Exhibit 1.1


                         ARIZONA PUBLIC SERVICE COMPANY

                              First Mortgage Bonds


                             UNDERWRITING AGREEMENT
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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 $150,000,000
in  aggregate  principal  amount  of its  First  Mortgage  Bonds  (the  "Bonds")
registered  under the registration  statements  referred to in Section 2(a). The
Bonds will be issued  under its  Mortgage  and Deed of Trust dated as of July 1,
1946, to The Bank of New York, as successor Trustee, as amended and supplemented
by fifty-five indentures  supplemental thereto (the "Mortgage"),  and as further
amended  and  supplemented  by one or more  additional  Supplemental  Indentures
relating to the Bonds (the  "Supplemental  Indentures") (the Mortgage as amended
and supplemented by such  Supplemental  Indentures  being sometimes  hereinafter
referred to as the "Indenture"). The Bonds 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 Bonds being determined at the time of sale.  Particular  issues of the Bonds
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 Bonds involved in any such offering are  hereinafter  referred
to as the  "Purchased  Bonds," the parties  that agree to purchase  the same are
hereinafter  referred to as the  "Underwriters" of such Purchased Bonds, 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  Bonds,  the Company  

represents and warrants to, and agrees with, the several Underwriters that:

                  (a) A  registration  statement  (No.  333-15379)  relating  to
         $25,000,000  of  the  Bonds,  unsecured  debentures,  notes,  or  other
         evidences of indebtedness (the  "Securities"),  or the Company's senior
         notes (the "Senior Notes") and a registration  statement (No. 333-____)
         relating  to  $125,000,000  of the Bonds,  Securities  or Senior  Notes
         (including a combined  prospectus relating to up to $150,000,000 of the
         Bonds,  Securities or Senior Notes) 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 Bonds, are
         hereinafter  referred to as the "First Registration  Statement" and the
         "Second Registration Statement,"  respectively,  and, together with any
         related Rule 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 Bonds 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
         Bonds,  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 (a) statements in or omissions  from any such documents  based
         upon written  information  furnished to the Company by any  Underwriter
         specifically  for use  therein  or (b)  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
         Bank of New York, as successor Trustee under the Mortgage.

                  (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 Bonds and the issuance and sale of
         the  Purchased  Bonds on the terms  and  
                                       2

         conditions  herein  and in  the  Prospectus  and  the  Terms  Agreement
         referred  to in  Section 3 relating  to the  Purchased  Bonds,  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 Bonds, except as may
         be required under state securities or blue sky laws.

