EXHIBIT 10.8a ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN TABLE OF CONTENTS Page ARTICLE ONE - PREAMBLE . . . . . . . . . . . . . . . . . . . . . . . . 1 ARTICLE TWO - CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . 2 ARTICLE THREE - ELIGIBILITY AND PARTICIPATION . . . . . . . . . . . . . 3 ARTICLE FOUR - BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . 3 ARTICLE FIVE - PAYMENT OF BENEFITS . . . . . . . . . . . . . . . . . . 4 ARTICLE SIX - FUNDING . . . . . . . . . . . . . . . . . . . . . . . . . 5 ARTICLE SEVEN - ADMINISTRATION . . . . . . . . . . . . . . . . . . . . 5 ARTICLE EIGHT - AMENDMENT AND TERMINATION OF THE PLAN . . . . . . . . . 6 ARTICLE NINE - ASSIGNMENT . . . . . . . . . . . . . . . . . . . . . . . 6 ARTICLE TEN - WITHHOLDING . . . . . . . . . . . . . . . . . . . . . . . 7 ARTICLE ELEVEN - OTHER BENEFIT PLANS OF THE COMPANY . . . . . . . . . 7 ARTICLE TWELVE - MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . 7 ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN ARTICLE ONE PREAMBLE ARIZONA PUBLIC SERVICE COMPANY, hereinafter referred to as the "Company", has previously adopted the ARIZONA PUBLIC SERVICE COMPANY EMPLOYEES' RETIREMENT PLAN, hereinafter referred to as the "Retirement Plan". Subsequent to adoption of the Retirement Plan, the Company adopted THE SAVINGS PLAN FOR EMPLOYEES OF ARIZONA PUBLIC SERVICE COMPANY, hereinafter referred to as the "Savings Plan." The Retirement Plan and the Savings Plan are subject to the benefit and contribution limitations of Section 415 of the Internal Revenue Code, hereinafter referred to as the "Code". By reason of the limitations of Section 415 of the Code, and pursuant to the terms and provisions of the Retirement Plan and Savings Plan, a Participant's benefits under the Retirement Plan may be reduced from the benefits otherwise payable pursuant to the terms and provisions of the Retirement Plan (operative in the absence of the benefit and contribution limitations of Section 415). The Employee Retirement Income Security Act of 1974, hereinafter referred to as the "Act", permits establishment of an "excess benefit plan" for the purpose of paying retirement benefits to certain employees in excess of the benefits permitted to be paid under the Retirement Plan by reason of Section 415 of the Code. Accordingly, the Company hereby adopts the ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN, hereinafter referred to as the "Plan", effective January 1, 1982. ARTICLE TWO CONSTRUCTION Terms capitalized in this Plan shall have the meaning given in Article Two of the Retirement Plan, governing definitions and construction, except where such terms are otherwise defined in this Plan. If any provision of this Plan is determined for any reason to be invalid or unenforceable, the remaining provisions shall continue in full force and effect. All of the provisions of this Plan shall be construed and enforced according to the laws of the State of Arizona, and shall be administered according to the laws of such state, except as otherwise required by the Act, the Code or other applicable federal law. It is the intention of the Company that the Plan, as adopted by the Company, shall constitute an "excess benefit plan", as defined in Section (3)(36) of the Act. Benefits under this Plan shall be paid from the Company's general assets, and not from any trust fund or other segregated fund. This Plan shall be construed in a manner consistent with the Company's intention. ARTICLE THREE ELIGIBILITY AND PARTICIPATION The Executive Committee of the Board of Directors of the Company shall designate for participation in this Plan Employees of the Company who are Participants in the Retirement Plan. Designation of participants in this Plan may be made individually or by group designation, as determined by the Executive Committee. A participant in this Plan shall commence participation in this Plan as of the first day of the Plan Year in which his participation is determined. Such participation shall continue until the Executive Committee informs the participant in writing that he is no longer eligible for participation in this Plan. ARTICLE FOUR BENEFITS Any participant in this Plan who is a Participant in the Retirement Plan and who receives a benefit under the Retirement Plan, or such Retirement Plan Participant's surviving spouse or annuitant in the event of the Retirement Plan Participant's death, shall be entitled to a monthly benefit payable hereunder in