Document:

<PAGE>
                                                                    EXHIBIT 10-C

                             OTTER TAIL CORPORATION

               EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

                         Restated as of January 1, 2002

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                                TABLE OF CONTENTS

<Table>
<Caption>
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<S>                                                                                                       <C>
ARTICLE I--PURPOSE; EFFECTIVE DATE.........................................................................1

ARTICLE II--DEFINITIONS....................................................................................1

  2.1      Actuarial Equivalency...........................................................................1
  2.2      Beneficiary.....................................................................................1
  2.3      Board...........................................................................................1
  2.4      Cause...........................................................................................1
  2.5      Change in Control...............................................................................2
  2.6      Committee.......................................................................................2
  2.7      Continuing Director.............................................................................2
  2.8      Disability......................................................................................3
  2.9      Early Retirement Date...........................................................................3
  2.10     Employer........................................................................................3
  2.11     Executive Officer...............................................................................3
  2.12     Final Annual Salary.............................................................................3
  2.13     Final Average Earnings..........................................................................3
  2.14     Good Reason.....................................................................................3
  2.15     Normal Retirement Date..........................................................................4
  2.16     Participant.....................................................................................4
  2.17     Participation Agreement.........................................................................4
  2.18     Qualified Retirement Plan.......................................................................4
  2.19     Retirement......................................................................................5
  2.20     Salary..........................................................................................5
  2.21     Spouse..........................................................................................5
  2.22     Supplemental Retirement Benefit.................................................................5
  2.23     Target Retirement Percentage....................................................................5
  2.24     Years of Credited Service.......................................................................5
  2.25     Years of Participation..........................................................................5

ARTICLE III--PARTICIPATION AND VESTING.....................................................................6

  3.1      Eligibility and Participation...................................................................6
  3.2      Change in Employment Status.....................................................................6
  3.3      Vesting.........................................................................................6
  3.4      Suicide.........................................................................................7
</Table>

                                                                             (i)

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                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                        PAGE
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<S>                                                                                                       <C>
ARTICLE IV--BENEFITS--EXECUTIVE OFFICERS...................................................................7

  4.1      Eligibility.....................................................................................7
  4.2      Preretirement Survivor Benefit..................................................................7
  4.3      Postretirement Survivor Benefit.................................................................8
  4.4      Posttermination Survivor Benefit................................................................8

ARTICLE V--SUPPLEMENTAL RETIREMENT BENEFITS................................................................8

  5.1      Normal Retirement Benefit.......................................................................8
  5.2      Early Retirement Benefit........................................................................9
  5.3      Termination Benefit.............................................................................9
  5.4      Disability Retirement Benefit...................................................................9
  5.5      Payment of Benefits.............................................................................9
  5.6      Withholding; Payroll Taxes.....................................................................10
  5.7      Accelerated Distribution.......................................................................10
  5.8      Supplemental Survivor Benefit..................................................................10
  5.9      Payment to Guardian............................................................................11

ARTICLE VI--BENEFICIARY DESIGNATION.......................................................................11

  6.1      Beneficiary Designation........................................................................11
  6.2      Amendments.....................................................................................11
  6.3      No Participant Beneficiary Designation.........................................................11
  6.4      Effect of Payment..............................................................................12

ARTICLE VII--ADMINISTRATION...............................................................................12

  7.1      Committee; Duties..............................................................................12
  7.2      Agents.........................................................................................12
  7.3      Binding Effect of Decisions....................................................................12
  7.4      Indemnity of Committee.........................................................................12

ARTICLE VIII--CLAIMS PROCEDURE............................................................................13

  8.1      Claim..........................................................................................13
  8.2      Denial of Claim................................................................................13
  8.3      Review of Claim................................................................................13
  8.4      Final Decision.................................................................................13

ARTICLE IX--TERMINATION, SUSPENSION OR AMENDMENT..........................................................13

  9.1      Termination, Suspension or Amendment of Plan...................................................13
</Table>

                                                                            (ii)
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                                TABLE OF CONTENTS

<Table>
<Caption>
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<S>                                                                                                       <C>
ARTICLE X--MISCELLANEOUS..................................................................................14

  10.1     Unfunded Plan..................................................................................14
  10.2     Unsecured General Creditor.....................................................................14
  10.3     Trust Fund.....................................................................................14
  10.4     Nonassignability...............................................................................14
  10.5     Not a Contract of Employment...................................................................14
  10.6     Protective Provisions..........................................................................14
  10.7     Terms..........................................................................................15
  10.8     Captions.......................................................................................15
  10.9     Governing Law..................................................................................15
  10.10    Validity.......................................................................................15
  10.11    Notice.........................................................................................15
  10.12    Successors.....................................................................................15
</Table>

                                                                           (iii)

<PAGE>

                             OTTER TAIL CORPORATION

               EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

                       ARTICLE I--PURPOSE; EFFECTIVE DATE

         The purpose of this Executive Survivor and Retirement Plan (the "Plan")
is to provide survivor and retirement benefits for certain executive officers
and retirement benefits for other key management employees as designated by the
Board of Directors of Otter Tail Corporation (the "Corporation"). It is intended
that the Plan will aid in securing the goodwill, loyalty and efficiency of the
participating executive officers and other key management employees, and will
attract and retain executive officers and other key management employees of
outstanding competence. This Plan shall be effective as of November 1, 1983, and
is restated as of January 1, 2002.

         Plan Participants will receive benefits under this Plan as restated
January 1, 2002, or under the Plan as restated July 1, 1994. Some Participants
will receive a portion of benefits from each restated Plan. See Article
III--Participation and Vesting.

                             ARTICLE II--DEFINITIONS

         For purposes of this Plan, the following terms shall have the meanings
indicated, unless the context clearly indicates otherwise:

2.1      Actuarial Equivalency

         "Actuarial Equivalency" means an equivalent value or benefit determined
by an actuary selected by Employer using the actuarial tables and assumptions
being used to determine Actuarial Equivalency in the Qualified Retirement Plan
at the time the determination is made.

2.2      Beneficiary

         "Beneficiary" means the person, persons or entity entitled under
Article VII to receive any Plan benefits payable after a Participant's death.

2.3      Board

         "Board" means the Board of Directors of Employer.

2.4      Cause

         "Cause" shall mean termination by the Corporation of Employee's
employment based upon (a) the willful and continued failure by Employee
substantially to perform Employee's duties and obligations (other than any such
failure resulting from Employee's incapacity due to physical or mental illness
or any such actual or anticipated failure resulting from Employee's termination
for Good Reason) or (b) the willful engaging by Employee in misconduct which is
materially injurious to the Corporation, monetarily or otherwise. For purposes
of this Section 2.4, no action or failure to act on Employee's part shall be
considered "willful" unless done, or omitted to be done,

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by Employee in bad faith and without reasonable belief that such action or
omission was in the best interests of the Corporation.

2.5      Change in Control

         A "Change in Control" shall mean:

               (a) a change in control of a nature that would be required to be
         reported in response to Item 6(e) of Schedule 14A of Regulation 14A
         promulgated under the Securities Exchange Act of 1934, as amended (the
         "Exchange Act"), or successor provision thereto, whether or not the
         Corporation is then subject to such reporting requirement;

               (b) any "person" (as such term is used in Sections 13(d) and
         14(d) of the Exchange Act) is or becomes the "beneficial owner" (as
         defined in Rule 13d-3 promulgated under the Exchange Act), directly or
         indirectly, of securities of the Corporation representing 35% or more
         of the combined voting power of the Corporation's then outstanding
         securities;

               (c) the Continuing Directors (as defined at Section 2.7 hereof)
         cease to constitute a majority of the Corporation's Board of Directors;
         provided that such change is the direct or indirect result of a proxy
         fight and contested election or elections for positions on the Board of
         Directors; or

               (d) the majority of the Continuing Directors (as defined at
         Section 2.7 hereof) determine in their sole and absolute discretion
         that there has been a change in control of the Corporation.

