EASTERN ENTERPRISES
DEFM14A, 2000-03-15
NATURAL GAS DISTRIBUTION
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<PAGE>

                            SCHEDULE 14A INFORMATION

  Proxy Statement Pursuant to 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:
[_]Confidential, for Use of the Commission Only
[_]Preliminary Proxy Statement (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

                              EASTERN ENTERPRISES
                (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):
[_]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
      Stock, par value $1.00 per share, of Eastern Enterprises ("Eastern")
  (2) Aggregate number of securities to which transaction applies: 27,117,742
      shares of Eastern Common Stock (issued and outstanding as of January
      18, 2000)
  (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): $64.00 per
      share of Eastern Common Stock, par value $1.00 per share
  (4) Proposed maximum aggregate value of transaction: $1,735,535,488.00
  (5) Total fee paid: $347,107.00

[X]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 Statement No.:
  (3) Filing Party:
  (4) Date Filed:
<PAGE>


                    [Eastern Enterprises Logo Appears Here]

                                                                  March 16, 2000

Dear Shareholders:

   You are cordially invited to attend the Annual Meeting of shareholders of
Eastern Enterprises ("Eastern") to be held on April 26, 2000, at 10:00 a.m.,
local time, at the Auditorium of Fleet Boston, 100 Federal Street, Boston,
Massachusetts. At this year's Annual Meeting, in addition to electing three
Trustees, you will be asked to vote to approve an amendment to Eastern's
Declaration of Trust that will authorize certain mergers, and to vote upon a
merger that, if consummated, will result in you receiving $64.00 in cash per
share for your shares of Eastern Common Stock, subject to your appraisal rights
under Massachusetts law. You will be entitled to receive an additional $0.006
per share for each day the merger has not closed beginning on the later of (a)
August 4, 2000 or (b) ninety days after the State of New Hampshire gives final
regulatory approval of the merger (the "Increased Consideration"), less any per
share increase in any dividend paid to shareholders attributable to the period
in which any Increased Consideration accrues.

   If you approve the merger, ACJ Acquisition LLC, a newly-formed Massachusetts
limited liability company and wholly-owned subsidiary of KeySpan Corporation
(d/b/a KeySpan Energy) ("KeySpan"), a New York corporation, will be merged with
and into Eastern with Eastern being the surviving entity in the merger. KeySpan
is a publicly traded corporation with its shares listed on the New York and
Pacific Stock Exchanges under the symbol "KSE."

   Eastern's Board of Trustees (the "Board") has unanimously voted in favor of
the merger. In connection with the merger, Salomon Smith Barney, Eastern's
financial advisor, delivered to the Board an opinion as to the fairness, from a
financial point of view, of the Merger Consideration to the holders of Eastern
Common Stock. The written opinion of Salomon Smith Barney, dated November 3,
1999, is attached as Appendix B to the enclosed proxy statement. The approval
and determination of the Board was based on a number of factors, including the
opinion of Salomon Smith Barney, all of which are described in the enclosed
proxy statement.

   We cannot complete the merger unless the holders of at least a majority of
the outstanding shares of common stock approve it. The accompanying proxy
statement provides detailed information about the proposed merger, and it
includes a copy of the merger agreement, as amended, attached as Appendix A.

   As more fully explained in the accompanying proxy statement, Eastern
believes that before the merger can take place, Eastern's Declaration of Trust
must be amended to include certain new provisions allowing the merger to be
completed in the manner contemplated by the merger agreement. Under the merger
agreement, approval of this amendment is a condition to consummation of the
merger. Therefore, the Board unanimously recommends that you vote FOR approval
of the amendment to Eastern's Declaration of Trust.

   The Board has determined that the merger and the amendment to the
Declaration of Trust are advisable and fair to you and in your best interest.
The Board therefore recommends that you approve and adopt both the amendment to
the Declaration of Trust and the merger agreement.

   Please give all this information your careful attention. Approval of the
merger and the amendment to the Declaration of Trust at the Annual Meeting will
require the affirmative vote of the holders of a majority of the outstanding
shares of Eastern Common Stock entitled to vote at the Annual Meeting.
<PAGE>

   Whether or not you plan to attend, it is important that your shares are
represented at the Annual Meeting. A failure to vote will count as a vote
against the above matters. You are requested to promptly complete, sign and
date the enclosed proxy card and return it in the envelope provided, whether or
not you plan to attend. This will not prevent you from voting your shares in
person if you later choose to attend the Annual Meeting. If the merger is
approved by Eastern's shareholders, you will receive instructions for
surrendering your Eastern share certificates and a letter of transmittal to be
used for this purpose. You should not submit your share certificates for
exchange until you have received these instructions and the letter of
transmittal.

   Thank you for your prompt attention to these matters.

                                          Sincerely,


                                          [signature of J. Atwood Ives appears
                                          here]
                                          J. Atwood Ives
                                          Chief Executive Officer and Chairman

   This proxy statement is dated March 16, 2000, and is first being mailed to
Eastern's shareholders on or about March 16, 2000.

                                       2
<PAGE>

                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

                                                                  March 16, 2000

To the holders of Common Stock of Eastern Enterprises:

   NOTICE IS HEREBY GIVEN that the Annual Meeting of shareholders of Eastern
Enterprises, a Massachusetts business trust ("Eastern"), will be held on April
26, 2000 at 10:00 a.m., local time, at the Auditorium of Fleet Boston, 100
Federal Street, Boston, Massachusetts. The purpose of the meeting is for you
to:

     1. Amend Section 38 of Eastern's Declaration of Trust to authorize the
  merger of certain entities with and into Eastern;

     2. Consider and vote upon a proposal to approve and adopt an Agreement
  and Plan of Merger, dated as of November 4, 1999, as amended, by and among
  Eastern, KeySpan Corporation ("KeySpan") and ACJ Acquisition LLC ("ACJ
  Acquisition"). Pursuant to the merger agreement, ACJ Acquisition, a newly-
  formed Massachusetts limited liability company and wholly-owned subsidiary
  of KeySpan, a New York corporation, will be merged with and into Eastern
  with Eastern being the surviving entity in the merger. Each outstanding
  share of Eastern Common Stock held by Eastern shareholders, other than
  shares held by Eastern shareholders who are entitled to and have perfected
  their dissenters' appraisal rights, will be converted into the right to
  receive $64.00 in cash, without interest. You will also receive an
  additional $0.006 per share for each day the merger has not closed
  beginning on the later of (a) August 4, 2000 or (b) ninety days after the
  State of New Hampshire gives final regulatory approval of the merger. This
  aggregate additional amount will be reduced by the aggregate amount of any
  per share increase in any dividend actually paid that is attributable to
  any period in which such additional amount accrues. Shares of Eastern held
  by Eastern, KeySpan and any wholly-owned subsidiaries of KeySpan will be
  canceled in the merger. A copy of the merger agreement is attached as
  Appendix A and is described in the accompanying proxy statement;

     3. Elect three Trustees to serve until the 2003 Annual Meeting of
  Shareholders or until their successors are elected and qualified; and

     4. Consider and act upon any other matters as may properly come before
  the Annual Meeting or any adjournments or postponements of the Annual
  Meeting.

   Holders of shares of Eastern Common Stock at the close of business on March
7, 2000, will be entitled to notice of, and to vote at, the Annual Meeting or
any adjournments or postponements. A form of proxy and a proxy statement
containing more detailed information with respect to the matters to be
considered at the Annual Meeting accompany and form a part of this notice.

   Shareholders who wish their stock to be voted by proxy are requested to date
and sign the enclosed form of proxy and to return it in the enclosed envelope.
A resolution adopted by the Board of Trustees (the "Board") of Eastern provides
that shares voted by proxy shall be counted only if the proxy form has been
presented for validation to the Secretary prior to the meeting or, if the
meeting is adjourned to another day, prior to such adjourned session.

   Whether or not you are able to attend the Annual Meeting, please sign, date
and return the accompanying proxy card promptly in the enclosed envelope, which
requires no postage if mailed in the United States. Please do not send in any
share certificates at this time.

   The merger has not been approved or disapproved by the Securities and
Exchange Commission ("SEC"), nor has the SEC passed upon the fairness or merits
of the merger or upon the accuracy or adequacy of the information contained in
this document. Any representation to the contrary is unlawful.
<PAGE>

   If you believe that the $64.00 per share consideration is inadequate, you
are entitled to dissent from the merger and elect to perfect dissenters'
appraisal rights and receive payment of the "fair value" of your shares. To do
so, you must comply with the procedures set forth in Sections 85 through 98 of
Chapter 156B of the General Laws of Massachusetts. See "Appraisal Rights of
Dissenting Shareholders" in the proxy statement that accompanies this notice
and the full text of Sections 85 through 98 of Chapter 156B of the General Laws
of Massachusetts, which is attached as Appendix C and is described in the
accompanying proxy statement.

                                          By order of the Board of Trustees,

                                          [Signature of L. William Law, Jr.
                                          appears here]
                                          L. William Law, Jr.
                                          Secretary

                                       2
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<S>                                                                        <C>
CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING INFORMATION............... iii

QUESTIONS AND ANSWERS ABOUT THE MERGER....................................   1

SUMMARY...................................................................   3
  Annual Meeting..........................................................   3
  Proposal 1--Amendment to Eastern's Declaration of Trust.................   3
  Proposal 2--The Merger..................................................   3
  Summary of the Transaction..............................................   4
  Opinion of Eastern's Financial Advisor..................................   5
  Material Federal Income Tax Consequences................................   5
  Potential Conflicts and Interests of Officers and Trustees in the
   Merger.................................................................   5
  Anticipated Accounting Treatment........................................   5
  Governmental and Regulatory Approvals...................................   5
  Appraisal Rights of Dissenting Stockholders.............................   5
  Historical Information..................................................   5
  Proposal 3--Election of Trustees........................................   5
  Other Information.......................................................   5

ANNUAL MEETING............................................................   6
  The Annual Meeting......................................................   6
  Matters to be Considered at the Annual Meeting..........................   6
  Proxy Solicitation......................................................   6
  Outstanding Shares and Voting Power.....................................   6
  Voting and Revocation of Proxies........................................   7

PROPOSAL 1: AMENDMENT TO EASTERN'S DECLARATION OF TRUST TO AUTHORIZE
 CERTAIN MERGERS..........................................................   8

PROPOSAL 2: THE MERGER....................................................   8
  GENERAL DESCRIPTION.....................................................   8
  BACKGROUND OF THE MERGER................................................   8
  THE BOARD'S RECOMMENDATION..............................................  10
    Eastern's Reasons for the Merger......................................  10
    KeySpan's Reasons for the Merger......................................  11
    Certain Benefits and Detriments of the Merger.........................  11
    Financing of the Merger...............................................  12
  OPINION OF EASTERN'S FINANCIAL ADVISOR..................................  12
    Historical Trading Analysis...........................................  13
    Public Market Valuation Analysis......................................  13
    Precedent Transactions Valuation Analysis.............................  15
    Discounted Cash Flow Analysis.........................................  16
    Present Value of Hypothetical Future Stock Price and Dividends
     Analysis.............................................................  17
  MATERIAL FEDERAL INCOME TAX CONSEQUENCES................................  18
  POTENTIAL CONFLICTS AND INTERESTS OF OFFICERS AND TRUSTEES IN THE
   MERGER.................................................................  20
    General...............................................................  20
    Officer Change of Control Agreements..................................  20
    KeySpan Board Seat....................................................  21
    Supplemental Executive Retirement Plan................................  21
    1994 Deferred Compensation Plan.......................................  22
    1982 and 1995 Stock Option Plans......................................  22
    1992 Restricted Stock Plan............................................  22
    Deferred Compensation Plan for Trustees...............................  22
    1996 Non-Employee Trustees' Stock Option Plan.........................  23
    Restricted Stock Plan for Non-Employee Trustees.......................  23
    Officers' and Trustees' Indemnification Insurance.....................  23
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                          <C>
  THE MERGER AGREEMENT......................................................  23
    General Description.....................................................  23
    Certain Terms of the Merger Agreement...................................  23
      Effective Time of the Merger..........................................  24
      General...............................................................  24
      Surrender and Exchange of Stock Certificates..........................  24
      Representations and Warranties........................................  24
      Conduct of Business Pending the Merger................................  26
      No Solicitation.......................................................  28
      Additional Agreements.................................................  29
      Conditions to the Merger..............................................  34
      Termination...........................................................  36
      Termination Fees and Expenses.........................................  37
      Amendment.............................................................  37
    Anticipated Accounting Treatment........................................  38
    Governmental and Regulatory Approvals...................................  38
      State Approvals and Related Matters...................................  38
      Public Utility Holding Company Act of 1935............................  38
      Antitrust Considerations..............................................  38
      General...............................................................  39
    Delisting and Deregistration of Common Stock............................  39
  APPRAISAL RIGHTS OF DISSENTING SHAREHOLDERS...............................  39
  HISTORICAL INFORMATION....................................................  40
  HISTORICAL PER SHARE DATA.................................................  41
  COMPARATIVE DIVIDENDS AND MARKET PRICES...................................  42
  EASTERN COMBINED UNAUDITED PRO FORMA FINANCIAL INFORMATION................  43
  NOTES TO EASTERN COMBINED UNAUDITED PRO FORMA FINANCIAL INFORMATION.......  46

PROPOSAL 3: ELECTION OF TRUSTEES............................................  47
  INFORMATION WITH RESPECT TO THE BOARD.....................................  47
  INFORMATION WITH RESPECT TO NOMINEES AND TRUSTEES.........................  48
  STOCK OWNERSHIP OF TRUSTEES AND EXECUTIVE OFFICERS........................  51
  COMPENSATION OF EXECUTIVE OFFICERS........................................  52
  COMPENSATION OF TRUSTEES..................................................  56
  TERMINATION OF EMPLOYMENT AND CHANGE OF CONTROL ARRANGEMENTS..............  57
  SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE...................  57
  COMPENSATION COMMITTEE REPORT.............................................  58

OTHER INFORMATION...........................................................  61
  PERFORMANCE GRAPH.........................................................  61
  CERTAIN TRANSACTIONS AND OTHER DISCLOSURES................................  62
  INFORMATION WITH RESPECT TO CERTAIN SHAREHOLDERS..........................  63
  INDEPENDENT AUDITORS......................................................  63
  SHAREHOLDER PROPOSALS.....................................................  63
  EXPENSES OF SOLICITATION..................................................  63
  WHERE YOU CAN FIND MORE INFORMATION.......................................  64
  INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE...........................  65

OTHER MATTERS...............................................................  65

INDEX OF DEFINED TERMS......................................................  66

</TABLE>

APPENDICES

  APPENDIX A--The Agreement and Plan of Merger, as amended
  APPENDIX B--Salomon Smith Barney's Opinion
  APPENDIX C--Chapter 156B of the General Laws of Massachusetts Sections 85-
  98
  APPENDIX D--Amendment to Section 38 of the Declaration of Trust

                                       ii
<PAGE>

                        CAUTIONARY STATEMENT CONCERNING
                          FORWARD-LOOKING INFORMATION

   Eastern cautions you that this proxy statement, the information incorporated
in this proxy statement by reference and other statements Eastern may make from
time to time contain statements that may constitute "forward-looking
statements."

   Those statements include statements regarding Eastern's intent, belief or
current expectations, as well as the assumptions on which those statements are
based. Forward-looking statements are not guarantees of future performance and
involve risks and uncertainties, and actual results may differ materially from
those contemplated by forward-looking statements. Important factors currently
known to Eastern's management that could cause actual results that differ
materially from those from forward-looking statements include, but are not
limited to, those factors set forth from time to time in reports that Eastern
has filed with the SEC. Except as required by law, Eastern undertakes no
obligation to update or revise forward-looking statements to reflect changes
and assumptions, the occurrence of unanticipated events or changes to future
operating results over time. You are cautioned not to place too much reliance
on such statements.

                                      iii
<PAGE>

                              EASTERN ENTERPRISES
                               9 Riverside Road
                          Weston, Massachusetts 02493

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

                                PROXY STATEMENT
                    For the Annual Meeting of Shareholders

                         To Be Held On April 26, 2000

                    QUESTIONS AND ANSWERS ABOUT THE MERGER

Q: What will happen in the merger?

A: In the merger, ACJ Acquisition will be merged with and into Eastern with
   Eastern being the surviving entity. If you are a shareholder of Eastern at
   the time of the merger, you will receive a $64.00 cash payment, without
   interest, for each of your outstanding shares of Eastern Common Stock,
   unless you exercise and perfect your dissenters' appraisal rights. You will
   also receive an additional $0.006 per share for each day the merger has not
   closed beginning on the later of (a) August 4, 2000 or (b) ninety days
   after the State of New Hampshire gives final regulatory approval of the
   merger. This aggregate additional amount will be reduced by the aggregate
   amount of any per share increase in any dividend actually paid that is
   attributable to any period in which the additional amount accrues. After
   the merger, Eastern will be owned by KeySpan, the sole shareholder of ACJ
   Acquisition, and you will no longer own stock in Eastern. To review the
   structure of the merger in greater detail, see pages 23 through 37.

Q:  Why is it necessary to amend the Eastern Declaration of Trust prior to
    consummation of the merger?

A: The Eastern Declaration of Trust is being amended to allow Eastern to merge
   in the manner contemplated by the merger agreement. Under the merger
   agreement, approval of this amendment is a condition to the closing of the
   merger.

Q: What will I receive in the merger?

A: You will receive $64.00 in cash, without interest, for each share of
   Eastern Common Stock that you own, unless you exercise and perfect your
   dissenters' appraisal rights. You will also receive an additional $0.006
   per share for each day the merger has not closed beginning on the later of
   (a) August 4, 2000 or (b) ninety days after the State of New Hampshire
   gives final regulatory approval of the merger. This aggregate additional
   amount will be reduced by the aggregate amount of any per share increase in
   any dividend actually paid that is attributable to any period in which the
   additional amount accrues. This is the "Merger Consideration."

Q: Why is Eastern being merged?

A: Eastern's Board of Trustees (the "Board") believes that the merger of ACJ
   Acquisition into Eastern and the $64.00 per share you will receive in the
   merger are fair and are in your best interest. In approving the merger, the
   Board considered, among other things, the receipt by Eastern shareholders
   of a substantial premium over Eastern's market price at the time the merger
   agreement was signed. The Board approved the merger after exploring
   strategic alternatives and pursuing an extensive bid process. To review the
   background and reasons for the merger in greater detail, see pages 8
   through 11.

Q: When do you expect the merger to be completed?

A: We are working to complete the merger sometime between June 2000 and
   October 2000, although it is possible that the merger will not be completed
   until 2001.

Q: What are the tax consequences of the merger to me?

A: Your receipt of the Merger Consideration will be a taxable transaction for
   federal income tax purposes. To review the federal income tax

                                       1
<PAGE>

   consequences to you in greater detail, see pages 18 through 19. You should
   consult your tax advisors for a full understanding of the tax consequences
   of the merger to you in light of your personal situation.

Q: What am I being asked to vote upon?

A: You are being asked to approve and adopt both an amendment to Eastern's
   Declaration of Trust and the merger agreement, which provides for the merger
   of ACJ Acquisition into Eastern.

   The Board has unanimously approved both the amendment and the merger
   agreement. The Board recommends voting FOR both the amendment and approval
   and adoption of the merger agreement.

   You are also being asked to vote upon the election of Trustees to serve
   until the 2003 Annual Meeting of Shareholders or until their successors are
   elected and qualified.

Q: What do I need to do now?

A: Simply indicate on your proxy card how you want to vote and sign, date and
   mail it in the enclosed envelope as soon as possible, so that your shares
   will be represented at the Annual Meeting. Approval of the amendment and the
   merger each requires the affirmative vote of the holders of a majority of
   the outstanding shares of Eastern Common Stock entitled to vote on the
   proposals.

   The three nominees for election as Trustees at the 2000 Annual Meeting who
   receive the greatest number of votes properly cast will be elected as
   Trustees.

Q: What happens if I don't return a proxy card?

A: The failure to return your proxy card will have the same effect as voting
   against the amendment to the Eastern Declaration of Trust and the merger. It
   will have no effect upon the outcome of the election of the Trustees.

Q: May I vote in person?

A: Yes. You may attend the Annual Meeting and vote your shares in person,
   whether or not you have signed and returned your proxy card.

Q: May I change my vote after I have voted my proxy?

A: Yes. You may change your vote at any time before your proxy is voted at the
   Annual Meeting by following the instructions as detailed in "Voting and
   Revocation of Proxies" on page 7. Before your proxy is voted, you may submit
   a new proxy or you may attend the Annual Meeting and vote in person.

Q: If my shares are held in "street name" by my broker, will my broker vote my
   shares for me?

A: Your broker will vote your shares only if you provide him or her
   instructions on how to vote. You should instruct your broker how to vote
   your shares, following the directions your broker provides. If you do not
   provide instructions to your broker, your shares will not be voted and they
   will be counted as votes against the proposals to amend the Declaration of
   Trust and to approve and adopt the merger agreement.

Q: Should I send in my stock certificates now?

A: No. After the merger is completed, Eastern will send you written
   instructions for exchanging your Eastern Common Stock certificates for the
   Merger Consideration.

Q: Who can help answer my questions?

A: If you have additional questions about the amendment to the Declaration of
   Trust or the merger, you should contact:

                              Corporate Relations
                              Eastern Enterprises
                                9 Riverside Road
                          Weston, Massachusetts 02493
                           Telephone: (781) 647-2300

                                       2
<PAGE>

                                    SUMMARY

   This summary highlights selected information from this document and may not
contain all of the information that is important to you. For a more complete
understanding of the merger and for a more complete description of the legal
terms of the merger, you should read carefully this entire document and the
other available information referred to in "Where You Can Find More
Information" on page 63.

Annual Meeting (See page 6)

   The Annual Meeting will be held on April 26, 2000 at 10:00 a.m., local time,
at the Auditorium of Fleet Boston, 100 Federal Street, Boston, Massachusetts.

Proposal 1--Amendment to Eastern's Declaration of Trust (See page 8)

   In order to complete the merger, Eastern must amend its Declaration of Trust
to allow ACJ Acquisition LLC ("ACJ Acquisition") to merge with and into
Eastern, with Eastern being the surviving entity, as contemplated by the merger
agreement. All amendments to Eastern's Declaration of Trust must be approved by
the holders of a majority of the outstanding shares of Common Stock of Eastern.

Proposal 2--The Merger (See page 8)

   Eastern Enterprises ("Eastern") is a Massachusetts business trust
established and existing under a Declaration of Trust. Eastern conducts its
business through its operating subsidiaries.

   Eastern's principal operating subsidiaries are:

  . Boston Gas Company, a regulated utility that distributes natural gas in
    eastern and central Massachusetts, and also sells natural gas for resale
    in Massachusetts. Boston Gas has been wholly-owned by Eastern since 1929
    and has been in business for 177 years, making it the second oldest gas
    company in the United States.

  . Colonial Gas Company, a regulated utility that distributes natural gas in
    Cape Cod and eastern Massachusetts. Colonial Gas has been in business for
    150 years and was purchased by Eastern in August 1999.

  . Essex Gas Company, a regulated utility that distributes natural gas in
    eastern Massachusetts. Essex Gas has been in business for 146 years and
    was purchased by Eastern in September 1998.

  . Midland Enterprises Inc., which through its wholly-owned operating
    subsidiaries is the second largest independent operator of tow boats and
    barges on the nation's inland river system, principally on the Ohio River
    and Mississippi River and their tributaries, the Gulf Intracoastal
    Waterway and the Gulf of Mexico. Midland Enterprises has been wholly-
    owned by Eastern since 1961 and has been operating on the nation's inland
    waterways since 1925 and transports dry bulk commodities, a major portion
    of which is coal.

  . Transgas Inc., an unregulated energy trucking company, which provides
    over-the-road transportation of liquefied natural gas, propane and other
    commodities. Transgas is the nation's largest over-the-road transporter
    of liquefied natural gas.

  . ServicEdge Partners, Inc., which offers heating, ventilation and air
    conditioning services primarily to residential customers in eastern
    Massachusetts.

   Together, Boston Gas Company, Colonial Gas Company and Essex Gas Company are
engaged in the purchase, transportation and sale of natural gas to more than
735,000 residential, commercial and industrial customers in Boston and 114
other communities in eastern and central Massachusetts, including Cape Cod.
Eastern provides overall corporate management and certain staff services to
Boston Gas Company, Colonial Gas Company, Essex Gas Company, Midland
Enterprises Inc., Transgas Inc. and ServicEdge Partners, Inc.

   On July 14, 1999, Eastern entered into an agreement of merger with
EnergyNorth, Inc., a New Hampshire corporation ("EnergyNorth") and parent

                                       3
<PAGE>

company of EnergyNorth Natural Gas, Inc., a New Hampshire gas utility. This
agreement was amended on November 4, 1999, the date on which Eastern and
KeySpan Corporation ("KeySpan") entered into the merger agreement. The
agreement between Eastern and EnergyNorth, as amended, provides that
EnergyNorth will merge with Eastern's merger subsidiary and become a wholly-
owned subsidiary of Eastern.

   If the KeySpan-Eastern merger agreement has not been terminated prior to the
effective time of the Eastern-EnergyNorth merger, each share of EnergyNorth
common stock will be converted into the right to receive $61.13 in cash. If the
KeySpan-Eastern merger agreement has been terminated at the effective time of
the Eastern-EnergyNorth merger, each share of EnergyNorth common stock will be
converted into the right to receive cash or shares of Eastern Common Stock, or
a combination of the two, with a value of $47.00, subject to adjustment as
provided in the Eastern-EnergyNorth merger agreement.

   The Eastern-EnergyNorth merger will become effective following the approval
of the merger by holders of a majority of the shares of EnergyNorth and
satisfaction or waiver of all other conditions included in the Eastern-
EnergyNorth merger agreement. These include approval of the New Hampshire
Public Utilities Commission, approval by the SEC under the Public Utility
Holding Company Act of 1935 and expiration or earlier termination of the
applicable waiting period under the Hart-Scott- Rodino Antitrust Improvements
Act of 1976. The parties anticipate that the Eastern-EnergyNorth merger will be
completed concurrently with the merger of Eastern and KeySpan.

   Eastern's mailing address is 9 Riverside Road, Weston, Massachusetts 02493
and its general telephone number is (781) 647-2300.

   KeySpan is a publicly traded corporation listed on the New York and Pacific
Stock Exchanges under the symbol "KSE." As a result of the merger, KeySpan will
be the sole shareholder of Eastern. KeySpan provides a range of energy related
services through subsidiaries operating in select areas of the energy industry.
KeySpan's gas utility subsidiaries, Brooklyn Union Gas Company and KeySpan Gas
East, together serve approximately 1.6 million customers in the New York City
metropolitan area.

   KeySpan's mailing address is One Metrotech Center, Brooklyn, New York 11201-
3850 and its general telephone number is (718) 403-1000.

   KeySpan currently owns 100% of the issued and outstanding membership
interests of ACJ Acquisition, which will be merged with Eastern pursuant to the
merger agreement. ACJ Acquisition is a Massachusetts limited liability company
and was formed specifically for the purpose of consummating the merger. It is a
wholly-owned subsidiary of KeySpan and will be merged out of existence at the
effective time of the merger.

   ACJ Acquisition's mailing address is c/o KeySpan Corporation, One Metrotech
Center, Brooklyn, New York 11201-3850 and its general telephone number is (718)
403-1000.

Summary of the Transaction (See page 23)

   The merger agreement is described herein under "The Merger Agreement" and a
copy, as amended, is attached at the back of this proxy statement as Appendix
A. We encourage you to read the merger agreement as it is the legal document
that governs the merger. In the proposed merger, ACJ Acquisition, KeySpan's
merger subsidiary, will be merged with and into Eastern and, as a result,
Eastern will become a wholly-owned subsidiary of KeySpan.

   In the merger, holders of Eastern Common Stock will receive $64.00 in cash,
without interest, for each share held (other than shares in respect of which
appraisal rights have been perfected), plus an additional $0.006 per share for
each day the merger has not closed beginning on the later of (a) August 4, 2000
or (b) ninety days after the State of New Hampshire gives final regulatory
approval of the merger, provided, however, that the aggregate additional amount
will be reduced by the aggregate amount of any per share increase in any
dividend actually paid that is attributable to any period in which the
additional amount accrues (the "Merger Consideration").
                                       4
<PAGE>


   The merger will become effective following the approval of the merger by the
holders of a majority of the outstanding shares of Common Stock of Eastern,
and, in addition, all other conditions to the merger must be satisfied or
waived. These include approval of the New Hampshire Public Utilities Commission
(which is required in connection with the acquisition of EnergyNorth), approval
by the SEC under the Public Utility Holding Company Act of 1935, expiration or
earlier termination of the applicable waiting period under the Hart-Scott-
Rodino Antitrust Improvements Act of 1976 and the filing of articles of merger
with the Secretary of the Commonwealth of Massachusetts.

Opinion of Eastern's Financial Advisor (See page 12)

   In deciding to approve the merger, one of the factors Eastern's Board
considered was the opinion from its financial advisor, Salomon Smith Barney
Inc., that, as of November 3, 1999, the Merger Consideration was fair, from a
financial point of view, to Eastern shareholders. This opinion is attached as
Appendix B to this proxy statement. We urge you to read the opinion in its
entirety. The opinion of Salomon Smith Barney is directed to the Board and does
not constitute a recommendation to you as to how you should vote with respect
to matters relating to the proposed merger.

Material Federal Income Tax Consequences (See page 18)

   The receipt of the Merger Consideration in the merger by Eastern
shareholders will be a taxable transaction for federal income tax purposes.

Potential Conflicts and Interests of Officers and Trustees in the Merger (See
page 20)

   Certain executive officers and certain Trustees of Eastern may be deemed to
have interests in the merger that are in addition to their interests as
shareholders of Eastern, and such interests are described in "Potential
Conflicts and Interests of Officers and Trustees in the Merger."

Anticipated Accounting Treatment (See page 37)

   The merger will be accounted for as a purchase for accounting and financial
reporting purposes.

Governmental and Regulatory Approvals (See page 37)

   The approvals of the SEC under the Public Utility Holding Company Act of
1935, the expiration or earlier termination of the applicable waiting period
under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and the approval
of the New Hampshire Public Utilities Commission under New Hampshire law (which
is required in connection with the acquisition of EnergyNorth) are required in
order to complete the merger. As of the date of this Proxy Statement, none of
the required regulatory approvals have been obtained.

Appraisal Rights of Dissenting Stockholders (See page 39)

   Holders of Eastern Common Stock who do not vote for the merger will be
entitled to appraisal rights. More detailed information regarding the appraisal
rights and the procedure to be followed for exercising them is provided under
"Appraisal Rights of Dissenting Shareholders."

Historical Information (See page 40)

   Historical high and low prices of Eastern's stock and the amounts of
dividends declared since January 1, 1997 may be found under "Comparative
Dividends and Market Prices."

Proposal 3--Election of Trustees (See page 46)

   Information regarding the three nominees for re-election as Trustees, other
Trustees, their levels of Eastern Common Stock ownership, and other benefits
and compensation are described herein. Also described is information about
executive officers and their compensation, as well as a report by the
Compensation Committee under "Proposal 3: Election of Trustees."

Other Information (See page 60)

   A stock performance graph, information with regard to certain transactions
and other disclosures, certain beneficial owners of Eastern stock, the
independent auditors, shareholder proposals for the 2001 Annual Meeting and
expenses of solicitation of this Proxy Statement may be found in "Other
Information."

                                       5
<PAGE>

                                 ANNUAL MEETING

   The enclosed form of proxy has been prepared at the direction of Eastern's
Board, 9 Riverside Road, Weston, Massachusetts 02493. Such proxy is solicited
on behalf of, and the proxies named therein have been designated by, the Board.
Giving the proxy will not affect your right to revoke the proxy prior to voting
and vote in person should you decide to attend the Annual Meeting. Written
notice of any such revocation may be addressed to the Secretary of Eastern.
Shares represented by the enclosed form of proxy, when properly executed and
presented, will be voted as directed therein.

   This Proxy Statement, the enclosed form of proxy and the Annual Report to
Shareholders, including financial statements, were mailed together to
shareholders on or about March 16, 2000.

The Annual Meeting

   The Annual Meeting will be held on April 26, 2000 at 10:00 a.m., local time,
at the Auditorium of Fleet Boston, 100 Federal Street, Boston, Massachusetts.

Matters to be Considered at the Annual Meeting

   At the Annual Meeting, the Eastern shareholders will be asked to consider
and vote upon a proposal to (1) amend Eastern's Declaration of Trust to
authorize certain mergers and (2) approve and adopt an agreement and plan of
merger dated November 4, 1999, as amended, among Eastern, KeySpan and ACJ
Acquisition. Pursuant to the merger agreement, ACJ Acquisition will be merged
with and into Eastern and each outstanding share of Eastern Common Stock held
by Eastern shareholders will be converted into the right to receive $64.00 in
cash, without interest, other than shares in respect of which appraisal rights
have been perfected. Each shareholder will also receive an additional $0.006
per share for each day the merger has not closed beginning on the later of (a)
August 4, 2000 or (b) ninety days after the State of New Hampshire gives final
regulatory approval of the merger. This aggregate additional amount will be
reduced by the aggregate amount of any per share increase in any dividend
actually paid that is attributable to any period in which the additional amount
accrues. Shares of Eastern common stock held by Eastern, KeySpan and any
wholly-owned subsidiaries of KeySpan will be canceled in the merger. Upon
consummation of the merger, the current shares of Eastern Common Stock will
cease to represent ownership interests in Eastern.

   At the Annual Meeting, the Eastern shareholders will also be asked to elect
three Trustees to serve until the 2003 Annual Meeting of Shareholders or until
their successors are elected and qualified.

   The Board is not aware of any other matter that will be brought before the
Annual Meeting. If, however, other matters are presented, your proxy will be
voted in the discretion of the holder of your proxy.

Proxy Solicitation

   Eastern is soliciting your proxy and will pay all expenses incurred in
connection with the solicitation of the enclosed proxy. Officers, Trustees and
regular employees of Eastern may solicit proxies in person or by telephone.
They will receive no additional compensation for their services. Eastern has
requested brokers and nominees who hold stock in their names to furnish this
proxy statement to their customers, and Eastern will reimburse these brokers
and nominees for their related out-of-pocket expenses. This proxy statement and
the accompanying proxy card are being mailed to shareholders on or about March
16, 2000.

Outstanding Shares and Voting Power

   At the close of business on March 7, 2000, the record date fixed by the
Board for determining shareholders entitled to notice of and to vote at the
2000 Annual Meeting of Shareholders, Eastern had

                                       6
<PAGE>

outstanding 27,137,772 shares of Common Stock. Under Article 11 of the
Declaration of Trust of Eastern, a quorum for the consideration of questions to
be presented to the 2000 Annual Meeting of Shareholders shall consist of the
holders of a majority of shares of Common Stock issued and outstanding,
provided that less than a quorum may adjourn the meeting from time to time.
Votes cast by proxy or in person at the 2000 Annual Meeting of Shareholders
will be counted by persons appointed by Eastern to act as election inspectors
for the meeting.

   Article 24 of the Declaration of Trust of Eastern provides that:

     "Shares of this trust which by the provisions of this Declaration are
  entitled to vote upon any question shall be entitled to one vote per share
  in person or by proxy, except that the election of Trustees by the Common
  Stock shall be by cumulative voting, namely, each holder of Common Stock
  will be entitled to as many votes as will equal the number of his shares
  multiplied by the number of Trustees to be elected, and he may cast all of
  such votes for a single candidate or distribute them among any two or more
  candidates as he shall elect."

   The three nominees for election as Trustees at the 2000 Annual Meeting who
receive the greatest number of votes properly cast will be elected as Trustees.
Proxies withholding authority to vote for one or more nominees will thus have
no effect on the outcome of the election.

   The approval of the amendment to the Eastern Declaration of Trust and the
merger agreement each requires the majority vote of the outstanding shares of
Eastern Common Stock.

   If you fail to vote, or vote to abstain, it will have the same legal effect
as a vote cast against the approval of the amendment to the Eastern Declaration
of Trust and the merger agreement. Your broker and, in many cases, your nominee
will not have discretionary power to vote on these proposals. Accordingly, you
should instruct your broker or nominee how to vote. A broker non-vote will have
the same effect as a vote against the approval of the amendment to the Eastern
Declaration of Trust and the merger agreement.

   If there are insufficient votes to approve the merger agreement or the
amendment to Eastern's Declaration of Trust at the Annual Meeting, your proxy
may be voted by the persons named in the proxy to adjourn the meeting in order
to solicit additional proxies in favor of approval of the above matters if you
voted in favor of the above matters or gave no voting instructions. If the
meeting is adjourned or postponed for any purpose, at any subsequent
reconvening of the meeting your proxy will be voted in the same manner as it
would have been voted at the original convening of the meeting unless you
withdraw or revoke your proxy. Your proxy may be voted in this manner even
though it may have been voted on the same or any other matter at a previous
meeting.

Voting and Revocation of Proxies

   You may revoke your proxy at any time before it is exercised by (i) filing
with the Secretary of Eastern an instrument revoking it, (ii) submitting a
properly executed proxy bearing a later date or (iii) voting in person at the
meeting. Subject to this revocation, all of your shares represented by a
properly executed proxy received by the Secretary of Eastern will be voted in
accordance with your instructions. If a proxy is properly executed and received
by the Secretary of Eastern, but no instructions are indicated, then the proxy
will be voted to approve and adopt the above matters and in the manner as the
persons named on the enclosed proxy card in their discretion determine upon
such other business as may properly come before the meeting or any adjournment
or postponement of the meeting.

   Your shares will be voted by proxy at the Annual Meeting if your proxy card
is properly signed, dated and presented for validation of the Secretary of
Eastern prior to the meeting.

                                       7
<PAGE>

 I.  PROPOSAL 1: AMENDMENT TO EASTERN'S DECLARATION OF TRUST TO AUTHORIZE
     CERTAIN MERGERS

   The Board recommends that you vote "FOR" the amendment to Eastern's
Declaration of Trust as described in this proposal.

   Eastern is a Massachusetts business trust and not a corporation. Eastern is
governed by a Declaration of Trust rather than an Articles of Organization. The
proposed amendment to Section 38 of the Declaration of Trust would permit the
form of merger contemplated by the merger agreement. The first clause of the
revised Section 38 would read (with the amended language in italics) as
follows:

   "Section 38. Voluntary Termination or Amendment of Trust. The Trustees may
   terminate this trust at any time, or may cause this trust to be merged into
   or consoldiated with another company or may cause or permit a Massachusetts
   limited liability company or any other company to merge into or consolidate
   with this trust under or pursuant to any state or federal statute, if such
   termination, merger or consolidation has been authorized by vote of at least
   a majority of the outstanding Common Stock;"

   The text of the existing Article 38 and the proposed language changes and
the text of the proposed new Article 38 are included in Appendix D.

   To become effective, the proposed amendment to the Eastern Declaration of
Trust must be approved by an affirmative vote of shareholders holding a
majority of the outstanding shares. The Board has unanimously approved the
amendment.

II.  PROPOSAL 2: THE MERGER

   The Board recommends that you vote FOR the approval and adoption of the
merger agreement.

                              GENERAL DESCRIPTION

   At the effective date of the merger, ACJ Acquisition will be merged with and
into Eastern. Eastern will be the surviving entity and will be a wholly-owned
subsidiary of KeySpan. As a result of the merger, you will receive $64.00 in
cash, without interest, for each share of Eastern Common Stock that you own,
unless you are entitled to and have perfected your dissenters' appraisal
rights. You will also receive an additional $0.006 per share for each day the
merger has not closed beginning on the later of (a) August 4, 2000 or (b)
ninety days after the State of New Hampshire gives final regulatory approval of
the merger. This aggregate additional amount will be reduced by the aggregate
amount of any per share increase in any dividend actually paid that is
attributable to any period in which the additional amount accrues. Shares held
by Eastern, KeySpan and any of KeySpan's wholly-owned subsidiaries will be
canceled in the merger.

                            BACKGROUND OF THE MERGER

   During the past several years, the Board has regularly reviewed and
evaluated Eastern's long-term objectives and strategy, particularly in light of
the energy industry's trend toward deregulation and consolidation. That review
and evaluation led Eastern previously to follow a strategy of remaining
independent while acting as a consolidator of local gas distribution utility
companies in New England. However, this process did not foreclose consideration
of other strategic options designed to enhance shareholder value.

   At the request of Management, representatives of Salomon Smith Barney made a
presentation to the Board on July 28, 1999 regarding various strategies for
increasing shareholder value, as they had previously done in the summer of
1998. Following this presentation, and a discussion thereof by members of the
Board and Eastern management, it was the conclusion of the Board that
management should review the potential for enhancing shareholder value through
a strategic transaction or other means and that Salomon Smith Barney should be
retained to assist management in this review.

