Document:

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                                                                  Exhibit 10.48b

                        PINNACLE WEST CAPITAL CORPORATION

                           SUPPLEMENTAL EXCESS BENEFIT

                                 RETIREMENT PLAN
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                                TABLE OF CONTENTS

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<S>                                                                         <C>
ARTICLE ONE - PREAMBLE.........................................................1

ARTICLE TWO - CONSTRUCTION.....................................................2

ARTICLE THREE - ELIGIBILITY AND PARTICIPATION..................................2

ARTICLE FOUR - BENEFITS........................................................4

ARTICLE FIVE - PAYMENT OF BENEFITS.............................................9

ARTICLE SIX - COORDINATION OF BENEFITS........................................10

ARTICLE SEVEN - FUNDING.......................................................11

ARTICLE EIGHT - ADMINISTRATION................................................12

ARTICLE NINE - AMENDMENT AND TERMINATION OF THE PLAN..........................12

ARTICLE TEN - ASSIGNMENT......................................................12

ARTICLE ELEVEN - WITHHOLDING..................................................13

ARTICLE TWELVE - OTHER BENEFIT PLANS OF THE COMPANY...........................13

ARTICLE THIRTEEN - MISCELLANEOUS..............................................13

ARTICLE FOURTEEN - EFFECTIVE DATE.............................................14
</TABLE>

                                       i
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                        PINNACLE WEST CAPITAL CORPORATION

                   SUPPLEMENTAL EXCESS BENEFIT RETIREMENT PLAN

                                   ARTICLE ONE

                                    PREAMBLE

            Effective January 1, 1987, PINNACLE WEST CAPITAL CORPORATION (the
"Company") adopted the PINNACLE WEST CAPITAL CORPORATION SUPPLEMENTAL EXCESS
BENEFIT RETIREMENT PLAN (the "Plan") for the purpose of paying retirement
benefits to certain employees in excess of the benefits permitted to be paid
under the Pinnacle West Capital Corporation Retirement Plan (the "Retirement
Plan") by reason of Section 415 of the Internal Revenue Code (the "Code"). The
Plan was thereafter amended several times to provide additional benefits,
thereby changing the Plan from an "excess benefit plan" under the Employee
Retirement Income Security Act of 1974, as amended (the "Act"), to a "top hat"
plan under the Act.

            Effective January 1, 1982, ARIZONA PUBLIC SERVICE COMPANY ("APS")
adopted the ARIZONA PUBLIC SERVICE COMPANY SUPPLEMENTAL EXCESS BENEFIT
RETIREMENT PLAN (the "APS Plan") for the purpose of paying retirement benefits
to certain employees in excess of the benefits permitted to be paid under the
Arizona Public Service Company Employees' Retirement Plan (the "APS Retirement
Plan") by reason of Section 415 of the Code. The Plan was thereafter amended
several times to provide additional benefits, thereby changing the Plan from an
"excess benefit plan" under the Act to a "top hat" plan under the Act.

            Effective January 1, 2000, the Company and APS amended and restated
the Plan and the APS Plan to merge the APS Plan into this Plan and to make other
technical changes. The Plan was amended several times thereafter. By this
amendment and restatement, the Company intends to amend the Plan to add a new
benefit structure.

                                       1
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                                   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 to be invalid or unenforceable for any reason, 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 "unfunded plan of deferred compensation for a
select group of management and highly compensated employees" within the meaning
of Sections 201(2) and 301(3) 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

            Employees of the Company or its Affiliates who are members of a
select group of management or highly compensated employees, as determined by the
Human Resources Committee of the Board of Directors of the Company, in its
discretion, and from time to time, shall be eligible to participate in the Plan
if they satisfy the eligibility requirements of Section 3(a) or Section 3(b).

            (a) Eligible Employees who are officers of the Company or an
Affiliate which is a participating employer under the Retirement Plan shall be
entitled to the benefits described in Section 4(a).

