Exhibit 1.1

                         ARIZONA PUBLIC SERVICE COMPANY

                                   SECURITIES

                             UNDERWRITING AGREEMENT
                                                                     May 7, 2003
Dear Sir or Madam:

          1.   INTRODUCTION.   Arizona  Public  Service   Company,   an  Arizona
corporation (the "Company"),  proposes to issue and sell from time to time up to
$500,000,000 in aggregate principal amount of its unsecured debentures, notes or
other  evidences  of  indebtedness  (the  "Securities")   registered  under  the
registration  statement  referred to in Section  2(a).  The  Securities  will be
issued  under  the  Indenture,  dated as of  January  15,  1998  (the  "Original
Indenture"),  between the Company and JPMorgan Chase Bank (formerly known as The
Chase Manhattan Bank), as trustee (the  "Trustee"),  as amended and supplemented
by one or more  Supplemental  Indentures  between  the  Company  and the Trustee
(each,  a  "Supplemental  Indenture")  (the  Original  Indenture  as amended and
supplemented  by  such  Supplemental   Indentures  being  sometimes  hereinafter
referred to as the  "Indenture").  The Securities  will be issued in one or more
series,  which  series may vary as to  interest  rates,  maturities,  redemption
provisions,  selling  prices,  and  other  terms,  with all such  terms  for any
particular  issue  of the  Securities  being  determined  at the  time of  sale.
Particular issues of the Securities may be sold from time to time to one or more
of the firms to whom this Agreement is addressed,  and to such other  purchasers
as the Company shall  designate and as shall agree in writing to comply with the
terms and conditions of this Agreement,  for resale in accordance with the terms
of offering  determined at the time of sale. The Securities involved in any such
offering are hereinafter referred to as the "Purchased Securities," the party or
parties  that agree to  purchase  the same are  hereinafter  referred  to as the
"Underwriters"  of  such  Purchased   Securities,   and  the  representative  or
representatives  of the  Underwriters,  if any,  specified in a Terms  Agreement
referred to in Section 3 are hereinafter referred to as the "Representative."

          2.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY. In connection with
each offering of the Purchased  Securities,  the Company represents and warrants
to, and agrees with, the Underwriters that:

          (a)  A registration statement (No. 333-90824) relating to $500,000,000
     of the  Securities or the Company's  first mortgage bonds (the "Bonds") was
     filed with the Securities and Exchange  Commission (the  "Commission")  and
     has become effective.  Such registration  statement, as amended at the time
     of the Terms  Agreement  referred to in Section 3 relating to the Purchased
     Securities, is hereinafter referred to as the "Registration Statement" and,
     together  with any  related  462(b)  registration  statement  or  amendment
     thereto,  is  hereinafter  referred to  collectively  as the  "Registration
     Statement" and the prospectus  included in the Registration  Statement when
     it became  effective,  as  supplemented  as  contemplated  by  Section 3 to
     reflect  the  terms of the  Purchased  Securities  and  terms  of  offering
     thereof,  including  all material  incorporated  by reference  therein,  is
     hereinafter referred to as the "Prospectus."

          (b)  Each  part  of  the  Registration   Statement   relating  to  the
     Securities,  when such part became  effective,  conformed  in all  material
     respects to the requirements of the Securities Act of 1933 (the "Act"), the
     Trust  Indenture Act of 1939 (the "Trust  Indenture Act") and the rules and
     regulations  (the "Rules and  Regulations")  of the  Commission and did not
     include  any  untrue  statement  of a  material  fact or omit to state  any
     material  fact  required  to be stated  therein  or  necessary  to make the
     statements  therein  not  misleading,  and on the  date of each  Prospectus
     Supplement  referred to in Section 3, the  Registration  Statement  and the
     Prospectus will conform in all material respects to the requirements of the
     Act, the Trust  Indenture  Act and the Rules and  Regulations,  and at such
     date none of such documents will include any untrue statement of a material
     fact or omit to state any material  fact  required to be stated  therein or
     necessary to make the statements therein not misleading; provided, however,
     that the foregoing  does not apply to (i)  statements in or omissions  from
     any such documents based upon written information  furnished to the Company
     by any  Underwriter  specifically  for use therein or (ii) that part of the
     Registration  Statement that consists of the Statement of Eligibility (Form
     T-1) under the Trust  Indenture  Act of 1939 of  JPMorgan  Chase  Bank,  as
     Trustee under the Indenture.

          (c)  An order of the Arizona  Corporation  Commission  shall have been
     granted   authorizing  the  execution  and  delivery  of  the  Supplemental
     Indenture relating to the Purchased Securities and the issuance and sale of
     the  Purchased  Securities  on the terms and  conditions  herein and in the
     Prospectus and the Terms Agreement referred to in Section 3 relating to the
     Purchased  Securities,  and the approval or consent of no other public body
     or  authority  is  necessary  to  the   execution   and  delivery  of  such
     Supplemental  Indenture  or the  validity of the  issuance  and sale of the
     Purchased  Securities,  except as may be required under state securities or
     blue sky laws.

          (d)  The  Company  holds  such  valid   franchises,   certificates  of
     convenience  and  necessity,  licenses,  and permits as are necessary  with
     respect to the  maintenance  and  operation of its property and business as
     now  conducted,  except that (i) the Company  from time to time makes minor
     extensions   of  its  system  prior  to  the  time  a  related   franchise,
     certificate,  license,  or  permit  is  procured,  (ii)  from  time to time
     communities  already being served by the Company  become  incorporated  and
     considerable time may elapse before a franchise is procured,  (iii) certain
     franchises may have expired prior to the  renegotiation  thereof,  (iv) the

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     Company may not have obtained certain permits or variances  relating to the
     environmental  requirements  described in any of its Form 10-K Report,  its
     Form 10-Q Reports, and/or its Form 8-K Reports incorporated by reference in
     the  Registration  Statement,  (v) certain minor defects and exceptions may
     exist which,  individually  and in the aggregate,  are not deemed material,
     and  (vi) the  Company  does not  make  any  representation  regarding  the
     geographical scope of any franchise,  certificate,  license, or permit that
     is not specific as to its geographical scope.

