FORM 10-Q
                       Securities and Exchange Commission
                             Washington, D.C. 20549

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934

For the quarterly period ended      March 31, 1998
                              --------------------------

                                       OR

[ ]  TRANSITION  REPORT  PURSUANT  TO  SECTION  13 OR  15(d)  OF THE  SECURITIES
     EXCHANGE ACT OF 1934

For the transition period from                  to
                              ------------------  ------------------

Commission file number    1-4473
                      --------------

                         ARIZONA PUBLIC SERVICE COMPANY
             ------------------------------------------------------
             (Exact name of registrant 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, P.O. Box 53999, Phoenix, Arizona         85072-3999
- --------------------------------------------------------         ----------
         (Address of principal executive offices)                (Zip Code)

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


   --------------------------------------------------------------------------
   (Former name, former address and former fiscal year, if changed since last
                                     report)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                               Yes   X   No      
                                   -----    -----

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest practicable date.

               Number of shares of common stock, $2.50 par value,
               outstanding as of May 15, 1998: 71,264,947

                                    Glossary
                                    --------

ACC - Arizona Corporation Commission

ACC Staff - Staff of the Arizona Corporation Commission

Cholla - Cholla Power Plant

Company - Arizona Public Service Company

EITF - Emerging Issues Task Force

EITF 97-4 - Emerging  Issues Task Force  Issue No.  97-4,  "Deregulation  of the
Pricing of Electricity --- Issues Related to the Applications of FASB Statements
No. 71, Accounting for the Effects of Certain Types of Regulation,  and No. 101,
Regulated  Enterprises --- Accounting for the  Discontinuation of Application of
FASB Statement No. 71"

EPA - United States Environmental Protection Agency

FERC - Federal Energy Regulatory Commission

Four Corners - Four Corners Power Plant

ITC - Investment tax credit

1997 10-K - Arizona  Public  Service  Company Annual Report on Form 10-K for the
fiscal year ended December 31, 1997

NGS - Navajo Generating Station

Palo Verde - Palo Verde Nuclear Generating Station

Pinnacle West - Pinnacle West Capital Corporation

Power Coordination Agreement - 1955 agreement between the Company and Salt River
Project that provides for certain electric system and power sales

Rules  - Rules  adopted  by the ACC for  the  introduction  of  retail  electric
competition in Arizona

SFAS No. 71 - Statement of Financial  Accounting  Standards No. 71,  "Accounting
for the Effects of Certain Types of Regulation"

SFAS No. 130 - Statement of Financial  Accounting  Standards No. 130, "Reporting
Comprehensive Income"

SFAS No. 131 - Statement of Financial Accounting Standards No. 131, "Disclosures
about Segments of an Enterprise and Related Information"

SFAS No. 132 - Statement of Financial  Accounting Standards No. 132, "Employers'
Disclosures about Pensions and Other Postretirement Benefits"

Salt  River  Project - Salt River  Project  Agricultural  Improvement  and Power
District

Territorial  Agreement  - 1955  agreement  between  the  Company  and Salt River
Project that has provided  exclusive  retail  service  territories in Arizona as
against each other

                                       -2-

                         PART I - FINANCIAL INFORMATION
                         ------------------------------

Item 1. Financial Statements
- ----------------------------

                         ARIZONA PUBLIC SERVICE COMPANY
                         CONDENSED STATEMENTS OF INCOME
                         ------------------------------
                                   (Unaudited)
                                                              Three Months
                                                             Ended March 31,
                                                         ----------------------
                                                            1998         1997
                                                         ---------    ---------
                                                         (Thousands of Dollars)

ELECTRIC OPERATING REVENUES ..........................   $ 380,423    $ 379,021
                                                         ---------    ---------

FUEL EXPENSES:
  Fuel for electric generation .......................      50,328       51,122
  Purchased power ....................................      23,589       34,347
                                                         ---------    ---------
     Total ...........................................      73,917       85,469
                                                         ---------    ---------
OPERATING REVENUES LESS FUEL EXPENSES ................     306,506      293,552
                                                         ---------    ---------

OTHER OPERATING EXPENSES:
  Operations and maintenance excluding fuel expenses .      96,416       88,016
  Depreciation and amortization ......................      92,147       92,015
  Income taxes .......................................      24,464       22,292
  Other taxes ........................................      29,938       29,790
                                                         ---------    ---------
     Total ...........................................     242,965      232,113
                                                         ---------    ---------
OPERATING INCOME .....................................      63,541       61,439
                                                         ---------    ---------

OTHER INCOME (DEDUCTIONS):
  Other - net ........................................      (2,396)      (2,209)
  Income taxes .......................................       4,455        4,340
                                                         ---------    ---------
     Total ...........................................       2,059        2,131
                                                         ---------    ---------
INCOME BEFORE INTEREST DEDUCTIONS ....................      65,600       63,570
                                                         ---------    ---------

INTEREST DEDUCTIONS:
  Interest on long-term debt .........................      35,183       34,429
  Interest on short-term borrowings ..................         684        2,328
  Debt discount, premium and expense .................       1,949        2,002
  Capitalized interest ...............................      (4,151)      (3,834)
                                                         ---------    ---------
     Total ...........................................      33,665       34,925
                                                         ---------    ---------

NET INCOME ...........................................      31,935       28,645
PREFERRED STOCK DIVIDEND REQUIREMENTS ................       2,878        3,626
                                                         ---------    ---------
EARNINGS FOR COMMON STOCK ............................   $  29,057    $  25,019
                                                         =========    =========

See Notes to Condensed Financial Statements.

