities.
 
98 EXCLUSIVE REMEDY; EXCEPTION
 
    The enforcement by a stockholder of his right to receive payment for his
shares in the manner provided in this Chapter shall be an exclusive remedy
except that this Chapter shall not exclude the right of such stockholder to
bring or maintain an appropriate proceeding to obtain relief on the ground that
such corporate action will be or is illegal or fraudulent as to him.
 
                                      D-3
<PAGE>
                                                                      APPENDIX E
 
                                    FORM OF
                              EMPLOYMENT AGREEMENT
                               RICHARD P. SERGEL
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                            -----------
<S>                                                                                                         <C>
Employment Period.........................................................................................         E-1
 
Position and Duties.......................................................................................         E-1
 
Compensation..............................................................................................         E-2
 
Termination of Employment.................................................................................         E-3
 
Obligations of the Company upon Termination...............................................................         E-5
 
Non-Exclusivity of Rights.................................................................................         E-8
 
Full Settlement...........................................................................................         E-8
 
Non-Competition Provision and Confidential Information....................................................         E-8
 
Certain Additional Payments by the Company................................................................         E-9
 
Attorneys' Fees...........................................................................................        E-11
 
Successors................................................................................................        E-11
 
Miscellaneous.............................................................................................        E-11
</TABLE>
 
                                      E-i
<PAGE>
                              EMPLOYMENT AGREEMENT
 
    THIS AGREEMENT by and between, THE NATIONAL GRID GROUP PLC, a public limited
company incorporated under the laws of England and Wales with registration
number 2367004 ("National Grid") (solely for purposes of Section 3(b)(2) below),
NEW ENGLAND ELECTRIC SYSTEM, a Massachusetts business trust (the "Company"), and
RICHARD P. SERGEL (the "Executive"), dated as of the       day of             .
 
                                WITNESSETH THAT
 
    WHEREAS, National Grid, IOSTA LLC, a Massachusetts limited liability company
directly and indirectly wholly owned by National Grid ("IOSTA"), and the
Company, have entered into an Agreement and Plan of Merger dated as of December
11, 1998 (the "Merger Agreement" and the consummation of the transactions
contemplated by the Merger Agreement, the "Merger"), whereby IOSTA shall be
merged with and into the Company, at which time the separate existence of IOSTA
will cease and the Company will continue as the surviving entity (the "Surviving
Entity"); and
 
    WHEREAS, the Company wishes to provide for the orderly succession of
management of the Company following the effective date of the Merger (the
"Effective Time"); and
 
    WHEREAS, the Company further wishes to provide for the employment by the
Company of the Executive, and the Executive wishes to serve the Company and its
affiliated entities in the capacities and on the terms and conditions set forth
in this Agreement; and
 
    WHEREAS, this Agreement is the entire agreement between the parties
concerning the subject matter hereof and supersedes all prior agreements
concerning the same subject, including the severance agreement between the
Company and the Executive, dated March 1, 1998.
 
    NOW, THEREFORE, it is hereby agreed as follows:
 
    1.  EMPLOYMENT PERIOD.
 
        (a) The Company shall employ the Executive, and the Executive shall
    serve the Company, on the terms and conditions set forth in this Agreement,
    from the Effective Time until the date which is the third (3rd) anniversary
    of the Effective Time or such later date as provided in paragraph (b) of
    this Section 1 (the "Employment Period"). This Agreement shall not be
    effective prior to the Effective Time. For all periods prior to, but not
    including, the Effective Time, the severance agreement between the Company
    and the Executive, dated March 1, 1998, shall remain in full force and
    effect.
 
        (b) The Employment Period shall be extended automatically for one
    additional day as of the second anniversary of the Effective Time and on
    each day thereafter unless and until either the Company or the Executive
    gives written notice to the other that the Employment Period shall not be so
    extended.
 
        (c) Notwithstanding the other provisions of this Section 1, any
    termination of employment by the Executive other than for Good Reason shall
    require not less than six months' written notice.
 
    2.  POSITION AND DUTIES.
 
        (a) During the Employment Period, the Executive shall serve as President
    and Chief Executive Officer of the Company. The Executive's responsibilities
    as President and Chief Executive Officer shall include all aspects of the
    Company's and its subsidiaries' businesses. The Executive shall serve in
    each such case as an employee of the Company and with such duties and
    responsibilities as are customarily assigned to such positions, and such
    other duties and responsibilities not inconsistent therewith as may from
    time to time be assigned to him by the Board. As President and Chief
    Executive Officer, the Executive shall report only to the Board. The
    Executive shall be a
 
                                      E-1
<PAGE>
    member of the Board on the first day of the Employment Period, and the Board
    shall propose the Executive for re-election to the Board throughout the
    Employment Period. In addition, and without further compensation, the
    Executive shall serve as an Executive Director of National Grid, subject to
    ratification of National Grid's shareholders, and shall serve as a director
    and/or officer of one or more of the Company's other affiliates if so
    elected or appointed from time to time.
 
        (b) During the Employment Period, and excluding any periods of vacation
    and sick leave to which the Executive is entitled, the Executive shall
    devote reasonable attention and time during normal business hours to the
    business and affairs of the Company and its affiliates, as directed by the
    Board, and, to the extent necessary to discharge the responsibilities
    assigned to the Executive under this Agreement, use the Executive's
    reasonable best efforts to carry out such responsibilities faithfully and
    efficiently. It shall not be considered a violation of the foregoing for the
    Executive to serve on corporate, industry, civic, or charitable boards or
    committees, so long as such activities do not materially interfere with the
    performance of the Executive's responsibilities as an employee of the
    Company in accordance with this Agreement.
 
        (c) The Executive's services shall be performed primarily at the
    Company's headquarters, currently in Westborough, MA.
 
    3.  COMPENSATION.  The Executive's compensation during the Employment Period
shall be determined by, and in the sole discretion of, National Grid or any
successor thereto, subject to Sections 3(a), 3(b), 3(c) and 3(d) and Sections
4(d)(iv), 5 and 9 hereof.
 
        (a) ANNUAL BASE SALARY.  During the Employment Period, the Executive
    shall receive an annual base salary of not less than $550,000 (the annual
    base salary in effect from time to time, "Annual Base Salary"). The Annual
    Base Salary shall be payable in accordance with the Company's regular
    payroll practice for its senior officers, as in effect from time to time.
    During the Employment Period, the Annual Base Salary shall be reviewed at
    least annually, shall not be less than the minimum base salary set forth
    above. Any increase in the Annual Base Salary shall not limit or reduce any
    other obligation of the Company under this Agreement.
 