                                       8
<PAGE>

   Following the meeting, representatives of management conferred with Salomon
Smith Barney to negotiate an engagement agreement pursuant to which Salomon
Smith Barney would act as Eastern's financial adviser in connection with its
review of strategic alternatives and as its exclusive adviser with respect to a
possible sale of all or a portion of Eastern. This agreement was executed
effective August 13, 1999.

   On August 16, 1999, Eastern issued a press release in which it announced
that it was beginning the process of evaluating a number of strategic and
financial alternatives to enhance shareholder value. The press release
indicated that Eastern's strategic process would include an assessment of
Eastern's then-current strategy of consolidating New England gas distribution
utilities, as well as consideration of other strategic transactions, including
joint ventures or a sale of all or a portion of Eastern. The press release
noted that, "as a result of the dramatic changes taking place within the
utility industry, Eastern's Board of Trustees and management believe now is a
prudent time to undertake a review of all of Eastern's options."

   Following retention by Eastern, Salomon Smith Barney identified a number of
potential strategic partners for Eastern and, after reviewing such potential
partners with Eastern's management and Board, contacted these parties,
including KeySpan, to determine their initial interest in a possible
transaction.

   In order to proceed, all interested parties were required to sign
confidentiality and standstill agreements and information concerning Eastern
and its subsidiaries was furnished to such parties in early September 1999.
Salomon Smith Barney provided progress updates to the Board at meetings held on
September 22, 1999 and October 13, 1999. At the October 13, 1999 Board meeting,
Salomon Smith Barney reported that a number of companies, including KeySpan,
had submitted non-binding initial indications of interest in a strategic
transaction with Eastern, including initial proposed pricing terms and proposed
forms of consideration. Salomon Smith Barney also proposed a tentative
timetable for completion of the strategic process.

   Salomon Smith Barney provided another update on the strategic process to the
Board at an October 27, 1999 Board meeting. At this meeting, it was reported
that a number of potential strategic partners had visited or were scheduled to
visit Boston and had conducted or were scheduled to conduct due diligence
reviews and had attended or were scheduled to attend management presentations
regarding Eastern's businesses. Among these potential strategic partners was
KeySpan, representatives of which had participated in due diligence reviews and
attended management presentations in Boston on October 20 and 21, 1999.

   Salomon Smith Barney reported again to the Board at a telephonic meeting
held on November 1, 1999. At this meeting, after reviewing the process that had
been undertaken since they had been retained to assist Eastern in its review of
strategies to enhance shareholder value, Salomon Smith Barney reported that two
companies, including KeySpan, had recently provided to Salomon Smith Barney new
unsolicited binding offers to acquire Eastern at prices significantly higher
than those previously offered.

   Following this report, the Board, members of management and Eastern's
financial and legal advisers reviewed the relative merits of the two offers
that had been received. As a result of such review, it was determined by the
Board that the two binding offers that had been received were at price levels
and included transaction terms that were sufficiently attractive to cause the
Board to amend and accelerate the strategic process and timetable previously
being followed by Eastern. The Board instructed management to commence
intensive negotiations with KeySpan and the other bidder. Additionally,
representatives of management instructed Salomon Smith Barney to, and Salomon
Smith Barney did, contact all the other parties who were actively participating
in the process to inform them that certain developments had occurred that
required the acceleration of the process.

   Pursuant to such instructions, members of Eastern's management, with
assistance from their financial and legal advisers, met with representatives of
KeySpan and the other bidder to attempt to negotiate acceptable terms of a
merger agreement.

   Thereafter, at a meeting of the Board held on November 3, 1999, Eastern's
management and its financial and legal advisers reported that discussions with
KeySpan had resulted in an increase in KeySpan's offer price

                                       9
<PAGE>

for Eastern and satisfactory resolution of other outstanding issues. Further,
the Board was informed that although the offer prices in both bids was
comparable, discussions with the other bidder had not resulted in an acceptable
resolution of the key issues relating to such company's offer. Finally, it was
reported that a third company had submitted a binding offer since the November
1, 1999 Board meeting, but that such binding offer was below the prices
proposed in the offers from KeySpan and the other bidder.

   Following these reports, and a discussion thereon, Eastern's management
indicated that it recommended that the Board accept the KeySpan offer as the
superior offer, subject to negotiation of final language of the merger
agreement. Eastern's legal advisors reviewed the key terms and conditions of
the proposed transactions with KeySpan and the other bidder, including
conditions to closing, limitations on Eastern's ability to consider alternative
transactions and provisions regarding termination and termination fees, among
others. In addition, Salomon Smith Barney representatives made a presentation
concerning the proposed transaction with KeySpan and provided an oral opinion,
which was subsequently confirmed in writing, to the effect that as of
November 3, 1999, the Merger Consideration was fair from a financial point of
view to Eastern's shareholders.

   Following these reports and deliberations thereon, the Board voted
unanimously to accept the KeySpan proposal.

   Eastern signed the merger agreement with KeySpan and related documents
shortly before 6:00 a.m. on November 4, 1999, and at 8:45 a.m. that morning,
Eastern and KeySpan jointly announced that they had executed the merger
agreement. The merger agreement was subsequently amended as of January 26, 2000
to require shareholder approval of the amendment to Eastern's Declaration of
Trust in order to consummate the merger with KeySpan in the form set forth in
the merger agreement.

                           THE BOARD'S RECOMMENDATION

   The Eastern Board has unanimously approved the merger agreement and
recommends that the shareholders of Eastern approve the merger agreement. In
approving the merger agreement, the Board has determined that the merger, the
merger agreement and merger-related transactions are advisable, fair and in the
best interests of Eastern and its shareholders.

   THE BOARD UNANIMOUSLY RECOMMENDS THAT YOU VOTE FOR THE APPROVAL AND ADOPTION
OF THE MERGER AGREEMENT.

Eastern's Reasons for the Merger

   The Board believes that the terms of the merger agreement and the merger are
advisable, fair to and in the best interests of Eastern and its shareholders.
In deciding to recommend the merger agreement, the Board considered a number of
factors, including the following:

  .  The Board considered the value of the consideration to be received by
     Eastern's shareholders in the merger. The Board considered historical
     market prices and trading information for Eastern's stock, the price per
     share offered by KeySpan, the certainty of value provided by the cash
     consideration and the fact that the Merger Consideration represents a
     significant premium over the market prices at which Eastern's Common
     Stock has previously traded, including, but not limited to, the fact
     that the $64.00 per share cash consideration represented a 24.9% premium
     over the $51.25 closing price on November 2, 1999, the last trading day
     before Eastern's Board approved the merger agreement, and a 62% premium
     over the closing price on August 13, 1999, the last trading day prior to
     Eastern's August 16, 1999 press release. The Board also took into
     account the "ticking fee" provided for in the merger agreement, which
     increases the amount paid for each Eastern share by $0.006 for each day
     the merger has not closed beginning on the later of (a) August 4, 2000
     and (b) the date ninety days after the State of New Hampshire gives
     final regulatory approval of the merger. This aggregate additional
     amount, however, will be reduced by the aggregate amount of any per
     share increase in any dividend actually paid that is attributable to any
     period in which the additional amount accrues.

                                       10
<PAGE>

  .  The Board considered information (including the views of management)
     concerning Eastern's past, current and projected financial performance,
     financial condition, business operations and overall prospects.

  .  The Board considered the limited closing conditions under the merger
     agreement and the relative likelihood that these conditions could be
     satisfied and KeySpan would be able to close the merger in a timely
     manner.

  .  The Board considered the opinion of Salomon Smith Barney dated November
     3, 1999, as to the fairness, from a financial point of view, of the
     Merger Consideration to Eastern shareholders, and further considered the
     related financial analysis performed by Salomon Smith Barney, as
     described under "Opinion of Eastern's Financial Advisor."

  .  The Board considered the extensive transaction evaluation process
     Eastern had pursued with multiple potential merger partners and the
     resulting offers it received from other potential acquirors.

   The Eastern Board also considered potential negative aspects of the merger
agreement, including the following:

  .  The Board considered restrictive provisions of the merger agreement,
     including the restrictions relating to solicitation of third party
     proposals and the termination provisions. Although the Board determined
     that the terms of the merger agreement were favorable to Eastern's
     shareholders, the Board recognized that the provisions limiting Eastern
     from soliciting alternative proposals and the provisions requiring
     Eastern to pay KeySpan up to $65 million as a termination fee would
     decrease the likelihood that a third party would offer to acquire
     Eastern. Nonetheless, the Board believed that such provisions were in
     the best interests of Eastern's shareholders because they induced
     KeySpan to enter into the merger agreement and enhanced the likelihood
     that the merger would be accomplished, providing Eastern's shareholders
     with the benefits of the Merger Consideration. The Board also noted that
     termination fee provisions are customary in merger agreements,
     particularly when the target company has the right, as does Eastern, to
     terminate the merger agreement if its Board, in the exercise of its
     fiduciary duties, decides termination is required because of another
     acquisition proposal. The Board determined that the amount of the
     termination fee and the circumstances under which it would be paid were
     customary in transactions of the size and nature of this merger and
     would not preclude the unsolicited submission of an alternative
     proposal.

  .  The Board considered the risk that the Merger Consideration is fixed and
     will not be adjusted in the event of an increase or decrease in the
     market price of Eastern's Common Stock or the value of Eastern's
     business. The Board recognized that fixed Merger Consideration in a
     transaction such as this merger is not unusual and that the fixed Merger
     Consideration, while creating some risk to Eastern's shareholders, could
     also operate to benefit Eastern's shareholders.

   The above discussion of factors considered by the Board is not exhaustive,
but Eastern believes it includes the material factors considered by the Board.
The Board did not quantify or otherwise attempt to assign relative weights to
the special factors the Board considered in reaching its decision to recommend
the merger. The Board's position and recommendation are based on the total
information presented to and considered by it.

KeySpan's Reasons for the Merger

   The purpose of KeySpan engaging in the merger transaction is to acquire 100%
ownership of Eastern. KeySpan formed ACJ Acquisition solely for this purpose.

Certain Benefits and Detriments of the Merger

   As a result of the merger, all equity interests in Eastern will be owned by
KeySpan through its ownership of ACJ Acquisition. After the merger is complete,
you will no longer have any interest in and will not be

                                       11
<PAGE>

shareholders of Eastern, and, therefore, will not participate in Eastern's
future earnings and potential growth. Instead, you will have the right to
receive $64.00 in cash, without interest, for each share held (other than
shares in respect of which appraisal rights have been perfected). Each
shareholder will also receive an additional $0.006 per share for each day the
merger has not closed beginning on the later of (a) August 4, 2000 or (b)
ninety days after the State of New Hampshire gives final regulatory approval of
the merger. This aggregate additional amount will be reduced by the aggregate
amount of any per share increase in any dividend actually paid that is
attributable to any period in which the additional amount accrues.

   As a result of the merger, the Eastern Common Stock will no longer be traded
on the New York Stock Exchange, Boston Stock Exchange or Pacific Stock Exchange
and price quotations for sales of shares in the public market will no longer be
available. The registration of the Eastern Common Stock under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), will terminate, and
Eastern will no longer file periodic or annual reports.

Financing of the Merger

   The total amount of funds required by KeySpan to complete the merger,
including fees and expenses incurred in connection therewith, is expected to be
approximately $1,708,700,000. ACJ Acquisition expects to obtain such funds from
KeySpan.

                     OPINION OF EASTERN'S FINANCIAL ADVISOR

   Eastern engaged Salomon Smith Barney to act as its exclusive financial
advisor in connection with the merger. On November 3, 1999, Salomon Smith
Barney delivered an oral opinion (confirmed in writing in an opinion dated the
same date) to the effect that, as of such date, the Merger Consideration was
fair, from a financial point of view, to the Eastern shareholders.

   The full text of the written opinion of Salomon Smith Barney dated November
3, 1999 is attached as Appendix B to this proxy statement and explains the
assumptions made, procedures followed, matters considered and limitations on
the review undertaken by Salomon Smith Barney. You are urged to read the
Salomon Smith Barney opinion in its entirety. The Salomon Smith Barney opinion
is directed only to the fairness, from a financial point of view, of the Merger
Consideration to holders of Eastern Common Stock and does not constitute a
recommendation as to how you should vote at the Annual Meeting. The summary of
the opinion in this proxy statement is qualified in its entirety by reference
to the full text of the opinion, which is attached hereto as Appendix B and is
incorporated into this proxy statement by reference.

   In connection with rendering its opinion, Salomon Smith Barney reviewed and
analyzed, among other things, the following:

  .  a copy of a draft of the merger agreement dated November 3, 1999;

  .  certain publicly available information concerning Eastern, including its
     Annual Reports on SEC Form 10-K for each of the years in the three-year
     period ended December 31, 1998;

  .  internal information prepared by Eastern, primarily financial in nature,
     including projections, concerning the business and operations of Eastern
     and its operating subsidiaries, furnished to Salomon Smith Barney by
     Eastern for purposes of its analysis;

  .  publicly available information concerning the trading of, and the
     trading market for, Eastern Common Stock;

  .  publicly available information with respect to certain other companies
     that Salomon Smith Barney considered relevant to its inquiry and the
     trading markets for certain of those other companies' securities; and

                                       12
<PAGE>

  .  publicly available information concerning the nature and terms of other
     transactions that Salomon Smith Barney considered relevant to its
     inquiry.

   Salomon Smith Barney also considered other information, financial studies,
analyses, investigations and financial, economic and market criteria that it
deemed relevant. Salomon Smith Barney also met with officers and employees of
Eastern to discuss the foregoing as well as other matters that it believed
relevant to its inquiry.

   In its review and analysis and in arriving at its opinion, Salomon Smith
Barney assumed and relied upon the accuracy and completeness of all of the
financial and other information provided to it or publicly available. Salomon
Smith Barney has not attempted independently to verify and has not assumed any
responsibility for verifying any of that information. Further it has relied
upon the assurances of the management of Eastern that they are not aware of any
facts that would make any of that information inaccurate or misleading. Salomon
Smith Barney has not conducted a physical inspection of any of the properties
or facilities of Eastern. In addition, it has not made or obtained or assumed
any responsibility for making or obtaining any independent evaluation or
appraisal of any properties or facilities, nor has it been furnished with any
such evaluations or appraisals of those properties or facilities.

   With respect to financial projections, Salomon Smith Barney has been advised
by the management of Eastern and has assumed that the financial projections
were reasonably prepared and reflect the then best available estimates and
judgment of the management of Eastern, as to the future financial performance
of Eastern. Salomon Smith Barney expresses no view with respect to such
projections or the assumptions on which they were based. Salomon Smith Barney
has also assumed that the merger will be completed in a timely manner and in
accordance with the terms of the merger agreement.

   In conducting its analysis and arriving at its opinion as expressed in this
proxy statement, Salomon Smith Barney has considered such financial and other
factors as it deemed appropriate under the circumstances. Salomon Smith Barney
has also taken into account its assessment of general economic, market and
financial conditions as well as its experience in connection with similar
transactions and securities valuation generally. In arriving at its opinion,
Salomon Smith Barney has not ascribed a specific consolidated range of values
to Eastern. Salomon Smith Barney has not been asked to consider, and its
opinion does not address, the relative merits of the merger as compared to any
alternative business strategy that might exist for Eastern. Salomon Smith
Barney's opinion necessarily is based upon conditions as they exist and can be
evaluated as of the date of the opinion, and Salomon Smith Barney assumes no
responsibility to update or revise its opinion based upon circumstances or
events occurring after the date of the opinion. Its opinion is limited to the
fairness, from a financial point of view, of the Merger Consideration to
holders of Eastern Common Stock and does not address Eastern's underlying
business decision to effect the merger or constitute a recommendation of the
merger to Eastern.

   In connection with its opinion, Salomon Smith Barney performed various
financial analyses, which it presented to and discussed with the Board on
November 3, 1999. The material portions of the analyses performed by Salomon
Smith Barney in connection with the rendering of its opinion are summarized
below.

Historical Trading Analysis

   Salomon Smith Barney reviewed information regarding historical stock price
performance for Eastern Common Stock. Salomon Smith Barney noted that for the
52-week period beginning on November 1, 1998 and ending on November 1, 1999,
the range for Eastern Common Stock was from a daily closing price low of $33.50
to a daily closing price high of $51.19. Salomon Smith Barney also noted that
during the period beginning November 1, 1998 and ending on August 13, 1999 (the
trading day immediately prior to the announcement that Eastern was exploring
its strategic alternatives) the daily closing price high for Eastern Common
Stock was $44.00.

Public Market Valuation Analysis

   Using publicly available information, Salomon Smith Barney performed a
public market valuation analysis for Eastern's gas utility segment which is
comprised of Boston Gas Company, Colonial Gas Company, Essex

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<PAGE>

Gas Company, EnergyNorth, Inc., Eastern's utility-related non-regulated
businesses (which include ServicEdge Partners, Inc., Transgas, Inc., AMR Data
Corporation, EnergyNorth Natural Gas, Inc., EnergyNorth Propane, Inc. and ENI
Mechanicals, Inc.) (EnergyNorth, Inc. and its subsidiaries were included in the
analysis as if Eastern's pending acquisitions of EnergyNorth, Inc. was
consummated as of the first day of the relevant period) and Eastern's
headquarters. This analysis was based on a selected range of multiples derived
from the following group of companies that Salomon Smith Barney determined to
be comparable to Eastern's gas utility segment:

 Gas Utility Comparable Companies

  .  AGL Resources Inc.

  .  Atmos Energy Corporation

  .  New Jersey Resources Corporation

  .  Nicor, Inc.

  .  ONEOK, Inc. (pro forma for its proposed merger with Southwest Gas
     Corporation)

  .  Peoples Energy Corporation

  .  Piedmont Natural Gas Company, Inc.

  .  Washington Gas Light Company

   Salomon Smith Barney's analysis of Eastern's gas utility comparable
companies resulted in the following selected reference ranges of multiples:

  .  a range of multiples of common stock price to earnings per share ("P/E
     multiples") based on estimated 1999 and 2000 earnings per share figures
     of 14.5x to 17.0x and 13.5x to 15.0x, respectively;

  .  a range of multiples of price per share to book value per share as of
     June 30, 1999 of 1.7x to 2.0x;

  .  a range of dividend yields of 5.0% to 4.0%;

  .  a range of multiples of firm value to EBITDA (earnings before interest,
     taxes, depreciation and amortization) for the latest twelve months as of
     June 30, 1999 ("LTM") of 7.5x to 8.5x; and

  .  a range of multiples of firm value to LTM EBIT (earnings before interest
     and taxes) of 10.5x to 12.5x.

   Salomon Smith Barney applied these selected reference ranges of multiples to
Eastern's gas utility segment's estimated 1999 pro forma earnings per share
figure, estimated 2000 pro forma earnings per share figure, pro forma June 30,
1999 book value per share figure, dividend yield figure, pro forma LTM EBITDA
and pro forma LTM EBIT (the pro forma figures factor in the pro forma impact of
the Colonial Gas and EnergyNorth acquisitions as if they were consummated on
the first day of such period, and as if the EnergyNorth acquisition were
consummated in accordance with the terms of the merger agreement between
Eastern and EnergyNorth dated July 14, 1999, without giving effect to changes
to such terms related to the proposed KeySpan merger).

   Using publicly available information, Salomon Smith Barney also performed a
public market valuation analysis for Eastern's inland marine transportation
segment which is comprised of Midland Enterprises Inc. and its subsidiaries.
This analysis was based on a selected range of multiples derived from the
following group of companies that Salomon Smith Barney determined to be
comparable to Eastern's inland marine transportation segment:

 Inland Marine Transportation Comparable Companies

  .  Kirby Corporation

  .  Alexander & Baldwin, Inc.

                                       14
<PAGE>

  .  OMI Corporation

  .  Maritrans Inc.

  .  Burlington Northern Santa Fe Corporation

  .  Union Pacific Corporation

  .  Norfolk Southern Corporation

  .  CSX Corporation

  .  Canadian National Railway Company

   Salomon Smith Barney's analysis of Eastern's inland marine transportation
comparable companies resulted in the following selected reference ranges of
multiples:

  .  a range of multiples of firm value to LTM EBITDA of 6.5x to 7.5x;

  .  a range of firm value to 1999 EBITDA multiples of 6.0x to 7.0x;

  .  a range of multiples of firm value to LTM EBIT of 11.5x to 15.0x; and

  .  a range of P/E multiples based on estimated 1999 and 2000 earnings per
     share figures of 12.5x to 15.5x and 11.0x to 14.0x, respectively.

   Salomon Smith Barney applied these selected reference ranges of multiples to
Eastern's inland marine transportation segment's LTM EBITDA, 1999 EBITDA, LTM
EBIT and estimated 1999 and 2000 earnings per share figures.

   Estimated 1999 and 2000 earnings per share figures for Eastern's two
business segments were based on forecasts provided by Eastern's management.
Estimated 1999 and 2000 earnings per share figures for the gas utility
comparable companies and inland marine transportation comparable companies were
based on consensus estimates published by First Call Corporation.

   Based on the analyses described above, Salomon Smith Barney derived an
implied equity value range per share of Eastern Common Stock of $38.00 to
$44.00.

Precedent Transactions Valuation Analysis

   Using publicly available information, Salomon Smith Barney performed an
analysis of (i) selected acquisition transactions in the gas utility industry
announced since 1997 and (ii) selected acquisition transactions in the inland
marine transportation industry announced since 1998.

 Gas Utility Precedent Transactions

   Salomon Smith Barney used the following transactions in the gas utility
industry as precedents:

  .  Southern Union Company's acquisition of Fall River Gas Company

  .  SEMCO Energy, Inc.'s acquisition of ENSTAR Natural Gas Company and
     Alaska Pipeline Company

  .  Eastern's acquisition of EnergyNorth, Inc.

  .  Energy East Corporation's acquisition of CTG Resources, Inc.

  .  Wisconsin Energy Corporation's acquisition of WICOR, Inc.

  .  Northeast Utilities' acquisition of Yankee Energy System, Inc.

  .  Southern Union Company's acquisition of Pennsylvania Enterprises, Inc.


                                       15
<PAGE>

  . Energy East Corporation's acquisition of Connecticut Energy Corporation

  . SCANA Corporation's acquisition of Public Service Company of North
    Carolina, Incorporated

  . ONEOK Corporation Inc.'s acquisition of Southwest Gas Corporation

  . Carolina Power& Light Company's acquisition of North Carolina Natural Gas
    Corporation

  . Eastern's acquisition of Colonial Gas Company

  . Eastern's acquisition of Essex County Gas Company

  . NIPSCO Industries Inc.'s acquisition of Bay State Gas Company

   Salomon Smith Barney's analysis of precedent transactions in the gas utility
industry resulted in the following selected reference ranges of multiples:

  . a range of P/E multiples based on estimated 1999 and 2000 earnings per
    share figures of 21.0x to 25.0x and 20.0x to 23.0x, respectively;

  . a range of multiples of price per share to book value per share of 2.4x
    to 2.8x;

  . a range of multiples of firm value to LTM EBITDA of 9.5x to 11.5x; and

  . a range of multiples of firm value to LTM EBIT of 14.0x to 18.0x.

   Salomon Smith Barney applied these selected reference ranges of multiples to
Eastern's gas utility segment's estimated 1999 pro forma earnings per share
figure, estimated 2000 pro forma earnings per share figure, pro forma June 30,
1999 book value per share figure, pro forma LTM EBITDA and pro forma LTM EBIT
(the pro forma figures factor in the pro forma impact of the Colonial Gas and
EnergyNorth acquisitions as if they were consummated on the first day of such
period, and as if the EnergyNorth acquisition was consummated in accordance
with the terms of the merger agreement between Eastern and EnergyNorth dated
July 14, 1999, without giving effect to changes to such terms related to the
proposed KeySpan merger).

 Inland Marine Transportation Precedent Transactions

   Salomon Smith Barney used the following transactions in the inland marine
transportation industry as precedents:

  . Investor Group (National Marine Inc.)'s acquisition of American
    Commercial Lines LLC

  . Kirby's acquisition of Hollywood Marine, Inc.

   Salomon Smith Barney's analysis of precedent transactions in the inland
marine transportation industry resulted in the following selected reference
ranges of multiples:

  . a range of multiples of firm value to LTM EBITDA of 6.5x to 8.0x;

  . a range of firm value to 1999 EBITDA multiples of 6.5x to 8.0x;

  . a range of multiples of firm value to LTM EBIT of 11.0x to 13.0x; and

  . a range of firm value to 1999 EBIT multiples of 11.0x to 13.0x.

   Salomon Smith Barney applied these selected reference ranges of multiples to
Eastern's inland marine transportation segment's LTM EBITDA, 1999 EBITDA, LTM
EBIT and 1999 EBIT.

   Based on the analyses described above, Salomon Smith Barney derived an
implied equity value range per share of Eastern Common Stock of $54.00 to
$62.50.

Discounted Cash Flow Analysis

   Salomon Smith Barney performed a discounted cash flow analysis of Eastern to
estimate a range of values for the Eastern Common Stock. The discounted cash
flow analysis for Eastern was based upon certain financial

                                       16
<PAGE>

forecasts for each of Eastern's gas utility segment and inland marine
transportation segment, for the years ended December 31, 2000 through December
31, 2004, prepared by the management of Eastern. The forecasts for Eastern's
gas utility segment assume that the EnergyNorth acquisition will be consummated
in accordance with the terms of the merger agreement between Eastern and
EnergyNorth dated July 14, 1999, without giving effect to changes to such terms
related to the proposed KeySpan merger. In order to value the cash flows
generated beyond 2004, Salomon Smith Barney calculated a terminal year value
for Eastern by applying (i) a range of P/E multiples of 15.5x to 16.5x to
terminal year net income for Eastern's gas utility segment, and then added to
those values the outstanding debt (net of cash) as of the end of the terminal
year, and (ii) a range of EBITDA multiples of 6.0x to 7.0x to terminal year
EBITDA for Eastern's inland marine transportation segment. The unleveraged free
cash flow amounts for the years ended December 31, 2000 to December 31, 2004,
plus the terminal values, were then discounted to the present using a range of
discount rates of 7.25% to 8.25% for Eastern's gas utility segment and 8.0% to
9.0% for Eastern's inland marine transportation segment, based upon an analysis
of the weighted average cost of capital for Eastern's gas utility segment and
inland marine transportation segment, respectively. Analysis of the forecasts
for Eastern, without considering any benefits derived from the merger,
indicated an implied equity value range per share of Eastern Common Stock of
$47.75 to $54.75.

Present Value of Hypothetical Future Stock Price and Dividends Analysis

   Salomon Smith Barney calculated hypothetical Eastern Common Stock prices in
2004 based on Eastern management's 2004 earnings per share estimates and a
range of P/E multiples of 15.0x to 17.0x. Salomon Smith Barney then calculated
the net present values of these hypothetical future stock prices and the
dividends projected to be paid through 2004, assuming dividends at present
levels through 2004 and using a 10% discount rate. Based on this analysis,
Salomon Smith Barney derived a range of $49.00 to $54.75 for the present value
of Eastern's future stock price and dividends.

   The summary set forth above is not and does not purport to be a complete
description of the analyses underlying Salomon Smith Barney's opinion or its
presentation to the Eastern Board. The preparation of a fairness opinion is a
complex process involving subjective judgments and is not susceptible to
partial analysis or summary descriptions. Salomon Smith Barney made no attempt
to assign specific weights to particular analyses or factors considered, but
rather made qualitative judgments as to the significance and relevance of all
the analyses and factors considered and determined to give its fairness opinion
as described above. Accordingly, Salomon Smith Barney believes that its
analyses and the summary set forth above must be considered as a whole and that
selecting portions of its analyses and the factors considered by it, without
considering all such analyses and factors, could create an incomplete view of
the processes underlying the analyses set forth in its opinion. In addition, no
company used in the public market valuation analysis summarized above is
identical to Eastern or any of its business segments and no transaction used in
the precedent transactions valuation analysis summarized above is identical to
the KeySpan merger. In addition, Salomon Smith Barney may have deemed various
assumptions more or less probable than other assumptions, so that the ranges of
valuations resulting for any particular analysis described above should not be
taken to be Salomon Smith Barney's view of the actual value of Eastern.
Accordingly, an analysis of the data described above is not purely
mathematical, but necessarily involves complex considerations and judgments
concerning differences in financial and operating characteristics of Eastern or
any of its business segments and other facts that could affect the public
trading value or the acquisition value of the companies to which it is being
compared.

   In performing its analyses, Salomon Smith Barney made numerous assumptions
with respect to industry performance, general business, financial, market and
economic conditions and other matters, many of which are beyond the control of
Eastern. The analyses which Salomon Smith Barney performed are not necessarily
indicative of actual values or actual future results, which may be
significantly more or less favorable than suggested by such analyses. Such
analyses were prepared solely as part of Salomon Smith Barney's analysis of the
fairness, from a financial point of view, of the Merger Consideration to
holders of Eastern Common Stock. The analyses do not purport to be appraisals
or to reflect the prices at which a company or any of its businesses

                                       17
<PAGE>

might actually be sold or the prices at which any securities may trade at the
present time or at any time in the future. In addition, the opinion of Salomon
Smith Barney and Salomon Smith Barney's presentation to the Eastern Board were
among the many factors taken into consideration by the Eastern Board in making
its determination to approve the merger.

   Pursuant to an engagement letter dated August 13, 1999, Eastern agreed to
pay to Salomon Smith Barney:

  (1)  a retainer fee of $250,000, which was payable upon execution of the
       engagement letter;

  (2)  a fee of $1,750,000, payable following the execution of the merger
       agreement;

  (3)  a fee of $1,750,000, payable following shareholder approval of the
       merger; and

  (4)  a transaction fee equal to 0.71% of the transaction value (which is
       defined in the engagement letter to be the per share proceeds to be
       received by the Eastern common shareholders multiplied by the number
       of fully-diluted shares outstanding at the time of closing) of the
       merger, payable upon consummation of the merger.

   The fee described in clause (4) above is payable less any fees previously
paid under clauses (1), (2) and (3). Eastern also agreed, subject to certain
limitations, to reimburse Salomon Smith Barney for all reasonable fees and
disbursements of Salomon Smith Barney's counsel and all of Salomon Smith
Barney's reasonable travel and other out-of-pocket expenses incurred in
connection with its engagement, and agreed to indemnify Salomon Smith Barney
and certain related persons against various liabilities, relating to or arising
out of its engagement, including liabilities under the federal securities laws.

   Salomon Smith Barney is an internationally recognized investment banking
firm that provides financial services in connection with a wide range of
business transactions. As part of its business, Salomon Smith Barney regularly
engages in the valuation of companies and their securities in connection with
mergers and acquisitions, negotiated underwritings, competitive biddings,
secondary distributions of listed and unlisted securities, private placements
and other purposes. In the ordinary course of its business, Salomon Smith
Barney may actively trade the securities of Eastern and KeySpan for its own
account and the accounts of its customers and, accordingly, may at any time
hold a long or short position in such securities.

   In addition, Salomon Smith Barney and its affiliates have rendered certain
investment banking and financial advisory services to Eastern and KeySpan for
which Salomon Smith Barney received customary compensation. Salomon Smith
Barney and its affiliates (including Citigroup Inc.) may have other business
relationships with Eastern, KeySpan and their affiliates. Salomon Smith Barney
acted as financial advisor to Colonial Gas Company and EnergyNorth in
connection with their sale to Eastern. The Eastern Board retained Salomon Smith
Barney based on Salomon Smith Barney's expertise in the valuation of companies
as well as its substantial experience in transactions such as the merger.

                    MATERIAL FEDERAL INCOME TAX CONSEQUENCES

   The following discussion summarizes the material United States federal
income tax considerations relevant to the merger that are generally applicable
to the holders of Eastern Common Stock. This discussion is based on currently
existing provisions of the Internal Revenue Code of 1986, as amended (the
"Code"), existing and proposed Treasury Regulations thereunder and current
administrative rulings and court decisions, all of which are subject to change.
Any such change, which may or may not be retroactive, could alter the tax
consequences to the holders of Eastern Common Stock as described herein. This
summary is limited to United States Persons (as defined below) who hold their
Eastern Common Stock as a capital asset, and whose functional currency is the
United States dollar. This discussion does not address the United States
federal income tax consequences to certain persons subject to special treatment
under the federal income tax law, including, but not limited to, tax-exempt
organizations, dealers in securities or currencies, regulated investment
companies, real estate investment trusts, real estate mortgage investment
conduits, financial asset securitization investment trusts, financial

                                       18
<PAGE>

institutions, persons subject to alternative minimum tax, insurance companies,
persons holding their stock as a part of a hedging, conversion, short sale or
integrated transaction or a straddle, or holders who acquired their Eastern
Common Stock pursuant to the exercise of an employee stock option or otherwise
as compensation. In addition, this summary does not discuss the tax
consequences of the merger under state, local or foreign law.

   "United States Person" means:

  . a citizen or resident of the United States,

  . a corporation or partnership created or organized in or under the laws of
    the United States or any political subdivision thereof,

  . an estate that is subject to United States federal income taxation
    without regard to the source of its income,

  . a trust that is subject to the supervision of a court within the United
    States and the control of one or more United States persons, or

  . a trust that has a valid election in effect under applicable United
    States Treasury Regulations to be treated as a United States person.

   The receipt of the Merger Consideration in the merger by holders of Eastern
Common Stock will be a taxable transaction for federal income tax purposes.
Each holder's gain or loss per share of Eastern Common Stock will be equal to
the difference between the holder's tax basis in that particular share of the
Eastern Common Stock and the amount of cash received therefor. Such gain or
loss generally will be a capital gain or loss assuming the Eastern Common Stock
is held as a capital asset at the effective time of the merger. In the case of
individuals, trusts and estates, such capital gain will be subject to a maximum
federal income tax rate of 20% for shares of Eastern Common Stock held for more
than one year prior to the date of disposition.

   Unless a holder of Eastern Common Stock complies with certain reporting
and/or certification procedures or is an exempt recipient under applicable
provisions of the Code and Treasury Regulations, cash payments in exchange for
such holder's Eastern Common Stock in the merger may be subject to "backup
withholding" at a rate of 31% for federal income tax purposes. Any amounts
withheld under the backup withholding rules may be allowed as a refund or a
credit against the holder's federal income tax liability, provided the required
information is furnished to the Internal Revenue Service.

   The foregoing tax discussion is included for general information only and is
based upon present law. The foregoing discussion does not discuss tax
consequences under the laws of states or local governments or any other
jurisdiction or of tax consequences to categories of shareholders that may be
subject to special rules. Each holder of Eastern Common Stock should consult
such holder's own tax advisor concerning the specific tax consequences of the
merger to such holder, including the application and effect of federal, state,
local and other tax laws and the possible effect of changes in such tax laws.

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<PAGE>

                      POTENTIAL CONFLICTS AND INTERESTS OF
                      OFFICERS AND TRUSTEES IN THE MERGER

General

   The executive officers of Eastern and members of the Board may be deemed to
have interests in the merger that are in addition to their interests as
shareholders of Eastern generally. The Board was aware of these interests,
summarized below, and considered them, among other matters, in approving the
merger agreement and the transactions contemplated by the merger agreement.

Officer Change of Control Agreements

   Eastern is party to change of control agreements (each, a "COC Agreement")
with each of Messrs. Ives, Raskin, Flaherty, Cook, Law and Messer, the
executive officers of Eastern (each an "Executive" and collectively, the
"Executives"), which were amended and restated effective September 22, 1999.
Each Executive's employment under the COC Agreement runs for a period beginning
on the earlier of (1) the date Eastern enters into a definitive agreement, the
transactions contemplated by which will, when consummated, constitute a Change
of Control (as defined therein) or (2) the date which precedes the Change of
Control by six months (the "Effective Date"), and ending 24 months after the
Change of Control. Pursuant to each COC Agreement, in the event of a Change of
Control, each Executive will be immediately vested in all shares of restricted
stock of Eastern awarded to such Executive and in all stock options held by
such Executive under Eastern's 1982 or 1995 Stock Option Plans (each described
below). Additionally, if, during the term of the Executive's employment under
the COC Agreement, the Executive terminates his employment for Good Reason or
Eastern terminates the Executive's employment other than for Cause (in the case
of Mr. Messer, if Boston Gas terminates his employment other than for Cause and
in the case of Mr. Cook, if Midland Enterprises terminates his employment other
than for Cause), Eastern will provide to the Executive the severance payments
and benefits described below.

   The consummation of the transactions contemplated by the merger agreement
will constitute a Change of Control. Accordingly, if an Executive's employment
is terminated as described above prior to the Change of Control or within 24
months thereafter, the Executive will be entitled to receive: (1) a lump sum
cash payment equal to three times the annual rate at which the Executive was
being paid his base salary immediately prior to such termination or immediately
prior to the Effective Date, whichever is greater; (2) a lump sum cash payment
equal to three times the Executive's total target benefit(s) or the equivalent
as specified in the COC Agreement under the annual bonus or incentive plan in
which the Executive was participating for the period including the date of
termination or three times the Executive's total target benefit(s) or the
equivalent as specified in the COC Agreement under the annual bonus or
incentive plan in which the Executive was participating for the period
including the Effective Date, whichever is greater; (3) a lump sum cash amount
equal to the product of the Executive's total target benefit(s) or the
equivalent as specified in the COC Agreement for the period including the date
of termination times a fraction, the numerator of which is the number of days
elapsed in such bonus or incentive period prior to the date of termination, and
the denominator of which is 365; (4) any salary, bonuses, or other payments
earned by the Executive but not yet paid as of the date of termination; (5) for
a period of 36 months following termination (or until at least equivalent
benefits are made available by another employer), medical, dental, life-
insurance, disability and other welfare benefits plans and programs at a level
of benefits at least as favorable to the Executive and the Executive's family
as those available to the Executive and the Executive's family immediately
prior to termination or immediately prior to the Effective Date (whichever is
more favorable to the Executive and the Executive's family); (6) if the
Executive would have satisfied any service requirement for retiree benefits
assuming continued service for the 36-month period and if at the end of that
period the Executive would be at least age 52, retiree health, dental, life and
other retiree benefits (upon termination of the benefits provided under
subsection (5) above) that are not less favorable (and on terms not less
favorable) to the Executive and the Executive's family than those available to
eligible retirees and their families under the retiree benefit program of
similar type as in effect immediately

                                       20
<PAGE>

prior to the date of termination or the Effective Date, if more favorable; (7)
the right to purchase the automobile, if any, supplied to the Executive by
Eastern or its subsidiaries in connection with the Executive's employment (or
any automobile substituted therefor) at its "blue book" value (in the case of
Mr. Raskin, he has use of his company automobile for 24 months following
termination and then the option to purchase such automobile); (8) payment for
the costs of an out-placement service (in the case of Mr. Cook, Midland
Enterprises pays this benefit and in the case of Mr. Messer, Boston Gas pays
this benefit); and (9) the reimbursement of costs and expenses, including
reasonable attorney's fees, incurred by the Executive in disputes with respect
to benefits or matters under the COC Agreement. Except in the case of Mr. Ives,
each COC Agreement provides that benefits will be supplemented by an additional
payment to "gross up" the Executive for any excise tax under the "golden
parachute" tax provisions of the Code, unless a reduction in the Executive's
cash benefits of not more than 10% would result in elimination of the excise
tax (in which case the Executive's cash benefits will be so reduced). Under the
terms of his COC Agreement, Mr. Ives' employment will be deemed to be
terminated, without cause, upon the closing of the merger and he will be
entitled to the benefits described above. However, Mr. Ives' COC Agreement does
not provide for the gross-up payment described above; instead, Mr. Ives'
benefits are subject to a cap to avoid the excise tax. If the merger were to
close on August 1, 2000, the Executives could receive cash and benefits valued
at approximately the following amounts in respect of items 1 through 6
described above, plus the tax "gross up" amounts, if such officers were
terminated or were deemed to be terminated (under the circumstances described
above) in connection with the merger: Mr. Ives, $3,632,925; Mr. Raskin,
$4,534,693; Mr. Messer, $1,588,203; Mr. Flaherty, $3,030,115; Mr. Cook,
$2,248,276; and Mr. Law, $1,742,192.

   Eastern has established a trust to make payments to certain officers of
Eastern and its subsidiaries under Eastern's Supplemental Executive Retirement
Plan ("SERP"), its 1994 Deferred Compensation Plan for officers and its
Supplemental Retirement Plan for Certain Officers and payments to Trustees
under Eastern's former Retirement Plan for Non-Employee Trustees and its
Deferred Compensation Plan for Non-Employee Trustees, and makes contributions
to such trust from time to time. Such Plans provide that upon a change of
control (as defined therein, which includes the closing of the merger), Eastern
is obligated to fund such trust fully by depositing therein sufficient funds to
pay the present value of all benefits to those who have retired prior to the
change of control, plus the present value of all retirement benefits that would
be payable if all eligible officers and Trustees had retired prior thereto,
plus the aggregate of the account balances under such deferred compensation
plans. As of January 31, 2000, the balance held in such trust was approximately
$13 million.

