Filed Pursuant to Rule 424(b)(5)
                                                   Registration Number 333-63994


Prospectus Supplement
(To Prospectus dated July 11, 2001)

[LOGO]

ARIZONA PUBLIC SERVICE COMPANY

$400,000,000

6.375% NOTES DUE 2011

INTEREST PAYABLE APRIL 15 AND OCTOBER 15

ISSUE PRICE: 99.668%

We will pay interest on the notes each April 15 and October 15. We will make the
first interest payment on April 15, 2002. We may redeem the notes at any time if
we pay a "make-whole premium." There is no sinking fund for the notes.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus supplement or the related prospectus is truthful or complete. Any
representation to the contrary is a criminal offense.

--------------------------------------------------------------------------------
                                             UNDERWRITING
                              PRICE TO       DISCOUNTS AND       PROCEEDS
                               PUBLIC         COMMISSIONS          TO US
--------------------------------------------------------------------------------
Per Note                       99.668%             0.650%           99.018%
Total                    $398,672,000         $2,600,000      $396,072,000
--------------------------------------------------------------------------------

We do not intend to list the notes on any securities exchange or quotation
system. Currently there is no public market for the notes.

We expect that the delivery of the notes will be made to investors through the
book-entry delivery system of The Depository Trust Company on or about October
5, 2001.

                                JOINT BOOKRUNNERS

CREDIT SUISSE FIRST BOSTON                                              JPMORGAN

BANC OF AMERICA SECURITIES LLC

                    SALOMON SMITH BARNEY

                                   BANC ONE CAPITAL MARKETS, INC.

                                                                BARCLAYS CAPITAL

October 2, 2001.

You should rely only on the information contained or incorporated by reference
in this prospectus supplement or to which we have referred you in the
accompanying prospectus. We have not authorized anyone to provide you with
information that is different. This document may only be used where it is legal
to sell these securities. The information in this document is only accurate as
of the date of this document.

                                TABLE OF CONTENTS

                              PROSPECTUS SUPPLEMENT

                                                                            Page
                                                                            ----
Arizona Public Service Company...............................................S-3
Use of Proceeds..............................................................S-4
Ratio of Earnings to Fixed Charges...........................................S-4
Description of the Notes.....................................................S-5
Underwriting.................................................................S-8
Notice to Canadian Residents.................................................S-9

                                   PROSPECTUS

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.............................................................17
Regarding the Trustee.........................................................18
Plan of Distribution..........................................................18
Experts.......................................................................19
Legal Opinion.................................................................19

                                       S-2

                         ARIZONA PUBLIC SERVICE COMPANY

We were incorporated in 1920 under the laws of Arizona and are a wholly-owned
subsidiary of Pinnacle West Capital Corporation ("Pinnacle West"). We are
Arizona's largest electric utility, with more than 850,000 customers. We provide
wholesale or retail electric service to the entire state of Arizona, with the
exception of Tucson and about one-half of the Phoenix area. We also generate
and, directly or through Pinnacle West's power marketing division, sell and
deliver electricity to wholesale customers in the western United States. Our
principal executive offices are located at 400 North Fifth Street, Phoenix,
Arizona 85004, 602-250-1000.

In 1999, we entered into a Settlement Agreement with various parties related to
the implementation of retail electric competition in Arizona. As authorized by
the Settlement Agreement, we intend to move substantially all of our generation
assets to Pinnacle West Energy Corporation, which is also a wholly-owned
subsidiary of Pinnacle West, prior to the end of 2002. Following its receipt of
these generation assets, Pinnacle West Energy expects to sell its power at
wholesale to Pinnacle West's power marketing division, which, in turn, is
expected to sell power to us and to non-affiliated power purchasers. We plan to
meet at least fifty percent of our energy needs under a long-term power purchase
agreement with Pinnacle West's power marketing division, with the balance of
these needs being met through a competitive bid process in which Pinnacle West's
power marketing division may participate.