                                       2
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            (b) Eligible Employees of the Company or an Affiliate which is a
participating employer under the Retirement Plan who are not officers, who are
designated for participation by the Human Resources Committee of the Company's
Board of Directors and who are participants in the Retirement Plan shall be
entitled to the benefits described in Section 4(b). The Human Resources
Committee may make its designations under this Section 3(b) by individual
designation or by group designation.

            A participant shall commence participation in this Plan as of the
first day of the Plan Year in which he or she becomes a participant pursuant to
this ARTICLE THREE or the first day of his or her employment with the Company or
an Affiliate which is a participating employer under the Retirement Plan,
whichever is later. Such participation shall continue until the earlier of the
date on which the participant no longer satisfies the requirements for
participation under Section 3(a) or Section 3(b) or the date on which the Human
Resources Committee informs the participant in writing that he or she is no
longer eligible to participate in this Plan.

            Notwithstanding the foregoing, if the status of a participant
changes for reasons other than termination of employment with the Company or an
Affiliate which is a participating employer under the Retirement Plan, so that
he or she no longer is eligible to participate in the Plan, his or her
participation in the Plan shall cease but his or her benefit under this Plan as
of the date of his or her change of status shall not be canceled or distributed,
but shall be determined upon his or her termination of employment with the
Company or an Affiliate.

                                       3
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                                  ARTICLE FOUR

                                    BENEFITS

      (a) Section 3(a) Participants.

            (1) Subject to ARTICLE SEVEN, a participant who is eligible under
Section 3(a) and who is a Group A Participant under the Retirement Plan shall be
entitled to a monthly benefit equal to the lesser of (i) or (ii), reduced by
(iii), where

            (i) Equals three percent (3%) of the participant's Average Monthly
      Compensation multiplied by the participant's Years of Service, not to
      exceed ten (10) Years of Service, plus two percent (2%) of the
      participant's Average Monthly Compensation multiplied by the participant's
      Years of Service in excess of ten (10) Years of Service,

            (ii) Equals sixty percent (60%) of the participant's Average Monthly
      Compensation, and

            (iii) Equals the amount of such participant's monthly benefit
      determined under the terms of the Retirement Plan and payable in
      accordance with Section 6.2 of the Retirement Plan.

            (2) Subject to ARTICLE SEVEN, a participant who is eligible under
Section 3(a) and who is a Group B Participant under the Retirement Plan shall be
entitled to a monthly benefit equal to the sum of (i) and (ii), where

            (i) Equals the benefit determined under the formula set forth above
      in this Section 4(a)(1) for a Group A Participant in the Retirement Plan
      based on the participant's Years of Service as of March 31, 2003 and his
      or her Average Monthly Compensation as of the date of determination. Years
      of Service as of March 31, 2003 shall equal his or her full Years of
      Service as of such date plus a partial Year of Service equal to the lesser
      of one (1) or a fraction, the numerator of which is the participant's
      Hours of

                                       4
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      Service earned during the period beginning on the day after the last day
      of his or her Computation Period ending prior to March 31, 2003 and ending
      on March 31, 2003, and the denominator of which is 1,000, and

            (ii) Equals the monthly benefit for life payable at Normal
      Retirement Age which is the Actuarial Equivalent of a lump sum benefit
      equal to the participant's Supplemental Retirement Account Balance minus
      the participant's Retirement Account Balance under the Retirement Plan.

            (3) Subject to ARTICLE SEVEN, a participant who is eligible under
Section 3(a) and who is a Group C Participant under the Retirement Plan shall be
entitled to a monthly benefit equal to the Actuarial Equivalent of a lump sum
benefit equal to (i) reduced by (ii), where

            (i) Equals the participant's Supplemental Retirement Account
      Balance, and

            (ii) Equals the participant's Retirement Account Balance under the
      Retirement Plan.