2.6      Committee

         "Committee" means the Committee appointed to administer the Plan
pursuant to Article VII.

2.7      Continuing Director

         "Continuing Director" shall mean any person who is a member of the
Board of Directors of the Corporation, while such person is a member of the
Board of Directors, who is not an Acquiring Person (as hereinafter defined) or
an Affiliate or Associate (as hereinafter defined) of an Acquiring Person, or a
representative of an Acquiring Person or of any such Affiliate or Associate, and
who (a) was a member of the Board of Directors on the date of this Agreement as
first written above or (b) subsequently becomes a member of the Board of
Directors, if such person's nomination for election or initial election to the
Board of Directors is recommended or approved by a majority of the Continuing
Directors. For purposes of this Section 2.7: "Acquiring Person" shall mean any
"person" (as such term is used in Sections 13(d) and 14(d) of the Exchange Act)
who or which, together with all Affiliates and Associates of such person, is the
"beneficial owner" (as defined in Rule 13d-3 promulgated under the Exchange Act)
of 20% or more of the shares of Common Stock of the Corporation then
outstanding, but shall not include the Corporation, any subsidiary of the
Corporation or any employee benefit plan of the Corporation or of any subsidiary
of the Corporation or any entity holding shares of Common Stock organized,
appointed or established for, or pursuant to the terms of, any such plan; and
"Affiliate" and "Associate" shall have the respective meanings ascribed to such
terms in Rule 12b-2 promulgated under the Exchange Act.

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2.8      Disability

         "Disability" means the Participant is eligible to receive benefits for
permanent physical or mental disability under the Otter Tail Corporation's
Long-Term Disability Plan, or under a plan providing comparable benefits
sponsored by Employer, or under the Social Security rules for disability.
Disability will be based upon medical reports and/or other evidence satisfactory
to the Committee. In no event shall a Disability be deemed to occur or to
continue after a Participant's Normal Retirement Date.

2.9      Early Retirement Date

         "Early Retirement Date" means the date on which a Participant
terminates employment with Employer if such termination date occurs after the
first day of the month coincidental with or next following a Participant's
attainment of age fifty-five (55) and completion of ten (10) Years of Credited
Service, but prior to the participant's Normal Retirement Date.

2.10     Employer

         "Employer" means Otter Tail Corporation, a Minnesota corporation, or
any successor to the business thereof, and any affiliated or subsidiary
corporations designated by the Board.

2.11     Executive Officer

         "Executive Officer" means a Corporation level officer and the chief
operating officers of the Corporation's Energy Supply and Energy Delivery
business units.

2.12     Final Annual Salary

         "Final Annual Salary" means the base salary and annual bonus paid to a
Participant by Employer prior to a Participant's termination or death.

2.13     Final Average Earnings

         "Final Average Earnings" means the average of the Participants' total
cash payments (salary and annual incentive bonus) paid to the Participant during
the highest consecutive three and one-half (3.5) years in the ten (10) years
prior to retirement or termination.

2.14     Good Reason

         "Good Reason" shall mean the occurrence of any of the following events,
except for the occurrence of such an event in connection with the termination or
reassignment of Employee's employment by the Corporation for Cause (as defined
in Section 2.4 hereof), for Disability (as defined at Section 2.14 hereof) or
for death:

               (a) the assignment to Employee of employment responsibilities
         which are not of comparable responsibility and status as the employment
         responsibilities held by Employee immediately prior to a Change in
         Control;

               (b)    a reduction by the Corporation in Employee's base salary
         as in effect immediately prior to a Change in Control;

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               (c) an amendment or modification of the Corporation's incentive
         compensation program (except as may be required by applicable law)
         which affects the terms or administration of the program in a manner
         adverse to the interest of Employee as compared to the terms and
         administration of such program immediately prior to a Change in
         Control;

               (d) the Corporation's requiring Employee to be based anywhere
         other than within 50 miles of Employee's office location immediately
         prior to a Change in Control, except for requirements of temporary
         travel on the Corporation's business to an extent substantially
         consistent with Employee's business travel obligations immediately
         prior to a Change in Control;

               (e) except to the extent otherwise required by applicable law,
         the failure by the Corporation to continue in effect any benefit or
         compensation plan, stock ownership plan, stock purchase plan, stock
         incentive plan, bonus plan, life insurance plan, health-and-accident
         plan, or disability plan in which Employee is participating immediately
         prior to a Change in Control (or plans providing Employee with
         substantially similar benefits), the taking of any action by the
         Corporation which would adversely affect Employee's participation in,
         or materially reduce Employee's benefits under, any of such plans or
         deprive Employee of any material fringe benefit enjoyed by Employee
         immediately prior to such Change in Control, or the failure by the
         Corporation to provide Employee with the number of paid vacation days
         to which Employee is entitled immediately prior to such Change in
         Control in accordance with the Corporation's vacation policy as then in
         effect; or

               (f) the failure by the Corporation to obtain, as specified in
         Section 6(i) hereof, an assumption of the obligations of the
         Corporation to perform this Agreement by any successor to the
         Corporation.

2.15     Normal Retirement Date

         "Normal Retirement Date" means the first day of the month coincident
with or next following the Participant's attainment of age sixty-five (65).

2.16     Participant

         "Participant" means any employee who is participating or has
participated in this Plan as provided in Article III.

2.17     Participation Agreement

         "Participation Agreement" means the agreement filed by a Participant
which acknowledges assent to the terms of the Plan.

2.18     Qualified Retirement Plan

         "Qualified Retirement Plan" means the Otter Tail Corporation Pension
Plan or any successor defined benefit retirement income plan or plans maintained
by the Employer which qualifies under Section 401(a) of the Internal Revenue
Code. For purposes of determining benefits and actuarial equivalencies under the
Qualified Retirement Plan, the actuarial principles and assumptions which have
consistently applied to such plan(s) shall continue to be applied.

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2.19     Retirement

         "Retirement" means a Participant's separation from employment with the
Employer at the Participant's Early Retirement Date or Normal Retirement Date.

2.20     Salary

         "Salary" means the salary paid to a Participant during the calendar
year, before reduction, for any Section 125 benefits, for amounts deferred under
IRC Section 401(k) or any other deferral arrangement. Salary does not include
expense reimbursements, any form of noncash compensation or benefits, Employer
contributions to the Qualified Retirement Plan or the Corporation's 401(k) Plan,
or any other payments or benefits other than normal compensation.

2.21     Spouse

         "Spouse" means a Participant's wife or husband who is lawfully married
to the Participant at the time of the Participant's death.

2.22     Supplemental Retirement Benefit

         "Supplemental Retirement Benefit" means the benefit determined under
Article V of this Plan.

2.23     Target Retirement Percentage

         "Target Retirement Percentage" means the percentage of Final Average
Earnings which will be used as a target from which other forms of retirement
benefits are subtracted, as provided in Article V, to arrive at the amount of
the Supplemental Retirement Benefit actually payable to a Participant. This
percentage shall equal sixty-five percent (65%) multiplied by a fraction, the
numerator of which is the Participant's Years of Participation, not to exceed
fifteen (15), and the denominator of which is fifteen (15). The adjusted
Targeted Retirement Percentage shall be rounded to four (4) decimal places.

2.24     Years of Credited Service

         "Years of Credited Service" means the number of years of "Vesting
Service," as defined and calculated in the Qualified Retirement Plan, and shall
include all "Vesting Service" with the Corporation and affiliates.

