Number B-1                                                           $50,000,000


                                       APS
                         ARIZONA PUBLIC SERVICE COMPANY
                              FIRST MORTGAGE BOND,
                              SENIOR NOTE SERIES B

         Arizona Public Service  Company,  a corporation of the State of Arizona
(hereinafter called the Company), for value received,  hereby promises to pay to
THE BANK OF NEW YORK, as Trustee,  or registered  assigns,  the principal sum of
Fifty Million  Dollars on April 1, 1999, and to pay interest  thereon from April
10, 1997 or from the most recent  Interest  Payment Date (as defined below) with
respect to which  interest has been paid or duly provided for,  semianually,  on
April 1 and October 1 in each year (each an "Interest Payment Date"), commencing
October 1, 1997,  at the rate of 6.72% per annum  (calculated  on the basis of a
360-day year of twelve 30-day  months),  until the  principal  hereof is paid or
made  available for payment to the holder of record of this bond on the March 15
or September 15, as the case may be, next preceding such Interest  Payment Date,
unless such day is a legal holiday or a day on which banking institutions in The
City of New York are  authorized  to remain  closed,  in which  case on the next
preceding  day  which  shall  not  be a  legal  holiday  or day  on  which  such
institutions are authorized by law to remain closed. Payment of the principal of
(and  premium,  if any) and  interest on this bond will be made at the office or
agency of the Company  maintained  for that purpose in the Borough of Manhattan,
The City of New York, New York, in such coin or currency of the United States of
America  as, at the time of  payment is legal  tender for  payment of public and
private debts,  provided,  however,  that payment of interest may be made at the
option of the  Company by check  mailed to the  address  of the person  entitled
thereto as such address shall appear on the registration books of the Company.

         This bond shall not become  obligatory  until The Bank of New York, the
Trustee under the Mortgage, or its successor  thereunder,  shall have signed the
form of authentication certificate endorsed hereon.

         IN WITNESS WHEREOF, Arizona Public Service Company has caused this bond
to be  signed  in its  corporate  name  by  its  President  or  one of its  Vice
Presidents  and its  corporate  seal to be  impressed  or  imprinted  hereon and
attested by its Secretary or one of its Assistant Secretaries.


         DATED:  April 10, 1997


                                            ARIZONA PUBLIC SERVICE COMPANY

                                             George A. Schreiber, Jr.
                                            -----------------------------------
                                            Executive Vice President and
                                            Chief Financial Officer


                                            ATTEST:

                                             Nancy C. Loftin
                                            -----------------------------------
                                            Vice President, Chief Legal Counsel
                                            and Secretary

TRUSTEE'S AUTHENTICATION CERTIFICATE

         This  bond  is one of the  bonds,  of  the  series  herein  designated,
described or provided for in the within mentioned Mortgage.

