Memorandum of Agreement

This  Memorandum of Agreement is made with an Effective  Date of April 25, 1998,
between Arizona Public Service Company (hereinafter referred to as APS) and Salt
River Project Agricultural  Improvement and Power District (hereinafter referred
to as SRP). By signing this  Memorandum  of  Agreement,  it is the intent of the
parties to bind themselves to certain obligations and to recommend certain items
to their respective governing boards for approval.

The  parties  further  understand  that  apart  from  those  provisions  of this
Memorandum of Agreement which impose bilateral  obligations that can be uniquely
addressed by contract,  the remaining  provisions  relating to  legislation  and
regulatory policies only affect the positions that each party will assert before
these legislative and regulatory  bodies.  They do not and can not prescribe any
particular  outcome to be reached  by said  bodies;  indeed,  in  reaching  this
Memorandum  of  Agreement,  each  party  acknowledges  the  risk  that  any such
legislative and/or regulatory decision may differ significantly from one or more
of the positions outlined herein.

                                    RECITALS

These facts form the basis of this Memorandum of Agreement:

1.      APS is an Arizona  corporation  engaged in the electric utility business
        in the State of Arizona.  One hundred percent of the common stock of APS
        is owned by Pinnacle  West Capital  Corporation  (hereinafter  "Pinnacle
        West").

2.      SRP is an  agricultural  improvement  and power district of the State of
        Arizona and is engaged in the electric  utility business in the State of
        Arizona.

3.      APS and SRP have  characteristics  in common but have also differed on a
        number of issues outlined below.

4.      In 1955 APS and SRP entered into two agreements known as the Territorial
        Agreement (dated August 31, 1955) and the Power  Coordination  Agreement
        (dated  September  15,  1955).   Among  other  things,  the  Territorial
        Agreement provides for exclusive retail electric service  territories as
        between  SRP and APS under the policy of the State of Arizona  regarding
        the provision of electricity.  The Power Coordination Agreement provides
        for certain electric system coordination and power sales.

5.      APS and SRP also are  participants  in  several  jointly-owned  electric
        generating  facilities,  some of which are  operated  by APS and some of
        which are operated by SRP.

6.      Many states in the United States,  including Arizona, are enacting rules
        and  legislation  which will  require  electric  utilities to open their
        service  territories to competition in the retail sale of electric power
        supply and other non-distribution services.

7.      The parties wish to amend the Territorial Agreement to eliminate it as a
        barrier  to   competition   in  order  to  permit  full  and  unfettered
        competition between APS and SRP in the sale of electric power supply and
        other  non-distribution  services as  authorized  or  permitted  by law,
        according to such time  schedules and terms that are applicable to other
        electricity suppliers.

8.      Disputes   have  arisen   between  the  parties   regarding  the  future
        enforceability   of  the  power   purchase   obligations  of  the  Power
        Coordination  Agreement,  which  the  parties  wish  to  resolve  by  an
        amendment  to the  Power  Coordination  Agreement.  The price set by the
        agreement is currently above market price.  APS has argued,  inter alia,
        that it may terminate  the power  purchase  obligations  on the start of
        retail competition arguing that the power purchase  obligations are tied
        to the  exclusive  right to serve certain  territories.  SRP has argued,
        inter alia,  that the wording  and intent of the  agreement  is that the
        power purchase  obligation  will  continue.  The parties wish to resolve
        this dispute by adjusting the terms of the Power Coordination Agreement.

9.      The parties have  identified  certain  operational  opportunities  which
        would give a net benefit to both parties,  and that they wish to address
        through the framework of this Memorandum of Agreement.

10.     Other  disputes  have arisen  between the parties  which result from the
        transition to a competitive  electricity  market,  and which the parties
        wish to settle by this Memorandum of Agreement.

11.     The parties wish to permit  vigorous and full  competition  between them
        under the terms and conditions of applicable laws.

12.     The parties wish to resolve the other issues  identified herein so as to
        permit such competition to take place in a fair and equitable manner and
        at the earliest practical date.
                                                                          Page 2

                                    AGREEMENT

Now, therefore, the parties agree as follows:

1. Amendment of Territorial Agreement

SRP and APS agree to present to their governing  boards at the first  reasonable
opportunity,  and to recommend that their  governing  boards  approve,  a second
amendment to the  Territorial  Agreement in the form attached  hereto as Exhibit
One. It is the intent of this  amendment to change the terms of the  territorial
agreement only to the extent necessary to permit full and unfettered competition
between  APS and SRP,  on the same terms as may be  applicable  to other  retail
electricity  suppliers who sell into the  distribution  territory of APS or SRP.
With this  amendment,  the parties  reaffirm the Territorial  Agreement.  In the
event that the  amendment set forth as Exhibit One is not approved by the SRP or
APS governing board,  then the parties shall renegotiate in good faith the terms
of this  entire  Memorandum  of  Agreement,  with the  objective  of  reaching a
substitute  agreement  acceptable to the governing  boards of each party. If the
parties are unable to reach an  agreement  in such  event,  this  Memorandum  of
Agreement may be terminated by either party by written notice to the other.

2. Amendment of the Power Coordination Agreement

SRP and APS agree to present to their governing  boards at the first  reasonable
opportunity,  and to recommend that their governing boards approve, an amendment
to Service Schedule A of the Power  Coordination  Agreement in the form attached
hereto as Exhibit  Two.  With this  amendment,  the parties  reaffirm  the Power
Coordination Agreement. In the event that the amendment set forth as Exhibit Two
is not  approved  by the SRP or APS  governing  board,  then the  parties  shall
renegotiate in good faith the terms of this entire Memorandum of Agreement, with
the  objective of reaching a substitute  agreement  acceptable  to the governing
boards of each party.  If the parties are unable to reach an  agreement  in such
event, this Memorandum of Agreement may be terminated by either party by written
notice to the other.

3. Identification of Future Savings

The  parties  agree to use  their  best  efforts  to  execute  an  agreement  or
agreements  by October 15, 1998,  providing  for the  implementation  of various
measures  that will  provide APS and SRP each with net cost  savings of at least
$15 million in net present value  (calculated  at an 8.7% discount rate) between
January 1, 1999 and December 31, 2006. Such measures may include,  but shall not
be limited to , joint generation operation, fuel procurement activity,  spinning
reserves,  scheduling of the APA load/Hoover  generation,  the use of additional
delivery  points  for  transmission,  future  joint  ventures,  trenching  cable
replacement  programs,  and  other  beneficial  generation,   distribution,  and
transmission  activities.  The  appropriate  senior  executives from APS and SRP
shall personally
                                                                          Page 3

participate  in the  efforts  to reach  such an  agreement,  shall meet at least
weekly,  and  shall  devote  such  resources  as are  necessary  for  successful
completion of the task.

4. Dispute Resolution

With respect to all future  substantive  disputes which reasonably relate to the
subject matter of this Memorandum of Agreement, and which are not covered by any
other  agreement  between  APS and SRP,  the  parties  will,  where  lawful  and
reasonably  feasible,  meet and confer and  attempt in good faith to resolve any
such matters, before taking a public position on the matter.

