Exhibit 1.1


                         ARIZONA PUBLIC SERVICE COMPANY

                                   SECURITIES

                             UNDERWRITING AGREEMENT

                                                                 October 2, 2001


Credit Suisse First Boston Corporation
J.P. Morgan Securities Inc.
Banc of America Securities LLC
Salomon Smith Barney Inc.
Banc One Capital Markets, Inc.
Barclays Capital, Inc.
  c/o J.P. Morgan Securities Inc.,
      270 Park Avenue, 8th Floor,
      New York, N.Y.  10017

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 $725,000,000
in  aggregate  principal  amount  of its  unsecured  debentures,  notes or other
evidences of indebtedness (the  "Securities")  registered under the registration
statements  referred to in Section 2(a). The Securities will be issued under the
Indenture,  dated as of January  15,  1998,  between  the  Company and The Chase
Manhattan Bank, as Trustee,  (the  "Indenture"),  as amended and supplemented by
one or more Supplemental Indentures between the Company and the Trustee (each, a
"Supplemental  Indenture")  (the 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 "Representatives."

     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. 333-94277) relating to $225,000,000
     of the Securities or the Company's first mortgage bonds (the "Bonds") and a
     registration  statement (No.  333-63994)  relating to  $500,000,000  of the
     Securities or the Bonds (including a combined  prospectus relating to up to
     $725,000,000 of the Securities or Bonds) were filed with the Securities and
     Exchange  Commission (the  "Commission")  and have become  effective.  Such
     registration  statements,  as  each is  amended  at the  time of the  Terms
     Agreement  referred to in Section 3 relating to the  Purchased  Securities,
     are hereinafter  referred to as the "First Registration  Statement" and the
     "Second  Registration  Statement,"  respectively,  and,  together  with any
     related 462(b) registration statement or amendment thereto, are hereinafter
     referred  to  collectively  as  the  "Registration   Statements"  and  such
     prospectus,  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   Statements  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  Statements 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  Statements  that consists of the Statement of Eligibility and
     Qualification (Form T-1) under the Trust Indenture Act of 1939 of The Chase
     Manhattan 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.

                                       2

          (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
     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  Statements,  (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  an  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  Underwriters  or the  Representatives
     promptly  of  any  proposed  amendment  or  supplementation  of  the  First
     Registration   Statement,   the  Second  Registration   Statement,  or  the
     Prospectus.   The  Company  will  also  advise  the   Underwriters  or  the
     Representatives  of the  institution  by the  Commission  of any stop order
     proceedings  in respect  of the First  Registration  Statement,  the Second
     Registration

                                       3

     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  First  Registration
     Statement,  the Second Registration  Statement, or the Prospectus to comply
     with the Act, the Company promptly will notify the  Representatives of such
     event  and 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.  Neither the Representatives' consent to,
     nor the  Underwriters'  delivery of, any such amendment or supplement shall
     constitute a waiver of any of the conditions set forth in Section 5 hereof.

          (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  Second
     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   or  the
     Representatives such copies of the Registration  Statements  (including one
     copy of the Second Registration  Statement for each Representative,  or for
     each Underwriter if there are no  Representatives,  and 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  Underwriters or the  Representatives  designate 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 Underwriters or the Representatives 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

                                       4

     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
     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  Representatives   or,  if  there  are  no   Representatives,   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  Underwriter  or  the
     Representatives.

     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  or the  Representatives  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  Statements 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 Statements 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

                                       5

     stated  on a  basis  substantially  consistent  with  that  of the  audited
     financial   statements   incorporated  by  reference  in  the  Registration
     Statements,  (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  Statements,  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 reference in the Registration Statements, 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  Statements  (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  First
     Registration  Statement,  the Second  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 a majority in  interest  of the  Underwriters  under such Terms
     Agreement, including any Representatives, 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 or 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, and (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 a majority in  interest  of the  Underwriters  under such Terms
     Agreement, including any Representatives,  the effect of any such outbreak,
     escalation,  declaration,  calamity or emergency  makes it  impractical  or
     inadvisable  to proceed with  completion of the sale of and payment for the
     Purchased Securities.

