ARIZONA PUBLIC SERVICE CO
S-3, 2000-01-07
ELECTRIC & OTHER SERVICES COMBINED
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     As filed with the Securities and Exchange Commission on January 7, 2000
                                                      Registration No. 333-
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                   ----------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
                                   ----------


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

        ARIZONA                                                86-0011170
(State of incorporation)                                     (I.R.S. Employer
                                                          Identification Number)

                             400 North Fifth Street
                             Phoenix, Arizona 85004
                                 (602) 250-1000
    (Address, including zip code and telephone number, including area code,
                  of registrant's principal executive offices)

                                   ----------

                               MATTHEW P. FEENEY
                             Snell & Wilmer L.L.P.
                               One Arizona Center
                             Phoenix, Arizona 85073
                                 (602) 382-6239
            (Name, address, including zip code and telephone number,
                   including area code, of agent for service)

                                   ----------

     Approximate date of commencement of proposed sale to the public:  From time
to time after the effective date of this Registration  Statement,  as determined
by market conditions and other factors.

                                   ----------

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. [ ]
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]
     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  Registration  Statement  number  of the  earlier
effective registration statement for the same offering. [ ]
     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]
     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box. [X]

                                   ----------
<TABLE>
<CAPTION>
                             CALCULATION OF REGISTRATION FEE
========================================================================================
                                                Proposed      Proposed
                                                Maximum       Maximum
                                   Amount       Offering     Aggregate      Amount of
   Title of Each Class of          to be         Price        Offering     Registration
 Securities to be Registered     Registered     Per Unit       Price           Fee
- ----------------------------------------------------------------------------------------
<S>                            <C>             <C>         <C>            <C>
First Mortgage Bonds  ......       (1)(3)         (2)        (1)(2)(3)         N/A
Debt Securities ............       (1)(4)         (2)        (1)(2)(4)         N/A
 Total  ....................    $500,000,000      (2)       $500,000,000   $  132,000(5)
========================================================================================
</TABLE>

(1)  In no event will the aggregate  initial  offering  price of all  securities
     issued from time to time  pursuant to this  Registration  Statement  exceed
     $500,000,000.  If any such  securities  are  issued  at an  original  issue
     discount,  then the aggregate initial offering price as so discounted shall
     not exceed  $500,000,000,  notwithstanding that the stated principal amount
     of such securities may exceed such amount.
(2)  The proposed  maximum  initial  offering price per unit will be determined,
     from time to time, by the Registrant in connection with the issuance by the
     Registrant of the securities registered hereunder.
(3)  Subject  to  Footnote  (1),  there  are  being   registered   hereunder  an
     indeterminate principal amount of First Mortgage Bonds as may be sold, from
     time to time, by the Registrant.
(4)  Subject  to  Footnote  (1),  there  are  being   registered   hereunder  an
     indeterminate principal amount of Debt Securities as may be sold, from time
     to time, by the Registrant.
(5)  Calculated  pursuant to Rule 457(o) of the rules and regulations  under the
     Securities Act of 1933.

     Pursuant to Rule 429 of the rules and regulations  under the Securities Act
of 1933, this Registration  Statement contains a combined prospectus relating to
the  $500,000,000   principal  amount  of  securities   registered   hereby  and
$25,000,000  principal amount of securities registered on July 20, 1998 pursuant
to Registration No. 333-58445.  The previously-paid  filing fees associated with
the referenced  securities  registered under Registration No. 333-58445 totalled
$7,375.
     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities Act of 1933, or until this  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

================================================================================
<PAGE>
THE  INFORMATION IN THIS  PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.  WE MAY
NOT SELL  THESE  SECURITIES  UNTIL THE  REGISTRATION  STATEMENT  FILED  WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE  SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES
IN ANY STATE WHERE AN OFFER OR SALE IS PROHIBITED.

                  SUBJECT TO COMPLETION, DATED JANUARY 7, 2000

Prospectus

                         ARIZONA PUBLIC SERVICE COMPANY
                                  $525,000,000
                              First Mortgage Bonds
                                 Debt Securities

     We may offer and sell first mortgage bonds and debt securities from time to
time in one or more  offerings.  This  prospectus  provides  you with a  general
description of the first mortgage bonds and debt securities we may offer.

     Each time we sell first mortgage bonds or debt securities,  we will provide
a supplement to this prospectus  that contains  specific  information  about the
offering  and the  terms of the first  mortgage  bonds or debt  securities.  The
supplement  may also  add,  update,  or  change  information  contained  in this
prospectus.  You should carefully read this prospectus and any supplement before
you invest in any of our first mortgage bonds or debt securities.

     NEITHER THE  SECURITIES AND EXCHANGE  COMMISSION  NOR ANY STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                                   ----------

           The date of this prospectus is _________________ ___, 2000
<PAGE>
                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

About This Prospectus........................................................  3
Forward-Looking Statements...................................................  3
Where You Can Find More Information..........................................  4
Business of Arizona Public Service Company...................................  5
Ratio of Earnings to Fixed Charges...........................................  5
Use of Proceeds..............................................................  5
Description of First Mortgage Bonds..........................................  5
Description of Debt Securities...............................................  9
Global Securities............................................................ 16
Regarding the Trustees....................................................... 18
Plan of Distribution......................................................... 18
Experts...................................................................... 19
Legal Opinions............................................................... 19

                                       2
<PAGE>
                              ABOUT THIS PROSPECTUS

     This  prospectus is part of a shelf  registration  statement  that we filed
with the United  States  Securities  and  Exchange  Commission,  or the SEC. You
should rely only on the  information  contained or  incorporated by reference in
this prospectus and in any  supplement.  We have not authorized any other person
to provide you with different information. If anyone provides you with different
or  inconsistent  information,  you  should  not rely on it. We will not make an
offer to sell these  securities in any  jurisdiction  where the offer or sale is
not  permitted.  You  should  assume  that  the  information  appearing  in this
prospectus and the supplement to this  prospectus is accurate as of the dates on
their covers.  Our business,  financial  condition,  results of operations,  and
prospects may have changed since those dates.

                           FORWARD-LOOKING STATEMENTS

     This prospectus, any accompanying prospectus supplement, and the additional
information  described  under the heading "Where You Can Find More  Information"
may  contain  forward-looking  statements  within  the  meaning  of the  Private
Securities  Litigation Reform Act of 1995. These statements are subject to risks
and  uncertainties  and  are  based  on  the  beliefs  and  assumptions  of  our
management,  based on information currently available to our management. When we
use words such as  "believes,"  "expects,"  "anticipates,"  "intends,"  "plans,"
"estimates,"  "should," or similar  expressions,  we are making  forward-looking
statements.

     Forward-looking statements are not guarantees of performance.  They involve
risks, uncertainties,  and assumptions. Our future results may differ materially
from those expressed in these  forward-looking  statements.  Many of the factors
that will determine  these results are beyond our ability to control or predict.
These factors include, but are not limited to, the ongoing  restructuring of the
electric  industry;  the  outcome  of  regulatory  proceedings  relating  to the
restructuring;  regulatory,  tax, and environmental legislation;  our ability to
successfully  compete  outside  our  traditional  regulated  markets;   regional
economic  conditions,  which could affect customer growth;  the cost of debt and
equity capital;  weather  variations  affecting  customer  usage;  technological
developments   in  the  electric   industry;   Year  2000   issues;   and  other
uncertainties,  all of which  are  difficult  to  predict  and many of which are
beyond  our  control.  You  are  cautioned  not to  put  undue  reliance  on any
forward-looking statements. For those statements, we claim the protection of the
safe harbor for forward-looking  statements  contained in the Private Securities
Litigation Reform Act of 1995.

                                       3
<PAGE>
                       WHERE YOU CAN FIND MORE INFORMATION

AVAILABLE INFORMATION

     We file annual,  quarterly, and special reports, and other information with
the SEC.  Our SEC filings are  available  to the public over the Internet at the
SEC's web site:  http://www.sec.gov.  You may also read and copy any document we
file at the SEC's public  reference  rooms in  Washington,  D.C.,  New York, New
York, and Chicago,  Illinois. You may call the SEC at 1-800-SEC-0330 for further
information  on the  public  reference  rooms.  Reports  and  other  information
concerning  us can also be  inspected  and copied at the offices of the New York
Stock Exchange at 20 Broad Street, New York, New York 10005. You can also obtain
additional information about us at our web site: http://www.apsc.com.

INCORPORATION BY REFERENCE

     The SEC allows us to incorporate by reference the  information we file with
them, which means that we can disclose important information to you by referring
you to those documents.  The information incorporated by reference is considered
to be part of this prospectus,  and later  information that we file with the SEC
will  automatically  update and supersede  this  information.  We incorporate by
reference the documents listed below and any future filings we make with the SEC
under Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934
until all securities are sold under this prospectus.

     *    Annual  Report on Form 10-K for the  fiscal  year ended  December  31,
          1998;

     *    Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31,
          June 30, and September 30, 1999; and

     *    Current  Reports on Form 8-K dated  January 11,  February  18, May 14,
          August 26, September 21, and November 2, 1999.

You may  request  a copy of  these  filings  and  will  receive  a copy of these
filings, at no cost, by writing or telephoning us at the following address:

                  Arizona Public Service Company
                  Office of the Secretary
                  Station 8102
                  P.O. Box 53999
                  Phoenix, Arizona 85072-3999
                  (602) 379-2608

                                       4
<PAGE>
                   BUSINESS OF ARIZONA PUBLIC SERVICE COMPANY

     We were  incorporated  in 1920  under the laws of Arizona  and are  engaged
principally  in serving  electricity  in the State of Arizona.  We are Arizona's
largest  electric  utility.  We are a  wholly-owned  subsidiary of Pinnacle West
Capital  Corporation.  Our principal  executive offices are located at 400 North
Fifth Street, Phoenix, Arizona 85004, 602-250-1000.

                       RATIO OF EARNINGS TO FIXED CHARGES

     The  following  table sets forth the  historical  ratio of our  earnings to
fixed charges for each of the indicated periods:


Nine Months Ended                       Twelve Months Ended
  September 30,                             December 31,
- -----------------     ----------------------------------------------------------

     1999             1998         1997         1996         1995         1994
     ----             ----         ----         ----         ----         ----
     2.02             3.19         3.07         2.84         2.77         2.96

     For the purposes of these computations,  earnings are defined as the sum of
our  pre-tax  income  plus  our  fixed  charges  and the  fixed  charges  of our
subsidiaries.  Fixed charges  consist of interest on debt,  amortization of debt
discount, premium, and expense, and an estimated interest factor in rentals.

                                 USE OF PROCEEDS

     We will add the net proceeds from any sale of first  mortgage bonds or debt
securities to our general corporate funds. We will use the net proceeds to repay
debt and for general  corporate  purposes.  A prospectus  supplement may include
other uses of the net proceeds.

                       DESCRIPTION OF FIRST MORTGAGE BONDS

GENERAL

     The  following  description  highlights  the  general  terms  of the  first
mortgage bonds. When we offer first mortgage bonds in the future, the prospectus
supplement will explain the particular  terms of those securities and the extent
to which these general provisions will not apply.

     Our mortgaged  property  will secure the first  mortgage  bonds.  The first
mortgage  bonds will be issued under a Mortgage  and Deed of Trust,  dated as of
July 1, 1946,  between us and The Bank of New York.  The  Mortgage  allows us to
issue first mortgage bonds in one or more series.

     We have summarized  selected  provisions of the Mortgage below. The summary
is not  complete.  We have filed the form of the  Mortgage  as an exhibit to the
registration  statement and you should read any  provisions of the Mortgage that
may be important to you.

     You should refer to the prospectus  supplement  attached to this prospectus
for the following information about a new series of first mortgage bonds:

     *    the aggregate principal amount of the first mortgage bonds;

     *    the date on which the first mortgage bonds mature;

     *    the interest rate;

     *    when the interest on the first mortgage bonds accrues and is payable;

     *    whether and when we can redeem the first mortgage  bonds,  and at what
          price;

     *    the record dates for the payment of interest and principal;

                                       5
<PAGE>
     *    whether the first  mortgage bonds will be issued in the form of one or
          more global securities; and

     *    any other terms.

     We will pay interest to the person in whose name the first  mortgage  bonds
are  registered  at the close of business on the record date that  precedes  the
interest payment date. The supplemental  indenture to the Mortgage that contains
the terms of the first mortgage bonds will also contain the record date. We will
issue the first mortgage bonds as fully registered  bonds,  without coupons,  in
$1,000  denominations and multiples  thereof.  The holders of the first mortgage
bonds may transfer them at any time without any service or other charge,  except
for transfer taxes and other governmental  charges, if any. We, the trustee, and
any of our  agents may treat the  registered  holder of a debt  security  as the
absolute owner for the purpose of making payments,  giving notices,  and for all
other purposes.

     Other  than  the  protections  described  in  this  prospectus  and  in the
prospectus supplement, holders of first mortgage bonds would not be protected by
the covenants in the Mortgage from a highly-leveraged transaction.

REDEMPTION

     Unless indicated differently in a prospectus supplement,  we may redeem the
first  mortgage  bonds at their  principal  amount plus accrued  interest to the
redemption date in any of the following ways:

     *    in whole  or in part  using  the  proceeds  when any of our  mortgaged
          property is taken under eminent domain;

     *    in  whole  or in  part  using  the  proceeds  of  the  sale  or  other
          disposition  of  property  that  is  released  from  the  lien  of the
          Mortgage;

     *    in  whole,   together  with  all  other  first   mortgage  bonds  then
          outstanding,  within  twelve  months of a  transaction  involving  the
          transfer of  substantially  all of the property subject to the lien of
          the Mortgage; or

     *    in whole or in part with cash deposited in a replacement fund.

SECURITY

     The  first  mortgage  bonds  will  rank on an equal  basis  with all  first
mortgage  bonds at any time  outstanding  under  the  Mortgage,  except  for any
sinking fund or similar fund that is provided  for in a particular  series.  The
Mortgage creates a first mortgage lien on substantially all the property we own.
However,  the lien  does  not  cover a  combined  cycle  plant  that we lease or
interests in Unit 2 of the Palo Verde Nuclear  Generating Station that we lease,
or any other property specifically excluded from the Mortgage. The Mortgage lien
and the title to some of our  properties  are subject to excepted  encumbrances,
minor leases, defects, irregularities,  and deficiencies, and are subject to the
considerations discussed below regarding the Four Corners Plant and Navajo Plant
locations.  The Mortgage  lien also extends to all property  acquired  after the
effective date of the Mortgage,  other than specifically excluded property,  for
which  proper  filings and  recordings  have been made.  In the case of property
acquired after the effective date of the Mortgage  lien,  however,  the Mortgage
lien is subject to encumbrances  and to liens existing or placed on the property
at the time we acquire it.

     Both the Four  Corners  Plant and the Navajo  Plant are located on property
held under leases from the Navajo Tribe and easements  from the Secretary of the
Interior.  The leases  extend  from their  effective  dates in 1966 and 1969 for
terms of 50 years with  rights of renewal  for up to 25  additional  years.  The
easements are for 50-year terms from the same effective  dates.  Although we own
the rights granted to us by the leases from the Navajo Tribe, we do not make any
representation about the Navajo Tribe's

                                       6
<PAGE>
interest  in the  lands  leased,  but we are not  aware  of any  assertion  of a
contesting claim to the lands. We also do not make any representations about the
enforceability of the leases against the Navajo Tribe.

     The Mortgage requires us to keep our property encumbered in good repair and
working order as an operating system.  However,  we are permitted to permanently
discontinue or reduce the capacity of any property if:

     *    in the  judgment of our Board of  Directors,  it is  desirable  in the
          conduct of our business;

     *    a regulatory authority orders us to do so; or

     *    we are going to sell or dispose of the property.

     If we are not in default under the  Mortgage,  we may obtain a release from
the Mortgage lien of:

     *    unserviceable,  obsolete,  or  unnecessary  property,  but  only if we
          replace the property with property of equal value; or

     *    other property that we have sold or otherwise disposed of, but only if
          we:

     *    deposit  with the  trustee  cash in an  amount  equal to the  released
          property's fair value;

     *    use redeemed or retired first mortgage bonds in an amount equal to the
          released property's fair value; or

     *    use as a credit  additional  property we acquired within the preceding
          five years that has fair value equal to the released  property's  fair
          value.

     The  trustee  may,  and upon our request  must,  cancel and  discharge  the
Mortgage  lien and all  supplemental  indentures  to the  Mortgage  when we have
repaid all of the debt secured by the Mortgage.

ISSUANCE OF ADDITIONAL FIRST MORTGAGE BONDS

     We may issue  additional  first  mortgage  bonds  under the  Mortgage  in a
principal amount equal to:

     *    60% of net property additions;

     *    the  principal  amount of redeemed or retired  first  mortgage  bonds;
          and/or

     *    deposited cash,

but only if our  adjusted  net  earnings  over the  twelve-month  period  within
fifteen months  preceding the month in which we issue the bonds are at least two
times the annual  interest on all  outstanding  first  mortgage  bonds after the
issuance  and on debt  secured  by prior  liens.  There are  exceptions  to this
earnings  coverage  requirement  for first mortgage bonds issued on the basis of
redeemed or retired  first  mortgage  bonds when the  redeemed or retired  first
mortgage  bonds had a higher  rate of  interest  and when other  conditions  are
satisfied.

     We can support the issuance of new first  mortgage  bonds by using property
located on leaseholds or easements,  such as the Four Corners and Navajo Plants,
if the leasehold or easement has an unexpired term of, or the term is extendable
at our option for, at least 30 years  after the date of  issuance,  or if we may
remove the property without compensation.

                                       7
<PAGE>
     As of September 30, 1999, we estimate that the Mortgage  would have allowed
us to issue up to  approximately  $2.34  billion of  additional  first  mortgage
bonds.  In addition to complying  with the Mortgage  restrictions  placed on the
issuance of additional  first mortgage bonds, we must obtain the approval of the
Arizona Corporation  Commission,  which we refer to as the ACC, before incurring
long-term debt.  Existing ACC orders allow us to have approximately $2.6 billion
in principal  amount of long-term  debt  outstanding  at any one time. We do not
expect these orders to limit our ability to meet our capital requirements.