5. State Political Issues

With respect to state issues  relating to  competition  between public power and
investor owned  utilities,  at this time the parties have reached these specific
agreements:

         a. The parties  will  jointly  support an  amendment  of HB 2663 on the
         Senate  floor or  otherwise,  as has been  previously  agreed to by the
         parties  and  will  support  passage  of HB  2663  as so  amended.  The
         amendment is attached as Exhibit Three. The parties agree to reasonably
         cooperate  with each  other in the  event of  political  difficulty  in
         advancing part or all of the amendment. If HB 2663 as so amended is not
         enacted into law, the parties agree to jointly  support passage of such
         legislation in the future.

         b. SRP will not take a position  on  additional  amendments  to HB 2663
         which may be proposed by APS, as have been previously disclosed to SRP,
         relating to Title 40 waivers and electric and irrigation districts.

         c. APS will support the development of an  intergovernmental  agreement
         between  the  Corporation  Commission  and  SRP  which  will  primarily
         coordinate  the  activities of the  Commission and SRP in opening SRP's
         service  territory  and the service  territory  of APS and other public
         service corporations to electricity competition.

         d. Upon request APS shall provide SRP with an estimated amount of APS's
         remaining  total stranded cost compiled using  assumptions  and methods
         both  parties  find  reasonably  acceptable,  the  amount of APS's then
         unrecovered  regulatory  assets  pursuant to ACC decision number 59601,
         and  information  regarding  the  implementation  of any stranded  cost
         recovery  mechanism  approved by the ACC. APS further agrees that while
         such  regulatory  assets are being  recovered as part of its customers'
         bills,  said bills shall  disclose that  regulatory  asset  recovery is
         contained therein.
                                                                          Page 4

         e. APS and SRP will support  constitutional and legislative  amendments
         that eliminate unnecessary regulation of competitive electric services,
         but  still  provide  for  effective  state   certification   of  retail
         electricity suppliers.

         f. SRP will  propose  and  continue  to  support  before  its  Board of
         Directors,  and APS will  continue to propose  and  support  before the
         Arizona Corporation Commission, the stranded cost methodology described
         in Exhibit 4. The parties  understand that the ultimate  decisions will
         be  made  by the  SRP  governing  board  and  the  Arizona  Corporation
         Commission.

         g Neither APS nor Pinnacle West will knowingly participate, financially
         or otherwise, with any splinter group or organization which is designed
         for  the  overriding  purpose  of  taking  a  position  adverse  to the
         generally  known or  understood  interests of SRP at the state or local
         level.  SRP will not knowingly  participate,  financially or otherwise,
         with any  splinter  group or  organization  which is  designed  for the
         overriding  purpose of taking a position adverse to the generally known
         or  understood  interests  of APS at the  state  or  local  level.  The
         requirements  of this Section 5(g) shall begin on the Effective Date of
         this Memorandum of Agreement and shall end on December 31, 2006.

         h.  APS  will  not  take a  position  before  the  Arizona  Corporation
         Commission  on  efforts  by SRP or its  affiliate  New West  Energy  to
         compete in the current markets of public service corporations, nor will
         APS  challenge  the right of SRP and New West  Energy to compete in the
         current  markets  of  public  service   corporations  or  public  power
         entities.  SRP will not challenge the right of APS (or its  affiliates)
         to compete in the current  markets of public  service  corporations  or
         public power entities.  However, nothing in this section shall preclude
         either party from raising issues  regarding the terms and conditions of
         competitive  entry  which  are  generally   applicable  to  electricity
         suppliers,   or  the  other  party's  compliance  with  laws  generally
         applicable to electricity suppliers.

         i.  Neither APS nor SRP shall take any public  position on state issues
         contrary  to  the  specific  terms  or  the  manifest  spirit  of  this
         Memorandum of Agreement, or attempt to change the fundamental structure
         or  powers  of the  other,  as  existing  on the  Effective  Date.  The
         requirements  of this Section 5(i) shall begin on the Effective Date of
         this Memorandum of Agreement and shall end on December 31, 2006.

6. Federal Political Issues

With respect to federal issues relating to competition  between public power and
investor owned  utilities,  at this time the parties have reached these specific
agreements:
                                                                          Page 5

         a. In a timely manner upon  execution of this  Memorandum of Agreement,
         APS will  prepare a letter to Senator  Frank  Murkowski  satisfactorily
         indicating  that  SRP and APS  have  resolved  differences  related  to
         capital  cost  issues,  and  indicating  that APS will not oppose those
         private use regulations currently pending before IRS.

         b. In a timely manner upon  execution of this  Memorandum of Agreement,
         APS and SRP will jointly  communicate,  and make joint personal  visits
         where appropriate,  with trade association(s) and federal policy makers
         to be  reasonably  identified  by SRP. APS will convey the messages set
         forth in point (a) above.

         c. Beginning on the Effective Date of this Memorandum of Agreement, APS
         and SRP will  affirmatively  support  the  right of  public  power  and
         investor-owned  utilities to seek tax-exempt pollution control bonds to
         the same degree in the  future,  as that issue may arise at the federal
         level during deliberations on electric industry deregulation.

         d. APS and SRP will work  together to  facilitate  the  formation of an
         interim  organization  for purposes of auditing  system  operations and
         resolving system  constraints on the Arizona  transmission  system. The
         employees  of  this  organization  would  report  to a  subset  of  the
         Southwest Regional  Transmission  Association until Desert Star or some
         other independent system operator  mechanism is satisfactorily  defined
         and in operation. The parties will financially support the formation of
         said  organization  and will propose that the costs of  organizing  and
         operating  the  transition  organization  will be shared by all Arizona
         market participants.

         e.  Neither  APS  nor  Pinnacle   West  will   knowingly   participate,
         financially or otherwise, with any splinter group or organization which
         is designed for the overriding  purpose of taking a position adverse to
         the  generally  known or  understood  interests  of SRP at the  federal
         level.  SRP will not knowingly  participate,  financially or otherwise,
         with any  splinter  group or  organization  which is  designed  for the
         overriding  purpose of taking a position adverse to the generally known
         or understood  interests of APS at the federal level.  The requirements
         of  this  Section  6(e)  shall  begin  on the  Effective  Date  of this
         Memorandum of Agreement and shall end on December 31, 2006.

         f. APS  will  limit  its  comments  to the  Federal  Energy  Regulatory
         Commission in regard to SRP's safe harbor filing to concerns related to
         code of conduct  issues,  and will otherwise  indicate that it takes no
         exception in that proceeding to the economic issues therein.

         g. Neither APS nor SRP shall take any public position on federal issues
         contrary  to  the  specific  terms  or  the  manifest  spirit  of  this
         Memorandum of 
                                                                          Page 6

         Agreement,  or attempt to change the fundamental structure or powers of
         the other, as existing on the Effective Date. The  requirements of this
         Section 6(g) shall begin on the  Effective  Date of this  Memorandum of
         Agreement and shall end on December 31, 2006.

