Document:

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                                                                   EXHIBIT 10.10
                                     NSTAR

                          Change in Control Agreement
                          ---------------------------

     AGREEMENT, made this 11th day of May, 1999, by and between Russell D.
Wright ("Executive") and NSTAR (the "Company").  This Agreement shall become
effective on the effective date (the "Effective Date") of the merger transaction
between Commonwealth Energy System and BEC Energy pursuant to the Amended and
Restated Agreement and Plan of Merger dated as of December 5, 1998 and amended
and restated as of May 4, 1999 among BEC Energy, Commonwealth Energy System, the
Company, BEC Acquisition, LLC and CES Acquisition, LLC.

                                 WITNESSETH

    WHEREAS, the Board of Trustees of the Company (the "Board") has determined
that it is in the best interests of the Company and its shareholders for the
Company to agree to provide benefits under the circumstances described below to
Executive and other executives who are responsible for the policy-making
functions of the Company and the overall viability of the Company's business;
and

    WHEREAS, the Board recognizes that the possibility of a change of control of
the Company is unsettling to such executives and desires to make arrangements at
this time to help assure their continuing dedication to their duties to the
Company and its shareholders, notwithstanding any attempts by outside parties to
gain control of the Company; and

    WHEREAS, the Board believes it important, should the Company receive
proposals from outside parties, to enable such executives, without being
distracted by the uncertainties of their own employment situation, to perform
their regular duties, and where appropriate to assess such proposals and advise
the Board as to the best interests of the Company and its shareholders and to
take such other action regarding such proposals as the Board determines to be
appropriate; and

    WHEREAS, the Board also desires to demonstrate to the executives that the
Company is concerned with their welfare and intends to provide that loyal
executives are treated fairly; and

    WHEREAS, the Board wishes to assure the executives of fair severance should
any of their employment terminate in specified circumstances following a change
of control of the Company and to assure the executives of other benefits upon a
change of control.

    NOW, THEREFORE, in consideration of the premises and the mutual covenants
contained herein, the parties hereto agree as follows:
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     1. In the event that any individual, corporation, partnership, company, or
other entity (a "Person"), which term shall include a "group" (within the
meaning of section 13(d) of the Securities Exchange Act of 1934 (the "Act")),
begins a tender or exchange offer, circulates a proxy to the Company's
shareholders, or takes other steps to effect a "Change of Control" (as defined
in Exhibit A attached hereto and made a part hereof), Executive agrees that he
will not voluntarily leave the employ of the Company and will render the
services contemplated in the recitals to this Agreement until such Person has
terminated the efforts to effect a Change of Control or until a Change of
Control has occurred.

     2. If, within 36 months following a Change of Control (the "Post Change of
Control Period") Executive's employment with the Company is terminated by the
Company for any reason other than for "Cause" or "Disability" (as defined
paragraph 4 below), or as a result of Executive's death, or Executive terminates
such employment for Good Reason (as defined in paragraph 5 below):

     (1)  the Company will pay to Executive within 30 days of such termination
          of employment a lump-sum cash payment equal to the sum of (i) the
          Executive's annual base salary ("Annual Base Salary") through the date
          of such termination of employment to the extent not theretofore paid,
          (ii) a prorated portion of the target award payable under the
          Company's Executive Annual Incentive Compensation Plan, or any
          comparable or successor plan (the "Annual Plan") determined by
          calculating the product of (A) the target bonus award payable for the
          fiscal year in which the date of termination occurs under the Annual
          Plan, times (B) a fraction, the numerator of which is the number of
          days in the current fiscal year through the date of termination of
          employment, and the denominator of which is 365, (iii) a prorated
          portion of the target award payable under the Company's Performance
          Share Plan, or any comparable or successor plan (the "Long-Term Plan")
          for the performance period ending on the last day of the fiscal year
          during which the date of termination of employment occurs determined
          by calculating the product of (A) the target award payable for such
          performance period and (B) a fraction, the numerator of which is the
          number of days in the current performance period through the date of
          termination, and the denominator of which is the actual number of days
          in the performance period (provided that if any awards are expressed
          in shares of common stock rather than cash, the Company will pay the
          cash equivalent of such awards based on the closing price per share as
          reported in the Wall Street Journal (Eastern Edition) New York Stock
          Exchange Composite Transactions determined on the date prior to the
          date of the Change of Control or the average per share price for the
          10 trading days preceding the date of the Change of Control (whichever
          is higher)) and (iv) any compensation for the fiscal year in which the
          date of termination occurs previously deferred by the Executive
          (together with any accrued interest or earnings thereon) and any
          accrued vacation pay, in each case to the extent not theretofore paid;
          and

     (2)  any stock, stock option or cash awards granted to the Executive by the
          Company that would have become vested upon continued employment by the
          Executive

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          shall immediately vest in full notwithstanding any provision to the
          contrary of such grant and shall remain exercisable until the earlier
          of the fifth anniversary of such termination and the latest date on
          which such grant could have been exercised; and

     (3)  the Company will pay to Executive within 30 days of such termination
          of employment a lump-sum cash payment equal to three times: (A) the
          amount of the Executive's Annual Base Salary at the rate in effect
          immediately prior to the date of termination or at the rate in effect
          immediately prior to the Change of Control, whichever is higher, and
          (B) the amount of the actual bonus paid to the Executive under the
          Annual Plan and the Long-Term Plan for the most recently completed
          fiscal year ended before the Change of Control, or the target bonus
          payable under the Annual Plan and Long-Term Plan for the fiscal year
          during which the termination of employment occurs, whichever is higher
          (provided that if any awards are expressed in shares of common stock
          rather than cash, the Company will pay the cash equivalent of such
          awards based on the closing price per share as reported in the Wall
          Street Journal (Eastern Edition) New York Stock Exchange Composite
          Transactions determined on the date prior to the date of the Change of
          Control or the average per share price for the 10 trading days
          preceding the date of the Change of Control (whichever is higher));
          and

     (4)  the Company will pay to Executive within 30 days of such termination
          of employment a lump-sum cash payment equal to the full balance
          standing to his credit with the Company under any and all deferred
          compensation plans or arrangements and the lump-sum actuarial
          equivalent of the Executive's accrued benefit under any supplement
          retirement plan or arrangement (the sum of the amounts described in
          subsections (a) and (d) shall be hereinafter referred to as the
          "Accrued Obligations"); and

