Arizona Public Service Company

                                   ("Company")

                           Medium-Term Notes, Series B

                   Due Nine Months or More from Date of Issue

                                 TERMS AGREEMENT
                                 ---------------


                                                                   April 7, 1997


Arizona Public Service Company
400 North 5th Street
Phoenix, AZ   85004
Attention:  Treasurer

Ladies and Gentlemen:

                  We  offer  to  purchase,  on  and  subject  to the  terms  and
conditions of the  Distribution  Agreement  filed as an exhibit to the Company's
registration statement on Form S-3 (No. 333-15379)  ("Distribution  Agreement"),
the following Securities ("Notes") on the following terms:

                  Title:  6.72% Senior Notes Due 1999

                  Currency or Currency Units:  United States dollars

                  Stated Maturity:  April 1, 1999

                  Principal Amount:  $50,000,000

                  Public Offering Price:  100%

                  Original Issue Discount Security:  Yes       No    X
                                                         ----      -----
                  Denominations:  $1,000 and integral multiples thereof.

                  Purchase Price (to be paid in immediately available funds):  
                  99.750%, plus accrued interest, if any, from April 10, 1997

                  Underwriting Discount or Commission received from the 
                  Company (%):  .250%

                  Proceeds to Company (If different from Public Offering Price)
                  (%):  99.750%

                  Optional  Redemption (option of the Company):  As described in
                  pages S-3 to S-4 of the Prospectus Supplement,  dated December
                  26, 1996 (the "Prospectus Supplement")

                  Optional Redemption (option of the Holder):  None

                  Sinking Fund:  None

                  Other Terms:  None

                  Trade Date:  April 7, 1997

                  Settlement Date (Issue Date):  April 10, 1997

                           *       *        *        *        *

Details for Settlement
- ----------------------

                           Exact  name  in which the  Note or  Notes  are to  be
                           registered ("registered owner"):  Cede & Co.

                           Principal   amount  of   each   Note  in   authorized
                           denominations to be delivered to registered owner: 
                           $50,000,000

                           *       *        *        *        *

                  Our  agreement to purchase  the Notes  hereunder is subject to
the  conditions  set  forth  in  the  Distribution   Agreement,   including  the
conditions,  and the delivery of the documents,  set forth in Section 5 thereof.
If  for  any  reason  the  purchase  by the  undersigned  of  the  Notes  is not
consummated  other than because of a default by the  undersigned or a failure to
satisfy a condition  set forth in clause  (ii),  (iii) or (v) of Section 5(c) of
the Distribution Agreement,  the Company shall reimburse the undersigned for all
out-of-pocket expenses reasonably incurred by the undersigned in connection with
the offering of the Notes and not otherwise  required to be reimbursed  pursuant
to Section 4 of the Distribution Agreement.

                  The Notes will have the terms  described in the  Prospectus as
supplemented  by the  Prospectus  Supplement  dated  December  26,  1996 and the
Pricing Supplement No. 1 dated April 7, 1997 (the "Pricing Supplement").

                  The  principal  amount  of  Notes  to  be  purchased  by  each
Distributor is as specified in the Pricing  Supplement.  The  obligations of the
Distributors to purchase the Notes shall be several and not joint.

                  Notwithstanding the terms of the Distribution  Agreement,  the
Company and the  Distributors  agree that the Company  shall prepare the Pricing
Supplement  within a reasonable  time following the Settlement Date (Issue Date)
for the Senior Notes and, on the date of the filing thereof with the Commission,
to hold the Closing Date specified in Section 3(e) of the Distribution Agreement
at 8:00 A.M., Phoenix time, on such date.

                  If  any   Distributor   or   Distributors   default  in  their
obligations to purchase Notes pursuant to this Terms Agreement and the principal
amount of the Notes that such defaulting  Distributor or Distributors agreed but
failed to purchase is ten percent (10%) or less of the  principal  amount of the
Notes, the Distributors  may make  arrangements  satisfactory to the Company for
the purchase of the Notes by other persons,  including any of the  Distributors,
but if no such  arrangements  are made by the  Settlement  Date (Issue Date) the
nondefaulting  Distributors shall be obligated severally, in proportion to their
respective  commitments  hereunder,  to purchase the Notes that such  defaulting
Distributor or Distributors agreed but failed to purchase. If any Distributor or
Distributors so default and the aggregate principal amount of Notes with respect
to which such default or defaults occur is more than the above described  amount
and arrangements  satisfactory to the remaining Distributors and the Company for
purchase of such Notes by other  persons are not made  within  thirty-six  hours
after such default, this 
                                      -2-

Terms   Agreement  will  terminate   without   liability  on  the  part  of  any
non-defaulting Distributor,  except as provided in Section 9 of the Distribution
Agreement. As used in this Terms Agreement,  the term "Distributor" includes any
person  substituted for a Distributor under this paragraph.  Nothing herein will
relieve a defaulting Distributor from liability for its default.

                  Credit   Suisse   First  Boston   Corporation   is  acting  as
representative  for the  Distributors  specified  in the Pricing  Supplement  in
connection  with the  offering to which this Terms  Agreement  relates,  and any
action  under  this  Terms   Agreement  taken  by  Credit  Suisse  First  Boston
Corporation in such capacity will be binding upon the Distributors to which this
Terms Agreement relates.
                                      -3-

                  This Terms Agreement shall constitute an agreement between the
Company  and the  undersigned  for the sale and  purchase  of the Notes upon the
terms set forth herein and in the Distribution Agreement.

                                  Very truly yours,

                                  CREDIT SUISSE FIRST BOSTON CORPORATION
                                  SALOMON BROTHERS INC

                                  By:  CREDIT SUISSE FIRST BOSTON CORPORATION



                                  By  Helena Willner 
                                    --------------------------------------------
                                      Vice President
Accepted and agreed to as of the date set forth above.

ARIZONA PUBLIC SERVICE COMPANY


By   Nancy E Felker
   ---------------------------------
     Treasurer
                                      -4-