            A participant's Supplemental Retirement Account Balance shall be a
notional account credited with Monthly Retirement Account Balance Credits and
Interest Credits. For purposes of this Plan, Monthly Retirement Account Balance
Credits shall be determined under the general methodology set forth in the
Retirement Plan based on the participant's Monthly Compensation for the month
but using the following chart; provided that, except for a Group C Participant,
a participant shall not receive a Monthly Retirement Account Balance Credit
after he or she is credited with more than twenty-five (25) Years of Service,
with twenty-five (25) Years of Service defined as twenty-five (25) full twelve
(12) months periods in duration:

                                       5
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<Table>
<Caption>
                                                             Percent of Monthly
                           Age at End of Plan Year in        Compensation Contribution
                           Which Month Occurs                Rate
                           ------------------                ----
<S>                                                          <C>
                           Less than 35                      12%
                           35-39                             14%
                           40-44                             16%
                           45-49                             20%
                           50-54                             24%
                           55 and over                       28%
</Table>

            For purposes of this Section 4(a), Compensation and Monthly
Compensation shall be determined without regard to the limitation set forth in
Section 401(a)(17) of the Code and shall be increased by any cash payments made
to the participant pursuant to bonus or incentive plans maintained by the
Company or an Affiliate which is a participating employer under the Retirement
Plan for employees generally and by any amounts deferred by the participant
under any of the Company's or such an Affiliate's deferred compensation plans
for employees, provided that bonus or incentive payments made in a form other
than cash, bonus or incentive payments which are not "year-end" bonus or
incentive payments, bonus or incentive payments under individual agreements
between the Company or such an Affiliate and a participant, and cash payments
made under bonus or incentive plans maintained by the Company or such an
Affiliate for employees generally which exceed the maximum amount that the
Company's President or Chief Operating Officer determines, in his or her
discretion, may be taken into account under this Plan shall not be taken into
account as Compensation and Monthly Compensation for purposes of this Plan
unless the Company's President or Chief Operating Officer determines, in his or
her discretion, that such bonus or incentive payment shall be taken into account
as Compensation and Monthly Compensation under this Plan. Eligible bonuses and
incentive payments shall be taken into account as Compensation and Monthly
Compensation in the year in which such amounts are paid rather than in the year
in which they are earned, provided that the Company's President or Chief
Operating Officer shall have the

                                       6
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authority to determine, in his or her discretion, that such bonus or incentive
payment shall be taken into account in the year in which such amounts are earned
rather than in the year in which they are paid. The Company's President or Chief
Operating Officer shall have the sole and absolute discretion to determine
whether a bonus or incentive payment made to a participant constitutes
Compensation or Monthly Compensation for purposes of this Section 4(a) and may
differentiate among individuals in establishing the bonus or incentive payments
that may be taken into account under the Plan.

            Notwithstanding anything herein to the contrary, the monthly benefit
under this Section 4(a) of a participant who was eligible under Section 3(a) on
December 31, 1999 shall not be less than such monthly benefit on such date, and
the monthly benefit under this Section 4(a) of a participant who was eligible
under Section 3(a) of the APS Plan on December 31, 1999 shall not be less than
the monthly benefit of such participant under Section 4(a) of the APS Plan on
such date, except to the extent attributable solely to an increase in any such
participant's monthly benefit under the Retirement Plan due to an increase in
the limitations under Sections 401(a)(17) and 415 of the Code.

      (b) Section 3(b) Participants.

            Subject to ARTICLE SIX and ARTICLE SEVEN, any participant who is
designated for participation pursuant to Section 3(b) and who receives a benefit
under the Retirement Plan, or such participant's surviving spouse or beneficiary
in the event of the participant's death, shall be entitled to a monthly benefit
payable in accordance with this ARTICLE FOUR and with ARTICLE FIVE equal to (i)
reduced by (ii), where

            (i) Equals the amount of such participant's or surviving spouse's or
      beneficiary's monthly benefit under the Retirement Plan computed under the
      provisions of the Retirement Plan but without regard to the cap on
      Compensation in Section 2.1(n) and

                                       7
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      the limitations in Section 5.13 of the Retirement Plan and the provisions
      of Sections 401(a)(17) and 415 of the Code; and

            (ii) Equals the amount of such participant's or surviving spouse's
      or beneficiary's monthly benefit actually payable under the terms of the
      Retirement Plan.