                  (d) Except for property specifically excepted from the lien of
         the  Indenture  or  released  therefrom  in  accordance  with the terms
         thereof,  the  Company  has good and  marketable  title in fee  simple,
         except for items  described in (A),  (B), and (C) below,  to all of the
         real property  purported in the Indenture to be so held, good and valid
         leasehold interests in all properties  purported in the Indenture to be
         held  under  lease,  and good and valid  title to all other  properties
         described  in the  Indenture  as  subject  to the lien  thereof  (which
         property excludes (i) the combined cycle plant referred to in Note 8 of
         Notes to Financial Statements in the Company's Form 10-K Report for the
         fiscal  year ended  December  31,  1996 (the  "1996 Form 10-K  Report")
         incorporated by reference in the  Registration  Statements but includes
         the Company's  leasehold  and related  interests in that plant and (ii)
         certain leased interests in Unit 2 of the Palo Verde Nuclear Generating
         Station  referred to in Note 8 of Notes to Financial  Statements in the
         1996 Form 10-K Report),  except that the  transmission and distribution
         lines of the Company,  other than those located on land owned in fee by
         the Company,  and the property described in Section 15 of Article IV of
         the Forty-first  Supplemental Indenture,  have been installed in public
         streets or alleys and in highways under  ordinances and permits granted
         by the various  governmental bodies having  jurisdiction,  or have been
         constructed on leaseholds,  easements or  rights-of-way  granted,  with
         minor exceptions, by the apparent owners of record of the land and such
         leases,  easements,  or rights-of-way  are subject to any defects in or
         encumbrances  on the title of the respective  lessors of such leases or
         grantors of such  easements or  rights-of-way;  title to the  aforesaid
         properties  is  subject  only  to:  (A) the lien of the  Mortgage,  (B)
         Excepted Encumbrances as defined in the Mortgage,  and (C) other liens,
         encumbrances  or  defects,  none  of  which,  individually  or  in  the
         aggregate,  materially interfere with the business or operations of the
         Company (with respect to leasehold interests on the Navajo Reservation,
         this  representation  is intended and shall be  understood to mean only
         that the  Company is the owner of the rights  conferred  upon it by the
         leases from the Navajo Tribe  relating to the sites on which the Navajo
         Plant  and the Four  Corners  Plant  are  located,  and that  while the
         Company  is not  aware of the  assertion  of any claim  contesting  the
         interest of the Navajo Tribe in the lands leased,  the Company does not
         give any  representation  with  respect to the  interest  of the Navajo
         Tribe in the lands leased or with respect to the enforceability of such
         leases against the Navajo Tribe);  the 
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         Mortgage,  subject  only  as  above  set  forth  in  this  clause,  now
         constitutes,   and  the  Mortgage  and  the   Supplemental   Indentures
         theretofore  executed,  subject only as above set forth in this clause,
         when  the  latter  shall  have  been  duly  recorded  and  filed,  will
         constitute,  together  and as a single  instrument,  a direct and valid
         first  mortgage  lien upon said  properties,  which  include all of the
         properties of the Company  (other than the classes or items of property
         expressly excepted in the Mortgage); and all properties (other than the
         classes or items of  property  expressly  excepted  in the  Mortgage or
         expressly released from the lien thereof) acquired by the Company after
         the date of the Supplemental  Indenture relating to the Purchased Bonds
         in each  county in the  States of  Arizona  and New Mexico in which the
         Mortgage and the  Supplemental  Indenture shall have been duly recorded
         and filed (and, as to which properties,  with respect to priority only,
         any  necessary   recordation   and/or  filing  has  been  accomplished,
         including  therein any necessary  descriptions of  after-acquired  real
         property  and real  property  upon which  after-acquired  fixtures  are
         affixed)  will,  upon such  acquisition,  become  subject  to the first
         mortgage lien thereof,  subject,  however, to Excepted Encumbrances and
         to  liens,  if any,  existing  or  placed  thereon  at the  time of the
         acquisition  thereof by the Company and, with respect to priority only,
         to  liens,  if  any,  existing  prior  to the  time  of  any  necessary
         recordation and/or filing by the Company.

                  (e) 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 (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) 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,  (E) certain
         minor defects and exceptions may exist which,  individually  and in the
         aggregate,  are not deemed material,  and (F) 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.

         3.  Purchase  and  Offering.  The  obligation  of the  Underwriters  to
purchase, and the obligation of the Company to sell, the Purchased Bonds 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 
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Purchased  Bonds.  The  Terms  Agreement  shall  specify  (by  incorporation  by
reference or  otherwise)  the 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  Bonds 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
Bonds (the "Prospectus Supplement"). It is understood that the Underwriters will
offer  the  Purchased  Bonds  for  sale  as set  forth  in the  Prospectus.  The
obligations of the Underwriters to purchase the Purchased Bonds shall be several
and not joint. Except as may otherwise be set forth in the Terms Agreement,  the
Purchased  Bonds  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 Bonds, 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  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  Bonds 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  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 Bonds,
         the Company will make  generally  available to 
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         its  securityholders 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
         ll(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 Bonds 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  Bonds,  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  Bonds,  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  Bonds,  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 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 mailed by the Company to  stockholders or
         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.
                                       6

                  (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  Bonds with respect to which the Terms
         Agreement  relating to the  Purchased  Bonds 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 Bonds.

                  (h) The  Company  will  not  offer  or sell  any of its  First
         Mortgage  Bonds for a period  beginning at the time of execution of the
         Terms  Agreement  relating  to the  Purchased  Bonds and  ending on the
         Closing Date relating thereto without prior consent of the Underwriters
         or the Representatives.