          (e)  The Company is not an "investment company" or entity "controlled"
     by an "investment  company," as such terms are defined in the United States
     Investment Company Act of 1940, as amended (the "1940 Act").

          3.   PURCHASE AND  OFFERING.  The  obligation of the  Underwriters  to
purchase,  and the obligation of the Company to sell,  the Purchased  Securities
will be  evidenced  by an exchange of facsimile  transmission  or other  written
communications  (the "Terms  Agreement")  at the time the Company  determines to
sell  the  Purchased   Securities.   The  Terms   Agreement  shall  specify  (by
incorporation  by  reference  or  otherwise)  the party or parties  that will be
Underwriters,  the principal  amount to be purchased by each, the purchase price
to be paid by the  Underwriters,  any  compensation or commissions to be paid to
Underwriters,  the offering price, and the terms of the Purchased Securities not
already  specified in the  Indenture,  including,  but not limited to,  interest
rates, maturity,  redemption provisions, and sinking fund requirements,  if any.
The Terms  Agreement  shall also  specify  (by  incorporation  by  reference  or
otherwise) the time and date of delivery and payment (the "Closing  Date"),  the
place of delivery  and  payment,  and any details of the terms of offering  that
should be reflected in the prospectus supplement relating to the offering of the
Purchased  Securities (the "Prospectus  Supplement").  It is understood that the
Underwriters  will offer the Purchased  Securities  for sale as set forth in the
Prospectus.  The  obligations  of the  Underwriters  to purchase  the  Purchased
Securities shall be several and not joint.  Except as may otherwise be set forth
in the Terms Agreement,  the Purchased Securities will be in definitive form and
in such  denominations  and  registered  in such names as the  Underwriters  may
request.

          4.   COVENANTS OF THE COMPANY.  In  connection  with each  offering of
Purchased  Securities,  the  Company  covenants  and  agrees  with  the  several
Underwriters that:

          (a)  The  Company  will  advise  the  Representative  promptly  of any
     proposed amendment or supplementation of the Registration  Statement or the
     Prospectus.  The  Company  will  also  advise  the  Representative  of  the
     institution by the  Commission of any stop order  proceedings in respect of
     the Registration  Statement,  or of any part thereof, and will use its best
     efforts to  prevent  the  issuance  of any such stop order and to obtain as
     soon as possible its lifting, if issued.

          (b)  If,  at any time  when a  prospectus  relating  to the  Purchased
     Securities is required to be delivered under the Act, any event occurs as a
     result  of which the  Prospectus  as then  amended  or  supplemented  would
     include  an  untrue  statement  of a  material  fact,  or omit to state any
     material fact necessary to make the statements therein, in the light of the
     circumstances  under  which they were  made,  not  misleading,  or if it is
     necessary at any time to amend or supplement the Registration  Statement or

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     the  Prospectus  to comply with the Act, the Company  promptly will prepare
     and file with the  Commission an amendment or supplement  that will correct
     such   statement  or  omission  or  an  amendment  that  will  effect  such
     compliance.

          (c)  As soon as practicable,  but not later than 18 months,  after the
     date of the Terms  Agreement  relating  to the  Purchased  Securities,  the
     Company will make  generally  available to its security  holders an earning
     statement or statements (which need not be audited) covering a period of at
     least 12 months  beginning  after the  effective  date of the  Registration
     Statement (as defined in Rule 158(c) under the Act), which will satisfy the
     provisions  of  Section  11(a)  of the Act and the  rules  and  regulations
     thereunder.

          (d)  The   Company   will   furnish  to  the   Underwriters   and  the
     Representative  such copies of the  Registration  Statement  (including one
     copy of the  Registration  Statement for the counsel for the  Underwriters,
     which is  signed  and  includes  all  exhibits),  any  related  preliminary
     prospectus  supplements  and the  Prospectus,  including all  amendments or
     supplements to such documents, as may be reasonably requested.

          (e)  The Company will arrange or  cooperate  in  arrangements  for the
     qualification of the Purchased Securities for sale and the determination of
     their  eligibility for investment  under the laws of such  jurisdictions as
     the  Representative  or, if there is no  Representative,  the Underwriters,
     designates  and will  continue  such  qualifications  in  effect so long as
     required for the  distribution of the Purchased  Securities,  provided that
     the Company  shall not be required to qualify as a foreign  corporation  in
     any State,  to  consent to service of process in any State  other than with
     respect to claims  arising  out of the  offering  or sale of the  Purchased
     Securities,  or to  meet  other  requirements  deemed  by  it to be  unduly
     burdensome.

          (f)  During  the  period  of five  years  after  the date of the Terms
     Agreement relating to the Purchased Securities, the Company will furnish to
     the  Representative  thereunder,  and,  upon  request,  each  of the  other
     Underwriters, (i) as soon as practicable after the end of each fiscal year,
     a balance  sheet and  statements  of income and  retained  earnings  of the
     Company as at the end of and for such year,  all in  reasonable  detail and
     certified  by  independent  public  accountants,  and  (ii)  (A) as soon as
     practicable  after the end of each quarterly  fiscal period (except for the
     last  quarterly  fiscal  period of each fiscal  year),  a balance sheet and
     statement  of income of the  Company as at the end of and for such  period,
     all  in  reasonable  detail  and  certified  by a  principal  financial  or
     accounting officer of the Company, (B) as soon as available, a copy of each
     report of the Company filed with the Commission, and (C) from time to time,
     such  other  information  concerning  the  Company  as  may  reasonably  be
     requested.  So long as the Company has active subsidiaries,  such financial
     statements  will be on a  consolidated  basis to the extent the accounts of
     the Company and its subsidiaries are consolidated.