                                       -3-

                         ARIZONA PUBLIC SERVICE COMPANY
                         CONDENSED STATEMENTS OF INCOME
                         ------------------------------
                                   (Unaudited)


                                                              Twelve Months
                                                             Ended March 31,
                                                       --------------------------
                                                           1998           1997
                                                       -----------    -----------
                                                          (Thousands of Dollars)

                                                                        
ELECTRIC OPERATING REVENUES ........................   $ 1,879,955    $ 1,752,032
                                                       -----------    -----------

FUEL EXPENSES:
  Fuel for electric generation .....................       200,547        239,181
  Purchased power ..................................       224,528        115,539
                                                       -----------    -----------
     Total .........................................       425,075        354,720
                                                       -----------    -----------
OPERATING REVENUES LESS FUEL EXPENSES ..............     1,454,880      1,397,312
                                                       -----------    -----------

OTHER OPERATING EXPENSES:
  Operations and maintenance excluding fuel expenses       407,834        430,987
  Depreciation and amortization ....................       365,803        330,839
  Income taxes .....................................       186,909        169,446
  Other taxes ......................................       120,407        116,915
                                                       -----------    -----------
     Total .........................................     1,080,953      1,048,187
                                                       -----------    -----------
OPERATING INCOME ...................................       373,927        349,125
                                                       -----------    -----------

OTHER INCOME (DEDUCTIONS):
  AFUDC - equity ...................................          --            3,534
  Other - net ......................................       (10,014)       (17,462)
  Income taxes .....................................        31,528         44,242
                                                       -----------    -----------
     Total .........................................        21,514         30,314
                                                       -----------    -----------
INCOME BEFORE INTEREST DEDUCTIONS ..................       395,441        379,439
                                                       -----------    -----------

INTEREST DEDUCTIONS:
  Interest on long-term debt .......................       141,685        144,695
  Interest on short-term borrowings ................         7,760         10,279
  Debt discount, premium and expense ...............         7,738          8,061
  Capitalized interest .............................       (16,525)       (10,106)
                                                       -----------    -----------
     Total .........................................       140,658        152,929
                                                       -----------    -----------

NET INCOME .........................................       254,783        226,510
PREFERRED STOCK DIVIDEND REQUIREMENTS ..............        12,055         16,241
                                                       -----------    -----------
EARNINGS FOR COMMON STOCK ..........................   $   242,728    $   210,269
                                                       ===========    ===========


See Notes to Condensed Financial Statements.

                                       -4-

                         ARIZONA PUBLIC SERVICE COMPANY
                            CONDENSED BALANCE SHEETS
                            ------------------------

                                     ASSETS
                                   (Unaudited)
                                                      March 31,     December 31,
                                                         1998           1997
                                                     -----------    ------------

                                                       (Thousands of Dollars)
UTILITY PLANT:
Electric plant in service and held for future use    $ 7,024,991    $ 7,009,059
Less accumulated depreciation and amortization ...     2,685,184      2,620,607
                                                     -----------    -----------
   Net ...........................................     4,339,807      4,388,452
Construction work in progress ....................       270,147        237,492
Nuclear fuel, net of amortization ................        58,737         51,624
                                                     -----------    -----------
   Utility plant - net ...........................     4,668,691      4,677,568
                                                     -----------    -----------

INVESTMENTS AND OTHER ASSETS .....................       167,243        164,906
                                                     -----------    -----------

CURRENT ASSETS:
Cash and cash equivalents ........................         8,936         12,552
Accounts receivable:
   Service customers .............................       112,208        141,022
   Other .........................................        17,847         31,313
   Allowance for doubtful accounts ...............          (981)        (1,338)
Accrued utility revenues .........................        49,531         58,559
Materials and supplies, at average cost ..........        72,902         70,634
Fossil fuel, at average cost .....................        10,854          9,621
Deferred income taxes ............................         3,496          3,496
Other ............................................        27,013         24,529
                                                     -----------    -----------
   Total current assets ..........................       301,806        350,388
                                                     -----------    -----------

DEFERRED DEBITS:
Regulatory asset for income taxes ................       444,887        458,369
Rate synchronization cost deferral ...............       345,068        358,871
Unamortized costs of reacquired debt .............        61,592         63,501
Unamortized debt issue costs .....................        15,576         15,303
Other ............................................       236,254        242,236
                                                     -----------    -----------
   Total deferred debits .........................     1,103,377      1,138,280
                                                     -----------    -----------

   TOTAL .........................................   $ 6,241,117    $ 6,331,142
                                                     ===========    ===========

See Notes to Condensed Financial Statements.

                                       -5-

                         ARIZONA PUBLIC SERVICE COMPANY
                            CONDENSED BALANCE SHEETS
                            ------------------------

                                   LIABILITIES
                                   (Unaudited)


                                                                  March 31,    December 31,
                                                                    1998           1997
                                                                ------------   ------------

                                                                   (Thousands of Dollars)
                                                                                 
CAPITALIZATION:
Common stock ...............................................     $  178,162     $  178,162
Premiums and expenses - net ................................      1,142,499      1,142,364
Retained earnings ..........................................        472,853        528,798
                                                                 ----------     ----------
   Common stock equity .....................................      1,793,514      1,849,324
Non-redeemable preferred stock .............................        141,317        142,051
Redeemable preferred stock .................................         19,110         29,110
Long-term debt less current maturities .....................      2,019,248      1,953,162
                                                                 ----------     ----------
   Total capitalization ....................................      3,973,189      3,973,647
                                                                 ----------     ----------

