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                                                                    EXHIBIT 10.2

                                     NSTAR
                    SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN
                     (RESTATED EFFECTIVE AUGUST 25, 1999)

SECTION 1.  PURPOSE; BACKGROUND

     The purpose of the NSTAR Supplemental Executive Retirement Plan (the
"Plan") is to reward certain key executive employees of NSTAR (the "Company")
and its affiliates through supplemental retirement payments.  This Plan is an
amendment, restatement and continuation of the Boston Edison Company
Supplemental Executive Retirement Plan.  The effective date of this restated
Plan is August 25, 1999.

SECTION 2.  ADMINISTRATION

     The Executive Personnel Committee (the "EPC") and the Retirement Committee
(the "RC"), each as defined in the NSTAR Pension Plan, will be responsible under
the Plan for carrying out their respective administrative and other duties as
set forth in the Plan.  In addition, the EPC has the full discretionary power
and authority to interpret the plan, settle all disputes which may arise in
connection with the Plan, and establish any claims procedures required by the
Employee Retirement Income Security Act of 1974, as amended from time to time.
The decisions, interpretations and determinations made by the EPC or the RC
relating to the Plan will be final and conclusive on all persons.
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     The Company agrees to indemnify and to defend to the fullest possible
extent permitted by law any member of the EPC and the RC (including any person
who formerly served as a member of the EPC or the RC) against all liabilities,
damages, costs and expenses (including attorneys' fees and amounts paid in
settlement of any claims approved by the Company) occasioned by any act or
omission to act in connection with the Plan.

SECTION 3.  PARTICIPANTS

     Participants in the Plan will be those key executive employees of the
Company and its affiliates selected from time to time by the EPC to participate
in plan benefits.

SECTION 4.  BENEFITS

     (A)  FULL BENEFIT.  Each Participant who attains his or her Full Benefit
Age (as hereinafter defined) while an employee of the Company or its affiliates
and who thereafter ceases to be an employee of the Company and its affiliates
will receive an annual benefit calculated as of the date he or she ceases to be
an employee of the Company and its affiliates, expressed as a single life
annuity, equal to the excess (if any) of (A) over (B),

          where (A) is the excess of (i) 60% of his or her Highest Average Total
          Compensation ( as hereinafter defined), over (ii) 50% of the
          Participant's Primary Social Security Benefit (as hereinafter
          defined), which excess is then multiplied by a fraction the numerator
          of which is his or her Full Years of Continuous Service (as
          hereinafter defined) at the time of his or her termination (which in
          no event shall exceed 20) and the denominator of which is 20; and
          where (B) is the sum of the lump sum benefits which the Participant
          would be entitled to receive at such time from the NSTAR Pension Plan
          (as from time to time amended) and the NSTAR Excess Benefit Plan (as
          from time to time amended), expressed as an actuarial equivalent
          single life annuity (as determined by the RC with reference to such
          actuarial factors as it shall select from time to time).

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For purposes of (B) above, it will be assumed that the Participant elected a
lump sum benefit under said NSTAR Pension and Excess Benefit Plans regardless of
the actual form of benefit elected by the Participant.

     (B)  REDUCED BENEFIT.  Each Participant who attains age 55 while an
employee of the Company or its affiliates, who completes five Full Years of
Continuous Service and who thereafter ceases to be an employee of the Company
and its affiliates (but prior to his Full Benefit Age) will receive a reduced
annual benefit calculated as of the date he or she ceases to be an employee of
the Company and its affiliates in the same manner as described in Section 4(a)
above for a full benefit, but reduced by an amount equal to .41666% multiplied
by the aggregate number of months between the date his or her benefit commences
and his or her Full Benefit Age.  A Participant who has not attained age 55 or
who has not completed five Full Years of Continuous Service, but who has entered
into a change in control agreement with the Company and whose age plus the
number of any additional years of service credited to him under said change in
control agreement for purposes of the Plan is 50 or more, will be considered to
have an accrued benefit under the Plan for purposes of said change in control
agreement, based upon his or her number of Full Years of Continuous Service and
calculated and reduced as of his or her termination date in the same manner as
described in the preceding provision of this Section 4(b).