REPLACEMENT FUND

     So long as any of our first  mortgage bonds are  outstanding,  the Mortgage
requires us to deposit  cash with the trustee  each  calendar  year in an amount
related to net additions to our mortgaged utility plant. However, we may satisfy
all or any part of this  requirement by using redeemed or retired first mortgage
bonds, property additions,  or property  retirements.  For 1998, our replacement
fund requirement was about $138 million.  Any cash that we deposit may, upon our
request,  be applied to the redemption or repurchase of first mortgage bonds. We
may withdraw the cash from the trustee by using  additional  property we acquire
or redeemed or retired first mortgage bonds. If we do not withdraw the cash from
the  trustee  within five years of  deposit,  the  trustee  must use the cash to
redeem outstanding first mortgage bonds. The prospectus supplement relating to a
particular  series of first  mortgage  bonds may  describe  restrictions  on our
ability to redeem the first mortgage bonds with cash we deposit with the trustee
to meet our replacement fund requirements.

EVENTS OF DEFAULT

     The following are defaults under the Mortgage:

     *    our failure to pay the  principal of any first  mortgage bond when due
          and payable;

     *    our failure to pay interest on any first  mortgage bond within 60 days
          after it is due and payable;

     *    our failure to pay any  installment of any fund required to be applied
          to the purchase or redemption of first  mortgage  bonds within 60 days
          after it is due and payable;

     *    bankruptcy, insolvency, and reorganization events involving us; and

     *    our  failure to  perform  any other  covenant  of the  Mortgage  which
          continues for 90 days after notice by the trustee or holders of 15% in
          principal amount of eligible bonds.

     The  Mortgage  allows the  trustee to  withhold  notice of  defaults if the
trustee determines in good faith that withholding the notice is in the interests
of the  bondholders.  The trustee may not withhold  notice of any default in the
payment of principal or interest or any sinking,  improvement,  replacement,  or
purchase fund installment.

     Those holding at least a majority in principal amount of the first mortgage
bonds may direct the time,  method,  and place of conducting  any proceeding for
any remedy available to the trustee.  However, the trustee may decline to follow
any direction  under some  circumstances,  including  the  trustee's  good faith
determination that it will not be sufficiently indemnified for any expenditures.
We are  required to file with the  trustee,  on or before July 1 of each year, a
certificate  stating we have complied with all of the provisions of the Mortgage
and that we are not in default and, if we have not  complied,  stating all known
defaults.

MODIFICATION OF THE MORTGAGE

     The Mortgage and the rights of bondholders may be modified if the following
parties consent to the modification:

                                       8
<PAGE>
     *    us;

     *    the trustee, if the trustee is affected by the modification;

     *    holders  of at least 70% in  principal  amount  of the first  mortgage
          bonds, if all series are affected by the modification; or

     *    holders  of at least 70% in  principal  amount of any  series of first
          mortgage  bonds  affected by the  modification,  if all series are not
          affected.

     However,  the holder of each first  mortgage  bond affected must consent to
any modification that would:

     *    affect the rights of the holder to receive  payment of the  principal,
          premium,  or interest on any first  mortgage bonds on the dates due or
          to institute suit to enforce such right;

     *    permit the creation of an  additional  lien ranking  prior or equal to
          the lien of the Mortgage to any of the mortgaged property;

     *    deprive  any  nonassenting  bondholder  of a lien  upon the  mortgaged
          property for the security of the holder's first mortgage bonds; or

     *    reduce  the  percentage  of  bondholders  required  to  consent  to  a
          modification.

RESTRICTIONS ON DIVIDENDS

     The Mortgage  restricts  the payment of dividends on our common stock under
conditions that have not existed in the past and do not currently exist.

                         DESCRIPTION OF DEBT SECURITIES

GENERAL

     The  following  description  highlights  the  general  terms  of  the  debt
securities.  When  we  offer  debt  securities  in the  future,  the  prospectus
supplement will explain the particular  terms of those securities and the extent
to which any of these general provisions will not apply.

     The debt securities will be our unsecured obligations.  The debt securities
may be issued in one or more new series under:

     *    an  Indenture,  dated as of January 1, 1995,  between  The Bank of New
          York and us, in the case of subordinated debt securities; or

     *    an  Indenture,  dated  as of  January  15,  1998,  between  The  Chase
          Manhattan Bank and us, in the case of senior debt securities.

     We have summarized selected provisions of the Indentures below. The summary
is not  complete.  We have filed the forms of the  Indentures as exhibits to the
registration statement and you should read any provisions of the Indentures that
may be important to you. Although separate  Indentures are used for subordinated
debt securities and senior debt securities,  the description of the Indenture in
this section applies to both Indentures, unless otherwise noted.

     You should refer to the prospectus  supplement  attached to this prospectus
for the following information about a new series of debt securities:

                                       9
<PAGE>
     *    title of the debt securities;

     *    the aggregate principal amount of the debt securities or the series of
          which they are a part;

     *    the date on which the debt securities mature;

     *    the interest rate;

     *    when the interest on the debt securities accrues and is payable;

     *    the record dates;

     *    places where principal, premium, or interest will be payable;

     *    periods  within  which,  and  prices  at  which  we  can  redeem  debt
          securities at our option;

     *    any  obligation  on our part to redeem  or  purchase  debt  securities
          pursuant to a sinking fund or at the option of the holder;

     *    denominations and multiples at which debt securities will be issued if
          other than $1,000;

     *    any index or formula from which the amount of principal or any premium
          or interest may be determined;

     *    any allowance for alternative currencies and determination of value;

     *    whether  the debt  securities  are  defeasible  under the terms of the
          Indenture;

     *    whether we are issuing the debt securities as global securities;

     *    any  additional  or different  events of default and any change in the
          right of the trustee or the holders to declare  the  principal  amount
          due and payable if there is any default;

     *    any addition to or change in the covenants in the Indenture; and

     *    any other terms.

     We may sell the debt  securities  at a  substantial  discount  below  their
principal amount. The prospectus  supplement may describe special federal income
tax  considerations  that apply to debt  securities  sold at an  original  issue
discount or to debt  securities  that are  denominated  in a currency other than
United States dollars.

     Other  than  the  protections  described  in  this  prospectus  and  in the
prospectus supplement,  holders of debt securities would not be protected by the
covenants in the Indenture from a highly-leveraged transaction.

SUBORDINATION

     The Indenture  relating to the  subordinated  debt securities  states that,
unless otherwise provided in a supplemental indenture or a board resolution, the
debt securities will be subordinate to all senior debt. This is true whether the
senior  debt is  outstanding  as of the  date of the  Indenture  or is  incurred
afterwards.  The balance of the  information  under this heading  assumes that a
supplemental  indenture  or a  board  resolution  results  in a  series  of debt
securities being subordinated obligations.

                                       10
<PAGE>
     The Indenture states that we cannot make payments of principal, premium, or
interest on the subordinated debt if:

     *    the principal, premium or interest on senior debt is not paid when due
          and the  applicable  grace  period for the  default  has ended and the
          default has not been cured or waived; or

     *    the  maturity  of any senior  debt has been  accelerated  because of a
          default.

     The Indenture  provides that we must pay all senior debt in full before the
holders of the subordinated debt securities may receive or retain any payment if
our assets are distributed to our creditors upon any of the following:

     *    dissolution;

     *    winding-up;

     *    liquidation;

     *    reorganization, whether voluntary or involuntary;

     *    bankruptcy;

     *    insolvency;

     *    receivership; or

     *    any other proceedings.

     The  Indenture  provides that when all amounts owing on the senior debt are
paid in full, the holders of the subordinated debt securities will be subrogated
to the rights of the holders of senior debt to receive payments or distributions
applicable to senior debt.

     The Indenture defines senior debt as the principal,  premium,  interest and
any other payment due under any of the  following,  whether  outstanding  at the
date of the Indenture or thereafter incurred, created or assumed:

     *    all of our  debt  evidenced  by  notes,  debentures,  bonds,  or other
          securities  we sell for  money,  including  all of our first  mortgage
          bonds;

     *    all debt of others  of the kinds  described  in the  preceding  bullet
          point that we assume or guarantee in any manner; and

     *    all renewals, extensions, or refundings of debt of the kinds described
          in either of the two preceding bullet points.

However,  the  preceding  will not be  considered  senior  debt if the  document
creating the debt or the  assumption  or guarantee of the debt states that it is
not  superior  to or that it is on  equal  footing  with the  subordinated  debt
securities.

     The Indenture  does not limit the  aggregate  amount of senior debt that we
may issue. As of September 30, 1999,  outstanding  senior debt was approximately
$1 billion and subordinated debt was  approximately  $75 million.  As of January
31, 2000, we will redeem all of our outstanding subordinated debt.

                                       11
<PAGE>
FORM, EXCHANGE, AND TRANSFER

     Each series of debt  securities  will be issuable only in fully  registered
form  and  without  coupons.  In  addition,  unless  otherwise  specified  in  a
prospectus  supplement,  the debt securities will be issued in  denominations of
$1,000 and multiples of $1,000. We, the trustee, and any of our agents may treat
the  registered  holder of a debt security as the absolute owner for the purpose
of making payments, giving notices, and for all other purposes.

     The  holders  of debt  securities  may  exchange  them for any  other  debt
securities of the same series,  in  authorized  denominations,  like tenor,  and
equal principal  amount.  However,  this type of exchange will be subject to the
terms of the Indenture and any limitations that apply to global securities.

     A holder may transfer debt  securities by presenting the endorsed  security
at the office of a security  registrar or at the office of any transfer agent we
designate.  The holder will not be charged for any exchange or  registration  of
transfer,  but we may  require  payment  to cover any tax or other  governmental
charge in connection with the  transaction.  We have appointed the trustee under
each  Indenture as security  registrar.  A prospectus  supplement  will name any
transfer  agent we  designate  for any debt  securities  if  different  from the
security registrar.  We may designate  additional transfer agents or rescind the
designation  of any  transfer  agent or approve a change in the  office  through
which any  transfer  agent  acts at any time,  except  that we will  maintain  a
transfer agent in each place of payment for debt securities.

     If the debt  securities  of any series  and/or  tenor are to be redeemed in
part, we will not be required to do any of the following:

     *    issue,  register the transfer of, or exchange any debt  securities  of
          that series  and/or tenor  beginning 15 days before the day of mailing
          of a notice of  redemption  of any debt  security that may be selected
          for  redemption  and ending at the close of business on the day of the
          mailing; or

     *    register the transfer of or exchange  any debt  security  selected for
          redemption,  except for an unredeemed  portion of a debt security that
          is being redeemed in part.

PAYMENT AND PAYING AGENTS

     Unless otherwise indicated in the applicable prospectus supplement, we will
pay interest on a debt  security on any  interest  payment date to the person in
whose name the debt security is registered.

     Unless otherwise  indicated in the applicable  prospectus  supplement,  the
principal,  premium,  and interest on the debt securities of a particular series
will be  payable  at the  office of the  paying  agents  that we may  designate.
However,  we may pay any interest by check mailed to the address,  as it appears
in the security register, of the person entitled to that interest.  Also, unless
otherwise indicated in the applicable prospectus supplement, the corporate trust
office of the trustee in The City of New York will be our sole paying  agent for
payments with respect to debt securities of each series.  Any other paying agent
that we initially  designate for the debt securities of a particular series will
be named in the applicable prospectus  supplement.  We may at any time designate
additional  paying  agents or rescind  the  designation  of any paying  agent or
approve a change in the office through which any paying agent acts,  except that
we will maintain a paying agent in each place of payment for the debt securities
of a particular series.

     All money that we pay to a paying  agent for the payment of the  principal,
premium, or interest on any debt securities that remains unclaimed at the end of
two years after the principal,  premium,  or interest has become due and payable
will be repaid to us,  and the holder of the debt  security  may look only to us
for payment.

                                       12
<PAGE>
CONSOLIDATION, MERGER, AND SALE OF ASSETS

     Unless otherwise indicated in the applicable prospectus supplement,  we may
not:

     *    consolidate with or merge into any other entity;

     *    convey,  transfer, or lease our properties and assets substantially as
          an entirety to any entity; or

     *    permit  any  entity to  consolidate  with or merge  into us or convey,
          transfer,  or lease its  properties  and  assets  substantially  as an
          entirety to us,

          unless the following conditions are met:

          *    the successor  entity is a corporation,  partnership,  trust,  or
               other entity organized and validly existing under the laws of any
               domestic  jurisdiction  and assumes our  obligations  on the debt
               securities and under the Indenture;

          *    immediately  after giving effect to the transaction,  no event of
               default,  and no event  which,  after  notice or lapse of time or
               both,  would become an event of default,  shall have occurred and
               be continuing; and

          *    other conditions are met.

Upon  any  merger,  consolidation,  or  transfer  or lease  of  properties,  the
successor  person  will  be  substituted  for  us  under  the  Indenture,   and,
thereafter,  except  in  the  case  of a  lease,  we  will  be  relieved  of all
obligations and covenants under the Indenture and the debt securities.

EVENTS OF DEFAULT

     Each of the following will be an event of default under the Indenture
with respect to debt securities of any series:

     *    our failure to pay principal of or any premium on any debt security of
          that series when due;

     *    our failure to pay any interest on any debt  securities of that series
          when due, and the continuance of that failure for 30 days;

     *    our failure to deposit any sinking fund payment,  when due, in respect
          of any debt securities of that series;

     *    our failure to perform  any of our other  covenants  in the  Indenture
          relating to that  series and the  continuance  of that  failure for 90
          days after written notice has been given by the trustee or the holders
          of at least 25% in principal amount of the outstanding debt securities
          of that series;

     *    bankruptcy, insolvency, or reorganization events involving us; and

     *    any other event of default for that series described in the applicable
          prospectus supplement.

     If an event of  default  occurs  and is  continuing  other than an event of
default  relating  to  bankruptcy,  insolvency,  or  reorganization,  either the
trustee or the  holders  of at least 25% in  aggregate  principal  amount of the
outstanding  debt  securities  of the affected  series may declare the principal
amount of the debt securities of that series to be due and payable  immediately.
In the case of any debt

                                       13
<PAGE>
security that is an original issue discount  security or the principal amount of
which is not then  determinable,  the  trustee or the holders of at least 25% in
aggregate principal amount of the outstanding debt securities of that series may
declare the portion of the principal  amount of the debt  security  specified in
the terms of such debt security to be immediately  due and payable upon an event
of default.

     If an event of default involving bankruptcy,  insolvency, or reorganization
occurs,  the principal  amount of all the debt securities of the affected series
will automatically,  and without any action by the trustee or any holder, become
immediately due and payable.  After any  acceleration,  but before a judgment or
decree based on acceleration,  the holders of a majority in aggregate  principal
amount of the  outstanding  debt securities of that series may rescind and annul
the  acceleration  if all  events of  default,  other  than the  non-payment  of
accelerated principal, have been cured or waived as provided in the Indenture.

     The trustee  will be under no  obligation  to exercise any of its rights or
powers  under the  Indenture  at the request or direction of any of the holders,
unless the holders have  offered the trustee  reasonable  indemnity.  Subject to
provisions for the indemnification of the trustee,  the holders of a majority in
principal  amount of the outstanding debt securities of any series will have the
right to direct the time, method, and place of conducting any proceeding for any
remedy  available to the trustee,  or exercising any trust or power conferred on
the trustee, with respect to the debt securities of that series.

     No holder of a debt security of any series will have any right to institute
any proceeding  under the Indenture,  or for the  appointment of a receiver or a
trustee, or for any other remedy under the Indenture, unless:

     *    the  holder  has  previously  given the  trustee  written  notice of a
          continuing  event of default  with respect to the debt  securities  of
          that series;

     *    the  holders  of at least  25% in  aggregate  principal  amount of the
          outstanding  debt securities of that series have made written request,
          and the holder or holders have offered  reasonable  indemnity,  to the
          trustee to institute the proceeding as trustee; and

     *    the  trustee  has  failed to  institute  the  proceeding,  and has not
          received from the holders of a majority in aggregate  principal amount
          of  the  outstanding  debt  securities  of  that  series  a  direction
          inconsistent  with  the  request  within  60 days  after  the  notice,
          request, and offer.

The limitations  provided above do not apply to a suit instituted by a holder of
a debt security for the  enforcement  of payment of the principal,  premium,  or
interest on the debt security on or after the applicable due date.

     We are required to furnish to the trustee annually a certificate of various
officers  stating  whether  or  not  we are in  default  in the  performance  or
observance of any of the terms, provisions, and conditions of the Indenture and,
if so, specifying all known defaults.

MODIFICATION AND WAIVER

     In limited  cases the trustee,  as well as us, may make  modifications  and
amendments to the Indenture  without the consent of the holders of any series of
debt  securities.  The  trustee may make  modifications  and  amendments  to the
Indenture  with the consent of the holders of not less than 66-2/3% in aggregate
principal  amount of the outstanding  debt securities of each series affected by
the  modification  or amendment.  However,  without the consent of the holder of
each outstanding debt security affected, no modification or amendment may:

     *    change the stated  maturity of the principal of, or any installment of
          principal of or interest on, any debt security;

                                       14
<PAGE>
     *    reduce the  principal  amount of, or any premium or  interest  on, any
          debt security;

     *    reduce the amount of principal of an original issue discount  security
          or any other debt security  payable upon  acceleration of the maturity
          of the security;

     *    change  the place or  currency  of  payment  of  principal  of, or any
          premium or interest on, any debt security;

     *    impair the right to institute suit for the  enforcement of any payment
          on or with respect to any debt security; or

     *    reduce  the  percentage  in  principal   amount  of  outstanding  debt
          securities of any series, the consent of whose holders is required for
          modification  or amendment of the  Indenture  necessary  for waiver of
          compliance  with  certain  provisions  of the  Indenture or of certain
          defaults,  or modify  the  provisions  of the  Indenture  relating  to
          modification and waiver.