          (g)  The Company will pay all expenses  incident to the performance of
     its obligations  under this Agreement,  and will reimburse the Underwriters
     for any reasonable expenses (including reasonable fees and disbursements of

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     counsel)  incurred  by them in  connection  with the  qualification  of the
     Purchased  Securities with respect to which the Terms Agreement relating to
     the Purchased  Securities has been entered for sale, and the  determination
     of their eligibility for investment,  under the laws of such  jurisdictions
     as the Representative  or, if there is no Representative,  the Underwriters
     designate, and the printing of memoranda relating thereto, and for any fees
     charged by  investment  rating  agencies  for the  rating of the  Purchased
     Securities.

          (h)  Except  for the  issuance  of  commercial  paper in the  ordinary
     course of  business,  the  Company  will not offer or sell any other of its
     Securities  for a period  beginning  at the time of  execution of the Terms
     Agreement  relating to the Purchased  Securities  and ending on the Closing
     Date relating  thereto without prior consent of the  Representative  or, if
     there is no Representative, the Underwriters.

          5.   CONDITIONS  OF  THE   OBLIGATIONS   OF  THE   UNDERWRITERS.   The
obligations of the Underwriters to purchase and pay for the Purchased Securities
will be subject to the accuracy of the  representations  and  warranties  on the
part of the  Company  herein,  to the  accuracy  of the  statements  of  Company
officers made  pursuant to the  provisions  hereof,  to the  performance  by the
Company of its obligations hereunder, and to the following additional conditions
precedent:

          (a)  The  Underwriters  and the  Representative  shall have received a
     letter from DELOITTE & TOUCHE LLP,  dated the date of the Terms  Agreement,
     confirming that they are independent  certified public  accountants  within
     the meaning of the Act and the applicable  published  Rules and Regulations
     thereunder,  and stating in effect that (i) in their  opinion the financial
     statements and schedules of the Company audited by them and incorporated by
     reference in the  Registration  Statement comply as to form in all material
     respects with the  applicable  accounting  requirements  of the  Securities
     Exchange  Act of  1934  (the  "1934  Act")  and  the  published  Rules  and
     Regulations  thereunder  and (ii) on the basis of a reading  of the  latest
     available  interim  financial  statements  of  the  Company,  inquiries  of
     officials of the Company  responsible for financial and accounting matters,
     and other specified procedures, nothing came to their attention that caused
     them to believe that (A) the unaudited financial statements incorporated by
     reference,  if any, in the Registration  Statement do not comply as to form
     in all material respects with the applicable accounting requirements of the
     1934 Act and the  published  Rules and  Regulations  thereunder  or are not
     stated  on a  basis  substantially  consistent  with  that  of the  audited
     financial   statements   incorporated  by  reference  in  the  Registration
     Statement, (B) at the date of the most recent available unaudited financial
     statements  and at a  specified  date not more than five days  prior to the
     date of this  Agreement,  there was any  increase  in the amounts of common
     stock, redeemable preferred stock, or non-redeemable preferred stock of the
     Company or any increase,  exceeding  $10,000,000,  in long-term debt of the
     Company or, at the date of the most recent  available  unaudited  financial
     statements  there was any  decrease in net assets as compared  with amounts
     shown in the most recent financial statements  incorporated by reference in
     the Registration Statement, or (C) for the twelve-month period ended at the
     date of the most recent available unaudited financial statements there were
     any decreases, exceeding 3%, as compared with the twelve-month period ended
     at the  date  of the  most  recent  financial  statements  incorporated  by

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     reference in the Registration  Statement,  in the amounts of total revenues
     or net income,  except in all cases for increases or decreases which result
     from the  declaration  or payment of dividends,  or which the  Registration
     Statement  (including  any  material  incorporated  by  reference  therein)
     disclose have occurred or may occur, or which are described in such letter.

          (b)  No stop order  suspending the  effectiveness  of the Registration
     Statement,  or any part thereof  shall have been issued and no  proceedings
     for that purpose  shall have been  instituted  or, to the  knowledge of the
     Company or the Underwriters, shall be contemplated by the Commission.

          (c)  Subsequent  to the execution of the Terms  Agreement  relating to
     the Purchased Securities,  (i) there shall not have occurred any change, or
     any   development   involving  a  prospective   change,   in  or  affecting
     particularly  the business or properties of the Company or its subsidiaries
     which,  in the  judgment  of the  Representative,  materially  impairs  the
     investment quality of the Purchased  Securities,  (ii) there shall not have
     occurred a  suspension  or  material  limitation  in trading in  securities
     generally on the New York Stock  Exchange or any  suspension  of trading of
     any  securities  of the  Company on any  exchange  in the  over-the-counter
     market,  (iii)  there  shall  not have  occurred  a general  moratorium  on
     commercial banking activities in New York declared by either Federal or New
     York  State  authorities,  (iv)  no  rating  of any of the  Company's  debt
     securities  shall  have been  lowered  and there  shall have been no public
     announcement that any such debt securities have been placed on CreditWatch,
     Watchlist,  or under any similar  surveillance or review, in each case with
     negative implications, by any recognized rating agency, (v) there shall not
     have occurred any outbreak or escalation of major  hostilities in which the
     United States is involved,  any declaration of war by Congress or any other
     substantial  national or  international  calamity or  emergency  if, in the
     judgment  of  the   Representative,   the  effect  of  any  such  outbreak,
     escalation,   declaration,   calamity  or  emergency,  (including,  without
     limitation  an act of  terrorism  that  results  in  any  such  substantial
     national or  international  calamity or emergency)  makes it impractical or
     inadvisable  to proceed with  completion of the sale of and payment for the
     Purchased  Securities,  and (vi) there shall not have occurred any material
     disruption of securities settlement or clearance services.