KeySpan Board Seat

   Pursuant to the merger agreement, Mr. Ives will become a member of KeySpan's
Board of Directors upon consummation of the merger.

Supplemental Executive Retirement Plan

   Under the terms of the SERP, each Executive is entitled to receive an
annuity commencing at retirement at or after age 55 (the "Retirement Benefit").
Each Executive's Retirement Benefit is based on his age upon termination of
employment and is generally equal to a percentage (based on service) of his
average compensation for those five years in which his compensation was highest
(selected from among the prior ten years), minus offsets for certain other
retirement benefits. The age 55 eligibility requirement is waived in connection
with a Change of Control; however, payments for officers under 55 years of age
will not commence until such Executives reach the age of 55. Also, an Executive
entitled to severance under a COC Agreement will be credited for SERP purposes
with an additional three years of pay and deemed service under the COC
Agreement. As of August 1, 2000, the following Executives could receive
approximately the following incremental monthly SERP amounts (assuming a 50%
joint and survivor annuity) if such officers were terminated or retired for
good reason under circumstances entitling them to enhanced SERP benefits after
the merger: Mr. Ives, $0; Mr. Raskin, $17,093; Mr. Messer, $1,166; Mr.
Flaherty, $10,601; Mr. Cook, $0; and Mr. Law, $870. Mr. Ives' benefit does not
increase because he has reached the maximum benefit level under the

                                       21
<PAGE>

plan. Mr. Cook receives no SERP benefit because he does not have sufficient
years of service with Eastern to qualify. The increases in benefits to Messrs.
Raskin and Flaherty reflect the fact that these Executives would have no SERP
benefit prior to age 55 absent the Change of Control.

1994 Deferred Compensation Plan

   The Eastern Enterprises 1994 Deferred Compensation Plan provides that each
participant may elect to defer up to 20% of his base salary and up to all of
his cash bonuses. Eastern also matches a portion of the base salary that a
participant has elected to defer, subject to certain limitations in the plan. A
participant may elect, subject to certain conditions, to have his or her
account distributed upon termination of employment in annual installments or in
a lump sum. Executives' balances under the Plan as of December 31, 1999 are as
follows: Mr. Ives, $660,636; and Mr. Messer, $141,139.

1982 and 1995 Stock Option Plans

   Pursuant to the COC Agreements described above, the options granted to the
Executives under the 1982 and 1995 Stock Option Plans will accelerate and
become immediately exercisable in connection with the merger, regardless of the
availability of KeySpan options. Pursuant to the merger agreement, each option
that is vested and exercisable on or before the merger may be exchanged for the
difference between (a) the Merger Consideration and (b) the exercise price per
share of such option. All options not cashed out will be assumed by KeySpan and
become exercisable for shares of KeySpan common stock. Based on accelerated
vesting and assuming each Executive elects to receive cash for all accelerated
options, as described above, the following Executives will be entitled to
receive the following amounts of cash based upon unvested options outstanding
on February 25, 2000: Mr. Ives, $921,465; Mr. Raskin, $1,093,896; Mr. Messer,
$500,197; Mr. Flaherty, $730,272; Mr. Cook, $397,875; and Mr. Law, $509,078.

1992 Restricted Stock Plan

   Under the terms of the 1992 Restricted Stock Plan, participants may be
granted shares of Eastern Common Stock which, prior to vesting, may not be
transferred and are subject to forfeiture if employment with Eastern terminates
for any reason. Mr. Cook is the only Executive with outstanding restricted
stock. Pursuant to the COC Agreements described above, upon the merger all
outstanding shares of restricted stock awarded to the Executives will become
free of the transfer and forfeiture provisions. Based on accelerated vesting
and conversion upon the merger of the restricted stock held on February 25,
2000, Mr. Cook will be entitled to receive $153,600.

Deferred Compensation Plan for Trustees

   The Eastern Deferred Compensation Plan for Trustees provides that each non-
employee Trustee may elect to defer cash retainers or meeting fees. Accounts
are payable following departure from the Board either in installments or in a
lump sum. Deferred amounts may be held in a Cash Account and/or in a Share Unit
Account (each as defined in the plan). Former officers and employees of Eastern
and its subsidiaries are not eligible to participate in this plan. Prior to a
Change of Control, amounts credited to the Cash Account earn interest and
amounts credited to the Share Unit Account are notionally invested in shares of
Eastern Common Stock. In connection with a Change of Control, pursuant to a
plan amendment adopted in October 1999, Cash Accounts and Share Unit Accounts
may be invested in mutual fund vehicles. All distributions under the plan are
in cash. All shares of restricted stock held by the Trustees under the Eastern
Restricted Stock Plan for Non-Employee Trustees, except for 400 of such shares
held by Mr. Stone, were relinquished in exchange for vested Share Units under
the terms of a December 1999 amendment to the Deferred Compensation Plan for
Trustees. The account balances of eligible Trustees under the Plan would be
worth the following amounts if the merger had closed February 25, 2000: Mr.
Barker, $130,579; Mr. Curtin, $239,977; Mr. Frankenheim, $702,812; Mr. Jaskol,
$370,138; Mr. Knox, $178,759; Ms. Spence, $207,379; and Mr. Stone, $242,662.
Mr. Ives had an account balance of $193,916 as of December 31, 1999 for fees he
earned as a Trustee prior to becoming an Executive of Eastern.

                                       22
<PAGE>

1996 Non-Employee Trustees' Stock Option Plan

   Under the terms of the 1996 Non-Employee Trustees' Stock Option Plan and as
a result of action taken by the Board, all outstanding options under the plan
will become exercisable 20 days prior to the closing of the merger. Former
officers and employees of Eastern or its subsidiaries are not eligible to
participate in this plan. Pursuant to the merger agreement, each option that is
exercisable on or before the merger may be exchanged for the difference between
the Merger Consideration and the exercise price per share. Options not cashed
out will be assumed by KeySpan and become exercisable for shares of KeySpan
common stock. If the merger closed on February 25, 2000, and assuming each
Trustee had elected to receive cash for all accelerated options as described
above, he or she would be entitled to receive the following amounts of cash,
based on the number of unvested options outstanding on such date: Mr. Barker,
$58,055; Mr. Curtin, $58,055; Mr. Frankenheim, $58,055; Mr. Jaskol, $58,055;
Mr. Knox, $58,055; Ms. Spence, $58,055; and Mr. Stone, $58,055.

Restricted Stock Plan for Non-Employee Trustees

   Under the Restricted Stock Plan for Non-Employee Trustees (the "Trustee RS
Plan"), Trustees have been awarded restricted shares that contain transfer
restrictions and are subject to forfeiture in the case of a Trustee who resigns
or declines to stand for re-election, except under certain circumstances. In
the event of a Change of Control (including the merger), all outstanding shares
of restricted Common Stock held by Trustees will become free of the transfer
restrictions and forfeiture provisions. Mr. Stone holds 400 restricted shares
of Eastern stock. All other Trustees who previously held shares of restricted
stock under this plan have elected to relinquish their shares of restricted
stock in exchange for vested Share Units under the terms of a December 1999
amendment to the Deferred Compensation Plan for Trustees as described above.

Officers' and Trustees' Indemnification Insurance

   The merger agreement provides that after the effective time, the surviving
corporation will indemnify the present and former officers, Trustees, directors
and employees of Eastern and its subsidiaries from liabilities arising out of
actions or omissions in their official capacity prior to the effective time of
the merger, to the full extent permitted under Massachusetts law or as provided
in Eastern's or its subsidiary's organizational documents. In addition, the
surviving entity will maintain Trustees' and officers' insurance coverage for
six years after the effective time on terms no less favorable to such
indemnified parties than existing insurance coverage to the extent such
coverage may be purchased for an amount equal to or less than 200% of the
current premium being paid by Eastern.

                              THE MERGER AGREEMENT

General Description

   At the effective time of the merger, ACJ Acquisition will be merged with and
into Eastern. Eastern will be the surviving corporation and will continue under
the name "Eastern Enterprises." As a result of the merger, you will receive
$64.00 in cash, without interest, for each share of Eastern Common Stock that
you own, unless you are entitled to and have perfected your dissenters'
appraisal rights. You will also receive an additional $0.006 per share for each
day the merger has not closed beginning on the later of (a) August 4, 2000 or
(b) ninety days after the State of New Hampshire gives final regulatory
approval of the merger. This aggregate additional amount will be reduced by the
aggregate amount of any per share increase in any dividend actually paid that
is attributable to any period in which the additional amount accrues. Shares
held by Eastern, KeySpan and any of KeySpan's wholly-owned subsidiaries will be
canceled in the merger.

Certain Terms of the Merger Agreement

   The following describes the material terms of the merger agreement, as
amended and in effect on the date of this proxy statement. The full text of the
merger agreement is attached to this proxy statement as Appendix A and is
incorporated herein by reference. Eastern encourages you to read the entire
merger agreement.

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<PAGE>

   Effective Time of the Merger. The merger agreement provides that the closing
of the merger will take place on the second business day immediately following
the satisfaction or waiver of the conditions to the merger or at such other
time, date and place as Eastern and KeySpan shall mutually agree. At the
closing, the necessary documents will be filed with public officials to
complete the merger. Eastern expects that, if all conditions to the merger have
been satisfied or waived, the effective time could occur between June and
October 2000, although in the event of regulatory or other delays, the
effective time could occur as late as 2001.

   General. The merger agreement provides that, subject to satisfaction of
several conditions, ACJ Acquisition will be merged with and into Eastern, and
that following the merger, the separate existence of ACJ Acquisition will cease
and Eastern will continue as the surviving entity. At the effective time, and
subject to the terms and conditions set forth in the merger agreement:

  .  the shareholders of Eastern will receive $64.00 in cash, without
     interest, for each share of Eastern Common Stock that they own, other
     than shares held by shareholders who are entitled to and have perfected
     their dissenters' appraisal rights. Eastern Shareholders will also
     receive an additional $0.006 per share for each day the merger has not
     closed beginning on the later of (a) August 4, 2000 or (b) ninety days
     after the State of New Hampshire gives final regulatory approval of the
     merger (provided, however, that the aggregate additional amount will be
     reduced by the aggregate amount of any per share increase in any
     dividend actually paid that is attributable to any period in which the
     additional amount accrues). Shares held by Eastern, KeySpan and any of
     KeySpan's wholly-owned subsidiaries will be canceled in the merger; and

  .  the Eastern Common Stock will no longer be publicly traded.

   Surrender and Exchange of Stock Certificates. As soon as practicable after
the effective time of the merger, the surviving entity will deposit with
BankBoston, the exchange agent, an amount of cash equal to the aggregate amount
of Merger Consideration to be paid to holders of Eastern Common Stock. Promptly
after the effective time of the merger, KeySpan's transfer agent and registrar,
as paying agent, will send to each holder of record of Eastern Common Stock
certificates a letter of transmittal containing instructions for use in
effecting the exchange of such holder's Eastern Common Stock certificates for
the Merger Consideration payable to such holder. Upon surrender to the paying
agent of an outstanding certificate or certificates which represent Eastern
Common Stock, together with the duly executed letter of transmittal and other
documents the paying agent may require, the holder of such certificate will be
entitled to receive the amount of Merger Consideration owed to the holder
pursuant to the merger agreement. In the event the Merger Consideration is to
be delivered to any person who is not the registered holder of the relevant
surrendered certificate, all documents required to evidence and effect such
transfer and prove all applicable transfer taxes have been paid must also be
delivered to the paying agent. No interest will be paid or accrue on any cash
payable to any holder of Eastern Common Stock certificates.

   Any portion of the Merger Consideration payable to holders of Eastern Common
Stock certificates which remains undistributed for one year after the effective
time shall be delivered to the surviving corporation. After that period of
time, any holder of Eastern Common Stock certificates who has not previously
exchanged his certificates may only look to KeySpan as a general creditor for
payment of that portion of the Merger Consideration owed to him or her under
the merger agreement.

   If you do not have your Eastern Common Stock certificate, you may make an
affidavit of that fact. In addition, the surviving entity may require that you
post a bond in a reasonable amount determined by the surviving corporation with
respect to the missing stock certificate. Upon receipt of the affidavit and any
required bond, the exchange agent will issue the Merger Consideration payable
to you.

   Representations and Warranties. The merger agreement contains customary
representations and warranties of Eastern relating to various aspects of its
business, financial statements and other matters, including, among other
things:

                                       24
<PAGE>

  .  its organization, qualification, good standing, authority and corporate
     power,

  .  its Declaration of Trust and bylaws,

  .  its capital structure,

  .  its subsidiaries,

  .  its authority to enter into and the validity and effectiveness of the
     merger agreement,

  .  the execution of the merger agreement and consummation of the
     transactions contemplated therein will not result in conflicts,
     violations, breaches or defaults under its Declaration of Trust, bylaws,
     any statute or law and other material agreements to which it, its
     subsidiaries or any of its joint ventures is a party or to which they
     are subject (subject to receipt of identified statutory and shareholder
     approvals),

  .  the consents and approvals required of certain governmental entities
     relating to the merger,

  .  the documents and reports filed with the SEC and the accuracy and
     completeness of the information contained therein,

  .  its compliance with applicable laws,

  .  the absence of certain changes since December 31, 1998,

  .  the absence of undisclosed liabilities,

  .  litigation,

  .  pension and benefit plans and other matters relating to the Employee
     Retirement Income Security Act of 1974,

  .  taxes,

  .  this proxy statement and the accuracy and completeness of the
     information contained herein,

  .  environmental matters,

  .  the applicability of regulations under the Public Utility Holding
     Company Act of 1935, the Federal Power Act, the Natural Gas Act and
     state utility laws,

  .  the inapplicability or waiver of anti-takeover laws and anti-takeover
     provisions of its Rights Agreement (as defined in the merger agreement),

  .  the shareholder vote required to amend the Declaration of Trust and to
     approve the merger,

  .  that it does not beneficially own any shares of KeySpan stock,

  .  its receipt of a fairness opinion from Salomon Smith Barney, and

  .  its year 2000 compliance.

   The merger agreement also contains customary representations and warranties
of KeySpan relating to various aspects of its business, including among other
things:

  .  its organization, qualification, standing, authority and corporate
     power,

  .  its authority to enter into and the validity and effectiveness of the
     merger agreement,

  .  the absence of conflicts, violations or defaults under its
     organizational documents, any laws or statutes and other material
     agreements, subject to receipt of identified statutory approvals,

  .  the consents and approvals required of certain governmental entities
     relating to the merger,

                                       25
<PAGE>

  .  its compliance with applicable laws,

  .  activities of ACJ Acquisition, its merger subsidiary,

  .  this proxy statement and the accuracy and completeness of the KeySpan
     information contained herein,

  .  the applicability of regulations under the Public Utility Holding
     Company Act of 1935, the Federal Power Act, the Natural Gas Act and
     state utility laws,

  .  that it has or will have available prior to the effective time of the
     merger sufficient cash in immediately available funds to pay the Merger
     Consideration, and

  .  the absence of beneficial ownership of shares of Eastern.

   Many representations and warranties expire at the effective time of the
merger, or upon the termination of the merger agreement in accordance with its
terms. However certain agreements shall survive the effective time of the
merger as described in the merger agreement.

   Conduct of Business Pending the Merger. Eastern has agreed that prior to
the merger, it and its subsidiaries will operate their respective businesses
in the ordinary course consistent with past practices and will use
commercially reasonable efforts to preserve intact their respective business
organizations, retain the services of their respective current officers and
employees, preserve the good will and relationships with customers and
suppliers and maintain their respective properties and assets.

   In addition, the merger agreement places specific restrictions on the
ability of Eastern and its subsidiaries to:

  .  declare or pay any dividends or other distributions in respect of its
     capital stock other than:

   .  dividends paid by any subsidiary to Eastern or KeySpan,

   .  regular quarterly dividends on Eastern Common Stock that do not exceed
      current regular dividends except that if the merger has not occurred
      on or before November 4, 2000, it can increase annual dividends by not
      more than $0.04 per share on an annual basis, or

   .  a special dividend payable on Eastern Common Stock if the effective
      time does not occur between a record date and payment date of a
      regular dividend not to exceed the amount specified in the merger
      agreement;

  .  split, combine, subdivide or reclassify any shares of capital stock, or
     issue or authorize or propose the issuance of any other securities in
     respect of, in lieu of or in substitution for shares of capital stock,
     or adopt a plan of complete or partial liquidation or resolutions
     providing for or authorizing such liquidation or a dissolution, merger,
     consolidation, recapitalization, restructuring or other reorganization,
     or repurchase, redeem or otherwise acquire any shares of capital stock;

  .  issue, agree to issue, sell, deliver, pledge, dispose of or otherwise
     encumber any shares of its capital stock or other securities convertible
     into or exchangeable for, or any rights, warrants or options to acquire
     such capital stock or equivalents other than the issuance of Eastern
     Common Stock upon the exercise of outstanding rights under option plans
     or stock purchase plans and dividend reinvestment plans, or, in the case
     of subsidiaries, the issuance of capital stock to Eastern or another
     subsidiary, or as may be required by Eastern's Rights Agreement;

  .  amend its Declaration of Trust, its subsidiaries' articles of
     organization or bylaws (or other governing documents);

  .  acquire or agree to acquire any business or any corporation,
     partnership, association or business organization or division thereof,
     whether by merger or consolidation or by purchasing capital stock or
     assets, or by any other manner other than in the ordinary course of
     business and unless the aggregate acquisition consideration is not more
     than $5,000,000;

                                      26
<PAGE>

  .  make capital expenditures in excess of 110% of the annual amount of
     capital expenditures budgeted by Eastern or its subsidiaries except as
     required by law or as reasonably deemed necessary following a
     catastrophic event;

  .  sell, lease or otherwise dispose of any assets other than encumbrances
     or dispositions in the ordinary course of business consistent with past
     practice;

  .  incur or guarantee any indebtedness for borrowed money or enter into any
     "keep well" or other agreement to maintain the financial statement
     condition of another person other than (1) short-term and other
     indebtedness and "keep well" assurances for the benefit of customers in
     the ordinary course of business consistent with past practice, (2)
     arrangements between Eastern and its subsidiaries or among subsidiaries
     or (3) in connection with refunding existing indebtedness at a lower
     cost of funds;

  .  except as may be required by applicable law or as expressly provided in
     the merger agreement:

   .  enter into, adopt or amend any employee benefit plan to increase the
      amount or accelerate the payment or vesting of any benefit or
      otherwise increase in any manner the compensation, incentive
      compensation opportunities or benefits of any Trustee, director,
      officer or employee except in accordance with any existing performance
      based compensation arrangements in the ordinary course of business
      consistent with past practice or normal increases in the ordinary
      course of business and consistent with past practice,

   .  enter into or amend any employment, severance or similar agreement
      with any Trustee, director or officer or other employee other than in
      the ordinary course of business consistent with current industry
      practice;

  .  change any accounting methods, except as required by law, rule,
     regulation or GAAP;

  .  modify, amend, terminate, renew or fail to use reasonable business
     efforts to renew any material contract or agreement to which it is a
     party or waive, release or assign its material rights or claims;

  .  take any action that would cause the transactions contemplated by the
     merger agreement to be subject to any takeover law and take all steps
     necessary to exempt such transactions from any applicable takeover law;

  .  terminate, amend, modify or waive any provision of any confidentiality
     or standstill agreement to which it is a party (and it is obligated to
     take all steps necessary to enforce the provisions of any such
     agreement);

  .  amend, modify or waive any provision of the Rights Agreement, and take
     any action to redeem the Rights or render the Rights inapplicable to any
     transaction other than the transactions contemplated by the merger
     agreement; and

  .  terminate or amend the agreement with EnergyNorth, Inc. or waive any
     rights thereunder.

   Furthermore, the merger agreement requires Eastern and its subsidiaries to:

  .  to the extent the following disclosures do not violate the
     Confidentiality Agreement (as defined in the merger agreement) or
     applicable law, confer on a regular basis with KeySpan to discuss
     material operational and business matters, promptly notify KeySpan of
     significant changes in its business, properties, assets, condition or
     results of operations, advise KeySpan of any change or event that could
     reasonably be expected to result in a Company Material Adverse Effect
     (as defined in the merger agreement) and provide KeySpan with copies of
     all filings with any governmental authority made in connection with the
     merger agreement;

  .  discuss with KeySpan any changes in its regulated rates or charges,
     standards of service or accounting and consult with KeySpan prior to
     making any filing, agreement or consent with governmental regulators
     with respect thereto, and shall not make any filing to change its rates
     or charges on file that would have an adverse effect on the benefits
     associated with the merger or a Company Material Adverse Effect; and

                                       27
<PAGE>

  .  maintain insurance in such amounts and against such risks and losses
     customary for companies engaged in gas utility and barge transportation
     industries.

   The merger agreement places certain restrictions on ACJ Acquisition with
respect to its conduct of business. KeySpan must cause ACJ Acquisition to
perform its obligations pursuant to the merger agreement and not to engage in
activities or enter into agreements or be bound by any obligation that is
inconsistent with the merger agreement.

   The merger agreement also prohibits KeySpan and its subsidiaries from
acquiring or agreeing to acquire a substantial portion of the assets or equity
of any business, corporation, partnership, association or other business
organization or division thereof if entering into such acquisition could
reasonably be expected to impose a material delay in obtaining, or materially
increase the risk of not obtaining, any authorizations of any governmental
authority necessary to complete the merger or adversely affect the ability of
KeySpan to obtain financing necessary to complete the merger.

   No Solicitation. Pursuant to the merger agreement, Eastern has agreed that
it and its subsidiaries:

  .  will not, and will not authorize or permit any of its Trustees,
     officers, employees, directors and other representatives (including
     Salomon Smith Barney) to, directly or indirectly, encourage, solicit,
     initiate, request or take any other action to facilitate any inquiries
     or the making of any proposal or offer which constitutes and may
     reasonably be expected to lead to an Alternative Proposal from any
     person or participate in any discussions or negotiations regarding any
     Alternative Proposal or accept an Alternative Proposal;

  .  will immediately cease and cause to be terminated any existing
     solicitation, initiation, encouragement, activity, discussions or
     negotiations with any parties conducted with a view of formulating an
     Alternative Proposal; and

  .  will immediately notify KeySpan orally and in writing of the receipt of
     any such inquiry, offer or proposals and the identity of the person
     making it within 24 hours of its receipt and shall keep KeySpan informed
     as to the status and details of such inquiry, offer or proposal.

  .  "Alternative Proposal" means a proposal or offer for a merger,
     acquisition, consolidation, reorganization, share exchange, tender
     offer, exchange offer or similar transaction involving Eastern or any of
     Eastern's significant subsidiaries (as defined in Rule 1-02(w) of
     Regulation S-X under the Exchange Act) or any proposal or offer to
     acquire in any manner, directly or indirectly (x) ten percent or more of
     the outstanding Shares of Eastern, or (y) 50% or more of the outstanding
     capital stock of any significant subsidiary of Eastern, or (z) all or a
     substantial portion of the assets of Eastern or of any significant
     subsidiary.

   However, the merger agreement does not prohibit Eastern, at any time prior
to the approval of the merger agreement by Eastern shareholders, from:

  .  engaging in discussion or negotiations with a third party who, without
     solicitation, initiation, encouragement, discussion or negotiation by or
     with Eastern or its representatives, seeks to initiate discussions or
     negotiations and Eastern may furnish the third party information
     concerning it and its business, properties and assets, only to the
     extent that,

   .  the third party has first made a bona fide written Alternative
      Proposal that, in the good faith judgment of a majority of the Board,
      is likely to be more favorable to Eastern's shareholders than the
      merger and as to which the Board has reasonably concluded that the
      third party will have adequate sources of financing to consummate such
      Alternative Proposal and a majority of the Board concludes in good
      faith, based upon the advice of outside counsel and such other matters
      as the Board deems relevant, that such actions are necessary for the
      Board to comply with its fiduciary duties to shareholders under
      applicable law, and

                                       28
<PAGE>

   .  prior to furnishing such information to, or entering into discussions
      or negotiations with, such person or entity, Eastern provides prompt
      notice to KeySpan to the effect that it intends to furnish information
      to, or intends to enter into discussions or negotiations with, such
      person or entity, and of the identity of the person or group making
      the Alternative Proposal and the material terms thereof and receives
      from such person an executed confidentiality agreement in reasonably
      customary form on terms not, in the aggregate, more favorable to such
      third party than the terms contained in the confidentiality agreement
      entered into between Eastern and KeySpan;

  .  complying with Rule 14e-2 under the Exchange Act with regard to a tender
     or exchange offer provided, further, that the Board shall not recommend
     that the shareholders of Eastern tender their shares of Common Stock in
     connection with any such tender or exchange offer unless a majority of
     the Board determines in good faith based on the advice of outside
     counsel that such action is necessary for the Board to comply with its
     fiduciary duties to shareholders under applicable law;

  .  accepting an Alternative Proposal from a third party, provided it
     terminates the merger agreement pursuant to the applicable provisions
     therein; or

  .  recommending an Alternative Proposal, in response to an unsolicited bona
     fide written Alternative Proposal from a third party which is likely to
     be more favorable to Eastern's shareholders than the merger and as to
     which the Board has reasonably concluded that the third party will
     have adequate sources of financing to consummate such Alternative
     Proposal or withdrawing or modifying in any adverse manner its approval
     or recommendation of the merger agreement if a majority of the Board
     determines in good faith based on the advice of outside counsel that
     such action is necessary for the Board to comply with its fiduciary
     duties to shareholders under applicable law.

   Nothing contained in the merger agreement gives KeySpan the right to control
or direct Eastern's operations prior to the effective time of the merger.

   Additional Agreements. The merger agreement contains the following
additional agreements:

  .  Access to Information. Upon reasonable notice and during normal business
     hours, Eastern and its subsidiaries will afford to the officers,
     directors, employees, agents and accountants of KeySpan reasonable
     access, throughout the period prior to the effective time, to all of its
     properties, books, contracts, commitments and records to the extent that
     Eastern or any of its subsidiaries 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 Eastern. During this
     period Eastern and its subsidiaries will furnish promptly to KeySpan (1)
     access to each report, schedule and other document filed or received by
     it or any of its subsidiaries pursuant to the requirements of federal or
     state securities laws or filed with or sent to the SEC, the Federal
     Energy Regulatory Commission ("FERC"), the Department of Justice, the
     Federal Trade Commission or any other federal or state regulatory agency
     or commission, and (2) access to all information concerning themselves,
     their subsidiaries, directors, officers and shareholders and such other
     matters as may be reasonably requested by KeySpan in connection with any
     filings, applications or approvals required or contemplated by the
     merger agreement. KeySpan and its subsidiaries and representatives will
     hold in strict confidence all evaluation material concerning Eastern
     furnished to it in connection with the transactions contemplated by the
     merger agreement in accordance with the confidentiality
     agreement entered into between Eastern (or its agent) and KeySpan, as it
     may be amended from time to time.

  .  Proxy Statement. Eastern and KeySpan made certain agreements with
     respect to the preparation of this proxy statement.

                                       29
<PAGE>

  .  Communication with Regulatory Authorities. Each party has agreed to
     promptly notify the other party of the receipt of any comments of any of
     the SEC, the FERC, the Department of Justice, the Federal Trade
     Commission or any other federal or state regulatory agency or commission
     or requests for additional information and will promptly provide to the
     other party copies of all correspondence between such party or any of
     its representatives and such regulatory agency or commission with
     respect to the regulatory filings. Each party is required to consult
     with the other party regarding regulatory filings and have due regard to
     any comments the other party may make in relation to any such regulatory
     filings. Each party will give the other party and its counsel the
     opportunity to review all responses to requests for additional
     information by, and replies to comments of, any regulatory agency or
     communication before their filing with, or being sent to, such
     regulatory agency or commission.

  .  Regulatory Matters. Each of KeySpan, Eastern and ACJ Acquisition is
     required to 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 no later than March 31, 2001,
     or September 30, 2001 in certain circumstances, all necessary permits,
     consents, approvals and authorizations of all governmental authorities
     and all other persons necessary or advisable to consummate the
     transactions contemplated by the merger agreement, including, without
     limitation, the statutory approvals that both Eastern and KeySpan are
     required to obtain.

  .  Shareholder Approval. Eastern agreed to take all necessary steps to
     call, give notice of, convene and hold the meeting of its shareholders
     to which this Notice and Proxy Statement relates and recommend the
     approval of the merger and the amendment of the Declaration of Trust to
     the Eastern shareholders.

  .  Trustees' and Officers' Indemnification. From and after the closing of
     the merger, KeySpan and Eastern (as the surviving entity) are required,
     to the fullest extent permitted by applicable law, to 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 closing of the merger,
     an officer, Trustee, director or employee of Eastern or any of its
     subsidiaries against (1) all losses, expenses (including reasonable
     attorney's fees and expenses), claims, damages or liabilities or,
     amounts paid in settlement, arising out of actions or omissions
     occurring at or prior to the closing of the merger (and whether asserted
     or claimed prior to, at or after the closing) that are, in whole or in
     part, based on or arising out of the fact that such person is or was a
     Trustee, director, officer or employee of Eastern or a subsidiary of
     Eastern and (2) all such indemnified liabilities to the extent they are
     based on or arise out of or pertain to the transactions contemplated by
     the merger agreement. KeySpan has agreed to pay the reasonable fees and
     expenses of counsel to any indemnified parties pursuant to this section.

   .  Insurance. For a period of six years after the closing of the merger,
      KeySpan will keep in effect policies of Trustees' and officers'
      liability insurance for the benefit of those persons who are currently
      covered by such policies of Eastern on terms no less favorable than
      the terms of such current insurance coverage. KeySpan may substitute
      policies of at least the same coverage containing terms that are no
      less advantageous with respect to matters occurring at or prior to the
      closing of the merger to the extent such liability insurance can be
      maintained annually at a cost to KeySpan not greater than 200 percent
      of the current annual premiums of the policies currently maintained by
      Eastern for their Trustees' and officers' liability insurance. If such
      insurance cannot be maintained or obtained at such cost, KeySpan shall
      maintain or obtain a policy providing the best coverage available, for
      a premium not exceeding 200 percent of the aggregate annual premiums
      currently paid by Eastern for their Trustees' and officers' liability
      insurance and other indemnity agreements. Alternatively, KeySpan may
      provide tail coverage for such persons which provides coverage for a
      period of six years for acts prior to the closing of the merger on
      terms no less favorable than the terms of such current insurance
      coverage.

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<PAGE>

   .  Successors. If KeySpan or any of its successors or assigns (1)
      consolidates with or merges into any other person and is not the
      continuing or surviving corporation or entity of such consolidation or
      merger or (2) transfers all or substantially all of its properties and
      assets to any person, then, and in either such case, proper provisions
      shall be made so that the successors and assigns of KeySpan shall
      assume the indemnity obligations described above.

   .  Survival of Indemnification. After the closing of the merger, all
      rights to indemnification in favor of the employees, agents, Trustees,
      directors and officers of Eastern, and its subsidiaries with respect
      to their activities as such prior to the closing of the merger, as
      provided in its respective charter document, by-laws or otherwise in
      effect on the date of the merger agreement will survive the closing of
      the merger and will continue in full force and effect for a period of
      not less than six years from such closing.

   .  Benefit. All indemnity provisions are intended to be for the benefit
      of, and will be enforceable by, each indemnified party, his or her
      heirs and his or her representatives.

  .  Reasonable Best Efforts. Each party agrees to cooperate and use its
     reasonable best efforts to take, or cause to be taken, all necessary or
     appropriate action, and to do, or cause to be done, all things
     necessary, under applicable laws and regulations or otherwise to
     consummate and make effective the merger and all other transactions
     contemplated by the merger agreement including, without limitation, the
     execution of any additional instruments necessary to consummate the
     transactions contemplated by the merger agreement and seeking to lift,
     rescind or reverse any legal restraint imposed on the consummation of
     the transactions contemplated by the merger agreement. In case at any
     time after the closing of the merger, any further action is necessary or
     desirable to carry out the purposes of the merger agreement, the proper
     officers and directors of each party are required take all such
     necessary action.

  .  Public Announcements. Eastern and KeySpan are required to cooperate with
     each other in the development and distribution of all news releases and
     other public information disclosures with respect to the merger
     agreement or any of the transactions contemplated by it and may not
     issue any public announcement or statement with respect to the merger
     agreement without the prior consent of the other party (which consent
     shall not be unreasonably withheld).

  .  Employee Benefits Plans.

   .  For a period of not less than twelve months immediately following the
      closing of the merger, KeySpan and Eastern (as the surviving entity)
      must provide or cause to be provided to those non-union employees of
      Eastern (and their family members, dependents and other beneficiaries)
      who continue to be employees of Eastern (as the surviving entity),
      KeySpan or their respective subsidiaries, coverages and benefits not
      less favorable and on terms that are not less favorable, in each case
      in the aggregate, than those provided or made available to these
      individuals immediately prior to the closing of the merger under
      Eastern's employee benefit plans.

   .  KeySpan and Eastern (as the surviving entity) are required to give or
      cause to be given to each non-union employee who continues to be an
      employee of Eastern (as the surviving entity), KeySpan or their
      respective subsidiaries 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, as applied to the employee benefit plans or
      arrangements maintained by KeySpan, Eastern (as the surviving entity)
      or their respective subsidiaries in which such non-union employee
      participates, for such employee's service with Eastern or any
      subsidiary of Eastern (or any prior employer) to the same extent
      recognized by the analogous Eastern employee benefit plan immediately
      prior to the closing of the merger and to the extent service with
      KeySpan or Eastern (as the surviving entity) is so recognized for
      other employees of KeySpan or Eastern (as the surviving entity) who
      participate in such plan.

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<PAGE>

   .  KeySpan and Eastern (as the surviving entity) are required to:

    --waive or cause to be waived all limitations as to preexisting
      conditions, exclusions and waiting periods with respect to
      participation and coverage requirements applicable to the non-union
      employees who continue to be employees of Eastern (as the surviving
      entity), KeySpan or their respective subsidiaries and their family
      members and dependents under the welfare benefit plans maintained or
      continued by KeySpan, Eastern (as the surviving entity) or their
      respective subsidiaries, except to the extent such limitations or
      waiting periods were already in effect with respect to these
      employees and had not been satisfied as of the closing of the merger
      under the corresponding Eastern employee benefit plan that is a
      welfare plan maintained for these employees immediately prior to the
      closing of the merger, and

    --provide or cause to be provided to each non-union employee who
      continues to be an employee of Eastern (as the surviving entity),
      KeySpan or their respective subsidiaries credit for any co-payments
      and deductibles paid during the year of but paid prior to the closing
      of the merger in satisfying any applicable deductible or out-of-
      pocket requirements under the Eastern employee benefit plans that are
      welfare plans in which these employees are eligible to participate
      after the closing of the merger.

   . Subject to certain provisions contained in the merger agreement,
     KeySpan and Eastern (as the surviving entity) agree to honor and to
     cause their respective subsidiaries to honor, from and after the
     closing of the merger, in accordance with their terms: (1) all Eastern
     employee benefit plans, (2) all collective bargaining agreements and
     (3) all other contracts, plans, arrangements or commitments with or for
     the benefit of officers, Trustees, directors or employees. Any
     workforce reductions affecting employees of Eastern carried out within
     the twenty-four-month period following the closing of the merger by
     KeySpan or Eastern (as the surviving entity) or their respective
     subsidiaries must be done in accordance with the provisions of the
     merger agreement, all applicable collective bargaining and other
     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 applicable state or local law.

   . Eastern and KeySpan agree to coordinate their executive incentive plans
     in order to assure that the officers and employees of Eastern and its
     subsidiaries entitled to participate in Eastern's incentive pay or
     other bonus plans receive on an equitable basis the benefits provided
     under such plan for the portion of the year in which the merger occurs
     during which they were officers or employees of Eastern or its
     subsidiaries.

  . Stock Options and Employee Benefits. As soon as practicable following the
    date of signing of the merger agreement, the Eastern Board (or if
    appropriate, any committee administering the Eastern stock option plans)
    must adopt resolutions or take other actions as may be required, if any,
    to effect the following:

   . In the case of each option outstanding immediately prior to the closing
     of the merger to purchase shares of Eastern Common Stock under the
     Eastern stock option plans, adjust the terms of these options to
     provide that, at the closing of the merger, it shall (except to the
     extent that KeySpan and the holder of these options otherwise agree in
     writing prior to the closing of the merger):

    --if such Eastern stock option is or becomes exercisable on or before
     the merger or as a consequence of the transactions contemplated by the
     merger agreement and the holder of these options shall have elected by
     written notice to KeySpan prior to the date 10 business days before
     the closing of the merger to receive the payment contemplated by this
     clause, be canceled in exchange for a payment from Eastern (as the
     surviving entity) equal to the product of (a) the total number of
     shares of Eastern Common Stock subject to the option and (b) the
     excess of the Merger Consideration over the exercise price per share
     of Eastern Common Stock subject to the option, payable in cash as soon
     as reasonably practicable following the closing of the merger; or

                                       32
<PAGE>

    --with respect to any option not canceled as discussed above, be
     assumed by KeySpan and thereby be deemed to constitute an option to
     acquire, on the same terms and conditions as were applicable
     immediately prior to the closing of the merger, KeySpan common stock,
     except that (a) each option will be exercisable for that number of
     whole shares of KeySpan common stock which equals (x) the number of
     shares of Eastern Common Stock subject to such option immediately
     prior to the closing of the merger multiplied by (y) the Option
     Exchange Ratio (as defined below), rounded down to the nearest whole
     number of shares of KeySpan common stock, and (b) the per share
     exercise price for the shares of KeySpan common stock issuable upon
     exercise of such the assumed option will be equal to (x) the exercise
     price per share of Eastern Common Stock under the option divided by
     (y) the Option Exchange Ratio, rounded up to the nearest whole cent.
     The parties to the merger agreement shall cooperate in giving the
     holders of the options adequate notice and opportunity to exercise
     their rights. KeySpan must take all corporate action necessary to
     reserve for issuance of a sufficient number of shares of KeySpan
     common stock for delivery upon exercise of options assumed by KeySpan.
     As soon as practicable after the closing of the merger, KeySpan must
     deliver to each holder of an Eastern option assumed by KeySpan an
     appropriate notice setting forth such holder's rights pursuant
     thereto. The term "Option Exchange Ratio" is defined as the ratio
     obtained by dividing (1) the average of the closing prices of the
     shares of Eastern Common Stock on the New York Stock Exchange
     Composite Transactions Reporting System, as reported in The Wall
     Street Journal, for the twenty (20) trading days immediately preceding
     the second trading day prior to the closing of the merger by (2) the
     average of the closing prices of the shares of KeySpan common stock on
     the New York Stock Exchange Composite Transactions Reporting System,
     as reported in the Wall Street Journal for the twenty (20) trading
     days immediately preceding the second trading day prior to the closing
     of the merger.

   .  It is intended that the Eastern options assumed by KeySpan will
      qualify following the closing of the merger as incentive stock options
      as defined in Section 422 of the Code to the extent the Eastern
      options qualified as incentive stock options immediately prior to the
      closing of the merger. These provisions relating to stock options will
      be applied consistent with such intent, including any adjustment of
      the conversion formula as is necessary in good faith to comply with
      Section 422 and 424(a) of the Code.

   .  Except as otherwise agreed to in writing by KeySpan and Eastern,
      Eastern must ensure that, to the extent consistent with applicable law
      (including, without limitation, the Code), following the closing of
      the merger, no holder of an Eastern option nor any participant in any
      Eastern stock option plan or any other plan, program or arrangement
      providing for the issuance or grant of any interest in respect of the
      capital stock of Eastern or any subsidiary shall have any right under
      such plans to acquire equity securities of Eastern as the surviving
      entity.

   .  KeySpan agrees to file a registration statement on Form S-8 for the
      shares of KeySpan common stock issuable with respect to assumed
      Eastern options as soon as reasonably practicable after the closing of
      the merger and must use its reasonable efforts to maintain the
      effectiveness of the registration statement thereafter for so long as
      any of the options or other rights remain outstanding.

  . Expenses. All costs and expenses incurred in connection with the merger
    agreement and the transactions contemplated by it shall be paid by the
    party incurring such expenses, except that those expenses incurred in
    connection with printing of this Proxy Statement, as well as the filing
    fee relating thereto, will be shared equally by Eastern and KeySpan.

  .  Further Assurances.