2.25     Years of Participation

         "Years of Participation" means the number of complete years in which
the Participant has participated in this Plan. If a Participant terminates for
Good Reason (as defined at Section 2.14) within twenty-four (24) months of a
Change in Control, the Participant shall be granted three (3) extra years of
service.

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                     ARTICLE III--PARTICIPATION AND VESTING

3.1      Eligibility and Participation

               (a) ELIGIBILITY. Eligibility to participate in the Plan shall be
         limited to certain executive officers and other key management
         employees of Employer who are designated by the Committee.

               (b) PARTICIPATION. An Employee's participation in the Plan shall
         be effective upon the employee's notification of eligibility to
         participate, the Participant's completion of a Participation Agreement,
         and the Committee's acceptance of the Participation Agreement.
         Participation in the Plan shall continue until such time as the
         Participant terminates employment with the Employer, and as long
         thereafter as the Participant is eligible to receive benefits under
         this Plan.

               (c)    BENEFIT DETERMINATION.  All new Participants joining the
         Plan on or after January 1, 2002 will receive benefits under the Plan
         as restated January 1, 2002.

               All Participants who are at least age fifty-five (55) and/or are
         fully vested in the Plan as of December 31, 2001 will receive benefits
         under the Plan as restated July 1, 1994.

               Participants, as of December 31, 2001, who are partially vested
         as of such date will receive combined benefits from the Plan as
         restated July 1, 1994 and from the Plan as restated January 1, 2002
         based upon their vested percentage as of December 31, 2001. For
         example, a Participant with forty percent (40%) vesting at December 31,
         2001 would have a benefit based on forty percent (40%) of the benefits
         provided under the Plan as restated July 1, 1994, and sixty percent
         (60%) of the benefits provided under the Plan as restated January 1,
         2002. In addition, for such Participants, the denominator in
         determining the target benefit under Section 2.23 shall be the lesser
         of fifteen (15) or the number of years between the date the Participant
         began participation in this Plan and such Participant's sixty-second
         (62nd) birthday.

               However, in no case shall a vested or partially vested
         Participant's benefit be less than the benefit provided under this
         Plan's restated January 1, 2002 accrual formula.

3.2      Change in Employment Status

         If the Board determines that a Participant's employment performance is
no longer at a level which deserves reward through participation in this Plan,
but does not terminate the Participant's employment with the Employer,
participation herein and eligibility to receive benefits hereunder shall be
limited to the Participant's vested interest in such benefits as of the date
designated by the Committee.

3.3      Vesting

         Participants shall vest in the benefits under this Plan for which they
are eligible based on Years of Participation as follows:

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<Table>
<Caption>
               VESTED                          YEARS OF
             PERCENTAGE                      PARTICIPATION
         --------------------------------------------------------
<S>                                         <C>
                  0%                        Less than 5 years
                100                         5 or more
         ========================================================
</Table>

         Regardless of Years of Participation, after a Change in Control, all
Participants shall be one hundred percent (100%) vested. A Participant will also
be one hundred percent (100%) vested if the Participant dies while actively
employed by the Corporation.

3.4      Suicide

         The provisions of Article IV notwithstanding, no benefit shall be paid
to a Beneficiary if the Participant's death occurs as a result of suicide during
the twenty-four (24) successive calendar months beginning with the calendar
month following the commencement of the employee's participation in this Plan.
Similarly, no benefit shall be paid if death occurs within the twenty-four (24)
successive calendar months following commencement of an employee's participation
in the Plan if the Participant has made a material misrepresentation in any form
or document provided by the Participant to or for the benefit of Employer.

                    ARTICLE IV--BENEFITS--EXECUTIVE OFFICERS

4.1      Eligibility

         Survivor benefits under this Plan shall only be due and payable to
Participants who are or were Executive Officers at the time they became
Participants in the Plan, or who are later promoted to Executive Officer. For
purposes of this Section, any Participant designated as an Executive Officer
prior to January 1, 2002, shall remain an Executive Officer. In no event shall
Participants who are other key management employees be eligible for a survivor
benefit under this Article.

4.2      Preretirement Survivor Benefit

               (a) AMOUNT. If a Participant dies while employed by Employer or
         during a period of Disability, Employer shall pay a survivor benefit to
         the Participant's Beneficiary equal to four (4) times the Participant's
         Final Annual Salary.

               (b) FORM AND COMMENCEMENT OF BENEFIT PAYMENTS. The benefit
         payable under this Section shall be paid in monthly installments equal
         to one-sixth (1/6) of the Participant's Final Annual Salary until the
         benefit has been paid in full, without interest. Payments shall
         commence the first day of the month following the death of the
         Participant, or as soon thereafter as is practicable, and shall
         continue the first day of each month thereafter for the duration of the
         payment period.

               (c) COMMUTATION OF BENEFITS. The Committee may, in its sole
         discretion and at any time upon the request of a Beneficiary, provide
         for payment of the Actuarial Equivalent of the preretirement survivor
         benefit at such times and in such forms as it may deem appropriate.

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4.3      Postretirement Survivor Benefit

               (a) AMOUNT. If a Participant dies following Retirement, Employer
         shall pay a survivor benefit to the Participant's Beneficiary equal to
         the amount shown on the following schedule:

<Table>
<Caption>
         AGE AT DEATH                                    BENEFIT
         ----------------------------------------------------------------------
<S>                                         <C>
         55 through 64                      2 times Final Annual Salary
         65 through 69                      1-1/2 times Final Annual Salary
         70 through 75                      3/4 times Final Annual Salary
         Over 75                            3/8 times Final Annual Salary
         ======================================================================
</Table>

               (b) FORM AND COMMENCEMENT OF BENEFIT PAYMENT. The benefit payable
         under this Section shall be paid to the Beneficiary in a lump sum form
         on the first day of the month following the Participant's death, or as
         soon as practicable thereafter.

4.4      Posttermination Survivor Benefit

               (a) AMOUNT. If a vested Participant dies following termination,
         Employer shall pay a survivor benefit to the Participant's Beneficiary
         equal to the amount shown on the following schedule times the
         Participant's vested percentage:

<Table>
<Caption>
         AGE AT DEATH                                    BENEFIT
         ----------------------------------------------------------------------
<S>                                         <C>
         Less than 65                       2 times Final Annual Salary
         65 through 69                      1-1/2 times Final Annual Salary
         70 through 75                      3/4 times Final Annual Salary
         Over 75                            3/8 times Final Annual Salary
         ======================================================================
</Table>

               (b) FORM AND COMMENCEMENT OF BENEFIT PAYMENT. The benefit payable
         under this Section shall be paid to the Beneficiary in a lump sum form
         on the first day of the month following the Participant's death, or as
         soon as practicable thereafter.

                   ARTICLE V--SUPPLEMENTAL RETIREMENT BENEFITS

5.1      Normal Retirement Benefit

         If a Participant retires at the Normal Retirement Date, Employer shall
pay to the Participant a monthly Supplemental Retirement Benefit equal to the
Target Retirement Percentage multiplied by Final Average Earnings, less:

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<PAGE>

               (a)    The Participant's monthly primary Social Security benefit
         commencing at Retirement, and

               (b) The Participant's benefit in the form of a monthly
         single-life annuity under the Qualified Retirement Plan, calculated
         with a maximum of 30 Years of Credited Service, commencing at
         Retirement.

         This net amount shall be multiplied by the Participant's vested
percentage under Section 3.3.