     (5)  an amount equal to the excess of (i) the lump-sum actuarial equivalent
          of the accrued benefit under (a) the Company's qualified defined
          benefit Retirement Plan (the "Retirement Plan") (utilizing actuarial
          assumptions no less favorable to the Executive than those in effect
          under the Retirement Plan immediately prior to the date of the Change
          of Control), and (b) any supplemental retirement plan of the Company
          in which the Executive participates (the "SERP") which the Executive
          would receive if the Executive's employment continued for three years
          after the date of termination assuming for these purposes that all
          accrued benefits are fully vested, and further assuming that the
          Executive's annual compensation for purposes of determining benefits
          under the Retirement Plan and SERP ("Covered Compensation") in each of
          the three years is at least equal to the higher of Executive's annual
          rate of Covered Compensation for the most recently completed fiscal
          year ending prior to the date of the Change of Control or the year in
          which the Change of Control occurs, over (ii) the lump-sum actuarial
          equivalent of the Executive's actual accrued benefit (paid or
          payable), if any, under the Retirement Plan and the SERP as of the
          date of termination; and

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     (6)  Executive, together with his dependents, will continue following such
          termination of employment to participate fully at the Company's
          expense in all welfare benefit plans, programs, practices and
          policies, including without limitation, life, medical, disability,
          dental, accidental death and travel insurance plans, maintained or
          sponsored by the Company immediately prior to the Change of Control,
          or receive substantially the equivalent coverage (or the full value
          thereof in cash) from the Company, until the longer of the third
          anniversary of such termination or any longer period as may be
          provided by the terms of the appropriate plan, program, practice or
          policy, provided, however, that if the Executive becomes re-employed
          with another employer and is eligible to receive medical or other
          welfare benefits under another employer-provided plan, the medical and
          other welfare benefits described herein shall be secondary to those
          provided under such other plan during such applicable period of
          eligibility. For purposes of determining eligibility (but not the time
          of commencement of benefits) of the Executive for any retiree benefits
          pursuant to such plans, practices, programs and policies, the
          Executive shall be considered to have remained employed until three
          years after the date of termination and to have retired on the last
          day of such period; and

     (7)  to the extent not theretofore paid or provided for, the Company shall
          timely pay or provide to the Executive any other amounts or benefits
          required to be paid or provided or which the Executive is eligible to
          receive under any plan, program, policy, practice, contract or
          agreement of the Company ("Other Benefits"); and

     (8)  the Company will promptly reimburse Executive for any and all legal
          fees and expenses (including, without limitation, stenographer fees,
          printing costs, etc.) incurred by him as a result of such termination
          of employment, including without limitation all fees and expenses
          incurred to enforce the provisions of this Agreement or contesting or
          disputing that the termination of his employment is for Cause or other
          than for Good Reason (regardless of the outcome thereof).

    Notwithstanding anything herein to the contrary, to the extent that any
payment or benefit provided for herein is required to be paid or vested at any
earlier date under the terms of any plan, agreement or arrangement, such plan,
agreement or arrangement shall control.

     3. Death, Disability, Cause, Other Than For Good Reason.

     (1)  Death. If the Executive's employment shall terminate during the Post
          Change of Control Period by reason of the Executive's death, this
          Agreement shall terminate without further obligations to the
          Executive's legal representatives under this Agreement, other than for
          payment of Accrued Obligations and the timely payment or provision of
          Other Benefits. Accrued Obligations shall be paid to the Executive's
          estate or beneficiary, as applicable, in a lump sum in cash within 30
          days of death.

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     (2)  Disability. If the Executive's employment is terminated during the
          Post Change of Control Period by reason of the Executive's Disability,
          this Agreement shall terminate without further obligations to the
          Executive other than for payment of Accrued Obligations and the timely
          payment or provision of Other Benefits. Accrued Obligations shall be
          paid to the Executive in a lump sum in cash within 30 days of the date
          of termination of employment. For purposes of this Agreement,
          "Disability" shall mean the absence of the Executive from the
          Executive's duties with the Company on a full-time basis for 180
          consecutive business days as a result of incapacity due to mental or
          physical illness which is determined to be total and permanent by a
          physician selected by the Company or its insurers and acceptable to
          the Executive or the Executive's legal representative. If the Company
          determines in good faith that the Disability of the Executive has
          occurred during the Post Change of Control Period, it may give the
          Executive written notice of its intention to terminate the Executive's
          employment. In such event, the Executive's employment with the Company
          shall terminate effective on the 30th day after receipt of such notice
          by the Executive, provided that, within the 30 days of such receipt,
          the Executive shall not have returned to full-time performance of the
          Executive's duties.

     (3)  Cause. If the Executive's employment shall be terminated for Cause (as
          defined in Section 4 below) during the Post Change of Control Period,
          this Agreement shall terminate without further obligations to the
          Executive other than the obligation to pay the Executive (A) his
          Annual Base Salary through the date of termination, (B) the amount of
          any compensation previously deferred by the Executive, and (C) Other
          Benefits, in each case to the extent theretofore unpaid. If the
          Executive voluntarily terminates employment during the Post Change of
          Control Period, excluding a termination for Good Reason, this
          Agreement shall terminate without further obligations to the Executive
          other than for Accrued Obligations and the timely payment or
          provisions of Other Benefits.

    In such case, all Accrued Obligations shall be paid to the Executive in a
lump sum in cash within 30 days of date of the termination of employment.

     4. "Cause" means only: (a) commission of a felony or gross neglect of duty
by the Executive which is intended to result in substantial personal enrichment
of the Executive at the expense of the Company, (b) conviction of a crime
involving moral turpitude, or (c) willful failure by the Executive of his duties
to the Company which failure is deliberate on the Executive's part, results in
material injury to the Company, and continues for more than 30 days after
written notice given to the Executive pursuant to a two-thirds vote of all of
the members of the Board at a meeting called and held for such purpose (after
reasonable notice to Executive) and at which meeting the Executive and his
counsel were given an opportunity to be heard, such vote to set forth in
reasonable detail the nature of the failure. For purposes of this definition of
Cause, no act or omission shall be considered to have been "willful" unless it
was not in good faith and the Executive had knowledge at the time that the act
or omission was not in the best interest of the Company. Any act, or failure to
act, based on authority given pursuant to a

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resolution duly adopted by the Board or upon the instructions of the Chief
Executive Officer or another senior officer of the Company or based on the
advice of counsel of the Company shall be conclusively presumed to be done, or
omitted to be done, by the Executive in good faith and in the best interest of
the Company.