          (d)  The  Underwriters and the  Representative  shall have received an
     opinion  of Snell & Wilmer  L.L.P.,  counsel  for the  Company,  dated  the
     relevant Closing Date, to the effect that:

               (i)  The  Company  is  a  corporation  duly  organized,   validly
          existing,  and in good standing under the laws of the State of Arizona
          with the full  corporate  power and authority to carry on its business
          as described in the Prospectus; and the Company is duly qualified as a
          foreign  corporation  to do  business  in the  States  of New  Mexico,
          California, Oregon, Washington, Montana, Wyoming, and Texas;

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               (ii) The  Purchased   Securities   have  been  duly   authorized,
          executed,  authenticated,  issued, and delivered, constitute valid and
          legally  binding  obligations of the Company  entitled to the benefits
          provided  by the  Indenture  (except as the same may be limited by (A)
          general   principles   of   equity  or  by   bankruptcy,   insolvency,
          reorganization,  arrangement,  moratorium,  or other laws or equitable
          principles  relating to or affecting  the  enforcement  of  creditors'
          rights  generally  and (B) the  qualification  that  certain  waivers,
          procedures, remedies, and other provisions of the Purchased Securities
          and the Indenture may be unenforceable  under or limited by the law of
          the State of  Arizona;  however,  such law does not in such  counsel's
          opinion   substantially  prevent  the  practical  realization  of  the
          benefits  intended by such  documents) and conform to the  description
          thereof in the Prospectus;

               (iii) The  Indenture  has  been  duly  authorized,  executed, and
          delivered,  has been duly qualified under the Trust Indenture Act, and
          constitutes a valid and binding  instrument  enforceable in accordance
          with  its  terms  except  as the same may be  limited  by (A)  general
          principles  of equity or by  bankruptcy,  insolvency,  reorganization,
          arrangement,   moratorium,  or  other  laws  or  equitable  principles
          relating  to  or  affecting  the  enforcement  of  creditors'   rights
          generally and (B) the qualification that certain waivers,  procedures,
          remedies,  and other  provisions of the Purchased  Securities  and the
          Indenture  may be  unenforceable  under or  limited  by the law of the
          State of Arizona; however, such law does not in such counsel's opinion
          substantially  prevent  the  practical  realization  of  the  benefits
          intended by such documents;

               (iv) With certain  exceptions,  a public  service  corporation is
          required to obtain  certificates of convenience and necessity from the
          Arizona  Corporation  Commission  under  A.R.S.  Section  40-281.A for
          construction  of  its  lines,  plant,  services,  or  systems,  or any
          extensions  thereof,  within  the  State  of  Arizona,  and to  obtain
          franchises   or  similar   consents  or  permits  from   counties  and
          incorporated  municipalities  under  A.R.S.  Section  40-283.A for the
          construction,  operation, and maintenance of transmission lines within
          the State of Arizona;  to the best of such counsel's  knowledge  after
          due inquiry, the Company holds such valid franchises,  certificates of
          convenience  and  necessity,  consents,  and permits  pursuant to such
          statutory  provisions as are necessary with respect to the maintenance
          and  operation of its property and business as now  conducted,  except
          that (A) the Company from time to time makes minor  extensions  of its
          system prior to the time a related franchise, certificate, license, or
          permit is procured,  (B) from time to time  communities  already being
          served by the Company become  incorporated and  considerable  time may
          elapse before a franchise is procured, (C) certain franchises may have
          expired prior to the renegotiation  thereof, (D) certain minor defects
          and exceptions may exist which, individually and in the aggregate, are

                                       7

          not deemed  material,  and (E) such  counsel  need not be  required to
          express any opinion regarding the geographical scope of any franchise,
          certificate,  license,  or  permit  that  is  not  specific  as to its
          geographical scope;

               (v)  The issuance  and sale of the  Purchased  Securities  on the
          terms and  conditions  set  forth or  contemplated  herein  and in the
          Prospectus  and  the  Terms   Agreement   relating  to  the  Purchased
          Securities  and  the  execution  and  delivery  of  the   Supplemental
          Indenture  relating  to  the  Purchased   Securities  have  been  duly
          authorized by the Arizona Corporation Commission,  said Commission had
          jurisdiction in the premises, and no further approval,  authorization,
          or  consent  of any other  public  board or body is  necessary  to the
          validity of such issuance and sale of such Purchased Securities or the
          execution and delivery of such Supplemental  Indenture,  except as may
          be required under state  securities or blue sky laws, as to which laws
          such counsel shall not be required to express an opinion;