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5.2      Early Retirement Benefit

         If a Participant retires at an Early Retirement Date, Employer shall
pay to the Participant the monthly Supplemental Retirement Benefit calculated
under Section 5.1 except:

               (a) The Target Retirement Percentage shall be reduced by the
         following percentage based on the Participant's age at Retirement [(1 -
         Reduction) x Target Retirement Percentage]:

<Table>
<Caption>
         AGE                                  REDUCTION
         --------------------------------------------------
<S>                                              <C>
         62 through 65                             0%
         61                                        5
         60                                       10
         59                                       15
         58                                       20
         57                                       25
         56                                       32
         55                                       39
         ==================================================
</Table>

               (b) The offset required by 5.1(a) shall be determined at
         Retirement using the Social Security Act in effect at Retirement and
         assuming zero (0) future earnings from the Participant's Early
         Retirement Date to the later of Early Retirement Date or Participant's
         attainment of age sixty-two (62).

5.3      Termination Benefit

         If a vested Participant terminates, Employer shall pay to the
Participant the monthly Supplemental Retirement Benefit calculated under Section
5.1 except:

               (a) The offset required by 5.1(a) shall be determined at
         termination using the Social Security Act in effect at termination and
         assuming earnings from the date of termination to the Participant's
         Normal Retirement Date are equal to the Participant's salary at
         termination; and

               (b) The offset required by 5.1(b) shall be the Participant's
         benefit under the Qualified Retirement Plan payable at age sixty-five
         (65).

5.4      Disability Retirement Benefit

         If a person terminates employment prior to Normal Retirement as a
result of Disability, the Employer shall pay to the Participant a Supplemental
Retirement Benefit commencing at the later of the Participant's sixty-second
(62nd) birthday or suspension of benefits under the Otter Tail Long-Term
Disability Program, equal to the amount the Participant would have received at
such time under the Early Retirement provisions of this Article. For purposes of
this calculation, Years of Credited Service and Years of Participation shall
continue to accrue during the period of Disability and the Participant's Final
Average Earnings will be calculated based on the Participant's earnings history
as of the date of the disability.

PAGE 10 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

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5.5      Payment of Benefits

               (a) FORM OF BENEFIT PAYMENT. The Supplemental Retirement Benefit
         shall be paid in the form of a monthly single life annuity with a
         fifteen (15) year certain period. If a Participant dies prior to
         completion of the fifteen (15) year payment period, any remaining
         payments shall be paid to the Participant's Beneficiary. Participants
         may select, as an alternative form, a fifty percent (50%) Joint and
         Survivor benefit which shall be the Actuarial Equivalent to the monthly
         single-life annuity with a fifteen (15) year certain period. For the
         Beneficiaries of executive officers, the remaining benefit, if any,
         shall be paid in addition to the benefits provided in 4.4. For
         Beneficiaries of other key management employees, this shall be the only
         benefit payable, if any.

               (b) COMMENCEMENT OF BENEFIT PAYMENTS. Benefits payable to a
         Participant under Sections 5.1 and 5.2 shall commence as soon as
         practicable after the appropriate application for benefits has been
         made but not later than sixty (60) days after all information necessary
         to calculate the benefit amount has been received by Employer. Benefits
         payable to a vested Participant under Section 5.3 shall commence on the
         first day of the month following the Participant's sixty-fifth (65th)
         birthday. All payments shall be made as of the first day of the month.

               (c) COMMUTATION OF BENEFITS. The Committee may, in its sole
         discretion and at any time upon the request of a Participant (or
         Beneficiary), provide for payment of the actuarial equivalent of the
         Supplemental Retirement Benefits at such times and in such form as it
         may deem appropriate.

5.6      Withholding; Payroll Taxes

         Employer shall withhold from payments made hereunder any taxes required
to be withheld from a Participant's wages for the federal or any state or local
government. However, a Beneficiary may elect not to have withholding for federal
income tax purposes pursuant to Section 3405(a)(2) of the Internal Revenue Code,
or any successor provision.

5.7      Accelerated Distribution

         Notwithstanding any other provision of the Plan, at any time within
twenty four (24) months of a Change in Control or any time following termination
of employment, a Participant shall be entitled to receive, upon written request
to the Committee, a lump sum distribution equal to ninety percent (90%) of the
Actuarial Equivalent of the Participant's unpaid benefits under this Plan on the
date on which the Committee receives the written request. The remaining unpaid
benefits shall be forfeited by the Participant and no benefit shall be payable
under Section 5.8. The amount payable under this Section shall be paid in a lump
sum within sixty-five (65) days following the receipt of the notice by the
Committee from the Participant.

5.8      Supplemental Survivor Benefit

         Benefits payable under this Section shall be applicable to all
Participants and shall be in addition to any benefit payable under Article IV.

PAGE 11 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

<PAGE>

               (a) PRETERMINATION. If a Participant dies while employed by the
         Corporation, the Participant's Beneficiary shall receive the actuarial
         equivalent of the Participant's accrued benefit in fifteen (15) annual
         installments.

               (b) POSTTERMINATION. If a Participant has terminated employment
         with the Corporation but benefits have not commenced under this Plan,
         the Participant's Beneficiary shall receive the Actuarial Equivalent of
         the Participant's benefit in fifteen (15) annual installments.

               (c) AFTER BENEFITS COMMENCE. If a Participant dies after the
         commencement of benefits under this Plan, the beneficiary shall receive
         (if any) a monthly benefit based on the form of benefit elected by the
         Participant.

5.9      Payment to Guardian

         If a Plan benefit is payable to a minor or a person declared
incompetent or to a person incapable of handling the disposition of his
property, the Committee may direct payment of such Plan benefit to the guardian,
legal representative or person having the care and custody of such minor,
incompetent or person. The Committee may require proof of incompetency,
minority, incapacity or guardianship as it may deem appropriate prior to
distribution of the Plan benefit. Such distribution shall completely discharge
the Committee and the Employer from all liability with respect to such benefit.

                       ARTICLE VI--BENEFICIARY DESIGNATION

6.1      Beneficiary Designation

         Each Participant shall have the right, at any time, to designate any
person or persons as Beneficiary (both primary as well as secondary) to whom
benefits under this Plan shall be paid as a result of the Participant's death
prior to complete distribution to Participant of the benefits due under the
Plan. Each Beneficiary designation shall be in a written form prescribed by the
Committee, and will be effective only when filed with the Committee during the
Participant's lifetime.

6.2      Amendments

         Any Beneficiary designation may be changed by a Participant without the
consent of any designated Beneficiary by the filing of a new Beneficiary
designation with the Committee. The filing of a new Beneficiary designation form
will cancel all Beneficiary designations previously filed. If a Participant's
Compensation is community property, any Beneficiary Designation shall be valid
or effective only as permitted under applicable law.

6.3      No Participant Beneficiary Designation

         In the absence of an effective Beneficiary Designation, or if all
designated Beneficiaries predecease the Participant or die prior to complete
distribution of the Participant's benefits, then Participant's designated
Beneficiary shall be deemed to be the person or persons surviving the
Participant in the first of the following classes in which there is a survivor,
share and share alike:

PAGE 12 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

<PAGE>

               (a)    The surviving Spouse;

               (b) The Participant's children, except that if any of the
         children predecease the Participant but leave issue surviving, then
         such issue shall take by right of representation the share their parent
         would have taken if living;

               (c)    The Participant's estate.

6.4      Effect of Payment

         The payment to the deemed Beneficiary shall completely discharge
Employer's obligations under this Plan.

                           ARTICLE VII--ADMINISTRATION

7.1      Committee; Duties

         This Plan shall be supervised by the Committee. The Committee shall
consist of at least three (3) individuals appointed by the Board. The Committee
shall have the authority to make, amend, interpret, and enforce all appropriate
rules and regulations for the administration of this Plan and decide or resolve
any and all questions, including interpretations of this Plan, as may arise in
connection with the Plan. The Committee shall also have the authority to
determine eligibility under the Plan. A majority vote of the Committee members
shall control any decision. Members of the Committee may be Participants under
this Plan.