7. Transmission and Distribution Prices and Terms

To the extent not  contrary to future state or federal  regulatory  requirements
(1)  SRP  and  APS  shall  allow  access  to  their  respective  electric  power
transmission and distribution facilities under rates and terms and conditions of
service  that  are  nondiscriminatory,  cost  based,  just and  reasonable,  and
comparable to those charged by themselves  respectively for their own use of the
same  facilities,  (2) in  determining  rates  and  terms  of  transmission  and
distribution  service,  SRP shall  follow  the  procedures  set forth in Exhibit
Three, and (3) SRP shall propose and advocate pricing for transmission  services
that utilizes pricing  procedures and methodologies  that conform to the Federal
Power Act and the Federal Energy Regulatory  Commission's  applicable  published
decisions,  policies and  regulations,  to the extent  legally  possible.  SRP's
proposed  rates and terms  and  conditions  for  distribution  and  transmission
service shall be filed in sufficient time for their adoption by January 1, 1999,
or by the  start of  competition  in both the APS and SRP  service  territories,
whichever is later.  APS shall not object to the  inclusion in  transmission  or
distribution rates of costs necessary to support SRP's water delivery operations
in amounts consistent with historic  practices.  APS shall propose  distribution
and transmission  rates and terms and conditions of service  consistent with the
above principles.  However, both parties recognize that such rates and terms and
conditions are subject to regulation by the Arizona  Corporation  Commission and
the Federal Energy Regulatory Commission.

8. Obligation to Meet and Confer

In the event of a claimed  breach of the  provisions  of  Sections 3, 5, or 6 of
this  Memorandum of  Agreement,  the parties,  on demand of either party,  shall
timely meet and attempt, in good faith to resolve the dispute in a timely manner
before instituting litigation.

9. Remedies Upon Breach of This Memorandum of Agreement

         a.  Remedies  for breach of the  obligations  set forth in Section 1 of
         this Memorandum of Agreement:  The only  obligation  under Section 1 of
         this  Memorandum  of Agreement is for the  management of APS and SRP to
         present the  amendment to their  respective  governing  boards.  In the
         event that the amendment is not approved by both governing boards,  the
         parties  shall  attempt  to  renegotiate  this  entire   Memorandum  of
         Agreement, as provided in Section 1.

         b.  Remedies  for breach of the  obligations  set forth in Section 2 of
         this Memorandum of Agreement:  The only  obligation  under Section 2 of
         this
                                                                          Page 7

         Memorandum of Agreement is for the management of APS and SRP to present
         the amendment to their respective  governing  boards. In the event that
         the  amendment is not approved by both  governing  boards,  the parties
         shall attempt to renegotiate  this entire  Memorandum of Agreement,  as
         provided in Section 2.

         c.  Remedies for breach of the  obligations  set forth in Sections 3, 4
         and 8 of this  Memorandum  of Agreement:  Remedies  shall be limited to
         specific enforcement of the obligation or injunctive relief.

         d. Remedies for breach of the obligations set forth in Sections 5 and 6
         of this Memorandum of Agreement:

                  i. Breach by APS - In the case of a material  breach by APS or
                  any action by Pinnacle  West which,  if performed by APS would
                  constitute a material  breach of the  obligations set forth in
                  Sections 5 and 6 of this Memorandum of Agreement,  the changes
                  to  Schedule  A of the Power  Coordination  Agreement,  as set
                  forth in Exhibit Two, shall terminate after APS has been given
                  notice  and has  failed to cure the  material  breach  after a
                  reasonable  opportunity  to do  so.  In  the  event  that  APS
                  disputes  the breach,  then SRP shall  continue to comply with
                  the  changes  to Service  Section A of the Power  Coordination
                  Agreement as set forth in Exhibit Two.  until a final judgment
                  or  resolution  determining  a  material  breach.  Upon  final
                  judgment or resolution determining a material breach, SRP will
                  be owed  damages  from  APS in the  amount  of the  difference
                  between  the  Exhibit Two  prices,  and the  contract  without
                  Exhibit Two, from the date of material  breach until the final
                  judgment or determination.  SRP shall otherwise have no remedy
                  at law or equity for such breach.

                  ii. Breach by SRP - In the case of a material breach by SRP of
                  the  obligations  set  forth  in  Section  5  and  6  of  this
                  Memorandum of Agreement, APS shall have a thirty day option to
                  terminate  Schedule  A of the  Power  Coordination  Agreement,
                  after SRP has been  given  notice  and has  failed to cure the
                  material  breach after a reasonable  opportunity  to do so. In
                  the  event  that SRP  disputes  the  breach,  then  APS  shall
                  continue to comply with  Schedule A until a final  judgment or
                  resolution  determining a material breach. Upon final judgment
                  or resolution  determining a material breach, APS will be owed
                  damages from SRP in the amount of the  difference  between the
                  market prices, and the contract price, from the date of breach
                  until the final judgment or determination. APS shall otherwise
                  have no remedy at law or equity for such material breach.

         e. SRP or APS may bring a judicial  action to enforce Section 7 of this
         Memorandum of Agreement and shall have such remedies as provided by law
         and equity.
                                                                          Page 8

10. Miscellaneous Provisions

         a. The  provisions  hereof shall extend to and bind the  successors and
         assigns  of  the  parties  hereto,   and  those  subsidiaries  of  each
         substantially engaged in the generation, transmission,  distribution or
         sale of electricity.

         b. The failure by SRP or APS at any time or times  hereafter to require
         strict performance by the other of any of the undertakings,  agreements
         or covenants contained in this Memorandum of Agreement shall not waive,
         affect or diminish any right of SRP or APS  hereunder to demand  strict
         compliance  and  performance  therewith.   None  of  the  undertakings,
         agreements  or  covenants  of SRP  and APS  under  this  Memorandum  of
         Agreement  shall be deemed to have been  waived  unless  such waiver is
         evidenced by an instrument in writing signed by the party to be charged
         specifying such waiver.

         c. All notices  shall be in writing and deemed  properly  given or made
         upon receipt if  delivered by  registered  or certified  mail,  postage
         prepaid to the following addresses:

                  If to APS to:

                           Arizona Public Service Company
                           400 North Fifth Street
                           Phoenix, Arizona 85004
                           Attn.  Corporate Counsel
                           Telecopy Number  (602) 250-3002
                           Telephone Number  (602) 250-3252

                  If to SRP to:

                           Salt River Project Agricultural Improvement and
                              Power District
                           P.O. Box 52025
                           Phoenix, Arizona 85072
                           Attn:  Corporate Secretary
                           Telecopy Number  (602) 236-2188
                           Telephone Number (602) 236-5005
                                                                          Page 9

AGREED TO AS OF THE EFFECTIVE DATE:

APS

ARIZONA PUBLIC SERVICE COMPANY


         By       RICHARD SNELL
           ------------------------------
         Richard Snell
         Chairman of the Board

         Date     4/25/98
             ----------------------------


         By       WILLIAM J. POST
           ------------------------------
         William J. Post
         Chief Executive Officer

         Date     4/25/98
             ----------------------------

SRP

SALT RIVER PROJECT AGRICULTURAL
IMPROVEMENT AND POWER DISTRICT


         By       RICHARD H. SILVERMAN
           ------------------------------
         Richard H. Silverman
         General Manager

         Date     April 25, 1998
             ----------------------------
                                                                         Page 10

                                   Exhibit One

                          SECOND SUPPLEMENTAL AGREEMENT
                          -----------------------------

         THIS SECOND SUPPLEMENTAL AGREEMENT,  made by and between ARIZONA PUBLIC
SERVICE COMPANY  ("APS"),  and SALT RIVER PROJECT  AGRICULTURAL  IMPROVEMENT AND
POWER DISTRICT ("SRP");

                                   WITNESSETH:

         WHEREAS,  the parties  hereto  heretofore  entered into an Agreement of
August 31, 1955, providing, inter alia, certain restrictions in regard to areas,
customers and types of electric load to be served by each;