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     (C)  PAYMENTS OF BENEFITS.  The annual benefit payable to a Participant
under Section 4(a) or (b) above will be paid as a single life annuity, a Spousal
Joint and Survivor Annuity (as hereinafter defined) or a Single Sum (as
hereinafter defined), as elected by the Participant in accordance with rules and
procedures established by the RC.

     (D)  BENEFIT DEFINITIONS.  For purposes of the Plan, the following terms
have the following meanings:

          (1)  HIGHEST AVERAGE TOTAL COMPENSATION means the average of the
          Participant's Total Compensation (as hereinafter defined) for the 36
          consecutive months in which the Participant had the highest Total
          Compensation.

          (2)  SINGLE SUM means a single payment of actuarial equivalent value
          to a single life annuity (as determined by the RC with reference to
          such actuarial factors as it shall select from time to time).

          (3)  FULL BENEFIT AGE means, for each Participant, age 62 or such
          other age as the EPC may determine for a Participant.
          (4)  PRIMARY SOCIAL SECURITY BENEFIT means the "Primary Social
          Security Benefit,"  as defined under the NSTAR Pension Plan (as from
          time to time amended), as determined by the RC.

          (5)  TOTAL COMPENSATION means, for any calendar month, the
          Participant's base compensation and annual bonus payments paid to the
          Participant during such calendar month by the Company or its
          affiliate, plus any amounts that would have been paid to the
          Participant during the calendar month by the Company or its affiliate
          as base compensation or annual bonus but for a salary reduction
          agreement in effect during such month under the NSTAR Deferred
          Compensation Plan, as from time to time amended, or pursuant to
          Sections 125 or 401(k) of the Internal Revenue Code of 1986 as
          amended.

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          (6)  SPOUSAL JOINT AND SURVIVOR ANNUITY means an annuity of actuarial
          equivalent value to a single life annuity (as determined by the RC
          with reference to such actuarial factors as it shall select from time
          to time), under which the Participant receives a reduced benefit
          during his or her lifetime, and following the Participant's death, 50%
          (or 66 2/3% or 100%, as elected by the Participant) of such reduced
          benefit is paid for the life of the person who was the Participant's
          spouse on the date benefits commenced to the Participant.

          (7)  FULL YEARS OF CONTINUOUS SERVICE means, for each Participant, the
          number of full years of continuous service with the Company and its
          affiliates, beginning with the date on which the individual becomes a
          Participant in the Plan, credited to the Participant for purposes of
          the Plan by the EPC, plus such other periods, if any, as the EPC shall
          determine.

SECTION 5.  PRE-RETIREMENT DEATH BENEFIT

     In the case of a Participant who dies after attaining age 55 and completing
five Full Years of Continuous Service, but prior to the commencement of his or
her benefits under Section 4 above, his or her surviving spouse, if any, will be
entitled to receive an annual benefit for his or her lifetime equal to the
benefit such spouse would have received if the Participant has ceased to be an
employee of the Company and its affiliates and commenced receiving his or her
benefit under the Plan immediately prior to his or her death under the 50%
Spousal Joint and Survivor Annuity form.  In lieu of such annual death benefit,
the surviving spouse may elect to receive his or her benefit as a Single Sum in
accordance with rules and procedures established by the RC.

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SECTION 6.  NO PLAN ASSETS

     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 its
obligations hereunder and all benefits payable under the Plan will be paid from
the general assets of the Company and its affiliates.  The Company or its
affiliates may, however, but is not required to, establish one or more  "grantor
trusts" of which the Company or its affiliate is treated as the owner under
subpart E, part I, subchapter J, chapter 1, subtitle A of the Internal Revenue
Code of 1986, as amended (a "grantor trust") and may deposit funds with the
trustee of the grantor trust sufficient to satisfy the benefits.  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 (as defined in
Appendix A attached to the Plan), 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 EPC 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 EPC prior to a Change of Control).

