ARIZONA PUBLIC SERVICE CO
8-K, 1999-11-05
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


       Date of Report (Date of earliest event reported): November 2, 1999
                                                         ----------------

                         ARIZONA PUBLIC SERVICE COMPANY
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


            Arizona                    1-4473                  86-0011170
- ----------------------------         ------------         ----------------------
(State or other jurisdiction         (Commission              (IRS Employer
      of incorporation)              File Number)         Identification Number)


400 North Fifth Street, P.O. Box 53999, Phoenix, Arizona           85004
- --------------------------------------------------------           -----
        (Address of principal executive offices)                 (Zip Code)


                                 (602) 250-1000
              ----------------------------------------------------
              (Registrant's telephone number, including area code)


                                      NONE
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)
<PAGE>
ITEM 7. FINANCIAL STATEMENT, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

     (c) Exhibits.

     The  Registrant  hereby files the  following  Exhibits to its  Registration
Statement on Form S-3 (No.  333-58445) which was declared  effective on July 20,
1998.

Exhibit
  No.       Description
- -------     -----------

1.3         Underwriting Agreement and related Terms Agreement, each dated
            November 2, 1999, in connection with the offering of $250,000,000
            of Floating Rate Notes Due 2001.

4.5         Third Supplemental Indenture dated as of November 1, 1999, relating
            to the issuance of $250,000,000 of Floating Rate Notes Due 2001.

4.6         Specimen of Note of Floating Rate Notes Due 2001.

12.3        Computation of Ratio of Earnings to Fixed Charges.
<PAGE>
                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Company  has  duly  caused  this  report  to be  signed  on  its  behalf  by the
undersigned hereunto duly authorized.


                                         ARIZONA PUBLIC SERVICE COMPANY
                                                  (Registrant)



Dated: November 5, 1999                  By: Barbara M. Gomez
                                             -----------------------------------
                                             Barbara M. Gomez
                                             Treasurer

                         ARIZONA PUBLIC SERVICE COMPANY

                                   SECURITIES


                             UNDERWRITING AGREEMENT


                                                                November 2, 1999

Chase Securities Inc.
Credit Suisse First Boston Corporation
Salomon Smith Barney Inc.

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 $275,000,000
in  aggregate  principal  amount  of its  unsecured  debentures,  notes or other
evidences of indebtedness (the  "Securities")  registered under the registration
statement  referred to in Section 2(a). The Securities  will be issued under the
Indenture,  dated as of January  15,  1998,  between  the  Company and The Chase
Manhattan  Bank,  as  Trustee  (the  "Original   Indenture"),   as  amended  and
supplemented by one or more Supplemental  Indentures between the Company and the
Trustee (each, a "Supplemental  Indenture")  (the Original  Indenture as amended
and supplemented by such  Supplemental  Indentures  being sometimes  hereinafter
referred to as the  "Indenture").  The Securities  will be issued in one or more
series,  which  series may vary as to  interest  rates,  maturities,  redemption
provisions,  selling  prices,  and  other  terms,  with all such  terms  for any
particular  issue  of the  Securities  being  determined  at the  time of  sale.
Particular issues of the Securities may be sold from time to time to one or more
of the firms to whom this Agreement is addressed,  and to such other  purchasers
as the Company shall  designate and as shall agree in writing to comply with the
terms and conditions of this Agreement,  for resale in accordance with the terms
of offering  determined at the time of sale. The Securities involved in any such
offering are hereinafter referred to as the "Purchased Securities," the party or
parties  that agree to  purchase  the same are  hereinafter  referred  to as the
"Underwriters"  of  such  Purchased   Securities,   and  the  representative  or
representatives  of the  Underwriters,  if any,  specified in a Terms  Agreement
referred to in Section 3 are hereinafter referred to as the "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. 333-58445) relating to $350,000,000
     of the Securities, the Company's first
<PAGE>
     mortgage  bonds (the "Bonds"),  or the Company's  senior notes (the "Senior
     Notes") (including a combined  prospectus relating to up to $350,000,000 of
     the  Securities,  Bonds or Senior Notes) was filed with the  Securities and
     Exchange  Commission  (the  "Commission")  and has become  effective.  Such
     registration  statement,  as  amended  at the time of the  Terms  Agreement
     referred to in Section 3 relating  to the  Purchased  Securities,  together
     with any related 462(b)  registration  statement or amendment  thereto,  is
     hereinafter   referred  to  as  the   "Registration   Statement"  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   Statement   relating  to  the
     Securities,  when such part became  effective,  conformed  in all  material
     respects to the requirements of the Securities Act of 1933 (the "Act"), the
     Trust  Indenture Act of 1939 (the "Trust  Indenture Act") and the rules and
     regulations  (the "Rules and  Regulations")  of the  Commission and did not
     include  any  untrue  statement  of a  material  fact or omit to state  any
     material  fact  required  to be stated  therein  or  necessary  to make the
     statements  therein  not  misleading,  and on the  date of each  Prospectus
     Supplement  referred to in Section 3, the  Registration  Statement  and the
     Prospectus will conform in all material respects to the requirements of the
     Act, the Trust  Indenture  Act and the Rules and  Regulations,  and at such
     date none of such documents will include any untrue statement of a material
     fact or omit to state any material  fact  required to be stated  therein or
     necessary to make the statements therein not misleading; provided, however,
     that the foregoing  does not apply to (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  Statement 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  has 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
<PAGE>
          (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 (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  Statement,  (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  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:

                                       3
<PAGE>
          (a) The Company will advise the  Underwriters  or the  Representatives
     promptly of any proposed  amendment or  supplementation of the 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 Registration  Statement or of any part
     thereof,  and will use its best efforts to prevent the issuance of any such
     stop order and to obtain as soon as possible its lifting, if issued.

          (b) If,  at any  time  when a  prospectus  relating  to the  Purchased
     Securities is required to be delivered under the Act, any event occurs as a
     result  of which the  Prospectus  as then  amended  or  supplemented  would
     include  an  untrue  statement  of a  material  fact,  or omit to state any
     material fact necessary to make the statements therein, in the light of the
     circumstances  under  which they were  made,  not  misleading,  or if it is
     necessary at any time to amend or supplement the Registration  Statement or
     the  Prospectus  to comply with the Act, the Company  promptly will prepare
     and file with the  Commission an amendment or supplement  that will correct
     such   statement  or  omission  or  an  amendment  that  will  effect  such
     compliance.

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

          (d)  The   Company   will   furnish   to  the   Underwriters   or  the
     Representatives  such copies of the Registration  Statement  (including one
     copy of the  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

                                       4
<PAGE>
     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 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.

          (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) 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

                                       5
<PAGE>
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  Statement comply as to form in all material
     respects with the  applicable  accounting  requirements  of the  Securities
     Exchange  Act of  1934  (the  "1934  Act")  and  the  published  Rules  and
     Regulations  thereunder  and (ii) on the basis of a reading  of the  latest
     available  interim  financial  statements  of  the  Company,  inquiries  of
     officials of the Company  responsible for financial and accounting matters,
     and other specified procedures, nothing came to their attention that caused
     them to believe that (A) the unaudited financial statements incorporated by
     reference,  if any, in the Registration  Statement do not comply as to form
     in all material respects with the applicable accounting requirements of the
     1934 Act and the  published  Rules and  Regulations  thereunder  or are not
     stated  on a  basis  substantially  consistent  with  that  of the  audited
     financial   statements   incorporated  by  reference  in  the  Registration
     Statement, (B) at the date of the most recent available unaudited financial
     statements  and at a  specified  date not more than five days  prior to the
     date of this  Agreement,  there was any  increase  in the amounts of common
     stock, redeemable preferred stock, or non-redeemable preferred stock of the
     Company or any increase,  exceeding  $10,000,000,  in long-term debt of the
     Company or, at the date of the most recent  available  unaudited  financial
     statements  there was any  decrease in net assets as compared  with amounts
     shown in the most recent financial statements  incorporated by reference in
     the Registration Statement, or (C) for the twelve-month period ended at the
     date of the most recent available unaudited financial statements there were
     any decreases, exceeding 3%, as compared with the twelve-month period ended
     at the  date  of the  most  recent  financial  statements  incorporated  by
     reference in the Registration  Statement,  in the amounts of total revenues
     or net income,  except in all cases for increases or decreases which result
     from the  declaration  or payment of dividends,  or which the  Registration
     Statement  (including  any  material  incorporated  by  reference  therein)
     disclose have occurred or may occur, or which are described in such letter.