        (b) INCENTIVE COMPENSATION.  (i) During the Employment Period, the
    Executive shall participate in annual bonus arrangements, the maximum
    opportunity for which shall comprise: (A) 50% of Annual Base Salary, payable
    in cash (the "Annual Cash Bonus") and (B) 60% of the Annual Cash Bonus,
    payable in phantom or similar shares of Company stock and subject to a three
    year vesting requirement and such other terms and conditions as such
    incentive plan may provide, based on Company performance goals and standards
    as determined by National Grid. The Executive shall be eligible to
    participate in the above arrangements at a level (in terms of the amount and
    types of compensation that the Executive has the opportunity to receive and
    the terms thereof) no less favorable in the aggregate than those
    arrangements which are provided to other senior officers of the Company.
 
           (ii) During the Employment Period, the Executive shall participate in
       long-term equity incentive arrangements under National Grid's Executive
       Share Option Scheme or any successor plan or scheme thereto (the
       "Scheme"), which arrangements shall provide grants to the Executive of
       options (the "National Grid Options") to acquire the common stock of
       National Grid (the "National Grid Common Stock") on the same basis as
       other National Grid directors. National Grid shall grant to the
       Executive, under the Scheme and as soon as practicable following the
       Effective Time, subject to U.K. and U.S. securities laws, a National Grid
       Option, the number of shares of National Grid Common Stock subject to
       which shall have an aggregate fair market value (determined as of the
       date of grant) equal to three times the Executive's Annual Base Salary
       (as in effect at the Effective Time). Further grants under the Scheme
       shall be made at the sole discretion of National Grid. For purposes of
       determining the number of shares of National Grid Common Stock subject to
       National Grid Options to be
 
                                      E-2
<PAGE>
       granted pursuant to the Scheme, the Executive's Annual Base Salary shall
       be converted to U.K. Sterling based on the U.S. dollar exchange rate at
       the mid-market London closing rate on the applicable date of grant, as
       quoted in the Financial Times.
 
        (c) OTHER BENEFITS.
 
           (i) Supplemental Executive Retirement Plan. During the Employment
       Period, the Executive shall participate in a supplemental executive
       retirement plan ("SERP") such that the aggregate value of the retirement
       benefits that he and his spouse will receive at the end of the Employment
       Period under all defined benefit plans of the Company and its affiliates
       (whether qualified or not) will be not less than the aggregate value of
       the benefits he and his spouse would have received (and with the same
       forms of benefit payments) had he continued, through the end of the
       Employment Period, to accrue the supplemental retirement benefits
       provided by the terms of the Supplemental Retirement Income Plan of the
       Company as in effect immediately before the Effective Time.
 
           (ii) Without limiting the generality of the foregoing, during the
       Employment Period and thereafter, except to the extent the Executive is
       already covered under another National Grid-provided or employer-provided
       arrangement providing substantially similar payments or benefits: (A) the
       Executive shall be entitled to participate in all applicable incentive,
       savings and retirement plans, practices, policies and programs of the
       Company and its subsidiaries to the same extent as other senior officers
       of the Company; and (B) the Executive and/or the Executive's family, as
       the case may be, shall be eligible for participation in, and shall
       receive all benefits under, all applicable welfare benefit plans,
       practices, policies and programs provided by the Company and its
       subsidiaries, including, without limitation, medical, prescription,
       dental, disability, sick leave, employee life insurance, group life
       insurance, accidental death and travel accident insurance plans and
       programs, to the same extent as other senior officers of the Company;
       provided, however, except as may be expressly set forth elsewhere in this
       Agreement, nothing contained in this section or any other section of this
       Agreement shall entitle the Executive to receive duplicate or multiple
       payments or benefits under the same plan or arrangement.
 
        (b) FRINGE BENEFITS.  During the Employment Period, the Executive shall
    be entitled to receive fringe benefits substantially similar to those
    enjoyed by the Executive immediately prior to the Effective Time and shall
    be entitled to participate in the vacation policy of the Company and avail
    himself of paid holidays (as determined from time to time by the Company) on
    the same terms and conditions as other senior officers of the Company.
 
    4.  TERMINATION OF EMPLOYMENT.
 
        (a) DEATH OR DISABILITY.  The Executive's employment shall terminate
    automatically upon the Executive's death during the Employment Period. The
    Company shall be entitled to terminate the Executive's employment because of
    the Executive's Disability during the Employment Period in accordance with
    the Company's long-term disability plan as in effect immediately prior to
    the Effective Date.
 
        (b) BY THE COMPANY.
 
           (i) The Company may terminate the Executive's employment during the
       Employment Period for Cause or without Cause.
 
           (ii) "Cause" means: (A) the willful and continued failure by the
       Executive to substantially perform the Executive's duties hereunder
       (other than any such failure resulting from the Executive's incapacity
       due to physical or mental illness or any such actual or anticipated
       failure after the issuance of a Notice of Termination for Good Reason by
       the Executive
 
                                      E-3
<PAGE>
       pursuant to Section 4(d)) after a written demand for substantial
       performance is delivered to the Executive by the Board, which demand
       specifically identifies the manner in which the Board believes that the
       Executive has not substantially performed the Executive's duties, or (B)
       the willful engaging by the Executive in conduct which is demonstrably
       and materially injurious to the Company and its affiliates taken as a
       whole, monetarily or otherwise. For purposes of the foregoing, no act, or
       failure to act, on the Executive's part shall be deemed "willful" unless
       done, or omitted to be done, by the Executive not in good faith and
       without reasonable belief that the Executive's act, or failure to act,
       was in the best interest of the Company.
 
        (c) BY THE EXECUTIVE.
 
           (i) The Executive may terminate employment for Good Reason or, upon
       six months' prior written notice, without Good Reason.
 
           (ii) "Good Reason" means the occurrence (without the Executive's
       express written consent) of any one of the following acts by the Company,
       or failures by the Company to act, unless, in the case of any act or
       failure to act described in paragraph (A), (B), (C) or (D) below, such
       act or failure to act is corrected within thirty days of the Notice of
       Termination given in respect thereof:
 
               (A) the assignment to the Executive of duties substantially
           inconsistent with the Executive's status as a senior officer of the
           Company or the duties described in Section 2(a) above;
 
               (B) a reduction in the Executive's Annual Base Salary or any
           breach by the Company or National Grid of their respective
           obligations under Sections 3(b), 3(c) and 3(d) above;
 
               (C) the Company requiring the Executive's principal place of
           employment to be anywhere other than at the Company's headquarters,
           wherever such headquarters may be located from time to time, or the
           relocation of the Company's headquarters to a location more than 150
           miles from Westborough, Massachusetts; or
 
               (D) any purported termination of the Executive's employment which
           is not effected pursuant to a Notice of Termination satisfying the
           requirements of Section 4(d); for purposes of this Agreement, no such
           purported termination shall be effective.
 
