EXHIBIT 10.1

                  This  Amendment  No.  3,  dated  as of June 20,  1996,  to the
Amended and Restated Decommissioning Trust Agreement (PVNGS Unit 2), dated as of
January 31, 1992,  as amended by Amendment No. 1 thereto dated as of November 1,
1992  and   Amendment   No.  2  thereto  dated  as  of  November  1,  1994  (the
"Decommissioning  Trust Agreement";  terms used herein as therein  defined),  is
entered into between Arizona Public Service Company  ("APS"),  State Street Bank
and Trust Company,  as successor to The First National Bank of Boston,  as Owner
Trustee  and as Lessor,  and  Mellon  Bank,  N.A.,  as  Decommissioning  Trustee
("Decommissioning Trustee").

                                R E C I T A L S:
                                ----------------

                  WHEREAS,  the  parties  hereto  wish to amend  the  investment
parameters for the  Decommissioning  Trust Fund and the Second Fund contained in
Exhibit B to the Decommissioning Trust Agreement;

                  NOW, THEREFORE,  in consideration of the premises and of other
good and valuable  consideration,  receipt and  sufficiency  of which are hereby
acknowledged, the parties hereto agree as follows:

                              A G R E E M E N T S:
                              --------------------

                  SECTION 1. Amendment.

                  Paragraph  (l)  of  Exhibit  B to  the  Decommissioning  Trust
Agreement is hereby deleted and is replaced in its entirety by the following:

                  (l)      (x) corporate equity securities,  including,  but not
                           limited  to,   investment   in  units  of  common  or
                           collective  trust funds investing in corporate equity
                           securities;   including,  but  not  limited  to,  the
                           Decommissioning   Trustee's  Nuclear  Decommissioning
                           Trust Equity Index Fund (the "NDT Equity Index Fund")
                           and (y)  obligations  not  included  in  clauses  (a)
                           through  (k)  issued  or   guaranteed   by  a  person
                           controlled   or   supervised  by  and  acting  as  an
                           instrumentality  of  the  United  States  of  America
                           pursuant to authority  granted by the Congress of the
                           United   States   of   America,   including   Federal
                           Intermediate  Credit  Bank,  Banks for  Cooperatives,
                           Federal Land Banks,  Federal Home Loan Banks, Federal
                           Home Loan  Mortgage  Corporation;  provided,  that no
                           more than fifty percent (50%) of the aggregate assets
                           of the Funds may be invested in securities  described
                           in (x) and (y) of this  subparagraph  (l)  during the
                           period from June 27, 1996 through  December 31, 2000,
                           no more than forty  percent  (40%)  during the period
                           from  January 1, 2001 through  December 31, 2003,  no
                           more than thirty percent (30%) during the period from
                           January 1, 2004 through  December  31,  2006,  and no
                           more than  fifteen  percent  (15%)  during the period
                           from  January 1, 2007 through  January 31, 2010;  and
                           provided  further  that after  January 31,  2010,  no
                           investments shall be made in such securities.

                  SECTION 2.  Effectiveness.

                  This  Amendment  No. 3 shall  become  effective as of the date
hereof upon the execution and delivery of a counterpart  of this Amendment No. 3
by each of the parties hereto.

                  SECTION 3.  Miscellaneous

                  (a)      Full Force and Effect.

                  Except as expressly provided herein, the Decommissioning Trust
Agreement shall remain unchanged and in full force and effect. Each reference in
the  Decommissioning  Trust Agreement and in any exhibit or schedule  thereto to
"this Agreement," "hereto," "hereof" and terms of similar import shall be deemed
to refer to the Decommissioning Trust Agreement as amended hereby.

                  (b)      Counterparts.

                  This  Amendment  No.  3 may  be  executed  in  any  number  of
counterparts,  all of which taken  together  shall  constitute  one and the same
instrument,  and any of the parties  hereto may execute this  Amendment No. 3 by
signing any such counterpart.

                  (c)      Arizona Law.

                  This Amendment No. 3 shall be construed in accordance with and
governed by the law of the State of Arizona.

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Amendment No. 3 to the Decommissioning Trust Agreement to be duly executed as of
the day and year first above written.

                                     ARIZONA PUBLIC SERVICE COMPANY


                                     By   N.E. Newquist
                                        ----------------------------------------

                                     Title   Treasurer
                                          --------------------------------------


                                     MELLON BANK N.A., as
                                     Decommissioning Trustee


                                     By     Earl G. Kleckner
                                       -----------------------------------------

                                     Title    Vice-President
                                          --------------------------------------
                                      -2-


                      STATE STREET BANK AND TRUST COMPANY,
                      as Owner  Trustee  under a Trust  Agreement  with Security
                      Pacific Capital Leasing  Corporation and as Lessor under a
                      Facility Lease with Arizona Public Service Company


                      By  Mark Nelson
                        --------------------------------------------------------
                      Title   Vice President
                           -----------------------------------------------------

                      STATE STREET BANK AND TRUST COMPANY,
                      as Owner  Trustee  under a Trust  Agreement  with  Emerson
                      Finance  Co.  and as Lessor  under a  Facility  Lease with
                      Arizona Public Service Company


                      By  Mark Nelson
                        --------------------------------------------------------
                      Title    Vice President
                           -----------------------------------------------------


STATE OF ARIZONA               )
                               )  ss.
County of Maricopa             )

                  The foregoing  instrument was acknowledged before me this 27th
day of June, 1996, by Nancy E. Newquist, the Treasurer of ARIZONA PUBLIC SERVICE
COMPANY, an Arizona corporation, on behalf of said corporation.

                                      Maria R. Marrs
                                      ------------------------------------------
                                      Notary Public

My commission expires:
   July 21, 1998
- ---------------------

                                      -3-

STATE OF PA                         )
                                    )  ss.
County of Allegheny                 )

                  The foregoing  instrument was acknowledged before me this 25th
day of June,  1996, by Earl  Kleckner,  a Trust Officer of MELLON BANK,  N.A., a
corporation having trust powers, as Decommissioning  Trustee,  on behalf of said
corporation.

                                      Denise A. Fuhrer
                                      ------------------------------------------
                                      Notary Public

My commission expires:
   December 3, 1998
- ----------------------



STATE OF MASSACHUSETTS              )
                                    )  ss.
County of Suffolk                   )

                  The foregoing  instrument was acknowledged before me this 26th
day of June,  1996, by Mark Nelson,  the Vice President of STATE STREET BANK AND
TRUST COMPANY, a Massachusetts  trust company,  in its capacity as Owner Trustee
under a Trust Agreement with Security Pacific Capital Leasing  Corporation,  and
as Lessor under a Facility Lease with Arizona Public Service Company,  on behalf
of said association in such capacities.

                                      Scott Knox
                                      ------------------------------------------
                                      Notary Public

My commission expires:
     July 12, 2002
- -----------------------

                                      -4-



STATE OF MASSACHUSETTS              )
                                    )  ss.
County of Suffolk                   )

                  The foregoing  instrument was acknowledged before me this 26th
day of June 1996,  by Mark Nelson the Vice  President  of STATE  STREET BANK AND
TRUST COMPANY, a Massachusetts  trust company,  in its capacity as Owner Trustee
under a Trust Agreement with Emerson Finance Co., and as Lessor under a Facility
Lease with Arizona Public Service Company, on behalf of said association in such
capacities.

                                      Scott Knox
                                      ------------------------------------------
                                      Notary Public

My commission expires:
     July 12, 2002
- -----------------------

                                      -5-