Exhibit 99.1


            PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED

                                $

                         Arizona Public Service Company
                               % Senior Notes Due

Interest payable                 and                              Due

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

  The Offered Notes will mature on _____________. Interest on the Offered Notes
  is payable semiannually on ______________ and __________________of each year,
    commencing _________________ . The Offered Notes are redeemable prior to
     Maturity at a redemption price equal to the sum of (i) the principal of
      the Offered Notes being redeemed plus accrued interest thereon to the
        redemption date plus (ii) the Make-Whole Amount. For other terms
         of the Offered Notes, see "Certain Terms of the Offered Notes"
          herein and "Description of Senior Notes" in the accompanying
            Prospectus. The Notes will be represented by one or more
             Global Securities (as defined herein) registered in the
               name of a nominee of The Depository Trust Company.

Until the Release Date (as defined in the accompanying Prospectus), the Offered
     Notes will be secured by the Company's first mortgage bonds issued and
     delivered to the Senior Note Trustee. See "Description of Senior Notes
      -- Release Date" and "Description of Senior Notes -- Security" in the
      accompanying Prospectus. On the Release Date, the Offered Notes will
          cease to be secured by such first mortgage bonds, will become
           unsecured general obligations of the Company and will rank
          on a parity with other unsecured indebtedness of the Company
            (unless otherwise secured as described in the Prospectus
         under the caption "Description of Senior Notes -- Limitations
                on Liens and Sale and Lease-Back Transactions").

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

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
               PROSPECTUS SUPPLEMENT OR THE PROSPECTUS. ANY REPRE-
                SENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.


                                              Underwriting
                                 Price To     Discounts And     Proceeds To
                                Public(1)      Commissions     Company(1)(2)
                                ---------      -----------     -------------
Per Offered Note .............           %               %                 %
Total ........................   $              $               $


(1) Plus accrued interest, if any, from             .
(2) Before deduction of expenses payable by the Company estimated at $         .

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

   The Offered  Notes are offered by the several  Underwriters  when,  as and if
issued by the Company, delivered to and accepted by the Underwriters and subject
to their right to reject  orders in whole or in part.  It is  expected  that the
delivery  of the  Offered  Notes in  book-entry  form will be made  through  the
facilities  of The  Depository  Trust Company on or about             ,  against
payment therefor in immediately available funds.


            The date of this Prospectus Supplement is _____________.

   IN CONNECTION WITH THIS OFFERING,  THE  UNDERWRITERS  MAY OVERALLOT OR EFFECT
TRANSACTIONS  WHICH  STABILIZE OR MAINTAIN THE MARKET PRICE OF THE OFFERED NOTES
AT A LEVEL ABOVE THAT WHICH MIGHT  OTHERWISE  PREVAIL IN THE OPEN  MARKET.  SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

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

                             APPLICATION OF PROCEEDS

   The Company  intends to apply the net  proceeds  from the sale of the Offered
Notes to              . Any proceeds not immediately so applied will be invested
temporarily,  pending such  application,  in United States  government or agency
obligations,  commercial  paper,  bank  certificates  of deposit,  or repurchase
agreements collateralized by United States government or agency obligations,  or
will be deposited with banks.

                       CERTAIN TERMS OF THE OFFERED NOTES


   The  following  description  of the  particular  terms of the  Offered  Notes
offered hereby  supplements  the description of the general terms and conditions
of Senior Notes set forth under the heading "Description of Senior Notes" in the
Prospectus,  to which  description  reference  is  hereby  made.  The  terms and
conditions set forth herein will apply to each Offered Note.  Capitalized  terms
not  defined  under  this  heading  have the  meanings  assigned  to them in the
Prospectus or the Indenture (the "Senior Note Indenture"),  dated as of November
15, 1996,  between the Company and The Bank of New York, as Trustee (the "Senior
Note Trustee").