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

                                       6
<PAGE>
          (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,  (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.

          (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, and constitute valid
          and  legally  binding   obligations  of  the  Company  enforceable  in
          accordance  with  their  terms,  subject  to  bankruptcy,  insolvency,
          fraudulent transfer,

                                       7
<PAGE>
          reorganization,  moratorium, and similar laws of general applicability
          relating  to or  affecting  creditors'  rights and to  general  equity
          principles 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  legally  binding  obligation  of the Company
          enforceable  in  accordance  with its terms,  subject  to  bankruptcy,
          insolvency,  fraudulent  transfer,  reorganization,   moratorium,  and
          similar  laws  of  general  applicability  relating  to  or  affecting
          creditors' rights and to general equity principles;

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

                                       8
<PAGE>
          or  contemplated  herein and in the Prospectus and the Terms Agreement
          relating to the Purchased Securities and the execution and delivery of
          the Supplemental  Indenture relating to the Purchased  Securities have
          been duly  authorized  by the  Arizona  Corporation  Commission,  said
          Commission had jurisdiction in the premises,  and no further approval,
          authorization,  or  consent  of any  other  public  board  or  body is
          necessary to the validity of such issuance and sale of such  Purchased
          Securities  or  the  execution  and  delivery  of  such   Supplemental
          Indenture,  except as may be required  under state  securities or blue
          sky laws,  as to which  laws such  counsel  shall not be  required  to
          express an opinion;

               (vi) The  Registration  Statement has become  effective under the
          Act, and, to the best of the knowledge of such counsel,  no stop order
          suspending the  effectiveness of the  Registration  Statement has been
          issued and no proceedings for that purpose have been instituted or are
          pending  or  contemplated   under  the  Act,  and  each  part  of  the
          Registration  Statement  relating  to the  Securities,  when such part
          became effective, and the Prospectus, as of the date of the Prospectus
          Supplement,  and each  amendment or  supplement  thereto,  as of their
          respective  effective  or  issue  dates,  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  Statement,
          when such part became effective, or the Prospectus,  as of the date of
          the Prospectus Supplement, or as of the Closing Date, or any amendment
          or  supplement  thereto,  as of their  respective  effective  or issue
          dates, or as of the Closing Date,  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  Statement  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
          Statement or Prospectus or to be filed as exhibits to the Registration
          Statement

                                       9
<PAGE>
          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  Statement or the
          Prospectus); and

               (vii)  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,  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.
     In rendering such opinion, Snell & Wilmer L.L.P. may rely as to all matters
     governed  by the laws of the State of New York upon the  opinion of counsel
     for the Underwriters referred to below.

          (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

                                       10
<PAGE>
          necessary  under New Mexico law with  respect to the  maintenance  and
          operation of the  Company's  property and business as now conducted in
          the State of New Mexico and no approval,  authorization, or consent of
          the New Mexico Public Regulation  Commission or any other public board
          or body of the State of New Mexico is required  for the  issuance  and
          sale of the Purchased  Securities on the terms and  conditions  herein
          and in the Prospectus set forth or  contemplated  or for the execution
          of the Supplemental  Indenture  relating to the Purchased  Securities,
          except as may be required  under New Mexico state  securities  or blue
          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 Statement, the Prospectus, and other
     related  matters as may reasonably be required,  and the Company shall have
     furnished to such counsel such documents as they request for the purpose of
     enabling them to pass upon such matters.  In rendering  such opinion,  such
     counsel  may rely as to the  incorporation  of the  Company  and all  other
     matters  governed  by the laws of the States of Arizona and New Mexico upon
     the opinions of Snell & Wilmer L.L.P. and Keleher & McLeod,  P.A., referred
     to above.

          (g) The  Underwriters  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 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.

                                       11
<PAGE>
          (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  Statement  relating to the
     Securities,  when such part became effective, any preliminary prospectus or
     preliminary  prospectus  supplement,  the  Prospectus,  or any amendment or
     supplement  thereto,  or arise out of or are  based  upon the  omission  or
     alleged  omission to state  therein a material  fact  required to be stated
     therein or necessary to make the  statements  therein not  misleading;  and
     will reimburse each  Underwriter and each such  controlling  person for any
     legal or other  expenses  reasonably  incurred by such  Underwriter or such
     controlling  person in connection with  investigating or defending any such
     loss, claim, damage,  liability,  or action;  provided,  however,  that the
     Company  will not be liable in any such  case to the  extent  that any such
     loss, claim,  damage, or liability arises out of or is based upon an untrue
     statement or alleged untrue  statement or omission or alleged omission made
     in any of such  documents in reliance upon and in  conformity  with written
     information  furnished to the Company by any Underwriter  specifically  for
     use therein.  This indemnity agreement will be in addition to any liability
     which the Company may otherwise have.

          (b) Each  Underwriter  will severally  indemnify and hold harmless the
     Company,  each of its  directors,  each of its officers who have signed the
     Registration  Statement,  and each person, if any, who controls the Company
     within the  meaning of the Act,  against any losses,  claims,  damages,  or
     liabilities  to  which  the  Company  or any  such  director,  officer,  or
     controlling person may become subject, under the Act or otherwise,  insofar
     as such losses,  claims,  damages,  or  liabilities  (or actions in respect
     thereof)  arise out of or are based  upon any untrue  statement  or alleged
     untrue

                                       12
<PAGE>
     statement of any material  fact  contained in any part of the  Registration
     Statement relating to the Securities,  when such part became effective, any
     preliminary   prospectus  or   preliminary   prospectus   supplement,   the
     Prospectus,  or any amendment or supplement thereto, or arise out of or are
     based upon the omission or the alleged omission to state therein a material
     fact  required to be stated  therein or  necessary  to make the  statements
     therein not misleading, in each case to the extent, but only to the extent,
     that such  untrue  statement  or alleged  untrue  statement  or omission or
     alleged  omission was made in reliance upon and in conformity  with written
     information  furnished to the Company by such Underwriter  specifically for
     use therein;  and will  reimburse  any legal or other  expenses  reasonably
     incurred  by the  Company or any such  director,  officer,  or  controlling
     person in connection with  investigating or defending any such loss, claim,
     damage,  liability, or action. This indemnity agreement will be in addition
     to any liability which such Underwriter may otherwise have.

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

                                       13
<PAGE>
     or (b) above on the  following  basis:  (1) 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 Securities 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 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 (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  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

                                       14
<PAGE>
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.

     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 85O72-3999,  or delivered,  or telecopied and confirmed to the
Company at 400 North Fifth Street, Phoenix, Arizona 85004.

                                       15
<PAGE>
     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.

                                       16
<PAGE>
     If the foregoing is in accordance with your understanding of our agreement,
kindly sign and return to us the enclosed  duplicate  hereof,  whereupon it will
become  a  binding  agreement  between  the  Company  and  the  Underwriters  in
accordance with its terms.


                                            Very truly yours,

                                            ARIZONA PUBLIC SERVICE COMPANY



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



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

CHASE SECURITIES INC.


By William Dexter Rogers
   -----------------------------------
            Managing Director


CREDIT SUISSE FIRST BOSTON CORPORATION


By Reginald O. Frazier
   -----------------------------------
               Director

SALOMON SMITH BARNEY INC.


By Howard Hiller
   -----------------------------------
            Managing Director

                                       17

<PAGE>
                                 TERMS AGREEMENT


                                                                November 2, 1999

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

Attention:  Treasurer

Dear Madam:

     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
$250,000,000 in aggregate  principal  amount of its Floating Rate Notes Due 2001
(the "Purchased  Securities"),  and the  Underwriters  hereby agree to purchase,
severally and not jointly, at a purchase price of 99.80% 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
November 2, 1999, relating to the issuance and sale of up to $275,000,000 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 November 8, 1999 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  November  8,  1999,  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 Chase 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
$250,000,000 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 such
respective counterparts shall together constitute a single instrument.