               (vi) The  Registration  Statement has become  effective under the
          Act, and, to the best of the knowledge of such counsel,  no stop order
          suspending the  effectiveness of the  Registration  Statement has been
          issued and no proceedings for that purpose have been instituted or are
          pending  or  contemplated   under  the  Act,  and  each  part  of  the
          Registration  Statement  relating  to the  Securities,  when such part
          became effective, and the Prospectus, as of the date of the Prospectus
          Supplement,  and each  amendment or  supplement  thereto,  as of their
          respective  effective or issue dates, other than financial  statements
          and schedules,  and other  financial or  statistical  data included or
          incorporated by reference  therein or omitted  therefrom,  as to which
          such  counsel  need  express no  opinion,  complied  as to form in all
          material  respects  with  the  requirements  of  the  Act,  the  Trust
          Indenture Act, and the published Rules and Regulations.  Although such
          counsel  does not  assume  any  responsibility  for the  accuracy,  or
          completeness   or  fairness  of  the   statements   contained  in  the
          Registration Statement or the Prospectus,  those persons in the lawyer
          group  described  in such  opinion  have no reason to believe that any
          part of the Registration  Statement,  when such part became effective,
          or the Prospectus,  as of the date of the Prospectus Supplement, or as
          of the Closing Date, or any  amendment or  supplement  thereto,  as of
          their respective  effective or issue dates, or as of the Closing Date,
          other than financial statements and schedules,  and other financial or
          statistical  data  included or  incorporated  by reference  therein or
          omitted  therefrom,  as to which such counsel need express no opinion,
          contained any untrue  statement of a material fact or omitted to state
          any material fact  required to be stated  therein or necessary to make
          the statements therein not misleading;  and to the actual knowledge of
          those persons in the lawyer group described in such opinion, there are
          no legal or governmental  proceedings  required to be described in the
          Prospectus  that are not  described as required,  nor any contracts or

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          documents of a character  required to be described in the Registration
          Statement or Prospectus or to be filed as exhibits to the Registration
          Statement  that are not  described  and  filed as  required  (it being
          understood  that  such  counsel  need  express  no  opinion  as to the
          statements of eligibility and  qualification  of the trustee under the
          Indenture); and

               (vii) This  Agreement  and the  Terms  Agreement  have  been duly
          authorized, executed, and delivered by the Company.

               (viii) The  Company is not an  "investment  company" or an entity
          "controlled" by an "investment  company," as such terms are defined in
          the 1940 Act.

          In giving such  opinion,  Snell & Wilmer  L.L.P.  may rely solely upon
     certificates  of the Company as to any factual  matters upon which any such
     opinions are based and may rely upon the opinion of Keleher & McLeod, P.A.,
     referred to below,  as to all matters  governed by the laws of the State of
     New Mexico, and may rely on the opinion of Underwriters'  counsel as to all
     matters governed by the law of the State of New York, and further may relay
     upon the  opinion  of  Morgan,  Lewis & Bockius  LLP,  delivered  to you at
     closing,  as to all matters under the Public Utility Holding Company Act of
     1935, as amended, and the Federal Power Act, as amended.

          (e)  The  Underwriters and the  Representative  shall have received an
     opinion of Keleher & McLeod,  P.A.,  New Mexico  counsel  for the  Company,
     dated the Closing Date, to the effect that:

               (i)  The Company is duly qualified as a foreign corporation to do
          business  and is in good  standing  in the State of New Mexico and has
          full  corporate  power  and  authority  to  engage in the State of New
          Mexico in the business now conducted by it therein; and

               (ii) The  activities of the Company in the State of New Mexico to
          date do not  constitute it a "public  utility" as that term is defined
          in the relevant laws of the State of New Mexico,  and accordingly,  no
          public utility franchises or certificates of convenience and necessity
          are necessary under New Mexico law with respect to the maintenance and
          operation of the  Company's  property and business as now conducted in
          the State of New Mexico and no approval,  authorization, or consent of
          the New Mexico Public Regulation  Commission or any other public board
          or body of the State of New Mexico is required  for the  issuance  and
          sale of the Purchased  Securities on the terms and  conditions  herein
          and in the Prospectus set forth or  contemplated  or for the execution
          of the Supplemental  Indenture  relating to the Purchased  Securities,
          except as may be required  under New Mexico state  securities  or blue

                                       9

          sky laws,  as to which  laws such  counsel  shall not be  required  to
          express an opinion.

     In giving  such  opinion,  Keleher  & McLeod,  P.A.  may rely  solely  upon
     certificates  of the Company as to any factual  matters upon which any such
     opinions are based.

          (f)  The Underwriters and the Representative  shall have received from
     counsel for the  Underwriters  such opinion or opinions,  dated the Closing
     Date, with respect to the incorporation of the Company, the validity of the
     Purchased Securities, the Registration Statement, the Prospectus, and other
     related  matters as may reasonably be required,  and the Company shall have
     furnished to such counsel such documents as they request for the purpose of
     enabling them to pass upon such matters.  In rendering  such opinion,  such
     counsel  may rely as to the  incorporation  of the  Company  and all  other
     matters  governed  by the laws of the States of Arizona and New Mexico upon
     the opinions of Snell & Wilmer L.L.P. and Keleher & McLeod,  P.A., referred
     to above.

          (g)  The  Underwriters  and the  Representative  shall have received a
     certificate  of  the  President  or  any  Vice  President  and a  principal
     financial or accounting officer of the Company,  dated the Closing Date, in
     which  such  officers,  to the best of  their  knowledge  after  reasonable
     investigation,  shall state that the  representations and warranties of the
     Company  in this  Agreement  are true and  correct,  that the  Company  has
     complied with all agreements and satisfied all conditions on its part to be
     performed or satisfied at or prior to the Closing Date,  that no stop order
     suspending the effectiveness of the Registration  Statement has been issued
     and  no  proceedings   for  that  purpose  have  been   instituted  or  are
     contemplated  by the  Commission,  and that,  subsequent to the date of the
     most  recent  financial  statements  in the  Prospectus,  there has been no
     material adverse change in the financial  position or results of operations
     of the Company and its subsidiaries  except as set forth or contemplated in
     the Prospectus or as described in such certificate.

          (h)  The  Underwriters  and the  Representative  shall have received a
     letter of DELOITTE & TOUCHE LLP,  dated the Closing  Date,  which meets the
     requirements  of subsection (a) of this Section,  except that the specified
     date referred to in such  subsection will be a date not more than five days
     prior to the Closing Date for the purposes of this subsection.

          The Company will furnish the Underwriters and the Representative  with
such conformed copies of such opinions, certificates,  letters, and documents as
may be reasonably requested.