     5. Executive shall be deemed to have voluntarily terminated his employment
for Good Reason if the Executive leaves the employ of the Company for any reason
following:

     (1)  The assignment to the Executive of any duties inconsistent in any
          respect with the Executive's position (including status, offices,
          titles and reporting requirements), authority, duties or
          responsibilities immediately prior to the Change of Control; or any
          other action by the Company which results in a diminution in such
          position, authority, duties or responsibilities, excluding for this
          purpose an isolated, insubstantial and inadvertent action not taken in
          bad faith and which is remedied by the Company promptly after receipt
          of notice thereof given by the Executive; or

     (2)  Any reduction in the Executive's rate of Annual Base Salary for any
          fiscal year to less than 100% of the rate of Annual Base Salary paid
          to him in the completed fiscal year immediately preceding the Change
          of Control, or reduction in Executive's total cash and stock
          compensation opportunities, including salary and incentives, for any
          fiscal year to less than 100% of the total cash and stock compensation
          opportunities made available to him in the completed fiscal year
          immediately preceding the Change of Control (for this purpose, such
          opportunities shall be deemed reduced if the objective standards by
          which the Executive's incentive compensation measured become more
          stringent or the amount of such compensation is materially reduced on
          a discretionary basis from the amount that would be payable solely by
          reference to the objective standards); or

     (3)  Failure of the Company to continue in effect any retirement, life,
          medical, dental, disability, accidental death or travel insurance
          plan, in which Executive was participating immediately prior to the
          Change of Control unless the Company provides Executive with a plan or
          plans that provide substantially similar benefits, or the taking of
          any action by the Company that would adversely effect Executive's
          participation in or materially reduce Executive's benefits under any
          of such plans or deprive Executive of any material fringe benefit
          enjoyed by Executive immediately prior to the Change of Control other
          than an isolated, insubstantial and inadvertent failure not occurring
          in bad faith and which is remedied by the Company promptly after
          receipt of notice thereof given by the Executive; or

     (4)  The Company requires Executive to be based at any office or location
          outside the Greater Boston Metropolitan Area or the Company requires
          the Executive to travel on Company business to a substantially greater
          extent than required immediately prior to the date of Change of
          Control; or

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     (5)  Any purported termination by the Company of the Executive's employment
          otherwise than is expressly permitted by this Agreement; or

     (6)  Any failure by the Company to comply with and satisfy Section 8 of
          this Agreement.

    For purposes of this Section 5, any good faith determination of Good Reason
made by the Executive shall be conclusive.

     6. If any payment or benefit received by Executive (whether paid or payable
or distributed or distributable pursuant to the terms of this Agreement or
otherwise, but determined without regard to any additional payments required
under this Section 6) would be subject to the excise tax imposed by Section 4999
of the Internal Revenue Code of 1986, as amended (the "Code"), or any interest
or penalties are incurred by the Executive with respect to such excise tax), the
Company will pay to Executive an additional amount in cash (the "Additional
Amount") equal to the amount necessary to cause the aggregate payments and
benefits received by Executive, including such Additional Amount (net of all
federal, state, and local income taxes and all taxes payable as a result of the
application of Sections 28OG and 4999 of the Code and including any interest and
penalties with respect to such taxes) to be equal to the aggregate payments and
benefits Executive would have received, excluding such Additional Amount (net of
all federal, state and local income taxes) as if Sections 28OG and 4999 of the
Code (and any successor provisions thereto) had not been enacted into law.

     Following the termination of Executive's employment, Executive may submit
to the Company a written opinion (the "Opinion") of a nationally recognized
accounting firm, employment consulting firm, or law firm selected by Executive
setting forth a statement and a calculation of the Additional Amount. The
determination of such firm concerning the extent of the Additional Amount (which
determination need not be free from doubt), shall be final and binding on both
Executive and the Company. The Company will pay to Executive the Additional
Amount not later than 10 days after such firm has rendered the Opinion. The
Company agrees to pay the fees and expenses of such firm in preparing and
rendering the Opinion.

     If, following the payment to Executive of the Additional Amount,
Executive's liability for the excise tax imposed by Section 4999 of the Code on
the payments and benefits received by Executive is finally determined (at such
time as the Internal Revenue Service is unable to make any further adjustment to
the amount of such liability) to be less than the amount thereof set forth in
the Opinion, Executive shall reimburse the Company, without interest, in an
amount equal to the amount by which the Additional Amount should be reduced to
reflect such decrease in the actual excise tax liability. The calculation of
such reimbursement shall be made by a nationally recognized accounting firm, an
employment consulting firm, or a law firm selected by Executive, whose
determination shall be binding on Executive and the Company and whose fees and
expenses therefore shall be paid by the Company.

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     7. In the case of any dispute under this Agreement, Executive may initiate
binding arbitration in Boston, Massachusetts, before the American Arbitration
Association by serving a notice to arbitrate upon the Company or, at Executive's
election, institute judicial proceedings, in either case within 90 days of the
effective date of his termination or, if later, his receipt of notice of
termination, or such longer period as may be reasonably necessary for Executive
to take such action if illness or incapacity should impair his taking such
action within the 90-day period. The Company shall not have the right to
initiate binding arbitration, and agrees that upon the initiation of binding
arbitration by Executive pursuant to this paragraph 7 the Company shall cause to
be dismissed any judicial proceedings it has brought against Executive relating
to this Agreement. The Company authorizes Executive from time to time to retain
counsel of his choice to represent Executive in connection with any and all
actions, proceedings, and/or arbitration, whether by or against the Company or
any trustee, officer, shareholder, or other person affiliated with the Company,
which may affect Executive's rights under this Agreement. The Company agrees (i)
to pay the fees and expenses of such counsel, (ii) to pay the cost of such
arbitration and/or judicial proceeding, and (iii) to pay interest to Executive
on all amounts owed to Executive under this Agreement during any period of time
that such amounts are withheld pending arbitration and/or judicial proceedings.
Such interest will be at the base rate as announced from time to time by
BankBoston, N.A.

    In addition, notwithstanding any existing prior attorney-client relationship
between the Company and counsel retained by Executive, the Company irrevocably
consents to Executive entering into an attorney-client relationship with such
counsel and agrees that a confidential relationship shall exist between
Executive and such counsel.

     8. If the Company is at any time before or after a Change of Control merged
or consolidated into or with any other corporation or other entity (whether or
not the Company is the surviving entity), or if substantially all of the assets
thereof are transferred to another corporation or other entity, the provisions
of this Agreement will be binding upon and inure to the benefit of the
corporation or other entity resulting from such merger or consolidation or the
acquirer of such assets (the "Successor Entity"), and this paragraph 8 will
apply in the event of any subsequent merger or consolidation or transfer of
assets. The Company will require any such Successor Entity to assume expressly
and agree to perform this Agreement in the same manner and to the same extent
that the Company would be required to perform if no such transaction had taken
place. As used in this Agreement, "Company" shall mean the Company as
hereinbefore defined and any Successor Entity which assumes and agrees to
perform this Agreement by operation of law or otherwise.