   .  KeySpan, Eastern and their respective subsidiaries will execute such
      further documents and instruments and take such further actions as may
      reasonably be requested by the other in order to consummate the merger
      and the other transactions contemplated by the merger agreement, and
      to use their reasonable best efforts to take or cause to be taken all
      actions, and to do or cause to be done all things necessary under
      applicable laws, and regulations to consummate and make effective the
      merger

                                       33
<PAGE>

      and the other transactions contemplated by the merger agreement (subject
      to the vote of Eastern's shareholders), including fully cooperating with
      the other in obtaining the required statutory approvals of both KeySpan
      and Eastern and all other approvals and authorizations of any
      governmental authorities necessary to consummate the transactions
      contemplated by the merger agreement.

   .  KeySpan and Eastern, respectively, are responsible for taking any
      action necessary to obtain the required statutory approvals for both
      KeySpan and Eastern, as the case may be. KeySpan and Eastern agree to
      cooperate in obtaining the necessary approvals from the SEC under the
      Public Utility Holding Company Act of 1935, the Securities Act of
      1933, as amended (the "Securities Act") and the Exchange Act and from
      the applicable state authorities under state "blue sky", securities or
      utility regulatory laws. KeySpan and Eastern will each provide the
      other with copies of any filings made with any governmental
      authorities in connection with the foregoing.

   .  If the only conditions to the parties' obligations to consummate the
      merger that are not satisfied or waived are receipt of any one or more
      of the required consents or statutory approvals for either Eastern or
      KeySpan and the adoption of an alternative structure (that otherwise
      substantially preserves for Eastern and KeySpan the economic benefits
      of the merger and does not result in materially more burdensome
      regulatory requirements) would result in such conditions being
      satisfied or waived, then the parties are required to cooperate to
      effect a business combination among themselves by means of a mutually
      agreed upon structure other than the merger that so preserves such
      benefits. Prior to closing any such alternative 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 must be obtained and all other conditions to the parties'
      obligations to consummate the merger, as applied to such alternative
      business combination, shall have been satisfied or waived.

  .  Corporate Offices. At and subsequent to the closing of the merger, the
     corporate headquarters of Eastern (as the surviving entity) shall be
     located in the greater Boston, Massachusetts area.

  .  Involvement in the Community. After the closing of the merger, KeySpan
     will, or will cause Eastern (as the surviving entity) to make at least
     $1,000,000 per year in charitable contributions to the communities
     served by Eastern (as the surviving entity) and otherwise maintain a
     substantial level of involvement in community activities in such
     communities that is similar to, or greater than, the level of community
     development and related activities carried on by Eastern and is
     consistent with the activities and programs currently supported by
     Eastern.

  .  Transition Steering Team. KeySpan and Eastern will create a special
     transition steering team, with representation from KeySpan and Eastern,
     that will develop recommendations concerning the future structure and
     operations of Eastern after the closing of the merger, subject to
     applicable law. The members of the transition steering team will be
     appointed by the Chief Executive Officers of KeySpan and Eastern. The
     functions of the transition steering team will include (1) to direct the
     exchange of information and documents between the parties and their
     subsidiaries and (2) the development of regulatory plans and proposals,
     corporate organizational and management plans, workforce combination
     proposals, and such other matters as they deem appropriate.

  .  Representation on KeySpan's Board.  KeySpan is required to take such
     action as may be necessary to permit J. Atwood Ives to serve on
     KeySpan's Board and must elect Mr. Ives to serve as a director.

   Conditions to the Merger. The respective obligations of each party to
complete the merger are subject to the satisfaction or waiver on or prior to
the closing of the merger of the following conditions:

  .  amendment to Eastern's Declaration of Trust to permit the merger;

  .  approval and adoption of the merger agreement and the amendment to the
     Declaration of Trust by the shareholders of Eastern;

                                       34
<PAGE>

  .  termination or expiration of the applicable waiting period (and any
     extension of the waiting period) under the Hart-Scott-Rodino Act of
     1976, as amended;

  .  no temporary restraining order, preliminary or permanent injunction,
     judgment or other order by any federal or state court preventing the
     consummation of the merger will be in effect and the merger and related
     transactions have not been prohibited by law; and

  .  all required statutory approvals are obtained and such approvals have
     become final orders that do not impose terms or conditions, which in the
     case of the State of New Hampshire approval, constitute a Company
     Material Adverse Effect and in the case of approval under the Public
     Utility Holding Company Act of 1935, constitute a Parent Material
     Adverse Effect.

  .  "Company Material Adverse Effect" means any change, event or effect that
     is materially adverse to the business, properties, financial condition
     or results of operations of Eastern and its subsidiaries taken as a
     whole (other than changes, events or effects that are the effect of
     economic factors affecting the economy as a whole or that are the effect
     of factors generally affecting the specific industries or markets in
     which Eastern and its subsidiaries operate or compete); provided,
     however, that a Company Material Adverse Effect shall not include any
     adverse effect primarily arising out of or resulting primarily from
     actions contemplated by the parties in connection with, or that are
     primarily attributable to the announcement of, the merger agreement and
     the transactions contemplated thereby.

  . "Parent Material Adverse Effect" means anything which would, individually
   or in the aggregate, reasonably be expected to have a material adverse
   effect on the ability of KeySpan to consummate the transactions
   contemplated by the merger agreement or materially delay consummation of
   such transactions.

   The obligation of KeySpan to effect the merger is further subject to the
satisfaction or waiver on or prior to the closing of the merger of the
following conditions:

  .  Eastern will have performed the agreements and covenants required to be
     performed by it under the merger agreement at or prior to the closing
     date of the merger;

  .  the representations and warranties of Eastern set forth in the merger
     agreement will be true and correct on and as of the closing date of the
     merger, except for any representations and warranties that address
     matters only as of a particular date and with respect to certain of the
     representations and warranties, except for failures which would not
     reasonably be expected to result in a Company Material Adverse Effect;

  .  KeySpan shall have received a certificate signed by certain officers of
     Eastern certifying that conditions relating to the performance of
     obligations and representations and warranties have been satisfied;

  .  subject to certain exceptions, there shall not exist any fact or
     circumstance that constitutes a Company Material Adverse Effect;

  .  Eastern having obtained the consents required by the merger agreement if
     the failure to receive such consents would reasonably be expected to
     have a Company Material Adverse Effect; and

  .  Eastern's acquisition of EnergyNorth, Inc. having been, or being
     simultaneously, consummated or Eastern shall have terminated the
     EnergyNorth acquisition agreement.

   The obligation of Eastern to effect the merger is subject to the
satisfaction or waiver on or prior to the closing of the merger of, the
following conditions:

  .  KeySpan shall have performed all of its agreements and covenants
     required by the merger agreement;

                                       35
<PAGE>

  .  the representations and warranties of KeySpan set forth in the merger
     agreement will be true and correct on and as of the closing date of the
     merger, except for any representations and warranties that address
     matters only as of a particular date and except for failures which would
     not reasonably be expected to result in a Parent Material Adverse
     Effect;

  .  Eastern shall have received a certificate signed by certain officers of
     KeySpan certifying that conditions relating to the performance of
     obligations and representations and warranties have been satisfied; and

  .  KeySpan will have obtained the consents required by the merger agreement
     if the failure to receive such consents would reasonably be expected to
     have a Parent Material Adverse Effect.

   Termination. The merger agreement may be terminated at any time prior to the
closing of the merger as follows:

  .  by mutual written consent of the Boards of Eastern and KeySpan;

  .  by either KeySpan or Eastern:

   .  by written notice, if the closing of the merger has not occurred by
      March 31, 2001. However, this right to terminate will not be available
      to any party whose failure to fulfill an obligation under the merger
      agreement has been the cause of or results in the failure of the
      closing of the merger to occur on the above date. The above date may
      be extended to September 30, 2001, if on March 31, 2001, the only
      conditions that must be satisfied are the obligations relating to the
      required statutory approvals;

   .  if any state or federal law, order, rule or regulation is adopted or
      issued which has the effect of prohibiting the merger or any court of
      competent jurisdiction in the United States issues a final and
      nonappealable order, judgment or decree permanently restraining,
      enjoining or otherwise prohibiting the merger;

  .  By Eastern:

   .  upon five days prior notice to KeySpan if Eastern receives a bona fide
      written alternative acquisition proposal and a majority of its Board
      determines in good faith that the Alternative Proposal is more
      favorable to the shareholders of Eastern than the merger and the Board
      reasonably believes there is adequate financing to consummate such
      proposal and on the basis of advice from outside counsel, the Board
      determines that the termination of the merger agreement is necessary
      to comply with its fiduciary duties under applicable law. In order to
      so terminate the merger agreement, the Board must be advised by
      outside counsel that its fiduciary duties require it to reconsider the
      commitment it currently has to consummate the merger agreement and
      Eastern must cause its advisors to negotiate with KeySpan during a
      five-day notice period to make adjustments to the merger agreement as
      would enable Eastern to continue with the transactions contemplated by
      the merger agreement. Eastern's ability to terminate the merger
      pursuant to this provision is also conditioned on its payment of the
      termination fees owed to KeySpan (as described below); and

   .  by written notice to KeySpan, if there are breaches of the
      representations and warranties of KeySpan which would or would
      reasonably be expected to result in a Parent Material Adverse Effect
      or there is a material breach of any agreement or covenant of KeySpan
      and such breach has not been remedied within 20 days after receipt by
      KeySpan of written notice from Eastern specifying the nature of the
      breaches and requesting that they be remedied;

  .  by KeySpan, by written notice to Eastern, if:

   .  there are breaches of certain representations and warranties of
      Eastern which would or would reasonably be expected to result in a
      Company Material Adverse Effect or material breaches of certain other
      representations and warranties of Eastern and those breaches are not
      remedied within 20 days after receipt by Eastern of written notice
      from KeySpan specifying the nature of the breaches and requesting that
      they be remedied;

                                       36
<PAGE>

   .  there is a material breach of any agreement or covenant of Eastern and
      the breach is not remedied within 20 days after receipt by Eastern of
      written notice from KeySpan specifying the nature of the breach and
      requesting that they be remedied;

   .  the Eastern Board or any committee of the Board withdraws or modifies,
      in a manner adverse to KeySpan, its approval or recommendation of the
      merger agreement or the transactions it contemplates, fails to
      reaffirm such approval or recommendation upon KeySpan's request,
      approves or recommends or takes no position with respect to an
      Alternative Proposal or resolves to take any of the actions described
      in this paragraph; and

   .  Eastern fails to obtain shareholder approval on or before June 30,
      2000.

 Termination Fees and Expenses.

  .  Eastern will be required to pay KeySpan's out-of-pocket expenses and
     fees (not to exceed $10 million) if Eastern terminates the merger
     agreement because in the good faith judgment of the Board, as advised by
     outside counsel, the Board determines termination is required due to a
     third party's acquisition proposal as discussed above or if KeySpan
     terminates the merger agreement due to Eastern's (1) failure to obtain
     shareholder approval by June 30, 2000, (2) breach of a representation or
     warranty which is likely to result in a Company Material Adverse Effect
     or breach of a material agreement or covenant or (3) Board or any
     committee of the Board withdrawing or modifying in any manner adverse to
     KeySpan, its approval of the merger or failing to reaffirm such approval
     or recommendation upon KeySpan's request or approving, recommending or
     failing to take a position regarding an Alternative Proposal as
     discussed above.

  .  Eastern will be required to pay KeySpan a termination fee of $65 million
     if (i) the merger agreement is terminated by Eastern due to an
     Alternative Proposal as discussed above; (ii) the merger agreement is
     terminated by KeySpan because Eastern's Board has withdrawn, modified in
     any manner adverse to KeySpan or approved, recommended or failed to take
     a position on an Alternative Proposal as discussed above; or (iii) if an
     Alternative Proposal has been made to Eastern by a third party and
     (A)(1)Eastern has failed to obtain shareholder approval for the merger
     by June 30, 2000, (2) Eastern has breached a representation or warranty
     which is likely to result in a Company Material Adverse Effect or breach
     of a material agreement or covenant or (3) Eastern terminated the merger
     agreement because the merger has not occurred by March 31, 2001 and (B)
     a definitive agreement is signed or a transaction is consummated with an
     alternative acquiror.

  .  The parties agree that the fees described above constitute liquidated
     damages and not a penalty. If any party is or becomes obligated to pay a
     termination fee pursuant to the first paragraph above, 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
     obligation. If the merger agreement is terminated by a party as a result
     of a willful breach of a representation, warranty, covenant or agreement
     by the other party, 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. If one party fails to promptly pay to the
     other any fee or expense due under the paragraph above, in addition to
     any out-of-pocket fees paid or payable, 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.

   Amendment. The merger agreement may be amended by the Boards of Eastern or
KeySpan, at any time before or after approval by the shareholders of Eastern
and prior to the closing of the merger, but after approval by Eastern's
shareholders only to the extent permitted by applicable law. The merger
agreement may not be amended except by an instrument in writing signed on
behalf of each of the parties hereto.

                                       37
<PAGE>

Anticipated Accounting Treatment

   The merger will be accounted for as a purchase for accounting and financial
reporting purposes.

Governmental and Regulatory Approvals

   The following is a summary of the material regulatory requirements affecting
the merger. Although Eastern and KeySpan have not yet filed for the required
approvals from all of the agencies discussed, it is anticipated that all
required regulatory approvals will be received by the middle of 2000.

   State Approvals and Related Matters. KeySpan, Eastern, EnergyNorth, Inc. and
EnergyNorth Natural Gas, Inc. made a joint filing with the New Hampshire Public
Utilities Commission on December 3, 1999, pursuant to applicable New Hampshire
law regarding the proposed transaction between KeySpan and Eastern and
Eastern's acquisition of EnergyNorth, Inc. Under the applicable statutes, the
New Hampshire Public Utilities Commission must determine that the EnergyNorth
acquisition will not have an adverse effect on rates, terms, service, or
operation of EnergyNorth Natural Gas, Inc. and is lawful, proper and in the
public interest. The New Hampshire Public Utilities Commission has, in prior
cases, approved mergers where there is no net harm to the public as a result of
the merger. In addition, New Hampshire law establishes a time-frame within
which the New Hampshire Public Utilities Commission must take action regarding
the proposed EnergyNorth acquisition. In accordance with that time frame, the
New Hampshire Public Utilities Commission must issue a final order within
approximately 180 days. The New Hampshire Public Utilities Commission has set
May 1 as the expected date for the issuance of its order in this matter.

   Public Utility Holding Company Act of 1935. As a result of the merger,
KeySpan will hold all of Eastern's Common Stock. Under the Public Utility
Holding Company Act of 1935, KeySpan must obtain the approval of the SEC before
acquiring the Eastern Common Stock and consummation of the merger is
conditioned upon the receipt of SEC approvals. On March 6, 2000, KeySpan and
ACJ Acquisition filed with the SEC an application requesting SEC approval to
acquire the Eastern Common Stock. KeySpan will file additional applications
with the SEC with respect to the SEC approvals required to consummate the
merger.

   KeySpan is currently and will continue to be a "holding company" as defined
in the Public Utility Holding Company Act of 1935, but is currently exempt from
registration as a "holding company" and from most regulation under the Public
Utility Holding Company Act of 1935 because, among other requirements for such
exemption, KeySpan and its material utility subsidiaries are "predominantly
intrastate in character". As a result of the acquisition of Eastern's Common
Stock, KeySpan will likely no longer qualify for an exemption from
registration, and KeySpan intends to register as a holding company under the
Public Utility Holding Company Act of 1935.

   Antitrust Considerations. Under the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, and the rules, and regulations adopted under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, the merger may not be consummated until the
requisite notifications and report forms have been filed with the Antitrust
Division of the United States Department of Justice and the Federal Trade
Commission and the specified Hart-Scott-Rodino Antitrust Improvements Act of
1976 waiting period requirements have been satisfied. The Hart-Scott-Rodino
Antitrust Improvements Act of 1976 waiting period is thirty days from the date
both parties have filed their notification and report form unless terminated
earlier or unless extended by the Federal Trade Commission or the Department of
Justice issuing a request for additional information or documentary materials.
Thereafter, the waiting period may be extended only by court order or with the
parties' consent. The expiration or earlier termination of the Hart-Scott-
Rodino Antitrust Improvements Act of 1976 waiting period does not preclude the
Department of Justice or the Federal Trade Commission from challenging the
merger on antitrust grounds either before or after consummation of the merger.
Private parties and state attorneys general may also bring legal action under
federal or state antitrust laws under certain circumstances.

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<PAGE>

   If the merger is not consummated within twelve months after the expiration
or earlier termination of the Hart-Scott-Rodino Antitrust Improvements Act of
1976 waiting period, Eastern and KeySpan would be required to submit new
filings to the Department of Justice and the Federal Trade Commission, and a
new Hart-Scott-Rodino Antitrust Improvements Act of 1976 waiting period would
have to expire or be earlier terminated before the merger could be consummated.
Eastern and KeySpan intend to file their pre-merger notification and report
forms pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 at
such time as they believe there is a high degree of certainty that the merger
will be consummated within twelve months after the expiration or earlier
termination of the waiting period under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976. The Federal Trade Commission and the Department of
Justice frequently scrutinize the legality under the antitrust laws of
transactions such as the proposed transaction. Neither Eastern nor KeySpan
believes that the merger will violate federal antitrust laws. Nevertheless,
there can be no assurance that a challenge to the proposed transaction will not
be made on antitrust grounds or, if such a challenge is made, what the result
would be.

   General. Under the merger agreement, Eastern and KeySpan have agreed to use
their reasonable best efforts to take or cause to be taken all actions and to
do, or cause to be done, all things necessary under applicable laws and
regulations to consummate and make effective the merger and the other
transactions contemplated by the merger agreement. Various parties may seek
intervention in the proceedings associated with the regulatory approval process
in an attempt to oppose the merger or to have conditions imposed upon the
receipt of the necessary approvals. Although KeySpan and Eastern believe that
they will receive the requisite regulatory approvals for the merger, the timing
of their receipt cannot be determined. It is a condition to the consummation of
the merger that final orders approving the merger be obtained from the various
federal and state commissions described above.

Delisting and Deregistration of Common Stock

   If the merger is completed, the Common Stock will no longer be listed on the
New York, Pacific and Boston Stock Exchanges and will be deregistered under the
Exchange Act.

                  APPRAISAL RIGHTS OF DISSENTING SHAREHOLDERS

   Pursuant to the terms of Eastern's Declaration of Trust, you are entitled to
appraisal rights under Sections 85 through 98 of Chapter156B of the General
Laws of Massachusetts ("MGL"). Sections 85 through 98 of the MGL are reprinted
in their entirety as Appendix C to this proxy statement. All references in
Sections 85 through 98 of the MGL and in this summary to a "shareholder" are to
the record holder or beneficial owner of shares of Eastern Common Stock as to
which appraisal rights are asserted. If you have a beneficial interest in
shares of Eastern Common Stock that are held of record in the name of another
person, such as a broker or nominee, you must act promptly to cause the record
holder to properly follow the steps summarized below in a timely manner to
perfect whatever appraisal rights you may have.

   The following discussion merely summarizes the law relating to appraisal
rights; it is qualified in its entirety by reference to Appendix C. If you wish
to exercise statutory appraisal rights or preserve your right to do so, you
should review this discussion and Appendix C carefully to comply strictly with
the procedures described or you may lose your appraisal rights.

   To claim appraisal rights, first you must file a written objection to the
merger prior to the Annual Meeting, stating that you intend to demand payment
for your shares of Eastern Common Stock if the merger is consummated, and
second you must not vote your shares in favor of approval of the merger (i.e.
not vote at all or vote against the merger). If you identify yourself as a
dissenting shareholder by doing the aforementioned, you will receive
correspondence from Eastern by registered or certified mail notifying you of
the merger's effectiveness within 10 days of its approval by the shareholders
and its consummation. You must then demand, in writing, payment for and an
appraisal of the value of shares of Common Stock from Eastern within 20 days

                                       39
<PAGE>

after you receive this correspondence from Eastern. You are advised that a vote
against the merger will not satisfy the requirement that a written objection be
filed with Eastern prior to the taking of the shareholder vote on the merger.

   Eastern is required to make payment of the fair market value of the shares
of Common Stock owned by each dissenting shareholder within 30 days after the
expiration of the 20-day period during which a demand of payment for shares may
be made. But, if, during this 30-day period, Eastern and a dissenting
shareholder disagree as to the fair value of such dissenting shareholder's
shares, either Eastern or you, as a dissenting shareholder, may, within four
months after the expiration of this 30-day period, request a court
determination of the fair value of these shares by filing a bill in equity in
the Superior Court of Middlesex County in the Commonwealth of Massachusetts.
The cost of this action, other than counsel fees and fees of experts retained
by a party, will be determined by the court and apportioned equitably by the
court. All costs of giving notice to eligible dissenting shareholders will be
paid by Eastern. The "fair value" of the Eastern Common Stock held by you will
be determined as of the day preceding the date that the merger was approved by
the shareholders, and will not include any element of value arising from the
merger. After the court enters a decree determining the fair value, dissenting
shareholders will transfer their stock certificates to Eastern and will receive
payment, as ordered, from Eastern.

   If you wish to exercise the statutory appraisal rights summarized above, you
should consult with counsel. You may lose your appraisal rights if you fail to
follow precisely all of the steps required by Sections 85 through 98 of the
MGL. Under Section 98 of the MGL, the enforcement by a dissenting shareholder
of the right to receive payment for his or her or its shares of common stock is
generally an exclusive remedy. As a dissenting shareholder, however, you retain
the right to bring a proceeding to obtain relief on the ground that the merger
is illegal or fraudulent to you.

                             HISTORICAL INFORMATION

   On November 3, 1999, the last trading day prior to announcement of the
execution of the merger agreement, the high sales price per share of Eastern
Common Stock as reported on the New York Stock Exchange was $52.5625 and the
low sales price per share as reported on the New York Stock Exchange was
$50.8125. Eastern urges you to obtain current market quotations before making
any decision with respect to the merger.

   In the past, Eastern has regularly paid cash dividends on its Common Stock.
Under the merger agreement, Eastern may continue to pay quarterly dividends on
Eastern Common Stock prior to the closing of the merger which do not exceed the
current regular dividends; however, Eastern may increase its dividends by up to
$0.04 per year if the merger has not closed by November 4, 2000.

                                       40
<PAGE>

                           HISTORICAL PER SHARE DATA

   The following tables set forth certain unaudited historical per share data
of Eastern and the combined per share data on an unaudited pro forma basis
after giving effect to Eastern's acquisition of Colonial Gas using the purchase
method of accounting for business combinations. This data should be read in
conjunction with the selected financial data and the combined unaudited pro
forma financial statements included elsewhere in this proxy statement and the
separate historical financial statements of Eastern incorporated by reference
herein. The pro forma combined financial data are not necessarily indicative of
the operating results or financial position that would have been achieved if
the merger had been effective as of the beginning of the periods presented, nor
are they necessarily indicative of the future operating results or financial
position of Eastern or Colonial Gas. Pro forma information reflecting the
completion of the pending Eastern-EnergyNorth merger has not been presented
herein as this transaction is not considered material.

<TABLE>
<CAPTION>
                                           Fiscal Year Ended Fiscal Year Ended
                                           December 31, 1998 December 31, 1999
                                           ----------------- -----------------
<S>                                        <C>               <C>
Eastern--Historical
Earnings per common share before
 extraordinary items:
  Basic...................................      $ 2.26            $ 2.28
  Diluted.................................        2.24              2.27
Cash dividends declared per share.........        1.65              1.69
Book value per share at period end........       24.24             27.83

<CAPTION>
                                           Fiscal Year Ended Fiscal Year Ended
                                           December 31, 1998 December 31, 1999
                                           ----------------- -----------------
<S>                                        <C>               <C>
Eastern/Colonial Gas--Pro Forma
 Combined(a)(b)
Earnings per common share before
 extraordinary items:
  Basic...................................      $ 2.06            $ 2.11
  Diluted.................................        2.04              2.10
Cash dividends declared per share.........        1.65              1.69
Book value per share at period end(c).....       27.36             27.83
</TABLE>
- --------
(a) Pro forma combined cash dividends declared per share represents the
    historical dividends of Eastern for all Eastern's current cash dividends
    declared per share is $0.43 per common share per quarter after giving
    effect to the number of shares outstanding after Eastern's acquisition of
    Colonial Gas, assuming an exchange ratio of .852, the pro forma payout
    ratio of the combined company is approximately 83%. Additionally, the
    equivalent cash dividend per share of Colonial Gas common stock based upon
    Eastern's current annual dividend policy is $1.44.

(b) Pro forma information reflecting the completion of the pending Eastern-
    EnergyNorth merger has not been presented herein as this transaction is not
    considered material.

(c) The book value per share information as of December 31, 1998 is calculated
    based on the Eastern balance sheet as of December 31, 1998 combined with
    the Colonial Gas balance sheet as of December 31, 1998 (assuming Eastern's
    merger with Colonial Gas had been effective as of December 31, 1998). The
    book value per share information as of December 31, 1999 is calculated
    based on the Eastern balance sheet as of December 31, 1999 (which reflects
    Eastern's acquisition of Colonial Gas).

                                       41
<PAGE>

                    COMPARATIVE DIVIDENDS AND MARKET PRICES

Eastern

   Eastern common stock is listed and principally traded on the New York Stock
Exchange, the Boston Stock Exchange and the Pacific Stock Exchange under the
symbol "EFU". The table below sets forth the dividends declared and the high
and low sales prices of Eastern common stock for the fiscal periods indicated
as reported in The Wall Street Journal as New York Stock Exchange Composite
Transactions.

   On March 7, 2000, the closing price of Eastern common stock was $57.8125.

<TABLE>
<CAPTION>
                                                                  Price Range
                                                     Dividends -----------------
                                                     Declared    High     Low
                                                     --------- -------- --------
<S>                                                  <C>       <C>      <C>
Year Ended December 31, 1997
  First Quarter.....................................      $.40 $36.375  $30.500
  Second Quarter....................................       .40  35.875   30.500
  Third Quarter.....................................       .40  38.188   34.750
  Fourth Quarter....................................       .41  45.375   36.750
Year Ended December 31, 1998
  First Quarter.....................................      $.41 $45.625  $40.375
  Second Quarter....................................       .41  44.750   37.625
  Third Quarter.....................................       .41  43.500   38.250
  Fourth Quarter....................................       .42  44.250   40.000
Year Ended December 31, 1999
  First Quarter.....................................      $.42 $44.000  $36.375
  Second Quarter....................................       .42  40.5625  33.500
  Third Quarter.....................................       .42  47.375   38.0625
  Fourth Quarter....................................       .43  57.4375  46.000
Year Ended December 31, 2000
  First Quarter (through March 7, 2000).............      $.43 $58.625  $56.25
</TABLE>

                                       42
<PAGE>

           EASTERN COMBINED UNAUDITED PRO FORMA FINANCIAL INFORMATION

   Eastern completed its acquisition of Colonial Gas Company on August 31, 1999
and is accounting for this transaction under the purchase method of accounting
for business combinations.

   The Eastern combined unaudited adjusted pro forma statements of operations
for the years ended December 31, 1999 and December 31, 1998 include the effect
of this acquisition, as if such acquisition had occurred on January 1, 1998.

   The Eastern combined unaudited adjusted pro forma financial information is
not necessarily indicative of the results of operations which would have been
reported if the Colonial Gas acquisition had occurred on the indicated dates
nor is it necessarily indicative of the future operating results of the
combined company. Furthermore, the adjusted historical financial information
does not give effect to the efficiencies that may be obtained by combining the
operations of Eastern and Colonial Gas and the costs incurred for
restructuring, integrating and consolidating the operations of Eastern and
Colonial Gas preliminarily estimated at $5.0 million (net of tax of $3.4
million) which will be charged to income as incurred. In the opinion of
management, all adjustments necessary to present fairly such adjusted
historical statement of operations have been made.

   The Eastern combined unaudited pro forma information should be read in
conjunction with the historical consolidated financial statements of Eastern
which are incorporated by reference into this proxy statement and the
historical consolidated financial statements of Colonial Gas.

   Pro forma information reflecting the completion of the pending Eastern-
EnergyNorth merger has not been presented herein as this transaction is not
considered material.

                                       43
<PAGE>

          EASTERN COMBINED UNAUDITED PRO FORMA STATEMENT OF OPERATIONS

                          Year Ended December 31, 1999
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                             Eastern           Colonial        Pro Forma     Pro Forma
                          As Reported(2) (As Reclassified)(2) Adjustments   Balances(1)
                          -------------- -------------------- -----------   -----------
<S>                       <C>            <C>                  <C>           <C>
Revenues................     $921,460          $187,517         $   --      $1,108,977
Operating costs and
 expenses:
  Operating costs.......      631,660           120,371                        744,007
  Selling, general and
   administrative
   expenses.............      113,654            23,435          (8,024)(4)    137,089
  Depreciation and
   amortization.........       74,608            17,644           2,580 (3)     94,832
                             --------          --------         -------     ----------
Operating earnings......      101,538            26,067           5,444        133,049
Other income (expense):
  Interest income.......        7,962               --           (5,945)(5)      2,017
  Interest expense......      (35,528)          (10,348)            --         (45,876)
  Other, net............        8,587               583             --           9,170
                             --------          --------         -------     ----------
Earnings from continuing
 operations before
 income taxes...........       82,559            16,302            (501)        98,360
Provision for income
 taxes..................       32,352             7,766           1,321 (6)     41,439
                             --------          --------         -------     ----------
Net earnings from
 continuing operations
 before extraordinary
 items..................     $ 50,207          $  8,536         $(1,822)    $   56,921
                             ========          ========         =======     ==========
Basic earnings per share
 from continuing
 operations(4):.........     $   2.21                                       $     2.11
                             ========                                       ==========
Diluted earnings per
 share from continuing
 operations(4):.........     $   2.20                                       $     2.10
                             ========                                       ==========
Weighted average number
 of common
 shares outstanding:
  Basic.................       22,701                                           26,920
                             ========                                       ==========
  Diluted...............       22,844                                           27,063
                             ========                                       ==========
</TABLE>

    See accompanying notes to Eastern Combined Unaudited Pro Forma Financial
                                  Information.

                                       44
<PAGE>

          EASTERN COMBINED UNAUDITED PRO FORMA STATEMENT OF OPERATIONS

                          Year Ended December 31, 1998
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                              Eastern            Colonial        Pro Forma     Pro Forma
                          (As Reported)(2) (As Reclassified)(2) Adjustments   Balances(1)
                          ---------------- -------------------- -----------   -----------
<S>                       <C>              <C>                  <C>           <C>
Revenues................      $935,264           $183,093         $   --      $1,118,357
Operating costs and
 expenses:
  Operating costs.......       640,792            111,705                        752,497
  Selling, general and
   administrative
   expenses.............       118,546             28,795          (3,681)(4)    143,660
  Depreciation and
   amortization.........        75,521             14,727           3,870 (3)     94,118
                              --------           --------         -------     ----------
Operating earnings......       100,405             27,866            (189)       128,082
Other income (expense):
  Interest income.......         7,582              2,360          (8,918)(5)      1,024
  Interest expense......       (33,584)           (10,861)                       (44,445)
  Other, net............         5,591                847                          6,438
                              --------           --------         -------     ----------
Earnings from continuing
 operations before
 income taxes...........        79,994             20,212          (9,107)        91,099
Provision for income
 taxes..................        29,166              7,910            (894)(6)     36,182
                              --------           --------         -------     ----------
Net earnings from
 continuing operations
 before extraordinary
 items..................      $ 50,828           $ 12,302         $(8,213)    $   54,917
                              ========           ========         =======     ==========
Basic earnings per share
 from continuing
 operations before
 extraordinary
 items(4):..............      $   2.26           $   1.40                     $     2.06
                              ========           ========                     ==========
Diluted earnings per
 share from continuing
 operations before
 extraordinary
 items(4):..............      $   2.24           $   1.40                     $     2.04
                              ========           ========                     ==========
Weighted average number
 of common
 shares outstanding:
  Basic.................        22,474              8,781                         26,693
                              ========           ========                     ==========
  Diluted...............        22,680              8,781                         26,899
                              ========           ========                     ==========
</TABLE>

    See accompanying notes to Eastern Combined Unaudited Pro Forma Financial
                                  Information.

                                       45
<PAGE>

      NOTES TO EASTERN COMBINED UNAUDITED PRO FORMA FINANCIAL INFORMATION

(1) The Colonial Gas Company Acquisition

   The Colonial Gas Company acquisition was accounted for under the purchase
method of accounting for business combinations. The adjusted historical
financial information does not give effect to (a) the efficiencies that may be
obtained by combining the operations of Eastern and Colonial Gas, (b) the costs
incurred for restructuring, integrating and consolidating the operations of
Eastern and Colonial Gas preliminarily estimated at $8.4 million ($5.0 million
net of tax) which will be charged to income as incurred.

   On September 30, 1998, Eastern completed a merger with Essex Gas Company
which was accounted for as a pooling-of-interests. Accordingly, the
accompanying unaudited pro forma combined financial data include in Eastern the
accounts of Essex Gas for all periods presented.

   Pro forma information reflecting the completion of the pending Eastern-
EnergyNorth merger has not been presented herein as this transaction is not
considered material.

(2) Reclassifications

   These columns represent historical results of operations and financial
position of the respective companies. Certain reclassifications have been made
to the historical balance sheet and statements of operations of Colonial Gas to
conform with Eastern's historical financial statement presentation.

(3) Depreciation and Amortization

(a)  A pro forma adjustment has been made for the twelve months ended December
     31, 1999 and the twelve months ended December 31, 1998 to reflect
     incremental amortization expense on the goodwill created by the Colonial
     Gas acquisition. Goodwill is principally amortized over a 40-year life.

(b)  A pro forma adjustment has been made to reverse previously expensed
     depreciation for the twelve months ended December 31, 1999 and the twelve
     months ended December 31, 1998. These depreciation charges relate to
     assets not given value in purchase accounting on the date of the Colonial
     Gas acquisition.

(4) Selling, General and Administrative Expenses

(a)  A pro forma adjustment has been made to reverse previously expensed
     transaction costs for the twelve months ended December 31, 1999 and the
     twelve months ended December 31, 1998. These costs are non-recurring and
     relate directly to the Colonial Gas acquisition.

(b)  A pro forma adjustment has been made for the twelve months ended December
     31, 1999 and the twelve months ended December 31, 1998 to reflect
     recurring recoveries and expenses previously recorded through regulatory
     assets which were not given value as a direct result of the Colonial Gas
     acquisition.

(5) Interest Income

   A pro forma adjustment has been made to reflect reduced interest income
resulting from the use of cash more fully described in 5(a) above as if such
funding had occurred on January 1, 1998, assuming a weighted average annual
interest rate of 5.5%.

(6) Income Taxes

   A pro forma adjustment has been made for the twelve months ended December
31, 1999 and the twelve months ended December 31, 1998 to reflect the tax
effect of the pro forma adjustments using Eastern's incremental tax rate of
35%. Goodwill created by the Colonial Gas acquisition is nondeductible for tax
purposes because the transaction is tax-free.

                                       46
<PAGE>

III. PROPOSAL 3: ELECTION OF TRUSTEES

   The Board recommends that you vote "FOR" the individuals nominated as
Trustees in this proposal.

   The Board is divided into three classes having staggered terms of three
years each. The Declaration of Trust of Eastern provides that the number of
Trustees shall be fixed from time to time by the Trustees but shall not be less
than three or more than twenty. The total number of Trustees to serve following
the 2000 Annual Meeting is currently fixed at ten. Four of the Trustees now in
office have terms expiring at the 2002 Annual Meeting, three have terms
expiring at the 2001 Annual Meeting and three have terms expiring at the 2000
Annual Meeting. The three Trustees now in office having terms expiring at the
2000 Annual Meeting have been nominated by the Board for re-election at such
meeting. Each Trustee elected at the 2000 Annual Meeting will be elected to
hold office until the 2003 Annual Meeting, or until such Trustee's successor is
elected and qualified.

                     INFORMATION WITH RESPECT TO THE BOARD

   The Board, which held 13 regularly scheduled meetings and took action two
times by written consent in 1999, maintains a standing Audit Committee,
Compensation Committee and Nominating Committee, each of which is comprised of
Trustees who are not officers or employees of Eastern or any of its
subsidiaries. The Board also maintains an Executive Committee which has
substantially all of the powers and discretion of the full Board and is
available to act when the Board is not in session. The Executive Committee took
no action in 1999. Membership on the various committees is indicated in the
biographical information which follows.

   It is Eastern's policy that a majority of the members of the Board be
independent, non-management Trustees.

   The Audit Committee, which met five times in 1999, is responsible for
reviewing the performance and recommending the engagement of Eastern's
independent auditors, reviewing the scope of the audit and approving all fees
paid to such auditors. The Audit Committee also reviews the adequacy of the
Eastern's audit and accounting procedures, internal controls, financial
reporting practices and annual and quarterly reports, and meets with, and
reviews the audit plans of, Eastern's internal audit department.

   The Compensation Committee, which met five times and took action one time by
written consent in 1999, is responsible for approving officer compensation
arrangements, recommending Trustee compensation arrangements, administering
stock option and other compensation and benefit plans, and reviewing major
personnel policies and benefit programs of Eastern and its subsidiaries.

   The Nominating Committee, which met two times in 1999, is responsible for
nominating Trustees, members of committees of the Board and officers of
Eastern, reviewing management development and succession programs, and
reviewing and making recommendations concerning Eastern's corporate governance
policies. It will consider nominees for the Board recommended by shareholders
of Eastern. Written recommendations together with supporting information should
be directed to Eastern Enterprises, Attn: The Nominating Committee, 9 Riverside
Road, Weston, Massachusetts 02493. Nominations for the election of Trustees at
an annual meeting may be made by a shareholder only if written notice of such
shareholder's intent to make such nomination has been given to the Secretary
not later than forty-five days prior to the anniversary of the date of the
immediately preceding annual meeting. Such notice shall set forth the
information required by Article 6 of Eastern's Declaration of Trust.

   During 1999, each Trustee attended at least 75% of the aggregate of meetings
of the Board and each committee on which he or she served.

   Eastern's by-laws provide that no one may be elected to serve as a Trustee
after reaching age 68, unless that person resigns at the first annual
shareholder meeting after reaching age 70. This policy, however, may be waived
by a majority of the Trustees then in office. On February 25, 1998 and February
23, 2000, a majority of the Trustees voted to waive this policy as it applied
to Mr. Stone.

                                       47
<PAGE>

               INFORMATION WITH RESPECT TO NOMINEES AND TRUSTEES

   It is the intention of the management proxies to vote for the election of
the three nominees listed below. The management proxies will distribute the
total number of votes to which the shareholder executing the proxy is entitled
among the three nominees in such manner as such proxies in their discretion
shall determine unless other instructions are given in the proxy by the
shareholder executing it. If any nominee is not available as a candidate when
the election occurs, discretionary authority is reserved to vote for a
substitute. Management has no reason to believe that any nominee will not be
available.

   The nominees for terms of office expiring at the 2003 Annual Meeting are as
follows:


                RICHARD R. CLAYTON, former President and Chief Operating
                Officer of Eastern. Mr. Clayton is 61 years old and is a
                graduate of Purdue University. Mr. Clayton served as President
                and Chief Operating Officer of Eastern from 1991 to 1998.
                Prior to joining Eastern in 1987 as its Executive Vice
                President and Chief Administrative Officer, Mr. Clayton was
                Chairman and Chief Executive Officer of Vermont Castings, Inc.

[Picture]                                                     Trustee since 1993


                LEONARD R. JASKOL, former Chairman and Chief Executive Officer
                of Lydall, Inc., a manufacturing company. Mr. Jaskol is 63
                years old and is a graduate of American University and City
                University of New York Graduate School of Business. Mr. Jaskol
                was an executive for 25 years at, and from 1988 to 1998 Mr.
                Jaskol served as Chairman and Chief Executive Officer of,
                Lydall, Inc. He is a Director of Rogers, Corp. and a Trustee
                of American University.


[Picture]

                                                             Trustee since 1994;
                                                  member, Compensation Committee


                DAVID B. STONE, Chairman of North American Management Corp.,
                an investment management firm. Mr. Stone is 72 years old and
                is a graduate of Harvard University and Harvard Business
                School. Mr. Stone serves as Chairman and Trustee of Memorial
                Drive Trust; a Director or Trustee of several mutual funds
                advised by Massachusetts Financial Services Company; a
                Director of Boston Municipal Research Bureau; President of
                Stonetex Oil Corp.; and a Trustee of the New England Aquarium.

[Picture]

                                                             Trustee since 1995;
                         Chairman, Audit Committee; member, Nominating Committee

   The members of the Board of Trustees having terms of office expiring at the
2002 Annual Meeting of Shareholders are as follows:


                JOHN D. CURTIN, JR., Investor. Mr. Curtin is 67 years old and
                is a graduate of Yale College and Harvard Business School.
                From 1995 to 1998 Mr. Curtin served as Chairman and Chief
                Executive Officer of Aearo Corporation, a manufacturing
                company. From 1989 to 1995 he was Executive Vice President,
                from 1992 to 1995 he was a Director, and from 1989 to 1992 he
                was Chief Financial Officer, of Cabot Corporation, a global
                specialty chemicals, materials and energy company. Mr. Curtin
                is a Director of Aearo Corporation, Imperial Sugar Company and
                Pioneer Group, Inc.