         5. Conditions of the Obligations of the  Underwriters.  The obligations
of the several  Underwriters to purchase and pay for the Purchased Bonds 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
         examined 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 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 
                                       7

         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  Bonds, (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 Bonds, (ii)
         there shall not have  occurred a suspension  or material  limitation in
         trading in securities  generally on the New York Stock Exchange,  (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 
                                       8

         it impractical or inadvisable to proceed with completion of the sale of
         and payment for the Purchased Bonds.

                  (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 State of New Mexico, the only other
                  jurisdiction in which it owns or leases substantial properties
                  or  in  which  the  conduct  of  its  business  requires  such
                  qualification;

                           (ii) The Purchased  Bonds have been duly  authorized,
                  executed,  authenticated,  issued,  and delivered,  constitute
                  valid and legally binding  obligations of the Company entitled
                  to the benefits and security 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 or
                  the enforcement of the security provided by the Indenture, (b)
                  the necessity  for  compliance  with the statutory  procedural
                  requirements  governing  the exercise of remedies by a secured
                  creditor,  and (c) the  qualification  that  certain  waivers,
                  procedures,  remedies,  and other  provisions of the Purchased
                  Bonds 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 or
                  the enforcement of the security provided by the Indenture, (b)
                  the necessity  for  compliance  with the statutory  procedural
                  requirements  governing  the exercise of remedies by a secured
                  creditor,  and (c) the  qualification  that  certain  waivers,
                  procedures,  
                                       9

                  remedies,  and other provisions of the Purchased Bonds 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) Except for property  specifically  excepted from
                  the lien of the Indenture or released  therefrom in accordance
                  with the terms  thereof,  the Company has good and  marketable
                  title in fee simple,  except for items  described in (A), (B),
                  and  (C)  below,  to all of the  real  property  and  fixtures
                  thereon  purported in the Indenture to be so held and that are
                  both  located in the State of Arizona and  described  in those
                  title reports  covering at least the Saguaro,  Yucca,  Cholla,
                  Ocotillo,  West  Phoenix,  and Palo Verde plant sites that are
                  listed on an exhibit to such opinion  (the "Title  Documents")
                  (in giving such opinion, such counsel may rely solely upon the
                  Title Documents and may assume the accuracy thereof and of the
                  real  property  descriptions  contained  therein and may state
                  that no other  investigation  or  inquiry  has been  made with
                  respect thereto),  and in giving the opinions  described below
                  with respect to any liens,  defects,  and encumbrances on such
                  title to such personal property,  such counsel may assume that
                  the Company  has good and valid  title to all of the  personal
                  property  located in the State of Arizona and described in the
                  Indenture as subject to the lien thereof (which property shall
                  not include fixtures),  and such counsel may rely solely upon,
                  and assume the accuracy of, a search of the Uniform Commercial
                  Code Financing  Statements filed in the records of the Arizona
                  Secretary  of State and may assume  that there are no liens or
                  other  encumbrances  on  personal  property  (as  used  in the
                  Arizona Uniform Commercial Code) of the Company located in the
                  State of Arizona other than liens or other  encumbrances  that
                  have been  perfected  by filing with the Arizona  Secretary of
                  State  under  Arizona  Revised  Statutes   ("A.R.S.")  Section
                  47-9401.A;  such title is subject only to: (A) the lien of the
                  Mortgage,   (B)  Excepted   Encumbrances  as  defined  in  the
                  Mortgage, and (C) other liens, encumbrances,  or defects, none
                  of which,  individually or in the aggregate, in the opinion of
                  such  counsel,  materially  interfere  with  the  business  or
                  operations  of the  Company (in  determining  whether any such
                  other liens,  encumbrances,  or defects  materially  interfere
                  with the business or operations  of the Company,  such counsel
                  may rely solely upon a  certificate  of an officer or engineer
                  of the Company  which  shall be  attached to such  opinion and
                  such opinion may state that no other  investigation or inquiry
                  with respect  thereto has been made);  the  Mortgage,  subject
                  only as above set forth in this clause,  now constitutes,  and
                  the  Mortgage  and  the  
                                       10