                                       S-3

                                 USE OF PROCEEDS


We will use the net proceeds from the sale of the notes to:

*    Repay at maturity $250 million of Floating Rate Notes due November 15, 2001
     currently bearing interest at an average interest rate of 4.65%; and

*    Repay short-term borrowings (with an estimated average interest rate of
     approximately 3%) incurred:

     *    For an open market purchase in February 2001 of $13 million of our
          First Mortgage Bonds, 7.25% Series due April 1, 2023;

     *    To redeem $45 million of our First Mortgage Bonds, 9.5% Series due
          April 15, 2021, called on April 30, 2001; and

     *    To redeem $72.375 million of our First Mortgage Bonds, 9.0% Series due
          December 15, 2021, on December 17, 2001.

Until we are able to use the proceeds for these purposes, we will invest the
proceeds temporarily in U.S. Government or agency obligations, commercial paper,
bank certificates of deposit, or repurchase agreements collateralized by U.S.
Government or agency obligations, or deposit the proceeds with banks.

                       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(a):

     SIX MONTHS
       ENDED                                  TWELVE MONTHS ENDED
      JUNE 30,                                    DECEMBER 31,
     ----------                    ----------------------------------------
        2001                       2000     1999     1998     1997     1996
        ----                       ----     ----     ----     ----     ----
        3.62                       3.79     3.24     3.11     3.01     2.75

For the purposes of computing our ratios of earnings to fixed charges, earnings
are divided by fixed charges. "Earnings" represent the aggregate of income
(loss) from continuing operations before income taxes and fixed charges. "Fixed
charges" represent interest expense, the amortization of debt discount and the
interest portion of rentals.

----------
(a)  We have reclassified certain prior year amounts to conform to the current
     year presentation.

                                       S-4

                            DESCRIPTION OF THE NOTES

WE WILL ISSUE THE NOTES AS A SEPARATE SERIES OF DEBT SECURITIES UNDER THE
INDENTURE DATED AS OF JANUARY 15, 1998, BETWEEN US AND THE CHASE MANHATTAN BANK,
AS TRUSTEE. BECAUSE THIS IS A SUMMARY, IT DOES NOT CONTAIN ALL THE INFORMATION
THAT MAY BE IMPORTANT TO YOU. THE FOLLOWING DESCRIPTION OF SPECIFIC TERMS OF THE
NOTES SUPPLEMENTS THE DESCRIPTION OF THE GENERAL TERMS AND PROVISIONS OF THE
DEBT SECURITIES IN THE PROSPECTUS UNDER "DESCRIPTION OF DEBT SECURITIES."

GENERAL

The specific financial and legal terms of the notes are set forth below:

*    TITLE: 6.375% Notes Due 2011

*    TOTAL PRINCIPAL AMOUNT BEING ISSUED: $400,000,000

*    DUE DATE FOR PRINCIPAL: October 15, 2011

*    INTEREST RATE: 6.375%

*    DATE INTEREST STARTS ACCRUING: October 5, 2001

*    INTEREST DUE DATES: April 15 and October 15

*    FIRST INTEREST DUE DATE: April 15, 2002

*    REGULAR RECORD DATES FOR INTEREST DUE DATES: April 1 for April 15 interest
     due date; October 1 for October 15 interest due date

*    COMPUTATION OF INTEREST: on the basis of a 360-day year of twelve 30-day
     months

*    FORM OF NOTES: A Global Security will initially represent the notes. We
     will deposit the Global Security with or on behalf of The Depository Trust
     Company ("DTC"). See "Global Securities" in the prospectus. We may allow
     exchange of the Global Security for registered notes and transfer of the
     Global Security to a person other than DTC in additional circumstances that
     we agree to other than those described under that heading.

*    SINKING FUND: The notes will not be subject to any sinking fund.

The notes will constitute a series of our unsecured senior Debt Securities. The
notes will rank equally with all of our existing and future senior unsecured
debt and senior to all of our existing and future subordinated debt and will be
effectively subordinated to all of our secured debt. As of June 30, 2001, we had
$752 million of outstanding secured debt. The notes will not have the benefit of
the collateral that secures our First Mortgage Bonds. The prospectus that
accompanies this prospectus supplement describes our Debt Securities and our
First Mortgage Bonds under "Description of Debt Securities" and "Description of
First Mortgage Bonds," respectively.