CURRENT LIABILITIES:
Commercial paper ...........................................         81,000        130,750
Current maturities of long-term debt .......................          4,068        104,068
Accounts payable ...........................................         72,467        107,423
Accrued taxes ..............................................        141,148         85,886
Accrued interest ...........................................         26,247         31,660
Common dividends payable ...................................         42,500           --
Customer deposits ..........................................         28,788         29,116
Other ......................................................         29,094         19,588
                                                                 ----------     ----------
   Total current liabilities ...............................        425,312        508,491
                                                                 ----------     ----------

DEFERRED CREDITS AND OTHER:
Deferred income taxes ......................................      1,337,255      1,345,177
Deferred investment tax credit .............................         56,639         60,093
Unamortized gain - sale of utility plant ...................         81,219         82,363
Customer advances for construction .........................         30,083         29,294
Other ......................................................        337,420        332,077
                                                                 ----------     ----------
   Total deferred credits and other ........................      1,842,616      1,849,004
                                                                 ----------     ----------

COMMITMENTS AND CONTINGENCIES  (Notes 5, 8, and 9)

   TOTAL ...................................................     $6,241,117     $6,331,142
                                                                 ==========     ==========


See Notes to Condensed Financial Statements.

                                       -6-

                         ARIZONA PUBLIC SERVICE COMPANY
                       CONDENSED STATEMENTS OF CASH FLOWS
                       ----------------------------------
                                   (Unaudited)
                                                              Three Months
                                                             Ended March 31,
                                                         ----------------------
                                                            1998         1997
                                                         ---------    ---------
                                                         (Thousands of Dollars)
Cash Flows from Operating Activities:
  Net income .........................................   $  31,935    $  28,645
  Items not requiring cash:
    Depreciation and amortization ....................      92,147       92,015
    Nuclear fuel amortization ........................       8,417        7,523
    Deferred income taxes - net ......................      (7,010)      (8,948)
    Deferred investment tax credit - net .............      (3,454)      (3,380)
  Changes in certain current assets and liabilities:
    Accounts receivable - net ........................      41,923       24,589
    Accrued utility revenues .........................       9,028        6,244
    Materials, supplies and fossil fuel ..............      (3,501)       2,196
    Other current assets .............................      (2,484)      (2,024)
    Accounts payable .................................     (33,020)     (48,355)
    Accrued taxes ....................................      55,262       47,992
    Accrued interest .................................      (5,413)     (14,482)
    Other current liabilities ........................       7,528        4,313
  Other - net ........................................      13,730       28,385
                                                         ---------    ---------
Net cash flow provided by operating activities .......     205,088      164,713
                                                         ---------    ---------
Cash Flows from Investing Activities:
  Capital expenditures ...............................     (60,848)     (77,129)
  Capitalized interest ...............................      (4,151)      (3,834)
  Other ..............................................      (2,533)      (4,046)
                                                         ---------    ---------
      Net cash flow used for investing activities ....     (67,532)     (85,009)
                                                         ---------    ---------

Cash Flows from Financing Activities:
  Long-term debt .....................................      99,375         --
  Short-term borrowings - net ........................     (49,750)     199,400
  Dividends paid on common stock .....................     (42,500)     (42,500)
  Dividends paid on preferred stock ..................      (2,964)      (3,897)
  Repayment of preferred stock .......................     (10,599)     (25,980)
  Repayment and reacquisition of long-term debt ......    (134,734)    (193,056)
                                                         ---------    ---------
      Net cash flow used for financing activities ....    (141,172)     (66,033)
                                                         ---------    ---------

Net increase (decrease) in cash and cash equivalents .      (3,616)      13,671
Cash and cash equivalents at beginning of period .....      12,552       12,521
                                                         ---------    ---------
Cash and cash equivalents at end of period ...........   $   8,936    $  26,192
                                                         =========    =========

Supplemental Disclosure of Cash Flow Information:
  Cash paid during the period for:
    Interest (excluding capitalized interest) ........   $  37,072    $  48,051
    Income taxes .....................................   $   1,250    $   9,814

See Notes to Condensed Financial Statements.

                                      -7-

                         ARIZONA PUBLIC SERVICE COMPANY

                     NOTES TO CONDENSED FINANCIAL STATEMENTS

1. In the opinion of the Company, the accompanying unaudited condensed financial
statements  contain all adjustments  (consisting of normal  recurring  accruals)
necessary to present  fairly the  financial  position of the Company as of March
31, 1998, the results of operations for the three months and twelve months ended
March 31, 1998 and 1997, and the cash flows for the three months ended March 31,
1998 and 1997. It is suggested  that these  condensed  financial  statements and
notes  to  condensed  financial  statements  be read  in  conjunction  with  the
financial  statements  and notes to  financial  statements  included in the 1997
10-K.

2.  The  Company's  operations  are  subject  to  seasonal  fluctuations,   with
variations in energy usage by customers occurring from season to season and from
month to month  within a  season,  primarily  as a result  of  changing  weather
conditions.  For this and other  reasons,  the results of operations for interim
periods are not  necessarily  indicative  of the results to be expected  for the
full year.

3. All the  outstanding  shares  of  common  stock of the  Company  are owned by
Pinnacle West.

4. See  "Liquidity  and Capital  Resources" in Part I, Item 2 of this report for
changes in capitalization for the three months ended March 31, 1998.

5. Regulatory Matters --- Electric Industry Restructuring

State

ACC  Rules.  The ACC has  been  conducting  an  ongoing  investigation  into the
restructuring  of the  Arizona  electric  industry.  In December  1996,  the ACC
adopted rules that provide a framework for the  introduction  of retail electric
competition. The ACC framework rules include the following major provisions:

o    The rules are  intended to apply to virtually  all of the Arizona  electric
     utilities regulated by the ACC, including the Company.

o    Each affected  utility would be required to make  available at least 20% of
     its 1995 system retail peak demand for competitive generation supply to all
     customer  classes  not later than  January 1, 1999;  at least 50% not later
     than January 1, 2001;  and all of its retail  demand not later than January
     1, 2003.

o    Electric  service  providers that obtain  Certificates  of Convenience  and
     Necessity (CC&Ns) from the ACC would be allowed to supply,  market,  and/or
     broker specified electric services at retail.  These services would include
     electric generation, but exclude electric transmission and distribution. 

