EXHIBIT 10.6a

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



     Pinnacle West  Capital Corporation ("Pinnacle"), 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 December  4, 1992, by making the following
deletions and additions:


I.   Definition of "Unforeseeable Financial Emergency"

     The definition of "Unforeseeable  Financial Emergency" found at Section
     1.34 is deleted and a new Section 1.34 is added that reads as follows:

     "`Unforeseeable   Financial  Emergency'  shall  mean  an  unanticipated
     emergency  that  is  cause  by  an  event  beyond  the  control of  the
     Participant that  would  result in  severe  financial hardship  to  the
     Participant  resulting  from (i)  a  sudden and  unexpected  illness or
     accident of the  Participant or a dependent of the  Participant, (ii) a
     loss of the Participant's property due to  casualty or (iii) such other
     extraordinary and  unforeseeable circumstances  arising as a  result of
     events beyond the control of the Participant, all as determined in  the
     sole discretion of the Committee."

II.  Modification of Section 4.1

     Section  4.1  is modified  to  add the  following  sentence at  the end
     thereof:

     "Notwithstanding  the  foregoing,  amounts  transferred  to  this  plan
     pursuant  to  Section 13.2  shall  not  be  eligible  for a  Short-Term
     Payout."

III. Modification of Section 4.2

     Section 4.2 is modified by deleting the second sentence of that Section
     and adding the following second sentence:

     "The  payout shall  not  exceed the  lesser  of (i)  the  Participant's
     Account Balance,  calculated as if  such Participant  were receiving  a
     Termination  Benefit, or (ii)  the amount reasonably  needed to satisfy
     the Unforeseeable Financial Emergency."

IV.  Addition of New Section 13.2

     A new Section 13.2 is added that reads as follows:

     "Any  Participant who was a  participant in the  Arizona Public Service
     Company  Deferred   Compensation  Plan,   the  Pinnacle   West  Capital
     Corporation  Deferred Compensation  Plan,  the Arizona  Public  Service
     Company  Directors' Deferred  Compensation  Plan or  the Pinnacle  West
     Capital  Corporation  Directors' Deferred  Compensation  Plan prior  to
     becoming a Participant in this Plan shall have the right to elect, upon
     the later of the date upon which he or she first becomes designated for
     participation in the Plan  or the first  Plan Entry Date following  the
     adoption of  this amendment, to transfer  his or her  Deferral Option I
     account balance in that plan to this Plan.  This election shall be made
     in accordance with the rules and  on the forms established from time to
     time  by the Committee.   If  the election  is made,  the Participant's
     Deferral Option  I account balance under the  other plan shall be added
     to his or her Account Balance  under this Plan and any such transferred
     account balance shall  become subject  to the terms  and conditions  of
     this Plan.  Upon the  completion of the transfer of his or  her account
     balance  under  the   other  plan  to  this   Plan,  the  Participant's
     participation  in Deferral Option I  of the other  plan shall terminate
     and he  or she shall have  no further interest in  Deferral Option I of
     that plan.

          Pinnacle  has caused  this  Amendment to  be  signed by  its  duly
authorized officer on December 31, 1992.


                                      Pinnacle West Capital Corporation



                                      By      Faye Widenmann
                                        ------------------------------------
                                         Its     Vice President
                                            --------------------------------