         WHEREAS, the parties executed a Supplemental Agreement,  dated December
1, 1972,  removing any  restrictions  regarding  sales,  donation or delivery of
electric power and energy at wholesale;

         WHEREAS,  the parties  desire to further  amend the Agreement of August
31,  1955,  and  the  December  1,  1972  Supplemental   Agreement  (hereinafter
collectively referred to as the "Agreement");

         NOW,  THEREFORE,  in  consideration  of the  premises,  and  for  other
valuable consideration,  the sufficiency of which is hereby acknowledged by each
party hereto, the parties hereby agree as follows:

                                   AGREEMENT:

         1.  Notwithstanding  any  other  provision  of  the  Agreement  to  the
contrary,  nothing in the Agreement  shall prohibit  either party from providing
any electric supply or other  non-distribution  service to the extent authorized
or  permitted by law. For  purposes of this  Amendment,  the term  "distribution
services"  shall have the  definition  given the term "local  distribution"  and
"local   distribution   ancillary  services"  under  Federal  Energy  Regulatory
Commission order number 888 [Order No. 888, 61 Fed. Reg.
21,540 (May 10, 1996)].

         2. The provisions of Article X of the Agreement  shall not apply to any
electric generation,  transmission or other non-distribution systems, facilities
or assets.

         3. The  provisions of this Second  Supplemental  Agreement  will become
effective as of January 1, 1999.

         4. Except as expressly provided in this Second Supplemental  Agreement,
the Agreement will remain unchanged and in full force and effect.
                                                                         Page 11

         IN WITNESS  WHEREOF,  the  respective  Parties  have caused this Second
Supplemental   Agreement  to  be  executed  on  their  behalf  this  ____day  of
____________, 1998.


                                    ARIZONA PUBLIC SERVICE COMPANY



                                    By _________________________________
                                                  President


ATTEST:

- ----------------------------------
Secretary



                                    SALT RIVER PROJECT AGRICULTURAL 
                                    IMPROVEMENT AND POWER DISTRICT



                                    By _________________________________
                                                  President


ATTEST AND COUNTERSIGN:


- -----------------------------------
Secretary
                                                                         Page 12

                                   Exhibit Two

                                Supplement No. 4
                              to Service Schedule A
                       of the Power Coordination Agreement
                              of September 15, 1955

This Supplement  Number 4 is agreed upon as a part of Service  Schedule A of the
Power Coordination Agreement between Salt River Project Agricultural Improvement
and Power District and Arizona Public Service Company, dated September 15, 1955,
as previously supplemented.

In  consideration  of the  resolution of disputes  between the parties as to the
effect  of the  institution  of  competition  in the  electric  industry  on the
territory and contingent power purchase obligations under the Power Coordination
Agreement  pursuant to the  Memorandum  of Agreement  dated April 25, 1998,  the
parties agree as follows:

1. The Effective Date of this  Supplement No. 4 shall be the later of January 1,
1999,  or the first day of the next month  following  the Start of  Competition,
which is defined as the date upon which both APS and SRP have opened any part of
their retail load to competition in the sale of electricity.

2. The parties confirm the power purchase  obligations and pricing  formulas set
forth in Service  Schedule A, subject only to the demand charges and the revised
methodology of calculating  territorial  equivalent  power capacity set forth in
Attachment One to this  Supplement  No. 4. Beginning on the Effective  Date, and
ending on December 31, 2006,  demand  charges shall be calculated as provided in
Attachment One to this Supplement No. 4. The parties further agree, beginning on
the  Effective  Date,  to calculate  territorial  equivalent  power  capacity as
provided in Attachment One to this Supplement No. 4.

3. If control of APS or Pinnacle West, or any successor to such control pursuant
to this section, changes by merger,  purchase,  acquisition of voting securities
by one or more  affiliated  persons  or  entities,  or other  event or series of
coordinated events, the successor or affiliated successors to such control will,
within  ten  days  after  acquiring  such  control,  deliver  to  SRP a  written
agreement,  reasonably satisfactory to SRP, to be bound by all of the provisions
of the  Memorandum  of  Agreement,  failing which the demand prices agreed to in
this Supplement No. 4 shall thereafter  revert back to the level that would have
been in effect absent this  Supplement No. 4 to Service  Schedule A of the Power
Coordination  Agreement.  For this purpose,  "control"  means  possession of the
power, however exercised and without regard to shareholder meeting requirements,
staggered  terms  of  director  office  or  similar  considerations,  to elect a
majority of the directors of the corporation in question (APS,  Pinnacle West or
successor).
                                                                         Page 13

4.  Beginning on December 31,  2006,  APS shall have an option to terminate  the
territory and  contingent  power  purchase  obligations  upon five years written
notice.

5. SRP may not  exercise  its  existing  three  year  option  to  terminate  the
territory and contingent power purchase  agreement until after December 31, 2003
(which would result in the earliest  possible  termination  date of December 31,
2006).

6. Except as provided herein,  Service  Schedule A, as previously  supplemented,
shall remain in full force and effect.

7. This  Supplement  No. 4 and Schedule A are subject to termination as provided
in the Memorandum of Agreement between APS and SRP dated April 25, 1998.

                                    ARIZONA PUBLIC SERVICE COMPANY



                                    By _________________________________
                                                 President

ATTEST:

- ----------------------------------
Secretary


                                    SALT RIVER PROJECT AGRICULTURAL
                                    IMPROVEMENT AND POWER DISTRICT



                                    By _________________________________
                                                 President


ATTEST AND COUNTERSIGN:

- -----------------------------------
Secretary
                                                                         Page 14

 Attachment One
                                       to
                               Supplement Number 4
                               Service Schedule A
                          Power Coordination Agreement

            Future Capacity Requirements and Estimated Demand Charges
            ---------------------------------------------------------

- --------------------------------------------------------------------------------
  Calendar      Jan-May          Jan-May          June-Dec         June-Dec
    Year       Demand MWs     Demand $/kW-Mo     Demand MWs     Demand $/kW-Mo
- --------------------------------------------------------------------------------
    1999          316              0.79              322             0.87
    2000          322              1.46              329             1.54
    2001          329              2.13              336             2.21
    2002          336              2.81              343             2.87
    2003          343              3.45              350             3.50
    2004          350              4.10              357             4.14
    2005          357              4.48              364             4.52
    2006          364              4.84              372             4.88
- --------------------------------------------------------------------------------

1. This chart is an estimate of future demand  prices.  The estimate is based on
an assumed $5.23 base on January 1, 1999, and an assumed 4.1% annual  escalation
rate thereafter.

2. Actual prices will be adjusted based on the actual  escalation rates pursuant
to Schedule A, Section 8 of the Power Coordination Agreement.

3. The territorial  equivalent  power capacity will be 254 MW beginning with the
6/1/98 - 5/31/99 contract year and will escalate at 2.5%  thereafter,  including
during the periods after December 31, 2006.

4. Until the first of the next month following the Start of Competition,  demand
rates  will be  calculated  according  to  Schedule  A,  Section  8 of the Power
Coordination  Agreement.  The APS demand charge for the revised  billing  period
will be paid monthly. The demand payment will be equal to the territorial demand
plus  the  contingent  demand,  multiplied  by a per  kW  -month  demand  charge
calculated as specified above.

5. The demand  charges after  December 31, 2006 will be calculated  according to
Schedule A, Section 8 of the Power Coordination Agreement.