     Compliance  with certain  restrictive  provisions  of the  Indenture may be
waived by the holders of not less than 66-2/3% in aggregate  principal amount of
the  outstanding  debt  securities  of any series.  The holders of a majority in
principal  amount of the outstanding debt securities of any series may waive any
past default under the Indenture, except:

     *    a default in the payment of principal, premium, or interest; and

     *    a default under covenants and provisions of the Indenture which cannot
          be amended without the consent of the holder of each  outstanding debt
          security of the affected series.

     In determining whether the holders of the requisite principal amount of the
outstanding debt securities have given or taken any direction,  notice, consent,
waiver, or other action under the Indenture as of any date:

     *    the  principal  amount  of  an  outstanding  original  issue  discount
          security  will be the  amount of the  principal  that would be due and
          payable upon acceleration of the maturity on that date,

     *    if the  principal  amount  payable  at the stated  maturity  of a debt
          security is not determinable,  the principal amount of the outstanding
          debt  security will be an amount  determined in the manner  prescribed
          for the debt security; and

     *    the principal  amount of an outstanding  debt security  denominated in
          one or more foreign  currencies will be the U.S. dollar  equivalent of
          the  principal  amount of the debt  security or, in the case of a debt
          security  described in the previous clause above, the amount described
          in that clause.

     If debt  securities  have been fully defeased or if we have deposited money
with the  trustee  to  redeem  debt  securities,  they  will  not be  considered
outstanding.

     Except in limited  circumstances,  we will be  entitled to set any day as a
record  date for the purpose of  determining  the  holders of  outstanding  debt
securities  of any  series  entitled  to  give or take  any  direction,  notice,
consent,  waiver, or other action under the Indenture. In limited circumstances,
the trustee  will be  entitled to set a record date for action by holders.  If a
record date is set for any action to be taken by holders of a particular series,
the  action may be taken only by persons  who are  holders of  outstanding  debt
securities of that series on the record date.  To be effective,  the action must
be taken by holders of the  requisite  principal  amount of the debt  securities
within a specified period  following the record date. For any particular  record
date,  this  period  will be 180  days or any  other  shorter  period  as we may
specify. The period may be shortened or lengthened, but not beyond 180 days.

                                       15
<PAGE>
DEFEASANCE AND COVENANT DEFEASANCE

     We may elect to have the provisions of the Indenture relating to defeasance
and discharge of  indebtedness,  or defeasance of  restrictive  covenants in the
Indenture,  applied to the debt  securities  of any series,  or to any specified
part  of a  series.  The  prospectus  supplement  describing  a  series  of debt
securities will state whether we can make these elections for that series.

     DEFEASANCE AND DISCHARGE

     We will be discharged from all of our obligations  with respect to the debt
securities  of a series  if we  deposit  with  the  trustee  money in an  amount
sufficient to pay the principal, premium, and interest on the debt securities of
that series when due in accordance  with the terms of the Indenture and the debt
securities.  We can also  deposit  securities  that will  provide the  necessary
monies.  However,  we will not be discharged from the obligations to exchange or
register the transfer of debt securities,  to replace stolen, lost, or mutilated
debt securities,  to maintain paying agencies, and to hold moneys for payment in
trust.  The  defeasance or discharge may occur only if we deliver to the trustee
an opinion of counsel  stating  that we have  received  from,  or there has been
published by, the United States Internal Revenue Service a ruling,  or there has
been a change in tax law, in either case to the effect that holders of such debt
securities:

     *    will not recognize  gain or loss for federal  income tax purposes as a
          result of the deposit, defeasance, and discharge; and

     *    will be subject to federal income tax on the same amount,  in the same
          manner,  and at the  same  times as  would  have  been the case if the
          deposit, defeasance, and discharge were not to occur.

     DEFEASANCE OF COVENANTS

     We may elect to omit compliance with restrictive covenants in the Indenture
and any additional covenants that may be described in the applicable  prospectus
supplement  for a series of debt  securities.  This  election will preclude some
actions from being  considered  defaults  under the Indenture for the applicable
series.  In order to exercise  this option,  we will be required to deposit,  in
trust for the  benefit  of the  holders of debt  securities,  funds in an amount
sufficient to pay the principal,  premium and interest on the debt securities of
the  applicable  series.  We may also deposit  securities  that will provide the
necessary  monies. We will also be required to deliver to the trustee an opinion
of counsel to the effect that holders of the debt  securities will not recognize
gain or loss for federal  income tax  purposes  as a result of such  deposit and
defeasance of certain  obligations  and will be subject to federal income tax on
the same amount, in the same manner and at the same times as would have been the
case if the deposit and defeasance were not to occur. If we exercise this option
with respect to any debt securities and the debt securities are declared due and
payable  because of the occurrence of any event of default,  the amount of funds
deposited in trust would be sufficient to pay amounts due on the debt securities
at the time of their respective  stated  maturities but may not be sufficient to
pay amounts due on the debt  securities on any  acceleration  resulting  from an
event of  default.  In that case,  we would  remain  liable  for the  additional
payments.

GOVERNING LAW

     The law of the State of New York will  govern  the  Indenture  and the debt
securities .

                                GLOBAL SECURITIES

     Some or all of the first  mortgage  bonds or debt  securities of any series
may be represented, in whole or in part, by one or more global securities, which
will have an  aggregate  principal  amount  equal to that of the first  mortgage
bonds or debt securities  they represent.  We will register each global security
in

                                       16
<PAGE>
the name of a depositary or nominee  identified in a prospectus  supplement  and
deposit the global security with the depositary or nominee. Each global security
will bear a legend  regarding the  restrictions on exchanges and registration of
transfer  referred  to below  and  other  matters  specified  in a  supplemental
indenture to the Mortgage or the Indenture.

     No  global  security  may be  exchanged  for first  mortgage  bonds or debt
securities  registered,  and no transfer of a global security may be registered,
in the name of any person other than the depositary  for the global  security or
any nominee of the depositary, unless:

     *    the  depositary  has  notified  us that it is  unwilling  or unable to
          continue  as  depositary  for the global  security or has ceased to be
          qualified to act as depositary;

     *    a default has  occurred  and is  continuing  with respect to the first
          mortgage bonds or debt securities  represented by the global security;
          or

     *    any other  circumstances exist that may be described in the applicable
          supplemental indenture and prospectus supplement.

     We will register all securities issued in exchange for a global security or
any portion of a global security in the names specified by the depositary.

     As long as the  depositary  or its  nominee is the  registered  holder of a
global security, the depositary or nominee will be considered the sole owner and
holder of the global  security and the first mortgage  bonds or debt  securities
that it  represents.  Except in the  limited  circumstances  referred  to above,
owners of beneficial interests in a global security will not:

     *    be entitled to have the global  security  or first  mortgage  bonds or
          debt securities registered in their names;

     *    receive or be entitled to receive  physical  delivery of  certificated
          first  mortgage  bonds or debt  securities  in  exchange  for a global
          security; and

     *    be  considered  to be the owners or holders of the global  security or
          any first mortgage bonds or debt  securities for any purpose under the
          Mortgage or the Indenture.

     We will make all payments of principal,  premium,  and interest on a global
security  to the  depositary  or its  nominee.  The  laws of some  jurisdictions
require that  purchasers of securities  take physical  delivery of securities in
definitive form. These laws make it difficult to transfer  beneficial  interests
in a global security.

     Ownership of beneficial  interests in a global  security will be limited to
institutions that have accounts with the depositary or its nominee,  referred to
as  Participants,  and to persons  that may hold  beneficial  interests  through
Participants.  In  connection  with the  issuance  of any global  security,  the
depositary will credit, on its book-entry  registration and transfer system, the
respective  principal  amounts  of  first  mortgage  bonds  or  debt  securities
represented  by the  global  security  to  the  accounts  of  its  Participants.
Ownership of  beneficial  interests in a global  security  will only be shown on
records maintained by the depositary or the Participant.  Likewise, the transfer
of ownership interests will be effected only through the same records. Payments,
transfers,  exchanges,  and other matters relating to beneficial  interests in a
global security may be subject to various policies and procedures adopted by the
depositary  from time to time.  Neither we, the  trustee,  nor any of our agents
will have  responsibility or liability for any aspect of the depositary's or any
Participant's  records  relating  to,  or  for  payments  made  on  account  of,
beneficial interests in a global security, or for maintaining,  supervising,  or
reviewing any records relating to the beneficial interests.

                                       17
<PAGE>
                             REGARDING THE TRUSTEES

     The Bank of New York is the trustee  under the Mortgage  and trustee  under
the Indenture  relating to the subordinated debt securities.  We maintain normal
banking arrangements with The Bank of New York, which include:

     *    a commitment in the aggregate  principal amount of approximately $15.8
          million by The Bank of New York pursuant to a reimbursement  agreement
          related to a letter of credit issued on our behalf in connection  with
          an issuance of  pollution  control  bonds,  the proceeds of which were
          made available to us; and

     *    a $26.6  million  commitment  by The  Bank of New York  pursuant  to a
          revolving credit  agreement,  approximately  $6.3 million of which was
          outstanding at September 30, 1999.

     The Bank of New York also serves as:

     *    trustee for the holders of several  issues of pollution  control bonds
          issued on our behalf;

     *    trustee under our senior note indenture;

     *    investment manager for our nonunion post-retirement medical fund; and

     *    custodian of international fixed-income assets for our pension plan.

     An affiliate of The Bank of New York is the remarketing  agent for a series
of our pollution control bonds.

     The Chase Manhattan Bank is the trustee under the Indenture relating to the
senior debt securities.  We maintain normal banking  arrangements with The Chase
Manhattan Bank. The Chase Manhattan Bank also:

     *    serves as trustee for the holders of several series of bonds issued by
          a party  unaffiliated  with us,  secured by, among other  things,  our
          payments under our Palo Verde Nuclear Generating Station leases;

     *    serves as an issuing and paying agent with  respect to our  commercial
          paper program; and

     *    has a  commitment  to lend us up to $49.4  million  under a  revolving
          credit agreement, approximately $13.8 million of which was outstanding
          as of September 30, 1999.

     In  addition,  an  affiliate  of The  Chase  Manhattan  Bank  is the  owner
participant  under a trust to which we sold and leased  back a portion of Unit 2
of the Palo Verde Nuclear Generating Station.

                              PLAN OF DISTRIBUTION

     We intend to sell up to $525,000,000 in aggregate  principal  amount of the
offered securities to or through  underwriters or dealers, and may also sell the
offered securities  directly to other purchasers or through agents, as described
in the  prospectus  supplement  relating to an issue of first  mortgage bonds or
debt securities.

     We may distribute the offered  securities  from time to time in one or more
transactions  at a fixed  price or prices,  which may be  changed,  or at market
prices  prevailing at the time of sale, at prices  related to prevailing  market
prices, or at negotiated prices.

                                       18
<PAGE>
     In connection  with the sale of the offered  securities,  underwriters  may
receive  compensation from us or from purchasers of offered  securities for whom
they  act as  agents  in the form of  discounts,  concessions,  or  commissions.
Underwriters may sell offered securities to or through dealers,  and the dealers
may receive compensation in the form of discounts,  concessions,  or commissions
from the underwriters  and/or  commissions from the purchasers for whom they act
as  agents.   Underwriters,   dealers,   and  agents,  who  participate  in  the
distribution of offered  securities,  may be considered to be underwriters,  and
any  discounts  or  commissions  received  by them from us and any profit on the
resale  of  offered  securities  by them may be  considered  to be  underwriting
discounts and commissions under the Securities Act of 1933. We will identify any
person  considered to be an underwriter,  and we will describe any  compensation
received from us in the prospectus supplement.

     We may agree to indemnify underwriters, dealers, and agents who participate
in the distribution of the offered  securities  against  liabilities,  including
liabilities under the Securities Act of 1933.

                                     EXPERTS

     The financial statements  incorporated in this prospectus by reference from
APS' 1998 Annual Report on Form 10-K have been audited by Deloitte & Touche LLP,
independent  auditors as stated in their report, which is incorporated herein by
reference,  and have been so  incorporated  in reliance  upon the report of such
firm given upon their authority as experts in accounting and auditing.

                                 LEGAL OPINIONS

     Snell & Wilmer  L.L.P.,  One Arizona  Center,  Phoenix,  Arizona 85004 will
opine on the validity of the offered  securities.  We currently  anticipate that
Sullivan and Cromwell,  1888 Century Park East,  Los Angeles,  California  90067
will opine on the validity of the offered  securities  for any  underwriters  of
securities.  In giving  their  opinions,  Sullivan & Cromwell and Snell & Wilmer
L.L.P.  may rely as to matters  of New Mexico law upon the  opinion of Keleher &
McLeod,  P.A.,  Albuquerque  Plaza, 201 Third NW, 12th Floor,  Albuquerque,  New
Mexico 87102.  Snell & Wilmer L.L.P.  may rely as to all matters of New York law
upon the opinion of Sullivan & Cromwell.  Sullivan & Cromwell may rely as to all
matters of Arizona law upon the opinion of Snell & Wilmer L.L.P.

                                       19
<PAGE>





                                  $525,000,000

                         ARIZONA PUBLIC SERVICE COMPANY


                              FIRST MORTGAGE BONDS
                                 DEBT SECURITIES


                                   ----------

                                       APS

                                   ----------





<PAGE>
                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

Securities and Exchange Commission registration fee ........           $132,000

Printing, engraving, and postage expenses ..................             40,000*

Legal fees .................................................            300,000*

Accounting fees ............................................             30,000*

Rating Agency fees .........................................            260,000*

Trustee's fees and expenses ................................             25,000*

Blue Sky fees and expenses .................................             30,000*

Miscellaneous ..............................................              8,000*
                                                                       --------
         Total .............................................           $825,000*
                                                                       ========
- ----------
* Estimated.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     The law of Arizona permits extensive  indemnification of present and former
directors,  officers, employees or agents of an Arizona corporation,  whether or
not  authority  for  such  indemnification  is  contained  in  the  indemnifying
corporation's  articles  of  incorporation  or bylaws.  Specific  authority  for
indemnification  of present and former  directors  and  officers,  under certain
circumstances,  is  contained  in Article  Fifth of the  Company's  Articles  of
Incorporation.  In addition,  Section 7.01 of the Company's bylaws provides that
the Company  will  indemnify  present and former  directors  and officers to the
fullest extent permitted by Arizona law.

     Under the Arizona  Business  Corporation  Act (the "ABCA"),  in order for a
corporation to indemnify a director or officer,  a majority of the corporation's
disinterested  directors,  independent  legal counsel,  or the shareholders must
find that the conduct of the individual to be indemnified  was in good faith and
that  the   individual   reasonably   believed  that  the  conduct  was  in  the
corporation's  best interests (in the case of conduct in an "official  capacity"
with the  corporation)  or that the  conduct  was at least  not  opposed  to the
corporation's  best interests (in all other cases).  In the case of any criminal
proceeding,  the  finding  must be to the  effect  that  the  individual  had no
reasonable  cause to  believe  the  conduct  was  unlawful.  Indemnification  is
permitted  with  respect to  expenses,  judgments,  fines,  and amounts  paid in
settlement by such individuals.

     Indemnification  under  the ABCA is  permissive,  except  in the event of a
successful  defense,  in which case a director  or officer  must be  indemnified
against reasonable  expenses,  including attorneys' fees, incurred in connection
with the  proceeding.  In addition,  the ABCA requires  Arizona  corporations to
indemnify any "outside director" (a director who is not an officer, employee, or
holder of five percent or more of any class of the corporation's  stock) against
liability  unless (i) the  corporation's  articles of  incorporation  limit such
indemnification, (ii) the outside director is adjudged liable in a proceeding by
or in the right of the corporation or in any other proceeding  charging improper
personal benefit to the director, or (iii) a court determines, before payment to
the outside director,  that the director failed to meet the standards of conduct
described in the preceding paragraph.  A court may also order that an individual
be  indemnified  if the court finds that the individual is fairly and reasonably
entitled  to  indemnification  in  light of all of the  relevant  circumstances,
whether or not the  individual  has met the standards of conduct in this and the
preceding paragraph.

     In connection  with the offering made by the prospectus  which is a part of
this  registration  statement,  as  it  may  be  amended  or  supplemented,  the
underwriters of the securities, pursuant to the relevant underwriting agreement,
will  severally  agree to indemnify and hold  harmless the Company,  each of its
directors, each of its officers who have signed this registration statement, and
each  person,  if any,  who  controls  the  Company  within  the  meaning of the
Securities Act of 1933, as amended (the "Act"),

                                      II-1
<PAGE>
against certain losses, claims,  damages, or liabilities,  including liabilities
under the Act, that arise out of or are based upon written information furnished
by such underwriters to the Company for use in this registration statement or in
such prospectus.

     Insurance  is  maintained  on a  regular  basis  (and not  specifically  in
connection  with  this  offering)  against  liabilities  arising  on the part of
directors and officers out of their performance in such capacities or arising on
the part of the Company out of its foregoing indemnification provisions, subject
to certain exclusions and to the policy limits.

ITEM 16. LIST OF EXHIBITS.

EXHIBIT NO.                        DESCRIPTION
- -----------                        -----------

    1.1       Form of Underwriting Agreement for First Mortgage Bonds.
    1.2       Form of Underwriting Agreement for Debt Securities.
    4.1       Form(s) of Supplemental Indenture relating to First Mortgage Bonds
              (to be filed as Exhibit(s) by means of Form 8-K).
    4.2       Specimen(s) of First Mortgage Bonds (to be filed as Exhibit(s) by
              means of Form 8-K).
    4.3       Form(s) of Supplemental Indenture relating to Debt Securities (to
              be filed as Exhibit(s) by means of Form 8-K).
    4.4       Specimen(s) of Debt Securities (to be filed as Exhibit(s) by means
              of Form 8-K).
    5.1       Opinion of Snell & Wilmer L.L.P.
    12.1      Computation of Ratio of Earnings to Fixed Charges.
    23.1      Consent of Deloitte & Touche LLP.
    23.2      Consent of Snell & Wilmer L.L.P. (included in Opinion filed as
              Exhibit No. 5.1).
    24.1      Power of Attorney (see II-6).
    25.1      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Bank of New York, as Bond Trustee under the Mortgage.
    25.2      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Bank of New York, as Trustee under the Indenture
              relating to the subordinated Debt Securities.
    25.3      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Chase Manhattan Bank, as Trustee under the Indenture
              relating to the senior Debt Securities.