[Picture]

                                                             Trustee since 1997;
                            member, Audit, Compensation and Executive Committees

                                       48
<PAGE>



                WENDELL J. KNOX, President and Chief Executive Officer of Abt
                Associates Inc., a global research and consulting firm. Mr.
                Knox is 52 years old and is a graduate of Harvard University.
                Mr. Knox is a Trustee of Brigham and Women's Hospital, the
                Greater Boston Chamber of Commerce and The Biomedical Sciences
                Career Project. Mr. Knox also serves as Chairman of the Board
                of Directors of The Partnership, Inc. and as a Director of
                United Way of Massachusetts Bay, Eastern Bank and Allmerica
                Financial Corporation, and serves on the Advisory Board to
                Commonwealth Capital Ventures.

[Picture]

                                                             Trustee since 1997;
                                                         member, Audit Committee


                FREDERIC L. PUTNAM, JR., former Chairman of the Board of
                Directors and Senior Executive Officer of Colonial Gas
                Company, a utility. Mr. Putnam is 75 years old and is a
                graduate of Harvard College and Harvard Law School. Mr. Putnam
                served Colonial Gas Company as Chairman of the Board of
                Directors from 1981, and Senior Executive Officer from
                February 1995, to August 1999. He also served as Chief
                Executive Officer of Colonial Gas Company from April 1984 to
                February 1995.

[Picture]                           Elected to Board of Trustees, September 1999



                RINA K. SPENCE, President of SpenceCare International LLC, a
                health care consulting company, and President and Chief
                Executive Officer of iemily.com, an internet company. Ms.
                Spence is 51 years old and is a graduate of Boston University
                and Harvard University, Kennedy School of Government. Ms.
                Spence has served as President of SpenceCare International LLC
                since 1998 and was acting President and Chief Executive
                Officer of Consensus Pharmaceuticals, Inc., a
                biopharmaceutical company, from 1998 to 1999. From 1994 to
                1998 Ms. Spence served as President and Chief Executive
                Officer of RKS Health Ventures Corporation and Spence Centers
                for Women's Health, women's health services companies. From
                1984 to 1994 Ms.Spence was President and Chief Executive
                Officer of Emerson Health System, Inc. and Emerson Hospital.
                Ms. Spence is a Trustee of the Wang Center for the Performing
                Arts, Boston and the Massachusetts Health and Education
                Facilities Authority and a Director of United Way of
                Massachusetts Bay. She is a Director of Berkshire Mutual Life
                Insurance Co. and Trustee of the State Street Master Trust.


[Picture]

                                                             Trustee since 1989;
               Chairperson, Compensation Committee; member, Nominating Committee

   The members of the Board of Trustees having terms of office expiring at the
2001 Annual Meeting of Shareholders are as follows:


                JAMES R. BARKER, Chairman and President of Interlake Steamship
                Company, Vice Chairman of Mormac Marine Group, Inc. and Moran
                Towing Company, marine transportation companies. Mr. Barker is
                also a principal owner and Director of Meridian Aggregates
                Company. Mr. Barker is 64 years old and is a graduate of
                Columbia University and Harvard Business School. He was
                formerly Chairman and Chief Executive Officer of Moore
                McCormack Resources, Inc. Mr. Barker co-founded Temple, Barker
                & Sloane, Inc., a management consulting firm. He is a Director
                of GTE Corporation and The Pittston Company; and a member of
                the Board of Trustees of Stamford (Connecticut) Hospital.


                                                             Trustee since 1995;
                                                  member, Compensation Committee

                                       49
<PAGE>



                SAMUEL FRANKENHEIM, Counsel, Ropes & Gray. Mr. Frankenheim is
                67 years old and is a graduate of Cornell University and
                Cornell University Law School. Prior to joining Ropes & Gray
                in 1992, Mr. Frankenheim was Senior Vice President, General
                Counsel, Secretary and a member of the Office of the Chairman
                of General Cinema Corporation (now Harcourt General, Inc.) and
                of The Neiman Marcus Group, Inc. He is a Trustee of the
                Huntington Theatre Company, Boston; a Director (and formerly
                Chairman of the Board) of the International Alliance of First
                Night Celebrations; Member of the Corporation of Partners
                Healthcare System; and an Honorary Trustee of Newton-Wellesley
                Hospital.

[Picture]

                                                             Trustee since 1993;
          Chairman, Nominating Committee; member, Audit and Executive Committees


                J. ATWOOD IVES, Chairman and Chief Executive Officer of
                Eastern. Mr. Ives is 63 years old, is a graduate of Yale
                College and Stanford University Graduate School of Business,
                and is a certified public accountant. Prior to joining Eastern
                as Chairman and Chief Executive Officer in 1991, he was Vice
                Chairman, Chief Financial Officer and a member of the Office
                of the Chairman of General Cinema Corporation (now Harcourt
                General, Inc.) and of The Neiman Marcus Group, Inc. He is a
                Director or Trustee of several mutual funds advised by
                Massachusetts Financial Services Company; a Trustee of the
                Museum of Fine Arts, Boston; a Director of United Way of
                Massachusetts Bay and the Massachusetts Business Roundtable;
                and a member of the Corporate Advisory Board of the Stanford
                University Graduate School of Business and the Boston College
                Carroll School of Management.

[Picture]

                                                             Trustee since 1989;
                                                   Chairman, Executive Committee

                                       50
<PAGE>

               STOCK OWNERSHIP OF TRUSTEES AND EXECUTIVE OFFICERS

   The following information is furnished as to the Common Stock of Eastern
owned beneficially (as defined by Rule 13d-3 under the Exchange Act) as of
February 28, 2000 by each Trustee and nominee, each executive officer named in
the Summary Compensation Table on page 51, and the Trustees and executive
officers of Eastern as a group. The information concerning beneficial ownership
has been furnished by the persons listed below.

<TABLE>
<CAPTION>
                             Amount and
                               Nature
                                 of                                   Percent
                             Beneficial                                  of
Name                        Ownership(a)                              Class(a)
- ----                        ------------                              --------
<S>                         <C>                                   <C> <C>
J. R. Barker...............     5,450(c)(d)                               *
R. R. Clayton..............    77,281(d)(e)                             0.3%
J. M. Cook.................     7,448(f)(g)                               *
J. D. Curtin, Jr...........     4,900(c)(d)                               *
W. J. Flaherty.............    58,680(f)                                0.2
S. Frankenheim.............     1,558(c)(d)                               *
J. A. Ives.................   378,895(e)(f)                             1.4
L. R. Jaskol...............     5,450(c)(d)                               *
W. J. Knox.................     2,900(c)(d)(h)                            *
L. W. Law, Jr..............    41,466(f)                                0.2
C. R. Messer...............    44,666(e)(f)                             0.2
F. L. Putnam, Jr.
  Individually.............    26,505(i)                                0.1
  By Corporation...........   124,935(j)                                0.5
F. C. Raskin...............    64,457(f)                                0.2
R. K. Spence...............     4,750(c)(d)                               *
D. B. Stone................     4,850(b)(c)(d)                            *
Trustees and Executive
 Officers as a Group (15
 persons)..................   854,190(b)(c)(d)(e)(f)(g)(h)(i)(j)        3.1
</TABLE>
- --------
*  Less than 0.1%.
(a)  Except as noted, each Trustee, nominee and executive officer has sole or
     shared voting and investment power over the shares owned.
(b)  Figure for Mr. Stone includes 400 shares awarded under Restricted Stock
     Plan for Non-Employee Trustees; and figure for Trustees and executive
     officers as a group includes such 400 shares.
(c)  Figures do not include the following Share Units held under the Deferred
     Compensation Plan for Trustees: Mr. Barker, 2,040; Mr. Curtin, 3,750; Mr.
     Frankenheim, 10,981; Mr. Jaskol, 5,783; Mr. Knox, 2,700; Ms. Spence,
     3,240; Mr. Stone, 3,792; and 32,287 as a group.
(d)  Figures include, as of April 27, 2000, 4,450 shares which may be acquired
     through the exercise of stock options for each of Messrs. Barker, Jaskol
     and Stone and Ms. Spence, 3,900 shares which may be acquired through the
     exercise of stock options by Mr. Curtin, 1,500 shares which may be
     acquired through the exercise of stock options by Mr. Frankenheim, 2,800
     shares which may be acquired through the exercise of stock options by Mr.
     Knox and 27,700 shares which may be acquired through the exercise of stock
     options by Mr. Clayton.
(e)  Figures include the following shares owned by spouse or held by spouse as
     custodian or trustee for children: Mr. Ives, 13,000, Mr. Messer, 7,400 and
     Mr. Clayton 45,383.
(f)  Figures include the following shares which executive officers have the
     right to acquire as of April 27, 2000 through the exercise of employee
     stock options: Mr. Ives, 154,034; Mr. Raskin, 26,800; Mr. Messer, 7,700;
     Mr. Flaherty, 25,800; Mr. Law, 22,700; Mr. Cook, 4,000; and Trustees and
     executive officers as a group, 294,734.
(g)  Figure includes 3,000 shares awarded under Eastern's 1991 Restricted Stock
     Plan, of which 600 have vested.
(h)  Figure includes 100 shares owned jointly with spouse.
(i)  Consisting of 2,241 shares owned solely; 3,482 shares owned jointly with
     spouse; 1,049 shares owned of record by spouse over which Mr. Putnam has
     or shares the power to direct disposition or voting; and 19,733 shares
     held in trust for Mr. Putnam under a 401(k) plan pursuant to which he has
     the power to direct the disposition and voting of such shares.
(j)  These shares are held by F. L. Putnam Securities Company, Inc. of which
     Mr. Putnam is a director and owner (as trustee without beneficial
     interest) of approximately 16% of the voting stock. Brothers of Mr. Putnam
     are the other directors and stockholders of that corporation. Mr. Putnam
     disclaims beneficial ownership of these shares.

                                       51
<PAGE>

                       COMPENSATION OF EXECUTIVE OFFICERS

   The following table sets forth certain information concerning the
compensation of Eastern's chief executive officer and its five most highly
compensated other executive officers (the "Named Executive Officers") with
respect to Eastern's last three completed fiscal years:

                           Summary Compensation Table

<TABLE>
<CAPTION>
                                                      Long Term
                                                     Compensation
                                        Annual          Awards
                                     Compensation     Securities
                                  ------------------ ------------
                                                      Underlying   All Other
                                   Salary   Bonus(a) Options/SARs Compensation
Name and Principal Position  Year    ($)      ($)        (#)          ($)
- ---------------------------  ---- --------- -------- ------------ ------------
<S>                          <C>  <C>       <C>      <C>          <C>
J. Atwood Ives.............. 1999 $ 771,018 $463,200    15,000      $ 30,753(b)
 Chairman and                1998   749,603  204,792    19,000        28,057
 Chief Executive Officer     1997   720,627   98,377    20,000        17,976

Fred C. Raskin(c)........... 1999 $ 435,054 $265,740    15,000       $ 2,179(d)
 President and               1998   356,767   42,390    32,000         2,167
 Chief Operating Officer     1997   308,309   34,796     7,500         2,055

Chester R. Messer........... 1999 $ 350,654 $169,506    10,000      $  6,302(b)
 Senior Vice President;
  President of               1998   336,750  138,957     7,000         5,839
 Boston Gas Company,         1997   323,558  160,063     7,500         5,578
 Colonial Gas Company and
 Essex Gas Company

Walter J. Flaherty(e)....... 1999 $ 297,193 $146,960    19,000      $  2,500(d)
 Executive Vice President    1998   276,263   76,865     7,000         2,500
 and Chief Financial Officer 1997   265,619   59,040     7,500         2,375

Jonathan M. Cook(f)......... 1999 $ 325,000 $ 51,025     5,000      $  2,500(d)
 Senior Vice President;      1998    40,625      --     15,000           203
  President of Midland
  Enterprises Inc.

L. William Law, Jr.......... 1999 $ 234,646 $115,321    12,000      $  2,500(d)
 Senior Vice President,      1998   227,654  109,309     5,500         2,500
 General Counsel and
  Secretary                  1997   218,883   50,307     6,000         2,375
</TABLE>
- --------
(a)  Amounts shown represent awards under Eastern's Executive Incentive
     Compensation Plan, which in each case were paid in cash and in shares of
     Eastern's Common Stock. Such amounts were earned in the fiscal year shown
     but paid in the subsequent fiscal year.
(b)  Amounts shown represent employer contributions in the amounts of $2,175
     and $2,400 under Eastern's Retirement Savings 401(k) Plan and $10,162 and
     $3,902 under Eastern's Deferred Compensation Plan for Messrs. Ives and
     Messer, respectively, and $18,416 of insurance premium payments for Mr.
     Ives.
(c)  Mr. Raskin became President and Chief Operating Officer of Eastern
     effective September 1, 1998. Prior to that date he served as Senior Vice
     President of Eastern and President of Midland Enterprises Inc.
(d)  Amounts shown represent employer contributions under Eastern's Retirement
     Savings 401(k) Plan.
(e)  Mr. Flaherty became Executive Vice President and Chief Financial Officer
     of Eastern effective August 9, 1999. Prior to that date, he served as
     Senior Vice President and Chief Financial Officer.
(f)  Mr. Cook became Senior Vice President of Eastern and President of Midland
     Enterprises Inc. effective November 16, 1998.

                                       52
<PAGE>

   The following table sets forth certain information concerning non-qualified
stock options granted to the Named Executive Officers during 1999 under
Eastern's 1995 Stock Option Plan:

                       Option Grants in Last Fiscal Year

                               Individual Grants

<TABLE>
<CAPTION>
                                                                              Potential
                                                                          Realizable Value
                                       % of                               at Assumed Annual
                                       Total                                    Rates
                                      Options                              of Stock Price
                         Number of    Granted                               Appreciation
                         Securities     to     Exercise                      for Option
                         Underlying  Employees  or Base                        Term(a)
                          Options    in Fiscal   Price   Expiration       --------------------
Name                     Granted(#)    Year    ($/share)    Date    0%($)  5%($)       10%($)
- ----                     ----------  --------- --------- ---------- ----- --------    --------
<S>                      <C>         <C>       <C>       <C>        <C>   <C>         <C>
J. Atwood Ives..........   15,000(b)    6.5%    $38.75    2/23/09    $ 0  $365,545(d) $926,363(d)
Fred C. Raskin..........   15,000(c)    6.5     $38.75    2/23/09      0   365,545(d)  926,363(d)
Chester R. Messer.......   10,000(c)    4.3     $38.75    2/23/09      0   243,697(d)  617,575(d)
Walter J. Flaherty......    9,000(c)    3.9     $38.75    2/23/09      0   219,327(d)  555,818(d)
                           10,000(e)    4.3     $38.625    8/6/09      0   242,911(f)  615,583(f)
Jonathan M. Cook........    5,000(c)    2.2     $38.75    2/23/09      0   121,848(d)  308,788(d)
L. William Law, Jr......    7,000(c)    3.0     $38.75    2/23/09      0   170,588(d)  432,303(d)
                            5,000(e)    2.2     $38.625    8/6/09      0   121,455(f)  307,792(f)
</TABLE>
- --------
(a)  The potential realizable values presented in this table use the
     hypothetical rates of appreciation prescribed by regulations of the SEC,
     and are not intended to project rates of future appreciation in the value
     of Eastern's Common Stock.
(b)  Figure represents options granted without SARs. Consists of an option for
     10,000 shares which becomes exercisable at the rate of 33 1/3% on each of
     February 23, 2000, February 23, 2001 and December 1, 2001 and an option
     for 5,000 shares which becomes exercisable at the rate of 50% on each of
     February 23, 2000 and February 23, 2001.
(c)  Figures represent options granted without SARs. Each such option becomes
     exercisable at the rate of 20% per year, commencing February 23, 2000.
(d)  The assumed 5% and 10% annual rates of appreciation would result in prices
     for Eastern's Common Stock increasing to $63.12 and $100.51 per share,
     respectively, by February 23, 2009.
(e)  Figure represents options granted without SARs. Option becomes exercisable
     at the rate of 20% per year, commencing August 6, 2000.
(f)  The assumed 5% and 10% annual rates of appreciation would result in prices
     for Eastern's Common Stock increasing to $62.92 and $100.18 per share,
     respectively, by August 6, 2009.

                                       53
<PAGE>

   The following table sets forth certain information regarding the options
exercised during fiscal year 1999, and the number and value of outstanding
options and SARs in tandem with options held as of December 31, 1999, by Named
Executive Officers under Eastern's Stock Option Plans (no SARs in tandem with
options have been granted since 1991):

                           Year-end Option/SAR Values

<TABLE>
<CAPTION>
                                                        Number of
                                                  Securities Underlying     Value of Unexercised
                           Shares                      Unexercised              In-the-Money
                          Acquired     Value          Options/SARs              Options/SARs
                             on       Realized       At 12/31/99(#)           at 12/31/99($)(b)
Name                     Exercise(#)   ($)(a)   Exercisable/Unexercisable Exercisable/Unexercisable
- ----                     ----------- ---------- ------------------------- -------------------------
<S>                      <C>         <C>        <C>                       <C>
J. Atwood Ives..........   170,000   $3,142,280      134,000/52,000(c)      $3,869,747/$1,001,490
Fred C. Raskin..........    18,100      243,968       17,800/49,900            379,950/928,697
Chester R. Messer.......    24,200      653,130            0/24,300                  0/468,772
Walter J. Flaherty......     8,000      109,875       18,200/33,500            472,367/640,435
Jonathan M. Cook........       --           --         3,000/17,000             49,969/292,220
L. William Law, Jr......     3,200       28,684       16,800/23,400            451,617/448,059
</TABLE>
- --------
(a)  The amount "realized" reflects the appreciation on the date of exercise
     (based on the excess of the fair market value of the shares on the date of
     exercise over the exercise price).
(b)  All values are based on $57.2188, the closing price on December 31, 1999.
(c)  Figures represent options without SARs. No SARs have been granted to J.A.
     Ives.

                                       54
<PAGE>

   The following table sets forth estimated annual benefits payable upon
retirement in specified compensation and years of service categories under
qualified retirement plans maintained for salaried employees of Eastern and
certain subsidiaries (the "Retirement Plans") and Eastern's non-qualified SERP
maintained for all executive officers and certain other officers of Eastern and
its subsidiaries:

                               Pension Plan Table

<TABLE>
<CAPTION>
                              Estimated Annual Retirement Benefit
                                  Based on Years of Service(b)
                    --------------------------------------------------------------------
Remuneration(a)        15             20             25             30             35
- ---------------     --------       --------       --------       --------       --------
<S>                 <C>            <C>            <C>            <C>            <C>
$  100,000          $ 42,500       $ 50,000       $ 50,000       $ 50,000       $ 50,000
   200,000            85,000        100,000        100,000        100,000        100,000
   300,000           127,500        150,000        150,000        150,000        150,000
   400,000           170,000        200,000        200,000        200,000        200,000
   500,000           212,500        250,000        250,000        250,000        250,000
   600,000           255,000        300,000        300,000        300,000        300,000
   700,000           297,500        350,000        350,000        350,000        350,000
   800,000           340,000        400,000        400,000        400,000        400,000
   900,000           382,500        409,000        409,000        409,000        409,000
 1,000,000           409,000        409,000        409,000        409,000        409,000
</TABLE>
- --------
(a)  The compensation covered by the Retirement Plans and the SERP is the
     average annual compensation (whether or not deferred under deferred
     compensation or savings plan) for the highest five years in the ten years
     preceding retirement, based on the annual salary rate plus 100% of bonuses
     and incentive awards earned (whether payable in cash or stock), not
     including any amounts with respect to options, SARs or restricted stock
     awards. Benefits under the SERP vest with regard to any eligible officer
     with a change of control severance agreement who is terminated under
     circumstances entitling him or her to severance in connection with a
     change of control, regardless of age. However, benefits would not be paid
     until age 55, if the officer is less than 55 years of age at vesting.
(b)  The benefits set forth in these columns assume that the participant elects
     a straight life annuity with five years certain. Such benefits are shown
     before deductions for 50% of Social Security benefits and other applicable
     offsets. In general, Federal law limits the annual benefit payable under
     the Retirement Plans to a participant at age 65, calculated in the form of
     a life annuity (with no period certain), to a specified amount ($135,000,
     adjusted as of January 1, 2000). Not being subject to limitations imposed
     on the Retirement Plans by Federal law, the SERP provides for annual
     benefits equal to up to one-half of covered compensation, provided that
     annual benefits under the SERP, before offset for annual benefits received
     under the Retirement Plans, may not exceed three times the $135,000 limit,
     as such limit may from time to time be increased. Years of service
     credited under the Retirement Plans and years of service as an officer
     credited under the SERP through 1999 for the Named Executive Officers were
     as follows: J.A. Ives, 16 and 16; F.C. Raskin, 22 and 21; C.R. Messer, 36
     and 23; W.J. Flaherty, 28 and 16; and L.W. Law, Jr., 24 and 24. Years of
     service for J.A. Ives is determined in accordance with his employment
     agreement described on page 56 hereof. Years of service under the SERP for
     F.C. Raskin, C.R. Messer, W.J. Flaherty and L.W. Law, Jr. equal years of
     service as an officer of Eastern or a subsidiary.

                                       55
<PAGE>

                            COMPENSATION OF TRUSTEES

   During 1999, each Trustee of Eastern who was not an officer of Eastern
received cash retainer fees at an annual rate of $10,000. The Chairman of each
of the Audit, Compensation and Nominating Committees received an annual
retainer fee of $4,000. In addition, each such non-officer Trustee received
$1,000 for each meeting session of the Board and each standing committee
meeting session he or she attended in person and $500 for each meeting attended
by telephone. Eastern also reimburses Trustees' travel expenses for attendance
at meetings. Eastern adopted the 1996 Non-Employee Trustees' Stock Option Plan
to replace the Restricted Stock Plan for Non-Employee Trustees and in order to
increase the proportion of compensation to Trustees for their services in the
form of Common Stock of Eastern and more closely align the interests of its
Trustees with those of its shareholders.

   Eastern's 1996 Non-Employee Trustees' Stock Option Plan provides for annual
grants of options to purchase 1,500 shares of Eastern's Common Stock to each
Trustee who at the time of grant serves as a Trustee but is not and has not
been an employee of Eastern or any of its subsidiaries for five years. Options
are granted on the day following the Annual Meeting of Shareholders through the
day following the 2001 Annual Meeting; provided that any eligible Trustee who
joins the Board at a time between regular option grant dates will receive an
option for 750 shares upon joining the Board. The exercise price of all options
granted under such Plan will be the fair market value of Eastern's Common Stock
on the date of grant. All options issued under the Plan become exercisable as
to one-half of the shares subject to the option on each of the first and second
anniversaries of the grant date. The latest date on which an option may be
exercised is the tenth anniversary of its grant date. Pursuant to such Plan,
options to purchase 1,500 shares of Eastern's Common Stock were granted on
April 29, 1999 to each Trustee other than J.A. Ives, R.R. Clayton and F. L.
Putnam, Jr. All options outstanding under this plan will become fully vested in
connection with the merger. For more information on this plan see "1996 Non-
Employee Trustees' Stock Option Plan" on page 23.

   Eastern maintains a Deferred Compensation Plan for Trustees under which
Trustees' cash fees may be deferred at the election of participants.
Participants may elect to credit amounts deferred to a Cash Account or to a
Share Unit Account. Interest based on the prime rate plus 1% (determined on the
first day of each calendar quarter) is credited to Cash Accounts at the end of
each calendar year. Amounts credited to Share Unit Accounts are converted to
Share Units based on the fair market value of Eastern's Common Stock on the
deferral date. Additional Share Units are credited to reflect dividends on
shares of such stock. Each Trustee receives a credit of 150 share units to his
or her Share Unit Account each quarter pursuant to an amendment to this plan,
which was adopted in 1998 to replace Eastern's Restricted Stock Plan for Non-
Employee Trustees, which expired in 1997. Cash Accounts and Share Unit Accounts
may be invested in mutual fund vehicles or Share Units based upon the value of
KeySpan common stock following a change of control of Eastern pursuant to a
plan amendment adopted in December, 1999. The balance in a participant's Cash
Account and Share Unit Account will be paid to him or her, or to his or her
beneficiary, in cash only, in a lump sum or installments when he or she ceases
to be a Trustee, or if he or she experiences serious financial hardship. For
more information on this plan see "Deferred Compensation Plan for Trustees" on
pages 22 through 23.

   Eastern provides term life insurance to each non-employee Trustee in the
amount of $50,000.

   Samuel Frankenheim, a Trustee of Eastern, is counsel to Ropes & Gray, a
Boston law firm which provided legal services to Eastern and its subsidiaries
during 1999, and which is expected to continue providing legal services to
Eastern and its subsidiaries during 2000. Fees paid for such services during
1999 were less than 5% of such law firm's 1999 gross revenues.

                                       56
<PAGE>

          TERMINATION OF EMPLOYMENT AND CHANGE OF CONTROL ARRANGEMENTS

   Eastern has entered into an employment agreement with Mr. Ives dated
November 27, 1991, and an employment agreement with Mr. Raskin dated September
1, 1998, under which, if the employment of either officer is terminated by
Eastern otherwise than for cause (as defined in such agreements, generally
including malfeasance or misfeasance), or if employment of either such officer
is terminated by the officer for good reason (as defined in such agreements,
generally including diminishment of authority, responsibility or cash
compensation opportunities), whether or not following a change of control, he
will be entitled in either such event to receive income equal to the salary
rate in effect at the time of such termination, together with continuation of
certain medical and other benefits. Subject to certain limitations, such income
and benefits would continue for thirty-six months in the case of Mr. Ives and
twenty-four months in the case of Mr. Raskin. If such termination occurs after
a change of control and the COC Agreement discussed above also applies,
Mr. Ives may elect the salary continuation or other benefit provisions
contained in his COC Agreement discussed above or the employment agreement
referred to in this paragraph, but shall not be entitled to a duplication of
any such benefit under both agreements. Mr. Raskin's agreement provides that he
would receive salary continuation or other benefit provisions under the COC
Agreement only if terminated following a change of control. Mr. Raskin's
agreement (as does his COC Agreement discussed above) also entitles him to
retain the use of his company car for the twenty-four month period following
termination. Mr. Ives' employment agreement established his initial salary rate
at $600,000 per year, subject to review and adjustment by the Compensation
Committee. In addition, under such employment agreements, Mr. Ives will be
credited with five years of service under Eastern's Retirement Plan and SERP
for his first year of employment and one and one-half years of service for each
year of employment thereafter. Mr. Raskin's benefits under the SERP will vest
if he is terminated before he reaches age 55, with payments commencing once he
reaches age 55. For further details, see "Officer Change of Control Agreements"
on pages 20 through 21 and "Supplemental Executive Retirement Plan" on pages 21
through 22.

   Eastern entered into a letter agreement with Mr. Clayton dated May 22, 1998,
pursuant to which, effective August 31, 1998, Mr. Clayton agreed to retire as
President and Chief Operating Officer of Eastern, remain on the Board, and
serve as a consultant to Eastern through August 31, 1999. Pursuant to this
agreement, Mr. Clayton received consulting fees of $121,333, plus reimbursement
of reasonable expenses, in 1999.

            SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

   Ownership of and certain transactions in Eastern's Common Stock by executive
officers, Trustees and certain other persons are required to be reported to the
SEC pursuant to Section 16 of the Exchange Act. Based upon a review of the
information provided to Eastern, all persons subject to these reporting
requirements filed the required reports on a timely basis during 1999, with the
exception that a Form 4 for Mr. Raskin with respect to two transactions was
filed late.

                                       57
<PAGE>

                         COMPENSATION COMMITTEE REPORT

   The duties of the Compensation Committee include approval of salary and
other compensation arrangements for Eastern's officers, and administration of
Eastern's incentive and stock plans, including the Executive Incentive
Compensation Plan and the Stock Option Plans.

Executive Officer Compensation

   The Committee's policy with respect to approving 1999 executive officer
compensation was to establish base salaries and annual incentive compensation
opportunities and to grant stock options which, in the judgment of the
Committee, were appropriate to provide fair compensation, to enable Eastern to
attract and retain executives with abilities and experience necessary to
implement Eastern's objectives, and to create incentives for high levels of
individual performance, consistent with attainment of the financial goals and
the overall best interests of Eastern. The Committee's judgments were based on
an assessment of each executive officer's current and past performance, his or
her business experience and level of responsibilities, information concerning
compensation paid to executive officers at similarly-sized companies, annual
compensation increases at such companies and recommendations and advice from
Eastern's chief executive officer and chief operating officer concerning
compensation levels for other officers. The Committee's decisions were not
based on any established formulas with respect to weighting of the foregoing
factors or the effect of any particular factor on any component of an executive
officer's compensation, except to the extent that annual bonuses are determined
in accordance with the factors described below. Information concerning
compensation levels at similarly-sized companies reviewed by the Committee
consisted of data as provided in previous years by Hewitt Associates, a
management consulting firm, concerning total compensation and the components
thereof (salary, annual bonus and long-term compensation), and year-to-year
compensation increases for officers of companies having levels of total
revenues approximately the same as that of Eastern and for overall industry
practice. The comparator data provided by Hewitt Associates were based on a
number of surveys covering companies representing a broad cross-section of U.S.
utilities. For 1999, base salaries and variable incentive compensation
opportunities for executive officers of Eastern as a group (including for the
CEO) were targeted at levels which would cause total annual compensation (i.e.,
base salary and bonus) of executive officers to average at about the median for
such group. Actual total compensation would fall below or exceed the comparator
group median to the extent Eastern's performance either fell substantially
below or substantially exceeded the performance targets established in the 1999
annual bonus program. The comparator group data previously provided by Hewitt
Associates also suggested that annual long-term compensation grants would be
appropriate so that levels of total compensation (including long-term
compensation) of Eastern's executive officers would approximate average total
compensation levels for similar positions at companies in the survey group.
With this information in mind, the Committee granted incentive and non-
qualified stock options in 1999 to Eastern's executive officers. Such options
were granted without stock appreciation rights, and at exercise prices equal to
the fair market value of Eastern's Common Stock on the dates of grant. In
determining the size of option grants, the Committee considered recommendations
of management and prior advice from Hewitt Associates.

   It was the Committee's judgment in establishing 1999 annual incentive
opportunities for executive officers that (i) more senior executive officers
should receive a larger portion of their potential total compensation in the
form of variable incentive awards than less senior executive officers; (ii)
appropriate maximum potential incentive awards for executive officers,
expressed as a percentage of salary, are 60% (for the chief executive officer
and chief operating officer), and 50% (for other executive officers),
reflecting the Committee's judgment as to an appropriate mix of base and
incentive compensation for executive officers at each level; (iii) a higher
percentage of incentive compensation opportunities for more senior executive
officers should be based on financial performance of Eastern and a lesser
percentage of such incentive opportunities should be based on individual
performance, than for less senior executive officers and other officers of
Eastern and its subsidiaries; (iv) financial incentive awards for executive
officers (other than an executive officer who is the president of a business
unit, as to which such executive officer's financial incentive awards would be
based entirely on the

                                       58
<PAGE>

performance of such business unit) would be determined based on a weighting of
the respective financial performances of the different business units of
Eastern, with Gas Distribution (including Boston Gas Company and Essex Gas
Company) receiving a weighting of 65%, Marine Transportation a weighting of 25%
and Service Businesses a weighting of 10%; and (v) 50% of any annual incentive
payment should be made in shares of Eastern's Common Stock. In accordance with
such policy, the Committee approved 1999 award opportunities under Eastern's
Executive Incentive Compensation Plan equal to up to 60% (in the case of the
CEO and the COO positions) or 50% (in the case of other executive officer
positions) of individual salaries. No portion of the bonus opportunity relating
to financial performance (i.e., up to a total of 75% of the potential annual
bonus amount in the case of Mr. Ives, 70% in the case of Messrs. Cook, Messer
and Raskin, and 67% for Messrs. Flaherty and Law) could be earned unless
minimum pre-tax income performance goals were met. The minimum pre-tax income
levels in 1999 for Eastern's business units were equal to approximately 85% of
the applicable target financial goal for such unit. At such minimum levels, the
financial performance award would equal 20% of the potential financial
performance opportunity with respect to Gas Distribution, Marine Transportation
and Service Businesses, respectively. Upon achievement of the targeted pre-tax
income goals, which were set at levels at which there was an estimated 50%
chance of achievement, the bonus award would equal 66 2/3% of the potential
financial performance bonus opportunity, with additional bonus amounts being
earned to the extent that pre-tax income levels exceeded the target level up to
an established maximum pre-tax income level, at which point the full financial
performance bonus opportunity would be earned. The portion of the annual bonus
opportunity based on achievement of individual management objectives could be
earned by an executive officer independent of the achievement of the financial
goals, so long as minimum financial results equal to 50% of the targeted levels
were achieved. The Committee's intent in establishing these management
objectives was that only outstanding performance by an executive officer would
qualify such officer to earn in excess of 75% of his or her management
performance bonus. Finally, the award opportunities provided that the Committee
be given authority in its judgment to approve discretionary awards in the event
that equity should so require. A discretionary award could not cause the total
award payable to any executive officer to exceed the maximum potential award
for such officer.

   Gas Distribution was successful in exceeding the minimum pre-tax income
goals established for 1999. Eastern's Marine Transportation and Service
Businesses units did not reach their minimum pre-tax income goals. As a result,
each of Eastern's executive officers, other than Mr. Cook, President of the
Marine Transportation subsidiaries, earned an annual bonus for 1999 based on
achievement of financial performance goals. In addition, each of Eastern's
executive officers received a bonus based on achievement of his individual
management objectives for 1999.

   Finally, it was the Committee's judgment that Eastern's return to
shareholders in 1999 resulting from the strategic initiatives pursued by
Eastern during the year, including the pending transaction with KeySpan,
justified the award to Eastern's headquarters' executive officers (and Mr.
Messer, President of the Gas Distribution subsidiaries) of discretionary
amounts sufficient to cause the financial portion of their individual awards to
reach the full potential for such portion of their award opportunities.

   As in previous years, the bonus payments to executive officers were made 50%
in shares of Eastern's Common Stock (valued as of the time that the awards are
approved by the Committee based on the average of the high and low trading
prices for the previous five business days) and 50% in cash. In this regard,
cash is withheld by Eastern from the cash portion of the bonus to cover state
and federal tax withholding requirements relating to an individual's total
bonus award. As a result, after-tax bonus awards received by executive officers
in the incentive plan are primarily in the form of shares of Eastern's stock.

   Section 162(m) of the Internal Revenue Code disallows tax deductions for
certain compensation paid by a public company to its chief executive officer or
any other executive officer named in its proxy statement compensation tables,
to the extent such compensation exceeds $1 million in any year. None of such
officers received taxable compensation from Eastern in excess of $1 million in
1999, and the Committee does not anticipate that such limitation will affect
deductibility of any compensation paid to Eastern's executive officers for
2000. With respect to Mr. Ives, in particular, the salary component of his
total compensation may be exempt

                                       59
<PAGE>

from such $1 million limitation under applicable rules because it is paid
pursuant to a binding written agreement executed prior to February 17, 1993.
Moreover, taxable income resulting from the exercise of outstanding stock
options issued under Eastern's 1982 and 1995 Stock Option Plans would also be
exempt from the $1 million limitation under applicable rules. Finally, the
Committee has adopted a policy under which any executive officer whose
compensation subject to Section 162(m) of the Code would exceed $1 million in
any year is encouraged to defer, if reasonably possible, all or a portion of
his or her annual incentive compensation for such year to the extent necessary
to avoid loss of Eastern's tax deduction for such executive's compensation.

CEO Compensation

   During 1999, Mr. Ives was paid a base salary, effective from February 1,
1999, at an annual rate equal to $772,000. Prior to February 1, 1999, Mr. Ives'
base salary had been set at $751,200 since February 1, 1998. Mr. Ives' base
salary is based on provisions in his employment agreement with Eastern,
described elsewhere in this proxy statement.

   In addition to his base salary, Mr. Ives was granted an incentive bonus
opportunity in 1999, as described above, under Eastern's Executive Incentive
Compensation Plan. Of Mr. Ives' potential award under such plan, 75% was based
on the achievement by the different business units of Eastern of their
respective pre-tax income goals for 1999 and 25% of such bonus opportunity was
based on the achievement by Mr. Ives of management objectives approved for him
by the Compensation Committee. Mr. Ives' objectives were to re-examine market,
regulatory and other important factors to identify and implement strategic
options to maximize shareholder value, and to construct and implement
management succession plans at Eastern and its subsidiaries that would assure
consistent and skilled leadership at all levels of the organization.

   Because the pre-tax income performance of the Gas Distribution business unit
for 1999 exceeded its minimum pre-tax financial performance goal, Mr. Ives was
entitled to a payment under the financial performance portion of his award
opportunity related to Gas Distribution. In addition, the Committee, after
consultation with the other non-management members of the Board of Trustees,
determined that Mr. Ives' overall achievement of his 1999 management objectives
equaled 100% of the maximum potential achievement. Finally, it was the
Committee's judgment that Mr. Ives' contribution to the strategic initiatives
pursued by Eastern in 1999, including the pending transaction with KeySpan,
justified the award to Mr. Ives of a discretionary amount sufficient to cause
the financial portion of his individual award to reach the full potential for
such award opportunity. Accordingly, Mr. Ives was entitled to a total bonus
payment of $463,200 for 1999. Under the terms of the 1999 incentive program,
50% of Mr. Ives' total incentive award was paid in shares of Eastern's Common
Stock and 50% was paid in cash.

   As described above, during 1999, Mr. Ives was granted stock options to
purchase 15,000 shares of Eastern's Common Stock at a price of $38.75 per
share, equal to the fair market value of such stock on the date of grant. Of
these stock options, 10,000 were incentive stock options and 5,000 were non-
qualified stock options.

   No member of the Compensation Committee is a current or former officer or
employee of Eastern or any of its subsidiaries.

Respectfully submitted,

Compensation Committee Members

Rina K. Spence, Chairperson
James R. Barker
John D. Curtain, Jr.
Leonard R. Jaskol

                                       60
<PAGE>

IV. OTHER INFORMATION

                               PERFORMANCE GRAPH

   The following graph compares the cumulative total shareholder return on
Eastern's Common Stock to the cumulative total return of the S&P 500 Index and
the Edward D. Jones ("EDJ") Diversified Gas Index over a five year period
ending December 31, 1999:

              Comparision of Five Year Cumulative Total Return(a)
                        [PERFORMANCE GRAPH APPEARS HERE]

<TABLE>
<CAPTION>
                                         Fiscal Year Ending December 31,
                                   --------------------------------------------
                                   1994  1995    1996    1997    1998    1999
                                   ---- ------- ------- ------- ------- -------
<S>                                <C>  <C>     <C>     <C>     <C>     <C>
Eastern Enterprises............... $100 $140.45 $146.94 $195.29 $197.23 $269.03
EDJ Diversified Gas Index (b).....  100  132.37  166.75  208.98  192.55  196.96
S&P 500 Index.....................  100  137.44  168.92  225.20  289.42  350.24
</TABLE>
- --------
(a) Based on an initial investment of $100 with dividends reinvested quarterly.
(b) The EDJ Diversified Gas Index is comprised of companies with at least 30
    percent, but less than 90 percent, of their operating revenues derived from
    natural gas distribution.

                                       61
<PAGE>

                   CERTAIN TRANSACTIONS AND OTHER DISCLOSURES

   The following table sets forth information with respect to indebtedness of
executive officers of Eastern to Eastern in excess of $60,000 since January 1,
1999.

<TABLE>
<CAPTION>
                                            Largest
                                           Aggregate
                                           Amount of
                                          Indebtedness               Weighted
                                          Outstanding   Amount of    Average
                                             at any    Indebtedness  Rate of
                                           Time Since  Outstanding   Interest
                                           January 1,  February 28,   Being
Name and Relationship to Eastern            1999(a)        2000     Charged(b)
- --------------------------------          ------------ ------------ ----------
<S>                                       <C>          <C>          <C>
J. Atwood Ives...........................   $771,382     $771,382      5.13%(c)
 Chairman and Chief Executive Officer

Fred C. Raskin...........................    365,497      365,497      5.32%
 President and Chief Operating Officer

Chester R. Messer........................    343,949      343,949      5.46%(c)
 Senior Vice President; President of
 Boston Gas Company and Essex Gas Company

Walter J. Flaherty.......................    312,237      312,237      5.43%(c)
 Executive Vice President and Chief
 Financial Officer

L. William Law, Jr. .....................    222,547      222,547      5.43%(c)
 Senior Vice President, General Counsel
 and Secretary
</TABLE>
- --------
(a) Indebtedness was incurred by the indicated executive officers under
    Eastern's executive stock purchase loan program pursuant to which officers
    of Eastern and its subsidiaries may borrow up to the amount of their
    individual base salaries solely to purchase shares of Eastern's Common
    Stock and/or pay for expenses and taxes related to such purchases. Each of
    the stock purchase loans described in the table was made on an unsecured
    basis and is payable seven months after demand.
(b) The interest rate as determined by the Compensation Committee of the Board,
    is the Applicable Federal Rate for short-term obligations under Section
    1274 of the Code, as published in the Internal Revenue Bulletin at the time
    the loan is made. Interest is payable quarterly on such loans.
(c) The interest rate shown in the table is the weighted average interest rate
    for such loans outstanding on February 28, 2000.