            For purposes of this Section 4(b), Compensation shall include any
amount of the participant's regular salary that the participant elects to defer
under any deferred compensation plans for employees of the Company or an
Affiliate which is a participating employer under the Retirement Plan and shall
exclude all bonus or incentive payments paid to the participant. The Human
Resources Committee shall have the sole and absolute discretion to determine a
participant's Compensation for purposes of this Section 4(b).

            Benefits payable under this Section 4(b) shall be payable to a Plan
participant or his or her spouse or other beneficiary 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
beneficiary 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.

            Notwithstanding anything herein to the contrary, the monthly benefit
under this Section 4(b) of a participant who was eligible under Section 3(b) on
December 31, 1999 shall not be less than such monthly benefit on such date, and
the monthly benefit under this Section 4(b) of a participant who was eligible
under Section 3(b) of the APS Plan on December 31, 1999 shall not be less than
the monthly benefit of such participant under Section 4(b) of the APS Plan on
such date, except to the extent attributable solely to an increase in any such
participant's monthly benefit under the Retirement Plan due to an increase in
the limitations under Sections 401(a)(17) and 415 of the Code.

                                       8
<PAGE>
                                  ARTICLE FIVE

                               PAYMENT OF BENEFITS

            (a) A participant entitled to benefits under Section 4(a) which are
described in Section 4(a)(1) or 4(a)(2)(i) may elect to commence receiving such
benefits unreduced on or after the date on which the participant attains the age
of sixty-five (65) years or attains the age of sixty (60) years and is credited
with at least twenty (20) Years of Service. A participant may elect to commence
receiving benefits earlier if he or she has attained at least the age of
fifty-five (55) years and is credited with at least ten (10) Years of Service,
provided that the participant's benefit which represents the portion of his or
her benefit calculated in accordance with Section 4(a)(1) or 4(a)(2)(i) shall be
reduced by three percent (3%) for each year (or part thereof) by which the
participant's retirement age precedes the date on which he or she would have
attained the age of sixty (60) years if he or she is credited with at least
twenty (20) Years of Service or the date on which he or she would have attained
the age of sixty-five (65) years if credited with less than twenty (20) Years of
Service.

            Benefits payable to a participant under Section 4(a)(1) or Section
4(a)(2)(i) shall be payable in accordance with Section 6.2 of the Retirement
Plan, and if married, shall provide a monthly payment to the participant for
his or her life equal to the amount determined under Section 4(a)(1) or Section
4(a)(2)(i) and upon his or her death, shall provide monthly payments to the
participant's spouse for life equal to fifty percent (50%) of the monthly
payment being received by the participant at the time of his or her death.

            If a participant entitled to benefits under Section 4(a)(1) or
Section 4(a)(2)(i) dies while still employed by the Company or an Affiliate,
the participant's spouse shall be entitled to a survivor annuity equal to one
hundred percent (100%) of the monthly benefit that the participant would have
received under Section 4(a)(1) or Section 4(a)(2)(i) had he or she terminated
employment on the day before he or she died,

                                       9
<PAGE>
survived to the age on which he or she would first be eligible to commence
benefits under this Section 5(a), elected to retire and commence benefits under
the Plan at that time and then died. Benefits payable to the surviving spouse
shall commence on the first day of the month following the participant's date of
death. The surviving spouse's monthly benefit shall be reduced by the monthly
benefit that the spouse receives under Section 5.9 or Section 5.10 of the
Retirement Plan, whichever is applicable. Benefits payable to a terminated
participant entitled to benefits under Section 4(a)(1) or 4(a)(2)(i) who dies
prior to commencing benefits shall be paid in the form of a survivor annuity
equal to fifty percent (50%) of the monthly benefit which the participant would
have received had he or she survived to the earliest date under this Section
5(a) upon which he or she could have commenced benefits. Such benefits shall
commence on the earliest date under this Section 5(a) upon which the participant
could have commenced benefits had he or she survived. The surviving spouse's
monthly benefit shall be reduced by the monthly benefit that the spouse receives
under Section 5.9 or Section 5.10 of the Retirement Plan, whichever is
applicable.