7.2      Agents

         The Committee may, from time to time, employ other agents and delegate
to them such administrative duties as it sees fit, and may from time to time
consult with counsel who may be counsel to the Corporation.

7.3      Binding Effect of Decisions

         The decision or action of the Committee in respect of any question
arising out of or in connection with the administration, interpretation and
application of the Plan and the rules and regulations promulgated hereunder
shall be final and conclusive and binding upon all persons having any interest
in the Plan.

7.4      Indemnity of Committee

         The Corporation shall indemnify and hold harmless the members of the
Committee against any and all claims, loss, damage, expense or liability arising
from any action or failure to act with respect to this Plan, except in the case
of gross negligence or willful misconduct.

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<PAGE>

                         ARTICLE VIII--CLAIMS PROCEDURE

8.1      Claim

         Any person claiming a benefit, requesting an interpretation or ruling
under the Plan, or requesting information under the Plan shall present the
request in writing to the Committee which shall respond in writing within thirty
(30) days.

8.2      Denial of Claim

         If the claim or request is denied, the written notice of denial shall
state:

               (a) The reason for denial, with specific reference to the Plan
         provisions on which the denial is based.

               (b)    A description of any additional material or information
         required and an explanation of why it is necessary.

               (c)    An explanation of the Plan's claim review procedure.

8.3      Review of Claim

         Any person whose claim or request is denied or who has not received a
response within thirty (30) days may request review by notice given in writing
to the Committee. The claim or request shall be reviewed by the Committee who
may, but shall not be required to, grant the claimant a hearing. On review, the
claimant may have representation, examine pertinent documents, and submit issues
and comments in writing.

8.4      Final Decision

         The decision on review shall normally be made within sixty (60) days.
If an extension of time is required for a hearing or other special
circumstances, the claimant shall be notified and the time limit shall be one
hundred twenty (120) days. The decision shall be in writing and shall state the
reason and the relevant plan provisions. All decisions on review shall be final
and bind all parties concerned.

                ARTICLE IX--TERMINATION, SUSPENSION OR AMENDMENT

9.1      Termination, Suspension or Amendment of Plan

         The Board may, in its sole discretion, terminate or suspend this Plan
at any time or from time to time, in whole or in part. The Board may amend this
Plan at any time or from time to time. Any amendment may provide different
benefits or amounts of benefits from those herein set forth. However, no such
termination, suspension or amendment shall adversely affect the benefits of
Participants which have accrued prior to such action or the benefits of any
Beneficiary of a Participant who has previously died.

PAGE 14 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

<PAGE>

                            ARTICLE X--MISCELLANEOUS

10.1     Unfunded Plan

         This Plan is intended to be an unfunded plan maintained primarily to
provide deferred compensation benefits for a select group of management or
highly compensated employees.

10.2     Unsecured General Creditor

         In the event of Employer's insolvency, Participants and their
Beneficiaries, heirs, successors and assigns shall have no legal or equitable
rights, interest or claims in any property or assets of Employer, nor shall they
be Beneficiaries of, or have any rights, claims or interests in any life
insurance policies, annuity contracts or the proceeds therefrom owned or which
may be acquired by Employer. In that event, any and all of Employer's assets and
policies shall be, and remain, the general, unpledged, unrestricted assets of
Employer. Employer's obligation under the Plan shall be that of an unfunded and
unsecured promise of Employer to pay money in the future.

10.3     Trust Fund

         Employer shall be responsible for the payment of all benefits provided
under the Plan. At its discretion, Employer may establish one or more trusts,
with such trustees as the Board may approve, for the purpose of providing for
the payment of such benefits. Such trust or trusts may be irrevocable, but the
assets thereof shall be subject to the claims of Employer's creditors. To the
extent any benefits provided under the Plan are actually paid from any such
trust, Employer shall have no further obligation with respect thereto, but to
the extent not so paid, such benefits shall remain the obligation of, and shall
be paid by, Employer.

10.4     Nonassignability

         Neither a Participant nor any other person shall have any right to
commute, sell, assign, transfer, pledge, anticipate, mortgage or otherwise
encumber, transfer, hypothecate or convey in advance of actual receipt the
amounts, if any, payable hereunder, or any part thereof, which are, and all
rights to which are, expressly declared to be unassignable and nontransferable.
No part of the amounts payable shall, prior to actual payment, be subject to
seizure or sequestration for the payment of any debts, judgments, alimony or
separate maintenance owed by a Participant or any other person, nor be
transferable by operation of law in the event of a Participant's or any other
person's bankruptcy or insolvency.

10.5     Not a Contract of Employment

         The terms and conditions of this Plan shall not be deemed to constitute
a contract of employment between Employer and the Participant, and the
Participant (or the Participant's Beneficiary) shall have no rights against
Employer except as may otherwise be specifically provided herein. Moreover,
nothing in this Plan shall be deemed to give a Participant the right to be
retained in the service of Employer or to interfere with the right of Employer
to discipline or discharge the Participant at any time.

PAGE 15 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

<PAGE>

10.6     Protective Provisions

         A Participant will cooperate with Employer by furnishing any and all
information requested by Employer, in order to facilitate the payment of
benefits hereunder, and by taking such physical examinations as Employer may
deem necessary and taking such other action as may be requested by Employer.

10.7     Terms

         Wherever any words are used herein in the singular or in the plural,
they shall be construed as though they were used in the plural or the singular,
as the case may be, in all cases where they would so apply.

10.8     Captions

         The captions of the articles, sections and paragraphs of this Plan are
for convenience only and shall not control or affect the meaning or construction
of any of its provisions.

10.9     Governing Law

         The provisions of this Plan shall be construed and interpreted
according to the laws of the State of Minnesota.

10.10    Validity

         In case any provision of this Plan shall be held illegal or invalid for
any reason, said illegality or invalidity shall not affect the remaining parts
hereof, but this Plan shall be construed and enforced as if such illegal and
invalid provision had never been inserted herein.

10.11    Notice

         Any notice or filing required or permitted to be given to the Committee
under the Plan shall be sufficient if in writing and hand delivered, or sent by
registered or certified mail to any member of the Committee or the Secretary of
the Employer. Such notice shall be deemed given as of the date of delivery or,
if delivery is made by mail, as of the date shown on the postmark on the receipt
for registration or certification.

10.12    Successors

         The provisions of this Plan shall bind and inure to the benefit of
Otter Tail Corporation and its successors and assigns. The term successors as
used herein shall include any corporate or other business entity which shall,
whether by merger, consolidation, purchase or otherwise acquire all or
substantially all of the business and assets of Otter Tail Corporation, and
successors of any such corporation or other business entity.

PAGE 16 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN

<PAGE>

         IN WITNESS WHEREOF, and pursuant to resolution of the Board of
Directors of Otter Tail Corporation, such corporation has caused this instrument
to be executed by its duly authorized officers effective as of January 1, 2002.