    The Executive's right to terminate his employment for Good Reason shall not
be affected by the Executive's incapacity due to physical or mental illness.
Except as provided below, the Executive's continued employment shall not
constitute consent to, or a waiver of rights with respect to, any act or failure
to act constituting Good Reason hereunder. No such event described hereunder
shall constitute Good Reason unless the Executive has given written notice to
the Company specifying the event relied upon for such termination within one
year (but in no event beyond the term of this Agreement) from the occurrence of
such event.
 
        (d) TERMINATION PROCEDURES AND COMPENSATION DURING DISPUTE.
 
           (i) NOTICE OF TERMINATION.  Any purported termination of the
       Executive's employment (other than by reason of death) shall be
       communicated by written Notice of Termination from one party hereto to
       the other party hereto in accordance with Section 12(b) hereof. For
       purposes of this Agreement, a "Notice of Termination" shall mean a notice
       which shall indicate the specific termination provision in this Agreement
       relied upon and shall set forth in reasonable detail the facts and
       circumstances claimed to provide a basis for termination of the
       Executive's employment under the provision so indicated.
 
                                      E-4
<PAGE>
               A. TERMINATIONS FOR CAUSE.  A Notice of Termination for Cause
           shall also include a copy of a resolution duly adopted by the
           affirmative vote of not less than three-quarters ( 3/4) of the entire
           membership of the Board (excluding, for this purpose, the Executive
           if a Board member) (after reasonable notice to the Executive and an
           opportunity for the Executive, together with the Executive's counsel,
           to be heard before the Board) finding that, in the good faith opinion
           of the Board, the Executive was guilty of conduct set forth in the
           definition of Cause herein, and specifying the particulars thereof in
           detail.
 
               B.  TERMINATION FOR GOOD REASON.  A Notice of Termination for
           Good Reason shall specify in reasonable detail the specific
           provision(s) in this Agreement and the event(s) relied upon as the
           basis for such termination.
 
           (ii) DATE OF TERMINATION.  Except as otherwise provided in Section
       11(c) of this Agreement, "Date of Termination", with respect to any
       purported termination of the Executive's employment during the Employment
       Period, shall mean (A) if the Executive's employment is terminated for
       Disability, thirty (30) days after Notice of Termination is given
       (provided that the Executive shall not have returned to the full-time
       performance of the Executive's duties during such thirty (30) day
       period), and (B) if the Executive's employment is terminated for any
       other reason, the date specified in the Notice of Termination (which, in
       the case of a termination by the Company for other than Cause, shall not
       be less than thirty (30) days and, in the case of a termination by the
       Executive other than for Good Reason, shall not be less than six (6)
       months, from the date such Notice of Termination is given).
 
           (iii) DISPUTE CONCERNING TERMINATION.  If within fifteen (15) days
       after any Notice of Termination is given by the Executive for Good Reason
       under Section 4(c)(ii)(A) above ("Special Good Reason"), the Company
       notifies the Executive that a dispute exists concerning the termination,
       the Date of Termination shall be the date on which the dispute is finally
       resolved, either by mutual written agreement of the parties or by a final
       judgment, order or decree of a court of competent jurisdiction (which is
       not appealable or with respect to which the time for appeal therefrom has
       expired and no appeal has been perfected).
 
           (iv) COMPENSATION DURING DISPUTE.  If a Special Good Reason
       termination is disputed in accordance with Section 4(d)(iii), the Company
       shall pay the Executive the full compensation in effect when the notice
       giving rise to such dispute was given (including, but not limited to,
       Annual Base Salary) and continue the Executive as a participant in all
       compensation, benefit and insurance plans in which the Executive was
       participating when the notice giving rise to the dispute was given, until
       the Date of Termination, as determined in accordance with Section
       4(d)(iii). Amounts paid under this Section 4(d)(iv) are in addition to
       all other amounts due under this Agreement and shall not be offset
       against or reduce any other amounts due under this Agreement.
 
           (v) NO WAIVER.  The failure to set forth any fact or circumstance in
       a Notice of Termination shall not constitute a waiver of the right to
       assert, and shall not preclude the party giving notice from asserting,
       such fact or circumstance in an attempt to enforce any right under or
       provision of this Agreement.
 
    5.  OBLIGATIONS OF THE COMPANY UPON TERMINATION.
 
        (a) BY THE COMPANY OTHER THAN FOR CAUSE, DEATH OR DISABILITY, OR BY THE
    EXECUTIVE FOR GOOD REASON.
 
           (i) If, during the Employment Period, the Company terminates the
       Executive's employment, other than for Cause, death, or Disability, or
       the Executive terminates his employment for Good Reason, the Company
       shall: (A) pay the Executive the Accrued Obligations (as defined in
       Section 5(b) below) in a lump sum cash payment within five (5) business
       days of
 
                                      E-5
<PAGE>
       the Date of Termination; (B) pay the Executive the amounts the Executive
       would have earned under paragraphs (a) and (b)(i) of Section 3 (other
       than stock options) as if he had remained employed through the end of the
       Severance Period (as defined below) in a lump sum cash payment within
       five (5) business days of the Date of Termination and (C) continue to
       provide the Executive with the compensation and benefits set forth in
       paragraphs (c) and (d) of Section 3 as if he had remained employed by the
       Company pursuant to this Agreement (x) for a period of 36 months, if such
       termination of employment occurs prior to the second anniversary of the
       Effective Time or within 2 years following a Change in Control or (y) for
       a period of 18 months, if such termination of employment occurs following
       the second anniversary of the Effective Time and either prior to a Change
       in Control or more than 2 years following a Change in Control and, in
       either such case, the Executive had then terminated employment with
       whatever rights and benefits would have been available to Executive at
       that date (the period described in (x) or (y) above, as applicable, the
       "Severance Period"); PROVIDED, however, that for purposes of the
       foregoing, the Executive shall be deemed to earn, during each year in
       such period, a bonus under Section 3(b)(i) equal to the greater of the
       average bonus earned by the Executive under all incentive compensation
       plans of the Company in the three years preceding the Effective Time or
       the three years preceding the Date of Termination; PROVIDED further,
       however, that to the extent any benefits described in paragraphs (b), (c)
       and (d) of Section 3 cannot be provided pursuant to the plan or program
       maintained by the Company for its executives, the Company shall provide
       such benefits outside such plan or program at no additional cost
       (including, without limitation, tax costs) to the Executive and his
       family; and PROVIDED further, that during any period when the Executive
       is eligible to receive benefits of the type described in clause (B) of
       paragraph (c)(ii) of Section 3 under another employer-provided plan, the
       benefits provided by the Company under this paragraph (a) of Section 5
       may be made secondary to those provided under such other plan. In
       addition to the foregoing, any restrictions on restricted stock
       outstanding on the Date of Termination shall lapse as of the Date of
       Termination without regard to the termination of the Executive's
       employment, any outstanding incentive compensation awards with vesting
       and/or payment contingent upon attainment of individual, Company, or
       affiliate performance goals shall, for purposes of awards considered
       short term by National Grid, be deemed satisfied at 90% of "Maximum"
       level and paid, in a lump sum cash payment within five (5) days of the
       Date of Termination, prorata for the portion of the performance year
       through the Date of Termination and all National Grid Options outstanding
       as of the Date of Termination under the Scheme shall be governed by the
       terms of the Scheme. The payments and benefits provided pursuant to this
       paragraph (a) of Section 5 are intended as liquidated damages for a
       termination of the Executive's employment by the Company other than for
       Cause, death, or Disability or for the actions of the Company leading to
       a termination of the Executive's employment by the Executive for Good
       Reason, and shall be the sole and exclusive remedy therefor.
 