accordance with this ARTICLE FOUR and with ARTICLE FIVE of this Plan, equal to the excess, if any, of (a) the amount of such participant's or surviving spouse's or annuitant's monthly benefit under the Retirement Plan computed under the provisions of the Retirement Plan without regard to the limitations of Section 5.8 of the Retirement Plan and Section 415 of the Code, over (b) the amount of such participant's or surviving spouse's or annuitant's monthly benefit actually payable under the Retirement Plan, computed under the provisions of the Retirement Plan and subject to Section 5.8 of the Retirement Plan and Section 415 of the Code. Benefits payable under this Plan shall be payable to a Plan participant or his spouse or other annuitant in the same manner and subject to all the same options, conditions, privileges and restrictions as are applicable to the benefits payable to the Plan participant, spouse or other annuitant of a Participant under the Retirement Plan, as though such benefits were payable as a part of the benefits being paid under the Retirement Plan, without, however, taking into account the limitations of Section 5.8 of the Retirement Plan and Section 415 of the Internal Revenue Code. An election of mode of payment under the Retirement Plan shall be a similar election under this Plan. ARTICLE FIVE PAYMENT OF BENEFITS Benefits under this Plan shall become payable when a Plan participant (or his spouse or annuitant) begins to receive payments under the Retirement Plan, and shall be payable by the Company in the same manner and at the same time as the Plan participant's (or his spouse's or annuitant's) benefits under the Retirement Plan are paid, as though such benefits were otherwise payable as a part of the benefits being paid under the Retirement Plan. ARTICLE SIX FUNDING Benefits under this Plan shall be payable from the general assets of the Company, and shall not be segregated in a trust fund or otherwise funded in any manner prior to the time of payment. No Plan participant shall have any vested rights hereunder nor any right hereunder to any specific assets of the Company. ARTICLE SEVEN ADMINISTRATION This Plan will be administered by the Committee which administers the Retirement Plan. With respect to administration of this Plan, the provisions of Article Eleven of the Retirement Plan, governing claims, Section 10.4 of the Retirement Plan, governing powers of the Committee, and Section 12.2 of the Retirement Plan, regarding scope of responsibility, shall be fully applicable. ARTICLE EIGHT AMENDMENT AND TERMINATION OF THE PLAN This Plan may be amended in whole or in part, prospectively or retroactively, by action of the Company's Board of Directors, and may be terminated at any time by action of the Company's Board of Directors; provided, however, that no such amendment or termination shall reduce any amount payable hereunder to the extent such amount accrued prior to the date of amendment or termination. ARTICLE NINE ASSIGNMENT No Plan participant or beneficiary of a Plan participant shall have any right to assign, pledge, hypothecate, anticipate or any way create a lien on any amounts payable hereunder. No amounts payable hereunder shall be subject to assignment or transfer or otherwise be alienable, either by voluntary or involuntary act, or by operation of law, or subject to attachment, execution, garnishment, sequestration or other seizure under any legal, equitable or other process, or be liable in any way for the debts or defaults of Plan participants and their beneficiaries. ARTICLE TEN WITHHOLDING Any taxes required to be withheld from payments to Plan participants hereunder shall be deducted and withheld by the Company. ARTICLE ELEVEN OTHER BENEFIT PLANS OF THE COMPANY Nothing contained in this Plan shall prevent a Plan participant prior to his death, or his spouse or other annuitant after his death, from receiving, in addition to any payments provided for under this Plan, any payments provided for under the Retirement Plan or under the Savings Plan, or which would otherwise be payable or distributable to him, his surviving spouse or annuitant under any plan or policy of the Company or otherwise. Nothing in this Plan shall be construed as preventing the Company or any of its subsidiaries from establishing any other or different plans providing for current or deferred compensation for employees. ARTICLE TWELVE MISCELLANEOUS Nothing contained in this Plan shall be construed as a contract of employment