     In addition to those Exhibits shown above, the Company hereby  incorporates
the following  Exhibits  pursuant to Rule 411 of Regulation C promulgated  under
the Securities Act of 1933 by reference to the filings set forth below:

<TABLE>
<CAPTION>
Exhibit                                                Previously Filed                          Date
  No.                  Description                       as Exhibit:                File No.   Effective
  ---                  -----------                       -----------                --------   ---------
<S>                                              <C>                                 <C>        <C>
  4.5     Mortgage and Deed of Trust             4.1 to September 1992 Form          1-4473     11-9-92
              relating to Company's First            10-Q Report
              Mortgage Bonds, together with
              forty-eight indentures
              supplemental thereto.

          Forty-ninth Supplemental Indenture     4.1 to 1992 Form 10-K Report        1-4473     3-30-93

          Fiftieth Supplemental Indenture        4.2 to 1993 Form 10-K Report        1-4473     3-30-94

          Fifty-first Supplemental               4.1 to August 1, 1993 Form 8-K      1-4473     9-27-93
              Indenture                              Report
</TABLE>

                                      II-2
<PAGE>
<TABLE>
<CAPTION>
Exhibit                                                Previously Filed                          Date
  No.                  Description                       as Exhibit:                File No.   Effective
  ---                  -----------                       -----------                --------   ---------
<S>                                              <C>                                 <C>        <C>
          Fifty-second Supplemental              4.1 to September 30, 1993 Form      1-4473    11-15-93
              Indenture                              10-Q Report

          Fifty-third Supplemental               4.5 to Registration Statement No.   1-4473     3-1-94
              Indenture                              33-61228 by means of Febru-
                                                     ary 23, 1994 Form 8-K Report

          Fifty-fourth Supplemental              4.1 to Registration Statements      1-4473    11-22-96
              Indenture                              Nos. 33-61228, 33-55473,
                                                     33-64455 and 333-15379 by
                                                     means of November 19, 1996
                                                     Form 8-K Report

          Fifty-fifth Supplemental               4.8 to Registration Statements      1-4473     4-9-97
              Indenture                              Nos. 33-55473, 33-64455 and
                                                     333-15379 by means of April
                                                     7, 1997 Form 8-K Report

  4.6     Agreement of Resignation,              4.1 to September 29, 1995 Form      1-4473    10-24-95
              Appointment, Acceptance,               8-K Report
              and Assignment dated as of
              August 18, 1995 among the
              Company, Bank of America
              National Trust and Savings
              Association and The Bank of
              New York

  4.7     Indenture dated as of January 1,       4.6 to January 1, 1995 Form 8-K     1-4473     1-11-95
              1995 among the Company and             Report
              The Bank of New York, as
              Trustee, relating to subordi-
              nated Debt Securities

  4.8     First Supplemental Indenture           4.4 to January 1, 1995 Form 8-K     1-4473     1-11-95
              dated as of January 1, 1995,           Report
              relating to the issuance of
              $75,000,000 of 10% Junior
              Subordinated Deferrable
              Interest Debentures, Series A,
              Due 2025

  4.9     Indenture dated as of January          4.10 to Registration Statement      1-4473     1-16-98
              15, 1998 among the Company             Nos. 333-15379 and 333-
              and The Chase Manhattan                27551 by means of January
              Bank, as Trustee, relating to          13, 1998 Form 8-K Report
              Senior Debt Securities

 4.10     First Supplemental Indenture           4.3 to Registration Statement       1-4473     1-16-98
              dated as of January 15, 1998,          Nos. 333-15479 and 333-
              relating to the issuance of            27551 by means of January
              $100,000,000 of 6-1/4% Notes           13, 1998 Form 8-K Report
              Due 2005
</TABLE>

                                      II-3
<PAGE>
<TABLE>
<CAPTION>
Exhibit                                                Previously Filed                          Date
  No.                  Description                       as Exhibit:                File No.   Effective
  ---                  -----------                       -----------                --------   ---------
<S>                                              <C>                                 <C>        <C>
 4.11     Second Supplemental                    4.3 to Registration Statement       1-4473     2-22-99
              Indenture dated as of                  Nos. 333-27551 and 333-
              February 15, 1999                      58445 by means of February
                                                     18, 1999 Form 8-K Report

 4.12     Third Supplemental Indenture           4.5 to Registration Statement       1-4473     11-5-99
              dated as of November 1, 1999           No. 333-58445 by means of
              November 2, 1999 Form 8-K
              Report
</TABLE>

ITEM 17. UNDERTAKINGS.

The undersigned registrant hereby undertakes:

     (1) To file,  during any period in which  offers or sales are being made, a
post-effective amendment to this registration statement:

          (i) to include  any  prospectus  required  by Section  10(a)(3) of the
Securities Act of 1933;

          (ii) to reflect in the  prospectus  any facts or events  arising after
the  effective  date  of  the   registration   statement  (or  the  most  recent
post-effective  amendment  thereof)  which,  individually  or in the  aggregate,
represent a fundamental  change in the information set forth in the registration
statement; notwithstanding the foregoing, any increase or decrease in the volume
of securities offered (if the total dollar value of securities offered would not
exceed that which was  registered) and any deviation from the low or high end of
the estimated  maximum offering range may be reflected in the form of prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20 percent  change in the
maximum  aggregate  offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement; and

          (iii) to include any material  information with respect to the plan of
distribution  not  previously  disclosed  in the  registration  statement or any
material  change to such  information in the  registration  statement;  provided
however,  that  paragraphs  (1)(i) and  (1)(ii) do not apply if the  information
required to be included in a  post-effective  amendment by those  paragraphs  is
contained in periodic reports filed by the registrant  pursuant to Section 13 or
Section 15(d) of the Securities  Exchange Act of 1934 that are  incorporated  by
reference in the registration statement.

     (2) That, for the purpose of determining  any liability under the Act, each
such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (3) To remove from registration by means of a post-effective  amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     (4) That,  for purposes of  determining  any liability  under the Act, each
filing of the  registrant's  annual report  pursuant to Section 13(a) or Section
15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee  benefit  plan's annual  report  pursuant to Section 15(d) of the
Securities  Exchange  Act of 1934)  that is  incorporated  by  reference  in the
registration  statement  shall  be  deemed  to be a new  registration  statement
relating to the securities  offered herein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (5) That,  insofar as  indemnification  for  liabilities  arising under the
Securities Act of 1933 may be permitted to directors,  officers, and controlling
persons of the registrant  pursuant to the provisions  referred to in Item 15 of
this Registration Statement, or otherwise, the Company has been advised that, in
the opinion of the Securities and Exchange  Commission,  such indemnification is
against public policy as expressed in the Act and is, therefore,  unenforceable.
In the event that a claim for  indemnification  against

                                      II-4
<PAGE>
such liabilities  (other than the payment by the registrant of expenses incurred
or paid by a director,  officer,  or controlling person of the registrant in the
successful  defense of any  action,  suit,  or  proceeding)  is asserted by such
director, officer, or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction  the  question  of whether  such  indemnification  by it is against
public  policy  as  expressed  in the Act  and  will be  governed  by the  final
adjudication of such issue.

     (6) That,  for purposes of determining  any liability  under the Securities
Act of 1933, the information  omitted from the form of prospectus  filed as part
of this  registration  statement in reliance  upon Rule 430A and  contained in a
form of prospectus filed by the registrant  pursuant to rule 424(b)(1) or (4) or
497(h) under the Securities Act shall be deemed to be part of this  registration
statement as of the time it was declared effective.

     (7) That, for the purpose of determining any liability under the Securities
Act of 1933,  each  post-effective  amendment that contains a form of prospectus
shall be deemed to be a new  registration  statement  relating to the securities
offered  therein,  and the  offering  of such  securities  at that time shall be
deemed to be the initial bona fide offering thereof.

                                      II-5
<PAGE>
                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Phoenix, State of Arizona on the 7th day of January,
2000

                                     ARIZONA PUBLIC SERVICE COMPANY


                                     By  William J. Post
                                         ---------------------------------------
                                      (William J. Post, Chief Executive Officer)

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
registration  statement  has been signed below by the  following  persons in the
capacities and on the dates indicated. Each person whose signature appears below
hereby  authorizes  Chris N. Froggatt,  Barbara M. Gomez, and Michael V. Palmeri
and each of them, as  attorneys-in-fact,  to sign in his or her name and behalf,
individually and in each capacity  designated below, and to file any amendments,
including  post-effective  amendments,  to this registration statement,  and any
related Rule 464(b) registration statement or amendment thereto.

      Signature                       Title                          Date
      ---------                       -----                          ----

William J. Post                Principal Executive Officer       January 7, 2000
- --------------------------     and Director
(William J. Post,
Chief Executive Officer)

Michael V. Palmeri             Principal Accounting and          January 7, 2000
- --------------------------     Financial Officer
(Michael V. Palmeri,
Vice President, Finance)

Jack E. Davis                  Director                          January 7, 2000
- --------------------------
(Jack E. Davis, President,
Energy Delivery and Sales)

Michael L. Gallagher           Director                          January 7, 2000
- --------------------------
(Michael L. Gallagher)

Martha O. Hesse                Director                          January 7, 2000
- --------------------------
(Martha O. Hesse)

Marianne M. Jennings           Director                          January 7, 2000
- --------------------------
(Marianne M. Jennings)

Robert E. Keever               Director                          January 7, 2000
- --------------------------
(Robert E. Keever)

Robert G. Matlock              Director                          January 7, 2000
- --------------------------
(Robert G. Matlock)

Kathryn L. Munro               Director                          January 7, 2000
- --------------------------
(Kathryn L. Munro)

Bruce J. Nordstrom             Director                          January 7, 2000
- --------------------------
(Bruce J. Nordstrom)

                                      II-6
<PAGE>
      Signature                       Title                          Date
      ---------                       -----                          ----


                               Director
- --------------------------
(Donald M. Riley)

Quentin P. Smith, Jr.          Director                          January 7, 2000
- --------------------------
(Quentin P. Smith, Jr.)

Richard Snell                  Director                          January 7, 2000
- --------------------------
(Richard Snell)

William L. Stewart             Director                          January 7, 2000
- --------------------------
(William L. Stewart,
President, Generation)

Diane C. Walker                Director                          January 7, 2000
- --------------------------
(Dianne C. Walker)

Ben F. Williams, Jr.           Director                          January 7, 2000
- --------------------------
(Ben F. Williams, Jr.)

                                      II-7
<PAGE>
                                                      REGISTRATION NO. 333-
================================================================================






                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                   ----------


                                   EXHIBITS TO

                                    FORM S-3

                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933


                                   ----------


                         ARIZONA PUBLIC SERVICE COMPANY
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)









================================================================================
<PAGE>
                                 EXHIBIT INDEX


EXHIBIT NO.                        DESCRIPTION
- -----------                        -----------

    1.1       Form of Underwriting Agreement for First Mortgage Bonds.
    1.2       Form of Underwriting Agreement for Debt Securities.
    4.1       Form(s) of Supplemental Indenture relating to First Mortgage Bonds
              (to be filed as Exhibit(s) by means of Form 8-K).
    4.2       Specimen(s) of First Mortgage Bonds (to be filed as Exhibit(s) by
              means of Form 8-K).
    4.3       Form(s) of Supplemental Indenture relating to Debt Securities (to
              be filed as Exhibit(s) by means of Form 8-K).
    4.4       Specimen(s) of Debt Securities (to be filed as Exhibit(s) by means
              of Form 8-K).
    5.1       Opinion of Snell & Wilmer L.L.P.
    12.1      Computation of Ratio of Earnings to Fixed Charges.
    23.1      Consent of Deloitte & Touche LLP.
    23.2      Consent of Snell & Wilmer L.L.P. (included in Opinion filed as
              Exhibit No. 5.1).
    24.1      Power of Attorney (see II-6).
    25.1      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Bank of New York, as Bond Trustee under the Mortgage.
    25.2      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Bank of New York, as Trustee under the Indenture
              relating to the subordinated Debt Securities.
    25.3      Form T-1 Statement of Eligibility under the Trust Indenture Act of
              1939 of The Chase Manhattan Bank, as Trustee under the Indenture
              relating to the senior Debt Securities.

                                   EXHIBIT 1.1


                         ARIZONA PUBLIC SERVICE COMPANY

                              FIRST MORTGAGE BONDS


                             UNDERWRITING AGREEMENT

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

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 $525,000,000
in  aggregate  principal  amount  of its  First  Mortgage  Bonds  (the  "Bonds")
registered  under the registration  statements  referred to in Section 2(a). The
Bonds will be issued  under its  Mortgage  and Deed of Trust dated as of July 1,
1946, to The Bank of New York, as successor Trustee, as amended and supplemented
by fifty-five indentures  supplemental thereto (the "Mortgage"),  and as further
amended  and  supplemented  by one or more  additional  Supplemental  Indentures
relating to the Bonds (the  "Supplemental  Indentures") (the Mortgage as amended
and supplemented by such  Supplemental  Indentures  being sometimes  hereinafter
referred to as the "Indenture"). The Bonds will be issued in one or more series,
which series may vary as to interest rates,  maturities,  redemption provisions,
selling prices, and other terms, with all such terms for any particular issue of
the Bonds being determined at the time of sale.  Particular  issues of the Bonds
may be sold from time to time to one or more of the firms to whom this Agreement
is addressed, and to such other purchasers as the Company shall designate and as
shall  agree  in  writing  to  comply  with the  terms  and  conditions  of this
Agreement, for resale in accordance with the terms of offering determined at the
time of sale. The Bonds involved in any such offering are  hereinafter  referred
to as the  "Purchased  Bonds," the parties  that agree to purchase  the same are
hereinafter  referred to as the  "Underwriters" of such Purchased Bonds, and the
representative or  representatives  of the Underwriters,  if any, specified in a
Terms  Agreement  referred  to in Section 3 are  hereinafter  referred to as the
"Representatives."
<PAGE>
     2.  REPRESENTATIONS  AND WARRANTIES OF THE COMPANY. In connection with each
offering of the Purchased  Bonds,  the Company  represents  and warrants to, and
agrees with, the several Underwriters that:

          (a) A registration  statement (No.  333-58445) relating to $25,000,000
     of  the  Bonds,   unsecured  debentures,   notes,  or  other  evidences  of
     indebtedness  (the  "Securities"),  or the  Company's  senior  notes  and a
     registration statement (No. 333-____) relating to $500,000,000 of the Bonds
     or  Securities   (including  a  combined   prospectus  relating  to  up  to
     $525,000,000 of the Bonds or Securities) were filed with the Securities and
     Exchange  Commission (the  "Commission")  and have become  effective.  Such
     registration  statements,  as  each is  amended  at the  time of the  Terms
     Agreement  referred to in Section 3 relating to the  Purchased  Bonds,  are
     hereinafter  referred  to as the  "First  Registration  Statement"  and the
     "Second  Registration  Statement,"  respectively,  and,  together  with any
     related  Rule 462(b)  registration  statement  or  amendment  thereto,  are
     hereinafter referred to collectively as the "Registration  Statements," and
     such  prospectus,  as  supplemented as contemplated by Section 3 to reflect
     the terms of the Purchased Bonds and terms of offering  thereof,  including
     all material  incorporated by reference therein, is hereinafter referred to
     as the "Prospectus."

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

                                       2
<PAGE>
          (c) An order of the  Arizona  Corporation  Commission  shall have been
     granted   authorizing  the  execution  and  delivery  of  the  Supplemental
     Indenture  relating to the Purchased Bonds and the issuance and sale of the
     Purchased  Bonds on the terms and  conditions  herein and in the Prospectus
     and the Terms Agreement  referred to in Section 3 relating to the Purchased
     Bonds,  and the approval or consent of no other public body or authority is
     necessary to the execution and delivery of such  Supplemental  Indenture or
     the validity of the issuance and sale of the Purchased Bonds, except as may
     be required under state securities or blue sky laws.

          (d) Except for  property  specifically  excepted  from the lien of the
     Indenture or released  therefrom in accordance with the terms thereof,  the
     Company  has good and  marketable  title in fee  simple,  except  for items
     described in (A), (B), and (C) below, to all of the real property purported
     in the Indenture to be so held, good and valid  leasehold  interests in all
     properties  purported in the Indenture to be held under lease, and good and
     valid title to all other  properties  described in the Indenture as subject
     to the lien thereof (which  property  excludes (i) the combined cycle plant
     referred to in Note 9 of Notes to  Financial  Statements  in the  Company's
     Form 10-K  Report for the fiscal  year ended  December  31, 1998 (the "1998
     Form 10-K Report") incorporated by reference in the Registration Statements
     but includes the Company's  leasehold  and related  interests in that plant
     and (ii)  certain  leased  interests  in Unit 2 of the Palo  Verde  Nuclear
     Generating  Station referred to in Note 9 of Notes to Financial  Statements
     in  the  1998  Form  10-K  Report),   except  that  the   transmission  and
     distribution  lines of the Company,  other than those located on land owned
     in fee by the Company,  and the property described in Section 15 of Article
     IV of the Forty-first Supplemental Indenture, have been installed in public
     streets or alleys and in highways under  ordinances and permits  granted by
     the  various  governmental  bodies  having   jurisdiction,   or  have  been
     constructed on leaseholds,  easements or rights-of-way  granted, with minor
     exceptions,  by the apparent  owners of record of the land and such leases,
     easements,  or rights-of-way  are subject to any defects in or encumbrances
     on the title of the  respective  lessors of such leases or grantors of such
     easements or  rights-of-way;  title to the aforesaid  properties is subject
     only to: (A) the lien of the Mortgage, (B) Excepted Encumbrances as defined
     in the  Mortgage,  and (C) other liens,  encumbrances  or defects,  none of
     which,  individually  or in the  aggregate,  materially  interfere with the
     business or operations of the Company (with respect to leasehold  interests

                                       3
<PAGE>
     on the Navajo  Reservation,  this  representation  is intended and shall be
     understood  to mean  only  that the  Company  is the  owner  of the  rights
     conferred upon it by the leases from the Navajo Tribe relating to the sites
     on which the Navajo Plant and the Four Corners Plant are located,  and that
     while the Company is not aware of the assertion of any claim contesting the
     interest of the Navajo Tribe in the lands leased, the Company does not give
     any representation  with respect to the interest of the Navajo Tribe in the
     lands leased or with respect to the  enforceability  of such leases against
     the Navajo  Tribe);  the Mortgage,  subject only as above set forth in this
     clause, now constitutes,  and the Mortgage and the Supplemental  Indentures
     theretofore executed,  subject only as above set forth in this clause, when
     the  latter  shall have been duly  recorded  and  filed,  will  constitute,
     together and as a single instrument, a direct and valid first mortgage lien
     upon said  properties,  which include all of the  properties of the Company
     (other  than the  classes or items of  property  expressly  excepted in the
     Mortgage);  and all properties (other than the classes or items of property
     expressly  excepted in the  Mortgage or  expressly  released  from the lien
     thereof)  acquired  by the  Company  after  the  date  of the  Supplemental
     Indenture  relating to the Purchased  Bonds in each county in the States of
     Arizona and New Mexico in which the Mortgage and the Supplemental Indenture
     shall have been duly recorded and filed (and, as to which properties,  with
     respect to priority only, any necessary  recordation and/or filing has been
     accomplished,    including   therein   any   necessary    descriptions   of
     after-acquired  real property and real  property upon which  after-acquired
     fixtures are affixed) will,  upon such  acquisition,  become subject to the
     first mortgage lien thereof, subject, however, to Excepted Encumbrances and
     to liens, if any, existing or placed thereon at the time of the acquisition
     thereof by the Company and,  with respect to priority  only,  to liens,  if
     any, existing prior to the time of any necessary  recordation and/or filing
     by the Company.