                                      -8-

o    On or before December 31, 1997, each affected  utility was required to file
     with the ACC  proposed  tariffs  for bundled  service,  if  different  than
     current  tariffs,  and unbundled  service.  Bundled  service means electric
     service  elements  (i.e.,  generation,   transmission,   distribution,  and
     ancillary  services)  provided as a package to consumers within an affected
     utility's  current service area.  Unbundled  service means electric service
     elements provided and priced separately.

o    The rules indicate that the ACC will allow recovery of unmitigated stranded
     costs.  Stranded costs are the costs of generating plants, other assets and
     contract  commitments that were prudently incurred to serve power customers
     that could go unrecovered if these customers are allowed to use open access
     to move to another  supplier.  Each  affected  utility would be required to
     file with the ACC its  estimates of  unmitigated  stranded  costs.  The ACC
     would then, after hearing and  consideration of various factors,  determine
     the  magnitude of stranded  costs and  appropriate  stranded  cost recovery
     mechanisms and charges.

The ACC  ordered  in the rules  that  numerous  issues  (including  reliability;
stranded cost measurement and recovery; the phase-in process, bundled, unbundled
and metering  services;  legal issues;  and independent system operator and spot
market development) require additional  consideration prior to implementation of
retail electric competition.  During 1997, the ACC conducted workshops to gather
input from various constituencies with respect to those issues. In 1998, the ACC
has continued conducting workshops on certain of the issues.

In February 1998, the ACC completed a formal,  generic  hearing on stranded cost
determination  and  recovery.  Based  on  various  assumptions,   estimates  and
methodologies,  the Company  currently  estimates  that its stranded costs to be
recovered (excluding  regulatory assets which have already been addressed by the
ACC) will be less than $500  million.  The Company is seeking  full  recovery of
stranded costs during a transition period proposed to go through 2006. On May 6,
1998,  an ACC  Hearing  Officer  issued  a  Recommended  Decision  in the  above
proceeding that,  although  recommending an opportunity for full recovery of the
Company's  stranded costs,  would impose certain  conditions and restrictions on
stranded cost recovery.  However,  final  decisions by the ACC have not yet been
made with respect to this issue.

The Company  believes that certain  provisions  of the ACC  framework  rules are
deficient.  In February  1997, a lawsuit was filed by the Company to protect its
legal  rights  regarding  those  rules.  That lawsuit is pending but two related
cases filed by other  utilities have been partially  decided in a manner adverse
to those utilities' positions.

Legislative Initiatives. An Arizona joint legislative committee studied electric
utility industry restructuring issues in 1996 and 1997. In conjunction with that
study,  Arizona  legislative  counsel prepared memoranda in late 1997 related to
the legal authority of

                                      -9-

the ACC to deregulate the Arizona electric utility industry. The memoranda raise
a  question  as  to  the  degree  to  which  the  ACC  may,  under  the  Arizona
Constitution,  deregulate any portion of the electric utility industry and allow
rates to be determined by market  forces.  This latter issue (the ability of the
ACC to set rates  based on the  competitive  market) was decided in favor of the
ACC in the related lawsuits referenced in the preceding paragraph.

In May 1998, the final version of a bill to facilitate  implementation of retail
electric  competition in the state was approved by the  House/Senate  conference
committee of the Arizona  legislature.  The bill  includes the  following  major
provisions: (a) requirements that Arizona's largest government-operated electric
utility (Salt River Project) and, at their option, smaller city electric systems
(i) open their service  territories to electric  service  providers to implement
retail  electric  generation  competition  for 20% of each utility's 1995 retail
peak demand by December  31, 1998 and for all retail  customers  by December 31,
2000;  (ii) decrease rates by at least 10% over a ten-year  period  beginning as
early as January 1,  1991;  (iii)  implement  procedures  and public  processes,
including  judicial  review at the request of either an interested  party or the
Arizona Attorney General, for establishing the terms,  conditions and pricing of
electric  services as well as certain other decisions  affecting retail electric
competition,  which  procedures  and processes  are  comparable to those already
applicable to public  service  corporations;  (b) a  description  of the factors
which  form the basis of  consideration  by Salt River  Project  in  determining
stranded costs; and (c) a requirement, both for public power entities and public
service corporations (including the Company), that billing, collection, metering
and meter reading  services be provided on a competitive  basis during the first
two years of  competition  only for  customers  having  demands in excess of one
megawatt  (and that are  eligible  for  competitive  generation  services),  and
thereafter for all customers receiving competitive electric generation.

The legislature will also review and make  recommendations  for the 1999 Arizona
legislature on certain issues, including: whether public power entities excluded
from the  current  bill  should be included;  taxation  issues  associated  with
electric competition;  regulation of public power entities outside their service
territory;  constitutional issues relating to facilitating electric competition;
system priority,  capacity,  capability and reliability;  antitrust issues;  and
public power entities  compliance with the code of conduct and affiliate  issues
between competitive and noncompetitive service electricity  providers.  The bill
now goes to the Arizona House and Senate for a final vote and, if passed, to the
Governor for consideration.

Federal

The  Energy  Policy  Act of 1992 and recent  rulemakings  by FERC have  promoted
increased  competition in the wholesale electric power markets. The Company does
not expect these rules to have a material impact on its financial statements.