General

   The  Offered  Notes  offered  hereby  will be issued  under the  Senior  Note
Indenture  as  supplemented  by the First  Supplemental  Indenture,  dated as of
November 15, 1996, the Second Supplemental  Indenture dated as of April 1, 1997,
and the Third Supplemental Indenture, dated as of           , (collectively, the
"Supplemental Indentures"), between the Company and the Senior Note Trustee. The
Offered  Notes  constitute  a single  series for  purposes  of the  Senior  Note
Indenture, limited to an aggregate principal amount not to exceed $           .

   The Offered Notes will initially be represented by a Global Note that will be
deposited   with,   or  on  behalf  of,  The   Depository   Trust  Company  (the
"Depositary").  See  "Description  of  Senior  Notes  --  Global  Notes"  in the
accompanying Prospectus.  The Offered Notes will be issuable in denominations of
$1,000 and any integral multiple thereof.

   The Offered Notes will mature on               (the "Maturity").

   The Offered Notes will bear interest  from and including                   or
from and including the most recent  Interest  Payment Date with respect to which
interest on such Offered Note (or any predecessor Offered Note) has been paid or
duly  provided  for to, but  excluding,  the relevant  Interest  Payment Date at
           % per annum until the principal thereof is paid or made available for
payment.  The Interest Payment Dates will  be            and             of each
year,  commencing                   .  Interest  will be  payable  to the person
(which,  in the case of the Global Note,  shall be the Depositary) in whose name
an Offered  Security is registered at the close of business on                  
or                  (each, a "Regular Record Date") next preceding such Interest
Payment Date; provided,  however,  that the interest payable at Maturity will be
payable to the person to whom principal shall be payable. The amount of interest
payable for any period will be computed on the basis of a 360-day year of twelve
30-day months.

Redemption

   The Offered  Notes may be redeemed at any time at the option of the  Company,
in whole or from time to time in part, at a redemption price equal to the sum of
(i) the principal amount of the Offered
                                       S-2

Notes (or portion  thereof) being redeemed plus accrued  interest thereon to the
redemption date and (ii) the Make-Whole  Amount (as defined below), if any, with
respect  to  the  Offered  Notes  (or  portion   thereof)  being  redeemed  (the
"Redemption Price").

   If notice has been given as provided in the Senior Note  Indenture  and funds
for the  redemption  of any Offered  Notes (or any portion  thereof)  called for
redemption  shall have been made available on the redemption date referred to in
such notice,  such  Offered  Notes (or any portion  thereof)  will cease to bear
interest on the date fixed for such redemption  specified in such notice and the
only right of the Holders of such  Offered  Notes will be to receive  payment of
the Redemption Price.

   Notice of any  optional  redemption  of any  Offered  Notes  (or any  portion
thereof) will be given to Holders at their  addresses,  as shown in the security
register for such Offered Notes, not more than 60 nor less than 30 days prior to
the date fixed for  redemption.  The notice of redemption  will  specify,  among
other items,  the Redemption Price and the principal amount of the Offered Notes
held by such Holder to be redeemed. If less than all of the Offered Notes are to
be redeemed at the option of the  Company,  the Trustee  shall  select,  in such
manner as it shall deem fair and appropriate,  such Offered Notes to be redeemed
in whole or in part.

   As used herein:

      "Make-Whole  Amount" means, in connection with any optional  redemption of
   any Offered Notes, the excess,  if any, of (i) the aggregate present value as
   of the date of such redemption of each dollar of principal being redeemed and
   the  amount  of  interest  (exclusive  of  interest  accrued  to the  date of
   redemption)  that would have been  payable in respect of each such  dollar if
   such  redemption  had  not  been  made,  determined  by  discounting,   on  a
   semi-annual  basis,  such  principal  and interest at the  Reinvestment  Rate
   (determined  on the third  Business  Day  preceding  the date such  notice of
   redemption is given) from the  respective  dates on which such  principal and
   interest would have been payable if such  redemption had not been made,  over
   (ii) the aggregate principal amount of the Offered Notes being redeemed.