THE BANK OF NEW YORK, AS TRUSTEE


By  Walter N. Gitlin
  ------------------------------
      Authorized Signatory

                         ARIZONA PUBLIC SERVICE COMPANY

                   First Mortgage Bond, Senior Note Series B

         This bond is one of an issue of bonds of the Company issuable in series
and is one of a series known as its First Mortgage Bonds,  Senior Note Series B,
all bonds of all  series  issued  and to be issued  under  and  equally  secured
(except insofar as any sinking or other fund, established in accordance with the
provisions of the Mortgage hereinafter mentioned, may afford additional security
for the bonds of any particular series) by a Mortgage and Deed of Trust (herein,
together with any indenture  supplemental  thereto,  including the  supplemental
indentures  dated as of  December  1,  1947,  April 1, 1949,  February  1, 1950,
December 1, 1950,  February 1, 1953, November 1, 1953, March 1, 1954, October 1,
1957, March 1, 1959, November 1, 1961, June 1, 1962, December 1, 1962, September
1, 1963,  September  1,  1967,  April 1, 1970,  March 15,  1972,  April 1, 1974,
February 15, 1975, June 1, 1975,  November 15, 1975, April 15, 1977, January 15,
1978, March 1, 1979, October 15, 1979, May 15, 1980, February 2, 1982, April 15,
1982, July 1, 1983,  October 15, 1983,  June 15, 1984,  January 15, 1985, May 1,
1985, June 1, 1985,  November 1, 1985,  January 15, 1986,  March 1, 1986, May 1,
1986, February 1, 1987, June 1, 1987, November 15, 1987, April 1, 1989, February
15, 1990,  May 15, 1990,  April 15, 1991,  December 15, 1991,  January 15, 1992,
March 1, 1992, June 15, 1992,  February 1, 1993, August 1, 1993, August 1, 1993,
September 15, 1993, March 1, 1994,  November 15, 1996, and April 1, 1997, called
the Mortgage)  dated as of July 1, 1946,  executed by the Company to The Bank of
New York, as Trustee. Reference is made to the Mortgage for a description of the
property  mortgaged  and  pledged,  the nature and extent of the  security,  the
rights of the  holders of the bonds and of the Trustee in respect  thereof,  the
duties and immunities of the Trustee,  the terms and  conditions  upon which the
bonds are and are to be secured,  and the  circumstances  under which additional
bonds may be issued. With the consent of the Company and to the extent permitted
by and as provided in the Mortgage,  the rights and  obligations  of the Company
and/or the rights of the holders of the bonds and/or the terms and provisions of
the Mortgage may be modified or altered by affirmative vote of the holders of at
least seventy per centum (70%) in principal amount of the bonds then outstanding
under the  Mortgage  and, if the rights of the holders of one or more,  but less
than all,  series of bonds then  outstanding  are to be  affected,  then also by
affirmative  vote of the  holders  of at  least  seventy  per  centum  (70%)  in
principal  amount of the bonds then outstanding of each series of bonds so to be
affected  (excluding in any case bonds disqualified from voting by reason of the
Company's interest therein as provided in the Mortgage);  provided that, without
the consent of the holder  hereof,  no such  modification  or alteration  shall,
among other things,  impair or affect the right of the holder to receive payment
of the principal of and interest on this bond and other amounts, if any, payable
upon the  redemption  hereof on or after  the  respective  due  dates  expressed
herein,  or permit  the  creation  of any lien equal or prior to the lien of the
Mortgage  or deprive the holder of the  benefit of a lien on the  mortgaged  and
pledged property.

         The Company has issued Fifty Million Dollars ($50,000,000) in aggregate
principal  amount of its 6.72%  Senior  Notes  Due 1999 (the  "Senior  Notes Due
1999") pursuant to the provisions of the Indenture dated as of November 15, 1996
(the "Senior Note Indenture"),  between the Company and The Bank of New York, as
trustee (said trustee or any successor  trustee under the Senior Note  Indenture
being hereinafter referred to as the "Senior Note Trustee"),  as supplemented by
the First Supplemental Indenture,  dated as of November 15, 1996, and the Second
Supplemental  Indenture  dated as of April 1, 1997  between  the Company and the
Senior Note Trustee (each,  the "First  Supplemental  Indenture" and the "Second
Supplemental Indenture," and collectively, the "Supplemental Indentures").

         The Company has issued the bonds of this series to secure the Company's
obligation to pay principal,  premium,  if any, and interest on the Senior Notes
Due 1999 prior to the Release Date (as hereinafter defined).

         The  Company's   obligation  to  make  payments  with  respect  to  the
principal, premium and/or interest on the bonds of this series shall be fully or
partially,  as the case may be,  satisfied and discharged to the extent that, at
the time  that any  such  payment  shall be due,  the  corresponding  amount  of
principal of, premium,  if any, and/or interest then due on the Senior Notes Due
1999 shall have been fully or partially paid, as the case may be, or there shall
have been  deposited  with the Senior  Note  Trustee  pursuant  to Section  501,
Section  1103,  Section  1205 or Article  Fourteen of the Senior Note  Indenture
trust funds  sufficient  under the  provisions  of said  Sections and Article to
fully or  partially  pay,  as the  case  may be,  the  corresponding  amount  of
principal,  premium,  if any,  and/or  interest then due on the Senior Notes Due
1999.

         Upon payment of the principal of, premium,  if any, and interest due on
the  Senior  Notes  Due  1999,  whether  at  maturity  or prior to  maturity  by
redemption or otherwise,  or upon provision for the payment  thereof having been
made  in  accordance  with  Section  501 or  Section  1402  of the  Senior  Note
Indenture,  bonds of this

series in a principal  amount equal to the principal  amount of Senior Notes Due
1999 so paid or for which  such  provision  for  payment  has been made shall be
deemed fully paid,  satisfied and discharged and the  obligations of the Company
thereunder  shall  be  terminated  and  such  bonds  of  this  series  shall  be
surrendered  to and  cancelled by the  Trustee.  From and after such date as all
bonds issued under the Mortgage (other than Senior Note First Mortgage Bonds, as
such term is defined in the Senior Note  Indenture)  have been  retired  through
payment,  redemption,  or otherwise  at, before or after  maturity  thereof (the
"Release Date"), the bonds of this series shall be deemed fully paid,  satisfied
and discharged and the obligation of the Company  hereunder shall be terminated.
On the  Release  Date,  the bonds of this  series  shall be  surrendered  to and
cancelled by the Trustee.