                  Supplemental Indentures theretofore executed,  subject only as
                  above set forth in this  clause,  when the  latter  shall have
                  been duly recorded and filed, will constitute, together and as
                  a single  instrument,  a direct and valid first  mortgage lien
                  upon said property; and all properties (other than the classes
                  or items of property  expressly  excepted  in the  Mortgage or
                  expressly  released  from the lien  thereof)  acquired  by the
                  Company after the date of the Supplemental  Indenture relating
                  to the Purchased  Bonds in each county in the State of Arizona
                  in which the Mortgage  and the  Supplemental  Indenture  shall
                  have been  duly  recorded  and  filed  and,  with  respect  to
                  priority  only,  any necessary  recordation  and/or filing has
                  been   accomplished    (including    therein   any   necessary
                  descriptions of after-acquired real property and real property
                  upon which  after-acquired  fixtures are affixed)  will,  upon
                  such  acquisition,  become  subject to the first mortgage lien
                  thereof,  subject,  however,  to Excepted  Encumbrances and to
                  liens,  if any,  existing or placed thereon at the time of the
                  acquisition  thereof  by the  Company  and,  with  respect  to
                  priority only, to liens, if any, existing prior to the time of
                  any necessary recordation and/or filing by the Company;

                           (v) The Company is the owner of the rights  conferred
                  upon it by the leases  from the Navajo  Tribe  relating to the
                  site on which the  Navajo  Plant is  located  and  while  such
                  counsel is not aware of the assertion of any claim  contesting
                  the  title of the  Navajo  Tribe  to the  lands  leased,  such
                  counsel  shall not be required  to express  any  opinion  with
                  respect  to the  interest  of the  Navajo  Tribe in the  lands
                  leased or with  respect to the  enforceability  of such leases
                  against the Navajo Tribe;

                           (vi)  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 
                                       11

                  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;

                           (vii) The issuance and sale of the Purchased Bonds on
                  the terms and conditions set forth or contemplated  herein and
                  in the  Prospectus  and the Terms  Agreement  relating  to the
                  Purchased   Bonds  and  the  execution  and  delivery  of  the
                  Supplemental  Indenture  relating to the Purchased  Bonds 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 Bonds 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;

                           (viii)  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
                  Bonds, 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 
                                       12

                  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 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

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

                  In giving such  opinion,  (a) 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,  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, other than such laws as relate to matters of title, 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.;  and (b) 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;
                                       13

                           (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  Utility  Commission  or any  other
                  public  board or body of the State of New  Mexico is  required
                  for the issuance and sale of the Purchased  Bonds 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  Bonds,  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;

                           (iii)  Assuming  that the  Company has good and valid
                  title to all of the personal  property located in the State of
                  New Mexico and  described  in the  Indenture as subject to the
                  lien  thereof  (which  property  shall not  include  fixtures)
                  ("Personal Property"),  in giving the opinions described below
                  with respect to any liens,  defects and  encumbrances  on such
                  title to such Personal Property,  such counsel may rely solely
                  upon,  and assume  the  accuracy  of, a search of the  Uniform
                  Commercial Code Financing  Statements  filed in the records of
                  the New Mexico  Secretary  of State and may assume  that there
                  are no liens or other  encumbrances  on personal  property (as
                  used in the New Mexico Uniform Commercial Code) of the Company
                  located in the State of New  Mexico  other than liens or other
                  encumbrances  that have been  perfected by filing with the New
                  Mexico Secretary of State under Section  55-9-401,  New Mexico
                  Statutes  Annotated 1978; such title to such Personal Property
                  is subject only to: (A) the lien of the Mortgage, (B) Excepted
                  Encumbrances as defined in the Mortgage,  and (C) other liens,
                  encumbrances,  or defects,  none of which,  individually or in
                  the  aggregate,  in the  opinion of such  counsel,  materially
                  interfere  with the business or  operations of the Company (in
                  determining  whether any such other  liens,  encumbrances,  or
                  defects  materially  interfere with the business or operations
                  of  the   Company,   such  counsel  may  rely  solely  upon  a
                  certificate  of an officer or engineer  of the  Company  which
                  shall be attached to such  opinion and such  opinion may state
                  that no other  investigation  or inquiry with respect  thereto
                  has been made); the Mortgage,  subject only as above set forth
                  in this  clause,  now  constitutes,  and the  Mortgage and the
                  Supplemental Indentures theretofore executed,  subject only as
                  above set forth in this  clause,  when the  
                                       14