     In the event of any merger, consolidation, or sale of assets described
above, nothing contained in this Agreement will detract from or otherwise limit
Executive's right to or privilege of participation in any stock option or
purchase plan or any bonus, profit sharing, pension, group insurance,
hospitalization, or other incentive or benefit plan or arrangement which may be
or become applicable to executives of the corporation resulting from such merger
or consolidation or the corporation acquiring such assets of the Company.

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     In the event of any merger, consolidation, or sale of assets described
above, references to the Company in this Agreement shall unless the context
suggests otherwise be deemed to include the entity resulting from such merger or
consolidation or the acquirer of such assets of the Company.

     9. Any termination by the Company for Cause, or by the Executive for Good
Reason, shall be communicated by Notice of Termination to the other party hereto
given in accordance with the last paragraph of Section 14 of this Agreement. For
purposes of this Agreement, a "Notice of Termination" means a written notice
which (i) indicates the specific termination provision in this Agreement relied
upon, (ii) to the extent applicable, sets forth in reasonable detail the facts
and circumstances claimed to provide a basis for termination of the Executive's
employment under the provision so indicated and (iii) if the Date of Termination
(as defined below) is other than the date of receipt of such notice, specifies
the termination date (which date shall be not more than thirty days after the
giving of such notice). The failure by the Executive or the Company to set forth
in the Notice of Termination any fact or circumstance which contributes to a
showing of Good Reason or Cause shall not waive any right of the Executive or
the Company, respectively, hereunder or preclude the Executive or the Company,
respectively, from asserting such fact or circumstance in enforcing the
Executive's or the Company's rights hereunder.

     "Date of Termination" means (i) if the Executive's employment is terminated
by the Company for Cause, or by the Executive for Good Reason, the date of
receipt of the Notice of Termination or any later date specified therein, as the
case may be, (ii) if the Executive's employment is terminated by the Company
other than for Cause or Disability, the Date of Termination shall be the date on
which the Company notifies the Executive of such termination and (iii) if the
Executive's employment is terminated by reason of death or Disability, the Date
of Termination shall be the date of death of the Executive or the effective date
of the Disability, as the case may be.

     10. All payments required to be made by the Company hereunder to Executive
or his dependents, beneficiaries, or estate will be subject to the withholding
of such amounts relating to tax and/or other payroll deductions as may be
required by law.

     11. There shall be no requirement on the part of the Executive to seek
other employment or otherwise mitigate damages in order to be entitled to the
full amount of any payments and benefits to which Executive is entitled under
this Agreement, and the amount of such payments and benefits shall not be
reduced by any compensation or benefits received by Executive from other
employment.

     12. Nothing contained in this Agreement shall be construed as a contract of
employment between the Company and the Executive, or as a right of the Executive
to continue in the employ of the Company, or as a limitation of the right of the
Company to discharge the

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Executive with or without Cause; provided that the Executive shall have the
right to receive upon termination of his employment the payments and benefits
provided in this Agreement and shall not be deemed to have waived any rights he
may have either at law or in equity in respect of such discharge.

     13. No amendment, change, or modification of this Agreement may be made
except in writing, signed by both parties.

     14. This Agreement shall terminate on the third anniversary of the
Effective Date, provided, however, that commencing on the date one year after
the Effective Date, and on each annual anniversary of such date (each such date
hereinafter referred to as a "Renewal Date"), unless previously terminated, the
term of this Agreement shall be automatically extended so as to terminate three
years from such Renewal Date, unless at least sixty days prior to the Renewal
Date the Company shall give notice to the Executive that the term of this
Agreement shall not be so extended. This Agreement shall not apply to a Change
of Control which takes place after the termination of this Agreement.

     Payments made by the Company pursuant to this Agreement shall be in lieu of
severance payments, if any, which might otherwise be available to Executive
under any severance plan, policy, program or arrangement generally applicable to
the employees of the Company. If for any reason Executive receives severance
payments (other than under this Agreement) upon the termination of his
employment with the Company, the amount of such payments shall be deducted from
the amount paid under this Agreement. The purpose of this provision is solely to
avert a duplication of benefits; neither this provision nor the provisions of
any other agreement shall be interpreted to reduce the amount payable to
Executive below the amount that would otherwise have been payable under this
Agreement.

     The provisions of this Agreement shall be binding upon and shall inure to
the benefit of Executive, his executors, administrators, legal representatives,
and assigns, and the Company and its successors.

     The validity, interpretation, and effect of this Agreement shall be
governed by the laws of The Commonwealth of Massachusetts. Any ambiguities in
this Agreement shall be construed in favor of the Executive.

     The invalidity or unenforceability of any provisions of this Agreement
shall not affect the validity or enforceability of any other provision of this
Agreement, which shall remain in full force and effect.

     The Company shall have no right of set-off or counterclaims, in respect of
any claim, debt, or obligation, against any payments to Executive, his
dependents, beneficiaries, or estate provided for in this Agreement.

     No right or interest to or in any payments shall be assignable by the
Executive; provided, however, that this provision shall not preclude him from
designating one or more beneficiaries to

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receive any amount that may be payable after his death and shall not preclude
the legal representative of his estate from assigning any right hereunder to the
person or persons entitled thereto under his will or, in the case of intestacy,
to the person or persons entitled thereto under the laws of intestacy applicable
to his estate. The term "beneficiaries" as used in this Agreement shall mean a
beneficiary or beneficiaries so designated to receive any such amount, or if no
beneficiary has been so designated, the legal representative of the Executive's
estate.

     No right, benefit, or interest hereunder shall be subject to anticipation,
alienation, sale, assignment, encumbrance, charge, pledge, hypothecation, or
set-off in respect of any claim, debt, or obligation, or to execution,
attachment, levy, or similar process, or assignment by operation of law. Any
attempt, voluntary or involuntary, to effect any action specified in the
immediately preceding sentence shall, to the full extent permitted by law, be
null, void, and of no effect.

     All notices and other communications hereunder shall be in writing and
shall be given by hand delivery to the other party or by registered or certified
mail, return receipt requested, postage prepaid, addressed as follows:

     If to the Executive: Russell D. Wright
                          COMEnergy
                          One Main Street
                          P.O. Box 9150
                          Cambridge, MA  02142-9150

     If to the Company:   NSTAR
                          800 Boylston Street
                          Boston, MA  02199
                          Attention: General Counsel

or to such other address as either party shall have furnished to the other in
writing in accordance herewith.  Notice and communications shall be effective
when actually received by the addressee.