         This  bond  is  transferable  as  prescribed  in  the  Mortgage  by the
registered owner hereof in person,  or by his duly authorized  attorney,  at the
office or agency of the Company or at the office or agency of the Company in the
Borough  of  Manhattan,  The City of New York,  New  York,  upon  surrender  and
cancellation of this bond, and thereupon a new fully registered bond of the same
series for a like principal  amount will be issued to the transferee in exchange
herefor as provided in the Mortgage.

         In the manner  prescribed in the Mortgage,  bonds of this series,  upon
surrender thereof,  for cancellation,  at the office or agency of the Company in
the  Borough  of  Manhattan,  The City of New York,  New York,  together  with a
written  instrument  of transfer,  if required by the Company or by the Trustee,
duly executed by the registered  owner or by his duly authorized  attorney,  are
exchangeable  for a like aggregate  principal amount of bonds in registered form
of the same series of other authorized  denominations.  Bonds of this series are
issuable in  denominations  of One Thousand  Dollars or any  integral  multiples
thereof.

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

         The bonds of this series shall be redeemed,  in whole or in part,  from
time to time, on the date on which a  corresponding  principal  amount of Senior
Notes Due 1999 are  redeemed as provided  in the Senior Note  Indenture  and the
Second Supplemental Indenture upon the Senior Note Trustee's notification of the
Trustee of such redemption,  at a redemption price equal to the redemption price
of such  Senior  Notes Due 1999  being so  redeemed.  Any such  notice  shall be
received by the Trustee no later than 5 days prior to any redemption  date fixed
for the bonds of this series to be  redeemed  and shall  specify  the  principal
amount of such bonds of this series to be redeemed, the redemption date, and the
amount of accrued interest and premium, if any, to be paid thereon.  The Company
shall  deposit in trust with the  Trustee  on the  redemption  date an amount of
money sufficient to pay the principal amount including accrued interest, if any,
and  premium,  if  any,  on the  bonds  of  this  series  to be  redeemed.  Upon
presentation  to the  Trustee  of any bonds of this  series by the  Senior  Note
Trustee for payment,  such bonds of this series so  presented  shall be redeemed
and paid in full.

         In the event the principal of all Senior Notes Due 1999 is declared due
and payable or becomes  automatically due and payable pursuant to Section 602 of
the Senior Note Indenture,  upon the filing with the Trustee of a written demand
for the  acceleration  of the payment of principal of all the bonds,  such bonds
shall become immediately due and payable.

         Redemption  of the  bonds of this  series  shall be  effected,  without
further  notice by the Company to the Trustee,  by the payment by the Company of
the applicable  redemption  price  specified in this bond at the place specified
for payment of principal of and interest on such bonds.

         The Senior  Note  Series B Bonds will not be subject to  prepayment  or
redemption  prior to maturity  except as provided  herein,  notwithstanding  the
provisions  of Section 39 or Section 64 of the  Mortgage,  or with  "Proceeds of
Released Property," as defined in the Mortgage.

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

         The Company  covenants and agrees that,  prior to Release Date, it will
not take any action  (except  as  described  in this bond) that would  cause the
outstanding  principal  amount of the  bonds of this  series to be less than the
then outstanding principal amount of the Senior Notes Due 1999.

         The Company and the Trustee may deem and treat the person in whose name
this  bond is  registered  as the  absolute  owner  hereof  for the  purpose  of
receiving  payment and for all other  purposes,  and neither the Company nor the
Trustee shall be affected by any notice to the contrary.

         No  recourse  shall  be had  for the  payment  of the  principal  of or
interest on this bond against any  incorporator  or any past,  present or future
subscriber to the capital stock, stockholder, officer or director of the Company
or of any  predecessor or successor  corporation,  as such,  either  directly or
through the Company or any predecessor or successor corporation,  under any rule
of law,  statute or  constitution  or by the  enforcement  of any  assessment or
otherwise,  all such  liability  of  incorporators,  subscribers,  stockholders,
officers  and  directors  being  released  by the holder or owner  hereof by the
acceptance of this bond and being  likewise  waived and released by the terms of
the Mortgage.