           (ii) For purposes of this Agreement, "Change in Control" shall mean:
 
               A. any person (as such term is used in Section 13(d) of the
           Securities Exchange Act of 1934 (the "Act"), excluding a corporation
           at least 80% of the ownership of which after acquiring its interest
           is owned directly by the holder of common stock of the Company
           immediately prior to such acquisition ("Person")), is the beneficial
           owner, directly or indirectly, of 20% or more of the outstanding
           stock of the Company requiring the filing of a report with the
           Securities and Exchange Commission under Section 13(d) of the 1934
           Act; or
 
                                      E-6
<PAGE>
               B.  National Grid ceases to be the beneficial owner (within the
           meaning of Rule 13d-3 under the Exchange Act) of more than 60% of the
           combined voting power of the voting securities of the Company; or
 
               C.  the stockholders of the Company approve a plan of complete
           liquidation or dissolution of the Company or there is consummated an
           agreement for the sale or disposition by the Company of all or
           substantially all of the Company's assets, other than a sale or
           disposition by the Company of all or substantially all of the
           Company's assets to an entity, more than 50% of the combined voting
           power of the voting securities of which are owned by National Grid;
           or
 
               D. the acquisition by National Grid, The Company, the Surviving
           Entity or any of their affiliates, whether by purchase, merger or
           otherwise, of any regulated utility company, the primary place of
           business of which is in the United States, for a purchase price in
           excess of $1.5 billion; or
 
               E.  any Person, other than a Person who beneficially owns more
           than 10% of the outstanding stock of National Grid at the Effective
           Time, becomes the beneficial owner, directly or indirectly, of 30% or
           more of the outstanding stock of National Grid.
 
    In no event shall the Merger or any transaction contemplated by the Merger
Agreement constitute a Change in Control for purposes of this Agreement.
 
        (b) DEATH OR DISABILITY.  If the Executive's employment is terminated by
    reason of the Executive's death or Disability during the Employment Period,
    the Company shall pay to the Executive or, in the case of the Executive's
    death, to the Executive's designated beneficiaries (or, if there is no such
    beneficiary, to the Executive's estate or legal representative) in a lump
    sum in cash within 30 days after the Date of Termination, the sum of the
    following amounts (the "Accrued Obligations"): (i) any portion of the
    Executive's Annual Base Salary through the Date of Termination that has not
    yet been paid; (ii) in respect of incentives awarded under Section 3(b)(i)
    of this Agreement, an amount representing the target Incentive Compensation
    for the year that would otherwise vest and/or become payable within the year
    in which the Date of Termination occurs, computed by assuming that the
    amount of all such target Incentive Compensation would be equal to the
    amount of such target Incentive Compensation that the Executive would have
    been eligible to earn for such period, and multiplying that amount by a
    fraction, the numerator of which is the number of days in such period
    through the Date of Termination, and the denominator of which is the total
    number of days in the relevant period and incentives under the Scheme shall
    be governed by the rules of the Scheme; (iii) any compensation previously
    deferred by the Executive (together with any accrued interest or earnings
    thereon) that has not yet been paid; and (iv) any accrued but unpaid
    Incentive Compensation and vacation pay; and the Company shall have no
    further obligations under this Agreement, except as specified in Section 6
    below.
 
        (c) By the Company for Cause or by the Executive other than for Good
    Reason. If the Executive's employment is terminated by the Company for Cause
    during the Employment Period, the Company shall pay the Executive the Annual
    Base Salary through the Date of Termination and the amount of any
    compensation previously deferred by the Executive (together with any accrued
    interest or earnings thereon), in each case to the extent not yet paid, and
    the Company shall have no further obligations under this Agreement, except
    as specified in Section 6 below. If the Executive voluntarily terminates
    employment during the Employment Period other than for Good Reason, the
    Company shall pay the Accrued Obligations to the Executive in a lump sum in
    cash within 30 days of the Date of Termination, and the Company shall have
    no further obligations under this Agreement, except as specified in Section
    6 below.
 
                                      E-7
<PAGE>
    6.  NON-EXCLUSIVITY OF RIGHTS.  Except as provided in Sections 1, 3, and 12
of this Agreement, nothing in this Agreement shall prevent or limit the
Executive's continuing or future participation in any plan, program, policy or
practice provided by the Company or any of its affiliated companies for which
the Executive may qualify, nor shall anything in this Agreement limit or
otherwise affect such rights as the Executive may have under any contract or
agreement with the Company or any of its affiliated companies. Vested benefits
and other amounts that the Executive is otherwise entitled to receive under any
other plan, policy, practice, or program of, or any contract or agreement with,
the Company or any of its affiliated companies on or after the Date of
Termination shall be payable in accordance with the terms of each such plan,
policy, practice, program, contract, or agreement, as the case may be, except as
explicitly modified by this Agreement.
 
    7.  FULL SETTLEMENT.  The Company's obligation to make the payments provided
for in, and otherwise to perform its obligations under, this Agreement shall not
be affected by any set-off, counterclaim, recoupment, defense or other claim,
right or action that the Company may have against the Executive or others. In no
event shall the Executive be obligated to seek other employment or take any
other action by way of mitigation of the amounts payable to the Executive under
any of the provisions of this Agreement and, except as specifically provided in
paragraph (a) of Section 5 with respect to benefits described in clause (B) of
paragraph (c)(ii) of Section 3, the amount of any payment or benefit provided
for in this Agreement shall not be reduced by any compensation earned by the
Executive as the result of employment by another employer, by retirement
benefits, by offset against any amount claimed to be owed by the Executive to
the Company, or otherwise.
 