Several  electric  utility  reform  bills  have been  introduced  during  recent
congressional  sessions,  which as currently  written,  would allow consumers to
choose their  electricity  suppliers by 2000 or 2003.  These bills,  other bills
that are expected to be introduced, 

                                      -10-

and ongoing  discussions  at the federal  level  suggest a wide range of opinion
that  will need to be  narrowed  before  any  substantial  restructuring  of the
electric utility industry can occur.

Regulatory Accounting

The Company prepares its financial  statements in accordance with the provisions
of Statement of Financial  Accounting  Standards (SFAS) No. 71,  "Accounting for
the Effects of Certain Types of Regulation."  SFAS No. 71 requires a cost-based,
rate-regulated  enterprise to reflect the impact of regulatory  decisions in its
financial  statements.  The  Company's  existing  regulatory  orders and current
regulatory  environment  support its accounting  practices related to regulatory
assets,  which  amounted  to  approximately $0.9 billion at March 31,  1998.  In
accordance  with  the  1996  regulatory  agreement,   the  ACC  accelerated  the
amortization  of  substantially  all of the  Company's  regulatory  assets to an
eight-year period that began July 1, 1996.

During 1997, the Emerging  Issues Task Force (EITF) of the Financial  Accounting
Standards  Board (FASB)  issued EITF 97-4,  which  requires  that SFAS No. 71 be
discontinued no later than when  legislation is passed or a rate order is issued
that  contains  sufficient  detail to determine its effect on the portion of the
business being  deregulated,  which could result in write-downs or write-offs of
physical  and/or  regulatory  assets.  Additionally,  the EITF  determined  that
regulatory  assets should not be written off if they are to be recovered  from a
portion of the entity which continues to apply SFAS No. 71.

Although  the ACC has issued  rules for  transitioning  generation  services  to
competition,  there are many unresolved  issues.  The Company continues to apply
SFAS No. 71 to all of its operations.  If rate recovery of regulatory  assets is
no longer probable, whether due to competition or regulatory action, the Company
would be required to write off the remaining balance as an extraordinary  charge
to expense.

General

The Company believes that further ACC decisions,  legislation at the Arizona and
federal  levels  and  perhaps  amendments  to the  Arizona  Constitution  (which
amendments  would  require a vote of the  people)  will  ultimately  be required
before  significant  implementation of retail electric  competition can lawfully
occur in Arizona.  Until the manner of implementation of competition,  including
addressing stranded costs, is determined,  the Company cannot accurately predict
the impact of full retail competition on its financial  position,  cash flows or
results of  operation.  As  competition  in the electric  industry  continues to
evolve,  the Company will continue to evaluate  strategies and alternatives that
will position the Company to compete in the new regulatory environment.

                                      -11-

6. Regulatory Matters --- 1996 Regulatory Agreement

In April 1996, the ACC approved a regulatory  agreement  between the Company and
the ACC Staff. The major provisions of this agreement are:

o    An annual rate reduction of approximately  $48.5 million ($29 million after
     income taxes), or 3.4% on average for all customers except certain contract
     customers, effective July 1, 1996.

o    Recovery of substantially  all of the Company's  present  regulatory assets
     through accelerated  amortization over an eight-year period that began July
     1, 1996,  increasing annual amortization by approximately $120 million ($72
     million after income taxes).

o    A  formula  for  sharing   future  cost  savings   between   customers  and
     shareholders  (price reduction formula)  referencing a return on equity (as
     defined) of 11.25%.

o    A moratorium  on filing for  permanent  rate changes prior to July 2, 1999,
     except under the price  reduction  formula and under  certain other limited
     circumstances.

o    Infusion  of $200  million of common  equity  into the  Company by Pinnacle
     West, in annual payments of $50 million starting in 1996.

Pursuant to the price reduction formula,  in May 1997, the ACC approved a retail
price  decrease of  approximately  $17.6  million  ($10.5  million  after income
taxes),  or 1.2%,  effective July 1, 1997. In March 1998, the Company filed with
the ACC its  calculation  of an annual  price  reduction  of  approximately  $17
million ($10 million after income taxes),  or 1.1%, to become  effective July 1,
1998. The amount and timing of the price decrease are subject to ACC approval.

7. Agreement with Salt River Project

On April 25, 1998, the Company and Salt River Project  entered into a Memorandum
of Agreement in anticipation  of, and to facilitate,  the opening of the Arizona
electric  industry.  The Agreement contains the following major components (some
of which are subject to approval of their respective Boards of Directors):

o    The Company and Salt River Project would amend the Territorial Agreement to
     remove any barriers to the provision of competitive  electricity supply and
     non-distribution services.

o    The  Company  and Salt River  Project  would  amend the Power  Coordination
     Agreement to lower the price that the Company  will pay Salt River  Project
     for purchased power by  approximately  $17 million  (pretax) in 1999 and by
     lesser annual amounts through 2006.

                                      -12-

o    The Company and Salt River Project agreed on certain legislative  positions
     regarding electric utility restructuring at the state and federal level.

An ACC docket has been established so that the ACC may review certain provisions
of the Agreement.  The ACC Staff has requested the ACC Hearing Devision to issue
a procedural order to govern the proceedings  before the ACC on this matter.  In
its request,  the ACC Staff  identified  certain issues that it believes the ACC
should consider,  including whether (a) the Territorial Agreement remains in the
public  interest,  (b)  the  Agreement  is a  restraint  of  trade,  and (c) the
Agreement will materially  lessen the potential for retail electric  competition
in Arizona. The Company cannot predict what action, if any, will result from any
ACC hearings that may be held with respect to the Agreement.