                                         Very truly yours,

                                         CHASE SECURITIES INC.
                                         CREDIT SUISSE FIRST BOSTON CORPORATION
                                         SALOMON SMITH BARNEY INC.

                                         By:   CHASE SECURITIES INC.
                                               (As Representative of the
                                               Several Underwriters)


                                               By William Dexter Rogers
                                                  ------------------------------
                                                         Managing Director

Confirmed and accepted as of
the date first above written.

ARIZONA PUBLIC SERVICE COMPANY


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

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

                         ARIZONA PUBLIC SERVICE COMPANY

                                       TO

                            THE CHASE MANHATTAN BANK

                                     TRUSTEE

                          Third Supplemental Indenture

                          Dated as of November 1, 1999

                                       To

                                    Indenture

                          Dated as of January 15, 1998

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


                          Floating Rate Notes Due 2001

                  ---------------------------------------------
<PAGE>
     THIRD SUPPLEMENTAL INDENTURE, dated as of November 1, 1999, between Arizona
Public Service Company, a corporation duly organized and existing under the laws
of the State of Arizona  (herein  called the  "Company"),  having its  principal
office  at 400  North  Fifth  Street,  Phoenix,  Arizona  85004,  and The  Chase
Manhattan  Bank, a New York banking  corporation,  as Trustee (herein called the
"Trustee")  under the Indenture dated as of January 15, 1998 between the Company
and the Trustee (the "Indenture").

                             RECITALS OF THE COMPANY

     The Company has  executed  and  delivered  the  Indenture to the Trustee to
provide for the issuance from time to time of its unsecured debentures, notes or
other evidences of indebtedness (the "Securities"), said Securities to be issued
in one or more series as in the Indenture provided.

     Pursuant to the terms of the Indenture,  the Company desires to provide for
the  establishment of a new series of its Securities to be known as its Floating
Rate Notes Due 2001 (herein called the "Notes Due 2001"), the form and substance
of such Notes Due 2001 and the terms,  provisions,  and conditions thereof to be
set forth as provided in the Indenture and this Third Supplemental Indenture.

     All things  necessary  to make this Third  Supplemental  Indenture  a valid
agreement of the Company,  and to make the Notes Due 2001,  when executed by the
Company and authenticated and delivered by the Trustee, the valid obligations of
the Company, have been done.

          NOW, THEREFORE, THIS THIRD SUPPLEMENTAL INDENTURE WITNESSETH:

     For and in  consideration of the premises and the purchase of the Notes Due
2001 by the Holders  thereof,  and for the purpose of setting forth, as provided
in the  Indenture,  the form and  substance of the Notes Due 2001 and the terms,
provisions,  and conditions  thereof,  it is mutually agreed,  for the equal and
proportionate benefit of all Holders of the Notes Due 2001, as follows:

                                   ARTICLE ONE

                         GENERAL TERMS AND CONDITIONS OF
                               THE NOTES DUE 2001

     SECTION 101. There shall be and is hereby authorized a series of Securities
designated  the "Floating  Rate Notes Due 2001"  limited in aggregate  principal
amount to $250,000,000,  which amount shall be as set forth in any Company Order
for the  authentication and delivery of Notes Due 2001. The Notes Due 2001 shall
mature and the principal shall be due and payable  together with all accrued and
unpaid interest thereon on November 15, 2001, and shall be issued in the form of
registered Notes Due 2001 without coupons.

     SECTION  102.  The Notes Due 2001  shall be  issued in  certificated  form,
except that the Notes Due 2001 shall be issued initially as a Global Security to
and  registered  in the name of Cede & Co., as nominee of The  Depository  Trust
Company, as Depositary therefor. Any Notes Due 2001

                                        2
<PAGE>
to be issued or  transferred  to, or to be held by, Cede & Co. (or any successor
thereof) for such purpose shall bear the depositary  legend in substantially the
form set forth at the top of the form of Note Due 2001 in Article Two hereof (in
lieu of that set forth in Section 204 of the Indenture), unless otherwise agreed
by the Company,  such agreement to be confirmed in writing to the Trustee.  Such
Global  Security  may be  exchanged  in  whole  or in part  for  Notes  Due 2001
registered,  and any transfer of such Global Security in whole or in part may be
registered,  in the name or names of  Persons  other than such  Depositary  or a
nominee thereof only under the circumstances set forth in Clause (2) of the last
paragraph  of  Section  305 of the  Indenture,  or such other  circumstances  in
addition to or in lieu of those set forth in Clause (2) of the last paragraph of
Section 305 of the Indenture as to which the Company shall agree, such agreement
to be confirmed in writing to the Trustee.  Principal  of, and premium,  if any,
and  interest on the Notes Due 2001 will be payable,  the  transfer of Notes Due
2001 will be registrable and Notes Due 2001 will be  exchangeable  for Notes Due
2001  bearing  identical  terms and  provisions,  at the office or agency of the
Company in the Borough of Manhattan,  The City and State of New York;  PROVIDED,
HOWEVER,  that  payment of interest  may be made at the option of the Company by
check  mailed to the  registered  holder at such  address as shall appear in the
Security Register.

     SECTION  103.  Each Note Due 2001 will bear  interest  at the rate of LIBOR
plus 0.72% from November 8, 1999 or from the most recent  Interest  Payment Date
(as  hereinafter  defined) to which  interest has been paid or duly provided for
until the principal  thereof is paid or made  available for payment,  payable on
February 15, May 15, August 15 and November 15 of each year (each,  an "Interest
Payment  Date"),  commencing  on February 15, 2000,  to the person in whose name
such Note Due 2001 or any  Predecessor  Security is registered,  at the close of
business  on  the  fifteenth  calendar  day,  whether  or  not a  Business  Day,
immediately  preceding the Interest Payment Date. Any such interest  installment
not punctually  paid or duly provided for shall forthwith cease to be payable to
the  registered  holders on such  regular  record  date,  and may be paid to the
person in whose name the Note Due 2001 (or one or more  Predecessor  Securities)
is registered  at the close of business on a special  record date to be fixed by
the Trustee for the payment of such defaulted interest,  notice whereof shall be
given to the  registered  holders  of the  Notes  Due 2001 not less than 10 days
prior to such  special  record  date,  or may be paid at any  time in any  other
lawful manner not inconsistent with the requirements of any securities  exchange
on which  the  Notes  Due 2001 may be  listed,  and upon  such  notice as may be
required by such exchange, all as more fully provided in the Indenture.

     The amount of interest payable for any period will be computed on the basis
of a 360-day year for the actual number of days elapsed.  The calculation agent,
initially  The Chase  Manhattan  Bank,  will  calculate the interest rate on the
Notes  Due  2001.  The  interest  rate will be equal to LIBOR  plus  0.72%.  The
interest  rate in effect for the period from  November  8, 1999 to February  15,
2000, the initial  Interest Reset Date, will be LIBOR, as determined on November
4, 1999, plus 0.72% (the "Initial  Interest Rate").  The calculation  agent will
reset the  interest  rate on each  Interest  Payment  Date  (each  such day,  an
"Interest  Reset Date").  The second  London  Business Day preceding an Interest
Reset Date will be the "Interest  Determination  Date" for that  Interest  Reset
Date. The interest rate in effect on each day that is not an Interest Reset Date
will be the interest

                                        3
<PAGE>
rate  determined  as of  the  Interest  Determination  Date  pertaining  to  the
immediately  preceding  Interest  Reset Date. The interest rate in effect on any
day that is an Interest  Reset Date will be the interest  rate  determined as of
the Interest  Determination  Date pertaining to that Interest Reset Date, except
that the interest rate in effect for the period from and  including  November 8,
1999 to the first Interest Reset Date will be the Initial  Interest Rate. If any
Interest Payment Date (other than the Stated Maturity of the Notes Due 2001 or a
Redemption  Date therefor)  would otherwise be a day that is not a Business Day,
the Interest Payment Date will be postponed to the next succeeding Business Day,
except that if such Business Day falls in the next  succeeding  calendar  month,
such Interest Payment Date shall be the immediately  preceding  Business Day. If
the Stated Maturity of the Notes Due 2001 or any Redemption Date therefor is not
a Business Day, then payment of principal and interest payable on such date will
be made on the next  succeeding  day which is a Business  Day (and  without  any
interest or other  payment in respect of any such delay),  in each case with the
same force and effect as if made on such date.  A "Business  Day" shall mean any
day,  except a Saturday,  a Sunday or a legal holiday in The City of New York on
which banking  institutions  are  authorized  or required by law,  regulation or
executive  order to close;  provided that the day is also a London Business Day.
"London  Business Day" means any day on which  dealings in United States dollars
are transacted in the London interbank market.