                                                  OTTER TAIL CORPORATION

                                             By:  /s/ John MacFarlane
                                                  ------------------------------
                                                  Its Chief Executive Officer

                                          Dated:  December 17, 2001

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

PAGE 17 - EXECUTIVE SURVIVOR AND SUPPLEMENTAL RETIREMENT PLAN<PAGE>
                                                                    Exhibit 10-D

                             OTTER TAIL CORPORATION

                    DEFERRED COMPENSATION PLAN FOR DIRECTORS

                    As Amended and Restated October 22, 2001

<PAGE>

                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                           Page
                                                                                          Number
                                                                                          ------
<S>                                                                                       <C>
1.       PURPOSE                                                                             3

2.       PLAN PERIODS                                                                        3

3.       ADMINISTRATION                                                                      3

4.       PARTICIPATION                                                                       3

5.       DEFERRED COMPENSATION ACCOUNTS                                                      4

6.       PAYMENT                                                                             7

7.       ASSIGNMENT                                                                         11

8.       TERMINATION AND AMENDMENT                                                          11

         SCHEDULE A

         SCHEDULE B
</Table>

                                       2

<PAGE>

                             OTTER TAIL CORPORATION

                    DEFERRED COMPENSATION PLAN FOR DIRECTORS

                    As Amended and Restated October 22, 2001

         1. PURPOSE. The Plan is designed to provide a method of deferring
payment to non-employee Directors of all or part of their retainer and/or
meeting fees, as fixed from time to time by the Board of Directors, until
termination of their services on the Board.

         2. PLAN PERIODS. The first Plan Period shall commence upon the election
of Directors at the 1984 Annual Stockholders' Meeting and terminate on December
31, 1984. An additional Plan Period will commence on July 1, 2000 and continue
through December 31, 2000 for which a Director may elect to defer all or part of
his or her retainer and/or meeting fees for that period in the form of
restricted stock units, as provided in Section 5 hereof. Subsequent Plan Periods
shall relate to successive calendar years.

         3. ADMINISTRATION. The Plan shall be administered by a committee of the
Board of Directors designated by the Board to administer the Plan (the
"Committee"). The Committee shall be composed solely of two or more
"Non-Employee Directors," within the meaning of Rule 16b-3 under Section 16 of
the Securities Exchange Act of 1934. The Committee shall have the power to
interpret the Plan and, subject to its provisions, to make all determinations
necessary or desirable for the Plan's administration.

         4. PARTICIPATION.

         (a) An individual who serves as Director and is not otherwise employed
by the Corporation or any of its subsidiaries shall be eligible to participate
in the Plan if the Director elects to have payment of his or her retainer and/or
meeting fees in respect of a Plan Period deferred as provided herein.

                                       3
<PAGE>

         (b) The election shall be made by written notice on Schedule A to the
Plan filed with the Committee prior to the first day of such Plan Period or, in
the case of a Director who first becomes eligible during a Plan Period, not
later than 30 days after the Director first becomes eligible. In the case of a
Director who first becomes eligible during a Plan Period, the election to
participate shall apply only to compensation subsequent to making the election.
Each such election shall be irrevocable. An election on Schedule A shall remain
in effect until changed or rescinded. Prior to the beginning of any subsequent
Plan Period, a Participant may irrevocably elect in writing, by completing a new
Schedule A, to change an earlier election. Such new election shall become
effective on the first business day of the Plan Period following receipt by the
Committee of the new Schedule A. Notwithstanding the foregoing, a Participant
may elect, prior to July 1, 2000, to convert all or part of his or her Deferred
Cash Account into the Deferred Stock Account, as such Accounts are described in
Section 5 below. The number of whole and fractional restricted stock units
(computed to four decimal places) shall be determined as of July 3, 2000 by
dividing the amount of the Deferred Cash Account to be converted by the average
of the high and low sale prices of a Common Share of Otter Tail Corporation as
reported on the NASDAQ National Market System on July 3, 2000.

         5. DEFERRED COMPENSATION ACCOUNTS.

         (a) An account shall be established for each eligible, electing
Director (a "Participant") which shall be designated as the Participant's
Deferred Compensation Account. A Participant's Deferred Compensation Account
shall include a Deferred Cash Account and/or a Deferred Stock Account. The
Deferred Cash Account means the bookkeeping account of this Plan to which a
Participant's deemed cash allocations are credited and the Deferred Stock
Account means the bookkeeping account of this Plan to which a Participant's
deemed restricted stock unit

                                       4
<PAGE>

allocations are credited pursuant to this Plan. If a Participant elects to have
payment deferred of his or her retainer and/or meeting fees, the amount of the
retainer and/or meeting fees payable with respect to a Plan Period shall be
credited, (i) in monthly installments as of the last day of each month in the
Plan Period to which such retainer and/or meeting fees relate, for amounts
credited to the Participant's Deferred Cash Account and (ii) in quarterly
installments as of the last day of each calendar quarter in the Plan Period to
which such retainer and/or meeting fees relate, for amounts credited to the
Participant's Deferred Stock Account, subject to the provisions of Section 5(d).
The Corporation shall not be required to segregate any amounts credited to the
Deferred Compensation Accounts, which shall be established merely as an
accounting convenience. Amounts credited to the Deferred Compensation Accounts
shall at all times remain solely the property of the Corporation subject to the
claims of its general creditors and available for the Corporation's use for
whatever purpose desired.

         (b) The amounts credited to a Deferred Cash Account shall, in order to
alleviate the adverse effects of an inflationary economy, accrue interest each
month at an annual rate equal to the rate charged for prime commercial loans of
90-day maturity (based on actual numbers of days, 360 days to the year), plus 1%
as of the last business day of the month. Such interest shall be computed on the
average daily balance in the Deferred Cash Account during such month and shall
be credited to such Account and compounded as of the last day of such month.
Interest shall continue to accrue and be compounded on the unpaid balance in the
Deferred Cash Account until such Account is fully distributed.

         (c) The amounts credited to a Deferred Stock Account shall be credited
in the form of restricted stock units as of the last day of the calendar
quarter. The number of whole and fractional restricted stock units (computed to
four decimal places) credited to the Account shall

                                       5

<PAGE>

be determined by dividing the amount deferred to the Deferred Stock Account
during the quarter by the average of the high and low sale prices of a Common
Share of Otter Tail Corporation as reported on the NASDAQ National Market System
on the last business day of the quarter. At such times as cash dividends are
declared by the Corporation on its outstanding Common Shares, an amount shall be
credited to the Participant's Deferred Stock Account on the record date for such
dividend equal to the amount of dividends that would be paid if the restricted
stock units (including a fractional unit) were outstanding Common Shares on such
date ("Dividend Equivalents"). At the end of the calendar quarter in which such
Dividend Equivalents are credited to the Participant's Deferred Stock Account,
the Dividend Equivalents shall be converted to additional whole and fractional
restricted stock units (computed to four decimal places) in an amount determined
by dividing the amount of the Dividend Equivalents by the average of the high
and low sale prices of a Common Share of the Corporation as reported on the
NASDAQ National Market System on the last business day of the quarter. In the
event of a stock dividend or other distribution, recapitalization, stock split,
reverse stock split, reorganization, merger, consolidation, split-up, spin-off,
combination, repurchase or exchange of Common Shares or other securities of the
Corporation, issuance of warrants or other rights to purchase Common Shares or
other securities of the Corporation or other similar corporate transaction or
event that affects the Common Shares, the Committee shall make such adjustments
as it deems appropriate in the number of restricted stock units credited to a
Participant's Deferred Stock Account in order to prevent dilution or enlargement
of the Participant's benefits under the Plan.

         (d) If, prior to the end of a Plan Period, a Participant becomes an
employee of the Corporation or one of its subsidiaries or dies or ceases for any
reason to be a Director, or if the

                                       6
<PAGE>

effective date of participation by a Participant for any Plan Period shall be
other than the first day thereof, the Participant will be entitled to be
credited with that proportion of the annual retainer for the full Plan Period
which the number of days of his or her participation in the Plan during such
Plan Period bears to the total number of days in such Plan Period.

         6. PAYMENT.

         (a) Following termination of a Participant's service on the Board, the
Corporation shall distribute the entire amount accumulated in the Participant's
Deferred Compensation Account.