          6.   INDEMNIFICATION.

          (a)  The Company will indemnify and hold harmless each Underwriter and
     each person,  if any, who controls such  Underwriter  within the meaning of
     the Act  against  any  losses,  claims,  damages or  liabilities,  joint or
     several,  to which such Underwriter or such  controlling  person may become
     subject,  under  the Act or  otherwise,  insofar  as such  losses,  claims,

                                       10

     damages, or liabilities (or actions in respect thereof) arise out of or are
     based upon any untrue statement or alleged untrue statement of any material
     fact contained in any part of the  Registration  Statement  relating to the
     Securities,  when such part became effective, any preliminary prospectus or
     preliminary  prospectus  supplement,  the  Prospectus,  or any amendment or
     supplement  thereto,  or arise out of or are  based  upon the  omission  or
     alleged  omission to state  therein a material  fact  required to be stated
     therein or necessary to make the  statements  therein not  misleading;  and
     will reimburse each  Underwriter and each such  controlling  person for any
     legal or other  expenses  reasonably  incurred by such  Underwriter or such
     controlling  person in connection with  investigating or defending any such
     loss, claim, damage,  liability,  or action;  provided,  however,  that the
     Company  will not be liable in any such  case to the  extent  that any such
     loss, claim,  damage, or liability arises out of or is based upon an untrue
     statement or alleged untrue  statement or omission or alleged omission made
     in any of such  documents in reliance upon and in  conformity  with written
     information  furnished to the Company by any Underwriter  specifically  for
     use therein.  This indemnity agreement will be in addition to any liability
     which the Company may otherwise have.

          (b)  Each Underwriter  will severally  indemnify and hold harmless the
     Company,  each of its  directors,  each of its officers who have signed the
     Registration  Statement,  and each person, if any, who controls the Company
     within the  meaning of the Act,  against any losses,  claims,  damages,  or
     liabilities  to  which  the  Company  or any  such  director,  officer,  or
     controlling person may become subject, under the Act or otherwise,  insofar
     as such losses,  claims,  damages,  or  liabilities  (or actions in respect
     thereof)  arise out of or are based  upon any untrue  statement  or alleged
     untrue  statement  of  any  material  fact  contained  in any  part  of the
     Registration  Statement  relating to the Securities,  when such part became
     effective, any preliminary prospectus or preliminary prospectus supplement,
     the Prospectus,  or any amendment or supplement thereto, or arise out of or
     are based upon the  omission  or the alleged  omission  to state  therein a
     material  fact  required  to be stated  therein  or  necessary  to make the
     statements therein not misleading,  in each case to the extent, but only to
     the extent,  that such untrue  statement  or alleged  untrue  statement  or
     omission or alleged  omission was made in reliance  upon and in  conformity
     with  written  information  furnished  to the  Company by such  Underwriter
     specifically  for use  therein;  and  will  reimburse  any  legal  or other
     expenses reasonably incurred by the Company or any such director,  officer,
     or controlling  person in connection  with  investigating  or defending any
     such loss, claim,  damage,  liability,  or action. This indemnity agreement
     will be in addition to any liability  which such  Underwriter may otherwise
     have.

          (c)  Promptly after receipt by an indemnified party under this Section
     of notice of the commencement of any action,  such indemnified  party will,
     if a claim in respect thereof is to be made against the indemnifying  party
     under this  Section,  notify  the  indemnifying  party of the  commencement
     thereof;  but the  omission  so to notify the  indemnifying  party will not
     relieve it from any  liability  that it may have to any  indemnified  party
     otherwise  than  under  this  Section.  In case any such  action is brought
     against any indemnified  party, and it notifies the  indemnifying  party of
     the  commencement  thereof,  the  indemnifying  party will be  entitled  to
     participate  therein and, to the extent that it may wish,  jointly with any

                                       11

     other indemnifying party similarly notified, to assume the defense thereof,
     with counsel satisfactory to such indemnified party (who shall not, without
     the  consent of the  indemnified  party,  be  counsel  to the  indemnifying
     party),  and after notice from the  indemnifying  party to such indemnified
     party of its election so to assume the defense  thereof,  the  indemnifying
     party will not be liable to such  indemnified  party under this Section for
     any legal or other expenses subsequently incurred by such indemnified party
     in  connection  with the defense  thereof  other than  reasonable  costs of
     investigation. An indemnifying party shall not be liable for any settlement
     of a claim or action effected without its written consent,  which shall not
     be unreasonably withheld.