    8.  NON-COMPETITION PROVISION AND CONFIDENTIAL INFORMATION.
 
        (a) Without prior written consent of the Company, during the period of
    the Executive's employment with the Company and for one year thereafter, the
    Executive shall not, as a shareholder, officer, director, partner,
    consultant, or otherwise, engage directly or indirectly in any business or
    enterprise which is "in competition" with the Company or its successors or
    assigns or affiliates thereof or undertake any action which would be
    injurious to the Company or its affiliates or assist the Company's or its
    affiliates' competitors; provided, however, that the Executive's ownership
    of less than five percent of the issued and outstanding voting securities of
    a publicly traded company shall not be deemed to constitute such
    competition. A business or enterprise is deemed to be "in competition" if it
    is engaged in any material business in any state of the United States in
    which the Company or any of its affiliates operates at the "applicable
    time." "Applicable time" means (i) during the period of the Executive's
    employment hereunder, the specific date, and (ii) after the Date of
    Termination, the Date of Termination.
 
        (b) The Executive shall hold in a fiduciary capacity for the benefit of
    the Company all secret or confidential information, knowledge or data
    relating to the Company or any of its affiliated companies and their
    respective businesses that the Executive obtains during the Executive's
    employment by the Company or any of its affiliated companies and that is not
    public knowledge (other than as a result of the Executive's violation of
    this Section 8) ("Confidential Information"). The Executive shall not
    communicate, divulge, or disseminate Confidential Information at any time
    during or after the Executive's employment with the Company, except with the
    prior written consent of the Company or as otherwise required by law or
    legal process. In no event shall any asserted violation of the provisions of
    this Section 8 constitute a basis for deferring or withholding any amounts
    otherwise payable to the Executive under this Agreement.
 
        (c) (i) The Executive acknowledges that if the Executive shall breach or
    threaten to breach any provision of this Section 8, the damages to the
    Company and its affiliates may be substantial, although difficult to
    ascertain, and money damages will not afford the Company and its affiliates
    an adequate remedy. Therefore, if the provisions of this Section 8 are
    violated, in whole or in part,
 
                                      E-8
<PAGE>
    the Company and its affiliates shall be entitled to specific performance and
    injunctive relief, without prejudice to other remedies the Company and/or
    its affiliates may have at law or in equity.
 
           (ii) If any term or provision of this Section 8, or the application
    thereof to any person or circumstances shall, to any extent, be invalid or
    unenforceable, the remainder of this Section 8, or the application of such
    term or provision to persons or circumstances other than those as to which
    it is held invalid or unenforceable, shall not be affected thereby, and each
    term and provision of this Section 8 shall be valid and enforceable to the
    fullest extent permitted by law. Moreover, if a court of competent
    jurisdiction deems any provision hereof to be too broad in time, scope, or
    area, it is expressly agreed that such provision shall be reformed to the
    maximum degree that would not render it unenforceable.
 
    9.  CERTAIN ADDITIONAL PAYMENTS BY THE COMPANY.
 
        (a) Anything in this Agreement to the contrary notwithstanding, in the
    event it shall be determined that any payment or distribution to or for the
    benefit of the Executive (whether paid or payable or distributed or
    distributable pursuant to the terms of this Agreement or any other plan,
    arrangement or agreement with the Company, any person whose actions result
    in a Change in Control or any Person affiliated with the Company or such
    Person, but determined without regard to any additional payments required
    under this Section 9) (a "Payment") would be subject to the excise tax
    imposed by Section 4999 of the Internal Revenue Code of 1986, as amended
    (the "Code") or any interest or penalties are incurred by the Executive with
    respect to such excise tax (such excise tax, together with any such interest
    and penalties, are hereinafter collectively referred to as the "Excise
    Tax"), then the Executive shall be entitled to receive an additional payment
    (a "Gross-Up Payment") in an amount such that after payment by the Executive
    of all taxes (including any interest or penalties imposed with respect to
    such taxes), including, without limitation, any income taxes (and any
    interest and penalties imposed with respect thereto) and Excise Tax imposed
    upon the Gross-Up Payment, the Executive retains an amount of the Gross-Up
    Payment equal to the Excise Tax imposed upon the Payments.
 
        (b) Subject to the provisions of paragraph (c) of this Section 9, all
    determinations required to be made under this Section 9, including whether
    and when a Gross-Up Payment is required and the amount of such Gross-up
    Payment and the assumptions to be utilized in arriving at such
    determination, shall be made by a nationally recognized certified public
    accounting firm designated by the Executive (the "Accounting Firm"), which
    shall provide detailed supporting calculations both to the Company and the
    Executive within 15 business days of the receipt of notice from the
    Executive that there has been a Payment, or such earlier time as is
    requested by the Company. All fees and expenses of the Accounting Firm shall
    be borne solely by the Company. Any Gross-Up Payment, as determined pursuant
    to this Section 9, shall be paid by the Company to the Executive within five
    days of the receipt of the Accounting Firm's determination. Any
    determination by the Accounting Firm shall be binding upon the Company and
    the Executive. As a result of the uncertainty in the application of Section
    4999 of the Code at the time of the initial determination by the Accounting
    Firm hereunder, it is possible that Gross-Up Payments which will not have
    been made by the Company should have been made ("Underpayment") consistent
    with the calculations required to be made hereunder. In the event that the
    Company exhausts its remedies pursuant to paragraph (c) of this Section 9
    and the Executive thereafter is required to make a payment of any Excise
    Tax, the Accounting Firm shall determine the amount of the Underpayment that
    has occurred and any such Underpayment shall be promptly paid by the Company
    to or for the benefit of the Executive.
 