6. Energy charges are not changed by this Supplement No. 4.
                                                                         Page 15

                                  Exhibit Three



             APS/SRP AMENDMENT TO HB 2663 ELECTRIC POWER COMPETITION

Page 4

     Line 5 after the period insert "NOTWITHSTANDING SECTION 30-803(A), A PUBLIC
          POWER ENTITY MAY  COORDINATE  THE OPENING OF ITS SERVICE  TERRITORY TO
          COMPETITION WITH THE SCHEDULE SET BY THE COMMISSION FOR PUBLIC SERVICE
          CORPORATIONS."

     Between lines 5 and 6 insert "B. WHEN DETERMINING  TERMS AND CONDITIONS FOR
          CUSTOMER  SELECTION,   COMPLAINT   RESOLUTION,   CONSUMER  PROTECTION,
          STRANDED COST,  DISTRIBUTION SERVICE RATES AND CHARGES, SYSTEM BENEFIT
          CHARGES,  AND OTHER RELATED  MATTERS AS  DETERMINED IN THE  REASONABLE
          DISCRETION  OF THE  GOVERNING  BODY OF THE PUBLIC  POWER  ENTITY,  THE
          GOVERNING BODY OF THE PUBLIC POWER ENTITY SHALL, AT A MINIMUM:

          1.   PROVIDE PUBLIC NOTICE OF PROPOSED TERMS AND CONDITIONS STATING:

               a.   THAT THE POWER ENTITY IS ADOPTING  TERMS AND  CONDITIONS FOR
                    COMPETITION  IN  THE  RETAIL  SALE  OF  ELECTRIC  GENERATION
                    SERVICE.

               b.   THAT THE  INFORMATION  IN  SUBSECTION  2 OF THIS  SECTION IS
                    AVAILABLE FOR INSPECTION.

               c.   THAT THE GOVERNING BODY OF THE PUBLIC POWER ENTITY WILL HOLD
                    A  SPECIAL  MEETING  AS  REQUIRED  BY  SUBSECTION  3 OF THIS
                    SECTION AND STATING THE DATE, TIME AND PLACE OF THE MEETING.

          2.   PROVIDE THAT FOR A PERIOD  BEGINNING  WITH THE PUBLIC  NOTICE AND
               UNTIL  TEN DAYS  AFTER  THE CLOSE OF THE  MEETING  PRESCRIBED  IN
               SUBSECTION 3 OF THIS SECTION,  THE PUBLIC POWER ENTITY SHALL MAKE
               AVAILABLE TO INTERESTED  PERSONS,  AT ITS MAIN OFFICE,  PERTINENT
               INFORMATION, INCLUDING:

               a.   MANAGEMENT'S   RECOMMENDATION   FOR   PROPOSED   TERMS   AND
                    CONDITIONS.

               b.   RELEVANT FINANCIAL AND OTHER INFORMATION AS MAY BE PERTINENT
                    AND UPON WHICH THE MANAGEMENT  PROPOSAL IS BASED. THE PUBLIC
                    POWER ENTITY SHALL TIMELY SUPPLEMENT SUCH INFORMATION AS MAY
                    BE REASONABLY REQUESTED BY ANY INTERESTED PERSON AND
                                                                         Page 16

                    WILL ANSWER  REASONABLE  QUESTIONS  POSED BY ANY  INTERESTED
                    PERSON.

               c.   CURRENT TERMS AND CONDITIONS, IF ANY.

               d.   REPORTS OF CONSULTANTS, IF ANY.

          3.   PROVIDE THAT  INTERESTED  PERSONS MAY FILE WRITTEN  COMMENTS WITH
               THE PUBLIC POWER ENTITY AT ANY TIME DURING THE PERIOD  PRESCRIBED
               IN SUBSECTION 2 OF THIS SECTION.  A MEETING OF THE GOVERNING BODY
               OF THE PUBLIC  POWER  ENTITY  SHALL BE HELD NO SOONER THAN THIRTY
               DAYS AND NO LATER  THAN  NINETY  DAYS  AFTER  THE  PUBLIC  NOTICE
               REFERRED TO IN SUBSECTION 1 OF THIS SECTION. AT THE MEETING,  THE
               GOVERNING BODY OF THE PUBLIC POWER ENTITY SHALL:

               a.   AFFORD  REPRESENTATIVES  OF  MANAGEMENT  OF THE PUBLIC POWER
                    ENTITY AN  OPPORTUNITY  TO EXPLAIN  THE  PROPOSED  TERMS AND
                    CONDITIONS,  THE CRITERIA FOR SUCH TERMS AND  CONDITIONS AND
                    ANSWER QUESTIONS.

               b.   AFFORD ANY  CONSULTANTS  RETAINED BY THE PUBLIC POWER ENTITY
                    AN  OPPORTUNITY  TO  COMMENT  UPON THE  PROPOSED  TERMS  AND
                    CONDITIONS.

               c.   AFFORD INTERESTED PERSONS A REASONABLE OPPORTUNITY TO SUBMIT
                    WRITTEN COMMENTS AND QUESTIONS OR MAKE ORAL  PRESENTATION OF
                    VIEWS, QUESTIONS AND COMMENTS.

          4.   FOLLOWING REVIEW OF THE INFORMATION AND COMMENTS  GATHERED IN THE
               COURSE  OF THE  PROCEDURES  DESCRIBED  IN  SUBSECTION  3 OF  THIS
               SECTION THE GOVERNING  BODY OF THE PUBLIC POWER ENTITY SHALL MAKE
               ITS DECISION ON THE PROPOSED TERMS AND CONDITIONS.

     C.   ALL FINAL  DECISIONS OF THE GOVERNING  BODY OF THE PUBLIC POWER ENTITY
          REGARDING  TERMS AND  CONDITIONS  FOR  CUSTOMER  SELECTION,  COMPLAINT
          RESOLUTION,  CONSUMER PROTECTION,  STRANDED COST, DISTRIBUTION SERVICE
          RATES AND CHARGES,  SYSTEM BENEFIT CHARGES,  AND OTHER RELATED MATTERS
          AS DETERMINED IN THE  REASONABLE  DISCRETION OF THE GOVERNING  BODY OF
          THE PUBLIC POWER ENTITY SHALL:

          1. BE IN WRITING
          2. STATE THE FACTUAL AND LEGAL BASIS FOR THE DECISION, AND
          3. STATE THE EFFECTIVE DATE OF THE DECISION, IF ANY.

     Line 12 before the period insert ", TO ELECTRICITY  SUPPLIERS  CERTIFICATED
          BY THE COMMISSION PURSUANT TO SECTION 40-207"

     Line 13 strike "EXISTING", before "SERVICE" insert "EXCLUSIVE DISTRIBUTION"

     Line 17 after "CONTINUE" insert "TO HAVE THE EXCLUSIVE RIGHT"
                                                                         Page 17


     After line 19 insert "D. PUBLIC POWER ENTITIES SHALL PERMIT THE AGGREGATION
          OF LOADS OF MULTIPLE CUSTOMERS."