          (e)  The  Company  holds  such  valid   franchises,   certificates  of
     convenience  and  necessity,  licenses,  and permits as are necessary  with
     respect to the  maintenance  and  operation of its property and business as
     now  conducted,  except that (A) the Company  from time to time makes minor
     extensions   of  its  system  prior  to  the  time  a  related   franchise,
     certificate,  license,  or  permit  is  procured,  (B)  from  time  to time
     communities  already being served by the Company  become  incorporated  and
     considerable  time may elapse  before a franchise is procured,  (C) certain
     franchises  may have expired prior to the  renegotiation  thereof,  (D) the
     Company may not have obtained certain permits or variances  relating to the
     environmental  requirements  described in any of its Form 10-K Report,  its
     Form 10-Q Reports, and/or its Form 8-K Reports incorporated by reference in

                                       4
<PAGE>
     the Registration  Statements,  (E) certain minor defects and exceptions may
     exist which,  individually  and in the aggregate,  are not deemed material,
     and  (F) the  Company  does  not  make  any  representation  regarding  the
     geographical scope of any franchise,  certificate,  license, or permit that
     is not specific as to its geographical scope.

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

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

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

                                       5
<PAGE>
          (b) If, at any time when a prospectus  relating to the Purchased Bonds
     is required to be delivered  under the Act, any event occurs as a result of
     which the  Prospectus  as then  amended or  supplemented  would  include an
     untrue  statement of a material  fact,  or omit to state any material  fact
     necessary to make the statements therein, in the light of the circumstances
     under which they were made,  not  misleading,  or if it is necessary at any
     time to amend or supplement the First  Registration  Statement,  the Second
     Registration  Statement,  or the  Prospectus  to comply  with the Act,  the
     Company  promptly will prepare and file with the Commission an amendment or
     supplement  that will  correct  such  statement or omission or an amendment
     that will effect such compliance.

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

          (d)  The   Company   will   furnish   to  the   Underwriters   or  the
     Representatives such copies of the Registration  Statements  (including one
     copy of the Second Registration  Statement for each Representative,  or for
     each Underwriter if there are no  Representatives,  and for the counsel for
     the Underwriters,  which is signed and includes all exhibits),  any related
     preliminary  prospectus  supplements  and  the  Prospectus,  including  all
     amendments  or  supplements  to  such  documents,   as  may  be  reasonably
     requested.

          (e) The Company  will arrange or  cooperate  in  arrangements  for the
     qualification  of the  Purchased  Bonds for sale and the  determination  of
     their  eligibility for investment  under the laws of such  jurisdictions as
     the  Underwriters or the  Representatives  designate and will continue such
     qualifications  in effect so long as required for the  distribution  of the
     Purchased Bonds, provided that the Company shall not be required to qualify
     as a foreign  corporation in any State, to consent to service of process in
     any State other than with respect to claims  arising out of the offering or
     sale of the Purchased Bonds, or to meet other requirements  deemed by it to
     be unduly burdensome.

          (f)  During  the  period  of five  years  after  the date of the Terms
     Agreement  relating to the Purchased Bonds, the Company will furnish to the
     Underwriters or the Representatives  thereunder, and, upon request, each of
     the other  Underwriters,  (i) as soon as practicable  after the end of each

                                       6
<PAGE>
     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 Bonds with respect to which the Terms  Agreement  relating to the
     Purchased Bonds has been entered for sale, and the  determination  of their
     eligibility for  investment,  under the laws of such  jurisdictions  as the
     Representatives  or,  if there  are no  Representatives,  the  Underwriters
     designate, and the printing of memoranda relating thereto, and for any fees
     charged by  investment  rating  agencies  for the  rating of the  Purchased
     Bonds.

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

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

          (a) The  Underwriters  or the  Representatives  shall have  received a
     letter from DELOITTE & TOUCHE LLP,  dated the date of the Terms  Agreement,
     confirming that they are independent  certified public  accountants  within
     the meaning of the Act and the applicable  published  Rules and Regulations

                                       7
<PAGE>
     thereunder,  and stating in effect that (i) in their  opinion the financial
     statements and schedules of the Company  examined by them and  incorporated
     by  reference  in the  Registration  Statements  comply  as to  form in all
     material  respects  with  the  applicable  accounting  requirements  of the
     Securities  Exchange Act of 1934 (the "1934 Act") and the  published  Rules
     and Regulations thereunder and (ii) on the basis of a reading of the latest
     available  interim  financial  statements  of  the  Company,  inquiries  of
     officials of the Company  responsible for financial and accounting matters,
     and other specified procedures, nothing came to their attention that caused
     them to believe that (A) the unaudited financial statements incorporated by
     reference,  if any, in the Registration Statements do not comply as to form
     in all material respects with the applicable accounting requirements of the
     1934 Act and the  published  Rules and  Regulations  thereunder  or are not
     stated  on a  basis  substantially  consistent  with  that  of the  audited
     financial   statements   incorporated  by  reference  in  the  Registration
     Statements,  (B) at  the  date  of  the  most  recent  available  unaudited
     financial  statements and at a specified date not more than five days prior
     to the date of this  Agreement,  there was any  increase  in the amounts of
     common stock, redeemable preferred stock, or non-redeemable preferred stock
     of the Company or any increase, exceeding $10,000,000, in long-term debt of
     the  Company  or,  at the  date  of the  most  recent  available  unaudited
     financial  statements there was any decrease in net assets as compared with
     amounts  shown in the most  recent  financial  statements  incorporated  by
     reference  in the  Registration  Statements,  or (C) for  the  twelve-month
     period ended at the date of the most recent available  unaudited  financial
     statements  there were any  decreases,  exceeding  3%, as compared with the
     twelve-month  period  ended  at the  date  of  the  most  recent  financial
     statements incorporated by reference in the Registration Statements, in the
     amounts of total revenues or net income,  except in all cases for increases
     or decreases which result from the declaration or payment of dividends,  or
     which the Registration  Statements  (including any material incorporated by
     reference  therein)  disclose  have  occurred  or may  occur,  or which are
     described in such letter.

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

          (c) Subsequent to the execution of the Terms Agreement relating to the
     Purchased  Bonds,  (i) there shall not have  occurred  any  change,  or any

                                       8
<PAGE>
     development  involving a prospective  change, in or affecting  particularly
     the business or properties of the Company or its subsidiaries which, in the
     judgment of a majority in  interest  of the  Underwriters  under such Terms
     Agreement, including any Representatives, materially impairs the investment
     quality  of the  Purchased  Bonds,  (ii)  there  shall not have  occurred a
     suspension or material limitation in trading in securities generally on the
     New York Stock  Exchange,  (iii)  there  shall not have  occurred a general
     moratorium on commercial  banking activities in New York declared by either
     Federal  or New  York  State  authorities,  (iv)  no  rating  of any of the
     Company's debt securities shall have been lowered and there shall have been
     no public  announcement  that any such debt  securities have been placed on
     CreditWatch,  Watchlist,  or under any similar  surveillance or review,  in
     each case with negative implications,  by any recognized rating agency, and
     (v) there  shall not have  occurred  any  outbreak or  escalation  of major
     hostilities in which the United States is involved,  any declaration of war
     by Congress or any other substantial national or international  calamity or
     emergency if, in the judgment of a majority in interest of the Underwriters
     under such Terms Agreement,  including any  Representatives,  the effect of
     any such outbreak, escalation,  declaration, calamity or emergency makes it
     impractical or  inadvisable  to proceed with  completion of the sale of and
     payment for the Purchased Bonds.

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

               (i)  The  Company  is  a  corporation  duly  organized,   validly
          existing,  and in good standing under the laws of the State of Arizona
          and has full corporate power and authority to carry on its business as
          presently  conducted;  and the Company is duly  qualified as a foreign
          corporation  to do business  and is in good  standing in the 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  Bonds have been duly  authorized,  executed,
          authenticated,  issued,  and delivered,  constitute  valid and legally
          binding  obligations  of the  Company  entitled  to the  benefits  and
          security  provided by the Indenture (except as the same may be limited
          by (a)  general  principles  of equity or by  bankruptcy,  insolvency,
          reorganization,  arrangement,  moratorium,  or other laws or equitable
          principles  relating to or affecting  the  enforcement  of  creditors'
          rights  generally or the  enforcement of the security  provided by the
          Indenture,  (b)  the  necessity  for  compliance  with  the  statutory
          procedural  requirements  governing  the  exercise  of  remedies  by a
          secured  creditor,  and (c) the  qualification  that certain  waivers,
          procedures,  remedies, and other provisions of the Purchased Bonds and
          the Indenture may be unenforceable  under or limited by the law of the
          State of Arizona; however, such law does not in such counsel's opinion
          substantially  prevent  the  practical  realization  of  the  benefits
          intended by such documents) and conform to the description  thereof in
          the Prospectus;

               (iii) The  Indenture  has been  duly  authorized,  executed,  and
          delivered,  has been duly qualified under the Trust Indenture Act, and
          constitutes a valid and binding  instrument  enforceable in accordance
          with  its  terms  except  as the same may be  limited  by (a)  general
          principles  of equity or by  bankruptcy,  insolvency,  reorganization,
          arrangement,   moratorium,  or  other  laws  or  equitable  principles
          relating  to  or  affecting  the  enforcement  of  creditors'   rights
          generally  or  the  enforcement  of  the  security   provided  by  the
          Indenture,  (b)  the  necessity  for  compliance  with  the  statutory
          procedural  requirements  governing  the  exercise  of  remedies  by a
          secured  creditor,  and (c) the  qualification  that certain  waivers,
          procedures,

                                       9
<PAGE>
          remedies,  and  other  provisions  of  the  Purchased  Bonds  and  the
          Indenture  may be  unenforceable  under or  limited  by the law of the
          State of Arizona; however, such law does not in such counsel's opinion
          substantially  prevent  the  practical  realization  of  the  benefits
          intended by such documents;

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

                                       10
<PAGE>
          engineer  of the Company  which shall be attached to such  opinion and
          such  opinion may state that no other  investigation  or inquiry  with
          respect  thereto has been made);  the Mortgage,  subject only as above
          set forth in this clause,  now  constitutes,  and the Mortgage and the
          Supplemental  Indentures  theretofore executed,  subject only as above
          set  forth in this  clause,  when the  latter  shall  have  been  duly
          recorded  and  filed,  will  constitute,  together  and  as  a  single
          instrument, a direct and valid first mortgage lien upon said property;
          and all  properties  (other  than the  classes  or  items of  property
          expressly excepted in the Mortgage or expressly released from the lien
          thereof)  acquired by the Company  after the date of the  Supplemental
          Indenture  relating to the Purchased Bonds in each county in the State
          of Arizona in which the Mortgage and the Supplemental  Indenture shall
          have been duly recorded and filed and, with respect to priority  only,
          any  necessary   recordation   and/or  filing  has  been  accomplished
          (including therein any necessary  descriptions of after-acquired  real
          property  and real  property  upon which  after-acquired  fixtures are
          affixed)  will,  upon such  acquisition,  become  subject to the first
          mortgage lien thereof,  subject, however, to Excepted Encumbrances and
          to  liens,  if any,  existing  or  placed  thereon  at the time of the
          acquisition thereof by the Company and, with respect to priority only,
          to  liens,  if  any,  existing  prior  to the  time  of any  necessary
          recordation and/or filing by the Company;

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

               (vi) With certain  exceptions,  a public  service  corporation is
          required to obtain  certificates of convenience and necessity from the
          Arizona  Corporation  Commission  under  A.R.S.  Section  40-281.A for
          construction  of  its  lines,  plant,  services,  or  systems,  or any
          extensions  thereof,  within  the  State  of  Arizona,  and to  obtain
          franchises   or  similar   consents  or  permits  from   counties  and
          incorporated  municipalities  under  A.R.S.  Section  40-283.A for the
          construction,  operation, and maintenance of transmission lines within

                                       11
<PAGE>
          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;

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

               (viii)   The  First   Registration   Statement   and  the  Second
          Registration  Statement have become  effective  under the Act, and, to
          the best of the  knowledge of such counsel,  no stop order  suspending
          the  effectiveness of the First  Registration  Statement or the Second
          Registration  Statement  has been issued and no  proceedings  for that
          purpose have been instituted or are pending or contemplated  under the
          Act,  and each part of the  Registration  Statements  relating  to the
          Bonds, when such part became effective, and the Prospectus,  as of the
          date of the  Prospectus  Supplement,  and each amendment or supplement
          thereto, as of their respective effective or issue dates,  complied as

                                       12
<PAGE>
          to form in all material respects with the requirements of the Act, the
          Trust  Indenture Act, and the published  Rules and  Regulations;  such
          counsel  has no reason to  believe  that any part of the  Registration
          Statements,  when such part became effective, or the Prospectus, as of
          the date of the Prospectus  Supplement,  or as of the Closing Date, or
          any amendment or supplement thereto, as of their respective  effective
          or issue  dates,  or as of the  Closing  Date,  contained  any  untrue
          statement  of a material  fact or omitted to state any  material  fact
          required  to be stated  therein or  necessary  to make the  statements
          therein  not  misleading;   the   descriptions  in  the   Registration
          Statements  and  Prospectus  of  statutes,   legal  and   governmental
          proceedings and contracts, and other documents are accurate and fairly
          present  the  information  required  to be  shown;  and to the  actual
          knowledge  of those  persons in the  lawyer  group  described  in such
          opinion, there are no legal or governmental proceedings required to be
          described in the  Prospectus  that are not described as required,  nor
          any contracts or documents of a character  required to be described in
          the  Registration  Statements or Prospectus or to be filed as exhibits
          to the  Registration  Statements  that are not  described and filed as
          required  (it being  understood  that such  counsel  need  express  no
          opinion  as to  the  financial  statements  or  other  financial  data
          contained in the Registration Statements or the Prospectus); and

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

     In giving  such  opinion,  (a) Snell & Wilmer  L.L.P.  may rely solely upon
certificates  of the  Company  as to any  factual  matters  upon  which any such
opinions  are based and may rely upon the  opinion  of  Keleher & McLeod,  P.A.,
referred to below,  as to all  matters  governed by the laws of the State of New
Mexico,  but the opinion of Snell & Wilmer L.L.P.  shall state that, though they
are members of the Arizona Bar and do not hold  themselves out as experts on the
laws of the  State of New  Mexico,  they  have  made a study of the laws of such
State  insofar  as such laws are  involved  in the  conclusions  stated in their
opinion, other than such laws as relate to matters of title, and from such study
it is their opinion that such laws support such  conclusions  and that, in their
opinion,  the Underwriters and they are justified to such extent in relying upon
the opinion of Keleher & McLeod,  P.A.;  and (b) the lawyer group referred to in
such opinion will mean those lawyers in the offices of Snell & Wilmer L.L.P. who

                                       13
<PAGE>
(i) have billed any time on the  particular  transaction  to which such  opinion
relates or (ii) have  billed  more than ten hours to any  Company  matter in the
twelve-month  period  preceding  the date on which the list of such  lawyers was
compiled for purposes of inquiry pursuant to such opinion.