     The  calculation  agent  will  determine  "LIBOR"  in  accordance  with the
following provisions:

     (i) With respect to any Interest Determination Date, LIBOR will be the rate
     for  deposits in United  States  dollars  having a maturity of three months
     commencing on the first day of the applicable  Interest Period that appears
     on  Telerate  Page 3750 as of 11:00 A.M.,  London  time,  on that  Interest
     Determination Date. If no rate appears,  LIBOR, in respect to that Interest
     Determination  Date,  will be determined in accordance  with the provisions
     described in (ii) below.

     (ii)  With  respect  to an  Interest  Determination  Date on  which no rate
     appears on Telerate Page 3750, as specified in (i) above,  the  calculation
     agent  will  request  the  principal  London  offices of each of four major
     reference  banks  in  the  London  interbank  market,  as  selected  by the
     calculation  agent,  to provide  the  calculation  agent  with its  offered
     quotation  for  deposits in United  States  dollars for the period of three
     months,  commencing on the first day of the applicable  Interest Period, to
     prime banks in the London  interbank  market at  approximately  11:00 A.M.,
     London time, on that Interest  Determination Date and in a principal amount
     that is representative for a single transaction in United States dollars in
     that market at that time. If at least two  quotations  are  provided,  then
     LIBOR on that Interest  Determination  Date will be the arithmetic  mean of
     those quotations.  If fewer than two quotations are provided, then LIBOR on
     the Interest  Determination  Date will be the arithmetic  mean of the rates
     quoted  at  approximately  11:00  A.M.,  in The  City of New  York,  on the
     Interest  Determination  Date by three  major banks in The City of New York
     selected by the  calculation  agent for loans in United  States  dollars to
     leading  European banks,  having a three-month  maturity and in a principal
     amount that is  representative  for a single  transaction  in United States
     dollars in that market at that time; provided,  however,  that if the banks
     selected  by the  calculation  agent are not  providing  quotations  in the
     manner  described by this  sentence,  LIBOR  determined as of that Interest
     Determination  Date will be LIBOR in effect on that Interest  Determination
     Date.

                                        4
<PAGE>
     "Telerate Page 3750" means the display  designated as "Page 3750" on Bridge
Telerate,  Inc., or any  successor  service,  for the purpose of displaying  the
London interbank rates of major banks for United States dollars.

     "Interest Period" means the period from and including November 8, 1999, to,
and  excluding,  the first Interest  Payment Date  thereafter and then from, and
including, the immediately preceding Interest Payment Date to which interest has
been paid or duly provided for to, but excluding, the next Interest Payment Date
or the Maturity of the Notes Due 2001, as the case may be.

     SECTION 104. The Company,  at its option,  may redeem all, or, from time to
time any part of the Notes Due 2001,  on any  Interest  Payment Date on or after
November  15,  2000,  upon notice as provided in the  Indenture  at a Redemption
Price equal to the  principal  amount of the Notes Due 2001 to be redeemed  plus
interest (if any) accrued to the Redemption Date.

     SECTION 105. The Notes Due 2001 shall not be defeasible pursuant to Section
1302 or 1303 of the Indenture.

                                   ARTICLE TWO

                             FORM OF NOTES DUE 2001

     SECTION  201.  The  Notes  Due  2001  and  the  Trustee's   certificate  of
authentication  to be endorsed  thereon are to be substantially in the following
forms:

Form of Face of Security:

UNLESS THIS  CERTIFICATE  IS PRESENTED BY AN  AUTHORIZED  REPRESENTATIVE  OF THE
DEPOSITORY  TRUST COMPANY,  A NEW YORK  CORPORATION  ("DTC"),  TO ARIZONA PUBLIC
SERVICE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT,
AND ANY  CERTIFICATE  ISSUED IS  REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH
OTHER  NAME AS IS  REQUESTED  BY AN  AUTHORIZED  REPRESENTATIVE  OF DTC (AND ANY
PAYMENT  IS MADE TO CEDE & CO. OR TO SUCH  OTHER  ENTITY AS IS  REQUESTED  BY AN
AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR
VALUE OR  OTHERWISE BY OR TO ANY PERSON IS WRONGFUL  INASMUCH AS THE  REGISTERED
OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

                                        5
<PAGE>
                         ARIZONA PUBLIC SERVICE COMPANY

                           Floating Rate Note Due 2001

No. _________                                                       $250,000,000
                                                             CUSIP No. 040555BZ6

     Arizona Public Service  Company,  a corporation duly organized and existing
under the laws of Arizona (herein called the "Company",  which term includes any
successor  Person  under  the  Indenture  hereinafter  referred  to),  for value
received,  hereby  promises to pay to Cede & Co.,  or  registered  assigns,  the
principal sum of Two Hundred Fifty Million  Dollars on November 15, 2001, and to
pay  interest  thereon  from  November 8, 1999 or from the most recent  Interest
Payment Date to which interest has been paid or duly provided for,  quarterly in
arrears  on  February  15,  May 15,  August  15 and  November  15 in each  year,
commencing  February  15,  2000,  at the rate of LIBOR  plus  0.72%,  until  the
principal hereof is paid or made available for payment.

     The calculation  agent,  initially The Chase Manhattan Bank, will calculate
the interest  rate on this  Security.  The interest  rate will be equal to LIBOR
plus 0.72%.  The interest rate in effect for the period from November 8, 1999 to
February 15, 2000, the initial Interest Reset Date, will be LIBOR, as determined
on November 4, 1999, plus 0.72% (the "Initial  Interest Rate").  The calculation
agent will reset the interest rate on each Interest  Payment Date (each such day
an "Interest Reset Date").  The second London Business Day preceding an Interest
Reset Date will be the "Interest  Determination  Date" for that  Interest  Reset
Date. The interest rate in effect on each day that is not an Interest Reset Date
will be the  interest  rate  determined  as of the Interest  Determination  Date
pertaining to the immediately  preceding  Interest Reset Date. The interest rate
in effect on any day that is an Interest  Reset Date will be the  interest  rate
determined  as of the Interest  Determination  Date  pertaining to that Interest
Reset  Date,  except  that the  interest  rate in effect for the period from and
including  November 8, 1999 to the first Interest Reset Date will be the Initial
Interest Rate. The amount of interest payable for any period will be computed on
the basis of a  360-day  year for the  actual  number  of days  elapsed.  If any
Interest  Payment  Date (other than the Stated  Maturity  hereof or a Redemption
Date herefor) would  otherwise be a day that is not a Business Day, the Interest
Payment Date will be postponed to the next succeeding  Business Day, except that
if such Business Day falls in the next succeeding  calendar month, such Interest
Payment  Date shall be the  immediately  preceding  Business  Day. If the Stated
Maturity  hereof or any  Redemption  Date  herefor is not a Business  Day,  then
payment of principal and interest  payable on such date will be made on the next
succeeding  day which is a  Business  Day (and  without  any  interest  or other
payment  in  respect  of any such  delay),  in each case with the same force and
effect as if made on such date.  A "Business  Day" shall mean any day,  except a
Saturday,  a Sunday or a legal  holiday in The City of New York on which banking
institutions are authorized or required by law, regulation or executive order to
close;  provided that the day is also a London  Business Day.  "London  Business
Day" means any day on which  dealings in United States dollars are transacted in
the London interbank market.

