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                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

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

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


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

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


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


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


400 North Fifth Street, P.O. Box 53999
Phoenix, Arizona                                             85072-3999
(Address of principal executive offices)                     (Zip code)

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                                  Senior Notes
                       (Title of the indenture securities)


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1.   General information. Furnish the following information as to the Trustee:

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

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

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

     Federal Deposit Insurance Corporation          Washington, D.C. 20429

     New York Clearing House Association            New York, New York 10005

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

     Yes.

2.   Affiliations with Obligor.

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

     None.

16.  List of Exhibits.

     Exhibits identified in parentheses below, on file with the Commission,  are
     incorporated  herein by  reference as an exhibit  hereto,  pursuant to Rule
     7a-29  under the Trust  Indenture  Act of 1939  (the  "Act")  and 17 C.F.R.
     229.10(d).

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

     4.   A copy of the existing By-laws of the Trustee.  (Exhibit 4 to Form T-1
          filed with Registration Statement No. 33-31019.)
                                      -2-

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

     7.   A copy of the latest  report of  condition  of the  Trustee  published
          pursuant to law or to the requirements of its supervising or examining
          authority.
                                      -3-

                                    SIGNATURE



         Pursuant to the  requirements of the Act, the Trustee,  The Bank of New
York, a corporation  organized  and existing  under the laws of the State of New
York,  has duly caused this  statement of eligibility to be signed on its behalf
by the undersigned,  thereunto duly authorized, all in The City of New York, and
State of New York, on the 29th day of June, 1998.


                                         THE BANK OF NEW YORK



                                         By:     VAN K. BROWN
                                             -----------------------------------
                                             Name:  VAN K. BROWN
                                             Title: ASSISTANT VICE PRESIDENT
                                      -4-

                                                                       Exhibit 7
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                       Consolidated Report of Condition of

                              THE BANK OF NEW YORK

                     of 48 Wall Street, New York, N.Y. 10286
                     And Foreign and Domestic Subsidiaries,
a member of the Federal  Reserve System,  at the close of business  December 31,
1997,  published in accordance  with a call made by the Federal  Reserve Bank of
this District pursuant to the provisions of the Federal Reserve Act.

                                                                  Dollar Amounts
ASSETS                                                             in Thousands
Cash and balances due from depos-
  itory institutions:
  Noninterest-bearing balances and
   currency and coin .....................................        $  5,742,986
  Interest-bearing balances ..............................           1,342,769
Securities:
  Held-to-maturity securities ............................           1,099,736
  Available-for-sale securities ..........................           3,882,686
Federal funds sold and Securities pur-
  chased under agreements to resell ......................           2,568,530
Loans and lease financing
  receivables:
  Loans and leases, net of unearned
    income ...............................................          35,019,608
  LESS: Allowance for loan and
    lease losses .........................................             627,350
  LESS: Allocated transfer risk
    reserve ..............................................                   0
  Loans and leases, net of unearned
    income, allowance, and reserve .......................          34,392,258
Assets held in trading accounts ..........................           2,521,451
Premises and fixed assets (including
  capitalized leases) ....................................             659,209
Other real estate owned ..................................              11,992
Investments in unconsolidated
  subsidiaries and associated
  companies ..............................................             226,263
Customers' liability to this bank on
  acceptances outstanding ................................           1,187,449
Intangible assets ........................................             781,684
Other assets .............................................           1,736,574
                                                                  ------------
Total assets .............................................        $ 56,153,587
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LIABILITIES
Deposits:
  In domestic offices ....................................        $ 27,031,362
  Noninterest-bearing ....................................          11,899,507
  Interest-bearing .......................................          15,131,855
  In foreign offices, Edge and
  Agreement subsidiaries, and IBFs .......................          13,794,449
  Noninterest-bearing ....................................             590,999
  Interest-bearing .......................................          13,203,450
Federal funds purchased and Securities
  sold under agreements to repurchase ....................           2,338,881
Demand notes issued to the U.S. ..........................
  Treasury ...............................................             173,851
Trading liabilities ......................................           1,695,216
Other borrowed money:
  With remaining maturity of one year
    or less ..............................................           1,905,330
  With remaining maturity of more than
    one year through three years .........................                   0
  With remaining maturity of more than
    three years ..........................................              25,664
Bank's liability on acceptances exe-
  cuted and outstanding ..................................           1,195,923
Subordinated notes and debentures ........................           1,012,940
Other liabilities ........................................           2,018,960
                                                                  ------------
Total liabilities ........................................          51,192,576
                                                                  ------------

EQUITY CAPITAL
Common stock .............................................           1,135,284
Surplus ..................................................             731,319
Undivided profits and capital
  reserves ...............................................           3,093,726
Net unrealized holding gains
  (losses) on available-for-sale
  securities .............................................              36,866
Cumulative foreign currency transla-
  tion adjustments .......................................             (36,184)
                                                                  ------------
Total equity capital .....................................           4,961,011
                                                                  ------------
Total liabilities and equity
  capital ................................................        $ 56,153,587
                                                                  ============


      I,  Robert E.  Keilman,  Senior  Vice  President  and  Comptroller  of the
above-named  bank do hereby  declare  that this  Report  of  Condition  has been
prepared in conformance with the  instructions  issued by the Board of Governors
of the  Federal  Reserve  System  and is true to the  best of my  knowledge  and
belief.

                                                               Robert E. Keilman

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

      Thomas A. Renyi     )
      Alan R. Griffith    )   Directors
      J. Carter Bacot     )