            (b) Benefits payable to a participant under Section 4(a)(2)(ii) or
Section 4(a)(3) shall become payable when a participant (or his or her spouse or
beneficiary) begins to receive payment of his or her Retirement Account Balance
under the Retirement Plan, and shall be subject to the same adjustments and
shall be payable by the Company in the same manner and at the same time as the
Plan participant's (or his or her spouse's or beneficiary's) Retirement Account
Balance under the Retirement Plan is paid, as though such benefits were
otherwise payable as a part of the benefits being paid under the Retirement
Plan. An election or mode of payment under the Retirement Plan with respect to
the participant's Retirement Account Balance shall constitute an election of a
similar mode of payment under this Plan.

            (c) Benefits payable to a participant under Section 4(b) shall
become payable when a participant (or his or her spouse or beneficiary) begins
to receive payments under the Retirement Plan, and shall be subject to the same
adjustments and shall be payable by the Company in the same manner and at the
same time as the Plan participant's (or his or her spouse's or beneficiary'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, subject to ARTICLE SIX. Except as provided as in this Subsection(c) or
Subsection(d) of this ARTICLE FIVE, an election or mode of payment under the
Retirement Plan shall constitute an election of a similar mode of payment under
this Plan. The form of payment under Section 6.6 of the Retirement Plan shall
not be available under this Plan.

            (d) If the present value of a Participant's vested benefits under
the Plan is Five Thousand Dollars ($5,000.00), or less, at any time after the
Participant's retirement or termination of employment and before his or her
Annuity Starting Date, the Participant's vested benefits shall be distributed in
a single lump sum. The benefits of a non-vested Participant shall automatically
be deemed to be cashed out pursuant to this ARTICLE FIVE (d) upon such
Participant's termination of employment. If the present value of a Participant's
vested benefits is more than Five Thousand Dollars ($5,000.00) but not more than
Ten Thousand Dollars ($10,000.00) at any time after the Participant's retirement
or termination of employment and before his or her Annuity Starting Date, the
Participant's vested benefits shall be distributed in a single lump sum if such
distribution is requested in writing by the Participant and his spouse, if
married, in accordance with the consent and waiver provisions of Section 6.2 of
the Retirement Plan.

            If the present value of the Spouse's Benefit or Vested Survivor's
Benefit under the Plan, as applicable, is Five Thousand Dollars ($5,000.00), or
less, at any time after the Participant's death and before the commencement of
such benefit, the benefit shall be distributed in a single lump sum. If the
present value of the Spouse's Benefit or Vested Survivor's Benefit is more than
Five Thousand Dollars ($5,000.00) but not more than Ten Thousand
Dollars ($10,000.00) at any time after the Participant's death and before the
commencement of such benefit, the benefit shall be distributed in a single lump
sum if such distribution is requested in writing by the Participant's surviving
Spouse.

            For purposes of calculating the present value of a Participant's
vested benefits, the Spouse's Benefit or the Vested Survivor's Benefit, the
actuarial assumptions incorporated by reference in Section 2.1(c) of the
Retirement Plan shall be used, but in no event shall such present value be less
than the present value calculated using the "applicable interest rate" and
"applicable mortality table," as defined in Section 5.19 of the Retirement Plan.