     The  calculation  agent  will  determine  "LIBOR"  in  accordance  with the
following provisions:

                                        6
<PAGE>
     (i) With respect to any Interest Determination Date, LIBOR will be the rate
     for  deposits in United  States  dollars  having a maturity of three months
     commencing on the first day of the applicable  Interest Period that appears
     on  Telerate  Page 3750 as of 11:00 A.M.,  London  time,  on that  Interest
     Determination Date. If no rate appears,  LIBOR, in respect to that Interest
     Determination  Date,  will be determined in accordance  with the provisions
     described in (ii) below.

     (ii)  With  respect  to an  Interest  Determination  Date on  which no rate
     appears on Telerate Page 3750, as specified in (i) above,  the  calculation
     agent  will  request  the  principal  London  offices of each of four major
     reference  banks  in  the  London  interbank  market,  as  selected  by the
     calculation  agent,  to provide  the  calculation  agent  with its  offered
     quotation  for  deposits in United  States  dollars for the period of three
     months,  commencing on the first day of the applicable  Interest Period, to
     prime banks in the London  interbank  market at  approximately  11:00 A.M.,
     London time, on that Interest  Determination Date and in a principal amount
     that is representative for a single transaction in United States dollars in
     that market at that time. If at least two  quotations  are  provided,  then
     LIBOR on that Interest  Determination  Date will be the arithmetic  mean of
     those quotations.  If fewer than two quotations are provided, then LIBOR on
     the Interest  Determination  Date will be the arithmetic  mean of the rates
     quoted  at  approximately  11:00  A.M.,  in The  City of New  York,  on the
     Interest  Determination  Date by three  major banks in The City of New York
     selected by the  calculation  agent for loans in United  States  dollars to
     leading  European banks,  having a three-month  maturity and in a principal
     amount that is  representative  for a single  transaction  in United States
     dollars in that market at that time; provided,  however,  that if the banks
     selected  by the  calculation  agent are not  providing  quotations  in the
     manner  described by this  sentence,  LIBOR  determined as of that Interest
     Determination  Date will be LIBOR in effect on that Interest  Determination
     Date.

     "Telerate Page 3750" means the display  designated as "Page 3750" on Bridge
Telerate,  Inc., or any  successor  service,  for the purpose of displaying  the
London interbank rates of major banks for United States dollars.

     "Interest Period" means the period from and including November 8, 1999, to,
and  excluding,  the first Interest  Payment Date  thereafter and then from, and
including, the immediately preceding Interest Payment Date to which interest has
been paid or duly provided for to, but excluding, the next Interest Payment Date
or the Maturity hereof, as the case may be.

     The interest so payable,  and punctually  paid or duly provided for, on any
Interest Payment Date will, as provided in such Indenture, be paid to the Person
in  whose  name  this  Security  (or  one or  more  Predecessor  Securities)  is
registered  at the  close  of  business  on the  Regular  Record  Date  for such
interest,  which shall be the fifteenth  calendar day immediately  preceding the
Interest  Payment Date (whether or not a Business Day). Any such interest not so
punctually  paid or duly provided for will forthwith  cease to be payable to the
Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security (or one or more Predecessor  Securities) is registered at the
close of  business on a Special  Record  Date for the payment of such  Defaulted
Interest to be fixed

                                        7
<PAGE>
by the Trustee,  notice  whereof shall be given to Holders of Securities of this
series not less than 10 days prior to such Special  Record  Date,  or be paid at
any time in any other lawful manner not  inconsistent  with the  requirements of
any  securities  exchange on which the  Securities of this series may be listed,
and upon such  notice as may be  required  by such  exchange,  all as more fully
provided in said Indenture.

     Payment of the principal of (and premium,  if any) and any interest on this
Security will be made at the office or agency of the Company maintained for that
purpose in The City of New York,  in such coin or currency of the United  States
of America as at the time of payment is legal  tender for  payment of public and
private debts;  provided,  however, that at the option of the Company payment of
interest  may be made by check  mailed to the  address  of the  Person  entitled
thereto as such address shall appear in the Security Register.

     Reference  is hereby made to the further  provisions  of this  Security set
forth on the reverse  hereof,  which further  provisions  shall for all purposes
have the same effect as if set forth at this place.

     Unless the  certificate of  authentication  hereon has been executed by the
Trustee  referred to on the reverse  hereof by manual  signature,  this Security
shall  not be  entitled  to any  benefit  under  the  Indenture  or be  valid or
obligatory for any purpose.

     IN WITNESS  WHEREOF,  the  Company has caused  this  instrument  to be duly
executed under its corporate seal.

                                        ARIZONA PUBLIC SERVICE COMPANY


                                        By
                                           -------------------------------------

Attest:


- ----------------------------
Form of Reverse of Security.

     This  Security  is one of a duly  authorized  issue  of  securities  of the
Company (herein called the "Securities"), issued and to be issued in one or more
series  under an  Indenture,  dated as of January  15, 1998  (herein  called the
"Indenture",  which  term  shall  have  the  meaning  assigned  to  it  in  such
instrument),  between  the  Company  and The Chase  Manhattan  Bank,  as Trustee
(herein  called the "Trustee",  which term includes any successor  trustee under
the Indenture), and reference is hereby made to the Indenture for a statement of
the respective rights,  limitations of rights,  duties and immunities thereunder
of the Company, the Trustee and the Holders of the Securities and of the

                                        8
<PAGE>
terms upon which the Securities are, and are to be, authenticated and delivered.
This  Security is one of the series  designated  on the face hereof,  limited in
aggregate principal amount to $250,000,000.

     The Securities of this series are subject to redemption  upon not less than
30 days' notice by mail at the option of the Company,  in whole or in part, from
time to time on any  Interest  Payment  Date on or after  November 15, 2000 at a
Redemption  Price equal to the principal amount of the Securities of this series
to be redeemed plus interest  accrued to the  Redemption  Date (the  "Redemption
Price").

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

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

     The Securities of this series will not be subject to any sinking fund.

     In the event of redemption of this Security in part only, a new Security or
Securities of this series and of like tenor for the  unredeemed  portion  hereof
will be issued in the name of the Holder hereof upon the cancellation hereof.

     If an Event of Default  with  respect to  Securities  of this series  shall
occur and be  continuing,  the principal of the Securities of this series may be
declared  due and  payable in the manner  and with the  effect  provided  in the
Indenture.

     The Indenture  permits,  with certain  exceptions as therein provided,  the
amendment  thereof and the  modification  of the rights and  obligations  of the
Company  and the rights of the  Holders of the  Securities  of each series to be
affected under the Indenture at any time by the Company and the Trustee  without
the consent of such Holders in certain limited circumstances or with the consent
of the  Holders of 66-2/3% in  principal  amount of the  Securities  at the time
Outstanding  of  each  series  to  be  affected.  The  Indenture  also  contains
provisions  permitting the Holders of specified  percentages in principal amount
of the  Securities  of each  series  at the time  Outstanding,  on behalf of the
Holders of all  Securities  of such series,  to waive  compliance by the Company
with certain  provisions of the  Indenture  and certain past defaults  under the
Indenture  and their  consequences.  Any such consent or waiver by the Holder of
this  Security  shall be  conclusive  and binding  upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration

                                        9
<PAGE>
of transfer  hereof or in  exchange  herefor or in lieu  hereof,  whether or not
notation of such consent or waiver is made upon this Security.

     As provided in and subject to the provisions of the  Indenture,  the Holder
of this  Security  shall not have the right to  institute  any  proceeding  with
respect to the Indenture or for the  appointment of a receiver or trustee or for
any other remedy thereunder,  unless such Holder shall have previously given the
Trustee  written  notice of a  continuing  Event of Default  with respect to the
Securities of this series,  the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the  Trustee  to  institute  proceedings  in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have  received  from the Holders of a majority in principal  amount of
Securities of this series at the time Outstanding a direction  inconsistent with
such  request,  and shall have failed to institute any such  proceeding,  for 60
days after receipt of such notice, request and offer of indemnity. The foregoing
shall not apply to any suit  instituted  by the Holder of this  Security for the
enforcement of any payment of principal hereof or any premium or interest hereon
on or after the respective due dates expressed herein.