The Antitrust  Unit of the Arizona  Attorney  General's  Office,  which has been
involved in the ongoing  regulatory and  legislative  proceedings  regarding the
restructuring of the Arizona electric industry,  has requested  clarification of
the operation of certain of the Agreement's provisions. The Company is currently
engaged in discussions with the Arizona Attorney General's Office regarding this
matter.

8. The Palo Verde  participants  have  insurance for public  liability  payments
resulting  from  nuclear  energy  hazards to the full limit of  liability  under
federal law. This potential  liability is covered by primary liability insurance
provided by commercial  insurance carriers in the amount of $200 million and the
balance by an industry-wide  retrospective  assessment program. If losses at any
nuclear power plant covered by the programs  exceed the accumulated  funds,  the
Company  could  be  assessed  retrospective  premium  adjustments.  The  maximum
assessment  per  reactor  under  the  program  for  each  nuclear   incident  is
approximately  $79  million,  subject  to an  annual  limit of $10  million  per
incident. Based upon the Company's 29.1% interest in the three Palo Verde units,
the Company's  maximum  potential  assessment per incident is approximately  $69
million, with an annual payment limitation of approximately $9 million.

The Palo Verde  participants  maintain "all risk"  (including  nuclear  hazards)
insurance for property damage to, and decontamination of, property at Palo Verde
in the aggregate  amount of $2.75 billion,  a substantial  portion of which must
first be applied to  stabilization  and  decontamination.  The  Company has also
secured  insurance  against  portions of any  increased  cost of  generation  or
purchased power and business interruption resulting from a sudden and unforeseen
outage of any of the three units. The insurance  coverage  discussed in this and
the previous paragraph is subject to certain policy conditions and exclusions.

9. The Company has encountered  tube cracking in the Palo Verde steam generators
and has taken, and will continue to take, remedial actions that it believes have
slowed the rate of tube  degradation.  The  projected  service life of the steam
generators is reassessed  periodically and these analyses  indicate that it will
be economically desirable for the Company to replace the Unit 2 steam generators
between 2003 and 2008. The Company  

                                      -13-

estimates that its share of the replacement costs (in 1998 dollars and including
installation  and replacement  power costs) will be  approximately  $50 million,
most of which will be incurred after the year 2000. During the fourth quarter of
1997,  the Palo  Verde  participants,  including  the  Company,  entered  into a
contract for the fabrication of two replacement  steam  generators.  The cost to
the Company is estimated at approximately $26 million.  These generators will be
used as replacements if performance of existing generators  deteriorates to less
than  acceptable  levels.  The  generators  are  expected  on site in 2002.  The
Company's share of installation costs is approximately $24 million. Based on the
latest  available  data, the Company  estimates that the Unit 1 and Unit 3 steam
generators  should  operate  for the  license  periods  (until  2025  and  2027,
respectively), although the Company will continue its normal periodic assessment
of these steam generators.

10. In the first  quarter of 1998 the Company  adopted SFAS No. 130,  "Reporting
Comprehensive  Income."  This  standard  changed the  reporting of certain items
previously reported in the common stock equity section of the balance sheet. The
effects of adopting  SFAS No. 130 were not material to the  Company's  financial
statements.

The Financial  Accounting  Standards  Board issued SFAS No. 131 on  "Disclosures
about  Segments  of an  Enterprise  and Related  Information"  and SFAS No. 132,
"Employers' Disclosures about Pensions and Other Postretirement  Benefits," both
of which are effective for fiscal years  beginning after December 15, 1997. SFAS
No.  131  requires  that  public  companies  report  certain  information  about
operating segments in their financial  statements.  It also establishes  related
disclosures about products and services,  geographic areas, and major customers.
The Company is currently  evaluating  what impact this standard will have on its
disclosures.  SFAS No. 132 standardizes the disclosure requirements for pensions
and other postretirement  benefits. It is not expected to have a material effect
on the Company's financial statement disclosures.

                                      -14-

                         ARIZONA PUBLIC SERVICE COMPANY

Item 2. Management's  Discussion and Analysis of Financial Condition and Results
        ------------------------------------------------------------------------
of Operations.
- --------------

Operating Results
- -----------------

        The following table  summarizes the Company's  revenues and earnings for
the three-month and twelve-month periods ended March 31, 1998 and 1997:

                                           Periods ended March 31
                                           (Thousands of Dollars)

                                  Three Months                Twelve Months
                            ------------------------    ------------------------
                               1998          1997          1998          1997
                            ------------------------    ------------------------

Operating Revenues          $  380,423    $  379,021    $1,879,955    $1,752,032

Earnings for
Common stock                $   29,057    $   25,019    $  242,728    $  210,269


         Operating  Results -  Three-month  period ended March 31, 1998 compared
         -----------------------------------------------------------------------
         with three-month period ended March 31, 1997
         --------------------------------------------

         Earnings increased $4 million in the three-month  comparison  primarily
because of strong customer growth,  partially offset by increased operations and
maintenance expenses.

         Operating revenues increased $1 million because the effects of customer
growth ($13  million)  and weather ($3  million)  offset a decrease in sales for
resale ($10 million) and a price reduction ($4 million).  See Note 6 of Notes to
Condensed Financial Statements for information on the price reduction. Sales for
resale  are  wholesale  electricity  sales  to  third  parties  who  resell  the
electricity to their customers. The decrease in sales for resale was a result of
changes  in power  marketing  activity,  which  can vary  from  period to period
without  corresponding  effects on earnings  because of related  fluctuations in
purchased power costs.

         Operation and maintenance  expenses increased $8 million as a result of
growth and increased expenses due to impending competition, increased outages at
coal  plants  and other  miscellaneous  factors,  partially  offset  by  savings
resulting from a 1996 voluntary severance program.

