Exhibit 10.4


                                AMENDMENT NO. 4
                                       TO
                       PINNACLE WEST CAPITAL CORPORATION
                         ARIZONA PUBLIC SERVICE COMPANY
                           SUNCOR DEVELOPMENT COMPANY
                                      AND
                          EL DORADO INVESTMENT COMPANY
                           DEFERRED COMPENSATION PLAN


              Pinnacle West Capital  Corporation,  pursuant to the power granted
to it by Section 11.2 of the  above-named  plan (the "Plan"),  hereby amends the
Plan,  effective  as of May 17,  1995,  by making the  following  deletions  and
additions:

1.      Section 1.28 is deleted in its entirety  and the  following  new Section
        1.28 is added:

        "'Retirement'  and  'Retires'  shall mean, with  respect to an employee,
        severance from employment with all Employers for any reason other than a
        leave of  absence,  death or  Disability  on or after the earlier of the
        attainment of: (a) age sixty-five (65) with five (5) years of service or
        (b) age fifty-five (55) with ten (10) years of Service;  and shall mean,
        with respect to a Director  who is not an employee,  severance of his or
        her  directorship(s)  with all  Employers on or after the earlier of the
        attainment of: (x) age sixty-five (65) with five (5) years of service or
        (y) age  fifty-five  (55)  with ten (10)  years of board  service.  If a
        Participant  is both an employee  and a Director,  Retirement  shall not
        occur  until  he or she  Retires  as both an  employee  and a  Director;
        provided, however, that such a Participant may elect, in accordance with
        the policies and procedures established by the Committee,  to Retire for
        purposes  of this Plan at the time he or she  Retires as an  employee of
        all Employers."

2.      Section 3.6(a) deleted in its entirety and a new Section 3.6(a) is added
        to read as follows:

        "3.6   Installment  Distributions.  In the  event a  benefit  is paid in
               --------------------------
               installments  under  Articles 5, 6, 7 or 8,  installment  payment
               amount shall be determined in the following manner:

        (a)    Interest  Rate.  The  interest  rate  to  be  used  to  calculate
               --------------
               installment  payment  amounts shall be a fixed interest rate that
               is determined by averaging the Preferred  Rates for the Plan Year
               in which a Participant  becomes eligible to receive a benefit and
               the four (4) preceding Plan Years. If a Participant has completed
               fewer than five (5) Plan Years,  this average shall be determined
               using the  Crediting  Rates for the Plan Years  during  which the
               Participant  participated in the Plan. Despite the foregoing,  if
               the Terminated  Participant elects  installment  distributions at
               age 55,  the  applicable  interest  rate(s)  to be used  from the
               termination  date until age 55 shall be  determined in accordance
               with the table set forth in Section  7.1, by using the  Crediting
               Rate(s) or Preferred Rates, as the case may be."

3.      Section 7.1 is deleted in its entirety and the following new section 7.1
        is added:

        "7.1   Termination   Benefits.   If  the   Participant   experiences   a
               ----------------------
               Termination of Employment  prior to his or her Retirement,  death
               or  disability,  the  Participant  shall  receive  a  Termination
               Benefit,  which  shall  be  equal  to the  Participant's  Account
               Balance as of the date of his or her  Termination  of Employment,
               with  interest  credited  in the manner  provided  in Section 3.5
               above,  but using the  applicable  interest rate set forth in the
               following schedule:


                Completion of Years of Plan Participation
                Prior to Termination of Employment               Applicable Rate
                -----------------------------------------        ---------------

                Less than five years                              Crediting Rate

                Five or more years                               Preferred Rate"

4.      Section 7.2 is deleted in its entirety and the following new Section 7.2
        is added:

             Payment of Termination Benefit.
             ------------------------------

             (a)  Lump Sum or  Installments.  A Participant,  in connection with
                  -------------------------
                  his or her  commencement of  participation  in the Plan, shall
                  elect on an Election Form to receive the  Termination  Benefit
                  in a  lump  sum  or  in  equal  annual  payments  (the  latter
                  determined in accordance with Section 3.6 above) over a period
                  of 5, 10 or 15  years.  If a  Participant  elects  a lump  sum
                  payment,  he or she shall specify whether the lump sum will be
                  paid  within  60  days  of  (i)  his  or  her  Termination  of
                  Employment  or  (ii)  age  55.  If  the   Participant   elects
                  installment  payments,  they will begin  within 60 days of the
                  Participant's 55th birthday. The Participant may change his or
                  her  election to an  allowable  alternative  pay out period by
                  submitting a new Election Form to the Committee, provided that
                  any such  Election Form is submitted at least 3 years prior to
                  the Participant's Termination of Employment and is accepted by
                  the  Committee  in its sole  discretion.  Notwithstanding  the
                  foregoing,  upon adoption of this Section, each Participant in
                  the Plan  shall be given an  opportunity  to make an  election
                  with  respect  to his or her  Termination  Benefit,  and  such
                  election, if accepted by the Committee,  shall be treated, for
                  purposes  of this  Section,  as the initial  election  for the
                  payment  of  the  Termination  Benefit.  Failure  to  make  an
                  election will result in the Termination Benefit paid in a lump
                  sum at the time of your termination of employment.

             (b)  Commencement  of  Payments.   Payment(s)  of  the  Termination
                  --------------------------
                  Benefit shall  commence  within 60 days of the date elected by
                  the Participant in accordance with Section 7.2(a) above."

5.      The following new Section 7.3 is added:

        "7.3   Death Prior to Pay Out
               ---------------------

               (a)   Death Prior to Commencement  of Payments.  If a Participant
                     ----------------------------------------
                     dies prior to the payout  date that he or she  elected  for
                     his Termination  Benefit,  his or her  Termination  Benefit
                     shall be paid in a lump sum within 60 days of the date that
                     the Committee receives proof of the Participant's death.

               (b)   Death After  Commencement.  If a Participant dies after the
                     -------------------------
                     commencement  of the  payment  of  his  or her  Termination
                     Benefit,  but  before  the  Termination  Benefit is paid in
                     full, the Participant's unpaid Termination Benefit payments
                     shall  continue  and  shall  be paid  to the  Participant's
                     Beneficiary  over the remaining  number of years and in the
                     same  amounts as that  benefit  would have been paid to the
                     Participant had the Participant survived."

6.      Except  as  specifically  provided  in  this  Amendment,  the  remaining
        provisions  of the Plan,  as  previously  amended,  shall remain in full
        force and effect.



                Pinnacle West Capital  Corporation  has caused this Amendment to
be signed by its duly authorized officer as of the date first written above.


                                       Pinnacle West Capital Corporation


                                       By:        Faye Widenmann     
                                            -----------------------------
                                       Its:       Committe Member
                                            -----------------------------