     Strike lines 20 through 22

Page 5

     Line 11 strike "A PEAK DEMAND OF TWENTY KILOWATTS"; after "WITH" insert "AN
          ANNUAL USAGE OF ONE HUNDRED THOUSAND KILOWATT HOURS"

     Line 20 after "PRACTICES" insert "OF PUBLIC POWER ENTITIES"

Page 6

     Line 21 strike "PEAK DEMAND IS TWENTY"

     Line 22 strike "KILOWATTS" and insert "ANNUAL USAGE IS ONE HUNDRED THOUSAND
          KILOWATT HOURS"

     Line 28  strike  "AGGREGATED  PEAK  LOAD IS TWENTY  KILOWATTS"  and  insert
          "ANNUAL USAGE IS ONE HUNDRED THOUSAND KILOWATT HOURS"

     Line 37 after "FAILURE" insert "OF A PUBLIC POWER ENTITY"

Page 7

     Line 40 strike "AN"; after "GIVE" insert "A MATERIAL"

Page 8

     Line 2  after  the  period  insert  "DETERMINATIONS  MADE BY  PUBLIC  POWER
          ENTITIES  UNDER THIS SECTION MAY BE CHALLENGED  THROUGH THE PROCEDURES
          PROVIDED IN SECTION 39-121.02."

     Between lines 2 and 3 insert three new sections:

     Section ___. Section 30-810, Arizona Revised Statutes is inserted:

     30-810 Application for rehearing; effect; decision

     A.   AFTER ANY FINAL  DECISION IS MADE BY THE GOVERNING  BODY OF THE PUBLIC
          POWER ENTITY  REGARDING  TERMS AND CONDITIONS FOR CUSTOMER  SELECTION,
          COMPLAINT RESOLUTION, CONSUMER PROTECTION STRANDED COSTS, DISTRIBUTION
          SERVICE RATES AND CHARGES,  SYSTEM BENEFIT CHARGES,  AND OTHER RELATED
          MATTERS AS  DETERMINED IN THE  REASONABLE  DISCRETION OF THE GOVERNING
          BODY OF THE PUBLIC  POWER  ENTITY,  OR  REGARDING  COMPLIANCE  WITH AN
          INTERGOVERNMENTAL  AGREEMENT MADE UNDER THE PROVISION OF THIS CHAPTER,
          ANY PARTY TO THE  ACTION OR  PROCEEDING  OR THE  ATTORNEY  GENERAL  ON
          BEHALF OF THE STATE MAY APPLY FOR A REHEARING OF ANY MATTER DETERMINED
          IN THE ACTION OR  PROCEEDING  AND  SPECIFIED  IN THE  APPLICATION  FOR
          REHEARING  WITHIN  TWENTY  DAYS  OF  ENTRY  OF  THE  DECISION.  UNLESS
          OTHERWISE ORDERED, THE FILING OF SUCH AN APPLICATION DOES NOT STAY THE
                                                                         Page 18

          DECISION OF THE  GOVERNING  BODY OF THE PUBLIC  POWER  ENTITY.  IF THE
          GOVERNING  BODY  OF  THE  PUBLIC  POWER  ENTITY  DOES  NOT  GRANT  THE
          APPLICATION  WITHIN TWENTY DAYS, IT IS DEEMED DENIED. IF THE GOVERNING
          BODY OF THE PUBLIC POWER ENTITY GRANTS THE APPLICATION,  THE GOVERNING
          BODY OF THE PUBLIC  POWER ENTITY  SHALL  PROMPTLY  HEAR THE MATTER AND
          DETERMINE IT WITHIN TWENTY DAYS AFTER THE FINAL SUBMISSION.

     B.   NO CLAIM ARISING FROM ANY DECISION OF THE GOVERNING BODY OF THE PUBLIC
          POWER ENTITY  REGARDING  TERMS AND CONDITIONS FOR CUSTOMER  SELECTION,
          COMPLAINT   RESOLUTION,    CONSUMER   PROTECTION,    STRANDED   COSTS,
          DISTRIBUTION  SERVICE RATES AND CHARGES,  SYSTEM BENEFIT CHARGES,  AND
          OTHER RELATED  MATTERS AS DETERMINED IN THE  REASONABLE  DISCRETION OF
          THE GOVERNING BODY OF THE PUBLIC POWER ENTITY, OR REGARDING COMPLIANCE
          WITH AN  INTERGOVERNMENTAL  AGREEMENT MADE UNDER THE PROVISION OF THIS
          CHAPTER SHALL ACCRUE IN ANY COURT TO ANY PARTY,  OR THE STATE,  UNLESS
          THE PARTY,  OR THE STATE,  MAKES,  BEFORE  THE  EFFECTIVE  DATE OF THE
          DECISION, APPLICATION TO THE GOVERNING BODY OF THE PUBLIC POWER ENTITY
          FOR REHEARING.

     C.   THE APPLICATION  SHALL SET FORTH  SPECIFICALLY THE GROUNDS ON WHICH IT
          IS BASED,  AND NO PERSON,  NOR THE  STATE,  SHALL IN ANY COURT URGE OR
          RELY ON ANY GROUND NOT SET FORTH IN THE APPLICATION.

     D.   AN  APPLICATION  FOR  REHEARING  SHALL  NOT  EXCUSE  ANY  PERSON  FROM
          COMPLYING WITH AND OBEYING ANY DECISION,  OR ANY  REQUIREMENTS  OF ANY
          DECISION OF THE GOVERNING  BODY OF THE PUBLIC POWER ENTITY  THERTOFORE
          MADE,  OR OPERATE IN ANY MANNER TO STAY OR  POSTPONE  THE  ENFORCEMENT
          THEREOF,  EXCEPT IN SUCH  CASES AND UPON SUCH  TERMS AS THE  GOVERNING
          BODY OF THE PUBLIC POWER ENTITY DIRECTS.

     E.   IF, AFTER A REHEARING AND A CONSIDERATION OF ALL THE FACTS,  INCLUDING
          THOSE ARISING SINCE THE MAKING OF THE DECISION,  THE GOVERNING BODY OF
          THE PUBLIC POWER  ENTITY FINDS THAT THE ORIGINAL  DECISION OR ANY PART
          THEREOF IS IN ANY RESPECT UNJUST OR UNWARRANTED, OR SHOULD BE CHANGED,
          THE GOVERNING BODY OF THE PUBLIC POWER ENTITY MAY ABROGATE, CHANGE, OR
          MODIFY THE  DECISION,  AND SUCH DECISION HAS THE SAME FORCE AND EFFECT
          AS AN  ORIGINAL  DECISION,  BUT  SHALL  NOT  AFFECT  ANY  RIGHT OR THE
          ENFORCEMENT  OF ANY RIGHT  ARISING  FROM OR BY VIRTUE OF THE  ORIGINAL
          DECISION,  UNLESS SO DECIDED BY THE GOVERNING BODY OF THE PUBLIC POWER
          ENTITY.
                                                                         Page 19

     Section ___. Section 30-811, Arizona Revised Statutes is inserted:

     30-811 Action to set  aside or modify  certain  decisions  of public  power
          entities; filing; limitation; superior court