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

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

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

               (iii)  Assuming  that the Company has good and valid title to all
          of the  personal  property  located  in the  State of New  Mexico  and
          described  in the  Indenture  as  subject to the lien  thereof  (which
          property shall not include fixtures) ("Personal Property"),  in giving
          the opinions  described  below with respect to any liens,  defects and
          encumbrances on such title to such Personal Property, such counsel may
          rely solely upon,  and assume the accuracy of, a search of the Uniform
          Commercial Code Financing  Statements  filed in the records of the New
          Mexico  Secretary  of State and may assume  that there are no liens or
          other  encumbrances  on personal  property  (as used in the New Mexico

                                       14
<PAGE>
          Uniform  Commercial  Code) of the Company  located in the State of New
          Mexico other than liens or other encumbrances that have been perfected
          by  filing  with  the New  Mexico  Secretary  of State  under  Section
          55-9-401,  New  Mexico  Statutes  Annotated  1978;  such title to such
          Personal  Property is subject  only to: (A) the lien of the  Mortgage,
          (B) Excepted  Encumbrances  as defined in the Mortgage,  and (C) other
          liens, encumbrances, or defects, none of which, individually or in the
          aggregate,  in the opinion of such counsel,  materially interfere with
          the business or operations of the Company (in determining  whether any
          such other liens,  encumbrances,  or defects materially interfere with
          the  business or  operations  of the  Company,  such  counsel may rely
          solely  upon a  certificate  of an officer or  engineer of the Company
          which  shall be attached  to such  opinion and such  opinion may state
          that no other  investigation  or inquiry with respect thereto has been
          made);  the Mortgage,  subject only as above set forth in this clause,
          now  constitutes,  and the  Mortgage and the  Supplemental  Indentures
          theretofore executed,  subject only as above set forth in this clause,
          when the  latter  shall  have  been  duly  recorded  and  filed,  will
          constitute,  together and as a single  instrument,  a direct and valid
          first  mortgage lien upon such Personal  Property;  and all properties
          (other than the classes or items of property expressly excepted in the
          Mortgage or expressly  released from the lien thereof) acquired by the
          Company after the date of the Supplemental  Indenture  relating to the
          Purchased Bonds in each county in the State of New Mexico in which the
          Mortgage and the Supplemental  Indenture shall have been duly recorded
          and  filed  and,  with  respect  to  priority   only,   any  necessary
          recordation and/or filing has been accomplished (including therein any
          necessary  descriptions  of  after-acquired  real  property  and  real
          property upon which  after-acquired  fixtures are affixed) will,  upon
          such  acquisition,  become subject to the first mortgage lien thereof,
          subject,  however,  to  Excepted  Encumbrances  and to liens,  if any,
          existing or placed thereon at the time of the  acquisition  thereof by
          the Company and,  with  respect to priority  only,  to liens,  if any,
          existing prior to the time of any necessary  recordation and/or filing
          by the Company; and

               (iv) The Company is the owner of the rights  conferred upon it by
          the leases  from the Navajo  Tribe  relating  to the site on which the
          Four  Corners  plant is located and while such counsel is not aware of

                                       15
<PAGE>
          the assertion of any claim contesting the interest of the Navajo Tribe
          in the lands leased, such counsel shall not be required to express any
          opinion  with respect to the interest of the Navajo Tribe in the lands
          leased or with respect to the  enforceability  of such leases  against
          the Navajo Tribe.

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

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

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

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

                                       16
<PAGE>
     The Company will furnish the Underwriters or the Representatives  with such
conformed copies of such opinions,  certificates,  letters, and documents as may
be reasonably requested.

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

          (b) Each  Underwriter  will severally  indemnify and hold harmless the
     Company,  each of its  directors,  each of its officers who have signed the
     Registration Statements,  and each person, if any, who controls the Company
     within the  meaning of the Act,  against any losses,  claims,  damages,  or
     liabilities  to  which  the  Company  or any  such  director,  officer,  or
     controlling person may become subject, under the Act or otherwise,  insofar
     as such losses,  claims,  damages,  or  liabilities  (or actions in respect
     thereof)  arise out of or are based  upon any untrue  statement  or alleged
     untrue  statement  of  any  material  fact  contained  in any  part  of the
     Registration  Statements  relating  to the  Bonds,  when such  part  became
     effective, any preliminary prospectus or preliminary prospectus supplement,
     the Prospectus,  or any amendment or supplement thereto, or arise out of or
     are based upon the  omission  or the alleged  omission  to state  therein a
     material  fact  required  to be stated  therein  or  necessary  to make the
     statements therein not misleading,  in each case to the extent, but only to
     the extent,  that such untrue  statement  or alleged  untrue  statement  or
     omission or alleged  omission was made in reliance  upon and in  conformity

                                       17
<PAGE>
     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) or (b) above on the  following
     basis: (l) if such loss, claim, damage,  liability,  or action arises under
     subsection  (a) above,  then (i) in such  proportion as is  appropriate  to
     reflect the relative  benefits  received by the Company on the one hand and
     the Underwriters on the other from the offering of the Bonds or (ii) if the

                                       18
<PAGE>
     allocation provided by clause (i) above is not permitted by applicable law,
     in such  proportion  as is  appropriate  to reflect  not only the  relative
     benefits referred to in clause (i) above but also the relative fault of the
     Company  on the one hand and the  Underwriters  on the other in  connection
     with the  statements or omissions  which  resulted in such losses,  claims,
     damages  or   liabilities   as  well  as  any  other   relevant   equitable
     considerations;  and (2) if such loss, claim, damage,  liability, or action
     arises  under  subsection  (b)  above,   then  in  such  proportion  as  is
     appropriate  to reflect the  relative  fault of the Company on the one hand
     and the  Underwriters  on the other in  connection  with the  statements or
     omissions which resulted in such losses,  claims, damages or liabilities as
     well as any other relevant  equitable  considerations.  For the purposes of
     clause (1) above, the relative  benefits received by the Company on the one
     hand and the  Underwriters  on the other  shall be deemed to be in the same
     proportion  as the total net proceeds from the offering  (before  deducting
     expenses) received by the Company bear to the total underwriting  discounts
     and commissions  received by the Underwriters.  For the purposes of clauses
     (1) and (2) above,  the relative fault shall be determined by reference to,
     among other  things,  whether the untrue or alleged  untrue  statement of a
     material fact or the omission or alleged  omission to state a material fact
     relates to information  supplied by the Company or the Underwriters and the
     parties' relative intent, knowledge,  access to information and opportunity
     to correct or prevent such untrue statement or omission. The amount paid by
     an  indemnified  party  as a  result  of the  losses,  claims,  damages  or
     liabilities  referred to in the first sentence of this subsection (d) shall
     be deemed to include  any legal or other  expenses  reasonably  incurred by
     such  indemnified  party in connection with  investigating or defending any
     action or claim  which is the  subject of this  subsection  (d).  No person
     guilty of fraudulent misrepresentation (within the meaning of Section 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 Bonds pursuant to this Agreement and the
Terms Agreement and the principal amount of Purchased Bonds that such defaulting
Underwriter or  Underwriters  agreed but failed to purchase is ten percent (10%)
or less of the principal amount of Purchased Bonds to which such Terms Agreement
relates,   the  Underwriters  or  the   Representatives  may  make  arrangements
satisfactory  to the Company for the purchase of such  Purchased  Bonds by other
persons, including any of the Underwriters, but if no such arrangements are made
by the Closing Date the nondefaulting Underwriters shall be obligated severally,

                                       19
<PAGE>
in proportion  to their  respective  commitments  hereunder and under such Terms
Agreement,  to purchase the Purchased Bonds that such defaulting  Underwriter or
Underwriters  agreed but failed to purchase.  If any Underwriter or Underwriters
so default and the aggregate principal amount of Purchased Bonds with respect to
which such default or defaults occur is more than the above-described amount and
arrangements  satisfactory to the remaining Underwriters and the Company for the
purchase of such Purchased Bonds by other persons are not made within thirty-six
hours after such default,  the Terms Agreement will terminate  without liability
on the part of any non-defaulting Underwriter or the Company, except as provided
in Section 8. As used in this  Agreement,  the term  "Underwriter"  includes any
person  substituted for an Underwriter  under this Section.  Nothing herein will
relieve a defaulting Underwriter from liability for its default.

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

     9.  NOTICES.  All  communications  hereunder  relating  to any  offering of
Purchased  Bonds will be in writing,  and, if sent to the  Underwriters,  may be
mailed, delivered, or telecopied and confirmed to the Representative first named
in the Terms Agreement  relating to such Purchased Bonds or the  Underwriters at
their  addresses  furnished  to the  Company  in  writing  for  the  purpose  of
communications; provided, however, that any notice to an Underwriter pursuant to
Section 6 will be mailed,  delivered,  or telecopied  and confirmed to each such
Underwriter  at its own  address.  All  communications  hereunder to the Company
shall be  mailed  to the  Company,  Attention:  Treasurer,  at P.O.  Box  53999,
Phoenix,  Arizona 85072-3999,  or delivered,  or telecopied and confirmed to the
Company at 400 North Fifth Street, Phoenix, Arizona 85004.

     10. SUCCESSORS.  This Agreement will inure to the benefit of and be binding
upon the parties hereto and such  Underwriters as are named in Terms  Agreements
and their  respective  successors and the officers and directors and controlling

                                       20
<PAGE>
persons  referred  to in Section 6, and no other  person  will have any right or
obligation hereunder.

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

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

                                       21
<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 several  Underwriters in
accordance with its terms.

                                          Very truly yours,

                                          ARIZONA PUBLIC SERVICE COMPANY


                                          By
                                             -----------------------------------
                                             Treasurer


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


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

                                   EXHIBIT 1.2


                         ARIZONA PUBLIC SERVICE COMPANY

                                   SECURITIES


                             UNDERWRITING AGREEMENT

                                   ----------

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 $525,000,000
in  aggregate  principal  amount  of its  unsecured  debentures,  notes or other
evidences of indebtedness (the  "Securities")  registered under the registration
statements  referred to in Section 2(a). The Securities will be issued under the
Indenture,  dated as of January  15,  1998,  between  the  Company and The Chase
Manhattan Bank, as Trustee,  (the  "Indenture"),  as amended and supplemented by
one or more Supplemental Indentures between the Company and the Trustee (each, a
"Supplemental  Indenture")  (the Indenture as amended and  supplemented  by such
Supplemental   Indentures  being  sometimes   hereinafter  referred  to  as  the
"Indenture").  The Securities will be issued in one or more series, which series
may  vary as to  interest  rates,  maturities,  redemption  provisions,  selling
prices,  and other terms,  with all such terms for any  particular  issue of the
Securities  being  determined  at the time of  sale.  Particular  issues  of the
Securities  may be sold  from  time to time to one or more of the  firms to whom
this Agreement is addressed,  and to such other  purchasers as the Company shall
designate and as shall agree in writing to comply with the terms and  conditions
of this  Agreement,  for  resale  in  accordance  with  the  terms  of  offering
determined at the time of sale. The Securities involved in any such offering are
hereinafter referred to as the "Purchased Securities," the party or parties that
agree to purchase the same are hereinafter  referred to as the "Underwriters" of
such Purchased  Securities,  and the  representative or  representatives  of the
Underwriters,  if any,  specified in a Terms Agreement  referred to in Section 3
are hereinafter referred to as the "Representatives."
<PAGE>

     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 $25,000,000
     of the Securities, the Company's first mortgage bonds (the "Bonds"), or the
     Company's senior notes and a registration statement (No. 333-____) relating
     to  $500,000,000  of the  Securities  or the Bonds  (including  a  combined
     prospectus  relating to up to $525,000,000 of the Securities or Bonds) were
     filed with the Securities and Exchange  Commission (the  "Commission")  and
     have become effective.  Such registration statements, as each is amended at
     the time of the Terms  Agreement  referred  to in Section 3 relating to the
     Purchased   Securities,   are   hereinafter   referred  to  as  the  "First
     Registration   Statement"   and  the   "Second   Registration   Statement,"
     respectively,  and, together with any related 462(b) registration statement
     or amendment  thereto,  are  hereinafter  referred to  collectively  as the
     "Registration   Statements"  and  such   prospectus,   as  supplemented  as
     contemplated by Section 3 to reflect the terms of the Purchased  Securities
     and terms of offering  thereof,  including  all  material  incorporated  by
     reference therein, is hereinafter referred to as the "Prospectus."

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

                                       2
<PAGE>
          (c) An order of the  Arizona  Corporation  Commission  shall have been
     granted   authorizing  the  execution  and  delivery  of  the  Supplemental
     Indenture relating to the Purchased Securities and the issuance and sale of
     the  Purchased  Securities  on the terms and  conditions  herein and in the
     Prospectus and the Terms Agreement referred to in Section 3 relating to the
     Purchased  Securities,  and the approval or consent of no other public body
     or  authority  is  necessary  to  the   execution   and  delivery  of  such
     Supplemental  Indenture  or the  validity of the  issuance  and sale of the
     Purchased  Securities,  except as may be required under state securities or
     blue sky laws.

          (d)  The  Company  holds  such  valid   franchises,   certificates  of
     convenience  and  necessity,  licenses,  and permits as are necessary  with
     respect to the  maintenance  and  operation of its property and business as
     now  conducted,  except that (A) the Company  from time to time makes minor
     extensions   of  its  system  prior  to  the  time  a  related   franchise,
     certificate,  license,  or  permit  is  procured,  (B)  from  time  to time
     communities  already being served by the Company  become  incorporated  and
     considerable  time may elapse  before a franchise is procured,  (C) certain
     franchises  may have expired prior to the  renegotiation  thereof,  (D) the
     Company may not have obtained certain permits or variances  relating to the
     environmental  requirements  described in any of its Form 10-K Report,  its
     Form 10-Q Reports, and/or its Form 8-K Reports incorporated by reference in
     the Registration  Statements,  (E) certain minor defects and exceptions may
     exist which,  individually  and in the aggregate,  are not deemed material,
     and  (F) the  Company  does  not  make  any  representation  regarding  the
     geographical scope of any franchise,  certificate,  license, or permit that
     is not specific as to its geographical scope.

     3. PURCHASE AND OFFERING.  The obligation of the  Underwriters to purchase,
and the  obligation  of the Company to sell,  the Purchased  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

                                       3
<PAGE>
rates, maturity,  redemption provisions, and sinking fund requirements,  if any.
The Terms  Agreement  shall also  specify  (by  incorporation  by  reference  or
otherwise) the time and date of delivery and payment (the "Closing  Date"),  the
place of delivery  and  payment,  and any details of the terms of offering  that
should be reflected in the prospectus supplement relating to the offering of the
Purchased  Securities (the "Prospectus  Supplement").  It is understood that the
Underwriters  will offer the Purchased  Securities  for sale as set forth in the
Prospectus.  The  obligations  of the  Underwriters  to purchase  the  Purchased
Securities shall be several and not joint.  Except as may otherwise be set forth
in the Terms Agreement,  the Purchased Securities will be in definitive form and
in such  denominations  and  registered  in such names as the  Underwriters  may
request.

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

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

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

                                       4
<PAGE>
     least  12  months   beginning  after  the  effective  date  of  the  Second
     Registration  Statement  (as defined in Rule 158(c)  under the Act),  which
     will satisfy the  provisions  of Section 11(a) of the Act and the rules and
     regulations thereunder.

          (d)  The   Company   will   furnish   to  the   Underwriters   or  the
     Representatives such copies of the Registration  Statements  (including one
     copy of the Second Registration  Statement for each Representative,  or for
     each Underwriter if there are no  Representatives,  and for the counsel for
     the Underwriters,  which is signed and includes all exhibits),  any related
     preliminary  prospectus  supplements  and  the  Prospectus,  including  all
     amendments  or  supplements  to  such  documents,   as  may  be  reasonably
     requested.

          (e) The Company  will arrange or  cooperate  in  arrangements  for the
     qualification of the Purchased Securities for sale and the determination of
     their  eligibility for investment  under the laws of such  jurisdictions as
     the  Underwriters or the  Representatives  designate and will continue such
     qualifications  in effect so long as required for the  distribution  of the
     Purchased  Securities,  provided  that the Company shall not be required to
     qualify as a foreign  corporation  in any  State,  to consent to service of
     process in any State other than with  respect to claims  arising out of the
     offering or sale of the Purchased Securities, or to meet other requirements
     deemed by it to be unduly burdensome.

          (f)  During  the  period  of five  years  after  the date of the Terms
     Agreement relating to the Purchased Securities, the Company will furnish to
     the Underwriters or the Representatives thereunder, and, upon request, each
     of the other Underwriters, (i) as soon as practicable after the end of each
     fiscal year, a balance sheet and statements of income and retained earnings
     of the Company as at the end of and for such year, all in reasonable detail
     and certified by independent  public  accountants,  and (ii) (A) as soon as
     practicable  after the 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

                                       5
<PAGE>
     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 Company of its
obligations hereunder, and to the following additional conditions precedent:

          (a) The  Underwriters  or the  Representatives  shall have  received a
     letter from DELOITTE & TOUCHE LLP,  dated the date of the Terms  Agreement,
     confirming that they are independent  certified public  accountants  within
     the meaning of the Act and the applicable  published  Rules and Regulations
     thereunder,  and stating in effect that (i) in their  opinion the financial
     statements and schedules of the Company audited by them and incorporated by
     reference in the Registration  Statements comply as to form in all material
     respects with the  applicable  accounting  requirements  of the  Securities
     Exchange  Act of  1934  (the  "1934  Act")  and  the  published  Rules  and
     Regulations  thereunder  and (ii) on the basis of a reading  of the  latest
     available  interim  financial  statements  of  the  Company,  inquiries  of
     officials of the Company  responsible for financial and accounting matters,
     and other specified procedures, nothing came to their attention that caused

                                       6
<PAGE>
     them to believe that (A) the unaudited financial statements incorporated by
     reference,  if any, in the Registration Statements do not comply as to form
     in all material respects with the applicable accounting requirements of the
     1934 Act and the  published  Rules and  Regulations  thereunder  or are not
     stated  on a  basis  substantially  consistent  with  that  of the  audited
     financial   statements   incorporated  by  reference  in  the  Registration
     Statements,  (B) at  the  date  of  the  most  recent  available  unaudited
     financial  statements and at a specified date not more than five days prior
     to the date of this  Agreement,  there was any  increase  in the amounts of
     common stock, redeemable preferred stock, or non-redeemable preferred stock
     of the Company or any increase, exceeding $10,000,000, in long-term debt of
     the  Company  or,  at the  date  of the  most  recent  available  unaudited
     financial  statements there was any decrease in net assets as compared with
     amounts  shown in the most  recent  financial  statements  incorporated  by
     reference  in the  Registration  Statements,  or (C) for  the  twelve-month
     period ended at the date of the most recent available  unaudited  financial
     statements  there were any  decreases,  exceeding  3%, as compared with the
     twelve-month  period  ended  at the  date  of  the  most  recent  financial
     statements incorporated by reference in the Registration Statements, in the
     amounts of total revenues or net income,  except in all cases for increases
     or decreases which result from the declaration or payment of dividends,  or
     which the Registration  Statements  (including any material incorporated by
     reference  therein)  disclose  have  occurred  or may  occur,  or which are
     described in such letter.