        (c) The Executive shall notify the Company in writing of any claim by
    the Internal Revenue Service that, if successful, would require the payment
    by the Company of the Gross-Up Payment. Such notification shall be given as
    soon as practicable but no later than ten business days after the
 
                                      E-9
<PAGE>
    Executive is informed in writing of such claim and shall apprise the Company
    of the nature of such claim and the date on which such claim is requested to
    be paid. The Executive shall not pay such claim prior to the expiration of
    the 30-day period following the date on which it gives such notice to the
    Company (or such shorter period ending on the date that any payment of taxes
    with respect to such claim is due). If the Company notifies the Executive in
    writing prior to the expiration of such period that it desires to contest
    such claim, the Executive shall:
 
           (i) give the Company any information reasonably requested by the
       Company relating to such claim,
 
           (ii) take such action in connection with contesting such claim as the
       Company shall reasonably request in writing from time to time, including,
       without limitation, accepting legal representation with respect to such
       claim by an attorney reasonably selected by the Company,
 
           (iii) cooperate with the Company in good faith in order effectively
       to contest such claim, and
 
           (iv) permit the Company to participate in any proceedings relating to
       such claim;
 
    PROVIDED, however, that the Company shall bear and pay directly all costs
and expenses (including additional interest and penalties) incurred in
connection with such contest and shall indemnify and hold the Executive
harmless, on an after-tax basis, for any Excise Tax or income tax (including
interest and penalties with respect thereto) imposed as a result of such
representation and payment of costs and expenses. Without limitation on the
foregoing provisions of this paragraph (c) of Section 9, the Company shall
control all proceedings taken in connection with such contest and, at its sole
option, may pursue or forego any and all administrative appeals, proceedings,
hearings and conferences with the taxing authority in respect of such claim and
may, at its sole option, either direct the Executive to pay the tax claimed and
sue for a refund or contest the claim in any permissible manner, and the
Executive agrees to prosecute such contest to a determination before any
administrative tribunal, in a court of initial jurisdiction and in one or more
appellate courts, as the Company shall determine; PROVIDED, however, that if the
Company directs the Executive to pay such claim and sue for a refund, the
Company shall advance the amount of such payment to the Executive, on an
interest-free basis and shall indemnify and hold the Executive harmless, on an
after-tax basis, from any Excise Tax or income tax (including interest or
penalties with respect thereto) imposed with respect to such advance or with
respect to any imputed income with respect to such advance; and PROVIDED,
further, that any extension of the statute of limitations relating to payment of
taxes for the taxable year of the Executive with respect to which such contested
amount is claimed to be due is limited solely to such contested amount.
Furthermore, the Company's control of the contest shall be limited to issues
with respect to which a Gross-Up Payment would be payable hereunder and the
Executive shall be entitled to settle or contest, as the case may be, any other
issue raised by the Internal Revenue Service or any other taxing authority.
 
        (d) If, after the receipt by the Executive of an amount advanced by the
    Company pursuant to paragraph (c) of this Section 9, the Executive becomes
    entitled to receive any refund with respect to such claim, the Executive
    shall (subject to the Company's complying with the requirements of paragraph
    (c) of this Section 9) promptly pay to the Company the amount of such refund
    (together with any interest paid or credited thereon after taxes applicable
    thereto). If after the receipt by the Executive of an amount advanced by the
    Company pursuant to paragraph (c) of this Section 9, a determination is made
    that the Executive shall not be entitled to any refund with respect to such
    claim and the Company does not notify the Executive in writing of its intent
    to contest such denial of refund prior to the expiration of 30 days after
    such determination, then such advance shall be forgiven and shall not be
    required to be repaid and the amount of such advance shall offset, to the
    extent thereof, the amount of Gross-Up Payment required to be paid.
 
                                      E-10
<PAGE>
    10. ATTORNEYS' FEES.  The Company also shall pay to the Executive, at the
conclusion of any contest, to the fullest extent permitted by law, all legal
fees court costs and litigation expenses reasonably incurred by the Executive as
a result of any contest by the Company, the Executive, or others regarding the
validity or enforceability of or liability under, or otherwise involving, any
provision of this Agreement (except to the extent it is determined by a court of
competent jurisdiction, mediator or arbitrator, as the case may be, that the
Executive's material claim is, or claims are, frivolous or without merit, in
which case the Executive shall bear all such fees and expenses), together with
interest on any delayed payment at the applicable federal rate provided for in
Section 7872(f)(2)(A) of the Code.
 
    11. SUCCESSORS.
 
        (a) This Agreement is personal to the Executive and, without the prior
    written consent of the Company, shall not be assignable by the Executive
    otherwise than by will or the laws of descent and distribution. This
    Agreement shall inure to the benefit of and be enforceable by the
    Executive's legal representatives. If the Executive shall die while any
    amount would still be payable to the Executive hereunder (other than amounts
    which, by their terms, terminate upon the death of the Executive) if the
    Executive had continued to live, all such amounts, unless otherwise provided
    herein, shall be paid in accordance with the terms of this Agreement to the
    executors, personal representatives or administrators of the Executive's
    estate.
 
        (b) This Agreement shall inure to the benefit of and be binding upon the
    Company and its successors and assigns.
 
        (c) The Company shall require any successor (whether direct or indirect,
    by purchase, merger, consolidation or otherwise) to all or substantially all
    of the business and/or assets of the Company expressly to assume and agree
    to perform this Agreement in the same manner and to the same extent that the
    Company would have been required to perform it if no such succession had
    taken place. Failure of the Company to obtain such assumption and agreement
    prior to the effectiveness of any such succession shall be a breach of this
    Agreement and shall entitle the Executive to compensation from the Company
    in the same amount and on the same terms as the Executive would be entitled
    to hereunder if the Executive were to terminate the Executive's employment
    for Good Reason after a Change in Control, except that, for purposes of
    implementing the foregoing, the date on which any such succession becomes
    effective shall be deemed the Date of Termination. As used in this
    Agreement, "Company" shall mean both the Company as defined above and any
    such successor that assumes and agrees to perform this Agreement, by
    operation of law or otherwise.
 
    12. MISCELLANEOUS.
 
        (a) This Agreement shall be governed by, and construed in accordance
    with, the laws of the Commonwealth of Massachusetts, without reference to
    principles of conflict of laws. The captions of this Agreement are not part
    of the provisions hereof and shall have no force or effect. This Agreement
    may not be amended or modified except by a written agreement executed by the
    parties hereto or their respective successors and legal representatives. Any
    action by the Company to amend or modify this Agreement must be approved by
    the Company's Board of Directors.
 
                                      E-11
<PAGE>
        (b) All notices and other communications under this Agreement shall be
    in writing and shall be given by hand delivery to the other party or by
    registered or certified mail, return receipt requested, postage prepaid,
    addressed as follows:
 
<TABLE>
<S>                    <C>
If to the Executive:   Richard P. Sergel
 
If to the Company:
                       Attention: General Counsel
 
With copy to:          [DESIGNATE PERSON AT NATIONAL GRID TO RECEIVE A COPY OF
                       ANY NOTICES]
 
If to National Grid:
                       Attention: [                ]
 
With copy to:          [DESIGNATE PERSON AT NATIONAL GRID TO RECEIVE A COPY OF
                       ANY NOTICES]
</TABLE>
 
    or to such other address as either party furnishes to the other in writing
    in accordance with this paragraph (b) of Section 12. Notices and
    communications shall be effective when actually received by the addressee.
 