     A.   ANY PARTY IN INTEREST, OR THE ATTORNEY GENERAL ON BEHALF OF THE STATE,
          BEING  DISSATISFIED WITH A FINAL DECISION BY THE GOVERNING BODY OF THE
          PUBLIC  POWER  ENTITY  REGARDING  TERMS AND  CONDITIONS  FOR  CUSTOMER
          SELECTION, COMPLAINT RESOLUTION,  CONSUMER PROTECTION, STRANDED COSTS,
          DISTRIBUTION  SERVICE RATES AND CHARGES,  SYSTEM BENEFIT CHARGES,  AND
          OTHER RELATED  MATTERS AS DETERMINED IN THE  REASONABLE  DISCRETION OF
          THE GOVERNING BODY OF THE PUBLIC POWER ENTITY, OR REGARDING COMPLIANCE
          WITH AN INTERGOVERNMENTAL  AGREEMENT MADE UNDER THE PROVISIONS OF THIS
          CHAPTER,  MAY  WITHIN  THIRTY  DAYS  AFTER A  REHEARING  IS  DENIED OR
          GRANTED, AND NOT AFTERWARDS,  COMMENCE AN ACTION IN THE SUPERIOR COURT
          IN THE COUNTY IN WHICH THE  GOVERNING  BODY OF THE PUBLIC POWER ENTITY
          HAS ITS OFFICE,  AGAINST THE GOVERNING BODY OF THE PUBLIC POWER ENTITY
          AS A DEFENDANT,  TO VACATE, SET ASIDE, AFFIRM IN PART, REVERSE IN PART
          OR REMAND WITH  INSTRUCTIONS TO THE GOVERNING BODY OF THE PUBLIC POWER
          ENTITY SUCH  DECISION ON THE GROUND THAT THE  VALUATION,  RATE,  JOINT
          RATE, TOLL, FARE, CHARGE OR FINDING, RULE, CLASSIFICATION OR SCHEDULE,
          PRACTICE, DEMAND, REQUIREMENT, ACT OR SERVICE PROVIDED IN THE DECISION
          IS UNLAWFUL,  OR THAT ANY RULE,  PRACTICE,  ACT OR SERVICE PROVIDED IN
          THE DECISION IS UNREASONABLE.  THE ANSWER OF THE GOVERNING BODY OF THE
          PUBLIC POWER ENTITY SHALL BE SERVED AND FILED WITHIN TWENTY DAYS AFTER
          SERVICE OF THE  COMPLAINT,  WHEREUPON THE ACTION SHALL BE AT ISSUE AND
          READY FOR TRIAL  UPON TEN DAYS'  NOTICE TO EITHER  PARTY.  THE  ACTION
          SHALL  BE TRIED  AND  DETERMINED  AS OTHER  CIVIL  ACTIONS  EXCEPT  AS
          PROVIDED IN THIS SECTION.

     B.   IF THE GOVERNING BODY OF THE PUBLIC POWER ENTITY RESCINDS THE DECISION
          COMPLAINED  OF, THE ACTION SHALL BE  DISMISSED,  AND IF THE  GOVERNING
          BODY OF THE  PUBLIC  POWER  ENTITY  ALTERS,  MODIFIES  OR  AMENDS  THE
          DECISION, THE ALTERED,  MODIFIED OR AMENDED DECISION SHALL REPLACE THE
          ORIGINAL  DECISION  COMPLAINED OF, AND JUDGMENT SHALL BE GIVEN THEREON
          AS THOUGH MADE BY THE GOVERNING BODY OF THE PUBLIC POWER ENTITY IN THE
          FIRST INSTANCE.

     C.   THE  TRIAL  SHALL  CONFORM,  AS  NEARLY  AS  POSSIBLE,  AND  EXCEPT AS
          OTHERWISE  PRESCRIBED  BY THIS  SECTION,  TO  OTHER  TRIALS  IN  CIVIL
          ACTIONS. JUDGMENT SHALL BE GIVEN AFFIRMING,
                                                                         Page 20

          MODIFYING OR SETTING ASIDE THE ORIGINAL OR AMENDED DECISION.

     D.   EITHER  PARTY TO THE ACTION  WITHIN  THIRTY DAYS AFTER THE JUDGMENT OF
          THE SUPERIOR COURT IS GIVEN, MAY APPEAL TO THE COURT OF APPEALS.

     E.   IN ALL TRIALS,  ACTIONS AND  PROCEEDINGS  THE BURDEN OF PROOF SHALL BE
          UPON THE PARTY  ADVERSE  TO THE  GOVERNING  BODY OF THE  PUBLIC  POWER
          ENTITY OR  SEEKING  TO VACATE  OR SET ASIDE ANY  DETERMINATION  OF THE
          GOVERNING BODY OF THE PUBLIC POWER ENTITY TO SHOW THAT IT IS UNLAWFUL,
          THAT IS NOT  SUPPORTED BY  SUBSTANTIAL  EVIDENCE OR THAT THE GOVERNING
          BODY OF THE PUBLIC POWER ENTITY ABUSED ITS DISCRETION.

     F.   EXCEPT AS PROVIDED  BY THIS  SECTION NO COURT OF THIS STATE SHALL HAVE
          JURISDICTION  TO  ENJOIN,  RESTRAIN,  SUSPEND,  DELAY  OR  REVIEW  ANY
          DECISION  OF THE  GOVERNING  BODY OF THE PUBLIC  POWER  ENTITY,  OR TO
          ENJOIN  RESTRAIN OR INTERFERE  WITH THE  GOVERNING  BODY OF THE PUBLIC
          POWER ENTITY IN THE PERFORMANCE OF ITS OFFICIAL DUTIES,  AND THE RULES
          OR DECREES  FIXED BY THE  GOVERNING  BODY OF THE PUBLIC  POWER  ENTITY
          SHALL REMAIN IN FORCE  PENDING THE DECISION OF THE COURTS,  BUT A WRIT
          OF MANDAMUS  SHALL LIE FROM THE SUPREME COURT TO THE GOVERNING BODY OF
          THE PUBLIC POWER ENTITY IN CASES AUTHORIZED BY LAW.

     Section ___. Section 30-812, Arizona Revised Statutes is inserted:

     30-812 Application of antitrust statutes

     NOTWITHSTANDING  ANY OTHER  PROVISIONS OF LAW, THE  PROVISIONS OF TITLE 44,
          CHAPTER 10,  ARTICLE 1 SHALL  APPLY TO THE  PROVISION  OF  COMPETITIVE
          ELECTRIC GENERATION SERVICE BY PUBLIC POWER ENTITIES.

Page 11

     Line 31 strike "CURRENT SERVICE";  before  "TERRITORIES"  insert "EXCLUSIVE
          DISTRIBUTION SERVICE"

     Line 38 after "PROVIDE" insert ", ON AN EXCLUSIVE BASIS,"

Page 12

     Line 12 strike "PEAK DEMAND IS TWENTY  KILOWATTS"  and insert "ANNUAL USAGE
          IS ONE HUNDRED THOUSAND KILOWATT HOURS"

     Line 20 strike "PEAK DEMAND IS TWENTY"

     Line 21 strike "KILOWATTS" and insert "ANNUAL USAGE IS ONE HUNDRED THOUSAND
          KILOWATT HOURS"

     Line 36 strike "MAILINGS FOR"

     Strike lines 37 through 41
                                                                         Page 21

Page 13

     Afterline 24  insert  "6.  PERMIT  THE  AGGREGATION  OF LOADS  OF  MULTIPLE
          CUSTOMERS."

     Strike lines 25 through 28.