                                   ARTICLE SIX

                            COORDINATION OF BENEFITS

            If an employee who was participating in a retirement plan sponsored
by an Affiliate, which is not a participating employer in the Retirement Plan,
becomes an employee of the Company or a participating Affiliate and a
participant in the Plan under Section 4(b) and such employee's

                                       10
<PAGE>
accrued benefit under the retirement plan maintained by the Affiliate formerly
employing him or her is transferred to the Retirement Plan, upon termination of
employment, the employee's benefits, calculated in accordance with Section 4(b),
will be payable in full from the Plan in accordance with Section 5(b). If an
employee who was a participant in the retirement plan of an Affiliate, which is
not a participating employer in the Retirement Plan, becomes an employee of the
Company or a participating Affiliate and a participant in this Plan, and such
employee's accrued benefit under the retirement plan maintained by his or her
former employer is not transferred to the Retirement Plan, upon termination of
employment, the employee's benefits, calculated in accordance with Section 4(b),
will be payable from the Plan in accordance with Section 5(b) to the extent such
benefits are attributable to the pension benefits payable to that employee under
the Retirement Plan. The benefits calculated pursuant to Section 4(b) that are
attributable to the pension benefits payable to the employee under the
Retirement Plan are those benefits that bear the same ratio to the total
benefits due to the employee, calculated pursuant to Section 4(b), as the
benefit payable to the employee from the Retirement Plan bears to the total
benefits payable to the employee under both the Retirement Plan and the
retirement plan maintained by the Affiliate formerly employing that employee.

                                  ARTICLE SEVEN

                                     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.

                                       11
<PAGE>
                                  ARTICLE EIGHT

                                 ADMINISTRATION

            The Plan will be administered by the Administrative Committee that
administers the Retirement Plan. Except as otherwise expressly provided in this
Plan, the Administrative Committee shall have the same powers and
responsibilities as it has under Sections 10.4 and 12.2 of the Retirement Plan.
Claims for benefits under the Plan shall be determined in the manner set forth
in Article Eleven of the Retirement Plan.

                                  ARTICLE NINE

                      AMENDMENT AND TERMINATION OF THE PLAN

            The 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 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.
All amendments shall be in writing, approved by the Company's Board of Directors
and executed by a duly authorized officer of the Company.

                                   ARTICLE TEN

                                   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 be 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. Notwithstanding the foregoing, assignments of the
benefits provided under this Plan shall be permitted for purposes of

                                       12
<PAGE>
satisfying family support obligations if such assignments are pursuant to a
court order which satisfies the requirements for a "qualified domestic relations
order" as defined in Section 206(d)(3) of the Act.

                                 ARTICLE ELEVEN

                                   WITHHOLDING

            Any taxes required to be withheld from payments to the Plan
participants hereunder shall be deducted and withheld by the Company.

                                 ARTICLE TWELVE

                       OTHER BENEFIT PLANS OF THE COMPANY

            Nothing contained in this Plan shall prevent a Plan participant
prior to his or her death, or his or her spouse or other beneficiary after his
or her death, from receiving, in addition to any payments provided for under
this Plan, any payments provided for under the Retirement Plan or under The
Pinnacle West Capital Corporation Savings Plan, or which would otherwise be
payable or distributable to him or her, his or her surviving spouse or
beneficiary 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 THIRTEEN

                                  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.

                                       13
<PAGE>
            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.

                                ARTICLE FOURTEEN

                                 EFFECTIVE DATE

            The Plan, as amended and restated, shall be effective as of January
1, 2003.

            IN WITNESS WHEREOF, the Company has caused this Pinnacle West
Capital Corporation Supplemental Excess Benefit Retirement Plan, as amended and
restated herein, to be executed by its duly authorized officer this 18th day of
December ___, 2003.

                                               PINNACLE WEST CAPITAL CORPORATION

                                               By /s/ Jack Davis
                                                 -------------------------------
                                                     Its COO PNW/CEO & Pres. APS
                                                        ------------------------

Attest:
By /s/ Nancy C. Loftin
  -----------------------------
      Its VP, General Counsel and Secretary
         ----------------------------------

                                       14<PAGE>
                                                                  Exhibit 10.64b

                              FOURTH AMENDMENT TO
                     THE PINNACLE WEST CAPITAL CORPORATION
                         ARIZONA PUBLIC SERVICE COMPANY
                           SUNCOR DEVELOPMENT COMPANY
                        AND EL DORADO INVESTMENT COMPANY
                           DEFERRED COMPENSATION PLAN

     Effective January 1, 1992, Pinnacle West Capital Corporation (the
"Company"), Arizona Public Service Company, SunCor Development Company and El
Dorado Investment Company adopted the Pinnacle West Capital Corporation,
Arizona Public Service Company, SunCor Development Company and El Dorado
Investment Company Deferred Compensation Plan (the "Plan"). The Plan was
thereafter amended several times. The Plan was amended and restated in its
entirety on December 1, 1995 and amended several times thereafter. The Plan was
most recently amended on October 22, 2002 to increase the threshold for
automatic cashout for terminated or retired Participants under certain
circumstances and revise crediting of interest for certain Participants.