      "Reinvestment  Rate"  means           %  plus the  arithmetic  mean of the
   yields  under the  respective  heading  "Week  Ending"  published in the most
   recent Statistical  Release under the caption "Treasury Constant  Maturities"
   for  the  maturity  (rounded  to  the  nearest  month)  corresponding  to the
   remaining  life to maturity,  as of the payment date of the  principal  being
   redeemed. If no maturity exactly corresponds to such maturity, yields for the
   two published maturities most closely corresponding to such maturity shall be
   calculated   pursuant  to  the   immediately   preceding   sentence  and  the
   Reinvestment Rate shall be interpolated or extrapolated from such yields on a
   straight-line basis, rounding in each of such relevant periods to the nearest
   month. For the purpose of calculating the Reinvestment  Rate, the most recent
   Statistical Release published prior to the date of determination of the Make-
   Whole Amount shall be used.

      "Statistical  Release" means the statistical release designed  "H.15(519)"
   or any successor publication which is published weekly by the Federal Reserve
   System  and  which  establishes  yields  on  actively  traded  United  States
   government   securities  adjusted  to  constant   maturities,   or,  if  such
   statistical  release is not published at the time of any determination  under
   the Indenture,  then such other  reasonably  comparable  index which shall be
   designated by the Company.

      The Offered Notes will not be subject to any sinking fund.

Security

   Upon the issuance of the Offered Notes, the Company will simultaneously issue
and deliver to the Senior Note Trustee, as security for the Offered Notes, First
Mortgage  Bonds,  Senior Note Series         (the "Series         First Mortgage
Bonds").  The Series            First Mortgage Bonds will have the same interest
rate, Interest Payment Dates, Maturity and redemption provisions, and will be in
the same aggregate principal amount as the Offered Notes.

   Subject to the provisions of the Senior Note Indenture governing disbursement
of funds  following  an event of  default,  payment by the Company to the Senior
Note Trustee of the principal and interest on the
                                       S-3

   Series            First  Mortgage  Bonds will be  applied by the Senior  Note
Trustee to satisfy the Company's  obligations  with respect to the principal and
interest on the Offered Notes. As provided in the supplemental indenture setting
forth the terms of the Series            First  Mortgage  Bonds,  the  Company's
obligation  to make  payments  with respect to the  principal,  premium,  and/or
interest on the Series         First Mortgage Bonds shall be fully or partially,
as the case may be,  satisfied  and  discharged  to the extent that, at the time
that any such  payment  shall be due,  the  corresponding  amount of  principal,
premium,  if any, and/or interest then due, on the Offered Notes shall have been
fully or partially  paid, as the case may be, or there shall have been deposited
with the Senior Note Trustee  pursuant to the Senior Note Indenture  trust funds
sufficient  under  the  provisions  of the  Senior  Note  Indenture  to fully or
partially pay the  corresponding  amount of principal,  premium,  if any, and/or
interest then due on the Offered Notes.

   Reference is made to  "Description  Of Senior  Notes -- Release  Date" in the
accompanying  Prospectus for a description of the circumstances  under which all
or part of the Senior  Note  Mortgage  Bonds will cease to be held by the Senior
Note Trustee as security for the Senior Notes.  As explained in the  Prospectus,
the Senior Notes will cease to be secured by the Senior Note  Mortgage  Bonds on
the Release Date and will become unsecured  general  obligations of the Company.
The Release Date will be the date that all First  Mortgage  Bonds of the Company
issued and  outstanding  under the  Mortgage,  other than Senior  Note  Mortgage
Bonds,  have been retired (at,  before or after the  maturity  thereof)  through
payment,  redemption or otherwise.  The following is a schedule of maturities of
First  Mortgage  Bonds (not  including  Senior Note  Mortgage  Bonds)  which are
outstanding as of the date hereof.  This schedule does not reflect the timing of
redemptions which may occur prior to maturity.

                        7.625% Series due March 15, 1998
                        7.625% Series due June 15, 1999
                        5.75% Series due Sept. 15, 2000
                        8.125% Series due March 15, 2002
                        6.625% Series due March 1, 2004
                        10-1/4 % Series due May 15, 2020
                        9.5% Series due April 15, 2021
                        9% Series due Dec. 15, 2021
                        7.25% Series due Aug. 1, 2023
                        8.75% Series due Jan. 15, 2024
                        8% Series due Feb. 1, 2025
                        5.5% Series due Aug. 15, 2028
                        5.875% Series due Aug. 15, 2028

Defeasance

   The provisions  described in the  accompanying  Prospectus  under the caption
"Description of Senior Notes -- Defeasance and Covenant Defeasance" are
applicable to the Offered Notes.