     IN WITNESS WHEREOF, NSTAR and Executive have each caused this Agreement to
be duly executed and delivered as of the date set forth above.

                         NSTAR

                         By: /s/ Thomas J. May
                             -----------------
                             Name: Thomas J. May
                             Title: Chairman and CEO

                             /s/ R. D. Wright
                             ----------------
                             Russell D. Wright

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                                 EXHIBIT A

     Change of Control. For the purposes of this Agreement, a "Change of
Control" shall mean:

(1)  The acquisition by any Person of beneficial ownership (within the meaning
     of Rule 13d-3 promulgated under the Exchange Act) of 30% or more of either
     (i) the then outstanding shares of common stock of the Company (the
     "Outstanding Company Common Stock") or (ii) the combined voting power of
     the then outstanding voting securities of the Company entitled to vote
     generally in the election of trustees (the "Outstanding Company Voting
     Securities"); provided, however, that for purposes of this subsection (a),
     the following acquisitions shall not constitute a Change of Control: (i)
     any acquisition directly from the Company, (ii) any acquisition by the
     Company, (iii) any acquisition by any employee benefit plan (or related
     trust) sponsored or maintained by the Company or any corporation controlled
     by the Company or (iv) any acquisition by any corporation pursuant to a
     transaction which complies with clauses (i), (ii) and (iii) of subsection
     (c) of this Exhibit A; or

(2)  Individuals who, as of the date hereof, constitute the Board (the
     "Incumbent Board") cease for any reason to constitute at least a majority
     of the Board; provided, however, that any individual becoming a trustee
     subsequent to the date hereof whose election, or nomination for election by
     the Company's shareholders, was approved by a vote of at least a majority
     of the trustees then comprising the Incumbent Board shall be considered as
     though such individual were a member of the Incumbent Board, but excluding,
     for this purpose, any such individual whose initial assumption of office
     occurs as a result of an actual or threatened election contest with respect
     to the election or removal of trustees or other actual or threatened
     solicitation of proxies or consents by or on behalf of a Person other than
     the Board; or

(3)  Consummation of a reorganization, merger or consolidation or sale or other
     disposition of all or substantially all of the assets of the Company (a
     "Business Combination"), in each case, unless, following such Business
     Combination, (i) all or substantially all of the individuals and entities
     who were the beneficial owners, respectively, of the Outstanding Company
     Common Stock and Outstanding Company Voting Securities immediately prior to
     such Business Combination beneficially own, directly or indirectly, more
     than 50% of, respectively, the then outstanding shares of common stock and
     the combined voting power of the then outstanding voting securities
     entitled to vote generally in the election of directors, as the case may
     be, of the corporation resulting from such Business Combination (including,
     without limitation, a corporation which as a result of such transaction
     owns the Company or all or substantially all of the Company's assets either
     directly or through one or more subsidiaries) in substantially the same
     proportions as their ownership, immediately prior to such Business
     Combination of the Outstanding Company Common Stock and outstanding Company
     Voting

                                      -12-
<PAGE>

     Securities, as the case may be, (ii) no Person (excluding any corporation
     resulting from such Business Combination or any employee benefit plan (or
     related trust) of the Company or such corporation resulting from such
     Business Combination) beneficially owns, directly or indirectly, 30% or
     more of, respectively, the then outstanding shares of common stock of the
     corporation resulting from such Business Combination or the combined voting
     power of the then outstanding voting securities of such corporation except
     to the extent that such ownership existed prior to the Business Combination
     and (iii) at least a majority of the members of the board of directors of
     the corporation resulting from such Business Combination were members of
     the Incumbent Board at the time of the execution of the initial agreement,
     or of the action of the Board, providing for such Business Combination; or

(4)  Approval by the shareholders of the Company of a complete liquidation or
     dissolution of the Company.

                                      -13-<PAGE>

                                                                   EXHIBIT 10.11

                                     NSTAR
                          DEFERRED COMPENSATION PLAN

                     (RESTATED EFFECTIVE AUGUST 25, 1999)

1.   PURPOSE AND EFFECTIVE DATE

     The purpose of this Plan is to provide an arrangement whereby eligible
executives of NSTAR and its affiliates can elect to defer receipt of designated
percentages or amounts of their salary and incentive awards.  This Plan Document
constitutes an amendment, restatement and continuation of the Boston Edison
Company Deferred Compensation Plan (the "Edison Deferred Compensation Plan"),
which was last restated effective January 1, 1999. This document also replaces
the following plans previously maintained by Commonwealth Energy System ("CES")
for its executives, each of which were terminated by CES effective as of August
25, 1999:  The Commonwealth Energy System Long Term Incentive Plan (the
"CESLTIP"); The Commonwealth Energy System Deferred Compensation Plan (the "CES
Deferred Compensation Plan"); The executive salary continuation portion of the
Executive Salary Continuation and Excess Benefit Plan For Employees of
Commonwealth Energy System and Subsidiary Companies (the "CES Salary
Continuation Benefit").  This restated Plan is effective August 25, 1999 (the
"Effective Date").  No benefits shall be payable under said terminated CES Plans
on or after the Effective Date to any Participant under this Plan or his or her
beneficiary.
<PAGE>

     The Plan is intended to be "a plan which is unfunded and is maintained by
an employer primarily for the purpose of providing deferred compensation for a
select group of management or highly compensated employees" within the meaning
of sections 201(2), 301(a)(3) and 401(a)(3) of the Employee Retirement Income
Security Act of 1974, as amended ("ERISA"), and shall be administered in a
manner consistent with that intent.

2.   DEFINITIONS

     (a)  "Base Salary" means the Participant's annualized Salary in effect on
January 1 of a year from which the Participant defers compensation.

     (b)  "Change of Control" has the meaning set forth in Appendix A.

     (c)  "Code" means the Internal Revenue Code of 1986 as amended from time to
time.

     (d)  "Committee" means the Executive Personnel Committee of the Company.

     (e)  "Company" means NSTAR.

     (f)  "Deferral Account" means the deferral account described in section 6.

     (g)  "Disability" means a disability as defined for purposes of the
Company's long-term disability insurance plan.  For purposes of Section 7(c),
Disability shall be deemed to occur upon the expiration of thirty (30) months
from the commencement of the Participant's condition of disability.

     (h)  "Incentive Award" means, for any calendar year, such amount or amounts
as are payable to a Participant under any incentive award or bonus program
provided by the Company or its affiliate which is payable in cash or Shares.

     (i)  "Participant" means an executive who participates in the Plan.