FURTHER ISSUES

We may from time to time, without notice to, or the consent of, the then
existing registered holders of the notes, create and issue further notes equal
in rank and having the same maturity, payment terms, redemption features, and
other terms, except for the payment of interest accruing prior to the issue date
of the further notes and for the first payment of interest following the issue
date of the further notes, as the notes offered by this prospectus supplement.
These further notes may be consolidated and form a single series with the notes
offered by this prospectus supplement.

                                       S-5

REDEMPTION

We may redeem all or part of the notes at any time at our option at a redemption
price equal to the greater of (1) the principal amount of the notes being
redeemed plus accrued interest to the redemption date or (2) the Make-Whole
Amount for the notes being redeemed.

As used herein:

"MAKE-WHOLE AMOUNT" means the sum, as determined by a Quotation Agent, of the
present values of the principal amount of the notes to be redeemed, together
with scheduled payments of interest (exclusive of interest to the redemption
date) from the redemption date to the maturity date of the notes, in each case
discounted to the redemption date on a semi-annual basis, assuming a 360-day
year consisting of twelve 30-day months, at the Adjusted Treasury Rate, plus
accrued interest on the principal amount of the notes being redeemed to the
redemption date.

"ADJUSTED TREASURY RATE" means, with respect to any redemption date, (i) the
yield, under the heading which represents the average for the immediately
preceding week, appearing in the most recently published statistical release
designated "H.15 (519)" or any successor publication which is published weekly
by the Board of Governors of the Federal Reserve System and which establishes
yields on actively traded United States Treasury securities adjusted to constant
maturity under the caption "Treasury Constant Maturities," for the maturity
corresponding to the Comparable Treasury Issue (if no maturity is within three
months before or after the remaining term of the notes, yields for the two
published maturities most closely corresponding to the Comparable Treasury Issue
shall be determined and the Adjusted Treasury Rate shall be interpolated or
extrapolated from such yields on a straight line basis, rounding to the nearest
month) or (ii) if such release (or any successor release) is not published
during the week preceding the calculation date or does not contain such yields,
the rate per year equal to the semi-annual equivalent yield to maturity of the
Comparable Treasury Issue, calculated using a price for the Comparable Treasury
Issue (expressed as a percentage of its principal amount) equal to the
Comparable Treasury Price for such redemption date, in each case calculated on
the third business day preceding the redemption date, plus in each case 0.25%.

"COMPARABLE TREASURY ISSUE" means the United States Treasury security selected
by the Quotation Agent as having a maturity comparable to the remaining term
from the redemption date to the maturity date of the notes that would be
utilized, at the time of selection and in accordance with customary financial
practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the notes.

"QUOTATION AGENT" means the Reference Treasury Dealer selected by the trustee
after consultation with us.

"REFERENCE TREASURY DEALER" means a primary U.S. Government securities dealer
selected by us.

"COMPARABLE TREASURY PRICE" means, with respect to any redemption date, if
clause (ii) of the definition of Adjusted Treasury Rate is applicable, the
average of three, or such lesser number as is obtained by the trustee, Reference
Treasury Dealer Quotations for such redemption date.

"REFERENCE TREASURY DEALER QUOTATIONS" means, with respect to each Reference
Treasury Dealer and any redemption date, the average, as determined by the
trustee, of the bid and asked prices for the Comparable Treasury Issue,
expressed in each case as a percentage of its principal amount, quoted in
writing to the trustee by such Reference Treasury Dealer at 5:00 p.m., New York
City time, on the third business day preceding such redemption date.