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

          (c) Subsequent to the execution of the Terms Agreement relating to the
     Purchased Securities,  (i) there shall not have occurred any change, or any
     development  involving a prospective  change, in or affecting  particularly
     the business or properties of the Company or its subsidiaries which, in the
     judgment of a majority in  interest  of the  Underwriters  under such Terms
     Agreement, including any Representatives, materially impairs the investment
     quality of the Purchased  Securities,  (ii) there shall not have occurred a
     suspension or material limitation in trading in securities generally on the
     New York Stock  Exchange,  (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

                                       7
<PAGE>
     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, constitute valid and
          legally  binding  obligations of the Company  entitled to the benefits
          provided  by the  Indenture  (except as the same may be limited by (a)
          general   principles   of   equity  or  by   bankruptcy,   insolvency,
          reorganization,  arrangement,  moratorium,  or other laws or equitable
          principles  relating to or affecting  the  enforcement  of  creditors'
          rights  generally  and (b) the  qualification  that  certain  waivers,
          procedures, remedies, and other provisions of the Purchased Securities
          and the Indenture may be unenforceable  under or limited by the law of
          the State of  Arizona;  however,  such law does not in such  counsel's
          opinion   substantially  prevent  the  practical  realization  of  the

                                       8
<PAGE>
          benefits  intended by such  documents) and conform to the  description
          thereof in the Prospectus;

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

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

                                       9
<PAGE>
          and exceptions may exist which, individually and in the aggregate, are
          not deemed  material,  and (E) such  counsel  need not be  required to
          express any opinion regarding the geographical scope of any franchise,
          certificate,  license,  or  permit  that  is  not  specific  as to its
          geographical scope;

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

               (vi) The First Registration Statement and the Second Registration
          Statement have become effective under the Act, and, to the best of the
          knowledge of such counsel,  no stop order suspending the effectiveness
          of  the  First  Registration  Statement  or  the  Second  Registration
          Statement  has been issued and no  proceedings  for that  purpose have
          been instituted or are pending or contemplated under the Act, and each
          part of the Registration  Statements relating to the Securities,  when
          such part became effective, and the Prospectus,  as of the date of the
          Prospectus Supplement, and each amendment or supplement thereto, as of
          their respective effective or issue dates,  complied as to form in all
          material  respects  with  the  requirements  of  the  Act,  the  Trust
          Indenture Act, and the published Rules and  Regulations;  such counsel
          has no reason to believe that any part of the Registration Statements,
          when such part became effective, or the Prospectus,  as of the date of
          the Prospectus Supplement, or as of the Closing Date, or any amendment
          or  supplement  thereto,  as of their  respective  effective  or issue
          dates, or as of the Closing Date,  contained any untrue statement of a

                                       10
<PAGE>
          material  fact or omitted to state any  material  fact  required to be
          stated  therein  or  necessary  to make  the  statements  therein  not
          misleading;  the  descriptions  in  the  Registration  Statements  and
          Prospectus  of  statutes,   legal  and  governmental  proceedings  and
          contracts,  and other  documents  are accurate and fairly  present the
          information required to be shown; and to the actual knowledge of those
          persons in the lawyer group  described in such  opinion,  there are no
          legal or  governmental  proceedings  required to be  described  in the
          Prospectus  that are not  described as required,  nor any contracts or
          documents of a character  required to be described in the Registration
          Statements   or   Prospectus  or  to  be  filed  as  exhibits  to  the
          Registration  Statements  that are not described and filed as required
          (it being  understood  that such counsel need express no opinion as to
          the financial  statements  or other  financial  data  contained in the
          Registration Statements or the Prospectus); and

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

     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.

                                       11
<PAGE>
          (e) The  Underwriters  or the  Representatives  shall have received an
     opinion of Keleher & McLeod,  P.A.,  New Mexico  counsel  for the  Company,
     dated the Closing Date, to the effect that:

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

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

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

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

                                       12
<PAGE>
     Mexico  upon the  opinions of Snell & Wilmer  L.L.P.  and Keleher & McLeod,
     P.A., referred to above.

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

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

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

     6. Indemnification.

          (a) The Company will indemnify and hold harmless each  Underwriter and
     each person,  if any, who controls such  Underwriter  within the meaning of
     the Act  against  any  losses,  claims,  damages or  liabilities,  joint or
     several,  to which such Underwriter or such  controlling  person may become
     subject,  under  the Act or  otherwise,  insofar  as such  losses,  claims,
     damages, or liabilities (or actions in respect thereof) arise out of or are
     based upon any untrue statement or alleged untrue statement of any material
     fact contained in any part of the Registration  Statements  relating to the
     Securities,  when such part became effective, any preliminary prospectus or
     preliminary  prospectus  supplement,  the  Prospectus,  or any amendment or
     supplement  thereto,  or arise out of or are  based  upon the  omission  or

                                       13
<PAGE>
     alleged  omission to state  therein a material  fact  required to be stated
     therein or necessary to make the  statements  therein not  misleading;  and
     will reimburse each  Underwriter and each such  controlling  person for any
     legal or other  expenses  reasonably  incurred by such  Underwriter or such
     controlling  person in connection with  investigating or defending any such
     loss, claim, damage,  liability,  or action;  provided,  however,  that the
     Company  will not be liable in any such  case to the  extent  that any such
     loss, claim,  damage, or liability arises out of or is based upon an untrue
     statement or alleged untrue  statement or omission or alleged omission made
     in any of such  documents in reliance upon and in  conformity  with written
     information  furnished to the Company by any Underwriter  specifically  for
     use therein.  This indemnity agreement will be in addition to any liability
     which the Company may otherwise have.

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

                                       14
<PAGE>
     under this  Section,  notify  the  indemnifying  party of the  commencement
     thereof;  but the  omission  so to notify the  indemnifying  party will not
     relieve it from any  liability  that it may have to any  indemnified  party
     otherwise  than  under  this  Section.  In case any such  action is brought
     against any indemnified  party, and it notifies the  indemnifying  party of
     the  commencement  thereof,  the  indemnifying  party will be  entitled  to
     participate  therein and, to the extent that it may wish,  jointly with any
     other indemnifying party similarly notified, to assume the defense thereof,
     with counsel satisfactory to such indemnified party (who shall not, without
     the  consent of the  indemnified  party,  be  counsel  to the  indemnifying
     party),  and after notice from the  indemnifying  party to such indemnified
     party of its election so to assume the defense  thereof,  the  indemnifying
     party will not be liable to such  indemnified  party under this Section for
     any legal or other expenses subsequently incurred by such indemnified party
     in  connection  with the defense  thereof  other than  reasonable  costs of
     investigation. An indemnifying party shall not be liable for any settlement
     of a claim or action effected without its written consent,  which shall not
     be unreasonably withheld.

          (d) If the indemnification provided for in this Section is unavailable
     or insufficient to hold harmless an indemnified  party for any loss, claim,
     damage, liability, or action described in subsection (a) or (b) above, then
     each  indemnifying  party shall contribute to the amount paid or payable by
     such  indemnified  party as a result  of the  losses,  claims,  damages  or
     liabilities  referred to in  subsection  (a) or (b) above on the  following
     basis: (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

                                       15
<PAGE>
     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  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

                                       16
<PAGE>
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.

     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

                                       17
<PAGE>
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.

                                       18
<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
                                        ----------------------------------------
                                                      Treasurer


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


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

                                       19

January 7, 2000



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

Ladies and Gentlemen:

     Reference is made to (a) your proposed  offering of up to $ 525,000,000  of
your securities (the  "Securities"),  as contemplated by the combined prospectus
contained in the Registration  Statement (the "Registration  Statement") on Form
S-3 to be filed by you on January  7, 2000,  with the  Securities  and  Exchange
Commission  under the  Securities  Act of 1933,  as amended (the  "Act"),  which
Securities  include (i) $ 500,000,000  of New Bonds,  Debt  Securities  (as such
terms are defined in the Registration Statement), or any combination thereof, to
be registered pursuant to the Registration  Statement,  and (ii) $ 25,000,000 of
New Bonds, Debt Securities,  or any combination thereof,  previously  registered
under Registration No. 333-58445; and (b) any registration statement registering
additional  Securities  pursuant to Rule  462(b) of the Act that  relates to the
Registration Statement (the "Rule 462(b) Registration Statement").

     We have examined originals or copies,  certified or otherwise identified to
our satisfaction,  of such corporate records, agreements, and other instruments,
certificates,   orders,   opinions,   correspondence   with  public   officials,
certificates provided by your officers and representatives,  and other documents
as we have deemed  necessary  or advisable  for the  purposes of  rendering  the
opinions set forth herein.

     Based on the foregoing,  it is our opinion that after (i) the  Registration
Statement, and the Rule 462(b) Registration Statement, if applicable, shall have
become effective, (ii) all required regulatory approvals have been obtained, and
(iii) you shall  have  entered  into one or more  underwriting  or  distribution
agreements  with  respect to the  Securities  then to be offered and the initial
public  offering price for each of such  Securities and the discounts  therefrom
and  commission  therefor  shall have been  determined in  accordance  with such
underwriting or distribution  agreements,  pursuant to the authorization of your
Board  of  Directors  and  the  applicable  order  of  the  Arizona  Corporation
Commission,  then,  when (i) the Securities  have been issued,  sold,  executed,
authenticated, and delivered, and (ii) the purchase price therefor has been paid
to you as  contemplated  in the  Registration  Statement  and  the  Rule  462(b)
Registration  Statement,  if applicable (including the Exhibits thereto), and in
any relevant  amendment  thereto or in any Rule 424 supplement to the prospectus
contained in the Registration  Statement;  the Securities will be validly issued
and will constitute legal,  valid, and binding  obligations of you except as the
same may be  limited  by (a)  general  principles  of equity  or by  bankruptcy,
insolvency, reorganization,  arrangement, moratorium, or other laws or equitable
principles  relating  to or  affecting  the  enforcement  of  creditors'  rights
generally,  or  by  equitable  principles  that  limit  the  right  to  specific
performance  or  otherwise  limit  remedial  action  or the  enforcement  of any
security provided for the Securities,  (b) the necessity for compliance with the
statutory  procedural  requirements  governing  the  exercise  of  remedies by a
secured creditor,  and (c) the qualification  that certain waivers,  procedures,
<PAGE>
remedies,  and other provisions of the Securities may be unenforceable  under or
limited by the law of the State of  Arizona;  however,  such law does not in our
opinion substantially prevent the practical realization of the benefits thereof.
In giving the above opinion, we have assumed that the law of the jurisdiction or
jurisdictions that govern the Securities is substantially the same as the law of
the State of Arizona.

     Consent  is  hereby  given  to the  use of  this  opinion  as  part  of the
Registration   Statement  and  the  Rule  462(b)  Registration   Statement,   if
applicable,  and to the use of our name wherever it appears in said Registration
Statement,  the related prospectus,  and the Rule 462(b) Registration Statement,
if applicable.

                                               Very truly yours,

                                               Snell & Wilmer L.L.P.

                                               Snell & Wilmer L.L.P.

                                  EXHIBIT 12.1


                         ARIZONA PUBLIC SERVICE COMPANY
                    COMPUTATION OF EARNINGS TO FIXED CHARGES
                             (THOUSANDS OF DOLLARS)

<TABLE>
<CAPTION>
                                        Nine Months
                                           Ended                           Twelve Months Ended
                                       --------------   --------------------------------------------------------
                                        September 30                           December 31
                                       --------------   --------------------------------------------------------
                                           1999           1998        1997        1996        1995        1994
                                           ----           ----        ----        ----        ----        ----
<S>                                      <C>            <C>         <C>         <C>         <C>         <C>
Earnings:
     Net Income......................       92,959(a)   $255,247    $251,493    $243,471    $239,570    $243,486
     Income taxes (1)................       48,065       159,456     153,324     132,961     141,267     177,244
     Fixed Charges...................      138,224       188,568     195,055     203,855     214,768     213,581
                                         ---------      --------    --------    --------    --------    --------
       Total.........................      279,248      $603,271    $599,872    $580,287    $595,605    $634,311
                                         =========      ========    ========    ========    ========    ========

Fixed Charges:
     Interest expense................      105,612      $144,695    $150,335    $158,287    $168,175    $166,045
     Amortization of debt discount,
       premium and expense...........        5,604         7,580       7,791       8,176       8,622       8,854
     Estimated interest portion of
       annual rents (2)..............       27,008        36,293      36,929      37,392      37,971      38,682
                                         ---------      --------    --------    --------    --------    --------
       Total.........................      138,224      $188,568    $195,055    $203,855    $214,768    $213,581
                                         =========      ========    ========    ========    ========    ========

Ratio of Earnings to Fixed Charges
     (rounded down)..................         2.02          3.19        3.07        2.84        2.77        2.96
                                         =========      ========    ========    ========    ========    ========

(1)  Income Taxes:
     Charged to operations...........      166,945      $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......................      (24,765)      (32,751)    (31,413)    (45,552)    (37,598)      9,042
                                         ---------      --------    --------    --------    --------    --------
       Total.........................       48,065      $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...............    $  25,384      $ 34,315    $ 34,720    $ 35,083    $ 35,422    $ 35,710
                                         =========      ========    ========    ========    ========    ========
</TABLE>

- ----------
(a)  Net   Income  for  nine   months   ended   September   1999   reflects   an
     after-tax extraordinary  charge   of   $140   million   for  a   regulatory
     disallowance.

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

INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Arizona Public Service Company on Form S-3 of our report dated March 4, 1999,
appearing in the Annual Report on Form 10-K of Arizona Public Service Company
for the year ended December 31, 1998 and to the reference to us under the
heading "Experts" in the Prospectus, which is part of this Registration
Statement.


DELOITTE & TOUCHE LLP


DELOITTE & TOUCHE LLP
Phoenix, Arizona

January 6, 2000

================================================================================
                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) [ ]

                                   ----------

                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)

New York                                                13-5160382
(State of incorporation                                 (I.R.S. employer
if not a U.S. national bank)                            identification no.)

One Wall Street, New York, N.Y.                         10286
(Address of principal executive offices)                (Zip code)

                                   ----------

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

Arizona                                                 86-0011170
(State or other jurisdiction of                         (I.R.S. employer
incorporation or organization)                          identification no.)

400 North Fifth Street
Phoenix, Arizona                                        85004
(Address of principal executive offices)                (Zip code)

                                   ----------

                              First Mortgage Bonds
                       (Title of the indenture securities)

================================================================================
<PAGE>
1. GENERAL INFORMATION. FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a) NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH IT
IS SUBJECT.

- --------------------------------------------------------------------------------
                Name                                   Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the       2 Rector Street, New York, N.Y. 10006,
     State of New York                    and Albany, N.Y. 12203

     Federal Reserve Bank of New York     33 Liberty Plaza, New York, N.Y. 10045

     Federal Deposit Insurance
     Corporation                          Washington, D.C.  20429

     New York Clearing House
     Association                          New York, New York   10005

     (b) WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2. AFFILIATIONS WITH OBLIGOR.

     IF  THE  OBLIGOR  IS AN  AFFILIATE  OF  THE  TRUSTEE,  DESCRIBE  EACH  SUCH
AFFILIATION.

     None.

16.  LIST OF EXHIBITS.

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION,  ARE
     INCORPORATED  HEREIN BY  REFERENCE AS AN EXHIBIT  HERETO,  PURSUANT TO RULE
     7A-29  UNDER THE TRUST  INDENTURE  ACT OF 1939  (THE  "ACT")  AND 17 C.F.R.
     229.10(D).

     1.   A copy  of  the  Organization  Certificate  of The  Bank  of New  York
          (formerly  Irving Trust Company) as now in effect,  which contains the
          authority  to  commence  business  and a grant of powers  to  exercise
          corporate  trust  powers.  (Exhibit 1 to  Amendment  No. 1 to Form T-1
          filed with Registration  Statement No. 33-6215,  Exhibits 1a and 1b to
          Form T-1 filed with Registration  Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

     6.   The  consent of the  Trustee  required  by Section  321(b) of the Act.
          (Exhibit  6  to  Form  T-1  filed  with  Registration   Statement  No.
          33-44051.)

     7.   A copy of the latest  report of  condition  of the  Trustee  published
          pursuant to law or to the requirements of its supervising or examining
          authority.

                                      -2-
<PAGE>
                                    SIGNATURE

     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation  organized  and existing  under the laws of the State of New York,
has duly caused this  statement of eligibility to be signed on its behalf by the
undersigned,  thereunto duly authorized,  all in The City of New York, and State
of New York, on the 21st day of December, 1999.


                                            THE BANK OF NEW YORK


                                            By: MICHAEL CULHANE
                                                --------------------------------
                                                Name: MICHAEL CULHANE
                                                Title: VICE PRESIDENT
<PAGE>
- --------------------------------------------------------------------------------
                       Consolidated Report of Condition of

                              THE BANK OF NEW YORK

                    of One Wall Street, New York, N.Y. 10286
                     And Foreign and Domestic Subsidiaries,

a member of the Federal Reserve System,  at the close of business  September 30,
1999,  published in accordance  with a call made by the Federal  Reserve Bank of
this District pursuant to the provisions of the Federal Reserve Act.