          (d)  If  the   indemnification   provided   for  in  this  Section  is
     unavailable or insufficient  to hold harmless an indemnified  party for any
     loss, claim,  damage,  liability,  or action described in subsection (a) or
     (b) above, then each indemnifying party shall contribute to the amount paid
     or payable by such  indemnified  party as a result of the  losses,  claims,
     damages or  liabilities  referred to in subsection  (a) or (b) above on the
     following  basis: (i) if such loss,  claim,  damage,  liability,  or action
     arises  under  subsection  (a)  above,  then (A) in such  proportion  as is
     appropriate to reflect the relative benefits received by the Company on the
     one  hand and the  Underwriters  on the  other  from  the  offering  of the
     Securities  or (B) if the  allocation  provided  by clause (A) above is not
     permitted  by  applicable  law, in such  proportion  as is  appropriate  to
     reflect not only the relative  benefits referred to in clause (A) above but
     also the relative fault of the Company on the one hand and the Underwriters
     on the other in connection  with the statements or omissions which resulted
     in such  losses,  claims,  damages  or  liabilities  as  well as any  other
     relevant equitable  considerations;  and (ii) if such loss, claim,  damage,
     liability,  or action  arises  under  subsection  (b)  above,  then in such
     proportion as is  appropriate  to reflect the relative fault of the Company
     on the one hand and the  Underwriter  on the other in  connection  with the
     statements or omissions which resulted in such losses,  claims,  damages or
     liabilities as well as any other relevant equitable considerations. For the
     purposes of clause (i) above, the relative benefits received by the Company
     on the one hand and the  Underwriters on the other shall be deemed to be in
     the same  proportion  as the total net proceeds  from the offering  (before
     deducting  expenses) received by the Company bear to the total underwriting
     discounts and commissions received by the Underwriters. For the purposes of
     clauses (i) and (ii) above,  the  relative  fault  shall be  determined  by
     reference  to,  among other  things,  whether the untrue or alleged  untrue
     statement of a material fact or the omission or alleged omission to state a
     material  fact  relates  to  information  supplied  by the  Company  or the
     Underwriters  and  the  parties'  relative  intent,  knowledge,  access  to
     information and opportunity to correct or prevent such untrue  statement or
     omission.  The  amount  paid by an  indemnified  party as a  result  of the
     losses, claims, damages or liabilities referred to in the first sentence of
     this  subsection (d) shall be deemed to include any legal or other expenses
     reasonably   incurred  by  such   indemnified   party  in  connection  with
     investigating or defending any action or claim which is the subject of this
     subsection (d).  Notwithstanding  the provisions of this subsection (d), no
     Underwriter  shall be  required to  contribute  any amount in excess of the
     amount  by  which  the  total  price  at  which  the  Purchased  Securities
     underwritten by it and distributed to the public were offered to the public
     exceeds the amount of any damages which such Underwriter has otherwise been
     required to pay by reason of such  untrue or alleged  untrue  statement  or

                                       12

     omission   or   alleged   omission.   No  person   guilty   of   fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Act) shall be
     entitled  to  contribution  from  any  person  who was not  guilty  of such
     fraudulent   misrepresentation.   The  Underwriters'  obligations  in  this
     subsection (d) to contribute are several in proportion to their  respective
     underwriting obligations and not joint.

          7.   DEFAULT  OF  UNDERWRITERS.  If any  Underwriter  or  Underwriters
default in their obligations to purchase Purchased  Securities  pursuant to this
Agreement  and  the  Terms  Agreement  and the  principal  amount  of  Purchased
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase  is ten  percent  (10%) or less of the  principal  amount of  Purchased
Securities to which such Terms  Agreement  relates,  the  Representative  or, if
there is no Representative, the Underwriters, may make arrangements satisfactory
to the Company for the purchase of such  Purchased  Securities by other persons,
including any of the  Underwriters,  but if no such arrangements are made by the
Closing Date the nondefaulting  Underwriters  shall be obligated  severally,  in
proportion  to their  respective  commitments  hereunder  and under  such  Terms
Agreement, to purchase the Purchased Securities that such defaulting Underwriter
or  Underwriters   agreed  but  failed  to  purchase.   If  any  Underwriter  or
Underwriters  so  default  and  the  aggregate  principal  amount  of  Purchased
Securities with respect to which such default or defaults occur is more than the
above-described   amount  and   arrangements   satisfactory   to  the  remaining
Underwriters  and the Company for the purchase of such  Purchased  Securities by
other persons are not made within thirty-six hours after such default, the Terms
Agreement will  terminate  without  liability on the part of any  non-defaulting
Underwriter  or the  Company,  except as  provided in Section 8. As used in this
Agreement,  the  term  "Underwriter"  includes  any  person  substituted  for an
Underwriter  under  this  Section.  Nothing  herein  will  relieve a  defaulting
Underwriter from liability for its default.

          8.   SURVIVAL  OF  CERTAIN   REPRESENTATIONS   AND  OBLIGATIONS.   The
respective  indemnities,  agreements,  representations,  warranties,  and  other
statements of the Company or its officers and of the  Underwriters  set forth in
or made  pursuant  to this  Agreement  will  remain  in full  force  and  effect
regardless of any investigation, or statement as to the results thereof, made by
or on  behalf of the  Underwriters  or the  Company  or any of its  officers  or
directors or any controlling  person,  and will survive  delivery of and payment
for the Purchased  Securities.  If any Terms Agreement is terminated pursuant to
Section 7, or if for any reason a purchase  pursuant to any Terms  Agreement  is
not  consummated,  the Company shall remain  responsible  for the expenses to be
paid or reimbursed by it pursuant to Section 4 and the respective obligations of
the Company and the Underwriters pursuant to Section 6 shall remain in effect.

          9.   NOTICES. All communications hereunder relating to any offering of
Purchased Securities will be in writing,  and, if sent to the Underwriters,  may
be mailed,  delivered,  or telecopied and confirmed to the Representative  first
named in the  Terms  Agreement  relating  to such  Purchased  Securities  at the
address  furnished to the Company in writing for the purpose of  communications,
as follows:  Attention:  Debt Capital Markets, Power Group (with copy to General
Counsel at the same address),  at 745 Seventh Avenue,  New York, New York 10019,
or if  there  is no  Representative,  to the  Underwriters  at  their  addresses
furnished to the Company in writing for the purpose of communications; provided,
however, that any notice to an Underwriter pursuant to Section 6 will be mailed,

                                       13

delivered,  or  telecopied  and  confirmed to each such  Underwriter  at its own
address.  All  communications  hereunder  to the Company  shall be mailed to the
Company,  Attention:  Treasurer, at P.O. Box 53999, Phoenix, Arizona 85072-3999,
or  delivered,  or  telecopied  and  confirmed to the Company at 400 North Fifth
Street, Phoenix, Arizona 85004.

          10.  SUCCESSORS.  This  Agreement  will inure to the benefit of and be
binding upon the parties hereto and the Underwriter or Underwriters as are named
in any Terms  Agreement  and their  respective  successors  and the officers and
directors and controlling  persons referred to in Section 6, and no other person
will have any right or obligation hereunder.