     No reference  herein to the  Indenture and no provision of this Security or
of the Indenture  shall alter or impair the obligation of the Company,  which is
absolute and unconditional, to pay the principal of and any premium and interest
on this  Security  at the times,  place and rate,  and in the coin or  currency,
herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth,  the transfer of this Security is registrable  in the Security  Register,
upon  surrender of this Security for  registration  of transfer at the office or
agency of the  Company in any place where the  principal  of and any premium and
interest on this  Security are payable,  duly endorsed by, or  accompanied  by a
written  instrument  of  transfer  in form  satisfactory  to the Company and the
Security  Registrar  duly  executed by, the Holder  hereof or his attorney  duly
authorized in writing,  and thereupon one or more new  Securities of this series
and of like  tenor,  of  authorized  denominations  and for the  same  aggregate
principal amount, will be issued to the designated transferee or transferees.

     The Securities of this series are issuable only in registered  form without
coupons  in  denominations  of $1,000  and any  integral  multiple  thereof.  As
provided in the Indenture and subject to certain  limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal amount
of  Securities  of this  series  and of like  tenor  of a  different  authorized
denomination, as requested by the Holder surrendering the same.

     No service  charge shall be made for any such  registration  of transfer or
exchange,  but the Company may require  payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer, the
Company,  the  Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this

                                       10
<PAGE>
Security is registered as the owner hereof for all purposes, whether or not this
Security be overdue,  and  neither the  Company,  the Trustee nor any such agent
shall be affected by notice to the contrary.

     All terms used in this Security  which are defined in the  Indenture  shall
have the meanings assigned to them in the Indenture.

Form of Trustee's Certificate of Authentication.

                          CERTIFICATE OF AUTHENTICATION

     This is one of the Securities of the series designated  therein referred to
in the within-mentioned Indenture.

                                        THE CHASE MANHATTAN BANK
                                                                      AS TRUSTEE


                                        By
                                           -------------------------------------
                                                              AUTHORIZED OFFICER

                                  ARTICLE THREE

                        ORIGINAL ISSUE OF NOTES DUE 2001

     SECTION  301.  Notes  Due  2001  in  the  aggregate   principal  amount  of
$250,000,000 may, upon execution of this Third Supplemental  Indenture,  or from
time to time thereafter, be executed by the Company and delivered to the Trustee
for  authentication,  and the Trustee shall thereupon  authenticate  and deliver
said Notes Due 2001 in accordance  with a Company Order delivered to the Trustee
by the Company, without any further action by the Company.

                                  ARTICLE FOUR

                           PAYING AGENT AND REGISTRAR

     SECTION 401. The Chase Manhattan Bank will be the Paying Agent and Security
Registrar for the Notes Due 2001.

                                       11
<PAGE>
                                  ARTICLE FIVE

                                SUNDRY PROVISIONS

     SECTION 501. For all purposes relating to this Third Supplemental Indenture
and  the  Notes  Due  2001,  the  term  Assistant  Secretary,  when  used in the
Indenture, will include an Associate Secretary of the Company.

     SECTION  502.  Except  as  otherwise   expressly  provided  in  this  Third
Supplemental  Indenture  or in the form of Notes Due 2001 or  otherwise  clearly
required by the context hereof or thereof, all terms used herein or in said form
of Notes Due 2001 that are  defined  in the  Indenture  shall  have the  several
meanings respectively assigned to them thereby.

     SECTION 503. The Indenture,  as heretofore supplemented and amended, and as
supplemented by this Third Supplemental  Indenture,  is in all respects ratified
and confirmed, and this Third Supplemental Indenture shall be deemed part of the
Indenture in the manner and to the extent herein and therein provided.

     SECTION  504.  The  Trustee  hereby  accepts  the trusts  herein  declared,
provided, created,  supplemented, or amended and agrees to perform the same upon
the terms and conditions herein and in the Indenture, as heretofore supplemented
and amended, set forth and upon the following terms and conditions:

     The Trustee shall not be  responsible  in any manner  whatsoever  for or in
respect of the validity or sufficiency of this Third  Supplemental  Indenture or
for or in respect of the recitals  contained  herein,  all of which recitals are
made by the  Company  solely.  In  general,  each and every  term and  condition
contained in Article Six of the Indenture shall apply to and form a part of this
Third Supplemental  Indenture with the same force and effect as if the same were
herein set forth in full with such omissions,  variations,  and  insertions,  if
any, as may be  appropriate  to make the same conform to the  provisions of this
Third Supplemental Indenture.

                                   ----------

     This  instrument  may be  executed in any number of  counterparts,  each of
which so executed shall be deemed to be an original,  but all such  counterparts
shall together constitute but one and the same instrument.

                                       12
<PAGE>
     IN WITNESS WHEREOF,  the parties hereto have caused this Third Supplemental
Indenture  to be duly  executed,  and  their  respective  corporate  seals to be
hereunto affixed and attested, all as of the day and year first above written.

                                        ARIZONA PUBLIC SERVICE COMPANY


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


Attest:

Betsy A. Pregulman
- ------------------------------
     Associate Secretary

                                        THE CHASE MANHATTAN BANK, as Trustee


                                        By: T. J. Foley
                                            ------------------------------------


Attest:

R. Lorenzen
- ------------------------------

                                       13
<PAGE>
STATE OF ARIZONA     )
                     )  ss.:
COUNTY OF MARICOPA   )

     On the 5th day of  November,  1999,  before me  personally  came Barbara M.
Gomez, to me known,  who, being by me duly sworn, did depose and say that she is
the  Treasurer  of  Arizona  Public  Service  Company,  one of the  corporations
described in and which  executed the  foregoing  instrument;  that she knows the
seal of said  corporation;  that the seal  affixed  to said  instrument  is such
corporate seal; that it was so affixed by authority of the Board of Directors of
said corporation; and that she signed her name thereto by like authority.

                                            Debra L. Blondin
                                            ------------------------------------
                                            Notary Public

My Commission Expires:
June 7, 2000
- ----------------------


STATE OF NEW YORK    )
                     )  ss.:
COUNTY OF NEW YORK   )

     On the 4th day of November, 1999, before me personally came T. J. Foley, to
me  known,  who,  being by me duly  sworn,  did  depose  and say that he is Vice
President of The Chase Manhattan Bank, one of the corporations  described in and
which  executed  the  foregoing  instrument;  that  he  knows  the  seal of said
corporation;  that the seal affixed to said  instrument is such corporate  seal;
that  it was so  affixed  by  authority  of  the  Board  of  Directors  of  said
corporation; and that he signed his name thereto by like authority.

                                            Annabelle DeLuca
                                            ------------------------------------
                                            Notary Public

My Commission Expires:
July 15, 2001
- ----------------------

                                       14

UNLESS THIS  CERTIFICATE  IS PRESENTED BY AN  AUTHORIZED  REPRESENTATIVE  OF THE
DEPOSITORY  TRUST COMPANY,  A NEW YORK  CORPORATION  ("DTC"),  TO ARIZONA PUBLIC
SERVICE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT,
AND ANY  CERTIFICATE  ISSUED IS  REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH
OTHER  NAME AS IS  REQUESTED  BY AN  AUTHORIZED  REPRESENTATIVE  OF DTC (AND ANY
PAYMENT  IS MADE TO CEDE & CO. OR TO SUCH  OTHER  ENTITY AS IS  REQUESTED  BY AN
AUTHORIZED  REPRESENTATIVE  OF DTC), ANY TRANSFER , PLEDGE,  OR OTHER USE HEREOF
FOR  VALUE  OR  OTHERWISE  BY OR TO  ANY  PERSON  IS  WRONGFUL  INASMUCH  AS THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.