   Spence Centers for Women's Health, which were owned by RKS Health Ventures
Corporation, were acquired by Brigham and Women's Hospital in 1998. Subsequent
to the tenure of Rina K. Spence (a Trustee of Eastern) as an executive officer,
RKS Health Ventures Corporation made an assignment of its remaining assets for
the benefit of creditors under Massachusetts law on February 11, 1998.

   Eastern acquired Colonial Gas Company on August 31, 1999. Frederic L.
Putnam, Jr. (a Trustee of Eastern) was, immediately prior to the completion of
the Colonial Gas acquisition, the Chairman of the Board of Directors and Senior
Executive Officer of Colonial Gas. In connection with the closing of the
Colonial Gas acquisition, Mr. Putnam received a lump sum payment of $692,947
pursuant to the change in control provisions of his employment agreement with
Colonial Gas, and also received a lump sum payment of $92,665 under the
Colonial Gas Retention Bonus Plan. Following the completion of the Colonial Gas
acquisition, Eastern elected Mr. Putnam to serve as a Trustee on the Eastern
Board.

                                       62
<PAGE>

                INFORMATION WITH RESPECT TO CERTAIN SHAREHOLDERS

   The following table shows, as of December 31, 1999, any person who is known
by Eastern to be the beneficial owner of more than five percent of any class of
voting securities of Eastern. See "Stock Ownership of Trustees and Executive
Officers" for information concerning the beneficial ownership of voting
securities of Eastern by Trustees and executive officers of Eastern. For
purposes of this Proxy Statement, beneficial ownership is defined in accordance
with Rule 13d-3 under the Exchange Act and means generally the power to vote or
dispose of the securities, regardless of any economic interest therein.

<TABLE>
<CAPTION>
                                                            Amount and
                                                            Nature of   Percent
Name and Address                                            Beneficial    of
of Beneficial Owner                                        Ownership(a)  Class
- -------------------                                        ------------ -------
<S>                                                        <C>          <C>
GAMCO Investors, Inc.,....................................  1,653,466    6.12%
Gabelli Funds, LLC and
others (b)
One Corporate Center
Rye, New York 10580
</TABLE>
- --------
(a)  According to Schedule 13D/A filed with the SEC on December 23, 1999.
(b)  Nine entities and two individuals were included in the 13D/A filing with
     the SEC. In addition to the entities listed above, Gabelli Associates
     Fund, Gabelli Associates Limited, Gabelli Fund, LDC, Gabelli Securities,
     Inc., Gabelli & Company, Inc., Gabelli Group Capital Partners, Inc.,
     Gabelli Asset Management Inc., Marc J. Gabelli and Mario J. Gabelli were
     included. No single entity or individual is the beneficial owner of more
     than five percent of the voting securities of Eastern. In the aggregate,
     these entities and individuals exceed the five percent threshold.

                              INDEPENDENT AUDITORS

   The firm of Arthur Andersen LLP has been selected by the Board to act as
independent auditors of Eastern and its subsidiaries for the year 2000. Eastern
has been advised by such firm that neither it nor any member thereof has any
financial interest in or financial relationship with Eastern or its
subsidiaries. Representatives of Arthur Andersen LLP are expected to be present
at the 2000 Annual Meeting and will have the opportunity to make a statement if
they desire to do so and be available to respond to appropriate questions.

                             SHAREHOLDER PROPOSALS

   Shareholder proposals intended to be presented at the 2001 Annual Meeting of
Shareholders must be received at Eastern's principal executive offices no later
than November 16, 2000.

   If a proponent fails to notify Eastern by January 30, 2001 of a proposal for
consideration at the 2001 Annual Shareholders Meeting, then the proxies named
by management with respect to that meeting shall have discretionary voting
authority with respect to that proposal.

                            EXPENSES OF SOLICITATION

   The expenses of making this solicitation will be paid by Eastern, which may
solicit proxies by mail, telephone, telegraph or personal interview. Eastern
will reimburse banks, brokerage firms and other custodians, nominees and
fiduciaries for reasonable expenses incurred in sending proxy materials to
beneficial owners.

                                       63
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

   Eastern files annual, quarterly and current reports, proxy statements and
other information with the SEC. You may read and copy any reports, statements
or other information that Eastern files at the SEC's public reference rooms in
Washington, D.C., New York, New York and Chicago, Illinois. Please call the SEC
at 1-800-SEC-0330 for further information on the public reference rooms.
Eastern public filings are also available to the public from commercial
document retrieval services and at the Internet World Wide Web site maintained
by the SEC at http://www.sec.gov. Reports, proxy statements and other
information concerning Eastern also may be inspected at the offices of the
National Association of Securities Dealers, Inc., 1735 K Street, N.W.,
Washington, D.C. 20006.

   The SEC allows Eastern to "incorporate by reference" information into this
document, which means that Eastern can disclose important information to you by
referring to another document filed separately with the SEC. The information
incorporated by reference is deemed to be a part of this document, except for
any information superseded by information contained directly in this document.
This document incorporates by reference certain documents that Eastern has
previously filed with the SEC. These documents contain important business
information about Eastern and its financial condition.

   Eastern may have sent to you some of the documents incorporated by
reference, but you can obtain any of them through Eastern, the SEC or the SEC's
Internet World Wide Web site described above. Documents incorporated by
reference are available from Eastern without charge, excluding exhibits unless
specifically incorporated by reference as an exhibit to this document.
Shareholders may obtain documents incorporated by reference in this document by
requesting them in writing or by telephone at the following address and
telephone number:

                              Eastern Enterprises
                                9 Riverside Road
                          Weston, Massachusetts 02493
                                 (781) 647-2300
                         Attention: Corporate Relations

   Statements contained in this proxy statement or in any document incorporated
herein by reference as to the contents of any contract or other document
referred to herein or therein are not necessarily complete and in each instance
references made to such contract or other document filed as an exhibit to such
other document, and each such statement shall be deemed qualified in its
entirety by such reference.

   If you would like to request documents from Eastern, please do so at least
five business days before the date of the Annual Meeting in order to receive
timely delivery of such documents prior to the Annual Meeting.

   You should rely on the information contained or incorporated by reference in
this document to vote your shares at the special meeting. Eastern has not
authorized anyone to provide you with information that is different from what
is contained in this document. This document is dated March 16, 2000. You
should not assume that the information contained in this document is accurate
as of any date other than that date, and the mailing of this document to
shareholders at any time after that date does not create an implication to the
contrary. This proxy statement does not constitute a solicitation of a proxy in
any jurisdiction where, or to or from any person to whom, it is unlawful to
make such proxy solicitation in such jurisdiction.

                                       64
<PAGE>

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The following documents previously filed by Eastern with the SEC are
incorporated by reference in this proxy statement:

     . Eastern's Annual Report on Form 10-K for the fiscal year ended
  December 31, 1999 (which Annual Report accompanies this proxy statement).

   All documents filed by Eastern pursuant to 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 2000 Annual Meeting shall be deemed to be incorporated by
reference herein and to be a part hereof from the date of filing of such
documents. Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this proxy statement to the extent that a statement contained
herein or in any other subsequently filed document which also is or is deemed
to be incorporated by reference herein modifies or supersedes such statement.
Any statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this proxy statement.

   Information contained herein concerning KeySpan and ACJ Acquisition has been
supplied by KeySpan and has not been independently verified by Eastern. Except
as otherwise indicated, all other information contained herein has been
supplied by Eastern.

                                 OTHER MATTERS

   If sufficient votes in favor of any of the proposals set forth in the
attached Notice of Annual Meeting of Shareholders are not received by the time
scheduled for the meeting, the persons named as proxies may propose one or more
adjournments of the meeting for a period or periods of not more than 30 days in
the aggregate to permit further solicitation of proxies with respect to any of
such proposals. Any adjournment will require the affirmative vote of a majority
of the votes cast on the question in person or by proxy at the session of the
meeting to be adjourned. The persons named as proxies will vote in favor of
adjournment with respect to any proposal, those proxies which they are entitled
to vote in favor of such proposal. They will vote against adjournment with
respect to any proposal those proxies required to be voted against such
proposal. Eastern will pay the costs of any additional solicitation and of any
adjourned session.

   Except as otherwise disclosed in this Proxy Statement, the Board does not
know of any business to be presented for action by the shareholders in addition
to those items appearing in the notice of the meeting. However, if any
additional matters properly come before the meeting, or any adjournment
thereof, it is the intention of the persons named in the enclosed form of proxy
to vote said proxy in accordance with their judgment in such matters unless
instructed to the contrary.

   Reference is hereby made to the Declaration of Trust establishing Eastern
dated July 18, 1929, as amended, a copy of which is on file in the office of
the Secretary of The Commonwealth of Massachusetts. The name "Eastern
Enterprises" refers to the Trustees under said declaration as Trustees and not
personally; and no Trustee, shareholder, officer or agent of Eastern shall be
held to any personal liability in connection with the affairs of said Eastern,
but the trust estate only is liable.

                                          EASTERN ENTERPRISES
March 16, 2000

                                       65
<PAGE>

                             INDEX OF DEFINED TERMS

<TABLE>
<CAPTION>
                                                                           Page
Defined Term                                                               No.
- ------------                                                              ------
<S>                                                                       <C>
ACJ Acquisition..........................................................      3
Alternative Proposal.....................................................     28
Board....................................................................      1
COC Agreement............................................................     20
Code.....................................................................     18
Company Material Adverse Effect..........................................     35
Eastern..................................................................      3
EDJ......................................................................     61
Effective Date...........................................................     20
EnergyNorth..............................................................      3
Exchange Act.............................................................     12
Executive(s).............................................................     20
FERC.....................................................................     29
KeySpan..................................................................      4
LTM......................................................................     14
Merger Consideration.....................................................      4
MGL......................................................................     39
Named Executive Officers.................................................     52
Option Exchange Ratio....................................................     33
P/E Multiples............................................................     14
Parent Material Adverse Effect...........................................     35
Retirement Benefit.......................................................     21
Retirement Plans.........................................................     55
SEC...................................................................... Notice
Securities Act...........................................................     34
SERP.....................................................................     21
Trustee RS Plan..........................................................     23
United States Person.....................................................     19
</TABLE>

                                       66
<PAGE>

                                                                      APPENDIX A

                          AGREEMENT AND PLAN OF MERGER

                                  BY AND AMONG

                              EASTERN ENTERPRISES

                              KEYSPAN CORPORATION

                                      AND

                              ACJ ACQUISITION LLC

                         dated as of November 4, 1999,
                                   as amended
<PAGE>

   AGREEMENT AND PLAN OF MERGER, dated as of November 4, 1999 (this
"Agreement"), by and among Eastern Enterprises, a Massachusetts voluntary
association (the "Company"), KeySpan Corporation, a New York corporation
("Parent"), and ACJ Acquisition LLC, a Massachusetts limited liability company
which is directly and indirectly wholly owned by Parent ("Merger Sub").

   WHEREAS, the Company and Parent have determined to engage in a business
combination transaction on the terms stated herein; and

   WHEREAS, the Board of Trustees of the Company and the Board of Directors of
Parent have approved and deemed it advisable and in the best interests of their
respective shareholders to consummate the transactions contemplated herein
under which the businesses of the Company and Parent would be combined by means
of the merger of Merger Sub with and into the Company, with the Company being
the surviving entity, 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;

   NOW THEREFORE, in consideration of the premises and the representations,
warranties, covenants and agreements contained herein, the parties hereto,
intending to be legally bound hereby, agree as follows:

                                   ARTICLE I

                                   The Merger

   Section 1.01 The Merger. Upon the terms and subject to the conditions of
this Agreement:

   At the Effective Time (as defined in Section 1.03), Merger Sub shall be
merged with and into the Company (the "Merger") in accordance with the
Declaration of Trust (the "Company Declaration of Trust") of the Company, the
Certificate of Organization and Operating Agreement of Merger Sub, and Section
2 of Chapter 182 and Section 59 of Chapter 156C of the Massachusetts General
Laws (the "MGL"). The Company shall be the surviving entity in the Merger and
shall continue its corporate existence under the laws of The Commonwealth of
Massachusetts. The effects and the consequences of the Merger shall be as set
forth in Section 1.02. Throughout this Agreement, the term "Surviving Entity"
shall refer to the Company in its capacity as the surviving entity in the
Merger.

   Section 1.02 Effects of the Merger. At the Effective Time, the Company
Declaration of Trust, as in effect immediately prior to the Effective Time,
shall be the Declaration of Trust of the Surviving Entity until thereafter
amended as provided by law and such Declaration of Trust. Subject to the
foregoing, the additional effects of the Merger shall be as provided in the
applicable provisions of Chapter 182 of the MGL and Section 62 of the Limited
Liability Company Act of Massachusetts.

   Section 1.03 Effective Time of the Merger. On the Closing Date (as defined
in Section 3.01), certificates of merger complying with Section 61 of Chapter
156C and Section 2 of Chapter 182 of the MGL (the "Certificates of Merger")
shall be delivered to the Secretary of The Commonwealth of Massachusetts for
filing. The Merger shall become effective upon the filing of the Certificates
of Merger, or at such later date and time as may be set forth in the
Certificates of Merger (the "Effective Time").

   Section 1.04 Trustees. The managers of Merger Sub immediately prior to the
Effective Time shall be the trustees of the Surviving Entity and shall hold
office from the Effective Time until their respective successors are duly
elected or appointed and qualified in the manner provided in the Declaration of
Trust of the Surviving Entity, or as otherwise provided by the applicable law.

   Section 1.05 Officers. The officers of the Company immediately prior to the
Effective Time shall be the initial officers of, and shall hold the same
positions with, the Surviving Entity and shall hold office from the

                                      A-2
<PAGE>

Effective Time until their respective successors are duly elected or appointed
and qualified in the manner provided in the Declaration of Trust of the
Surviving Entity, or as otherwise provided by the applicable law.

                                   ARTICLE II

                              Treatment of Shares

   Section 2.01 Effect of the Merger on Capital Stock. At the Effective Time,
by virtue of the Merger and without any action on the part of any holder of any
capital stock of the Company or Merger Sub:

   (a) Membership Interests of Merger Sub. Each one percent of the issued and
outstanding membership interests in Merger Sub shall be converted into one
transferable certificate of participation or share of the Surviving Entity.

   (b) Cancellation of Certain Company Common Stock. Each share of common
stock, par value $1.00 per share, of the Company (the "Company Common Stock")
that is owned by the Company as treasury stock and all shares of Company Common
Stock that are owned by Parent, Merger Sub or any other wholly-owned subsidiary
of Parent shall be canceled and retired and shall cease to exist and no cash or
other consideration shall be delivered in exchange therefor.

   (c) Conversion of Company Common Stock. Subject to the provisions of this
Section 2.01, each share of Company Common Stock, other than Dissenting Shares
(as defined in Section 2.01(d)) and shares canceled pursuant to Section
2.01(b), issued and outstanding immediately prior to the Effective Time (other
than shares held as treasury shares by the Company) shall by virtue of the
Merger and without any action on the part of the holder thereof, be converted
into the right to receive $64.00 in cash, payable without interest, to the
holder of such share, upon surrender, in the manner provided in Section 2.02
hereof, of the certificate formerly evidencing such share (as adjusted pursuant
to the following sentence, the "Merger Consideration"). In the event that the
Effective Time shall not have occurred on or prior to the later of (i) the date
that is nine months after the date of this Agreement or (ii) the date that is
ninety days after the date on which the State of New Hampshire statutory
approvals shall have been obtained and become Final Orders (as defined herein)
(the "Adjustment Date"), the Merger Consideration 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 $0.006 per share (such amount,
the "Increased Consideration"), provided, that the aggregate amount of the
Increased Consideration shall be reduced by the aggregate amount of any per
share increase in dividends permitted by Section 6.01(b) attributable to any
period during which any Increased Consideration is accruing that is actually
paid by the Company.

   (d) Dissenting Shares. The holders of shares of Company Common Stock who
dissent from the Merger within the time and in the manner provided in Sections
86 through 98 of Chapter 156B of the MGL shall have substantially the same
rights as they would have if the Company were at the Effective Date a
Massachusetts business corporation. Each outstanding share of Company Common
Stock the holder of which has perfected his appraisal rights under Chapter 156B
of the Massachusetts General Laws (the "MBCA") and has not effectively
withdrawn or lost such right as of the Effective Time (the "Dissenting Shares")
shall not be converted into or represent a right to receive the Merger
Consideration, and the holder thereof shall be entitled only to such rights as
are granted by applicable law; provided, however, that any Dissenting Share
held by a person at the Effective Time who shall, after the Effective Time,
withdraw the demand for payment for shares or lose the right to payment for
shares, in either case pursuant to applicable law, shall be deemed to be
converted into, as of the Effective Time, the right to receive the Merger
Consideration. The Company shall give Parent prompt notice upon receipt by the
Company of any such written demands for payment of the fair value of such
shares of Company Common Stock and of withdrawals of such notice and any other
instruments provided pursuant to applicable law. Any payments made in respect
of Dissenting Shares shall be made by the Surviving Corporation.

                                      A-3
<PAGE>

   (e) At the Effective Time, all options to purchase Company Common Stock then
outstanding under the Company's 1982 Stock Option Plan, 1995 Stock Option Plan
and 1996 Trustees' Stock Option Plan (collectively, the "Company Stock Option
Plans") shall be treated by Parent in accordance with Section 7.10 hereof.

   Section 2.02 Exchange of Certificates.

   (a) Deposit with Exchange Agent. As soon as practicable after the Effective
Time, the Surviving Corporation shall deposit with a bank or trust company
mutually agreeable to Parent and the Company (the "Exchange Agent"), pursuant
to an agreement in form and substance reasonably acceptable to Parent and the
Company an amount of cash required for the payment of the Merger Consideration
upon surrender of certificates in accordance with Section 2.01(c).

   (b) Exchange and Payment Procedures. As soon as practicable after the
Effective Time, Parent shall cause Parent's transfer agent and registrar, as
paying agent (the "Paying Agent") to mail to each holder of record as of the
Effective Time of a certificate or certificates representing shares of Company
Common Stock (the "Certificates") that have been converted pursuant to Section
2.01: (i) a letter of transmittal (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 and receiving the Merger
Consideration to which such holder shall be entitled therefor pursuant to
Section 2.01. Upon surrender of a 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 Certificate
shall be entitled to receive in exchange therefor the Merger Consideration. In
the event the Merger Consideration is to be delivered to any person who is not
the person in whose name the Certificate surrendered in exchange therefor is
registered in the transfer records of the Company, the Merger Consideration may
be delivered to a transferee if the Certificate 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 as contemplated by this
Section 2.02, each Certificate (other than a certificate representing shares of
Company Common Stock to be canceled in accordance with Section 2.01(b)) shall
be deemed at any time after the Effective Time to represent only the right to
receive upon such surrender the Merger Consideration contemplated by this
Section 2.02. No interest will be paid or will accrue on any cash payable to
holders of Certificates pursuant to provisions of this Article II.

   (c) Closing of Transfer Books. The Merger Consideration paid upon the
surrender of Certificates in accordance with the terms of Section 2.01(c) 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 the Surviving
Corporation, they shall be canceled and exchanged for the appropriate amount of
cash as provided in Section 2.01 and in this Section 2.02.

   (d) Termination of Exchange Agent. All funds held by the Exchange Agent for
payment to the holders of unsurrendered Certificates and unclaimed at the end
of one year from the Effective Time shall be returned to the Surviving
Corporation, after which time any holder of unsurrendered Certificates shall
look as a general creditor only to Parent for payment of such funds to which
such holder may be due, subject to applicable law.

   (e) Escheat. None of Parent, Merger Sub or the Surviving Corporation shall
be liable to any person for such shares or funds delivered to a public official
pursuant to any applicable abandoned property, escheat or similar law.


                                      A-4
<PAGE>

                                  ARTICLE III

                                  The Closing

   Section 3.01 Closing. The closing of the Merger (the "Closing") shall take
place at the offices of Ropes & Gray, One International Place, Boston,
Massachusetts, at 10:00 a.m., Boston time, on the second business day
immediately following the date on which the last of the conditions set forth in
Article VIII hereof is fulfilled or waived (other than conditions that by their
nature are required to be performed on the Closing Date, but subject to
satisfaction of such conditions), or at such other time and date and place as
the Company and Parent shall mutually agree (the "Closing Date"); provided,
however, that the Closing Date shall be not less than 30 days after the date of
mailing of the Notice of Election as provided in Section 2.01(k).

                                   ARTICLE IV

                 Representations and Warranties of the Company

   The Company represents and warrants to Parent as follows:

   Section 4.01 Organization and Qualification. Except as set forth in Section
4.01 of the Company Disclosure Schedule (as defined in Section 7.06(ii)), the
Company and each of its subsidiaries (as defined below) is a Massachusetts
voluntary association, in the case of the Company, and a corporation, in the
case of each of its subsidiaries, in each case duly organized, validly existing
and in good standing under the laws of its jurisdiction of organization, has
all requisite corporate or similar power and authority, and has been duly
authorized by all necessary approvals and orders, to own, lease and operate its
assets and properties to the extent owned, leased and operated and to carry on
its business as it is now being conducted and is duly qualified and in good
standing to do business in each jurisdiction in which the nature of its
business or the ownership or leasing of its assets and properties makes such
qualification necessary, other than in such jurisdictions where the failure to
be so qualified and in good standing would not individually or in the aggregate
reasonably be expected to have a Company Material Adverse Effect (as defined
below). The term "Company Material Adverse Effect" means, for purposes of this
Agreement, any change, event or effect that is materially adverse to the
business, properties, financial condition or results of operations of the
Company and its subsidiaries taken as a whole (other than changes, events or
effects that are the effect of economic factors affecting the economy as a
whole or that are the effect of factors generally affecting the specific
industries or markets in which the Company and its subsidiaries operate or
compete); provided, however, that a Company Material Adverse Effect shall not
include any adverse effect primarily arising out of or resulting primarily from
actions contemplated by the parties in connection with, or that are primarily
attributable to the announcement of, this Agreement and the transactions
contemplated hereby. As used in this Agreement, the term "subsidiary" of a
person shall mean any corporation or other entity (including partnerships and
other business associations) of which a majority of the outstanding capital
stock or other voting securities having voting power under ordinary
circumstances to elect directors or similar members of the governing body of
such corporation or entity shall at the time be held, directly or indirectly,
by such person.

   Section 4.02 Subsidiaries. Section 4.02 of the Company Disclosure Schedule
sets forth a description as of the date hereof, of all subsidiaries and joint
ventures of the Company, including the name of each such entity, the state or
jurisdiction of its incorporation or organization, the Company's interest
therein and a brief description of the principal line or lines of business
conducted by each such entity. As of the date hereof, the Company is an exempt
holding company under the Public Utility Holding Company Act of 1935, as
amended (the "1935 Act"). Except as set forth in Section 4.02 of the Company
Disclosure Schedule, all of the issued and outstanding shares of capital stock
owned by the Company of each subsidiary of the Company are validly issued,
fully paid, nonassessable and free of preemptive rights, and are owned,
directly or indirectly, by the Company free and clear of any liens, claims,
encumbrances, security interests, equities, charges and options of any nature
whatsoever, and there are no outstanding subscriptions, options, calls,
contracts, voting trusts,

                                      A-5
<PAGE>

proxies, rights or warrants, including any right of conversion or exchange
under any outstanding security, instrument or other agreement, obligating any
such subsidiary to issue, deliver or sell, or cause to be issued, delivered or
sold, additional shares of its capital stock or obligating it to grant, extend
or enter into any such agreement or commitment. As used in this Agreement, the
term "joint venture" of a person shall mean any corporation or other entity
(including partnerships and other business associations) that is not a
subsidiary of such person, in which such person or one or more of its
subsidiaries owns an equity interest, other than equity interests held for
passive investment purposes which are less than 5% of any class of the
outstanding voting securities or equity of any such entity.

   Section 4.03 Capitalization. The authorized capital stock of the Company
consists of 50,000,000 shares of Company Common Stock. As of the close of
business on November 2, 1999, there were issued and outstanding 27,020,034
shares of Company Common Stock. All of the issued and outstanding shares of the
capital stock of the Company are validly issued, fully paid, nonassessable and
free of preemptive rights. Except as set forth in Section 4.03 of the Company
Disclosure Schedule and under the Company Rights Agreement (as defined below),
as of the date hereof, there are no outstanding subscriptions, options, calls,
contracts, voting trusts, proxies, or other commitments, understandings,
restrictions, arrangements, rights or warrants, including any right of
conversion or exchange under any outstanding security, instrument or other
agreement, obligating the Company or any of the subsidiaries of the Company to
issue, deliver or sell, or cause to be issued, delivered or sold, additional
shares of the capital stock of the Company, or obligating the Company to grant,
extend or enter into any such agreement or commitment. Since November 2, 1999,
the Company has not issued any shares of Company Common Stock or any common
stock equivalents. True, accurate and complete copies of the Declaration of
Trust and by-laws, or similar governing documents of the Company as in effect
on the date hereof, have been made available to the Parent.

   Section 4.04 Authority; Non-Contravention; Statutory Approvals; Compliance.

   (a) Authority. The Company has all requisite corporate or similar power and
authority to enter into this Agreement and, subject to obtaining the Company
Shareholders' Approval (as defined in Section 4.13) and the Company Required
Statutory Approvals (as defined in Section 4.04(c)), to consummate the
transactions contemplated hereby. The execution and delivery of this Agreement
and the consummation by the Company of the transactions contemplated hereby
have been duly authorized by all necessary corporate action on the part of the
Company subject to obtaining the Company Shareholders' Approval. This Agreement
has been duly and validly executed and delivered by the Company and, assuming
the due authorization, execution and delivery by the other signatories hereto,
constitutes the valid and binding obligation of the Company enforceable against
it in accordance with its terms.

   (b) Non-Contravention. Except as set forth in Section 4.04(b) of the Company
Disclosure Schedule, the execution and delivery of this Agreement by the
Company do not, and the consummation of the transactions contemplated hereby
will not, violate, conflict with, or result in a breach of any provision of, or
constitute a default (with or without notice or lapse of time or both) under,
or result in a right of termination, cancellation, or acceleration of any
obligation under or the loss of a material benefit under, or result in the
creation of any lien, security interest, charge or encumbrance ("Liens") upon
any of the properties or assets of the Company or any of its subsidiaries or
joint ventures (any such violation, conflict, breach, default, right of
termination, cancellation or acceleration, loss or creation, a "Violation" with
respect to the Company (such term when used in Article V having a correlative
meaning with respect to Parent)) pursuant to any provisions of (i) the
Declaration of Trust or the Company Articles, as the case may be, or the by-
laws of the Company or the articles of organization, by-laws or similar
governing documents of any of its subsidiaries or any of its joint ventures,
(ii) subject to obtaining the Company Required Statutory Approvals and the
receipt of the Company Shareholders' Approval, any statute, law, ordinance,
rule, regulation, judgment, decree, order, injunction, writ, permit or license
of any Governmental Authority (as defined in Section 4.04(c)) applicable to the
Company, any of its subsidiaries or any of its joint ventures, or any of their
respective properties or assets or (iii) subject to obtaining the third-party
consents or other approvals set forth in Section 4.04(b) of the Company
Disclosure Schedule (the "Company Required Consents") any note, bond, mortgage,
indenture, deed of trust, license,

                                      A-6
<PAGE>

franchise, permit, concession, contract, lease or other instrument, obligation
or agreement of any kind to which the Company, any of its subsidiaries or any
of its joint ventures is a party or by which it or any of its properties or
assets may be bound or affected, excluding from the foregoing clauses (ii) and
(iii) such Violations as would not individually or in the aggregate reasonably
be expected to have a Company Material Adverse Effect.

   (c) Statutory Approvals. Except as described in Section 4.04(c) of the
Company Disclosure Schedule, no declaration, filing or registration with, or
notice to or authorization, consent or approval of, any court, federal, state,
local or foreign governmental or regulatory body (including a stock exchange or
other self-regulatory body) or authority (each, a "Governmental Authority") is
necessary for the execution and delivery of this Agreement by the Company or
the consummation by the Company of the transactions contemplated hereby, the
failure to obtain, make or give which would individually or in the aggregate
reasonably be expected to have 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, if any, as are necessary to avoid a violation of law.

   (d) Compliance. Except as set forth in Section 4.04(d) or Section 4.11 of
the Company Disclosure Schedule, or as disclosed in the Company SEC Reports (as
defined in Section 4.05) filed prior to the date hereof, neither the Company,
nor any of its subsidiaries nor (to the best of its knowledge) any of its joint
ventures is in violation of or to the Company's knowledge under investigation
with respect to or has been given notice of or been charged with any purported
violation of, any law, statute, order, rule, regulation or judgment (including,
without limitation, any applicable Environmental Law, as defined in Section
4.11 (f)(ii)) of any Governmental Authority except for violations that are not
individually or in the aggregate reasonably expected to have a Company Material
Adverse Effect. Except as set forth in Section 4.04(d) of the Company
Disclosure Schedule or in Section 4.11 of the Company Disclosure Schedule, the
Company and its subsidiaries and joint ventures have all permits, licenses,
franchises and other governmental authorizations, consents and approvals
necessary to conduct their respective businesses as currently conducted in all
respects, except those which the failure to obtain would not individually or in
the aggregate reasonably be expected to have a Company Material Adverse Effect.
Except as set forth in Section 4.04(d) of the Company Disclosure Schedule, the
Company and each of its subsidiaries and joint ventures are not 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 under, (i) the Declaration or its
articles of organization (or similar governing documents), as the case may be,
or its 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 it is bound or to which any of
its property is subject, except for breaches, violations or defaults that are
not individually or in the aggregate reasonably expected to have a Company
Material Adverse Effect.

   Section 4.05 Reports and Financial Statements. The filings required to be
made by the Company and its subsidiaries since December 31, 1996 under the
Securities Act of 1933, as amended (the "Securities Act"), the Securities
Exchange Act of 1934, as amended (the "Exchange Act") and applicable state
public utility laws and regulations have been filed with the Securities and
Exchange Commission (the "SEC"), or the appropriate state public utilities
commission, as the case may be, including all forms, statements, reports,
agreements (oral or written), exhibits, supplements and amendments appertaining
thereto, and complied, as of their respective dates, in all material respects
with all applicable requirements of the appropriate statute and the rules and
regulations thereunder. The Company has made available to Parent a true and
complete copy of each report, schedule, registration statement and definitive
proxy statement filed by the Company with the SEC since December 31, 1996 (as
such documents have since the time of their filing been amended, the "Company
SEC Reports"). As of their respective dates, the Company SEC Reports, including
without limitation any financial statements or schedules included therein, did
not contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading and
any forms, reports or other documents filed by

                                      A-7
<PAGE>

the Company with the SEC after the date hereof did not and will not contain any
untrue statement of a material fact or omit to state a material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading. The audited
consolidated financial statements and unaudited interim financial statements of
the Company included in the Company SEC Reports (collectively, the "Company
Financial Statements") have been prepared in accordance with generally accepted
accounting principles applied on a consistent basis ("GAAP"), 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 the
consolidated financial position of the Company as of the dates thereof and the
consolidated results of operations and cash flows for the periods then ended.

   Section 4.06 Conduct of Business; Absence of Certain Changes or Events;
Absence of Undisclosed Liabilities.

   (a) Except as disclosed in the Company SEC Reports filed prior to the date
hereof or as set forth in Section 4.06 of the Company Disclosure Schedule,
since December 31, 1998, the Company and each of its subsidiaries have
conducted their business only in the ordinary course of business consistent
with past practice and no event has occurred which has had, and no fact or
condition exists that would have or is reasonably likely to have, individually
or in the aggregate, a Company Material Adverse Effect.

   (b) Neither the Company nor any of its subsidiaries has any liabilities or
obligations (whether absolute, contingent, accrued or otherwise) of a nature
required by GAAP to be reflected in a consolidated corporate balance sheet,
except liabilities, obligations, or contingencies that are accrued or reserved
against in the consolidated financial statements of the Company or are
reflected in the notes thereto for the year ended December 31, 1998 or that
were incurred after December 31, 1998 in the ordinary course of business and
are not individually or in the aggregate reasonably likely to have a Company
Material Adverse Effect.

   Section 4.07 Litigation. Except as disclosed in the Company SEC Reports
filed prior to the date hereof or as set forth in Section 4.07, Section 4.09 or
Section 4.11 of the Company Disclosure Schedule, (i) there are no claims,
suits, actions or proceedings, pending or to the knowledge of the Company
threatened, nor to the knowledge of the Company are there any investigations or
reviews pending or threatened against, relating to or affecting the Company or
any of its subsidiaries or any Company Employee Benefit Plan (as defined in
Section 4.10 herein), (ii) there are no judgments, decrees, injunctions, rules
or orders of any court, governmental department, commission, agency,
instrumentality or authority or any arbitrator applicable to the Company or any
of its subsidiaries or any Company Employee Benefit Plan except for any of the
foregoing under clauses (i) and (ii) that would not individually or in the
aggregate reasonably be expected to have a Company Material Adverse Effect.

   Section 4.08 Registration Statement and Proxy Statement. The Proxy Statement
relating to the Company Special Meeting (as defined below), as amended or
supplemented from time to time (as so amended and supplemented, the "Proxy
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 Special Meeting (as defined in Section 7.04(a)), contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein not
misleading and (ii) the proxy statement, in definitive form (the "Proxy
Statement"), relating to the Company Special Meeting (as defined below) shall
not, at the dates mailed to shareholders and at the time of the Company Special
Meeting, contain any untrue statement of a material fact or omit to state any
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they are made, not
misleading; provided that no representation or warranty is made by the Company
with respect to statements made or incorporated by reference in the Proxy
Statement based on information supplied in writing by Parent or Merger Sub for
inclusion or incorporation by reference therein.

                                      A-8
<PAGE>

The Proxy Statement, insofar as it relates to the Company or any of its
subsidiaries, shall comply as to form in all material respects with the
applicable provisions of the Securities Act and the Exchange Act and the rules
and regulations thereunder.

   Section 4.09 Tax Matters.

   (a) For purposes of this Agreement, "Tax" or "Taxes" shall mean all taxes of
any kind whatsoever, together with any interest and any penalties, additions to
tax or additional amounts, as well as any and all, fees, levies, duties,
tariffs, imposts, and governmental impositions or charges in the nature of (or
similar to) taxes, payable to any federal, state, local or foreign taxing or
governmental authority; and "Tax Returns" shall mean returns, reports, and
information statements with respect to Taxes required to be filed with the IRS
or any other federal, foreign, state or provincial taxing authority, domestic
or foreign, including, without limitation, consolidated, combined and unitary
tax returns, and including any schedules or attachments thereto and including
any amendments thereto.

   (b) Other than as disclosed in the Company Disclosure Schedule and except as
would not have a Company Material Adverse Effect, (i) the Company and its
subsidiaries have timely filed all Tax Returns required to be filed by them
(giving effect to extensions) and all such Tax Returns are true, correct and
complete in all material respects, (ii) the Company and its subsidiaries have
paid and discharged all Taxes due, and (iii) there are no other Taxes that
would be due if asserted by a taxing authority, except with respect to which
the Company is maintaining reserves to the extent currently required. Other
than as disclosed in the Company Disclosure Schedule and except as does not
involve or would not result in liability to the Company or any of its
subsidiaries that individually or in the aggregate constitutes a Company
Material Adverse Effect: (i) there are no Tax liens on any assets of the
Company or any subsidiary thereof; and (ii) neither the Company nor any of its
subsidiaries has granted any waiver of any statute of limitations with respect
to, or any extension of a period for the assessment of, any Tax; (iii) no audit
or other proceeding with respect to any Taxes due from the Company or any of
its subsidiaries or any Tax Return of the Company or its subsidiaries is
pending, threatened in writing or being conducted by any taxing authority; (iv)
neither the Company nor any of its subsidiaries (A) has ever been a member of
any consolidated, combined, unitary or aggregate group filing a consolidated
federal income Tax Return (other than a group the common parent of which was
the Company) or (B) has any liability for the Taxes of any person (other than
the Company and its subsidiaries), including liability arising form the
application of Treas. Reg. section 1.1502-6 or any analogous provision of
state, local or foreign law, or as a transferee or successor, by contract or
otherwise; (v) all Taxes required to be withheld, collected or deposited with
respect to the Company and each of its subsidiaries have been timely withheld,
collected or deposited, as the case may be, and, to the extent required, have
been paid to the relevant taxing authority; (vi) no consent under Section
341(f) of the Code has been filed with respect to the Company or any of its
subsidiaries; (vii) as of the Closing Date, neither the Company nor any of its
subsidiaries shall be a party to, be bound by, or have any obligation under,
any Tax sharing agreement or similar contract or arrangement, and (viii) there
is no contract or agreement, plan or arrangement by the Company or any of its
subsidiaries covering any person that, individually or collectively, could give
rise to the payment of money or other property or the acceleration or provision
of any rights or benefits, by reason of the transactions contemplated by this
Agreement, of any amount that would not be deductible by the Company or its
subsidiaries (including defined taxes) by reason of Section 280G or 162(m) of
the Code. The accruals and reserves for Taxes (including deferred taxes)
reflected in the balance sheet of the Company as at September 30, 1999 included
in the Company's Quarterly Report on Form 10-Q for the quarter ended September
30, 1999 are in all material respects adequate to cover all Taxes (including
deferred taxes) required to be accrued through the date thereof (including
interest and penalties, if any, thereon and Taxes being contested) in
accordance with generally accepted accounting principles applied on a
consistent basis with the balance sheet included in the Company Financial
Statements, and the accrual and reserves for Taxes (including deferred taxes)
reflected in the books and records of the Company as at the last day of the
Company's most recently completed fiscal month end are in all material respects
adequate to cover all Taxes (including deferred taxes) required to be accrued
through such date (including interest and penalties, if any, thereon and Taxes
being contested) in accordance with

                                      A-9
<PAGE>

generally accepted accounting principles applied on a consistent basis with the
balance sheet included in the Company Financial Statements.

   Section 4.10 Employee Matters; ERISA.

   (a) Schedule 4.10 of the Company Disclosure Schedule lists each material
plan, program and arrangement maintained or sponsored by the Company or its
subsidiaries (or to which the Company or its subsidiaries contributes or is
obligated to contribute) or under which the Company or any of its subsidiaries
has any present or future liability that provides retirement benefits, deferred
compensation, stock-based compensation, welfare benefits, incentive
compensation, severance, retention, change of control, employment or fringe
benefits (each, other than multiemployer plans, a "Company Employee Benefit
Plan"), including each such plan that constitutes an "employee benefit plan" as
defined in Section 3(3) of the Employee Retirement Income Security Act of 1974,
as amended ("ERISA") (each, other than multiemployer plans, an "ERISA Plan").
Each Company Employee Benefit Plan has been established, administered and
operated in all material respects in accordance with its terms and with
applicable law. Each ERISA Plan that is intended to be qualified within the
meaning of 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 that could reasonably be
expected to have a materially 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) copies of each
Company Employee Benefit Plan that has been reduced to writing, (ii) the most
recent Form 5500 and attached schedules for each Company Employee Benefit Plan
subject to such reporting, (iii) the most recent determination of the IRS with
respect to the qualified status of each ERISA Plan that is intended to qualify
under Section 401(a) of the Code, (iv) any trust agreement related to a Company
Employee Benefit Plan; (v) any summary plan description under a Company
Employee Benefit Plan; (vi) the most recent audited financial statements for
each Company Employee Benefit Plan, if applicable; and (vii) the most recent
actuarial valuation reports for each Company Employee Benefit Plan, if
applicable.

   (c) Except as set forth in Schedule 4.10 of the Company Disclosure Schedule,
neither the Company nor any of its subsidiaries, nor any other person that
would be treated as a single employer with the Company and its subsidiaries
under Section 4001(b) of ERISA (an "ERISA affiliate"), has, within the five-
year period preceding the date of this Agreement, at any time contributed, or
had an obligation to contribute, to any "multiemployer plan," as that term is
defined in Section 4001 of ERISA.