     (j)  "Plan" means the NSTAR Deferred Compensation Plan as set forth herein
and as from time to time amended.

                                      -2-
<PAGE>

     (k)  "Plan Administrator" means the Committee or other person or persons
authorized to administer the Plan in accordance with Section 9.

     (l)  "Retirement" means termination of employment from the Company after
either (i) attaining age 55, or (ii) completing 20 years of employment with the
Company or its affiliate..

     (m)  "Salary" means the fixed basic compensation of a Participant from the
Company or its affiliate excluding any special compensation such as overtime,
bonus payments, disability insurance benefits, severance pay or other similar
distributions, and Company or affiliate  contributions under any employee
benefit plan; provided, that Salary shall include amounts that would have been
received by the Participant from the Company or its successor as fixed basic
compensation but for an election under section 401(k) or section 125 of the Code
or a deferral election under this Plan.

     (n)  "Salary Increase" means the amount, if any, by which a Participant's
Salary for any year may be increased over the Base Salary amount in effect on
January 1 of such year.

     (o)  "Shares" mean shares of the Company.

3.   ELIGIBILITY

     Such employees of the Company or its affiliates as are selected by the
Company shall be eligible to become Participants in the Plan provided they
complete such forms as the Plan Administrator may require.

4.   ELECTIVE DEFERRALS

     A Participant may elect to defer such portion of his or her Base Salary,
Salary Increase or Incentive Award otherwise payable in or for a calendar year
as the Plan Administrator may

                                      -3-
<PAGE>

prescribe prior to the start of such calendar year. The Plan Administrator may
limit the amount or percentage of Base Salary, Salary Increase or Incentive
Award that a Participant may defer hereunder.

5.   DEFERRAL ELECTIONS

     A Participant's election of deferral under Section 4 shall be in the form
prescribed by the Plan Administrator and shall be subject to such terms and
conditions as the Plan Administrator may prescribe.  The election of deferral
must be filed prior to the first day of the "Deferral Period" as hereinafter
defined.  Each election shall specify the percentage or amount of the
Participant's Base Salary, Salary Increase or Incentive Award to be credited to
his or her Deferral Account instead of being paid currently to the Participant,
and the payment period (including a single sum payment if so elected) for the
distribution in respect of such deferral.  Each election shall be binding with
respect to the Base Salary, Salary Increase and Incentive Award for such period
(not less than one year) as the Plan Administrator shall specify (the "Deferral
Period") and shall be irrevocable for the calendar year or years to which it
applies.  Notwithstanding the foregoing, an employee who becomes a Participant
during the calendar year may make an election of deferral for the balance of
such calendar year provided he or she makes such election within 30 days of the
date he or she becomes a Participant.

     Short-term disability payments shall be treated for purposes of deferral
hereunder as Base Salary; provided, that if within forty-five (45) days
following the commencement of such Disability the Participant so elects, short-
term disability payments in respect of the seventh month following the
commencement of the Participant's Disability, and subsequent months, shall be
paid currently and not deferred.  Long-term disability benefits may not be
deferred under this Plan.

                                      -4-
<PAGE>

6.  DEFERRAL ACCOUNT

     The Plan Administrator shall maintain a Deferral Account on behalf of each
Participant as follows:

     (a)  Opening Balance.

          (1)  The Edison Deferred Compensation Plan.  Each Participant who
     deferred amounts under the Edison Deferred Compensation Plan prior to the
     Effective Date shall have an opening balance in his or her Deferral Account
     under the Plan on the Effective Date equal to the value of his or her
     deferral account under the Edison Deferred Compensation Plan as of the
     Effective Date.

          (2)  CES Deferred Compensation Plan, CESLTIP and CES Salary
     Continuation Benefit.  Each Participant who prior to the Effective Date
     deferred amounts under the CES Deferred Compensation Plan and/or elected to
     waive his or her right to receive awards under the CESLTIP and/or had a CES
     Salary Continuation Benefit shall have an opening balance in his or her
     Deferral Account under the Plan on the Effective Date equal to the sum of
     (i) the value of his or her deferral account under the CES Deferred
     Compensation Plan as of the Effective Date, plus (ii) the value of his or
     her waived awards under the CESLTIP as of the Effective Date, plus (iii)
     the value of his or her CES Salary Continuation Benefit as of the Effective
     Date.  The credits described in this subparagraph (2) shall be in lieu of
     amounts previously payable under the aforesaid CES Plans and each
     Participant receiving such credit expressly agrees to waive any claim he or
     she may have for payment of benefits under said CES Plans.

     (b)  Deferrals.  For each deferral election made by the Participant in
respect of periods on and after the Effective Date, the Plan Administrator shall
credit to the Participant's Deferral

                                      -5-
<PAGE>

Account the amounts of Base Salary, Salary Increase or Incentive Award, as
applicable, which the Participant has elected to defer under the Plan. In each
case, credits shall be made as of the dates the Salary, Salary Increase or
Incentive Award would have been payable if not deferred.

     (c)  Investment Measurements.  Subject to paragraph (d) below, from time to
time the Company will establish investment measurements to be used to adjust the
balance of each Participant's Deferral Account.  Such investment measurements
may be changed from time to time by the Company.  The Company may establish
rules and procedures to permit Participants to select investments for their
respective Deferral Accounts from among available investment measurements.  From
time to time, as determined by the Plan Administrator, each Participant's
Deferral Account will be adjusted to reflect such investment measurements.

     (d)  Shares.  A Participant who elects to defer an Incentive Award which is
payable in Shares shall have the value of such deferred award determined with
reference to the number of whole Shares which could be purchased with said
amount in the open market as promptly as possible following the effective date
of such election.  Any dividends on such Shares will be reinvested or deemed
reinvested in such Shares.  Such number of Shares (and the value thereof) shall
be credited from time to time to the Participant's Deferral Account.  The
Company may, but shall not be required to, purchase Shares to satisfy its
obligation to Participants under this paragraph.  If such purchase of Shares is
made, the Company may, in its discretion and subject to such limitations as it
may determine, permit a Participant to exercise voting rights with respect to
such Shares as are allocated to his account.