                         ARIZONA PUBLIC SERVICE COMPANY

                           Floating Rate Note Due 2001

No. 1                                                               $250,000,000
                                                             CUSIP No. 040555BZ6

     Arizona Public Service  Company,  a corporation duly organized and existing
under the laws of Arizona (herein called the "Company",  which term includes any
successor  Person  under  the  Indenture  hereinafter  referred  to),  for value
received,  hereby  promises to pay to Cede & Co.,  or  registered  assigns,  the
principal sum of Two Hundred Fifty Million  Dollars on November 15, 2001, and to
pay  interest  thereon  from  November 8, 1999 or from the most recent  Interest
Payment Date to which interest has been paid or duly provided for,  quarterly in
arrears  on  February  15,  May 15,  August  15 and  November  15 in each  year,
commencing  February  15,  2000,  at the rate of LIBOR  plus  0.72%,  until  the
principal hereof is paid or made available for payment.
<PAGE>
     The calculation  agent,  initially The Chase Manhattan Bank, will calculate
the interest  rate on this  Security.  The interest  rate will be equal to LIBOR
plus 0.72%.  The interest rate in effect for the period from November 8, 1999 to
February 15, 2000, the initial Interest Reset Date, will be LIBOR, as determined
on November 4, 1999, plus 0.72% (the "Initial  Interest Rate").  The calculation
agent will reset the interest rate on each Interest  Payment Date (each such day
an "Interest Reset Date").  The second London Business Day preceding an Interest
Reset Date will be the "Interest  Determination  Date" for that  Interest  Reset
Date. The interest rate in effect on each day that is not an Interest Reset Date
will be the  interest  rate  determined  as of the Interest  Determination  Date
pertaining to the immediately  preceding  Interest Reset Date. The interest rate
in effect on any day that is an Interest  Reset Date will be the  interest  rate
determined  as of the Interest  Determination  Date  pertaining to that Interest
Reset  Date,  except  that the  interest  rate in effect for the period from and
including  November 8, 1999 to the first Interest Reset Date will be the Initial
Interest Rate. The amount of interest payable for any period will be computed on
the basis of a  360-day  year for the  actual  number  of days  elapsed.  If any
Interest  Payment  Date (other than the Stated  Maturity  hereof or a Redemption
Date herefor) would  otherwise be a day that is not a Business Day, the Interest
Payment Date will be postponed to the next succeeding  Business Day, except that
if such Business Day falls in the next succeeding  calendar month, such Interest
Payment  Date shall be the  immediately  preceding  Business  Day. If the Stated
Maturity  hereof or any  Redemption  Date  herefor is not a Business  Day,  then
payment of principal and interest  payable on such date will be made on the next
succeeding  day which is a  Business  Day (and  without  any  interest  or other
payment  in  respect  of any such  delay),  in each case with the same force and
effect as if made on such date.  A "Business  Day" shall mean any day,  except a
Saturday,  a Sunday or a legal  holiday in The City of New York on which banking
institutions are authorized or required by law, regulation or executive order to
close;  provided that the day is also a London  Business Day.  "London  Business
Day" means any day on which  dealings in United States dollars are transacted in
the London interbank market.

     The  calculation  agent  will  determine  "LIBOR"  in  accordance  with the
following provisions:

     (i) With respect to any Interest Determination Date, LIBOR will be the rate
     for  deposits in United  States  dollars  having a maturity of three months
     commencing on the first day of the applicable  Interest Period that appears
     on  Telerate  Page 3750 as of 11:00 A.M.,  London  time,  on that  Interest
     Determination Date. If no rate appears,  LIBOR, in respect to that Interest
     Determination  Date,  will be determined in accordance  with the provisions
     described in (ii) below.

     (ii)  With  respect  to an  Interest  Determination  Date on  which no rate
     appears on Telerate Page 3750, as specified in (i) above,  the  calculation
     agent  will  request  the  principal  London  offices of each of four major
     reference  banks  in  the  London  interbank  market,  as  selected  by the
     calculation  agent,  to provide  the  calculation  agent  with its  offered
     quotation  for  deposits in United  States  dollars for the period of three
     months,  commencing on the first day of the applicable  Interest Period, to
     prime banks in the London  interbank  market at  approximately  11:00 A.M.,
     London time, on that Interest  Determination Date and in a principal amount
     that is representative for a single transaction in United States dollars in
     that market at that time. If at least two quotations

                                        2
<PAGE>
     are provided,  then LIBOR on that Interest  Determination  Date will be the
     arithmetic  mean of those  quotations.  If fewer  than two  quotations  are
     provided,  then  LIBOR  on the  Interest  Determination  Date  will  be the
     arithmetic  mean of the rates quoted at  approximately  11:00 A.M.,  in The
     City of New York, on the Interest  Determination  Date by three major banks
     in The City of New York  selected  by the  calculation  agent  for loans in
     United  States  dollars to leading  European  banks,  having a  three-month
     maturity  and in a  principal  amount that is  representative  for a single
     transaction in United States dollars in that market at that time; provided,
     however,  that if the  banks  selected  by the  calculation  agent  are not
     providing  quotations  in the  manner  described  by this  sentence,  LIBOR
     determined as of that Interest  Determination  Date will be LIBOR in effect
     on that Interest Determination Date.

     "Telerate Page 3750" means the display  designated as "Page 3750" on Bridge
Telerate,  Inc., or any  successor  service,  for the purpose of displaying  the
London interbank rates of major banks for United States dollars.

     "Interest Period" means the period from and including November 8, 1999, to,
and  excluding,  the first Interest  Payment Date  thereafter and then from, and
including, the immediately preceding Interest Payment Date to which interest has
been paid or duly provided for to, but excluding, the next Interest Payment Date
or the Maturity hereof, as the case may be.

     The interest so payable,  and punctually  paid or duly provided for, on any
Interest Payment Date will, as provided in such Indenture, be paid to the Person
in  whose  name  this  Security  (or  one or  more  Predecessor  Securities)  is
registered  at the  close  of  business  on the  Regular  Record  Date  for such
interest,  which shall be the fifteenth  calendar day immediately  preceding the
Interest  Payment Date (whether or not a Business Day). Any such interest not so
punctually  paid or duly provided for will forthwith  cease to be payable to the
Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security (or one or more Predecessor  Securities) is registered at the
close of  business on a Special  Record  Date for the payment of such  Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders of
Securities  of this  series not less than 10 days prior to such  Special  Record
Date,  or be paid at any time in any other lawful manner not  inconsistent  with
the  requirements  of any  securities  exchange on which the  Securities of this
series may be listed,  and upon such notice as may be required by such exchange,
all as more fully provided in said Indenture.

     Payment of the principal of (and premium,  if any) and any interest on this
Security will be made at the office or agency of the Company maintained for that
purpose in The City of New York,  in such coin or currency of the United  States
of America as at the time of payment is legal  tender for  payment of public and
private debts;  provided,  however, that at the option of the Company payment of
interest  may be made by check  mailed to the  address  of the  Person  entitled
thereto as such address shall appear in the Security Register.

     Reference  is hereby made to the further  provisions  of this  Security set
forth on the reverse  hereof,  which further  provisions  shall for all purposes
have the same effect as if set forth at this place.

                                        3
<PAGE>
     Unless the  certificate of  authentication  hereon has been executed by the
Trustee  referred to on the reverse  hereof by manual  signature,  this Security
shall  not be  entitled  to any  benefit  under  the  Indenture  or be  valid or
obligatory for any purpose.

     IN WITNESS  WHEREOF,  the  Company has caused  this  instrument  to be duly
executed under its corporate seal.