                                      -15-

         Operating  Results - Twelve-month  period ended March 31, 1998 compared
         -----------------------------------------------------------------------
         with twelve-month period ended March 31, 1997
         ---------------------------------------------

         Earnings  increased $32 million in the  twelve-month  comparison  ended
March 31, 1998 primarily because of customer growth; a $32 million pretax charge
in 1996 for a voluntary severance program;  two fuel-related  settlements in the
third quarter of 1997; and lower financing  costs.  These positive  factors more
than offset the effects of the 1996 regulatory agreement with the ACC, which, in
the twelve-month  comparison,  resulted in $27 million of additional  regulatory
asset amortization and a $28 million revenue decrease caused by two retail price
reductions. See Note 6 of Notes to Condensed Financial Statements for additional
information about the regulatory agreement.  In the period ended March 31, 1997,
the Company also  recognized $11 million of income tax benefits  associated with
capital loss carryforwards.

         Operating   revenues   increased  $128  million  primarily  because  of
increases in sales for resale ($95 million);  customer  growth ($59 million) and
weather effects ($12 million).  As mentioned above,  these positive factors were
partially  offset by the $28 million  revenue  decrease  caused by retail  price
reductions  and by various  other  factors ($10  million).  Sales for resale are
wholesale electricity sales to third parties who resell the electricity to their
customers.  The increase in sales for resale was a result of increased  activity
in  competitive  bulk power  markets.  The  increase in sales for resale did not
significantly  affect  earnings  because it was  substantially  offset by higher
power purchases.

         The  two  fuel-related   settlements  increased  the  Company's  pretax
earnings by approximately $21 million.  The Company's income statement  reflects
these settlements as reductions in fuel expense and as other income.

         Operations  and  maintenance  expenses were lower because of the charge
for the  voluntary  severance  program  recorded in 1996 and related  savings in
1997. These savings were partially  offset by increased  expenses as a result of
growth and competition, and other miscellaneous factors.

         Financing  costs  decreased  $10  million  because of lower  amounts of
outstanding debt and preferred stock.

         Other Income
         ------------

         As part of a 1994 rate settlement with the ACC, the Company accelerated
amortization  of  substantially  all deferred ITCs over a five-year  period that
ends on December 31, 1999.  The  amortization  of ITCs is shown on the Company's
income  statement as Other Income --- Income Taxes and  decreases  annual income
tax expense by approximately $28 million.

                                      -16-

Liquidity and Capital Resources
- -------------------------------

         For the  three  months  ended  March 31,  1998,  the  Company  incurred
approximately $60 million in capital expenditures, which is approximately 19% of
the most recently estimated 1998 capital  expenditures.  The Company's projected
capital  expenditures  for the next three years are: 1998,  $323 million;  1999,
$313 million; and 2000, $306 million, respectively.  These amounts include about
$30 - $35 million each year for nuclear  fuel  expenditures.  In  addition,  the
Company is considering expanding certain of its businesses over the next several
years, which may result in increased expenditures.

         The   Company's   long-term   debt  and  preferred   stock   redemption
requirements and payment  obligations on a capitalized  lease for the next three
years are:  1998,  $165 million;  1999,  $174 million;  and 2000,  $109 million.
During the three months ended March 31, 1998, the Company redeemed approximately
$135  million  of its  long-term  debt  and  approximately  $11  million  of its
preferred stock with cash from operations and long-term and short-term  debt. As
a result of the 1996  regulatory  agreement  (see  Note 6 of Notes to  Condensed
Financial Statements), Pinnacle West invested $50 million in the Company in 1996
and 1997 and will invest similar amounts  annually in 1998 and 1999.  During the
three  months  ended  March 31,  1998,  the Company  issued $100  million of its
unsecured debt.

         Although  provisions  in the  Company's  bond  indenture,  articles  of
incorporation,  and financing  orders from the ACC establish  maximum amounts of
additional  first mortgage bonds and preferred stock that the Company may issue,
management  does not expect  any of these  restrictions  to limit the  Company's
ability to meet its capital requirements.

Year 2000 Technology Issues
- ---------------------------

         The Company has made, and will continue to make, certain  modifications
to its computer  hardware and software  systems and  applications to ensure they
are capable of handling  dates in the year 2000 and  thereafter.  The  Company's
major  computer  systems have been updated and other systems are being  analyzed
for  potential  modifications.  The  financial  impact  on  the  Company  is not
anticipated to be material to its financial  position,  cash flows or results of
operations.  The  Company is in the  process of formal  communications  with its
significant  suppliers,  business partners, and large customers to determine the
extent to which it may be affected by these third  parties'  plans to  remediate
their own year 2000 issues in a timely manner.

Competition and Electric Industry Restructuring
- -----------------------------------------------

         See Note 5 of Notes to Condensed Financial Statements in Part I, Item 1
of this  report for  discussions  of  competitive  developments  and  regulatory
accounting.  See Note 7 of Notes to Condensed  Financial  Statements  in Part I,
Item 1 of this report for a

                                      -17-

discussion of a proposed amendment to a Power  Coordination  Agreement with Salt
River  Project  that the Company  estimates  would  reduce its pretax  costs for
purchased  power by  approximately  $17  million  in 1999 and by  lesser  annual
amounts through 2006.

Rate Matters
- ------------

         See Note 6 of Notes to Condensed Financial Statements in Part I, Item 1
of this report for a discussion of a proposed price reduction.