         (b) By written notice on Schedule A to the Plan filed with the
Committee, a Participant may elect to have distribution of his or her Deferred
Cash Account commence either (i) within 30 days after the date the Participant
ceases to be a Director of the Corporation, (ii) 12 months after the Participant
ceases to be a Director of the Corporation, or (iii) 24 months after the
Participant ceases to be a Director of the Corporation. Any such election, or
any change in such election (by such subsequent written notice to the
Committee), shall apply only to future deferrals. In the event no election is
made as to the commencement of a distribution, such distribution shall commence
within 30 days after the date the Participant ceases to be a Director of the
Corporation. The actual date that distribution shall commence shall be a date
within the appropriate period determined by the Committee in its sole
discretion.

         (c) By written notice on Schedule A to the Plan filed with the
Committee, a Participant may choose to receive the distribution of his or her
Deferred Cash Account in the form of (i) one lump-sum payment or (ii) monthly
distributions over a period selected by the Participant of up to 10 years. In
the event a lump-sum payment is made under the Plan, the amount then standing to
the Participant's credit in his or her Deferred Cash Account, including interest
at the rate provided in Section 5(b) to the date of distribution, shall be paid
to the Participant on the date

                                       7

<PAGE>

determined under Section 6(b). In the case of a distribution over a period of
years, the Corporation shall pay to the Participant, commencing on the date
determined under Section 6(b), monthly installments from the amount then
standing to the Participant's credit in his or her Deferred Cash Account,
including interest on the unpaid balance at the rate provided in Section 5(b) to
the date of distribution. The amount of each installment shall be determined by
dividing the then unpaid balance, plus accrued interest, in the Participant's
Deferred Cash Account by the number of installments remaining to be paid. If a
Participant does not make a choice as to the manner of distribution of his or
her Deferred Cash Account, such distribution shall be made in the form of
monthly installments paid over a five-year period. Notwithstanding the above and
subject to approval by the Committee, a Participant may at any time request, by
written notice to the Committee, to have the monthly payments scheduled to be
made to him or her within a tax year paid to him or her in one installment
within such year.

         (d) Distributions from the Deferred Stock Account shall be in Common
Shares of the Corporation. The Common Shares available for issuance under this
Plan shall be issued under, and in accordance with the terms of, the Otter Tail
Corporation 1999 Stock Incentive Plan. Upon distribution, one Common Share shall
be issued for each restricted stock unit, except that no fractional shares shall
be issued, and the Participant shall receive a cash payment in lieu of any
fractional share. By written notice on Schedule A to the Plan filed with the
Committee, a Participant may elect to have a distribution of his or her Deferred
Stock Account commence (i) within 30 days after the date the Participant ceases
to be a Director of the Corporation, (ii) 12 months after the Participant ceases
to be a Director of the Corporation or (iii) 24 months after the Participant
ceases to be a Director of the Corporation. Any such election, or any change in
such election (by subsequent written notice to the Committee), shall apply only
to future deferrals. In

                                       8
<PAGE>

the event no election is made as to the commencement of the distribution, such
distribution shall commence within 30 days after the date the Participant ceases
to be a Director of the Corporation. The actual date that the distribution shall
commence shall be a date within the appropriate period determined by the
Committee in its sole discretion.

         (e) By written notice on Schedule A to the Plan filed with the
Committee, a Participant may choose to receive the distribution of his or her
Deferred Stock Account in the form of (i) one lump-sum payment or (ii) annual
distributions over a period selected by the Participant of up to 10 years. If a
Participant does not make a choice as to the manner of distribution of his or
her Deferred Stock Account, such distribution shall be made in the form of a
lump-sum payment. In the event a lump-sum payment is made under the Plan, a
certificate representing the Common Shares payable for the whole number of
restricted stock units credited to the Participant's Deferred Stock Account
shall be delivered to the Participant or the Participant's Beneficiary, as the
case may be, along with cash in payment of any fractional share, on the date
determined under Section 6(d). In the case of a distribution over a period of
years, the Corporation shall pay to the Participant, commencing on the date
determined under Section 6(d), annual installments from the number of restricted
stock units then credited to the Participant's Deferred Stock Account, including
additional restricted stock units credited as a result of the deemed
reinvestment of Dividend Equivalents credited to the Participant's account. The
amount of each installment shall be determined by dividing the then unpaid
balance of restricted stock units by the number of installments remaining to be
paid. A certificate representing the whole number of Common Shares payable for
such installment shall be delivered to the Participant or the Participant's
Beneficiary, as the case may be, along with cash in payment of any fractional
share. The value of any fractional share shall be based upon the average of the
high and low sale prices

                                       9
<PAGE>

of a Common Share of the Corporation as reported on the NASDAQ National Market
System on the business day preceding the payment date. The Participant or the
Participant's Beneficiary, as the case may be, shall have no rights as a holder
of Common Shares unless and until a certificate for the shares is issued by the
Corporation.

         (f) In the event of a Participant's death, the balance of a
Participant's Deferred Cash Account or Deferred Stock Account, as the case may
be, shall be distributed to the Participant's Beneficiary(ies) over a period of
not more than five years or in a lump sum, in accordance with the Participant's
choice on Schedule B to the Plan filed with the Committee. Such distribution
shall commence within 30 days after the Participant's death, on a date within
such month to be determined by the Committee in its sole discretion. Additional
annual payments for distributions made over a period of more than one year shall
be made on the yearly anniversaries of such date. In the event of a
Participant's death after distribution of the Deferred Cash Account or Deferred
Stock Account, as the case may be, has commenced, any choice under this Section
6(f) shall not extend time of payment of such Account beyond the time when
distribution would have been completed if the Participant had lived. A
Participant may change Beneficiary designations by filing a subsequent Schedule
B with the Committee. If a Participant does not make a choice as to the manner
of distribution of his or her Deferred Cash Account or Deferred Stock Account,
as the case may be, in the event of death, any such distribution shall be made
as a lump-sum payment to his or her estate within 30 days after the
Participant's death.

         (g) Notwithstanding any other provision of the Plan, if the Committee
shall determine in its sole discretion that the time of payment of a
Participant's Deferred Compensation Account should be advanced because of
protracted illness or other undue hardship, then the Committee may advance the
time or times of payment (whether before or after the Director's retirement

                                       10

<PAGE>

date) only if the Committee determines that an emergency beyond the control of
the Participant exists and which would cause such Participant severe financial
hardship if the payment of such benefits were not approved. Any such
distribution for hardship shall be limited to the amount needed to meet such
emergency. A Participant who receives a hardship distribution may not reenter
the Plan for 12 months after the date of such distribution. Any distribution for
hardship under this Section 6(g) shall commence or be made within 30 days after
the Committee determines to make such hardship distribution.

         7. ASSIGNMENT. No benefit under the Plan shall in any manner or to any
extent be assigned, alienated, or transferred by any Participant or Beneficiary
or subject to attachment, garnishment, or other legal process.

         8. TERMINATION AND AMENDMENT. The Committee may terminate the Plan at
any time so that no further amounts shall be credited to Deferred Compensation
Accounts or may, from time to time, amend the Plan, without the consent of
Participants or Beneficiaries; provided, however, that no such amendment or
termination shall impair any rights which have accrued under the Plan.

                                       11

<PAGE>

                                                                      SCHEDULE A

                              IRREVOCABLE ELECTION

                                    under the
                             Otter Tail Corporation
                    Deferred Compensation Plan for Directors
                    As Amended and Restated October 22, 2001

         THIS IRREVOCABLE ELECTION is being made pursuant to the Otter Tail
Corporation Deferred Compensation Plan for Directors, As Amended and Restated
October 22, 2001 (the "Plan"). Any election under any Section specified below
which changes a prior election under the Plan shall apply only to subsequent
Plan Periods, as defined in the Plan. Terms used herein shall have the meanings
given to them in the Plan.