between the Company and an employee, or as a right of any employee to be continued in the employment of the Company, or as a limitation of the right of the Company to discharge any of its employees, with or without cause. All of the provisions of this Plan shall be binding upon all persons who shall be entitled to any benefit hereunder, their heirs and personal representatives. IN WITNESS WHEREOF, ARIZONA PUBLIC SERVICE COMPANY has signed and sealed this instrument the 17th day of DECEMBER, 1982. ARIZONA PUBLIC SERVICE COMPANY By Keith L. Turley -------------------------------------------- Its Chairman of the Board ---------------------------------- "Company" Attest: By William T. Quinsler ----------------------------- Its Secretary ------------------------- FIRST AMENDMENT TO THE ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN ARIZONA PUBLIC SERVICE COMPANY, hereinafter referred to as the "Company," has previously adopted the ARIZONA PUBLIC SERVICE COMPANY EMPLOYEES' RETIREMENT PLAN, hereinafter referred to as the "Retirement Plan." Subsequent to adoption of the Retirement Plan, the Company adopted THE SAVINGS PLAN FOR EMPLOYEES OF ARIZONA PUBLIC SERVICE COMPANY, hereinafter referred to as the "Savings Plan." The Company previously adopted the ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN, hereinafter referred to as the "Plan," effective January 1, 1982. By this First Amendment, the Company intends to amend the Plan to include bonuses in pensionable compensation under the Plan. 1. This First Amendment to the Plan shall be effective January 1, 1986. Any provision of the Plan not amended by this First Amendment to the Plan shall be considered to remain in full force and effect. 2. This First Amendment shall affect the benefits under this Plan for employees becoming entitled to benefits under this Plan on and after January 1, 1986. The benefits of any employees for whom benefits have commenced under this Plan prior to such date shall be determined in accordance with the terms and provisions of the Plan in effect before this First Amendment. 3. Article Four of the plan is hereby amended and restated in its entirety to provide as follows: "ARTICLE FOUR BENEFITS Any participant in this Plan who is a participant in the Retirement Plan and who receives a benefit under the Retirement Plan, or such Retirement Plan Participant's surviving spouse or annuitant in the event of the Retirement Plan Participant's death, shall be entitled to a monthly benefit payable hereunder in accordance with this ARTICLE FOUR and with ARTICLE FIVE of this Plan, equal to the excess, if any, of (a) the amount of such Participant's or surviving spouse's or annuitant's monthly benefit under the Retirement Plan (1) computed under the provisions of the Retirement Plan without regard to the limitations of Section 415 of the Code and the corresponding provisions of the Retirement Plan (as of January 1, 1986, set forth in Section 5.10 of the Retirement Plan) and (2) computed as though bonuses and incentive payments payable to salaried Employees are taken into account under the Retirement Plan in determining Average Monthly Compensation and Compensation and are not excluded from consideration in such determination, over (b) the amount of such Participant's or surviving spouse's or annuitant's monthly benefit actually payable under the Retirement Plan, computed under the provisions of the Retirement Plan and subject to Section 415 of the Code and Section 5.10 of the Retirement Plan. Benefits payable under this Plan shall be payable to a Plan participant or his spouse or other annuitant in the same manner and subject to all the same options, conditions, privileges and restrictions as are applicable to the benefits payable to the Plan participant, spouse or other annuitant of a Participant under the Retirement Plan, as though such benefits were payable as a part of the benefits being paid under the Retirement Plan; provided that such payment shall be separate from payment under the Retirement Plan and may be paid on a different day of the month than the day on which Retirement Plan benefit payments are made. An election of mode of payment under the Retirement Plan shall be a similar election under this Plan." 4. Except as amended by this First Amendment, the Company hereby ratifies the Plan in its entirety. IN WITNESS WHEREOF, ARIZONA PUBLIC SERVICE COMPANY has signed and sealed this instrument the 20th day of September, 1986. ARIZONA PUBLIC SERVICE COMPANY