7.   COMMENCEMENT OF DISTRIBUTIONS; PAYMENT PERIODS

     (a)  Inservice Distributions.  At the time the Participant makes an
election of deferral under Section 4, and subject to the conditions of this
Section, a Participant may also elect to

                                      -6-
<PAGE>

receive a single sum payment of all or a specified portion of the amount
attributable to such deferral on a fixed date prior to the Participant's
Retirement, Disability, or other termination of employment (hereinafter referred
to as the "initial fixed date"). Such initial fixed date must be at least five
years after the date of such deferral. In addition, at least two years prior to
the initial fixed date, a Participant may elect to defer payment of such amount
to a later fixed date (hereinafter referred to as the "subsequent fixed date")
which must be at least three years after the initial fixed date. Furthermore, at
least two years prior to the subsequent fixed date, a Participant may elect to
defer payment of such amount until his or her Retirement, Disability, or other
termination of employment. The rules and procedures for such elections will be
promulgated by the Plan Administrator. All elections under this Section 7(a)
require the consent of the Company to become effective.

     (b)  Special one-time inservice distribution.  In addition to the elections
described in paragraph (a) above, a Participant may request a special one-time
inservice distribution of part or all of his or her Deferral Account for the
sole purpose of contributing such amount to a charity selected by the
Participant which is exempt from federal income tax under section 501(c)(3) of
the Code.  Such request must be made in writing to the Plan Administrator at
least six months prior to the requested distribution date and requires the
consent of the Plan Administrator to become effective.

     (c)  Retirement or Disability.  Upon the Participant's Retirement or
Disability, the Participant shall be entitled to receive the balance in his or
her Deferral Account.  The Deferral Account shall be payable as the Participant
shall have specified in his or her election of deferral from among the options
prescribed by the Plan Administrator provided, however, if requested by the
Participant prior to his or her Retirement Date, the Plan Administrator may in
its sole

                                      -7-
<PAGE>

discretion pay the Participant the entire balance of his or her Deferral Account
in a single sum. Payment shall be made (or if paid other than in a single sum,
shall commence) on the first day of the calendar quarter following Retirement or
Disability or as soon as practicable thereafter. Notwithstanding the foregoing
provisions of this paragraph, in the case of a Participant whose Retirement date
is prior to his or her attainment of age 65, such Participant may elect to defer
commencement of payment of part or all of his or her Deferral Account until he
or she attains age 65. Any such election to defer commencement of payment beyond
the Participant's Retirement date must be made in writing to the Plan
Administrator at least six months prior to the Retirement date and requires the
consent of the Plan Administrator to become effective.

     (d)  Termination of Employment.  If the Participant ceases to be an
employee of the Company and its affiliates for reasons other than death,
Disability or Retirement, the balance in the Participant's Deferral Account
(determined as of the last day of the month immediately preceding payment) shall
be paid to the Participant in a single sum on the first day of the calendar
quarter following the date he or she so ceases to be an employee or as soon as
practicable thereafter.

     (e)  Death.  If the Participant dies prior to the commencement of payment
of his or her Deferral Account as described in Section 7(c), the Participant's
designated beneficiary or beneficiaries shall be entitled to receive the balance
in the Participant's Deferral Account as of the date of death.  Payment shall be
made in a single sum on the first day of the second month following the month in
which the Participant dies or as soon as practicable thereafter.  If the
Participant dies after payment of his or her Deferral Account has commenced to
be paid in installments under Section 7(c) but prior to the exhaustion of such
Account, payment of the remaining balance of such Account (adjusted as provided
in Section 7(c)) shall continue to the

                                      -8-
<PAGE>

Participant's designated beneficiary or beneficiaries over the installment
period selected by the Participant. Designation of a beneficiary or
beneficiaries for purposes of the Plan shall be made on a form prescribed or
approved by the Plan Administrator.

     (f) Form of Distributions. All distributions under the Plan shall be paid
in cash, except for amounts credited under Section 6(d) which shall be paid in
Shares.

8.   EMERGENCY BENEFIT

     If a Participant suffers a financial emergency, upon the written request of
the Participant, the Plan Administrator in its sole discretion may distribute
that portion of the Participant's Deferral Account, if any, which it determines
to be necessary to meet the immediate financial emergency.  A financial
emergency shall include major uninsured medical expense, major uninsured
casualty or property losses, and such other financial emergencies as the Plan
Administrator may, in its discretion, determine, provided that the Participant
demonstrates to the Plan Administrator's satisfaction that he or she lacks
available resources to meet the emergency.  Any such distribution shall reduce
the balance in the Participant's Deferral Account available for distribution in
accordance with Section 7.

9.   ADMINISTRATION OF THE PLAN

     For purposes of prescribing the forms and conditions for deferral elections
under Section 5 and inservice distributions under Section 7(a) and 7(b) (or
other forms required to administer the Plan), and for purposes of Section 6, the
functions of the Plan Administrator shall be performed by the Chief Financial
Officer of the Company or his or her delegates.  For purposes of Section 8, the
functions of the Plan Administrator shall be carried out by a committee (acting
by the vote or consent of a majority of its members) consisting of the Vice
President of Human Resources, the Chief Financial Officer and the Treasurer of
the Company; provided, that any

                                      -9-
<PAGE>

determination under Section 8 with respect to any of those officers shall be
made without his or her participation on such committee. All other
administrative and interpretative functions of the Plan Administrator under the
Plan shall be vested in the Committee. The Plan Administrator shall have full
discretion to administer the Plan in all respects. A decision by the Plan
Administrator shall be final, conclusive and binding on all Participants and any
person claiming under or through any Participant. The Plan Administrator shall
exercise its functions hereunder in such manner as it deems appropriate and may,
in its discretion, waive the application of any rule to any Participant. The
Plan Administrator shall have no responsibility to exercise its discretion in a
uniform manner among similarly situated Participants, and no decision with
respect to any Participant shall give any other Participant the right to have
the same decision applied to him or her.

                                      -10-
<PAGE>

10.  NATURE OF CLAIM FOR PAYMENTS

     Except as herein provided, the Company and its affiliates shall not be
required to set aside or segregate any assets of any kind to meet any of its
obligations hereunder, and all obligations of the Company or its affiliates
hereunder shall be reflected by book entries only.  The Participant shall have
no rights on account of this Plan in or to any specific assets of the Company or
its affiliates.  Any rights that the Participant may have on account of this
Plan shall be those of a general, unsecured creditor of the Company or its
affiliates.  However, the Company or its affiliate may establish a trust or
trusts of which the Company or its affiliate is treated as the owner under
Subpart E of Subchapter J, Chapter 1 of the Code (a "grantor trust"), and may
from time to time deposit funds in such grantor trust or trusts to facilitate
payment of the benefits provided under the Plan.  In the event the Company or
its affiliate establishes such a grantor trust or trusts with respect to the
Plan and at the time of a Change of Control, any such trust (i) has not been
terminated or revoked and (ii) is not "fully funded" (as determined in its sole
discretion by a majority of the individuals who were members of the Committee
immediately prior to a Change of Control), the Company or its affiliate shall
within ten days of such Change of Control deposit in such grantor trust or
trusts assets sufficient to cause the trust or trusts to be "fully funded" as of
the date of the deposit (as determined in its sole discretion by a majority of
the individuals who were members of the Committee prior to a Change of Control).