If we elect to redeem all or any part of the notes, we will give notice of
redemption to holders of the notes. We will give notice of a redemption at least
30 days before the redemption date. However, we will not know the exact
redemption price until three business days before the redemption date.
Therefore, the notice of redemption will only describe how the redemption price
will be calculated. On the redemption date, if we have paid the full redemption
price to the trustee, notes called for redemption will cease to bear interest
and the holders of such notes will only have a right to receive payment of the
redemption price.

                                       S-6

DEFEASANCE

The provisions described in the prospectus under the caption "Description of
Debt Securities -- Defeasance and Covenant Defeasance" are applicable to the
notes.

REGARDING THE TRUSTEE

The Chase Manhattan Bank is the trustee under the indenture relating to the
notes. 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 $34.4 million under a revolving credit
     agreement, none of which was outstanding as of June 30, 2001.

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.

                                       S-7

                                  UNDERWRITING

Under the terms and subject to the conditions contained in an underwriting
agreement dated October 2, 2001, we have agreed to sell to the underwriters
named below, for whom Credit Suisse First Boston Corporation and J.P. Morgan
Securities Inc. are acting as representatives, the following respective
principal amounts of the notes:

                         Underwriter                           Principal Amount
                         -----------                           ----------------
Credit Suisse First Boston Corporation .....................     $130,000,000
J.P. Morgan Securities Inc. ................................      130,000,000
Banc of America Securities LLC .............................       50,000,000
Salomon Smith Barney Inc. ..................................       50,000,000
Banc One Capital Markets, Inc. .............................       20,000,000
Barclays Capital, Inc. .....................................       20,000,000
                                                                 ------------
     Total..................................................     $400,000,000
                                                                 ============

The underwriting agreement provides that the underwriters are obligated to
purchase all of the notes if any are purchased. The underwriting agreement
provides that if an underwriter defaults, the purchase commitments of
non-defaulting underwriters may be increased or the offering of notes may be
terminated.

The underwriters propose to offer the notes initially to the public at the
public offering price set forth on the cover page of this prospectus supplement
and to selling group members at that price less a concession of 0.400% of the
principal amount per note. The underwriters and selling group members may allow
a discount of 0.250% of such principal amount per note on sales to other
broker/dealers. After the initial public offering, the underwriters may change
the public offering price and concession and discount to broker/dealers.

J.P. Morgan Securities Inc. ("JPMorgan") and Credit Suisse First Boston
Corporation ("CSFB") will make the securities available for distribution on the
Internet through a proprietary Web site and/or a third-party system operated by
Market Axess Inc., an Internet-based communications technology provider. Market
Axess Inc. is providing the system as a conduit for communications between
JPMorgan, CSFB and their respective customers and is not a party to any
transactions. Market Axess Inc., a registered broker-dealer, will receive
compensation from JPMorgan and CSFB based on transactions that each conducts
through the system. JPMorgan and CSFB will make the securities available to
their respective customers through the Internet distributions, whether made
through a proprietary or third-party system, on the same terms as distributions
made through other channels.

The following table summarizes the underwriting discounts and commissions we
will pay to the underwriters:

                                                          Per Note       Total
                                                          --------    ----------
Underwriting discounts and commissions payable by us....   0.650%     $2,600,000

Expenses associated with this offering payable by us are estimated to be
$325,000.

The notes are a new issue of securities with no established trading market. We
do not intend to apply for the notes to be listed on any securities exchange or
to be quoted on any quotation system. One or more of the underwriters intend to
make a secondary market for the notes. However, they are not obligated to do so
and may discontinue making a secondary market at any time without notice. No
assurance can be given as to how liquid the trading market for the notes will
be.

We have agreed to indemnify the underwriters against liabilities under the
Securities Act of 1933, or contribute to payments which the underwriters may be
required to make in that respect.

In connection with the offering the underwriters may engage in over-allotment
transactions, stabilizing transactions, syndicate covering transactions and
penalty bids in accordance with Regulation M under the Securities Exchange Act
of 1934.

                                       S-8

*    Over-allotment involves sales by the underwriters of notes in excess of the
     principal amount of the notes the underwriters are obligated to purchase,
     which creates a syndicate short position.