                                       6

          (d) The  Underwriters  or the  Representatives  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
          and has full corporate power and authority to carry on its business as
          presently  conducted;  and the Company is duly  qualified as a foreign
          corporation  to do business  and is in good  standing in the States of
          New Mexico,  California,  Oregon,  Washington,  Montana,  Wyoming, and
          Texas,  the  only  other  jurisdictions  in  which  it owns or  leases
          substantial  properties  or in  which  the  conduct  of  its  business
          requires such qualification;

               (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

                                       7

          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
          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 First Registration Statement and the Second Registration
          Statement have become effective under the Act, and, to the best of the
          knowledge of such counsel,  no stop order suspending the effectiveness
          of  the  First  Registration  Statement  or  the  Second  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  Statements 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,  complied as to form in all
          material  respects  with  the  requirements  of  the  Act,  the  Trust
          Indenture Act, and the published Rules and  Regulations;  such counsel
          has no reason to believe that any part of the Registration Statements,
          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,  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;  the  descriptions  in  the  Registration  Statements  and
          Prospectus  of  statutes,   legal  and  governmental  proceedings  and
          contracts,  and other  documents  are accurate and fairly  present the
          information required to be shown; 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
          documents of a character required to be

                                       8

          described in the Registration  Statements or Prospectus or to be filed
          as exhibits to the Registration  Statements that are not described and
          filed as required (it being  understood that such counsel need express
          no opinion as to the  financial  statements  or other  financial  data
          contained in the Registration Statements or the Prospectus); 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,  (x) Snell & Wilmer L.L.P. may rely (i) solely
     upon  certificates  of the Company as to any factual matters upon which any
     such  opinions are based,  (ii) upon the opinion of Keleher & McLeod,  P.A.
     and referred to below, as to all matters  governed by the laws of the State
     of New Mexico,  but the opinion of Snell & Wilmer L.L.P.  shall state that,
     though they are members of the Arizona Bar and do not hold  themselves  out
     as experts on the laws of the State of New  Mexico,  they have made a study
     of the  laws  of such  State  insofar  as such  laws  are  involved  in the
     conclusions  stated  in  their  opinion,  and from  such  study it is their
     opinion that such laws support such conclusions and that, in their opinion,
     the  Underwriters and they are justified to such extent in relying upon the
     opinion of Keleher & McLeod, P.A., (iii) upon the opinion of Morgan Lewis &
     Bockius LLP as to all matters under the Public Utility Holding Company Act,
     as  amended,  and the  Federal  Power Act,  as  amended,  and (iv) upon the
     opinion of Sullivan & Cromwell  as to all  matters  governed by the laws of
     the State of New York; and (y) the lawyer group referred to in such opinion
     will mean those  lawyers in the  offices of Snell & Wilmer  L.L.P.  who (i)
     have billed any time on the  particular  transaction  to which such opinion
     relates or (ii) have billed  more than ten hours to any  Company  matter in
     the  twelve-month  period  preceding  the  date on  which  the list of such
     lawyers was compiled for purposes of inquiry pursuant to such opinion.

          (e) The  Underwriters  or the  Representatives  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

                                       9

          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 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 or the  Representatives  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  Statements,  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  or the  Representatives  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 First  Registration  Statement or the
     Second  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  or the  Representatives  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.

                                       10

     The Company will furnish the Underwriters or the Representatives  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,
     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  Statements  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 Statements,  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  Statements 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,

                                       11

     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
     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,  (A) then 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

                                       12

     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 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 Underwriters or the  Representatives 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.

                                       13

     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  or 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,  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
                                           -------------------------------------
                                           Name:  Barbara M. Gomez
                                           Title: Treasurer

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

CREDIT SUISSE FIRST BOSTON CORPORATION
J.P. MORGAN SECURITIES INC.
BANC OF AMERICA SECURITIES LLC
SALOMON SMITH BARNEY INC.
BANC ONE CAPITAL MARKETS, INC.
BARCLAYS CAPITAL, INC.

By: J.P. MORGAN SECURITIES INC.
    (As Representative of the Several Underwriters)

    By: Kathryn Sayko
        -----------------------------------
        Kathryn Sayko

                                 TERMS AGREEMENT

                                                                 October 2, 2001


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
$400,000,000  in  aggregate  principal  amount of its 6.375% Notes Due 2011 (the
"Purchased  Securities"),   and  the  Underwriters  hereby  agree  to  purchase,
severally  and not  jointly,  at a purchase  price of  99.018% of the  principal
amount thereof 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
October 2, 2001,  relating to the issuance and sale of up to $725,000,000 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 October 5, 2001 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 October 5, 2001, 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 J.P.  Morgan  Securities  Inc.  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
$400,000,000 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,

                                        CREDIT SUISSE FIRST BOSTON CORPORATION
                                        J.P. MORGAN SECURITIES INC.
                                        BANC OF AMERICA SECURITIES LLC
                                        SALOMON SMITH BARNEY INC.
                                        BANC ONE CAPITAL MARKETS, INC.
                                        BARCLAYS CAPITAL, INC.

                                        BY: J.P. MORGAN SECURITIES INC.
                                             (As Representative of the
                                             Several Underwriters)

                                        By Kathryn Sayko
                                           -------------------------------------
                                           Kathryn Sayko

Confirmed and accepted as of the date first above written.

ARIZONA PUBLIC SERVICE COMPANY


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