SECTION 1. DEFERRAL ELECTION.

         I hereby irrevocably elect to defer receipt of all or part of my
retainer and/or meeting fees pursuant to the terms of the Plan and this
Irrevocable Election, as indicated below:

                             % of retainer
                  ----------

                             % of meeting fees
                  ----------

SECTION 2. FORM OF PAYMENT.

         I hereby irrevocably elect to receive payment of the amounts deferred
in accordance with my election above and the terms of the Plan, in the form
indicated below:

                             Cash
                  ----------

                             Common Shares of Otter Tail Corporation. I
                  ---------- understand that no actual shares will be issued in
                             my name until I receive a distribution from the
                             Plan and, until such time, my Deferred Stock
                             Account will be credited with restricted stock
                             units and Dividend Equivalents, which will be
                             converted into additional restricted stock units,
                             as described in the Plan.

SECTION 3. TIMING OF DISTRIBUTION.

         I hereby irrevocably elect, in accordance with the terms of the Plan,
to have the distribution from my Deferred Cash Account and/or Deferred Stock
Account to commence or be made as follows:

                             within 30 days after I cease to be a Director of
                  ---------- the Corporation

                             12 months after I cease to be a Director of the
                  ---------- Corporation

                                       12

<PAGE>

                             24 months after I cease to be a Director of the
                  ---------- Corporation

         I understand that if no election is made, my distribution will commence
or be made within 30 days after I cease to be a Director of the Corporation.

SECTION 4. NUMBER OF DISTRIBUTIONS FROM DEFERRED CASH ACCOUNT.

         I hereby elect, in accordance with the terms of the Plan, to receive my
cash distributions from my Deferred Cash Account under the Plan, as indicated
below:

                             In one lump sum
                  ----------

                             In monthly installments over a period of ______
                  ---------- years (not to exceed 10 years)

         I understand that if no election is made, my cash distribution will be
made in monthly installments over a period of five years.

SECTION 5. NUMBER OF DISTRIBUTIONS FROM DEFERRED STOCK ACCOUNT.

         I hereby elect, in accordance with the terms of the Plan, to receive my
stock distributions from my Deferred Stock Account under the Plan, as indicated
below:

                             In one lump sum
                  ----------

                             In annual installments over a period of ______
                  ---------- years (not to exceed 10 years)

         I understand that if no election is made, my stock distribution will be
made in one lump-sum payment.

         I further understand that payment from my Deferred Stock Account will
be in the form of Common Shares of the Corporation.

SECTION 6. SIGNATURE.

         I understand that the above elections are subject to the terms of the
Plan. I acknowledge receipt of a copy of the Plan. I certify that my elections
are not being made in reliance upon any financial or tax advice given by the
Corporation. I understand that I should consult my own tax advisor as to the tax
consequences of my elections.

---------------------------------             ---------------------------------
Witness                                       Participant's Signature

                                              ---------------------------------
                                              Date

                                       13

<PAGE>

                                                                      SCHEDULE B

                             OTTER TAIL CORPORATION
                    DEFERRED COMPENSATION PLAN FOR DIRECTORS
                    As Amended and Restated October 22, 2001

SECTION 1. METHOD OF DISTRIBUTION IN CASE OF DEATH.

           In case of my death, I hereby elect, in accordance with the terms of
the Plan, to have the distribution of my Deferred Compensation Account paid to
my Beneficiary(ies) designated in Section 2 hereof as indicated below:

                    In one lump sum
         ----------
                    In annual installments over a period of ___ years (not to
         ---------- exceed five years)

           I understand that if no election is made, a lump-sum payment will be
made to my Beneficiary(ies) or estate within 30 days of my death. I further
understand that payments from my Deferred Stock Account, if any, will be in the
form of Common Shares of Otter Tail Corporation.

SECTION 2. DESIGNATION OF BENEFICIARY(IES).

         In the event of my death, I hereby designate the following individuals,
fiduciaries or other entities, either in their own right or in their
representative capacity, in the proportions and in the priority of interest
designated, to be the beneficiaries of any benefits owing to me, under the Plan.

         PRIMARY BENEFICIARIES - The following beneficiary(ies) shall receive
all benefits payable under the Plan in the event of my death in the proportions
designated hereunder. If any one or more of the primary beneficiaries designated
hereunder shall predecease me, such beneficiary's share(s) shall be divided
equally among the remaining primary beneficiaries.

<Table>
<Caption>
                                                      PROPORTIONATE
             NAME AND PRESENT ADDRESS               INTEREST OF PRIMARY              RELATIONSHIP TO
           OF PRIMARY BENEFICIARY(IES)                BENEFICIARY(IES)                   EMPLOYEE

<S>                                                 <C>                              <C>
                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------
</Table>

-------------------------                 ------------------------------
Date                                      Participant's Initials

                                       14

<PAGE>

         SECONDARY BENEFICIARIES - The following beneficiary(ies) shall receive
all benefits payable under the Plan in the event of my death in the proportions
designated hereunder only if all of my Primary Beneficiaries have predeceased
me. If all Primary Beneficiaries have predeceased me and if any one or more of
the Secondary Beneficiaries designated hereunder shall predecease me, such
Secondary Beneficiary's share(s) shall be divided equally among the Secondary
Beneficiaries.

<Table>
<Caption>
                                                      PROPORTIONATE
            NAME AND PRESENT ADDRESS                   INTEREST OF
                  OF SECONDARY                          SECONDARY                       RELATIONSHIP
                BENEFICIARY(IES)                      BENEFICIARY(IES)                  TO EMPLOYEE
<S>                                                 <C>                              <C>
                                                                      %
          ------------------------------             -----------------               -----------------

                                                                      %
          ------------------------------             -----------------               -----------------
</Table>

         ESTATE - In the event I have declined to designate a Beneficiary
hereunder or if all of the Beneficiaries that I have designated predecease me,
then all benefits payable under the Plan shall be payable to my Estate.

-------------------------                 ------------------------------
Witness                                   Participant's Signature

                                          ------------------------------
                                          Date

                                       15

<PAGE>

OTTER TAIL CORPORATION
DEFERRED COMPENSATION PLAN FOR DIRECTORS
                    As Amended and Restated October 22, 2001

                       ONE-TIME ELECTION TO RECEIVE ANNUAL

                    DISTRIBUTIONS FROM DEFERRED STOCK ACCOUNT

SECTION 1. ELECTION FOR ANNUAL INSTALLMENTS.

         I hereby irrevocably elect to receive my distributions from my Deferred
Stock Account in annual installments rather than in a lump-sum payment, over a
period of __ years, not to exceed 10 years, in accordance with the terms of the
Otter Tail Corporation Deferred Compensation Plan for Directors, As Amended and
Restated October 22, 2001.

         I understand that this election will apply to the amount credited to my
Deferred Stock Account on December 31, 2001 and amounts credited thereafter,
provided, however, that such election to receive annual installments shall apply
only to distributions from my Deferred Stock Account that occur after January 1,
2003 (and, therefore, any distribution from my Deferred Stock Account prior to
that date shall be made in one lump-sum payment).

SECTION 2. SIGNATURE.

         I understand that the above election is subject to the terms of the
Plan. I acknowledge receipt of a copy of the Plan. I certify that my election is
not being made in reliance upon any financial or tax advice given by the
Corporation. I understand that I should consult my own tax advisor as to the tax
consequences of my election.

-------------------------                 ------------------------------
Witness                                   Participant's Signature

                                                          , 2001
                                          ----------------

                                       16

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