   (d) No event has occurred and there exists no condition or set of
circumstances in connection with any Company Employee Benefit Plan that has
subjected or could reasonably be expected to subject the Company or any
subsidiary either directly or by reason of their affiliation with any member of
their "Controlled Group" (defined as any organization which is a member of a
controlled group of organizations within the meaning of Code sections 414(b),
(c), (m) or (o)), to any tax fine, lien or penalty imposed by ERISA or by
Chapter 43 of the Code, except for instances of non-compliance which could not
reasonably be expected to have a Company Material Adverse Effect.

   (e) All employer contributions required to have been made with respect to
the Company Employee Benefit Plans, including, for this purpose, multiemployer
plans, have been made in material compliance with the terms of such plans and
applicable law.

   (f) Except as would not have a Company Material Adverse Effect, no
"reportable event" (as such term is defined in ERISA section 4043) has
occurred.

   Section 4.11 Environmental Protection. Except as set forth in Section 4.11
of the Company Disclosure Schedule or in the Company SEC Reports filed prior to
the date hereof:

   (a) Compliance. The Company and each of its subsidiaries are in compliance
with all applicable Environmental Laws (as defined in Section 4.11 (f)(ii))
except where the failure to be in such compliance

                                      A-10
<PAGE>

would not individually or in the aggregate reasonably be expected to have a
Company Material Adverse Effect, and neither the Company nor any of its
subsidiaries has received any written communication from any Governmental
Authority that alleges that the Company or any of its subsidiaries is not in
compliance with applicable Environmental Laws except for matters which could
not, individually or in the aggregate, reasonably be expected to have a Company
Material Adverse Effect.

   (b) Environmental Permits. The Company and each of its subsidiaries has
obtained or has applied for all environmental, health and safety permits and
governmental authorizations (collectively, the "Environmental Permits")
necessary for the construction of its facilities or the conduct of its
operations, and all such Environmental Permits are in good standing or, where
applicable, a renewal application has been timely filed and is pending agency
approval, and the Company and its subsidiaries are in compliance with all terms
and conditions of the Environmental Permits, except where the failure to obtain
or to be in such compliance would not individually or in the aggregate
reasonably be expected to have a Company Material Adverse Effect.

   (c) Environmental Claims. There is no Environmental Claim (as defined in
Section 4.11(f)(i)) pending (i) against the Company or any of its subsidiaries,
or (ii) against any real or personal property or operations that the Company or
any of its subsidiaries owns, leases or manages, in whole or in part that, if
adversely determined, would individually or in the aggregate reasonably be
expected to have a Company Material Adverse Effect.

   (d) Releases. Except for Releases of Hazardous Materials the liability for
which would not reasonably be expected to have a Company Material Adverse
Effect, there have been no Releases (as defined in Section 4.11(f)(iv)) of any
Hazardous Material (as defined in Section 4.1 l(f)(iii)) that would be
reasonably likely to form the basis of any Environmental Claim against the
Company or any of its subsidiaries.

   (e) Predecessors. The Company has no knowledge of any Environmental Claim
pending or threatened, or of any Release of Hazardous Materials that would be
reasonably likely to form the basis of any Environmental Claim, in each case
against any person or entity (including, without limitation, any predecessor of
the Company or any of its subsidiaries) whose liability the Company or any of
its subsidiaries has or may have retained or assumed either contractually or by
operation of law, except for Releases of Hazardous Materials the liability for
which would not individually or in the aggregate reasonably be expected to have
a Company Material Adverse Effect.

   (f) As used in this Agreement:

     (i) "Environmental Claim" means any and all administrative, regulatory
  or judicial actions, suits, demands, demand letters, directives, claims,
  liens, investigations, proceedings or notices of noncompliance or violation
  by any person or entity (including any Governmental Authority) alleging
  potential liability (including, without limitation, potential
  responsibility for or liability for enforcement costs, investigatory costs,
  cleanup costs, governmental response costs, removal costs, remedial costs,
  natural-resources damages, property damages, personal injuries, fines 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 their respective subsidiaries or joint
  ventures; 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, local laws, rules,
  ordinances and regulations 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, processing,
  distribution, use, treatment, storage, disposal, transport or handling of
  Hazardous Materials.

                                      A-11
<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, coal tar residue, any
  and all products or by-products of gas manufacture, the presence of PCB's
  in reportable concentrations in soil, groundwater, service-water or pipes
  and transformers or other equipment that contain dielectric fluid
  containing PCB's in regulated concentrations; 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," "hazardous constituents" 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 or joint ventures operates or has
  stored, treated or disposed of Hazardous Materials.

     (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.

   Section 4.12 Regulation as a Utility. Except as set forth in Section 4.12 of
the Company Disclosure Schedule, neither the Company nor any "subsidiary
company" or "affiliate" (as such terms are defined in the 1935 Act) of the
Company is subject to regulation as (i) a "holding company," a "public-utility
company," a "subsidiary company" or an "affiliate" of a "holding company,"
within the meaning of sections 2(a)(7), 2(a)(5), 2(a)(8) or 2(a)(11),
respectively, of the 1935 Act, (ii) a "public utility" under the Federal Power
Act, as amended, (iii) a "natural gas company" under the Natural Gas Act, as
amended, or (iv) a public utility or public service company (or similar
designation) by any state in the United States other than Massachusetts or by
any foreign country.

   Section 4.13 Vote Required. The approval of the Merger and the amendment to
the Company Declaration of Trust to permit a Massachusetts limited liability
company or any other company to merge into or consolidate with the Company by a
majority of the votes entitled to be cast by all holders of Company Common
Stock (the "Company Shareholders' Approval") is the only vote of the holders of
any class or series of the capital stock of the Company or any of its
subsidiaries required to approve this Agreement, the Merger and the other
transactions contemplated hereby.

   Section 4.14 Opinion of Financial Advisor. The Company has received the
opinion of Salomon Smith Barney to the effect that, as of November 3, 1999, the
Merger Consideration is fair from a financial point of view to the holders of
Company Common Stock.

   Section 4.15 Ownership of Parent Common Stock. Except as set forth in
Section 4.15 of the Company Disclosure Schedule, the Company does not
"beneficially own" (as such term is defined for purposes of Section 13(d) of
the Exchange Act) any shares of Parent Capital Stock.

   Section 4.16 Takeover Provisions; Rights Plans.

   (a) The Company has taken (and will take) all action required to be taken by
it in order to exempt this Agreement and the transactions contemplated hereby
from, and this Agreement and the transactions contemplated hereby are exempt
from, (i) the requirements of any "moratorium," "control share," "fair price"
or other anti-takeover laws and regulations (collectively, "Takeover Laws") of
The Commonwealth of Massachusetts, and (ii) the analogous provisions of the
Declaration.

   (b) The Company will take all action necessary so that the entering into of
this Agreement and the consummation of the transactions contemplated hereby
(including the Merger) do not and will not result in the ability of any person
to exercise any Rights under the Rights Agreements, dated as of February 22,
1990 and July 22, 1998, between the Company and BankBoston, N.A., as Rights
Agent, as amended (collectively, the "Company Rights Agreement") or enable or
require the Company Rights to separate from the shares of Company Common Stock
to which they are attached or to be triggered or become exercisable.


                                      A-12
<PAGE>

   (c) No "Distribution Date" or "Triggering Event" (as such terms are defined
in the Company Rights Plan) has occurred.

   Section 4.17 Year 2000. Except as set forth in Section 4.17 of the Company
Disclosure Schedule, (i) the Company has not been informed in writing by any
customer, vendor or service provider with which the Company or any of its
Subsidiaries transacts a material amount of business of an inability on the
part of such third party to be year 2000 compliant and (ii) 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 millennium 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 June 30, 1999.

                                   ARTICLE V

                    Representations and Warranties of Parent

   Parent represents and warrants to the Company as follows:

   Section 5.01 Organization and Qualification. Except as set forth in Section
5.01 of Parent Disclosure Schedule (as defined in Section 7.06(i)), Parent and
each of its subsidiaries is a corporation duly organized, validly existing and
in good standing under the laws of its jurisdiction of incorporation or
organization, has all requisite corporate power and authority, and has been
duly authorized by all necessary approvals and orders, to own, lease and
operate its assets and properties to the extent owned, leased and operated and
to carry on its business as it is now being conducted and is duly qualified and
in good standing to do business in each jurisdiction in which the nature of its
business or the ownership or leasing of its assets and properties makes such
qualification necessary, other than in such jurisdictions where the failure to
be so qualified and in good standing would not individually or in the aggregate
reasonably be expected to have a material adverse effect on the ability of
Parent to consummate the transactions contemplated by this Agreement or
materially delay consummation of such transactions (any such material adverse
effect being hereafter referred to as a "Parent Material Adverse Effect").

   Section 5.02 Authority; Non-Contravention; Statutory Approvals; Compliance.

   (a) Authority. Parent has all requisite corporate power and authority to
enter into this Agreement and, subject to the applicable Parent Required
Statutory Approvals (as defined in Section 5.04(c)), to consummate the
transactions contemplated hereby. The execution and delivery of this Agreement,
and the consummation by Parent of the transactions contemplated hereby have
been duly authorized by all necessary corporate action on the part of Parent.
This Agreement has been duly and validly executed and delivered by Parent and,
assuming the due authorization, execution and delivery by the other signatories
hereto, constitutes a valid and binding obligation of Parent enforceable
against it in accordance with its terms.

   (b) Non-Contravention. Except as set forth in Section 5.04(b) of Parent
Disclosure Schedule, the execution and delivery of this Agreement by Parent do
not, and the consummation of the transactions contemplated hereby will not,
result in a Violation pursuant to any provisions of (i) the articles of
incorporation, by-laws or similar governing documents of Parent or any of its
subsidiaries or any of its joint ventures, (ii) subject to obtaining Parent
Required Statutory Approvals (as defined in Section 5.04(c)) any statute, law,
ordinance, rule, regulation, judgment, decree, order, injunction, writ, permit
or license of any Governmental Authority applicable to Parent or any of its
subsidiaries or any of its joint ventures or any of

                                      A-13
<PAGE>

their respective properties or assets or (iii) subject to obtaining the third-
party consents or other approvals set forth in Section 5.04(b) of Parent
Disclosure Schedule (the "Parent Required Consents"), any note, bond, mortgage,
indenture, deed of trust, license, franchise, permit, concession, contract,
lease or other instrument, obligation or agreement of any kind to which Parent
or any of its subsidiaries or any of its joint ventures is a party or by which
it or any of its properties or assets may be bound or affected, excluding from
the foregoing clauses (ii) and (iii) such Violations as would not individually
or in the aggregate reasonably be expected to have a Parent Material Adverse
Effect.

   (c) Statutory Approvals. Except as described in Section 5.04(c) of Parent
Disclosure Schedule, 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 Merger
Sub or the consummation by Parent or Merger Sub of the transactions
contemplated hereby, the failure to obtain, make or give which would reasonably
be expected to have, individually or in the aggregate, 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, if any, as are necessary to avoid a violation of
law.

   (d) Compliance. Except as set forth in Section 5.04(d) or Section 5.11 of
Parent Disclosure Schedule, or as disclosed in Parent SEC Reports (as defined
in Section 5.05) filed prior to the date hereof, neither Parent nor any of its
subsidiaries nor (to the best of its knowledge) any of its joint ventures is in
violation of, or has been given notice of any purported violation of, any law,
statute, or order, rule, regulation or judgment (including, without limitation,
any applicable Environmental Law) of any Governmental Authority, except for
violations that are not individually or in the aggregate reasonably expected to
have, a Parent Material Adverse Effect. Except as set forth in Section 5.04(d)
of Parent Disclosure Schedule or in Section 5.11 of Parent Disclosure Schedule,
Parent and its subsidiaries and joint ventures have all permits, licenses,
franchises and other governmental authorizations, consents and approvals
necessary to conduct their respective businesses as currently conducted in all
respects, except those which the failure to obtain would not individually or in
the aggregate reasonably be expected to have a Parent Material Adverse Effect.
Except as set forth in Section 5.04(d) of Parent Disclosure Schedule, Parent
and each of its subsidiaries are not 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 under (i) its articles of organization or by-laws or (ii) any
material contract, commitment, agreement, indenture, mortgage, loan agreement,
note, lease, bond, license, approval or other instrument to which it is a party
or by which it is bound or to which any of its property is subject; except for
breaches, violations or defaults that are not individually or in the aggregate
reasonably expected to have, a Parent Material Adverse Effect.

   Section 5.03 Merger Sub. Merger Sub is a newly formed limited liability
company, and except for activities incident to the Merger and as contemplated
by this Agreement, Merger Sub: (i) has not engaged in any business activities
of any type or kind whatsoever; (ii) has not entered into any agreements or
arrangements with any person or entity; and (iii) is not subject to or bound by
any obligation or undertaking.

   Section 5.04 Proxy Statement. The information supplied or to be supplied by
or on behalf of Parent for inclusion or incorporation by reference in the Proxy
Statement will not, at the dates mailed to the Company shareholders and at the
time of the Company Special Meeting, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they are made, not misleading provided that no representation or warranty
is made by Parent with respect to the statements made or incorporated by
reference in the Proxy Statement based on information supplied by the Company
for inclusion or incorporation by reference therein. The Proxy Statement,
insofar as it relates to Parent or any Parent subsidiary, shall comply as to
form in all material respects with the applicable provisions of the Securities
Act and the Exchange Act and the rules and regulations thereunder.


                                      A-14
<PAGE>

   Section 5.05 Regulation as a Utility. Except as set forth in Section 5.09 of
Parent Disclosure Schedule, neither Parent nor any "subsidiary company" or
"affiliate" (as such terms are defined in the 1935 Act) of Parent is subject to
regulation as (i) a "holding company," a "public-utility company," a
"subsidiary company" or an "affiliate" of a "holding company," within the
meaning of sections 2(a)(7), 2(a)(5), 2(a)(8) or 2(a)(11), respectively, of the
1935 Act, (ii) a "public utility" under the Federal Power Act, (iii) a
"natural-gas company" under the Natural Gas Act, or (iv) a public utility or
public service company (or similar designation) by any state in the United
States other than New York or by any foreign country.

   Section 5.06 Financing. Parent has or will have available prior to the
Effective Time sufficient cash in immediately available funds to pay or to
cause Merger Sub to pay all Merger Consideration required to be paid pursuant
to Article II hereof and to consummate the Merger and the other transactions
contemplated hereby.

   Section 5.07 Ownership of Company Shares. Neither Parent nor any of its
subsidiaries or other affiliates beneficially owns any Company Shares.

                                   ARTICLE VI

                     Conduct of Business Pending the Merger

   Section 6.01 Covenants of the Parties. After the date hereof and prior to
the Effective Time or earlier termination of this Agreement, the Company agrees
as follows, as to itself and to each of its subsidiaries, except as expressly
contemplated or permitted in this Agreement or as set forth in Section 6.01 of
the Company Disclosure Schedule, or to the extent the Parent shall otherwise
consent in writing:

   (a) Ordinary Course of Business. The Company shall, and shall cause its
subsidiaries to, carry on their respective businesses in the ordinary course in
substantially the same manner as heretofore conducted and use all commercially
reasonable efforts to (i) preserve intact their present business organizations
and goodwill and preserve the goodwill and relationships with customers,
suppliers and others having business dealings with them, (ii) subject to
prudent management of workforce needs and ongoing programs currently in force,
keep available the services of their present officers and employees as a group,
and (iii) maintain and keep material properties and assets in as good repair
and condition as at present, subject to ordinary wear and tear, and maintain
supplies and inventories in quantities consistent with past practice.

   (b) Dividends. The Company shall not, nor shall it permit any of its
subsidiaries to: (i) declare or pay any dividends on or make other
distributions in respect of any capital stock other than (A) dividends by a
direct or indirect subsidiary to the Company or Parent, as the case may be or
(B) regular quarterly dividends on Company Common Stock that do not exceed the
current regular dividends on Company Common Stock; provided that, the Company
may from time to time after the first anniversary date of this Agreement
increase the rate of such dividends in an amount not more than $0.04 per year
on an annual basis and (C) if the Effective Time does not occur between a
record date and payment date of a regular quarterly dividend, a special
dividend on the Company Common Stock 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 the product of
(x) the number of days between the last payment date of a regularly quarterly
dividend on the Company Common Stock and the record date of such special
dividend, multiplied by (y) $.0047; (ii) split, combine, subdivide or
reclassify or take similar action with respect to any capital stock or the
capital stock of any subsidiary or issue or authorize or propose the issuance
of any other securities in respect of, in lieu of, or in substitution for,
shares of capital stock or the capital stock of any subsidiary; or (iii) adopt
a plan of 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 capital stock
or the capital stock of any subsidiary other than (A) redemptions, repurchases
and other acquisitions of shares of capital stock in connection with the
administration of employee benefit and dividend reinvestment plans as in effect
on the date

                                      A-15
<PAGE>

hereof in the ordinary course of the operation of such plans consistent with
past practice, or (B) intercompany acquisitions of capital stock.

   (c) Issuance of Securities. The Company shall not, nor shall it permit any
of its subsidiaries to, issue, agree to issue, deliver, sell, pledge, dispose
of or otherwise encumber any shares of their capital stock of any class or any
securities convertible into or exchangeable for, or any rights, warrants or
options to acquire, any such shares or convertible or exchangeable securities,
other than (i) pursuant to outstanding stock options granted under Employee
Benefit Plans, (ii) pursuant to the Company's employee stock purchase plan and
dividend reinvestment plan as in effect on the date hereof, (iii) in the case
of subsidiaries, for issuances of capital stock to the Company or another
subsidiary, or (iv) as may be required by the Company Rights Agreement.

   (d) Charter Documents; Other Actions. The Company shall not nor shall it
permit any of its subsidiaries to, amend or propose to amend its or its
subsidiaries' Declaration of Trust, articles of organization, by-laws or
regulations, or similar governing documents, or to take or fail to take any
other action, which in any such case would reasonably be expected to prevent or
materially impede or interfere with the Merger (except to the extent permitted
by Section 6.02 and Article IX).

   (e) Acquisitions. The Company shall not, nor shall it permit any of its
subsidiaries to, acquire or agree to acquire, by merging or consolidating with,
or by purchasing a substantial equity interest in or a substantial portion of
the assets of, or by any other manner, any business or any corporation,
partnership, association or business organization or division thereof, or
otherwise acquire or agree to acquire any material amount of assets other than
(i) in the ordinary course of business, and (ii) acquisitions having an
aggregate acquisition consideration payable by the Company of not more than
$5,000,000.

   (f) Capital Expenditures. Except (i) as may be required by law or (ii) as
reasonably deemed necessary by the Company following a catastrophic event, the
Company shall not, nor shall it permit any of its subsidiaries to, make capital
expenditures in excess of 110% of the aggregate annual amount budgeted by the
Company or its subsidiaries for capital expenditures as set forth in Section
6.01 of the Company Disclosure Schedule.

   (g) No Dispositions. The Company shall not, nor shall it permit any of its
subsidiaries to, sell, lease, or otherwise dispose of, any of its respective
assets, other than encumbrances or dispositions in the ordinary course of
business consistent with past practice.

   (h) Indebtedness. The Company shall not, nor shall it permit any of its
subsidiaries to, incur, or guarantee any indebtedness for borrowed money
(including any such debt 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 statement condition of another person other than (i) short-term and
other indebtedness and "keep well" or similar assurances for the benefit of
customers, in each case in the ordinary course of business consistent with past
practice; (ii) arrangements between the Company and its subsidiaries or among
its subsidiaries; or (iii) in connection with the refunding of existing
indebtedness at a lower cost of funds (calculating such cost on an aggregate
after-tax basis).

   (i) Compensation, Benefits. Except as may be required by applicable law, or
as expressly contemplated by this Agreement, the Company shall not, nor shall
it permit any of its subsidiaries to, (i) enter into, adopt, or amend any
Company Employee Benefit Plan or any arrangement that would be a Company
Employee Benefit Plan if it was in effect as of the date hereof to increase the
amount or accelerate the payment or vesting of any benefit or amount payable
thereunder, or otherwise increase the regular compensation, incentive
compensation opportunities, or benefits of any trustee, director, officer or
other employee of such party or any of its subsidiaries, except in accordance
with existing performance-based compensation arrangements (including, without
limitation, annual bonus opportunities under the Executive Incentive
Compensation Plan) in the ordinary course of business consistent with past
practice and except for normal increases in the ordinary course of business
consistent with past practice, or (ii) enter into or amend any employment,
severance or similar

                                      A-16
<PAGE>

contract, agreement or arrangement with any trustee, director or officer or
other employee other than in the ordinary course of business consistent with
current industry practice.

   (j) Accounting. The Company shall not, nor shall it permit any of its
subsidiaries to, make any changes in their accounting methods, except as
required by law, rule, regulation or GAAP.

   (k) Cooperation, Notification. The Company shall, and shall cause its
subsidiaries to, (i) confer on a regular and frequent basis with one or more
representatives of Parent to discuss, subject to applicable law, material
operational and business matters; (ii) promptly notify Parent of any
significant changes in its business, properties, assets, condition (financial
or other) or results of operations; (iii) advise Parent of any change or event
which has had or could reasonably be expected to result in a Company Material
Adverse Effect; and (iv) promptly provide Parent with copies of all filings
made by the Company or any of its subsidiaries with any state or federal court,
administrative agency, commission or other Governmental Authority in connection
with this Agreement and the transactions contemplated hereby; provided that the
Company shall not be required to make any disclosure to the extent such
disclosure would constitute a violation of the Confidentiality Agreement (as
defined below) or any applicable law or regulation. Parent shall advise the
Company of any change or event which has or could reasonably be expected to
result in a Parent Material Adverse Effect.

   (l) Rate Matters. The Company shall, and shall cause its subsidiaries, to
discuss with Parent any changes in its or its subsidiaries' regulated rates or
charges, standards of service or accounting from those in effect on the date
hereof and consult with Parent prior to making any filing (or any amendment
thereto), or effecting any agreement, commitment, arrangement, or consent with
governmental regulators, whether written or oral, formal or informal, with
respect thereto, and the Company and its subsidiaries shall not make any filing
to change its rates or charges on file with the public utility commission of
any state or FERC that would have, individually or in the aggregate, a material
adverse effect on the benefits associated with the Merger or a Company Material
Adverse Effect.

   (m) Contracts; Agreements. Neither the Company, nor any of its subsidiaries,
except in the ordinary course of business consistent with past practice, shall
modify, amend, terminate, renew or fail to use reasonable business efforts to
renew any material contract or agreement to which the Company or any subsidiary
of the Company is a party or waive, release, or assign any material rights or
claims. Neither the Company, nor any of its subsidiaries, shall agree in
writing to take any action not permitted by this Article VI.

   (n) Insurance. The Company shall, and shall cause its subsidiaries to,
maintain with financially responsible insurance companies insurance in such
amounts and against such risks and losses as are customary for companies
engaged in the gas utility and barge transportation industries.

   (o) Takeover Laws. The Company shall not take any action that would cause
the transactions contemplated by this Agreement to be subject to requirements
imposed by any Takeover Law, and shall take all necessary steps within its
control to exempt (or ensure the continued exemption of) the transactions
contemplated by this Agreement from any applicable Takeover Law.

   (p) Confidentiality Agreements. 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.

   (q) Rights Agreement. Except as specifically contemplated by this Agreement,
the Company shall not amend, modify or waive any provision of the Rights
Agreement, and shall not take any action to redeem the Company Rights or render
the Company Rights inapplicable to any transaction other than the transactions
to be effected pursuant to this Agreement.


                                      A-17
<PAGE>

   (r) EnergyNorth. The Company shall not terminate or amend the EnergyNorth
Agreement or waive any of its rights thereunder.

   (s) Conduct of Business of Merger Sub. 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 Merger Sub 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.

   (t) Parent shall not, and shall not permit its subsidiaries to, acquire or
agree to acquire a substantial portion of the assets of or equity in any
business or any corporation, partnership, association or other business
organization or division thereof if the entering into of a definitive agreement
relating to, or the consummation of, such acquisition, could reasonably be
expected to (i) impose any material delay in the obtaining of, or materially
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 or
(ii) materially adversely affect the ability of Parent to obtain financing
necessary to consummate the Merger.

   Section 6.02 Covenant of the Company; Alternative Proposals. From and after
the date hereof, the Company agrees (a) that it and its subsidiaries will not,
and it will not authorize or permit it and its subsidiaries' officers,
trustees, directors, employees, agents and representatives (including, without
limitation, any investment banker, attorney or accountant retained by it or any
of its subsidiaries or any of the foregoing) to, directly or indirectly,
encourage, initiate or solicit (including by way of furnishing information) or
take any action to facilitate any inquiries or the making of any proposal or
offer (including, without limitation, any proposal or offer to its
shareholders) which constitutes or may reasonably be expected to lead to an
Alternative Proposal (as defined below) from any person or engage in any
discussion or negotiations concerning an Alternative Proposal or accept any
Alternate Proposal; (b) that it will immediately cease and cause to be
terminated any existing solicitation, initiation, encouragement, activity,
discussions or negotiations with any parties conducted heretofore with a view
of formulating an Alternative Proposal; and (c) that it will immediately notify
Parent orally and in writing of the receipt of any such inquiry, offer or
proposals and the identity of the person making it within 24 hours of the
receipt thereof; shall keep Parent informed as to the status and details of any
such inquiry, offer or proposal; provided however, that notwithstanding any
other provision hereof, the Company may at any time prior to the time the
Company shareholders shall have voted with respect to the Merger (i) engage in
discussions or negotiations with a third party who, without solicitation,
initiation, encouragement, discussion or negotiation, directly or indirectly,
by or with the Company or its representatives after the date hereof, seeks to
initiate such discussions or negotiations and may furnish such third party
information concerning the Company and its business, properties and assets if,
and only to the extent that, (A)(x) the third party has first made a bona fide
written Alternative Proposal that, in the good faith judgment of a majority of
the Company's Board of Trustees, is likely to be more favorable to the
Company's shareholders than the Merger and as to which the Board of Trustees
has reasonably concluded that the third party will have adequate sources of
financing to consummate the Alternative Proposal, and (y) a majority of the
Company's Board of Trustees shall conclude in good faith, based upon the advice
of outside counsel and such other matters as the Company Board of Trustees
deems relevant, that such actions are necessary for the Company Board of
Trustees to comply with its fiduciary duties to shareholders under applicable
law, and (B) prior to furnishing such information to, or entering into
discussions or negotiations with, such person or entity, the Company (x)
provides prompt notice to Parent to the effect that it intends to furnish
information to, or intends to enter into discussions or negotiations with, such
person or entity, and of the identity of the person or group making the
Alternative Proposal and the material terms thereof and (y) receives from such
person an executed confidentiality agreement in reasonably customary form on
terms not in the aggregate more favorable to such third party than the terms
contained in the Confidentiality Agreement, (ii) comply with Rule 14e-2
promulgated under the Exchange Act with regard to a tender or exchange offer
provided, further, that the Board

                                      A-18
<PAGE>

of Trustees shall not recommend that the shareholders of the Company tender
their shares of Common Stock in connection with any such tender or exchange
offer unless a majority of the Board of Trustees shall have determined in good
faith based on the advice of outside counsel that such action is necessary for
the Company Board of Trustees to comply with its fiduciary duties to
shareholders under applicable law and/or (iii) accept an Alternative Proposal
from a third party, provided the Company terminates this Agreement pursuant to
Section 9.01(e) or (iv) in response to an unsolicited bona fide written
Alternative Proposal from a third party which is likely to be more favorable to
the Company's shareholders than the Merger and as to which the Company's Board
of Trustees has reasonably concluded that the third party will have adequate
sources of financing to consummate the Alternative Proposal recommend such
Alternative Proposal, or withdraw or modify in any adverse manner its approval
or recommendation of this Agreement if a majority of the Board of Trustees
shall have determined in good faith based on the advice of outside counsel that
such action is necessary for the Company Board of Trustees to comply with its
fiduciary duties to shareholders under applicable law. "Alternative Proposal"
shall mean a proposal or offer for a merger, acquisition, consolidation,
reorganization, share exchange, tender offer, exchange offer or similar
transaction involving the Company or any of the Company's significant
subsidiaries (as defined in Rule 1-02(w) of Regulation S-X under the Exchange
Act) or any proposal or offer to acquire in any manner, directly or indirectly
(x) ten percent or more of the outstanding Company Common Stock, (y) or 50% or
more of the outstanding capital stock of any significant subsidiary of the
Company, or (z) all or a substantial portion of the assets of the Company or of
any significant subsidiary. Nothing herein shall prohibit a disposition
permitted by Section 6.01 (g) hereof.

   Section 6.03 Control of Other Party's Business. 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 Parent shall exercise, consistent with
the terms and conditions of this Agreement, complete control and supervision
over its respective operations.

                                  ARTICLE VII

                             Additional Agreements

   Section 7.01 Access to Information. Upon reasonable notice and during normal
business hours, the Company shall, and shall cause its subsidiaries to, afford
to the officers, directors, employees, agents and accountants of the Parent
(collectively, "Representatives") reasonable access, throughout the period
prior to the Effective Time, to all of its properties, books, contracts,
commitments and records to the extent that such party or any of its
subsidiaries 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. During such period, the Company shall, and shall cause its
subsidiaries to, furnish promptly to the Parent (i) access to each report,
schedule and other document filed or received by it or any of its subsidiaries
pursuant to the requirements of federal or state securities laws or filed with
or sent to the SEC, the FERC, the Department of Justice, the Federal Trade
Commission or any other federal or state regulatory agency or commission, and
(ii) access to all information concerning themselves, their subsidiaries,
directors, officers and shareholders and such other matters as may be
reasonably requested by the Parent in connection with any filings, applications
or approvals required or contemplated by this Agreement. The Parent shall, and
shall cause its subsidiaries and Representatives to, hold in strict confidence
all Evaluation Material (as defined in the Confidentiality Agreement)
concerning the Company furnished to it in connection with the transactions
contemplated by this Agreement in accordance with the Confidentiality Agreement
between the Company (or its agent) and Parent, as it may be amended from time
to time (the "Confidentiality Agreement").

   Section 7.02 Proxy Statement.

   (a) Preparation and Filing. The Company will prepare and file with the SEC
as soon as reasonably practicable after the date hereof the Proxy Statement.
The Company shall use reasonable best efforts to have

                                      A-19
<PAGE>

the Proxy Statement cleared by the SEC as promptly as practicable after such
filing. 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 promptly notify Parent of the receipt of any comments of 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. 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 filing with, or
being sent to, the SEC. The information provided by any party hereto for use in
the Proxy Statement shall be true and correct in all material respects without
omission of any material fact which is required to make such information, in
the circumstances under which it is provided, not false or misleading. No
representation, covenant or agreement is made by or on behalf of any party
hereto with respect to information supplied by any other party for inclusion in
the Proxy Statement.

   (b) Each party shall promptly notify the other party of the receipt of any
comments of any of the SEC, the FERC, the Department of Justice, the Federal
Trade Commission or any other federal or state regulatory agency or commission
(the "Regulatory Filings") or requests for additional information and shall
promptly provide to the other party copies of all correspondence between such
party or any of its representatives and such regulatory agency or commission
with respect to the Regulatory Filings. Each party shall consult with the other
party regarding the Regulatory Filings and have due regard to any comments the
other party may make in relation to the Regulatory Filings. Each party shall
give the other party and its counsel the opportunity to review all responses to
requests for additional information by and replies to comments of any
regulatory agency or communication before their filing with, or being sent to,
such regulatory agency or commission.

   Section 7.03 Regulatory Matters. 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 no later
than the Initial Termination Date, as such date may be extended pursuant to
Section 9.01(b), all necessary permits, consents, approvals and authorizations
of all Governmental Authorities and all other persons necessary or advisable to
consummate the transactions contemplated by this Agreement, including, without
limitation, the Company Required Statutory Approvals and Parent Required
Statutory Approvals.

   Section 7.04 Shareholder Approval.

   (a) The Company Shareholders. The Company shall, as soon as reasonably
practicable after the date hereof, (i) take all steps necessary to duly call,
give notice of, convene and hold a meeting of its shareholders (the "Company
Special Meeting") for the purpose of securing the Company Shareholders'
Approval, (ii) distribute to its shareholders the Proxy Statement in accordance
with applicable federal and state law and with its Declaration, (iii) subject
to Section 6.02, recommend to its shareholders the approval of this Agreement
and the transactions contemplated hereby and (iv) cooperate and consult with
Parent with respect to each of the foregoing matters.

   Section 7.05 Trustees' and Officers' Indemnification.

   (a) Indemnification. From and after the Effective Time, Parent and the
Surviving Corporation shall, 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, an
officer, trustee, director or employee of the Company or any of its
subsidiaries (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 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 a subsidiary of the
Company

                                      A-20
<PAGE>

(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 the event of any such loss, expense, claim,
damage or liability (whether or not arising before the Effective Time), (i)
Parent shall pay the reasonable fees and expenses of counsel selected by the
Indemnified Parties, which counsel shall be reasonably satisfactory to Parent,
promptly after statements therefor are received and otherwise advance to such
Indemnified Party upon request reimbursement of documented expenses reasonably
incurred, in either case to the extent permitted by applicable law and (ii) any
determination required to be made with respect to whether an Indemnified
Party's conduct complies with the standards set forth in the applicable charter
document or by-laws or under applicable law shall be made by independent
counsel mutually acceptable to Parent and the Indemnified Party; provided,
however, that Parent shall not be liable for any settlement effected without
its written consent (which consent shall not be unreasonably withheld or
delayed). The Indemnified Parties as a group may retain only one law firm
(other than local counsel) with respect to each related matter except to the
extent there is, in the opinion of counsel to an Indemnified Party, under
applicable standards of professional conduct, a conflict on any significant
issue between positions of any two or more Indemnified Parties, in which case
each Indemnified Party with a conflicting position on a significant issue shall
be entitled to separate counsel.

   (b) Insurance. For a period of six years after the Effective Time, Parent
shall (i) cause to be maintained in effect policies of directors' and officers'
liability insurance for the benefit of those persons who are currently covered
by such policies of the Company on terms no less favorable than the terms of
such current insurance coverage; provided that the Parent may substitute
therefor policies of at least the same coverage containing terms that are no
less advantageous with respect to matters occurring at or prior to the
Effective Time to the extent such liability insurance can be maintained
annually at a cost to the Parent not greater than 200 percent of the current
annual premiums of the policies currently maintained by the Company for their
directors' and officers' liability insurance; provided further that if such
insurance cannot be so maintained or obtained at such cost, the Parent shall
maintain or obtain a policy providing the best coverage available, as
determined by the Board of Directors of the Parent, for a premium not exceeding
200 percent of the aggregate annual premiums currently paid by the Company for
their directors' and officers' liability insurance and other indemnity
agreements, or (ii) provide tail coverage for such persons which provides
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 Parent or any of its successors or assigns (i)
consolidates with or merges into any other person 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, then, and in either such case, proper provisions shall be made so that
the successors and assigns of Parent shall assume the obligations set forth in
this Section 7.05.

   (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, trustees, directors and officers of
the Company, and its subsidiaries with respect to their activities as such
prior to the Effective Time, as provided in its respective charter document and
by-laws 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 7.05 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.

   Section 7.06 Reasonable Best Efforts. Subject to the terms and conditions
provided herein, each of the parties hereto agrees to cooperate and use its
reasonable best efforts to take, or cause to be taken, all necessary or
appropriate action, and to do, or cause to be done, all things necessary, under
applicable laws, and regulations or otherwise to consummate and make effective
the Merger and all other transactions contemplated by this Agreement including,
without limitation, the execution of any additional instruments necessary to
consummate the transactions contemplated hereby and seeking to lift, rescind or
reverse any legal restraint imposed on the consummation of the transactions
contemplated by this Agreement. In case at any time after the

                                      A-21
<PAGE>

Effective Time any further action is necessary or desirable to carry out the
purposes of this Agreement, the proper officers and directors of each party
hereto shall take all such necessary action.

   Section 7.07 Disclosure Schedules. On the date hereof, (i) Parent has
delivered to the Company a schedule (the "Parent Disclosure Schedule"), signed
by a duly authorized officer stating that the Parent Disclosure Schedule is
being delivered pursuant to this clause 7.07(i), and (ii) the Company has
delivered to Parent a schedule (the "Company Disclosure Schedule"), signed by a
duly authorized officer stating that the Company Disclosure Schedule is being
delivered pursuant to this clause 7.07(ii). The Company Disclosure Schedule and
Parent Disclosure Schedule are collectively referred to herein as the
"Disclosure Schedules." The Disclosure Schedules constitute an integral part of
this Agreement and modify the respective representations, warranties, covenants
or agreements of the parties hereto contained herein to the extent that such
representations, warranties, covenants or agreements expressly refer to the
Disclosure Schedules. Anything to the contrary contained herein or in the
Disclosure Schedules notwithstanding, any and all statements, representations,
warranties or disclosures set forth in the Disclosure Schedules shall be deemed
to have been made on and as of the date hereof.

   Section 7.08 Public Announcements. Subject to each party's disclosure
obligations imposed by law or the rules of any applicable securities exchange
or Governmental Authority, the Company and Parent will cooperate with each
other in the development and distribution of all news releases and other public
information disclosures with respect to this Agreement or any of the
transactions contemplated hereby and shall not issue any public announcement or
statement with respect hereto without the prior consent of the other party
(which consent shall not be unreasonably withheld).

   Section 7.09 Employee Benefit Plans.

   (a) For a period of not less than twelve months immediately following the
Closing Date, Parent and the Surviving Corporation shall provide or cause to be
provided to those non-union individuals who continue to be employees of the
Surviving Corporation, Parent or their respective subsidiaries (the "Nonunion
Continuing Company Employees") and their family members, dependents and other
beneficiaries coverages and benefits not less favorable and on terms that are
not less favorable, in each case in the aggregate, than those provided or made
available to such Nonunion Continuing Company Employees immediately prior to
the Closing Date under the Company Employee Benefit Plans.

   (b) Parent and the Surviving Corporation shall give or cause to be given to
each Nonunion Continuing Company Employee 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, as applied to the employee benefit plans or arrangements
maintained by Parent, the Surviving Corporation, or their respective
subsidiaries in which such Nonunion Continuing Company Employee participates,
for such Nonunion Continuing Company Employees' service with the Company or any
subsidiary of the Company (or any prior employer) to the same extent recognized
by the analogous Company Employee Benefit Plan immediately prior to the Closing
Date and to the extent service with Parent or the Surviving Corporation is so
recognized for other employees of Parent or the Surviving Corporation who
participate in such plan.

   (c) Parent and the Surviving Corporation shall (i) waive or cause to be
waived all limitations as to preexisting conditions, exclusions and waiting
periods with respect to participation and coverage requirements applicable to
the Nonunion Continuing Company Employees and their family members and
dependents under the welfare benefit plans maintained or continued by Parent,
the Surviving Corporation or their respective subsidiaries, except to the
extent such limitations or waiting periods were already in effect with respect
to such Nonunion Continuing Company Employees and had not been satisfied as of
the Closing Date under the corresponding Company Employee Benefit Plan that is
a welfare plan maintained for the Nonunion Continuing Company Employees
immediately prior to the Closing Date, and (ii) provide or cause to be provided
to each Nonunion Continuing Company Employee credit for any co-payments and
deductibles paid during the year of but paid prior to the Closing Date in
satisfying any applicable deductible or out-of-pocket requirements under

                                      A-22
<PAGE>

the Company Employee Benefit Plans that are welfare plans in which such
Nonunion Continuing Company Employees are eligible to participate after the
Closing Date.

   (d) Subject to Sections 7.09 and 7.10, Parent and the Surviving Corporation
agree to honor and to cause their respective subsidiaries to honor, from and
after the Effective Time, in accordance with their terms, (i) all Company
Employee Benefit Plans, (ii) all collective bargaining agreements and (iii) all
other contracts, plans, arrangements or commitments with or for the benefit of
officers, trustees, directors or employees. Any workforce reductions affecting
employees of the Company carried out within the twenty-four- month period
following the Effective Time by Parent or the Surviving Corporation or their
respective subsidiaries shall be done in accordance with the provisions of this
Agreement, all applicable collective bargaining and other 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 applicable
state or local law.

   (e) The Company and Parent agree to coordinate their executive incentive
plans in order to assure that the officers and employees of the Company and its
subsidiaries entitled to participate in the Company's incentive pay or other
bonus plans receive on an equitable basis the benefits provided under such plan
for the portion of the year in which the Merger occurs during which they were
officers or employees of the Company or its subsidiaries.