                                        ARIZONA PUBLIC SERVICE COMPANY


                                        By Michael V. Palmeri
                                           -------------------------------------
                                           Vice President, Finance

Attest:

Betsy A. Pregulman
- --------------------------------
Associate Secretary

                                        4
<PAGE>
     This  Security  is one of a duly  authorized  issue  of  securities  of the
Company (herein called the "Securities"), issued and to be issued in one or more
series  under an  Indenture,  dated as of January  15, 1998  (herein  called the
"Indenture",  which  term  shall  have  the  meaning  assigned  to  it  in  such
instrument),  between  the  Company  and The Chase  Manhattan  Bank,  as Trustee
(herein  called the "Trustee",  which term includes any successor  trustee under
the Indenture), and reference is hereby made to the Indenture for a statement of
the respective rights,  limitations of rights,  duties and immunities thereunder
of the Company,  the Trustee and the Holders of the  Securities and of the terms
upon which the Securities are, and are to be, authenticated and delivered.  This
Security  is  one of the  series  designated  on the  face  hereof,  limited  in
aggregate principal amount to $250,000,000.

     The Securities of this series are subject to redemption  upon not less than
30 days' notice by mail at the option of the Company,  in whole or in part, from
time to time on any  Interest  Payment  Date on or after  November 15, 2000 at a
Redemption  Price equal to the principal amount of the Securities of this series
to be redeemed plus interest  accrued to the  Redemption  Date (the  "Redemption
Price") .

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

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

     The Securities of this series will not be subject to any sinking fund.

     In the event of redemption of this Security in part only, a new Security or
Securities of this series and of like tenor for the  unredeemed  portion  hereof
will be issued in the name of the Holder hereof upon the cancellation hereof.

     If an Event of Default  with  respect to  Securities  of this series  shall
occur and be  continuing,  the principal of the Securities of this series may be
declared  due and  payable in the manner  and with the  effect  provided  in the
Indenture.

     The Indenture  permits,  with certain  exceptions as therein provided,  the
amendment  thereof and the  modification  of the rights and  obligations  of the
Company and the rights of the

                                        5
<PAGE>
Holders of the  Securities of each series to be affected  under the Indenture at
any time by the Company and the Trustee  without the consent of such  Holders in
certain limited  circumstances  or with the consent of the Holders of 66-2/3% in
principal  amount of the Securities at the time Outstanding of each series to be
affected.  The Indenture  also  contains  provisions  permitting  the Holders of
specified  percentages  in principal  amount of the Securities of each series at
the time Outstanding, on behalf of the Holders of all Securities of such series,
to waive compliance by the Company with certain  provisions of the Indenture and
certain past  defaults  under the  Indenture  and their  consequences.  Any such
consent or waiver by the Holder of this Security shall be conclusive and binding
upon  such  Holder  and upon all  future  Holders  of this  Security  and of any
Security issued upon the  registration of transfer hereof or in exchange herefor
or in lieu  hereof,  whether or not  notation of such  consent or waiver is made
upon this Security.

     As provided in and subject to the provisions of the  Indenture,  the Holder
of this  Security  shall not have the right to  institute  any  proceeding  with
respect to the Indenture or for the  appointment of a receiver or trustee or for
any other remedy thereunder,  unless such Holder shall have previously given the
Trustee  written  notice of a  continuing  Event of Default  with respect to the
Securities of this series,  the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the  Trustee  to  institute  proceedings  in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have  received  from the Holders of a majority in principal  amount of
Securities of this series at the time Outstanding a direction  inconsistent with
such  request,  and shall have failed to institute any such  proceeding,  for 60
days after receipt of such notice, request and offer of indemnity. The foregoing
shall not apply to any suit  instituted  by the Holder of this  Security for the
enforcement of any payment of principal hereof or any premium or interest hereon
on or after the respective due dates expressed herein.

     No reference  herein to the  Indenture and no provision of this Security or
of the Indenture  shall alter or impair the obligation of the Company,  which is
absolute and unconditional, to pay the principal of and any premium and interest
on this  Security  at the times,  place and rate,  and in the coin or  currency,
herein prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth,  the transfer of this Security is registrable  in the Security  Register,
upon  surrender of this Security for  registration  of transfer at the office or
agency of the  Company in any place where the  principal  of and any premium and
interest on this  Security are payable,  duly endorsed by, or  accompanied  by a
written  instrument  of  transfer  in form  satisfactory  to the Company and the
Security  Registrar  duly  executed by, the Holder  hereof or his attorney  duly
authorized in writing,  and thereupon one or more new  Securities of this series
and of like  tenor,  of  authorized  denominations  and for the  same  aggregate
principal amount, will be issued to the designated transferee or transferees.

     The Securities of this series are issuable only in registered  form without
coupons  in  denominations  of $1,000  and any  integral  multiple  thereof.  As
provided in the Indenture and subject to certain  limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal amount
of  Securities  of this  series  and of like  tenor  of a  different  authorized
denomination, as requested by the Holder surrendering the same.

                                        6
<PAGE>
     No service  charge shall be made for any such  registration  of transfer or
exchange,  but the Company may require  payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer, the
Company,  the  Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this  Security is  registered  as the owner  hereof for all
purposes,  whether or not this Security be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

     All terms used in this Security  which are defined in the  Indenture  shall
have the meanings assigned to them in the Indenture.

                                        7
<PAGE>
                          CERTIFICATE OF AUTHENTICATION

     This is one of the Securities of the series designated  therein referred to
in the within-mentioned Indenture.

                                        THE CHASE MANHATTAN BANK
                                                                      AS TRUSTEE

                                        By T. J. Foley
                                           -------------------------------------
                                           AUTHORIZED OFFICER

                                        8

                                  Exhibit 12.3


                         ARIZONA PUBLIC SERVICE COMPANY
                    COMPUTATION OF EARNINGS TO FIXED CHARGES
                             (Thousands of Dollars)

<TABLE>
<CAPTION>
                                                                       Twelve Months Ended
                                     September 30,                         December 31,
                                     ------------- ------------------------------------------------------------

                                         1999         1998         1997         1996         1995        1994
                                      ---------    ---------    ---------    ---------    ---------    --------
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>
Earnings:
  Net Income ......................   $ 130,894a   $ 255,247    $ 251,493    $ 243,471    $ 239,570    $243,486
  Income taxes (1) ................      70,927      159,456      153,324      132,961      141,267     177,244
  Fixed Charges ...................     185,174      188,568      195,055      203,855      214,768     213,581
                                      ---------    ---------    ---------    ---------    ---------    --------
    Total .........................   $ 386,995    $ 603,271    $ 599,872    $ 580,287    $ 595,605    $634,311
                                      =========    =========    =========    =========    =========    ========

Fixed Charges:
  Interest expense ................   $ 141,639    $ 144,695    $ 150,335    $ 158,287    $ 168,175    $166,045
  Amortization of debt discount,
    premium and expense ...........       7,439        7,580        7,791        8,176        8,622       8,854
  Estimated interest portion of
    annual rents (2) ..............      36,096       36,293       36,929       37,392       37,971      38,682
                                      ---------    ---------    ---------    ---------    ---------    --------
    Total .........................   $ 185,174    $ 188,568    $ 195,055    $ 203,855    $ 214,768    $213,581
                                      =========    =========    =========    =========    =========    ========

Ratio of Earnings to Fixed Charges
  (rounded down) ..................        2.08         3.19         3.07         2.84         2.77        2.96

(1) Income Taxes:
     Charged to operations ........   $ 196,344    $ 192,207    $ 184,737    $ 178,513    $ 178,865    $168,202
     Income Tax Benefit-
       Disallowance b .............     (94,115)         N/A          N/A          N/A          N/A         N/A
     Charged (credited) to other
       accounts ...................     (31,302)     (32,751)     (31,413)     (45,552)     (37,598)      9,042
                                      ---------    ---------    ---------    ---------    ---------    --------
       Total ......................   $  70,927    $ 159,456    $ 153,324    $ 132,961    $ 141,267    $177,244
                                      =========    =========    =========    =========    =========    ========

(2) Estimated interest portion of
     Unit 2 lease payments included
     in estimated interest portion
     of annual rentals ............   $  33,990    $  34,315    $  34,720    $  35,083    $  35,422    $ 35,710
                                      =========    =========    =========    =========    =========    ========
</TABLE>

- ----------
a    Net Income for twelve months ended September 1999 reflects an extraordinary
     charge  for a  regulatory  disallowance.

b    Income taxes reported on the Company's income statement are shown excluding
     the effects of the regulatory disallowance.


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