By Keith L. Turley ------------------------------- Its Chairman & CEO ------------------------------ "Company" ATTEST: By Faye Widenmann ------------------------------- Its Secretary --------------------------- SECOND AMENDMENT TO THE ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN Effective January 1, 1982, ARIZONA PUBLIC SERVICE COMPANY (the "Company") adopted the ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN (the "Plan"). The Plan was thereafter amended on September 30, 1986. By this instrument, the Company intends to amend the Plan to provide eligible employees with the benefits attributable to compensation in excess of $200,000.00, which may not be taken into account for purposes of the qualified pension and profit sharing plans maintained by the Company as a result of recent amendments to the Internal Revenue Code of 1986, as amended. 1. This amendment shall amend only those provisions set forth herein, and those provisions not amended hereby shall remain in full force and effect. 2. Article Four of the Plan is hereby amended and restated in its entirety to provide as follows: ARTICLE FOUR BENEFITS Subject to ARTICLE SIX, any participant in the Plan who is a Participant in the Retirement Plan and who receives a benefit under the Retirement Plan, or such participant's surviving spouse or annuitant in the event of the participant's death, shall be entitled to a monthly benefit payable hereunder in accordance with this ARTICLE FOUR and with ARTICLE FIVE of the Plan, equal to the excess, if any, of (a) the amount of such participant's or surviving spouse's or annuitant's monthly benefit under the Retirement Plan computed (i) under the provisions of the Retirement Plan without regard to that plan's exclusion of bonuses or incentive payments payable to the participant or to the limitations on the amount of "Compensation" that may be taken into account under the Retirement Plan under Section 401(a)(17) of the Code and without regard to the provisions of Section 5.9 of the Retirement Plan and Section 415 of the Code, over (b) the amount of such participant's or surviving spouse's or annuitant's monthly benefit actually payable under the Retirement Plan, as determined under the provisions of the Retirement Plan, including the exclusion of bonuses and incentive payments payable to the participant and the limitations on the amount of "Compensation" that may be taken into account under the Retirement Plan under Code Section 401(a)(17) and the provisions of Section 5.9 of the Retirement Plan and Section 415 of the Code. Benefits payable under the Plan shall be payable to a Plan participant or his spouse or other annuitant in the same manner and subject to all the same options, conditions, privileges and restrictions as are applicable to the benefits payable to the Plan participant, spouse or other annuitant of a Participant under the Retirement Plan, as though such benefits were payable as a part of the benefits being paid under the Retirement Plan, without, however, taking into account the Retirement Plan's exclusion of bonuses and incentive payments payable to the participant, the limitation on the "Compensation" that may be taken into account under the Retirement Plan under Code Section 401(a)(17) and the provisions of Section 5.9 of the Retirement Plan and Section 415 of the Code. An election of mode of payment under the Retirement Plan shall constitute an election of a similar mode of payment under this Plan. 3. This Amendment shall be effective as of January 1, 1989. Except as amended hereby, the Company hereby ratifies the Plan as adopted and thereafter amended. Dated: July 24, 1990. ARIZONA PUBLIC SERVICE COMPANY By Leslie N. Brockhurst -------------------------------------- Its VP - Human Resources ---------------------------------- "Company" THIRD AMENDMENT TO THE ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN Effective January 1, 1982, ARIZONA PUBLIC SERVICE COMPANY (the "Company") adopted the ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN (the "Plan"). The Plan was thereafter amended on September 30, 1986 and July 24, 1990. By this instrument, the Company intends to amend the Plan to include deferred compensation as pension earnings for purposes of calculating the participant's benefit under the Plan and to clarify the inclusion of bonuses and incentive payments as pension earnings. 1. This Amendment shall amend only those provisions set forth herein, and those provisions not amended hereby shall remain in full force and effect. 