*    Stabilizing transactions permit bids to purchase the underlying security so
     long as the stabilizing bids do not exceed a specified maximum.

*    Syndicate covering transactions involve purchases of the notes in the open
     market after the distribution has been completed in order to cover
     syndicate short positions.

*    Penalty bids permit the underwriters to reclaim a selling concession from a
     syndicate member when the notes originally sold by such syndicate member
     are purchased in a stabilizing transaction or a syndicate covering
     transaction to cover syndicate short positions.

These stabilizing transactions, syndicate covering transactions and penalty bids
may have the effect of raising or maintaining the market price of the notes or
preventing or retarding a decline in the market price of the notes. As a result,
the price of the notes may be higher than the price that might otherwise exist
in the open market. These transactions, if commenced, may be discontinued at any
time.

The underwriters and their affiliates engage in transactions with us, our
affiliates and our parent or perform services for us, our affiliates and our
parent in the ordinary course of business. Those transactions and services
include investment banking and commercial banking services, and serving as an
agent and/or lender on some of our credit agreements. The underwriters and their
affiliates received customary fees for these transactions and services. In this
regard, banking affiliates of each of J.P. Morgan Securities Inc., Banc of
America Securities LLC, Salomon Smith Barney Inc., Banc One Capital Markets,
Inc., and Barclays Capital, Inc., are lenders to us. In addition, Credit Suisse
First Boston Corporation and Banc of America Securities LLC are dealers under
our commercial paper program, and J.P. Morgan Securities Inc., Banc One Capital
Markets, Inc. and an affiliate of Salomon Smith Barney Inc. are remarketing
agents for certain series of pollution control bonds for which we are liable.
Banc One Capital Markets, Inc. is also currently acting as a pension trustee. An
affiliate of Banc of America Securities LLC 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. In addition, The Chase Manhattan Bank, the trustee
under the indenture, is an affiliate of J.P. Morgan Securities Inc. J.P. Morgan
Securities Inc., Barclays Capital, Inc., or affiliates of those companies
provide investment management services to Pinnacle West and affiliated
companies.

                          NOTICE TO CANADIAN RESIDENTS

RESALE RESTRICTIONS

The distribution of the notes in Canada is being made only on a private
placement basis exempt from the requirement that we prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of the notes are made. Any resale of the notes in Canada must be made
under applicable securities laws, which will vary depending on the relevant
jurisdiction, and which may require resales to be made under available statutory
exemptions or under a discretionary exemption granted by the applicable
provincial securities regulatory authority. Purchasers are advised to seek legal
advice prior to any resale of the notes.

REPRESENTATIONS OF PURCHASERS

By purchasing the notes in Canada and accepting a purchase confirmation a
purchaser is representing to us and the dealer from whom the purchase
confirmation is received that the purchaser is entitled under applicable
provincial securities laws to purchase the notes without the benefit of a
prospectus qualified under those securities laws, where required by law, that
the purchaser is purchasing as principal and not as agent, and the purchaser has
reviewed the text above under Resale Restrictions.

                                       S-9

RIGHTS OF ACTION (ONTARIO PURCHASERS)

The notes being offered are those of a foreign issuer and Ontario purchasers
will not receive the contractual right of action prescribed by Ontario
securities law. As a result, Ontario purchasers must rely on other remedies that
may be available, including common law rights of action for damages or
rescission or rights of action under the civil liability provisions of the U.S.
federal securities laws.

ENFORCEMENT OF LEGAL RIGHTS

All of the issuer's directors and officers as well as the experts named herein
may be located outside of Canada and, as a result, it may not be possible for
Canadian purchasers to effect service of process within Canada upon the issuer
or such persons. All or a substantial portion of the assets of the issuer and
such persons may be located outside of Canada and, as a result, it may not be
possible to satisfy a judgment against the issuer or such persons in Canada or
to enforce a judgement obtained in Canadian courts against such issuer or
persons outside of Canada.