                                                                  Dollar Amounts
                                                                   In Thousands
                                                                   ------------
ASSETS
Cash and balances due from depository
  institutions:
   Noninterest-bearing balances and currency
     and coin ................................................     $  6,394,412
   Interest-bearing balances .................................        3,966,749
Securities:
   Held-to-maturity securities ...............................          805,227
   Available-for-sale securities .............................        4,152,260
Federal funds sold and Securities purchased under
   agreements to resell ......................................        1,449,439
Loans and lease financing receivables:
   Loans and leases, net of unearned income ........37,900,739
   LESS: Allowance for loan and lease losses .......   572,761
   LESS: Allocated transfer risk reserve ...........    11,754
   Loans and leases, net of unearned income,
     allowance, and reserve ..................................       37,316,224
Trading Assets ...............................................        1,646,634
Premises and fixed assets (including
  capitalized leases) ........................................          678,439
Other real estate owned ......................................           11,571
Investments in unconsolidated subsidiaries and
   associated companies ......................................          183,038
Customers' liability to this bank on acceptances
   outstanding ...............................................          349,282
Intangible assets ............................................          790,558
Other assets .................................................        2,498,658
                                                                   ------------
Total assets .................................................     $ 60,242,491
                                                                   ============
<PAGE>
LIABILITIES
Deposits:
   In domestic offices .......................................     $ 26,030,231
   Noninterest-bearing .............................11,348,986
   Interest-bearing ................................14,681,245
   In foreign offices, Edge and Agreement
     subsidiaries, and IBFs ..................................       18,530,950
   Noninterest-bearing .............................   156,624
   Interest-bearing ................................18,374,326
Federal funds purchased and Securities sold under
   agreements to repurchase ..................................        2,094,678
Demand notes issued to the U.S.Treasury ......................          232,459
Trading liabilities ..........................................        2,081,462
Other borrowed money:
   With remaining maturity of one year or less ...............          863,201
   With remaining maturity of more than one year
     through three years .....................................              449
   With remaining maturity of more than three years ..........           31,080
Bank's liability on acceptances executed and
  outstanding ................................................          351,286
Subordinated notes and debentures ............................        1,308,000
Other liabilities ............................................        3,055,031
                                                                   ------------
Total liabilities ............................................       54,578,827
                                                                   ============

EQUITY CAPITAL
Common stock .................................................        1,135,284
Surplus ......................................................          815,314
Undivided profits and capital reserves .......................        3,759,164
Net unrealized holding gains (losses) on
   available-for-sale securities .............................          (15,440)

Cumulative foreign currency translation adjustments ..........          (30,658)
                                                                   ------------
Total equity capital .........................................        5,663,664
                                                                   ------------
Total liabilities and equity capital .........................     $ 60,242,491
                                                                   ============
<PAGE>
     I,  Thomas  J.  Mastro,  Senior  Vice  President  and  Comptroller  of  the
above-named  bank do hereby  declare  that this  Report  of  Condition  has been
prepared in conformance with the  instructions  issued by the Board of Governors
of the  Federal  Reserve  System  and is true to the  best of my  knowledge  and
belief.

                                               Thomas J. Mastro


     We, the undersigned directors,  attest to the correctness of this Report of
Condition  and  declare  that it has been  examined by us and to the best of our
knowledge  and belief has been  prepared in  conformance  with the  instructions
issued by the Board of Governors of the Federal  Reserve  System and is true and
correct.

Thomas A. Reyni         ]
Alan R. Griffith        ]      Directors
Gerald L. Hassell       ]

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

================================================================================
                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) [ ]


                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)

New York                                               13-5160382
(State of incorporation                                (I.R.S. employer
if not a U.S. national bank)                           identification no.)

One Wall Street, New York, N.Y.                        10286
(Address of principal executive offices)               (Zip Code)


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


Arizona                                                86-0011170
(State or other jurisdiction of                        (I.R.S. employer
incorporation or organization)                         identification no.)

400 North Fifth Street                                 85004
Phoenix, Arizona                                       (Zip Code)
(Address of principal executive offices)

                                   ----------

                                 Debt Securities
                       (Title of the indenture securities)

================================================================================
<PAGE>
1. GENERAL INFORMATION. FURNISH THE FOLLOWING INFORMATION AS TO THE TRUSTEE:

     (a) NAME AND ADDRESS OF EACH EXAMINING OR SUPERVISING AUTHORITY TO WHICH IT
IS SUBJECT.

- --------------------------------------------------------------------------------
                Name                                   Address
- --------------------------------------------------------------------------------

     Superintendent of Banks of the       2 Rector Street, New York, N.Y. 10006,
     State of New York                    and Albany, N.Y. 12203

     Federal Reserve Bank of New York     33 Liberty Plaza, New York, N.Y. 10045

     Federal Deposit Insurance
     Corporation                          Washington, D.C.  20429

     New York Clearing House
     Association                          New York, New York   10005

     (b) WHETHER IT IS AUTHORIZED TO EXERCISE CORPORATE TRUST POWERS.

     Yes.

2. AFFILIATIONS WITH OBLIGOR.

     IF  THE  OBLIGOR  IS AN  AFFILIATE  OF  THE  TRUSTEE,  DESCRIBE  EACH  SUCH
AFFILIATION.

     None.

16. LIST OF EXHIBITS.

     EXHIBITS IDENTIFIED IN PARENTHESES BELOW, ON FILE WITH THE COMMISSION,  ARE
     INCORPORATED  HEREIN BY  REFERENCE AS AN EXHIBIT  HERETO,  PURSUANT TO RULE
     7A-29  UNDER THE TRUST  INDENTURE  ACT OF 1939  (THE  "ACT")  AND 17 C.F.R.
     229.10(D).

     1.   A copy  of  the  Organization  Certificate  of The  Bank  of New  York
          (formerly  Irving Trust Company) as now in effect,  which contains the
          authority  to  commence  business  and a grant of powers  to  exercise
          corporate  trust  powers.  (Exhibit 1 to  Amendment  No. 1 to Form T-1
          filed with Registration  Statement No. 33-6215,  Exhibits 1a and 1b to
          Form T-1 filed with Registration  Statement No. 33-21672 and Exhibit 1
          to Form T-1 filed with Registration Statement No. 33-29637.)

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)

     6.   The  consent of the  Trustee  required  by Section  321(b) of the Act.
          (Exhibit  6  to  Form  T-1  filed  with  Registration   Statement  No.
          33-44051.)

     7.   A copy of the latest  report of  condition  of the  Trustee  published
          pursuant to law or to the requirements of its supervising or examining
          authority.

                                      -2-
<PAGE>
                                    SIGNATURE

     Pursuant to the requirements of the Act, the Trustee, The Bank of New York,
a corporation  organized  and existing  under the laws of the State of New York,
has duly caused this  statement of eligibility to be signed on its behalf by the
undersigned,  thereunto duly authorized,  all in The City of New York, and State
of New York, on the 21st day of December, 1999.

                                            THE BANK OF NEW YORK


                                            By: MICHAEL CULHANE
                                                --------------------------------
                                                Name: MICHAEL CULHANE
                                                Title: VICE PRESIDENT
<PAGE>
- --------------------------------------------------------------------------------
                       Consolidated Report of Condition of

                              THE BANK OF NEW YORK

                    of One Wall Street, New York, N.Y. 10286
                     And Foreign and Domestic Subsidiaries,

a member of the Federal Reserve System,  at the close of business  September 30,
1999,  published in accordance  with a call made by the Federal  Reserve Bank of
this District pursuant to the provisions of the Federal Reserve Act.

                                                                  Dollar Amounts
                                                                   In Thousands
                                                                   ------------
ASSETS
Cash and balances due from depository
  institutions:
   Noninterest-bearing balances and currency
     and coin ................................................     $  6,394,412
   Interest-bearing balances .................................        3,966,749
Securities:
   Held-to-maturity securities ...............................          805,227
   Available-for-sale securities .............................        4,152,260
Federal funds sold and Securities purchased under
   agreements to resell ......................................        1,449,439
Loans and lease financing receivables:
   Loans and leases, net of unearned income ........37,900,739
   LESS: Allowance for loan and lease losses .......   572,761
   LESS: Allocated transfer risk reserve ...........    11,754
   Loans and leases, net of unearned income,
     allowance, and reserve ..................................       37,316,224
Trading Assets ...............................................        1,646,634
Premises and fixed assets (including
  capitalized leases) ........................................          678,439
Other real estate owned ......................................           11,571
Investments in unconsolidated subsidiaries and
   associated companies ......................................          183,038
Customers' liability to this bank on acceptances
   outstanding ...............................................          349,282
Intangible assets ............................................          790,558
Other assets .................................................        2,498,658
                                                                   ------------
Total assets .................................................     $ 60,242,491
                                                                   ============
<PAGE>
LIABILITIES
Deposits:
   In domestic offices .......................................     $ 26,030,231
   Noninterest-bearing .............................11,348,986
   Interest-bearing ................................14,681,245
   In foreign offices, Edge and Agreement
     subsidiaries, and IBFs ..................................       18,530,950
   Noninterest-bearing .............................   156,624
   Interest-bearing ................................18,374,326
Federal funds purchased and Securities sold under
   agreements to repurchase ..................................        2,094,678
Demand notes issued to the U.S.Treasury ......................          232,459
Trading liabilities ..........................................        2,081,462
Other borrowed money:
   With remaining maturity of one year or less ...............          863,201
   With remaining maturity of more than one year
     through three years .....................................              449
   With remaining maturity of more than three years ..........           31,080
Bank's liability on acceptances executed and
  outstanding ................................................          351,286
Subordinated notes and debentures ............................        1,308,000
Other liabilities ............................................        3,055,031
                                                                   ------------
Total liabilities ............................................       54,578,827
                                                                   ============

EQUITY CAPITAL
Common stock .................................................        1,135,284
Surplus ......................................................          815,314
Undivided profits and capital reserves .......................        3,759,164
Net unrealized holding gains (losses) on
   available-for-sale securities .............................          (15,440)

Cumulative foreign currency translation adjustments ..........          (30,658)
                                                                   ------------
Total equity capital .........................................        5,663,664
                                                                   ------------
Total liabilities and equity capital .........................     $ 60,242,491
                                                                   ============
<PAGE>
     I,  Thomas  J.  Mastro,  Senior  Vice  President  and  Comptroller  of  the
above-named  bank do hereby  declare  that this  Report  of  Condition  has been
prepared in conformance with the  instructions  issued by the Board of Governors
of the  Federal  Reserve  System  and is true to the  best of my  knowledge  and
belief.

                                               Thomas J. Mastro


     We, the undersigned directors,  attest to the correctness of this Report of
Condition  and  declare  that it has been  examined by us and to the best of our
knowledge  and belief has been  prepared in  conformance  with the  instructions
issued by the Board of Governors of the Federal  Reserve  System and is true and
correct.

Thomas A. Reyni         ]
Alan R. Griffith        ]      Directors
Gerald L. Hassell       ]

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

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                   ----------

                                    FORM T-1

                            STATEMENT OF ELIGIBILITY
                    UNDER THE TRUST INDENTURE ACT OF 1939 OF
                   A CORPORATION DESIGNATED TO ACT AS TRUSTEE

                                   ----------

               CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF
                A TRUSTEE PURSUANT TO SECTION 305(b)(2) ________

                                   ----------

                            THE CHASE MANHATTAN BANK
               (Exact name of trustee as specified in its charter)

NEW YORK                                                13-4994650
(State of incorporation                                 (I.R.S. employer
if not a national bank)                                 identification No.)

270 PARK AVENUE
NEW YORK, NEW YORK                                      10017
(Address of principal executive offices)                (Zip Code)

                               William H. McDavid
                                 General Counsel
                                 270 Park Avenue
                            New York, New York 10017
                               Tel: (212) 270-2611
            (Name, address and telephone number of agent for service)

                                   ----------

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

ARIZONA                                                 86-0011170
(State or other jurisdiction of                         (I.R.S. employer
incorporation or organization)                          identification No.)

400 NORTH FIFTH STREET
PHOENIX, ARIZONA 85004                                  85005
(Address of principal executive offices)                (Zip Code)

                                   ----------
                                 DEBT SECURITIES
                       (Title of the indenture securities)
                                   ----------
<PAGE>
                                     GENERAL

ITEM 1. GENERAL INFORMATION.

     Furnish the following information as to the trustee:

     (a) Name and address of each examining or supervising authority to which it
is subject.

     New York State Banking Department, State House, Albany, New York 12110.

     Board of Governors of the Federal Reserve System, Washington, D.C., 20551

     Federal Reserve Bank of New York,  District No. 2, 33 Liberty  Street,  New
York, N.Y.

     Federal Deposit Insurance Corporation, Washington, D.C., 20429.

     (b) Whether it is authorized to exercise corporate trust powers.

     Yes.

ITEM 2. AFFILIATIONS WITH THE OBLIGOR.

     If  the  obligor  is an  affiliate  of  the  trustee,  describe  each  such
affiliation.

     None.

                                      - 2 -
<PAGE>
ITEM 16. LIST OF EXHIBITS

     List below all exhibits filed as a part of this Statement of Eligibility.

     1. A copy of the Articles of  Association  of the Trustee as now in effect,
including the  Organization  Certificate and the Certificates of Amendment dated
February 17,  1969,  August 31,  1977,  December  31,  1980,  September 9, 1982,
February 28, 1985, December 2, 1991 and July 10, 1996 (see Exhibit 1 to Form T-1
filed  in  connection  with  Registration  Statement  No.  333-06249,  which  is
incorporated by reference).

     2. A copy of the  Certificate  of  Authority  of the  Trustee  to  Commence
Business  (see  Exhibit  2 to Form T-1  filed in  connection  with  Registration
Statement No. 33-50010, which is incorporated by reference. On July 14, 1996, in
connection  with the  merger  of  Chemical  Bank and The  Chase  Manhattan  Bank
(National  Association),  Chemical Bank, the surviving corporation,  was renamed
The Chase Manhattan Bank).

     3. None,  authorization to exercise  corporate trust powers being contained
in the documents identified above as Exhibits 1 and 2.

     4. A copy of the existing By-Laws of the Trustee (see Exhibit 4 to Form T-1
filed  in  connection  with  Registration  Statement  No.  333-76439,  which  is
incorporated by reference).

     5. Not applicable.

     6. The  consent of the Trustee  required by Section  321(b) of the Act (see
Exhibit  6 to Form T-1  filed in  connection  with  Registration  Statement  No.
33-50010,  which is incorporated  by reference.  On July 14, 1996, in connection
with  the  merger  of  Chemical  Bank and The  Chase  Manhattan  Bank  (National
Association),  Chemical Bank, the surviving  corporation,  was renamed The Chase
Manhattan Bank).

     7. A copy of the  latest  report of  condition  of the  Trustee,  published
pursuant to law or the requirements of its supervising or examining authority.

     8. Not applicable.

     9. Not applicable.

                                   SIGNATURE

     Pursuant  to the  requirements  of the  Trust  Indenture  Act of  1939  the
Trustee,  The Chase Manhattan  Bank, a corporation  organized and existing under
the laws of the State of New York, has duly caused this statement of eligibility
to be signed on its behalf by the undersigned, thereunto duly authorized, all in
the City of New York and State of New York, on the 20TH day of DECEMBER, 1999.

                                        THE CHASE MANHATTAN BANK

                                         By T. J. Foley
                                            -------------------------
                                            T.J. Foley
                                            Vice President

                                      - 3 -
<PAGE>
                              Exhibit 7 to Form T-1


                                Bank Call Notice

                             RESERVE DISTRICT NO. 2
                       CONSOLIDATED REPORT OF CONDITION OF

                            The Chase Manhattan Bank
                  of 270 Park Avenue, New York, New York 10017
                     and Foreign and Domestic Subsidiaries,
                     a member of the Federal Reserve System,

                     at the close of business September 30,
               1999, in accordance with a call made by the Federal
                  Reserve Bank of this District pursuant to the
                     provisions of the Federal Reserve Act.


                                                                  Dollar Amounts
ASSETS                                                              In Millions

Cash and balances due from depository institutions:
     Noninterest-bearing balances and currency and coin .........     $  13,497
     Interest-bearing balances ..................................         6,388
Securities:
Held to maturity securities .....................................           798
Available for sale securities ...................................        48,655
Federal funds sold and securities purchased under
     agreements to resell .......................................        30,373
Loans and lease financing receivables:
     Loans and leases, net of unearned income ......... $ 132,392
     Less: Allowance for loan and lease losses ........     2,463
     Less: Allocated transfer risk reserve ............         0
                                                        ---------
     Loans and leases, net of unearned income,
     allowance, and reserve .....................................       129,929
Trading Assets ..................................................        47,413
Premises and fixed assets (including capitalized leases) ........         3,287
Other real estate owned .........................................            26
Investments in unconsolidated subsidiaries and
     associated companies .......................................           185
Customers' liability to this bank on acceptances
     outstanding ................................................           716
Intangible assets ...............................................         2,693
Other assets ....................................................        15,430
                                                                      ---------
TOTAL ASSETS ....................................................     $ 299,390
                                                                      =========

                                      -4-
<PAGE>
                                   LIABILITIES

Deposits
     In domestic offices ........................................     $ 100,324
     Noninterest-bearing .............................. $  41,601
     Interest-bearing .................................    58,723
                                                        ---------
     In foreign offices, Edge and Agreement
     subsidiaries and IBF's .....................................        88,064
Noninterest-bearing ................................... $   6,363
     Interest-bearing .................................    81,701

Federal funds purchased and securities sold under
  agreements to repurchase ......................................        35,773
Demand notes issued to the U.S. Treasury ........................           892
Trading liabilities .............................................        33,565
Other borrowed money (includes mortgage indebtedness
     and obligations under capitalized leases):
     With a remaining maturity of one year or less ..............         4,434
       With a remaining maturity of more than one year
            through three years .................................            14
       With a remaining maturity of more than three years .......            97
Bank's liability on acceptances executed and outstanding ........           716
Subordinated notes and debentures ...............................         5,429
Other liabilities ...............................................        11,457

TOTAL LIABILITIES ...............................................       280,765
                                                                      ---------

                                 EQUITY CAPITAL

Perpetual preferred stock and related surplus ...................             0
Common stock ....................................................         1,211
Surplus (exclude all surplus related to preferred stock) ........        11,016
Undivided profits and capital reserves ..........................         7,333
Net unrealized holding gains (losses)
on available-for-sale securities ................................          (951)
Accumulated net gains (losses) on cash flow hedges ..............             0
Cumulative foreign currency translation adjustments .............            16
TOTAL EQUITY CAPITAL ............................................        18,625
                                                                      ---------
TOTAL LIABILITIES AND EQUITY CAPITAL ............................     $ 299,390
                                                                      =========

     I, Joseph L.  Sclafani,  E.V.P.  & Controller of the  above-named  bank, do
hereby  declare that this Report of Condition has been  prepared in  conformance
with the instructions issued by the appropriate Federal regulatory authority and
is true to the best of my knowledge and belief.

                                         JOSEPH L. SCLAFANI

     We, the undersigned directors,  attest to the correctness of this Report of
Condition  and declare  that it has been  examined by us, and to the best of our
knowledge  and belief has been  prepared in  conformance  with the  instructions
issued by the appropriate Federal regulatory authority and is true and correct.

                                         WALTER V. SHIPLEY         )
                                         WILLIAM B. HARRISON, JR.  )  DIRECTORS
                                         SUSAN V. BERRESFORD       )

                                      -5-


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