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SECTION 7.  PARTICIPANT'S RIGHTS; NO ASSIGNMENT

     A Participant's or beneficiary's rights to benefits under the Plan shall be
no greater than the rights of a general, unsecured creditor of the Company or
its affiliates, and shall not be assignable or subject to alienation,
anticipation, garnishment, attachment, or any other legal process by his
creditors.

SECTION 8.  NO CONTRACT OF EMPLOYMENT

     The Plan will not be deemed to constitute a contract of employment between
the Company or its affiliates and any Participant, or to be consideration for
the employment of any Participant.

SECTION 9.  APPLICATION OF ERISA

     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)(1) of the Employee Retirement Income
Security Act of 1974, as amended, and shall be administered in a manner
consistent with that intent.

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SECTION 10.  AMENDMENT OR TERMINATION

     This Plan may be amended or terminated at any time and in any respect by
the Company or the EPC; provided, however, that no amendment or termination
shall reduce or otherwise adversely affect the rights of a Participant or his or
her beneficiary to benefits accrued under the Plan immediately prior to such
amendment or termination without his or her prior written consent; and further
provided, 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 6.  Furthermore,
following a Change of Control, this Section 10 may not be amended.

SECTION 11.  GOVERNING LAW
     This Plan shall be governed by and construed under the laws of the
Commonwealth of Massachusetts, to the extent such laws are not preempted by
federal laws.

     IN WITNESS WHEREOF, NSTAR 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
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                                  Appendix A
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                              "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 any
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 considered as though such individual were a member of the
Incumbent Board, but

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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 any employee benefit plan (or
related trust) of the Parent or the Company or such

                                      -10-
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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.

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                                                                    EXHIBIT 10.3

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              SPECIAL SUPPLEMENTAL EXECUTIVE RETIREMENT AGREEMENT
                                    BETWEEN
                     BOSTON EDISON COMPANY (the "Company")
                                      AND
                        THOMAS J. MAY (the "Executive")
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     Effective as a sealed instrument under Massachusetts law this 13th day of
March, 1999.

     WHEREAS, the Executive and the Company previously entered into a Key
Executive Benefit Plan Agreement (the "KEBP Plan"); and

     WHEREAS, the Company has adopted the Boston Edison Supplemental Executive
Retirement Plan (the "SERP Plan"); and

     WHEREAS, the Company now wishes to provide the Executive with a benefit
(the "Maximum Benefit")  equal to the greater of the benefits provided under
either the KEBP Plan or the SERP Plan (collectively, the "Plans"), such Maximum
Benefit to be in lieu of any benefits payable under the Plans;

     NOW, THEREFORE, it is agreed as follows:

     1.  The Executive shall be entitled to the Maximum Benefit.  The "Maximum
Benefit" shall be the greater of the benefit that would have been payable under
applicable circumstances under either (but not both) the KEBP Plan or the SERP
Plan.  The Maximum Benefit shall be determined by the Company's actuary using
reasonable actuarial assumptions.  Payment of the Maximum Benefit shall be in
full satisfaction of any liability the Company may have had under the Plans.

     2.  The Executive will cooperate with the Company in taking any steps
necessary to implement this Agreement, including the completion of any election
forms and beneficiary designations.

     3.  This Agreement shall not be construed as modifying or amending the
Change In Control Agreement between the Executive and the Company.

     WITNESS OUR SIGNATURES AND SEALS:

THOMAS J. MAY (The "Executive")              WITNESS

     /s/Thomas J. May                       /s/Carol O'Rourke
     ----------------                       -----------------
     (signature)                            (signature)

BOSTON EDISON COMPANY (The "Company")

By:  Paul Jeannette
     --------------
     (print name)

     /s/Paul Jeannette
     -----------------
     (signature)

Title: Compensation Manager

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