                  latter  shall  have  been  duly   recorded  and  filed,   will
                  constitute,  together and as a single instrument, a direct and
                  valid first mortgage lien upon such Personal Property; and all
                  properties  (other  than the  classes  or  items  of  property
                  expressly  excepted in the Mortgage or expressly released from
                  the lien  thereof)  acquired by the Company  after the date of
                  the Supplemental  Indenture relating to the Purchased Bonds in
                  each  county in the State of New Mexico in which the  Mortgage
                  and the  Supplemental  Indenture shall have been duly recorded
                  and filed and,  with respect to priority  only,  any necessary
                  recordation  and/or  filing has been  accomplished  (including
                  therein any  necessary  descriptions  of  after-acquired  real
                  property and real property upon which after-acquired  fixtures
                  are affixed) will,  upon such  acquisition,  become subject to
                  the first mortgage lien thereof, subject, however, to Excepted
                  Encumbrances and to liens, if any,  existing or placed thereon
                  at the time of the  acquisition  thereof by the  Company  and,
                  with  respect to priority  only,  to liens,  if any,  existing
                  prior to the time of any necessary  recordation  and/or filing
                  by the Company; and

                           (iv) The Company is the owner of the rights conferred
                  upon it by the leases  from the Navajo  Tribe  relating to the
                  site on which the Four Corners plant is located and while such
                  counsel is not aware of the assertion of any claim  contesting
                  the  interest of the Navajo  Tribe in the lands  leased,  such
                  counsel  shall not be required  to express  any  opinion  with
                  respect  to the  interest  of the  Navajo  Tribe in the  lands
                  leased or with  respect to the  enforceability  of such leases
                  against the Navajo Tribe.

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  Bonds,  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 
                                       15

         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.

         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 Bonds,  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
                                       16

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 Bonds,
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 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.
                                       17

         (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:  (l) if such
loss,  claim,  damage,  liability,  or action arises under subsection (a) above,
then (i) 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 Bonds or (ii) if the allocation provided by clause (i) above
is not permitted by applicable  law, in such  proportion  as is  appropriate  to
reflect not only the relative  benefits referred to in clause (i) 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 (2) 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  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.  For the  purposes of clause (1) 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 (1) and (2) 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).  No  person   guilty  of   fraudulent
misrepresentation  (within  the  meaning of  Section  ll(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 Bonds pursuant to this Agreement and
the Terms  Agreement  and the  
                                       18

principal  amount  of  Purchased  Bonds  that  such  defaulting  Underwriter  or
Underwriters  agreed but failed to purchase is ten percent  (10%) or less of the
principal amount of Purchased Bonds to which such Terms Agreement  relates,  the
Underwriters or the  Representatives  may make arrangements  satisfactory to the
Company for the purchase of such Purchased Bonds 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  Bonds 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  Bonds 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 Bonds 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 several 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 any  Underwriter  or the Company or any of its  officers or  directors or any
controlling  person,  and will survive delivery of and payment for the Purchased
Bonds. 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  Bonds 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 Bonds 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.
                                       19

         10.  Successors.  This  Agreement  will inure to the  benefit of and be
binding  upon the  parties  hereto and such  Underwriters  as are named in Terms
Agreements  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 several  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  all the
Underwriters of Purchased Bonds 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.
                                       20

         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  several
Underwriters in accordance with its terms.

                                   Very truly yours,

                                   ARIZONA PUBLIC SERVICE COMPANY


                                   By ______________________________________
                                      Treasurer





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



By_________________________________
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