TAXATION AND ELIGIBILITY FOR INVESTMENT

Canadian purchasers of the notes should consult their own legal and tax advisors
with respect to the tax consequences of an investment in the notes in their
particular circumstances and about the eligibility of the notes for investment
by the purchaser under relevant Canadian legislation.

                                      S-10

Prospectus

                         ARIZONA PUBLIC SERVICE COMPANY
                                  $725,000,000
                              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 July 11, 2001

                                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..........................................................  17
Regarding the Trustees.....................................................  18
Plan of Distribution.......................................................  18
Experts....................................................................  19
Legal Opinions.............................................................  19

                                       2

                              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 and legislative proceedings relating to the
          restructuring;

     *    regional economic and market conditions, including the California
          energy situation, which could affect customer growth and the cost of
          power supplies;

     *    the cost of debt and equity capital;

     *    weather variations affecting local and regional customer energy usage;

     *    conservation programs;

     *    our ability to compete successfully outside traditional regulated
          markets (including the wholesale market);

     *    technological developments in the electric industry; 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. We claim the protection of the safe harbor for forward-looking
statements contained in the Private Securities Litigation Reform Act of 1995 for
any forward-looking statements contained in this prospectus and any prospectus
supplement.

                                       3

                       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.

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,
          2000;

     *    Quarterly Report on Form 10-Q for the fiscal quarter ended March 31,
          2001; and

     *    Current Reports on Form 8-K dated November 27, 2000, and April 5,
          2001.

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 9046
          P.O. Box 53999
          Phoenix, Arizona 85072-3999
          (602) 250-5608

                                       4

                   BUSINESS OF ARIZONA PUBLIC SERVICE COMPANY

     We were incorporated in 1920 under the laws of Arizona and we are Arizona's
largest electric utility, with more than 850,000 customers. We provide wholesale
or retail electric service to the entire state of Arizona, with the exception of
Tucson and about one-half of the Phoenix area. We also generate and, directly or
through Pinnacle West Capital Corporation's power marketing division, sell and
deliver electricity to wholesale customers in the western United States. 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:

Three Months Ended                        Twelve Months Ended
     March 31,                                 December 31,
     ---------              -----------------------------------------------
       2001                 2000       1999       1998       1997      1996
       ----                 ----       ----       ----       ----      ----
       3.55                 3.88     2.05(a)      3.19       3.07      2.84

     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.

----------
(a) The ratio for twelve months ended December 1999 reflects an extraordinary
charge of $140 million for a regulatory disallowance. The ratio would be 3.32
without consideration of the extraordinary charge.

                                 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;

                                       5

     *    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;

     *    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 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

                                       6

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 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 encumbered property 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.

                                       7

     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.

     As of March 31, 2001, we estimate that the Mortgage would have allowed us
to issue up to approximately $2.77 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 2000, our replacement
fund requirement was about $149 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 events of default 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.

                                       8

MODIFICATION OF THE MORTGAGE

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

     *    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. You should read the Indentures in their entirety,
including the definitions of certain terms, together with this prospectus and
the prospectus supplement before you make any investment decision. Although
separate

                                       9

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:

     *    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.

                                       10

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.

     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.

                                       11

     The Indenture does not limit the aggregate amount of senior debt that we
may issue. As of March 31, 2001, there was approximately $1.57 billion of senior
debt outstanding and there was no subordinated debt outstanding.

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, 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 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 security that remains unclaimed at the end of
two years after the principal, premium, or interest

                                       12

has become due and payable will be repaid to us, and the holder of the debt
security may look only to us for payment.

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

                                       13

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 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

     *    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

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.

                                       16

                                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 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

                                       17

account of, beneficial interests in a global security, or for maintaining,
supervising, or reviewing any records relating to the beneficial interests.

                             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 $15.6 million commitment by The Bank of New York pursuant to a
          revolving credit agreement, none of which was outstanding at March 31,
          2001.

     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 $34.4 million under a revolving
          credit agreement, none of which was outstanding as of March 31, 2001.

     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 $725,000,000 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

     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' 2000 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.

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