        (c) The invalidity or unenforceability of any provision of this
    Agreement shall not affect the validity or enforceability of any other
    provision of this Agreement. If any provision of this Agreement shall be
    held invalid or unenforceable in part, the remaining portion of such
    provision, together with all other provisions of this Agreement, shall
    remain valid and enforceable and continue in full force and effect to the
    fullest extent consistent with law.
 
        (d) Notwithstanding any other provision of this Agreement, the Company
    may withhold from amounts payable under this Agreement all federal, state,
    local, and foreign taxes that are required to be withheld by applicable laws
    or regulations. All cash amounts required to be paid hereunder shall be paid
    in United States dollars.
 
        (e) The Executive's or the Company's failure to insist upon strict
    compliance with any provision of, or to assert any right under, this
    Agreement (including, without limitation, the right of the Executive to
    terminate employment for Good Reason pursuant to paragraph (c) of Section 4
    of this Agreement) shall not be deemed to be a waiver of such provision or
    right or of any other provision of or right under this Agreement.
 
        (f) The Executive and the Company acknowledge that this Agreement
    supersedes and terminates any other severance and employment agreements
    between the Executive and the Company or any Company affiliates.
 
        (g) The rights and benefits of the Executive under this Agreement may
    not be anticipated, assigned, alienated or subject to attachment,
    garnishment, levy, execution or other legal or equitable process except as
    required by law. Any attempt by the Executive to anticipate, alienate
    assign, sell, transfer, pledge, encumber or charge the same shall be void.
    Payments hereunder shall not be considered assets of the Executive in the
    event of insolvency or bankruptcy. The obligations of the Company and the
    Executive under this Agreement which by their nature may require either
    partial
 
                                      E-12
<PAGE>
    or total performance after the expiration of the Employment Period
    (including, without limitation, those under Sections 4, 5, 8 and 9 hereof)
    shall survive such expiration.
 
        (h) This Agreement may be executed in several counterparts, each of
    which shall be deemed an original, and said counterparts shall constitute
    but one and the same instrument.
 
    IN WITNESS WHEREOF, the Executive has hereunto set the Executive's hand and,
pursuant to the authorization of their respective Boards of Directors, the
Company and National Grid (with respect to Section 3(b)(ii) only) have caused
this Agreement to be executed in their name on their behalf, all as of the day
and year first above written.
 
                                          RICHARD P. SERGEL
 
                                          ______________________________________
 
                                          NEW ENGLAND ELECTRIC SYSTEM
 
                                          By: __________________________________
                                              Its
 
                                          THE NATIONAL GRID GROUP PLC
                                          (in respect of Section 3(b)(ii) only)
 
                                          By: __________________________________
                                              Its
 
                                      E-13
<PAGE>
                                                                      APPENDIX F
 
                          FORM OF CONSULTING AGREEMENT
 
    CONSULTING AGREEMENT (this "Agreement"), dated as of             , by and
among The National Grid Group PLC, a public limited company incorporated under
the laws of England and Wales with registration number 2367004 ("Parent"), New
England Electric System, a Massachusetts business trust (the "Company") and
Alfred D. Houston (the "Consultant").
 
    WHEREAS, Parent, NGG Holdings, LLC (formerly Iosta LLC), a Massachusetts
limited liability company which is directly and indirectly wholly owned by the
Parent ("LLC"), and the Company have entered into an Agreement and Plan of
Merger (the "Merger Agreement"), dated as of December 11, 1998, pursuant to
which, among other things, LLC will merge with and into the Company (the
"Merger") and Parent will own, directly or indirectly all of the issued and
outstanding common shares of the Company;
 
    WHEREAS, following the consummation of the Merger the Consultant intends to
terminate his employment with the Company for Good Reason (as defined in the
Severance Agreement entered into between the Company and the Consultant dated
February 28, 1995 (the "Severance Agreement"));
 
    WHEREAS, in connection with the transactions contemplated by the Merger
Agreement and in recognition of the Consultant's experience and abilities,
Parent and the Company desire to enter into a consulting agreement with the
Consultant in accordance with and subject to the terms and conditions provided
herein in order to retain for the Company the benefit of the Consultant's
services; and
 
    WHEREAS, the Consultant wishes to perform services for the Company in
accordance with and subject to the terms and conditions provided herein.
 
    NOW, THEREFORE, in consideration of the mutual premises and the respective
covenants and agreements of the parties herein contained, and intending to be
legally bound hereby, the parties hereto agree as follows:
 
    1.  TERMINATION OF EMPLOYMENT.  The parties hereby agree that the
Consultant's employment with the Company shall terminate within one month
following the Effective Time (as defined in the Merger Agreement), and that such
termination shall be treated as a termination for "Good Reason" following a
"Change in Control" for all purposes under the Severance Agreement.
 
    2.  ENGAGEMENT AS CONSULTANT.  The Company hereby agrees to engage the
Consultant, and the Consultant hereby agrees to perform services for the
Company, on the terms and conditions set forth herein.
 
    3.  TERM.  The Term of this Agreement (the "Term") shall commence at the
Effective Time and terminate on the second anniversary thereof. This Agreement
shall be of no force and effect unless and until the Effective Time occurs.
 
    4.  DUTIES.  During the Term, the Consultant shall (i) perform such services
relating to the business of the Company and its subsidiaries as the Consultant
and the Chief Executive Officer of the Company shall mutually agree (ii) shall
provide advisory and consulting services and give the Company and its
subsidiaries the benefit of his special knowledge, skill, contacts and business
experience and (iii) be required to report only to the Chief Executive Officer
of the Company. Due to Consultant's long relationship with the Company and his
recognition in the community, his participation as a consultant in the Company's
business will add to the stature of the Company and its affiliates. The
Consultant shall in no event be required to provide consulting services to the
Company for more than 60 days per year. The scheduling of such time shall be
mutually agreeable to the Consultant and the Company. The Company acknowledges
that the Consultant is permitted to pursue other activities,
 
                                      F-1
<PAGE>
whether of a personal or business nature, and, accordingly, may not always be
immediately available to the Company.
 
    5.  PLACE OF PERFORMANCE.  The Consultant shall perform his duties and
conduct his business from his primary residence and/or at such other locations
as are reasonably acceptable to him and the Company; PROVIDED, HOWEVER, that, to
the extent that the Company requests the Consultant to perform services from a
different location and the Consultant agrees to do so, the Consultant shall be
provided with the office space substantially comparable to the office space used
by him during his employment as an officer of the Company at the Company's
headquarters or at an alternative location reasonably acceptable to the
Consultant and the Company.
 