     By this instrument, the Plan is being amended to revise its claims
procedures.

     1.   This Amendment shall amend only those Sections set forth herein and
those Sections not amended hereby shall remain in full force and effect.

     2.   Section 1.17 is hereby amended in its entirety to read as follows:

          1.17  "Disability" shall mean (i) in the case of a Participant who is
   an employee of an Employer, a period of disability during which a participant
   qualifies for benefits under the Participant's Employer's long-term
   disability plan, or (ii) in the case of a Participant who is a Director, a
   period of disability during
<PAGE>
     which the Participant would have qualified for benefits under such a plan,
     as determined in the sole discretion of the Committee, had the Participant
     been an employee of an Employer.

     3.   Section 8.1(b) is hereby amended in its entirety to read as follows:

          (b)  Waiver of Deferral; Credit for Plan Year of Disability. A
               Participant who is determined to be suffering from a Disability
               shall be excused from fulfilling that portion of the Annual
               Deferral commitment that would otherwise have been withheld from
               a Participant's Base Annual Salary, Year-End Bonus and/or
               Directors Fees for the Plan Year during which the Participant
               first suffers a Disability. In addition, the Participant's
               Account Balance shall be credited with that portion of the Annual
               Deferral commitment that is excused in accordance with the
               preceding sentence, unless the Disability ceases in the Plan Year
               that it commences, in which case, the crediting shall apply only
               for the period of Disability.

     4.   Section 8.2 is hereby amended in its entirety to read as follows:

     8.2  Disability Benefit. A Participant suffering a Disability shall, for
          benefit purposes under this Plan, continue to be considered to be
          employed and shall be eligible for the benefits provided for in
          Articles 4, 5, 6 or 7 in accordance with the provisions of those
          Articles. Notwithstanding the above, the Committee shall have the
          right, in its sole and absolute discretion and for purposes of this
          Plan only, to terminate a Participant's employment or service as a
          Director at any time after such Participant is determined to be
          suffering from a Disability. In determining the Participant's Account
          Balance for purposes of the Disability Benefit described in the
          previous sentence, the Preferred Rate shall be used in lieu of the
          rates specified in Section 7.1.

     5.   ARTICLE 14 is hereby amended in its entirety to read as follows:

                                   ARTICLE 14

                               Claims Procedures

          14.1 Claims. Any Participant, Beneficiary or any authorized
     representative acting on behalf of the Participant or Beneficiary
     ("Claimant")

                                       2
<PAGE>
claiming benefits, eligibility, participation or any other right or interest
under this Plan may file a written claim setting forth the basis of the claim
with the Employee Benefits Department. A written notice of the Employee Benefits
Department's disposition of any such claim shall be furnished to the Claimant
within a reasonable time (not to exceed ninety (90) days) after the claim is
received by the Employee Benefits Department. Notwithstanding the foregoing, the
Employee Benefits Department may have additional time (not to exceed ninety (90)
days) to decide the claim if special circumstances exist, provided that it
advises the Claimant, in writing and prior to the end of the initial ninety (90)
day period, of the special circumstances giving rise to the need for additional
time and the date on which it expects to decide the claim. If the claim is
denied, in whole or in part, the notice of disposition shall include the
specific reason for the denial, identify the specific provisions of the Plan
upon which the denial is based, describe any additional material or information
necessary to perfect the claim, explain why that material or information is
necessary and describe the Plan's review procedures, including the timeframes
thereunder for a Claimant to file a request for review and for the Committee to
decide the claim. The notice shall also include a statement advising the
claimant of his or her right to bring a civil action under Section 502(a) of the
Employee Retirement Income Security Act of 1974, as amended, if his or her claim
is denied, in whole or in part, upon review.