11.  RIGHTS ARE NON-ASSIGNABLE

     Neither the Participant nor any beneficiary nor any other person shall have
any right to assign or otherwise alienate the right to receive payments
hereunder, in whole or in part, which payments are expressly agreed to be non-
assignable and non-transferable, whether voluntarily or involuntarily.

                                      -11-
<PAGE>

12.  TAXES

     If the Company or its affiliate is required to withhold taxes from payments
under the Plan, the amounts payable to Participants shall be reduced by the tax
so withheld.  To determine the amount of tax to withhold, in the case of
payments in Shares, such Shares will be valued at the average of that day's high
and low price on the day of distribution as reported in the Wall Street Journal.

13.  TERMINATION; AMENDMENT

     The Plan shall continue in effect until terminated by action of the Company
or the Committee.  Upon termination of the Plan, no deferral of Salary, Salary
Increase or Incentive Awards thereafter paid or payable to a Participant shall
be made and no individual not a Participant as of the date of termination shall
become a Participant thereafter.  If, at the time of termination, there is any
Participant or beneficiary of a Participant who is or will be entitled to a
payment hereunder, the Plan Administrator shall elect either (a) to make
payments to such Participants or beneficiaries in the normal course as if the
Plan had continued in effect, or (b) to pay to such Participants or
beneficiaries the balance in the Participant's Deferral Account in a single sum
payment.

     The Company or the Committee may at any time and from time to time amend
the Plan in any manner; provided that no amendment or termination shall reduce
the amounts previously credited to the Deferral Account of any Participant or
his or her beneficiary without his or her prior written consent; and provided
further, that no amendment or termination following a Change of Control shall
eliminate or reduce the Company's or its affiliates' obligations to deposit
assets in the grantor trust or trusts as described in Section 10.  Furthermore,
following a Change of Control, this Section 13 may not be amended.

                                      -12-
<PAGE>

14.  EMPLOYMENT RIGHTS

     Nothing in this Plan shall give any Participant any right to be employed or
to continue employment by the Company or an affiliate.

     IN WITNESS WHEREOF, the Company has caused this Plan to be executed by its
officer hereunto duly authorized this 4th day of August, 2000.

                              NSTAR

                              By: /s/ Thomas J. May
                                  -----------------

                                      -13-
<PAGE>

                                  Appendix A
                                  ----------
                              "Change of Control"

     For the purposes of this Plan, a "Change of Control" shall mean:

     1. The acquisition by any Person of ultimate beneficial ownership (within
the meaning of Rule 13d-3 promulgated under the Exchange Act) of 30% or more of
either (i) the then outstanding common shares (or shares of common stock) of the
Parent (the "Outstanding Parent Common Shares") or (ii) the combined voting
power of the then outstanding voting securities of the Parent entitled to vote
generally in the election of trustees (or directors) (the "Outstanding Parent
Voting Securities"); provided, however, that for purposes of this subsection
(a), the following acquisitions shall not constitute a Change of Control: (i)
any acquisition directly from the Parent, (ii) any acquisition by the Parent or
an affiliate of the Parent, (iii) any acquisition by any employee benefit plan
(or related trust) sponsored or maintained by the Parent, the Company or
affiliate of the Parent or (iv) any acquisition by any Person pursuant to a
transaction which complies with clauses (i), (ii) and (iii) of subsection (c) of
this Appendix A; or

     2. Individuals who, as of the date hereof, constitute the Board of Trustees
of the Parent (the "Incumbent Board") cease for any reason to constitute at
least a majority of such board; provided, however, that any individual becoming
a trustee (or director) subsequent to the date hereof whose election, or
nomination for election by the Parent's shareholders, was approved by a vote of
at least a majority of the trustees (or directors) then comprising the Incumbent
Board shall be

                                      -14-
<PAGE>

considered as though such individual were a member of the Incumbent Board, but
excluding, for this purpose, any such individual whose initial assumption of
office occurs as a result of an actual or threatened election contest with
respect to the election or removal of trustees (or directors) or other actual or
threatened solicitation of proxies or consents by or on behalf of a Person other
than such board; or

     3. Consummation of a reorganization, merger or consolidation or sale or
other disposition of all or substantially all of the assets of the Parent (a
"Business Combination"), in each case, unless, following such Business
Combination, (i) all or substantially all of the individuals and entities who
were the beneficial owners, respectively, of the Outstanding Parent Common
Shares and Outstanding Parent Voting Securities immediately prior to such
Business Combination beneficially own, directly or indirectly, immediately
following such Business Combination more than 50% of, respectively, the then
outstanding common shares (or shares of common stock) and the combined voting
power of the then outstanding voting securities entitled to vote generally in
the election of trustees (or directors), as the case may be, of the entity
resulting from such Business Combination (including, without limitation, an
entity which as a result of such transaction owns the Parent or all or
substantially all of the Parent's assets either directly or through one or more
subsidiaries) in substantially the same proportions as their ownership,
immediately prior to such Business Combination of the Outstanding Parent Common
Shares and Outstanding Parent Voting Securities, as the case may be, (ii) no
Person (excluding any entity resulting from such Business Combination or

                                      -15-
<PAGE>

any employee benefit plan (or related trust) of the Parent or the Company or
such entity resulting from such Business Combination) ultimately beneficially
owns, directly or indirectly, 30% or more of, respectively, the then outstanding
common shares or shares of common stock of the entity resulting from such
Business Combination or the combined voting power of the then outstanding voting
securities of such entity except to the extent that such ownership existed prior
to the Business Combination and (iii) at least a majority of the members of the
board of trustees (or board of directors) of the entity resulting from such
Business Combination were members of the Incumbent Board at the time of the
execution of the initial agreement, or of the action of the Board of Trustees of
the Parent, providing for such Business Combination; or

     4. Approval by the shareholders of the Parent of a complete liquidation or
dissolution of the Parent.

     For purposes of this Appendix A, the term "Parent" shall mean NSTAR, or, if
any entity shall own directly or indirectly through one or more subsidiaries,
more than 50% of the outstanding common shares of NSTAR, such entity, and (ii)
the term "Person" shall mean any individual, corporation, partnership, company,
limited liability company, trust or other entity, which term shall include a
"group" within the meaning of Section 13(d) of the Securities Act of 1934, as
amended.

                                      -16-

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