Forward-Looking Statements
- --------------------------

         The above discussion contains  forward-looking  statements that involve
risks and uncertainties.  Words such as "estimates,"  "expects,"  "anticipates,"
"plans,"    "believes,"    "projects,"   and   similar   expressions    identify
forward-looking  statements.  These risks and uncertainties include, but are not
limited to, the ongoing  restructuring of the electric industry;  the outcome of
the regulatory  proceedings relating to the restructuring;  regulatory,  tax and
environmental  legislation;  the ability of the Company to successfully  compete
outside its traditional regulated markets;  regional economic conditions,  which
could  affect  customer  growth;  the cost of debt and equity  capital;  weather
variations  affecting  customer  usage;  and  technological  developments in the
electric industry.

         These  factors and the other matters  discussed  above may cause future
results  to differ  materially  from  historical  results,  or from  results  or
outcomes currently expected or sought by the Company.

                                      -18-

                           PART II - OTHER INFORMATION
                           ---------------------------

ITEM 5.      Other Information
- ------------------------------

Purported Navajo Environmental Regulation
- -----------------------------------------

         As  previously   reported,   in  February  1998,  the  EPA  promulgated
regulations  specifying  those  provisions  of the Clean Air Act for which it is
appropriate to treat Indian tribes in the same manner as states, and the Company
reviewed the  regulations to determine what effect they may have on Four Corners
and  NGS.  See  "Environmental   Matters  ---  Purported  Navajo   Environmental
Regulation"  in Part I, Item 1 of the 1997 10-K. On April 10, 1998,  the Company
filed a  Petition  for  Review in the United  States  Court of  Appeals  for the
District  of  Columbia.   Arizona  Public  Service   Company  v.  United  States
Environmental Protection Agency, No. 98-1196.

         Palo Verde Nuclear Generating Station
         -------------------------------------

         See Note 9 of Notes to Condensed Financial Statements in Part I, Item 1
of this  report  for a  discussion  of issues  regarding  the Palo  Verde  steam
generators.

         Construction and Financing Programs
         -----------------------------------

         See "Liquidity and Capital  Resources" in Part I, Item 2 of this report
for a discussion of the Company's construction and financing programs.

         Competition and Electric Industry Restructuring
         -----------------------------------------------

         See Note 5 of Notes to Condensed Financial Statements in Part I, Item 1
of this report for a  discussion  of  competition  and the Rules  regarding  the
introduction of retail electric  competition in Arizona. On February 28, 1997, a
lawsuit was filed by the Company to protect its legal rights regarding the Rules
and in its complaint the Company asked the Court for (i) a judgment vacating the
retail electric  competition  rules, (ii) a declaratory  judgment that the Rules
are unlawful because,  among other things, they were entered into without proper
legal  authorization,  and (iii) a  permanent  injunction  barring  the ACC from
enforcing or implementing the Rules and from  promulgating any other regulations
without lawful authority.

ITEM 6.  Exhibits and Reports on Form 8-K
- -----------------------------------------

         (a)  Exhibits

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

10.1          Territorial Agreement

10.2          Power Coordination Agreement

10.3          Memorandum of Agreement between the Company and Salt River Project

27.1          Financial Data Schedule

                                      -19-

     In addition to those Exhibits shown above, the Company hereby  incorporates
the  following  Exhibits  pursuant  to Exchange  Act Rule 12b-32 and  Regulation
ss.229.10(d) by reference to the filings set forth below:



Exhibit No.     Description                        Originally Filed as Exhibit:      File No.(a)   Date Effective
- -----------     -----------                        ----------------------------      ---------     --------------

                                                                                          
  3.1           Bylaws, amended as of              3.1 to 1995 Form 10-K             1-4473            3-29-96
                February 20, 1996                  Report

  3.2           Resolution of Board of             3.2 to 1994 Form 10-K             1-4473            3-30-95
                Directors temporarily              Report
                suspending Bylaws in part

  3.3           Articles of Incorporation,         4.2 to Form S-3                   1-4473            9-29-93
                restated as of May 25, 1988        Registration Nos.
                                                   33-33910 and 33-55248 by
                                                   means of September 24,
                                                   1993 Form 8-K Report

  3.4           Certificates pursuant to           4.3 to Form S-3                   1-4473            9-29-93
                Sections 10-152.01 and             Registration Nos.
                10-016, Arizona Revised            33-33910 and 33-55248 by
                Statutes, establishing Series A    means of September 24, 
                through V of the Company's         1993 Form 8-K Report 
                Serial Preferred Stock

  3.5           Certificate pursuant to            4.4 to Form S-3                   1-4473            9-29-93
                Section 10-016, Arizona            Registration Nos.
                Revised Statutes, establishing     33-33910 and 33-55248 by
                Series W of the Company's          means of September 24,
                Serial Preferred Stock             1993 Form 8-K Report

- ---------------------------
(a)Reports  filed  under  File  No.  1-4473  were  filed  in the  office  of the
Securities and Exchange Commission located in Washington, D.C.

         (b)  Reports on Form 8-K

         During the quarter  ended March 31,  1998,  and the period from April 1
through May 15, 1998, the Company filed the following reports on Form 8-K:

         Report dated  January 13, 1998  comprised of Exhibits to the  Company's
Registration Statements  (Registration Nos. 333-15379 and 333-27551) relating to
the Company's offering of $100 million of Notes.

                                      -20-

                                   SIGNATURES
                                   ----------


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




                                               ARIZONA PUBLIC SERVICE COMPANY
                                                       (Registrant)





Dated: May 15, 1998                         By: George A. Schreiber, Jr.
                                               ---------------------------------
                                               George A. Schreiber, Jr.
                                               Executive Vice President and
                                               Chief Financial Officer
                                               (Principal Financial Officer
                                               and Officer Duly Authorized
                                               sign this Report)