          11.  REPRESENTATION OF UNDERWRITERS. The Representatives,  if any, may
act for the  Underwriters  in  connection  with  any  offering  to which a Terms
Agreement  may  relate,  and any  action  under  this  Agreement  or such  Terms
Agreement taken by the Representatives jointly or the Representative first named
in such Terms  Agreement in such capacity will be binding upon the  Underwriters
of Purchased Securities to which such Terms Agreement relates.

          12.  EXECUTION IN COUNTERPART.  This Agreement and any Terms Agreement
may be executed in one or more counterparts, each of which shall be deemed to be
an original,  but all such respective  counterparts shall together  constitute a
single instrument.

                                       14

          If the  foregoing  is in  accordance  with your  understanding  of our
agreement, kindly sign and return to us the enclosed duplicate hereof, whereupon
it will become a binding  agreement  between the Company and the Underwriters in
accordance with its terms.

                                        Very truly yours,

                                        ARIZONA PUBLIC SERVICE COMPANY


                                        By Barbara M. Gomez
                                           -------------------------------------
                                           Treasurer


The foregoing  Underwriting Agreement is hereby confirmed and accepted as of the
date first above written.

LEHMAN BROTHERS


By Victor Forte
   ------------------------------------
   As Representative

                                       15

                                 TERMS AGREEMENT

                                                                     May 7, 2003

Arizona Public Service Company
400 North Fifth Street
Phoenix, Arizona 85004

Attention: Treasurer

Ladies and Gentlemen:

     Arizona Public Service Company (the "Company") hereby agrees to sell to the
several  Underwriters (the  "Underwriters")  listed in the Company's  Prospectus
Supplement  (the  "Prospectus  Supplement")  of even date  herewith  relating to
$300,000,000  in  aggregate  principal  amount of its 4.650% Notes due 2015 (the
"2015 Notes") and $200,000,000 in aggregate principal amount of its 5.625% Notes
due 2033 (the "2033  Notes") (the 2015 Notes and the 2033 Notes are  hereinafter
collectively  referred to as the "Purchased  Securities"),  and the Underwriters
hereby agree to purchase,  severally  and not  jointly,  at a purchase  price of
98.564% of the  principal  amount of the 2015 Notes and 97.981% of the principal
amount of the 2033 Notes,  plus any accrued  interest  from the date of original
issuance,  the respective  principal  amounts of Purchased  Securities set forth
opposite the names of the Underwriters in the Prospectus Supplement. The sale of
the  Purchased  Securities  by the  Company  and  the  purchase  thereof  by the
Underwriters shall be made on the basis of the representations,  warranties, and
agreements   contained  in  the   Underwriting   Agreement  (the   "Underwriting
Agreement"),  dated May 7,  2003,  relating  to the  issuance  and sale of up to
$500,000,000  of the Company's  Securities  under the Company's  Indenture,  and
shall be  subject  to the terms and  conditions  set forth in such  Underwriting
Agreement.  The provisions of the Underwriting Agreement are incorporated herein
by  reference.  As  contemplated  by  Section 3 of the  Underwriting  Agreement,
certain  terms of the  Purchased  Securities  are  described  in the  Prospectus
Supplement.

     The Underwriters propose to offer the Purchased Securities to the public in
the manner and upon the terms set out in the Prospectus Supplement.

     On May 12, 2003 the Company will deliver the  Purchased  Securities  to the
Underwriters in book-entry  form through the facilities of The Depository  Trust
Company at the office of the Company, 400 North Fifth Street,  Phoenix,  Arizona
85004,  against  payment of the purchase  price by transfer of funds by Fed Wire
from the  Underwriters  to the Company's  account at a bank in Phoenix,  Arizona
designated  by the  Company.  Such  purchase  price  will be deemed to have been
received by the Company  upon the  Company's  receipt of the Fed Wire  reference
number relating to such transfer of funds.  Closing shall occur at the office of
the Company,  400 North Fifth Street,  Phoenix,  Arizona,  at 8:00 a.m.  Phoenix
time,  on May 12, 2003, or at such other time and date as the  Underwriters  and

the Company may agree upon in writing,  such time and date being  referred to as
the  "Closing  Date."  All of  the  Purchased  Securities  referred  to in  this
paragraph  shall be in global form and  registered in the name of Cede & Co. and
deposited with The Depository Trust Company, as depositary.

     If the  foregoing  is  acceptable  to you,  please sign below and  transmit
evidence of such signing to Lehman  Brothers at your  earliest  convenience.  At
that point, the agreement  signified hereby will constitute the Terms Agreement,
as described in the Underwriting Agreement,  with respect to the $500,000,000 of
Purchased Securities referred to herein.

     All capitalized  terms herein,  not otherwise  defined herein,  are used as
defined in the Underwriting Agreement.  This agreement may be executed in one or
more counterparts,  each of which shall be deemed to be an original,  but all of
such respective counterparts shall together constitute a single instrument.

                                        Very truly yours,

                                        Citigroup Global Markets Inc.
                                        Barclays Capital Inc.
                                        Banc of America Securities LLC
                                        Banc One Capital Markets, Inc.
                                        BNY Capital Markets, Inc.
                                        J.P. Morgan Securities Inc.
                                        KBC Financial Products USA Inc.
                                        UBS Warburg LLC

                                        By:  LEHMAN BROTHERS INC.
                                             (As Representative of the Several
                                             Underwriters)

                                        By: Barbara M. Gomez
                                            ------------------------------------

Confirmed and accepted as
of the date first above written.


ARIZONA PUBLIC SERVICE COMPANY


By Victor Forte
   ------------------------------
   Treasurer