   Section 7.10 Company Stock Options and Employee Benefits. As soon as
practicable following the date of this Agreement, the Board of Trustees of the
Company (or if appropriate, any committee administering the Company Stock
Option Plans) shall adopt such resolutions or take such other actions as may be
required to effect or facilitate the effectuation of the following:

   (a) In the case of each option outstanding immediately prior to the
Effective Time (including without limitation, for the avoidance of doubt,
options held by previously terminated employees that became exercisable in
connection with the Merger) to purchase shares of the Company Common Stock
under the Company Stock Option Plans (each a "Company Stock Option"), adjust
the terms of such Company Stock Option to provide that, at the Effective Time,
it shall (except to the extent that Parent and the holder of such Company Stock
Option otherwise agree in writing prior to the Effective Time): (i) if such
Company Stock Option is or becomes exercisable on or before the Merger or as a
consequence of the transactions contemplated by this Agreement and the holder
of such Company Stock Option shall have elected by written notice to Parent
prior to the date 10 business days prior to the Effective Time to receive the
payment contemplated by this clause (i), be canceled in exchange for a payment
from the Surviving Corporation (subject to any applicable withholding taxes)
equal to the product of (1) the total number of shares of Company Common Stock
subject to such Company Stock Option and (2) the excess of the Merger
Consideration over the exercise price per share of Company Common Stock subject
to such Company Stock Option, payable in cash as soon as reasonably practicable
following the Effective Time; or (ii) with respect to any Company Stock Option
not canceled pursuant to clause (i) above, be assumed by Parent and, thereby be
deemed to constitute an option to acquire, on the same terms and conditions as
were applicable under such Company Stock Option immediately prior to the
Effective Time, Parent Common Stock, except that (1) each such Company Stock
Option will be exercisable for that number of whole shares of Parent Common
Stock which equals (x) the number of shares of Company Common Stock subject to
such Company Stock Option immediately prior to the Effective Time multiplied by
(y) the Option Exchange Ratio (as defined below), rounded down to the nearest
whole number of shares of Parent Common Stock, and (2) the per share exercise
price for the shares of Parent Common Stock issuable upon exercise of such
assumed Company Stock Option will be equal to (x) the exercise price per share
of Company Common Stock under such Company Stock Option divided by (y) the
Option Exchange Ratio, rounded up to the nearest whole cent. The parties hereto
shall cooperate in giving the holders of Company Stock Options adequate notice
and opportunity to exercise their rights under this Section 7.10(a). With
respect to the Company Stock Options not canceled pursuant to clause (i) above,
Parent shall take all corporate action necessary to reserve for issuance a
sufficient number of shares of Parent Common Stock for delivery upon exercise
of options assumed by Parent pursuant to this Section. As soon as practicable
after the Effective Time,

                                      A-23
<PAGE>

Parent shall deliver to each holder of a Company Stock Option assumed by Parent
pursuant to this Section 7.10 an appropriate notice setting forth such holder's
rights pursuant thereto. For purposes of this provision, the term "Option
Exchange Ratio" shall mean the ratio obtained by dividing (i) the average of
the closing prices of the shares of Company Common Stock on the NYSE Composite
Transactions Reporting System, as reported in The Wall Street Journal, for the
twenty (20) trading days immediately preceding the second trading day prior to
the Effective Time by (ii) the average of the closing prices of the shares of
Parent Common Stock on the NYSE Composite Transactions Reporting System, as
reported in the Wall Street Journal for the twenty (20) trading days
immediately preceding the second trading day prior to the Effective Time.

   (b) It is intended that the Company Stock Options assumed by Parent shall
qualify following the Effective Time as incentive stock options as defined in
Section 422 of the Code to the extent the Company Stock Options qualified as
incentive stock options immediately prior to the Effective Time and the
provisions of this Section 7.10 shall be applied consistent with such intent,
including any adjustment of the conversion formula set forth in the preceding
paragraph (a) as is necessary in good faith to comply with Section 422 and
424(a) of the Code.

   (c) Except as otherwise agreed to in writing by the parties hereto, the
Company shall ensure that, to the extent consistent with applicable law
(including, without limitation, the Code), following the Effective Time, no
holder of a Company Stock Option nor any participant in any Company Stock
Option Plan or any other plan, program or arrangement providing for the
issuance or grant of any interest in respect of the capital stock of the
Company or any subsidiary shall have any right thereunder to acquire equity
securities of the Company or the Surviving Corporation.

   (d) Parent agrees to file a registration statement on Form S-8 for the
shares of Parent Common Stock issuable with respect to assumed Company Stock
Options as soon as reasonably practicable after the Effective Time and shall
use its reasonable efforts to maintain the effectiveness of such registration
statement thereafter for so long as any of such options or other rights remain
outstanding.

   Section 7.11 Expenses. All costs and expenses incurred in connection with
this Agreement and the transactions contemplated hereby shall be paid by the
party incurring such expenses, except that those expenses incurred in
connection with printing the Proxy/Registration Statement, as well as the
filing fee relating thereto, shall be shared equally by the Company and Parent.

   Section 7.12 Further Assurances. (a) Each of Parent and Company shall, and
shall cause its subsidiaries to, execute such further documents and instruments
and take such further actions as may reasonably be requested by the other in
order to consummate the Merger and the other transactions contemplated by this
Agreement, and to use its reasonable best efforts to take or cause to be taken
all actions, and to do or cause to be done all things necessary under
applicable laws, and regulations to consummate and make effective the Merger
and the other transactions contemplated hereby (subject to the vote of the
Company shareholders described in Sections 4.13), including fully cooperating
with the other in obtaining the Parent Required Statutory Approvals, the
Company Required Statutory Approvals and all other approvals and authorizations
of any Governmental Authorities necessary to consummate the transactions
contemplated hereby.

   (b) Parent and Company, respectively, shall be responsible for the taking of
any action necessary to obtain the Parent Required Statutory Approvals and to
obtain the Company Required Statutory Approvals. Parent and Company agree to
cooperate in obtaining the necessary approvals from the SEC under the 1935 Act,
the Securities Act and the Exchange Act from the applicable state authorities
under state "blue sky", securities or utility regulatory laws. Parent and
Company shall each provide the other with copies of any filings made with any
Governmental Authorities in connection with the foregoing.

   (c) It may be preferable to effectuate a business combination between Parent
and Company by means of an alternative structure in light of the conditions set
forth in Sections 8.01(d), 8.02(e) and 8.03(d). Accordingly, if the only
conditions to the parties' obligations to consummate the Merger that are not
satisfied or waived are receipt of any one or more of the Company Required
Consents, Company Required Statutory Approvals, Parent

                                      A-24
<PAGE>

Required Consents and Parent Required Statutory Approvals, and the adoption of
an alternative structure (that otherwise substantially preserves for Company
and Parent the economic benefits of the Merger and does not result in
materially more burdensome regulatory requirements) would result in such
conditions being satisfied or waived, then the parties shall cooperate 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, as applied to
such alternative business combination, shall have been satisfied or waived.

   Section 7.13 Corporate Offices. At and subsequent to the Effective Time, the
corporate headquarters of the Surviving Corporation shall be located in the
greater Boston, Massachusetts area.

   Section 7.14 Involvement in Community. After the Effective Time, Parent
will, or will cause the Surviving Corporation to make at least $1,000,000 per
year in charitable contributions to the communities served by the Surviving
Corporation and otherwise maintain a substantial level of involvement in
community activities in such communities that is similar to, or greater than,
the level of community development and related activities carried on by the
Company and is consistent with the activities and programs currently supported
by the Company.

   Section 7.15 Transition Steering Team. As soon as reasonably practicable
after the date hereof, Parent and the Company shall create a special transition
steering team, with representation from Parent and the Company, that will
develop recommendations concerning the future structure and operations of the
Company after the Effective Time, subject to applicable law. The members of the
transition steering team shall be appointed by the Chief Executive Officers of
Parent and the Company. The functions of the transition steering team shall
include (i) to direct the exchange of information and documents between the
parties and their subsidiaries as contemplated by Section 7.01 and (ii) the
development of regulatory plans and proposals, corporate organizational and
management plans, workforce combination proposals, and such other matters as
they deem appropriate.

   Section 7.16 Representation on Parent Board. The Parent shall take such
action as may be necessary to cause the number of directors comprising the
Parent's Board of Directors at the Effective Time to be sufficient to permit J.
Atwood Ives to serve thereon and shall elect Mr. Ives to serve as such
director.

                                  ARTICLE VIII

                                   Conditions

   Section 8.01 Conditions to Each Party's Obligation to Effect the Merger. The
respective obligations of each party to effect the Merger shall be subject to
the satisfaction or waiver on or prior to the Closing Date of each of the
following conditions:

   (a) Shareholder Approval. The Company Shareholders' Approval shall have been
obtained.

   (b) HSR Act. Any waiting period (and any extension thereof) applicable to
the consummation of the Merger under the Hart-Scott-Rodino Antitrust
Improvements Act of 1978, as amended, shall have expired or been terminated.

   (c) No Injunction. No temporary restraining order or preliminary or
permanent injunction or other order by any federal or state court preventing
consummation of the Merger shall have been issued and be continuing in effect,
and the Merger and the other transactions contemplated hereby shall not have
been prohibited under any applicable federal or state law or regulation.

                                      A-25
<PAGE>

   (d) Statutory Approvals. The Company Required Statutory Approvals and Parent
Required Statutory Approvals shall have been obtained at or prior to the
Effective Time, such approvals shall have become Final Orders (as defined
below) and such Final Orders shall not impose terms or conditions that, in the
case of the State of New Hampshire approval, constitute a Company Material
Adverse Effect and in the case of the 1935 Act approval, are materially adverse
to the business, properties, financial condition or results of operations of
Parent and its subsidiaries taken as a whole (a "Parent MAE"). A "Final Order"
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 transactions contemplated hereby
may be consummated has expired, and as to which all conditions to the
consummation of such transactions prescribed by law, regulation or order have
been satisfied. For purposes of this Agreement, in the event that any Final
Order includes terms or conditions that (i) require that Parent register as a
"holding company" under the 1935 Act or (ii) require (whether on an absolute or
contingent basis) that, at any time, all or any portion of Midland Enterprises
Inc. or any of its subsidiaries, assets, operations or business be transferred,
sold, spun off or distributed (whether in whole or in part) to shareholders,
otherwise disposed of, liquidated or wound down, such terms and conditions
shall be deemed not to constitute a Parent MAE or Company Material Adverse
Effect.

   Section 8.02 Conditions to Obligation of Parent to Effect the Merger. The
obligation of Parent to effect the Merger shall be further subject to the
satisfaction (or waiver by Parent), on or prior to the Closing Date, of each of
the following conditions:

   (a) Performance of Obligations of the Company. The Company shall have
performed in all material respects each of its agreements and covenants
required by this Agreement to be so performed by the Company at or prior to the
Closing.

   (b) Representations and Warranties. The representations and warranties of
the Company set forth in this Agreement (other than the representations
contained in Sections 4.03, 4.04(a), 4.13 and 4.16) shall be true and correct
on and as of the Closing Date with the same effect as though such
representations and warranties had been made on and as of the Closing Date
(except for representations and warranties that expressly speak only as of a
specific date or time, which need only be true and correct as of such date or
time) except for such failures of representations or warranties to be true and
correct which would not reasonably be expected to result in a Company Material
Adverse Effect and the representations contained in Sections 4.03, 4.04(a),
4.13 and 4.16 shall be true and correct in all material respects

   (c) Closing Certificates. Parent shall have received a certificate signed by
the Chief Executive Officer or Chief Financial Officer of the Company, dated
the Closing Date, to the effect that, to the best of such officer's knowledge,
the conditions set forth in Section 8.02(a) and Section 8.02(b) have been
satisfied.

   (d) No Company Material Adverse Effect. There shall exist no fact or
circumstance other than facts and circumstances described in Section 8.02(d) of
the Company Disclosure Schedule or the Company SEC Reports filed prior to the
date hereof that constitutes a Company Material Adverse Effect.

   (e) Company Required Consents. The Company Required Consents the failure of
which to obtain would reasonably be expected to have a Company Material Adverse
Effect shall have been obtained.

   (f) EnergyNorth Transaction. The Company's acquisition of EnergyNorth shall
have been, or shall simultaneously be, consummated or the Company shall have
terminated the EnergyNorth Agreement.

   Section 8.03 Conditions to Obligation of the Company to Effect the
Merger. The obligation of the Company to effect the Merger shall be further
subject to the satisfaction (or waiver by the Company), on or prior to the
Closing Date, of each of the following conditions:

   (a) Performance of Obligations of Parent. Parent shall have performed in all
material respects each of its agreements and covenants required by this
Agreement to be so performed by Parent at or prior to the Closing.

                                      A-26
<PAGE>

   (b) Representations and Warranties. The representations and warranties of
Parent set forth in this Agreement shall be true and correct on and as of the
Closing Date with the same effect as though such representations and warranties
had been made on and as of the Closing Date (except for representations and
warranties that expressly speak only as of a specific date or time, which need
only be true and correct as of such date or time) except for such failures of
representations or warranties to be true and correct which would not reasonably
be expected to result in a Parent Material Adverse Effect.

   (c) Closing Certificates. The Company shall have received a certificate
signed by the chief Executive Officer or Chief Financial Officer of Parent,
dated the Closing Date, to the effect that, to the best of such officer's
knowledge, the conditions set forth in Section 8.03(a) and Section 8.03(b) have
been satisfied.

   (d) Parent Required Consents. Parent Required Consents the failure of which
to obtain would reasonably be expected to have a Parent Material Adverse Effect
shall have been obtained.

                                   ARTICLE IX

                       Termination, Amendment and Waiver

   Section 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 before or after approval by the shareholders of
the respective parties hereto contemplated by this Agreement:

   (a) by mutual written consent of the Board of Trustees of the Company and
the Board of Directors of Parent;

   (b) by Parent or the Company, by written notice to the other parties, if the
Effective Time shall not have occurred on or before March 31, 2001 (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 directly or indirectly in, the failure of the Effective Time to
occur on or before such date; and provided, further, that if on the Initial
Termination Date the conditions to the Closing set forth in Section 8.01(d)
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 to September 30, 2001;

   (c) (i) by Parent, by written notice to the other parties, if the Company
Shareholders' Approval shall not have been obtained on or before June 30, 2000
at a duly held Company Special Meeting, including any adjournments thereof;

   (d) by Parent or the Company, if any state or federal law, order, rule or
regulation is adopted or issued, which has the effect, as supported by the
written opinion of outside counsel for such party, of prohibiting the
Incorporation Merger or the Merger, or if any court of competent jurisdiction
in the United States or any State shall have issued an order, judgment or
decree permanently restraining, enjoining or otherwise prohibiting the
Incorporation Merger or the Merger, and such order, judgment or decree shall
have become final and nonappealable; (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 five days prior notice to Parent if as a result of
a bona fide written Alternative Proposal by a party other than Parent or any of
its affiliates, a majority of the Board of Trustees of the Company determines
in good faith that (x) such proposal is more favorable to the shareholders of
the Company than the Merger and as to which the Company's Board of Trustees has
reasonably determined that the third party has adequate sources of financing to
consummate the Alternative Proposal and (y) on the basis of advice

                                      A-27
<PAGE>

of outside counsel that the termination of this Agreement is necessary to
comply with its fiduciary duties under applicable law; provided, however, that
(i) the Board of Trustees of the Company shall have been advised by outside
counsel that, notwithstanding a binding commitment to consummate an agreement
of the nature of this Agreement entered into in the proper exercise of their
applicable fiduciary duties, and notwithstanding all concessions that may be
offered by Parent in negotiations entered into pursuant to clause (ii) below,
such fiduciary duties would also require the directors to reconsider such
commitment as a result of such Alternative Proposal and (ii) prior to any such
termination, the Company shall, and shall cause its financial and legal
advisors to, negotiate with Parent during such five-day notice period to make
such adjustments in the terms and conditions of this Agreement as would enable
the Company to proceed with the transactions contemplated herein 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 to it pursuant to Sections 9.03(a) and 9.03(b).

   (f) by the Company, by written notice to Parent, if (i) there exist breaches
of the representations and warranties of Parent made herein as of the date
hereof which breaches, would or would reasonably be expected to result in a
Parent Material Adverse Effect, and such breaches shall not have been remedied
within 20 days after receipt by Parent of notice in writing from the Company,
specifying the nature of such breaches and requesting that they be remedied, or
(ii) there shall have been a material breach of any agreement or covenant of
Parent hereunder, and such breach shall not have been remedied within 20 days
after receipt by Parent of notice in writing from the Company, specifying the
nature of such failure and requesting that it be remedied; or

   (g) by Parent, by written notice to the Company, if

     (i) there exist breaches of the representations and warranties of the
  Company (other than the representations contained in Sections 4.03,
  4.04(a), 4.13 and 4.16) made herein as of the date hereof which breaches,
  would or would reasonably be expected to result in a Company Material
  Adverse Effect or there exist material breaches of the representations of
  the Company contained in Sections 4.03, 4.04(a), 4.13 and 4.16, and such
  breaches shall not have been remedied within 20 days after receipt by the
  Company of notice in writing from Parent, specifying the nature of such
  breaches and requesting that they be remedied;

     (ii) there shall have been a material breach of any agreement or
  covenant of the Company hereunder, and such failure to perform or comply
  shall not have been remedied within 20 days after receipt by the Company of
  notice in writing from Parent, specifying the nature of such failure and
  requesting that it be remedied; or

     (iii) the Board of Trustees of the Company or any committee thereof (A)
  shall withdraw or modify in any manner adverse to Parent its approval or
  recommendation of this Agreement or the transactions contemplated herein,
  (B) shall fail to reaffirm such approval or recommendation upon Parent's
  request, (C) shall approve or recommend or take no position with respect to
  an Alternative Proposal or (D) shall resolve to take any of the actions
  specified in clause (A), (B) or (C).

   Section 9.02 Effect of Termination. In the event of a valid termination of
this Agreement 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
on the part of either the Company or Parent or their respective officers,
trustees or directors hereunder, except that Section 7.11, Section 9.03, the
agreement contained in the last sentence of Section 7.01, Section 10.08 and
Section 10.09 shall survive the termination.

   Section 9.03 Termination Fee; Expenses.

   (a) In the event that this Agreement is terminated by the Company pursuant
to Section 9.01(e) or by the Parent pursuant to any of Section 9.01(c), Section
9.01(g)(i), Section 9.01(g)(ii) or Section 9.01(g)(iii), then the Company shall
promptly (but no later than five business days after notice that the amount is
due from the Company) pay to the Parent, as liquidated damages, an amount in
cash equal to the out-of-pocket expenses and fees incurred by the Parent
arising out of, in connection with or related to the Merger and the other
transactions

                                      A-28
<PAGE>

contemplated by this Agreement not in excess of $10 million ("Out-of-Pocket
Expenses"); provided that if this Agreement is terminated by a party as a
result of a willful breach of a representation, warranty, covenant or agreement
by the Company, the Parent may pursue any remedies available to it at law or in
equity and shall, in addition to the amount of Out-of-Pocket Expenses set forth
above, be entitled to recover such additional amounts as the Parent may be
entitled to receive at law or in equity.

   (b) In the event that (i) this Agreement is terminated by the Company
pursuant to Section 9.01 (e) or by the Parent pursuant to Section 9.01(g)(iii)
or (ii) any person or group shall have made an Alternative Proposal and this
Agreement is terminated by (A) Parent pursuant to Section 9.01 (c) or Section
9.01 (g)(i) or 9.01(g)(ii) or (B) 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 one year after such
termination, or the Company or any of its affiliates becomes a subsidiary of
such offeror or a subsidiary of an affiliate of such offeror or accepts a
written offer or consummates an Alternative Proposal with such offeror or an
affiliate thereof, then the Company, upon the signing of a definitive agreement
relating to such Alternative Proposal, or if no such agreement is signed, then
at the closing (and as a condition to the closing) of the Company becoming such
a subsidiary or of such Alternative Proposal, shall pay to Parent, by wire
transfer of same day funds, a termination fee of $65 million, plus Out-of-
Pocket Expenses.

   (c) 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 Section 9.03(a), 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 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, 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 Section
9.03(a), 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 Fleet
Bank from the date such fee was required to be paid.

   Section 9.04 Amendment. This Agreement may be amended by the Boards of
Trustees or Directors, as the case may be, of the parties hereto, at any time
before or after approval hereof by the shareholders of the Company and prior to
the Effective Time, but after such approval only to the extent permitted by
applicable law. This Agreement may not be amended except by an instrument in
writing signed on behalf of each of the parties hereto.

   Section 9.05 Waiver. At any time prior to the Effective Time, the Parent or
the Company may (a) extend the time for the performance of any of the
obligations or other acts of the other parties hereto, (b) waive any
inaccuracies in the representations and warranties contained herein or in any
document delivered pursuant hereto and (c) waive compliance with any of the
agreements or conditions contained herein, to the extent permitted by
applicable law. Any agreement on the part of a party hereto to any such
extension or waiver shall be valid if set forth in an instrument in writing
signed on behalf of such party. 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.

                                      A-29
<PAGE>

                                   ARTICLE X

                               General Provisions

   Section 10.01 Non-Survival; Effect of Representations and Warranties. All
representations, warranties and agreements in this Agreement shall not survive
the Merger, except as otherwise provided in this Agreement and except for the
agreements contained in this Section 10.01, in Articles I and II and in
Sections 7.05, 7.09, 7.10, 7.11, 7.13, 7.14, 7.15, 7.16, 10.07, 10.08, 10.09
and 10.10.

   Section 10.02 Brokers. The Company represents and warrants that, except for
Salomon Smith Barney, no broker, finder or investment banker is entitled to any
brokerage, finder's or other fee or commission in connection with the Merger or
the transactions contemplated by this Agreement based upon arrangements made by
or on behalf of the Company. Parent represents and warrants that, except for
J.P. Morgan Securities, Inc., no broker, finder or investment banker is
entitled to any brokerage, finder's or other fee or commission in connection
with the Merger or the transactions contemplated by this Agreement based upon
arrangements made by or on behalf of Parent.

   Section 10.03 Notices. All notices and other communications hereunder shall
be in writing and shall be deemed given if (i) delivered personally, (ii) sent
by reputable overnight courier service, (iii) telecopied (which is confirmed),
or (iv) five days after being mailed by registered or certified mail (return
receipt requested) to the parties at the following addresses (or at such other
address for a party as shall be specified by like notice):

   (a) If to the Company, to:

     J. Atwood Ives
     Chairman and Chief Executive Officer
     Eastern Enterprises
     9 Riverside Road
     Weston, Massachusetts 02493
     Telephone: (781) 647-2300
     Telecopy: (781) 674-2350

     with a copy to:

     L W. Law, Jr.
     Senior Vice President and General Counsel
     Eastern Enterprises
     9 Riverside Drive
     Weston, Massachusetts 02493
     Telephone: (781) 647-2313
     Telecopy: (781) 674-2398

   (b) If to Parent, to:

     Frederick Lowther, Esq.
     KeySpan Corporation
     One Metrotech Center
     Brooklyn, New York 11201-3851
     Telephone: (718) 403-3313
     Telecopy: (718) 522-2647

                                      A-30
<PAGE>

     with a copy to:

     James M. Cotter, Esq.
     Simpson Thacher & Bartlett
     425 Lexington Avenue
     New York, New York 10017
     Telephone: (212) 455-2000
     Telecopy: (212) 455-2502

   Section 10.04 Miscellaneous. This Agreement (including the documents and
instruments referred to herein) (i) constitutes the entire agreement and
supersedes all other prior agreements and understandings, both written and
oral, among the parties, or any of them, with respect to the subject matter
hereof other than the Confidentiality Agreement; (ii) shall not be assigned by
operation of law or otherwise; and (iii) shall be governed by and construed in
accordance with the laws of The Commonwealth of Massachusetts applicable to
contracts executed in and to be fully performed in such State, without giving
effect to its conflicts of law, rules or principles.

   Section 10.05 Interpretation; Knowledge. When a reference is made in this
Agreement to Sections or Exhibits, such reference shall be to a Section or
Exhibit of this Agreement, respectively, unless otherwise indicated. The table
of contents and headings contained in this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement. Whenever the words "include," "includes" or "including" are used in
this Agreement, they shall be deemed to be followed by the words "without
limitation." References in this Agreement to the "knowledge of the Company" or
any similar expression shall refer to and mean the actual knowledge of an
executive officer of the Company.

   Section 10.06 Counterparts; Effect. This Agreement may be executed in one or
more counterparts, each of which shall be deemed to be an original, but all of
which shall constitute one and the same agreement.

   Section 10.07 Parties in Interest. This Agreement shall be binding upon and
inure solely to the benefit of each party hereto, and, except for Article II
and for rights of Indemnified Parties as set forth in Section 7.05, nothing in
this Agreement, express or implied, is intended to confer upon any other person
any rights or remedies of any nature whatsoever under or by reason of this
Agreement.

   Section 10.08 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 HEREBY (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.

   Section 10.09 Enforcement. The parties agree that irreparable damage would
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were 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 of this Agreement in any court of the United States
located in The Commonwealth of Massachusetts or in Massachusetts state court,
this being in addition to any other remedy to which they are entitled at law or
in equity. In addition, each of the parties hereto (a) consents to submit
itself to the personal jurisdiction of any federal court located in The
Commonwealth of Massachusetts or any Massachusetts state court in the event any
dispute arises out of this Agreement or any of the transactions contemplated by
this Agreement, (b) agrees that it will not attempt to

                                      A-31
<PAGE>

deny such personal jurisdiction by motion or other request for leave from any
such court and (c) agrees that it will not bring any action relating to this
Agreement or any of the transactions contemplated by this Agreement in any
court other than a federal or state court sitting in The Commonwealth of
Massachusetts.

   Section 10.10 Reference is hereby made to the declaration of trust
establishing Eastern Enterprises (formerly Eastern Gas and Fuel Associates)
dated July 18, 1929, as amended, a copy of which is on file in the office of
the Secretary of the Commonwealth of Massachusetts. The name "Eastern
Enterprises" refers to the trustees under said declaration as trustees and not
personally; and no trustee shareholder, officer or agent of Eastern Enterprises
shall be held to any personal liability in connection with the affairs of said
Eastern Enterprises, but the trust estate only is liable.

                                      A-32
<PAGE>

   IN WITNESS WHEREOF, the Company, Parent and Merger Sub have caused this
Agreement to be signed by their respective officers thereunto duly authorized
as of the date first written above.

                                          Eastern Enterprises,

                                          By: /s/ J. Atwood Ives
                                             ----------------------------------
                                            Title: Chairman and Chief
                                            Executive Officer

                                          KeySpan Corporation

                                          By: /s/ Robert B. Catell
                                             ----------------------------------
                                            Title: Chairman and Chief
                                            Executive Officer

                                          ACJ Acquisition LLC

                                          By: /s/ Steven Zelkowitz
                                             ----------------------------------
                                            Title: Manager

                                      A-33
<PAGE>

                                                                      APPENDIX B
[LOGO OF SALOMON SMITH BARNEY


November 3, 1999

Board of Trustees
Eastern Enterprises
9 Riverside Road
Weston, MA 02493

Ladies and Gentlemen:

   You have requested our opinion as investment bankers as to the fairness,
from a financial point of view, to the holders of common stock, par value $1.00
per share ("Company Common Stock"), of Eastern Enterprises (the "Company"), a
Massachusetts voluntary association, of the consideration to be received by
such holders in connection with the proposed merger (the "Merger") of ACJ
Acquisition LLC ("Merger Sub"), a Massachusetts limited liability company and a
wholly owned subsidiary of KeySpan Corporation ("Parent"), a New York
corporation, with and into the Company, pursuant to the Agreement and Plan of
Merger (the "Agreement") to be entered into by and among the Company, Parent
and Merger Sub.

   As more specifically set forth in the Agreement, and subject to the terms
and conditions thereof, Merger Sub will merge with and into the Company and
each issued and outstanding share of Company Common Stock (other than shares
owned by the Company, Parent, Merger Sub or any other wholly-owned subsidiary
of Parent and other than Dissenting Shares (as defined and described in the
Agreement)) will be converted into the right to receive $64.00 in cash (the
"Per Share Amount"), subject to adjustment as set forth in the following
sentence (the "Merger Consideration"). In the event that the Effective Time (as
defined in the Agreement) shall not have occurred on or prior to the later of
(i) the date that is nine months after the date of the Agreement or (ii) the
date that is ninety days after the date on which the State of New Hampshire
statutory approvals shall have been obtained and become Final Orders (as
defined in the Agreement) (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 (as defined in the Agreement),
by an amount equal to $0.006 per share (subject to adjustment in accordance
with the terms of the Agreement).

   In connection with rendering our opinion, we have reviewed and analyzed,
among other things, the following; (i) a copy of a draft dated November 3,
1999, of the Agreement; (ii) certain publicly available information concerning
the Company, including the Annual Reports on Form 10-K of the Company for each
of the years in the three year period ended December 31, 1998; (iii) certain
internal information, primarily financial in nature, including projections,
concerning the business and operations of the Company, furnished to us by the
Company for purposes of our analysis; (iv) certain publicly available
information concerning the trading of, and the trading market for, Company
Common Stock; (v) certain publicly available information with respect to
certain other companies that we believe to be relevant to our inquiry and the
trading markets for certain of such other companies' securities; and (vi)
certain publicly available information concerning the nature and terms of
certain other transactions that we consider relevant to our inquiry. We also
have considered such other information, financial studies, analyses,
investigations and financial, economic and market criteria that we deemed
relevant. We also have met with certain officers and employees of the Company
to discuss the foregoing as well as other matters that we believe relevant to
our inquiry.

   In our review and analysis and in arriving at our opinion, we have assumed
and relied upon the accuracy and completeness of all of the financial and other
information provided to us or publicly available and have neither attempted
independently to verify nor assumed any responsibilities for verifying any of
such information and have further relied upon the assurances of management of
the Company that they are not aware of any facts that would make any of such
information inaccurate or misleading. We have not conducted a

                                      B-1
<PAGE>

physical inspection of any of the properties or facilities of the Company, nor
have we made or obtained or assumed any responsibility for making or obtaining
any independent evaluations or appraisals of any of such properties or
facilities, nor have we been furnished with any valuations or appraisals. With
respect to financial projections, we have been advised by the management of the
Company and have assumed that they were reasonably prepared and reflect the
best currently available estimates and judgment of the management of the
Company as to the future financial performance of the Company and we express no
view with respect to such projections or the assumptions on which they were
based. We also have assumed that the Merger will be consummated in a timely
manner and in accordance with the terms of the Agreement.

   In conducting our analysis and arriving at our opinion as expresses herein,
we have considered such financial and other factors as we have deemed
appropriate under the circumstances. We have also taken into account our
assessment of general economic, market and financial conditions as well as our
experience in connection with similar transactions and securities valuation
generally. In arriving at our opinion, we have not ascribed a specific
consolidated range of values to the Company. We have not been asked to
consider, and our opinion does not address, the relative merits of the Merger
as compared to any alternative business strategy that might exist for the
Company. Our opinion necessarily is based upon conditions as they exist and can
be evaluated on the date hereof, and we assume no responsibility to update or
revise our opinion based upon circumstances or events occurring after the date
hereof. Our opinion is, in any event, limited to the fairness, from a financial
point of view, of the Merger Consideration to the holders of Company Common
Stock and does not address the Company's underlying business decision to effect
the Merger or constitute a recommendation of the Merger to the Company.

   We have acted as financial advisors to the Company in connection with the
Merger and will receive a fee for such services, a substantial portion of which
is contingent upon consummation of the Merger. In addition, in the ordinary
course of business, we and our affiliates may actively trade the securities of
the Company and Parent 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. We and our affiliates (including Citigroup Inc.) may have other
business relationships with the Company or Parent. We also acted as financial
advisors to EnergyNorth, Inc. in connection with the business combination
transaction entered into by EnergyNorth, Inc. and the Company pursuant to the
Agreement and Plan of Reorganization dated as of July 14, 1999, by and among
the Company, EE Acquisition Company, Inc. and EnergyNorth, Inc.

   This opinion is intended solely for the benefit and use of the Company
(including the management and trustees of the Company) in considering the
transaction to which it relates and may not be used for any other purposes or
reproduced, disseminated, quoted or referred to (other than in the Agreement)
at any time, in any manner or for any purpose, without the prior written
consent of Salomon Smith Barney, except that this opinion may be reproduced in
full in, and references to this opinion and to Salomon Smith Barney and its
relationship with the Company (in each case in such form as Salomon Smith
Barney shall approve) may be included in, the proxy statement the Company
distributes to its shareholders in connection with the Merger.

   Based upon and subject to the foregoing, it is our opinion as investment
bankers that as of the date hereof, the Merger Consideration is fair, from a
financial point of view, to the holders of Company Common Stock.

                                          Very truly yours,

                                          /s/ Salomon Smith Barney Inc.

                                          SALOMON SMITH BARNEY INC.

                                      B-2
<PAGE>

                                                                      APPENDIX C

                         GENERAL LAWS OF MASSACHUSETTS
                         SECTIONS 85-98 OF CHAPTER 156B

Section 85. Dissenting stockholder; right to demand payment for stock;
exception

   A stockholder in any corporation organized under the laws of Massachusetts
which shall have duly voted to consolidate or merge with another corporation or
corporations under the provisions of sections seventy-eight or seventy-nine who
objects to such consolidation or merger may demand payment for his stock from
the resulting or surviving corporation and an appraisal in accordance with the
provisions of sections eighty-six to ninety-eight, inclusive, and such
stockholder and the resulting or surviving corporation shall have the rights
and duties and follow the procedure set forth in those sections. This section
shall not apply to the holders of any shares of stock of a constituent
corporation surviving a merger if, as permitted by subsection (c) of section
seventy-eight, the merger did not require for its approval a vote of the
stockholders of the surviving corporation.

Section 86. Sections applicable to appraisal; prerequisites

   If a corporation proposes to take a corporate action as to which any section
of this chapter provides that a stockholder who objects to such action shall
have the right to demand payment for his shares and an appraisal thereof,
sections eighty-seven to ninety-eight, inclusive, shall apply except as
otherwise specifically provided in any section of this chapter. Except as
provided in sections eighty-two and eighty-three, no stockholder shall have
such right unless (1) he files with the corporation before the taking of the
vote of the shareholders on such corporate action, written objection to the
proposed action stating that he intends to demand payment for his shares if the
action is taken and (2) his shares are not voted in favor of the proposed
action.

Section 87. Statement of rights of objecting stockholders 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."

Section 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 a 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

                                      C-1
<PAGE>

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.

Section 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 eighty-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.

Section 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.

Section 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.

Section 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.


                                      C-2
<PAGE>

Section 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.

Section 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 the 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.

Section 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.

Section 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.

Section 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.

Section 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.

                                      C-3
<PAGE>

                                                                      APPENDIX D

                  AMENDMENT TO EASTERN'S DECLARATION OF TRUST

Existing Section 38

   Section 38. Voluntary Termination or Amendment of Trust. The Trustees may
terminate this trust at any time, or may cause this trust to be merged into or
consolidated with another company under or pursuant to any state or federal
statute, if such termination, merger or consolidation has been authorized by
vote of at least a majority of the outstanding Common Stock; provided that in
the case of such statutory merger or consolidation, the agreement of merger or
consolidation shall (subject to the last sentence of the next to the last
paragraph of Article 40) confer on the holders of all shares of this trust who
dissent from such merger within the time and in the manner provided in the
Massachusetts statute applicable to business corporations, substantially those
rights they would have if this trust were at the time a Massachusetts business
corporation; and provided further that in other respects the Trustees shall
have power to prescribe the procedure necessary or appropriate to accomplish
such merger or consolidation in conformity with the provisions of the
applicable statute.

   Except in instances in which this Declaration requires a higher percentage
the terms of this Declaration may be amended in any particular whatsoever or
added to or rescinded by vote of at least a majority of the outstanding Common
Stock; provided (a) no change shall be made in Article 19 which will impair the
relief from personal liability provided therein, (b) any provision requiring a
higher percentage than a majority shall be amended only by such higher
percentage and (c) this Declaration may be amended for the purpose of changing
the name of this trust, or of supplying any omission, curing any ambiguity or
curing, correcting or supplementing any defective or inconsistent provision
contained in this Declaration, by the Trustees without authorization by
shareholder vote.

Section 38, as amended

   Section 38. Voluntary Termination or Amendment of Trust. The Trustees may
terminate this trust at any time, or may cause this trust to be merged into or
consolidated with another company or may cause or permit a Massachusetts
limited liability company or any other company to merge into or consolidate
with this trust under or pursuant to any state or federal statute, if such
termination, merger or consolidation has been authorized by vote of at least a
majority of the outstanding Common Stock; provided that in the case of such
statutory merger or consolidation, the agreement of merger or consolidation
shall (subject to the last sentence of the next to the last paragraph of
Article 40) confer on the holders of all shares of this trust who dissent from
such merger within the time and in the manner provided in the Massachusetts
statute applicable to business corporations, substantially those rights they
would have if this trust were at the time a Massachusetts business corporation;
and provided further that in other respects the Trustees shall have power to
prescribe the procedure necessary or appropriate to accomplish such merger or
consolidation in conformity with the provisions of the applicable statute.

   Except in instances in which this Declaration requires a higher percentage
the terms of this Declaration may be amended in any particular whatsoever or
added to or rescinded by vote of at least a majority of the outstanding Common
Stock; provided (a) no change shall be made in Article 19 which will impair the
relief from personal liability provided therein, (b) any provision requiring a
higher percentage than a majority shall be amended only by such higher
percentage and (c) this Declaration may be amended for the purpose of changing
the name of this trust, or of supplying any omission, curing any ambiguity or
curing, correcting or supplementing any defective or inconsistent provision
contained in this Declaration, by the Trustees without authorization by
shareholder vote.

                                      D-1
<PAGE>







                                                                      3690-PS-00
<PAGE>

EEN29B                            DETACH HERE


                                     PROXY

                    [EASTERN ENTERPRISES LOGO APPEARS HERE]

         THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF TRUSTEES OF
                              EASTERN ENTERPRISES

           for the Annual Meeting of Shareholders on April 26, 2000

The undersigned having received the notice of the Annual Meeting of Shareholders
and the proxy statement on behalf of the Board of Trustees of Eastern, hereby
appoints each of J. Atwood Ives and Fred C. Raskin proxies of the undersigned
(with full power of substitution) to attend the special meeting of shareholders
to be held on April 26, 2000 at 10:00 a.m., local time, at the Auditorium of
FleetBoston, 100 Federal Street, Boston, Massachusetts, and all adjournments
thereof and to vote all shares of Common Stock that the undersigned would be
entitled to vote. The undersigned directs that his or her vote be cast as
specified in this proxy.

If you wish to vote in accordance with the Board of Trustees' recommendations,
just sign this proxy on the reverse side. If no specification is made, this
proxy will be voted "FOR" the amendment to the Declaration of Trust, the
approval and adoption of the Agreement and Plan of Merger and the re-election of
the three Trustees named on the reverse side.

- ---------------                                                  ---------------
  SEE REVERSE     CONTINUED AND TO BE SIGNED ON REVERSE SIDE       SEE REVERSE
     SIDE                                                             SIDE
- ---------------                                                  ---------------
<PAGE>

EEN29A                           DETACH HERE

[X] Please mark                                                            _____
    votes as in                                                                |
    this example.                                                              |


1. To amend Section 38 of the Declaration
   of Trust to permit the merger of certain
   entities with and into Eastern (as
   described herein).

                FOR   AGAINST   ABSTAIN
                [_]     [_]       [_]

2. To approve and adopt the Agreement and
   Plan of Merger, dated as of November 4,
   1999, among KeySpan Corporation, ACJ
   Acquisition LLC and Eastern Enterprises, as
   amended.

                FOR   AGAINST   ABSTAIN
                [_]     [_]       [_]

3. To re-elect each of Messrs. (01) Clayton,
   (02) Jaskol and (03) Stone as Trustees,
   each with a term of office expiring at the
   2003 Annual Meeting of Shareholders.

              FOR          WITHHOLD
              ALL          FROM ALL
           NOMINEES  [_]   NOMINEES  [_]

   [_] ______________________________________
   To withhold vote for any nominee, write
   that nominee's name above.


- ----------------------------------------------
  THE BOARD OF TRUSTEES RECOMMENDS A VOTE
       "FOR" PROPOSALS 1, 2 AND 3.
- ----------------------------------------------

MARK HERE
FOR ADDRESS
CHANGE AND
NOTE BELOW    [_]


In their discretion, the proxies are authorized to consider and act upon such
other business matters or proposals (including adjournments) as may properly
come before the meeting or any adjournment or postponement thereof.

The undersigned acknowledges receipt of the Notice of Annual Meeting of
Shareholders to be held on April 26, 2000, and the related Proxy Statement.

PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED
ENVELOPE.

Please sign exactly as your name appears on the stock certificate. Joint owners
should each sign. When signing as attorney, executor, Trustee or guardian,
please give full title as such. If a corporation, please sign in full corporate
name by President or other authorized officer. If a partnership, please sign in
partnership name by an authorized person.

Signature: _______________ Date:________ Signature:_______________ Date:________


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