    6.  INDEPENDENT CONTRACTOR.  During the term of this Agreement, the
Consultant shall be an independent contractor and not an employee of the Company
and is not entitled to any benefits (other than those to which he is entitled as
a retiree or former employee of the Company) provided by the Company and/or its
affiliates to its employees, including but not limited to group insurance
coverage and eligibility to participate in any retirement plans or employee
benefit plans. Accordingly, Consultant shall be responsible for payment of all
taxes, including Federal and State income tax, Social Security tax, Unemployment
Insurance tax, and any other taxes or business license fees as required.
 
    7.  COMPENSATION AND RELATED MATTERS.
 
        (a) MONTHLY CONSULTING FEE. During the Term, the Company shall pay to
    the Consultant, in equal monthly installments, an annual consulting fee of
    $200,000 per year (the "Consulting Fee").
 
        (b) BUSINESS EXPENSES. The Consultant shall be reimbursed by the Company
    for all reasonable business expenses incurred by him in connection with the
    performance of his consulting services hereunder upon submission by the
    Consultant of receipts and other documentation in accordance with the
    Company's normal reimbursement procedures.
 
    8.  TERMINATION.  The Consultant's engagement as a consultant hereunder
shall terminate without further action by any party hereto upon the expiration
of the Term. This Agreement may also be terminated by the Consultant or the
Company upon 30 days written notice to the other (or such shorter period to
which the parties shall agree). Upon termination of this Agreement by the
Consultant in accordance with the immediately preceding sentence, the parties
hereto shall have no further obligation or liability under this Agreement,
except that the Company shall pay the Consultant all fees and reimburse the
Consultant for all reasonable expenses earned or incurred hereunder prior to the
date of termination. Upon termination of this Agreement by the Company in
accordance with this Section 8, the Company shall pay to the Consultant, in a
single lump sum cash payment, all amounts (including the Consulting Fee) that
would otherwise have been paid under Section 7 hereof for the remainder of his
Term. Notwithstanding anything in this Agreement to the contrary, the Company's
obligations under Section 10 hereof shall survive the termination or expiration
of this Agreement.
 
    9.  COMPLIANCE WITH LAW.  The Consultant agrees to comply with all federal,
state and municipal laws, rules and regulations, as well as all policies and
procedures of the Company, that are now or may in the future become applicable
to the Consultant in connection with his services to the Company.
 
    10.  INDEMNIFICATION.  The Company shall indemnify and hold harmless the
Consultant to the full extent permitted by law and the by-laws of the Company
for all expenses, costs, liabilities and legal fees that the Consultant may
incur that arise out of or are connected to the discharge of his duties
hereunder or his service on any Company requested boards or organizations. In
addition, the Company will indemnify and hold harmless the Consultant, on an
after-tax basis, for any expenses, costs, liabilities, fees excise taxes and
legal costs that the Consultant may incur in respect of any benefits or payments
due hereunder or described in the letter dated April 13, 1998 from the Chief
Executive Officer of the Company to the Consultant.
 
                                      F-2
<PAGE>
    11.  SUCCESSORS; BINDING AGREEMENT.
 
        (a) The Company shall require any successor to all or substantially all
    of the business or assets of the Company to expressly assume and agree to
    perform this Agreement in the same manner and to the same extent that the
    Company would be required to perform it if no such succession had taken
    place.
 
        (b) This Agreement and all rights of the Consultant hereunder shall
    inure to the benefit of and be enforceable by the Consultant's personal or
    legal representatives, executors, administrators, successors, heirs,
    distributees, devisees and legatees. This Agreement is personal to and may
    not be assigned by the Consultant.
 
        (c) This agreement constitutes the entire agreement among the parties
    hereto with respect to the subject matter hereof and, on and after the
    Effective Time, this Agreement shall supercede any other agreement between
    the parties hereto with respect to the subject matter hereof, provided
    however that this Agreement shall not supercede either (i) the Severance
    Agreement or (ii) the obligations of the Company set forth in the letter
    from the Chief Executive Officer of the Company to the Consultant dated
    April 13, 1998.
 
    12.  NOTICES.  All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered personally, telecopied (which is
confirmed) or sent by an overnight courier service to the parties at the
following addresses (or at such other addresses for a party as shall be
specified by the notice):
 
<TABLE>
<S>                                    <C>
If to the Company:                     New England Electric System
                                       [25 Research Drive
                                       Westborough, MA 01582]
                                       Attention: Corporate Secretary
 
If to the Consultant:                  Alfred D. Houston
                                       [
                                       ]
</TABLE>
 
    13.  DISPUTES.  Any dispute, controversy or claim arising out of or relating
to this Agreement, or the breach, termination or validity hereof, shall be
finally settled by arbitration by one arbitrator in Massachusetts pursuant to
the Commercial Arbitration Rules of the American Arbitration Association then in
effect. Judgment may be entered on the arbitrator's award in any court of
competent jurisdiction.
 
    14.  MISCELLANEOUS.  No provisions of this Agreement may be modified, waived
or discharged unless such waiver, modification or discharge is agreed to in
writing signed by the parties hereto. No waiver by a party hereto at any time of
any breach by the other party hereto of, or compliance with, any condition or
provision of this Agreement to be performed by such other party shall be deemed
a waiver of similar or dissimilar provisions or conditions at the same or at any
prior or subsequent time. No agreements or representations, oral or otherwise,
express or implied, with respect to the subject matter hereof have been made by
the parties which are not set forth expressly in this Agreement. This Agreement
shall be governed and construed in accordance with the laws of Massachusetts,
without giving effect to the principles of conflicts of law thereunder.
 
    15.  COUNTERPARTS.  This Agreement may be executed in counterparts, each of
which shall be deemed to be an original but both of which together shall
constitute one and the same instrument.
 
    16.  ENFORCEMENT.  The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement.
 
                                      F-3
<PAGE>
    IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date and year first above written.
 
<TABLE>
<S>                             <C>  <C>
                                THE NATIONAL GRID GROUP PLC
 
                                By:
                                     -----------------------------------------
                                     Name:
                                     Title:
 
                                NEW ENGLAND ELECTRIC SYSTEM
 
                                By:
                                     -----------------------------------------
                                     Name:
                                     Title:
 
                                By:
                                     -----------------------------------------
                                     Alfred D. Houston
</TABLE>
 
                                      F-4


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