2. Article Four of the Plan is hereby amended and restated in its entirety to provide as follows: ARTICLE FOUR BENEFITS Subject to ARTICLE SIX, any participant in the Plan who is a participant in the Retirement Plan and who receives a benefit under the Retirement Plan, or such participant's surviving spouse or annuitant in the event of the participant's death, shall be entitled to a monthly benefit payable hereunder in accordance with this ARTICLE FOUR and with ARTICLE FIVE of the Plan, equal to the excess, if any, of (a) the amount of such participant's or surviving spouse's or annuitant's monthly benefit under the Retirement Plan computed under the provisions of the Retirement Plan but (i) including "Compensation" deferred by the participant under the Company's deferred compensation plan; (ii) subject to the limitations set forth below, including as "Compensation" cash payments made to the participant pursuant to bonus or incentive plans maintained by the Company for employees generally; and (iii) including "Compensation" in excess of the amount allowed to be taken into account under Section 401(a)(17) of the Code and (iv) without regard to the provisions of Section 5.9 of the Retirement Plan and Section 415 of the Code, over (b) the amount of such participant's or surviving spouse's or annuitant's monthly benefit actually payable under the Retirement Plan, as determined under the provisions of the Retirement Plan, including the exclusion of the participant's deferred compensation, the exclusion of bonus and incentive payments payable to the participant, the limitation on the amount of "Compensation" that may be taken into account under the Retirement Plan under Code Section 401(a)(17) and the provisions of Section 5.9 of the Retirement Plan and Section 415 of the Code. For purposes of the foregoing determination, non-cash bonus or incentive payments, bonus or incentive payments which are not "year-end" bonus or incentive payments, and bonuses or incentive payments under individual agreements between the Company and a participant shall be disregarded. In addition, cash payments made under bonus or incentive plans maintained by the Company for employees generally shall be disregarded to the extent that such payments exceed the maximum amount that the Human Resources Committee of the Board, as successor hereunder to the Executive Committee, determines, in its discretion, from time to time, may be taken into account under the Plan as "Compensation." The Human Resources Committee may differentiate among various groups of employees in establishing the maximum bonus or incentive payments that may be taken into account under the Plan. Benefits payable under the Plan shall be payable to a Plan participant or his spouse or other annuitant in the same manner and subject to all the same options, conditions, privileges and restrictions as are applicable to the benefits payable to the Plan participant, spouse or other annuitant of a Participant under the Retirement Plan, as though such benefits were payable as a part of the benefits being paid under the Retirement Plan. An election of mode of payment under the Retirement Plan shall constitute an election of a similar mode of payment under this Plan. 3. ARTICLE SEVEN is hereby amended in its entirety to read as follows: ARTICLE SEVEN ADMINISTRATION The Plan will be administered by the Administrative Committee that administers the Retirement Plan. With respect to administration of the Plan, except as otherwise provided in this ARTICLE SEVEN, the provisions of Article Eleven of the Retirement Plan governing claims, Section 10.4 of the Retirement Plan governing powers of the Administrative Committee, and Section 12.2 of the Retirement Plan regarding scope of responsibility, shall be fully applicable. Notwithstanding any provision to the contrary herein, the Human Resources Committee shall have the sole and absolute discretion to determine whether a bonus or incentive payment made to a participant constitutes "Compensation" for purposes of ARTICLE FOUR of the Plan. 4. This Amendment shall be effective as of January 1, 1992. Except as amended hereby, the Company hereby ratifies the Plan as adopted and thereafter amended. DATED: February 13, 1992. ARIZONA PUBLIC SERVICE COMPANY By: J.B. Norberg -------------------------------------- Its Executive Vice President and --------------------------------- Chief Financial Officer ---------------------------------