     Within sixty (60) days after receiving the written notice of the Employee
Benefits Department's disposition of the claim, the Claimant may request, in
writing, review by the Committee of the Employee Benefits Department's decision
regarding his or her claim. Upon written request, the Claimant shall be
entitled to a review meeting with the Committee to present reasons why the
claim should be allowed. The Claimant may submit a written statement in support
of his or her claim, together with such comments, information and material
relating to the claim, as he or she deems necessary or appropriate. The
Claimant shall be provided, upon request and free of charge, reasonable access
to, and copies of, all documents, records and other information which are
relevant to the Claimant's claim and its review. If the Claimant does not
request review within sixty (60) days after receiving written notice of the
Employee Benefits Department's disposition of the claim, the Claimant shall be
deemed to have accepted the Employee Benefits Department's written disposition.

     The Committee shall make its decision on review and provide written notice
thereof to the Claimant within a reasonable time (not to exceed sixty (60)
days) after the claim is received by the Committee. Notwithstanding the
foregoing, the Committee may have additional time (not to exceed sixty (60)
days) to decide the claim if special circumstances exist provided that it
advises the Claimant, in writing, prior to the end of the initial sixty (60)
day period, of the special circumstances giving rise to the need for additional
time and the date on which it expects to decide the claim. In no event shall
the Committee have more than one hundred twenty (120) days following its
receipt of the Claimant's request for review to provide the Claimant with
written notice of its decision.

                                       3
<PAGE>
     The Committee shall have the right to request of and receive from Claimant
such additional information, documents or other evidence as the Committee may
reasonably require. In the event that the Committee requests such additional
information from the Claimant, the period for making the benefit determination
on review shall not take into account the period beginning on the date on which
the Committee notifies the Claimant in writing of the need for additional
information and ending on the date on which the Claimant responds to the request
for additional information.

     If the claim is denied upon review, in whole or in part, the notice of
disposition shall include the specific reason for the denial, identify the
specific provision of the Plan upon which the denial is based, include a
statement advising the Claimant of his or her right to receive, upon written
request and free of charge, reasonable access to and copies of all documents,
records and other information which are relevant to the Claimant's claim. The
notice shall also include a statement advising the claimant of his or her right
to bring a civil action under Section 502(a) of the Employee Retirement Income
Security Act of 1974, as amended, if his or her claim is denied, in whole or in
part, upon review.

     For purposes of this Section 14.1, a document, record or information will
be considered "relevant" if it (a) was relied upon by the Employee Benefits
Department or Committee, as applicable, in making the benefit decision, (b) was
submitted, considered or generated in the course of making such decisions, even
if it was not relied upon in making those decisions, or (c) demonstrates
compliance with the administrative processes and safeguards established by the
Plan to insure that the terms of the Plan have been followed and applied
consistently.

     To the extent permitted by law, a decision on review by the Committee shall
be binding and conclusive upon all persons whomsoever. Completion of the claims
procedure described in this Section 14.1 shall be a mandatory precondition that
must be complied with prior to commencement of a legal or equitable action in
connection with the Plan by a person claiming rights under the Plan, or by
another person claiming rights through such a person. The Committee may, in its
sole discretion, waive these procedures as a mandatory precondition to such an
action.

                                       4

<PAGE>

     6.   Except as otherwise expressly provided herein, this Amendment shall
be effective January 1, 2003.

     Except as amended hereby, the Company ratifies and confirms the Plan as
amended and restated effective January 1, 1995, and as thereafter amended.

                              Date: December 18, 2003

                              PINNACLE WEST CAPITAL CORPORATION

                              By /s/ Jack Davis
                                -------------------------------
                                Its COO PNW/CEO APS & Pres
                                    ---------------------------

                                       5

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