                                  UNDERWRITING

   The  Underwriters  named below have  severally  agreed to  purchase  from the
Company the following respective principal amounts of Offered Notes:

                                                               Principal
                  Underwriter                                    Amount
                -------------------                         --------------
                                                            $

                                                            --------------
                Total ...................................   $
                                                            ==============

   The Distribution  Agreement provides that the obligations of the Underwriters
are subject to certain conditions  precedent,  and that the Underwriters will be
obligated to purchase all of the Offered Notes if any are purchased.
                                       S-4

   The Company has been advised by the several Underwriters that they propose to
offer the Offered Notes to the public initially at the public offering price set
forth on the cover page of this Prospectus  Supplement and to certain dealers at
such price less a  concession  not in excess of             %  of the  principal
amount of the Offered Notes.  The  Underwriters  may allow, and such dealers may
reallow,  a discount not in excess of              %  of the principal amount of
the Offered Notes to certain other dealers.  After the initial public  offering,
the public offering price, concession and discount may be changed.

   The Offered Notes are a new issue of securities  with no established  trading
market.  The Company has been  advised by the  Underwriters  that they intend to
make a market  in the  Offered  Notes,  but are not  obligated  to do so and may
discontinue  market making at any time without notice. No assurance can be given
as to the liquidity of the trading market for the Offered Notes.

   Certain  of  the  Underwriters  have  provided  various   investment  banking
services,  including  serving as  commercial  paper  dealers under the Company's
commercial  paper program,  to the Company and its affiliates from time to time,
for which they have received customary compensation. In addition, certain of the
Underwriters have provided various  investment banking services to Pinnacle West
Capital  Corporation,  the Company's  parent,  from time to time, for which they
have received customary compensation.

   The  Company  has  agreed  to  indemnify  the  Underwriters  against  certain
liabilities, including liabilities under the Securities Act of 1933, as amended.
                                       S-5

============================================  ==================================

   No dealer,  salesperson  or other  person
has been  authorized to give any information
or to make any  representation not contained
in  this   Prospectus   Supplement   or  the        Arizona Public Service
Prospectus  and,  if  given  or  made,  such               Company        
information  or  representation  must not be                              
relied upon as having been authorized by the                              
Company   or  by   any   Underwriter.   This                              
Prospectus  Supplement and the Prospectus do                              
not   constitute  an  offer  to  sell  or  a                              
solicitation  of an  offer to buy any of the                 APS          
securities    offered    hereby    in    any                              
jurisdiction  to any  person  to  whom it is                              
unlawful   to  make   such   offer  in  such                              
jurisdiction.  Neither the  delivery of this             $                
Prospectus  Supplement or the Prospectus nor          % Senior Notes Due  
any  sale  made   hereunder  and  thereunder                              
shall, under any  circumstances,  create any                              
implication  that the information  herein is                              
correct  as of any  time  subsequent  to the                              
date hereof or that there has been no change                              
in the  affairs  of the  Company  since such        PROSPECTUS SUPPLEMENT 
date.                                                                     
                                                    
              ----------------
                                                  
              TABLE OF CONTENTS

            Prospectus Supplement

                                         Page
                                         ---
Application of Proceeds .................S-2
Certain Terms of the Offered Notes ......S-2
Underwriting ............................S-4

                  Prospectus

Available Information ...................  2
Incorporation of Certain Documents by
 Reference ..............................  2
Selected Information ....................  3
The Company .............................  4
Principal Holders of Voting Securities ..  4
Application of Proceeds .................  4
Earnings Ratios .........................  4
Securities ..............................  5
Description of New Bonds ................  5
Description of Senior Notes .............  9
Description of Debt Securities .......... 19
Plan of Distribution .................... 27
Experts ................................. 27
Legal Opinions .......................... 27

============================================  ==================================