     Line 35 strike "AGGREGATED PEAK"

     Line 36 strike "LOAD OF TWENTY KILOWATTS";  and insert "ANNUAL USAGE OF ONE
          HUNDRED THOUSAND KILOWATT HOURS"

Page 15

     Line 39 strike "EXCEPT"

     Line 40 strike "TO THE EXTENT  THAT THE  CONDUCT OR  ACTIVITY IS SUBJECT TO
          COMPETITION,"

     Line 43 after  the  period  insert  "THIS  SECTION  SHALL  NOT APPLY TO THE
          PROVISION OF COMPETITIVE ELECTRIC GENERATION SERVICE."

Page 16

     Between lines 32 and 33 insert five new sections:

     Section ___. Section 41-2531,  Arizona Revised Statutes is amended to read:

     41-2531 Definitions

     In this article, unless the context otherwise requires:

     1.   "Bidder  prequalification"  means determining in accordance with rules
          adopted pursuant to this chapter that a prospective  bidder or offeror
          satisfies the criteria for being included on the bidder's list.

     2.   "CONFIDENTIAL  INFORMATION"  MEANS TRADE SECRETS OR OTHER  PROPRIETARY
          INFORMATION  BELONGING TO A COMPETING  BIDDER OR OFFEROR  WHICH IS NOT
          PUBLICLY  KNOWN,  THE DISCLOSURE OF WHICH IS IN THE SOLE DISCRETION OF
          THE  COMPETING  BIDDER OR OFFEROR  AND WHICH IS  INCLUDED  IN A BID OR
          PROPOSAL FOR THE LIMITED  PURPOSE OF  RESPONDING TO THE BID OR REQUEST
          FOR PROPOSAL WITH AN  EXPECTATION OF CONTINUED  PRIVACY.  CONFIDENTIAL
          INFORMATION MAY NOT BE DISCLOSED WITHOUT THE EXPRESS PERMISSION OF THE
          COMPETING BIDDER OR OFFEROR TO WHOM IT BELONGS.

     3.   "Cost-reimbursement   contract"   means  a  contract   under  which  a
          contractor is reimbursed for costs which are reasonable, allowable and
          allocable in accordance  with the contract terms and the provisions of
          this chapter, and a fee, if provided for in the contract.

     4.   "Demonstration  project" means a project in which a vendor  supplies a
          service or material to this state for which the state does not pay but
          for which this state may be obligated to provide  routine support such
          as utility cost and operating personnel.

     5.   "ESSENTIAL  GOODS  AND  SERVICES"  MEANS  THOSE  GOODS  AND  SERVICES,
          INCLUDING THE PROVISION OF ELECTRIC  SERVICE,  WHICH ARE NECESSARY FOR
          THE OPERATION OF GOVERNMENT  
                                                                         Page 22

          AND/OR FOR THE PUBLIC HEALTH,  SAFETY AND WELFARE, AND FOR WHICH IT IS
          PRESUMPTIVE  THAT THE COMPETITIVE  BIDDING PROCESS IS NOT PRACTICAL OR
          ADVANTAGEOUS  TO THE  STATE  AND  FOR  WHICH  THE  COMPETITIVE  SEALED
          PROPOSAL PROCESS SHALL BE USED IN PLACE OF THE COMPETITIVE  SEALED BID
          PROCESS.

     6.   "Established catalogue price" means the price included in a catalogue,
          price list, schedule or other form that:

          (a)  Is  regularly  maintained  by  a  manufacturer,   distributor  or
               contractor.

          (b)  Is either  published or otherwise  available  for  inspection  by
               customers.

          (c)  States prices at which sales are currently or were last made to a
               significant   number  of  any   category   of  buyers  or  buyers
               constituting  the  general  buying  public for the  materials  or
               services involved.

     7.   "Invitation  for  bids"  means  all  documents,  whether  attached  or
          incorporated  by  reference,  which  are used for  soliciting  bids in
          accordance with the procedures prescribed in section 41-2533.

     8.   "Multistep  sealed bidding" means a two phase process  consisting of a
          technical  first phase  composed of one or more steps in which bidders
          submit unpriced  technical  offers to be evaluated by this state and a
          second  phase  in which  those  bidders  whose  technical  offers  are
          determined  to be  acceptable  during the first phase have their price
          bids considered.

     9.   "Paper" means  newspaper,  high grade office paper,  fine paper,  bond
          paper, offset paper,  xerographic paper,  duplicator paper and related
          types of cellulosic  material containing not more than ten per cent by
          weight or volume of noncellulosic material such as laminates, binders,
          coatings or saturants.

     10.  "Paper  product"  means paper items or  commodities,  including  paper
          napkins,  towels,  corrugated  paper and related  types of  cellulosic
          products  containing not more than ten per cent by weight or volume of
          noncellulosic  material  such  as  laminates,   binders,  coatings  or
          saturates.

     11.  "Post-consumer  material"  means a discard  generated by a business or
          residence that has fulfilled its useful life.  Post-consumer  material
          does not include discards from industrial or manufacturing processes.

     12.  "Purchase  description"  means the  words  used in a  solicitation  to
          describe  the  materials,  services or  construction  for purchase and
          includes   specifications   attached  to,  or  made  a  part  of,  the
          solicitation.

     13.  "Recycled  paper" means paper  products  which have been  manufactured
          from  materials  otherwise  destined  for the waste  stream  and which
          contain at least forty per cent recovered wastepaper with ten per cent
          of that being post-consumer material.

     14.  "Request for  information"  means all documents  issued to vendors for
          the sole purpose of seeking  information about the availability in the
          commercial marketplace of materials or services.
                                                                         Page 23

     15.  "Request  for  proposals"  means all  documents,  whether  attached or
          incorporated by reference,  which are used for soliciting proposals in
          accordance with procedures prescribed in section 41-2534.

     16.  "Responsible  bidder or offeror" means a person who has the capability
          to perform the contract requirements and the integrity and reliability
          which will assure  good faith  performance.  IN THE CASE OF  ESSENTIAL
          GOODS AND SERVICES,  RESPONSIBLE BIDDER OR OFFEROR SHALL, IN ADDITION,
          MEAN A PERSON  WHOSE  OFFER  MEETS  MINIMAL  SPECIFIED  STANDARDS  FOR
          QUALITY OF THE GOOD OR SERVICE,  WHO DEMONSTRATES  PROVEN  RELIABILITY
          FOR DELIVERY, WHO OFFERS APPROPRIATE WARRANTIES, GUARANTIES AND RETURN
          POLICIES,  AS APPLICABLE,  WHO POSSESSES RELEVANT INDUSTRY AND PROGRAM
          EXPERIENCE.  IN THE CASE OF ELECTRIC CONTRACTS,  RESPONSIBLE BIDDER OR
          OFFEROR MEANS AN ENTERPRISE WHICH CAN DEMONSTRATE THAT IT POSSESSES OR
          CONTROLS THE REQUIRED  RESOURCES  TO PERFORM ITS  OBLIGATIONS  FOR THE
          TERM OF THE COMMITMENT.

     17.  "Responsive  bidder or offeror" means a person who submits a bid which
          conforms  in all  material  respects  to the  invitation  for  bids or
          request for proposals.

     18.  "Unsolicited  proposal" means a written  proposal that is submitted on
          the initiative of the offeror for the purposes of obtaining a contract
          with this state and which is not in  response  to a formal or informal
          request from this state.

     19.  "Wastepaper"  means  recyclable  paper and paperboard,  including high
          grade office paper,  computer paper,  fine paper,  bond paper,  offset
          paper, xerographic paper, duplicator paper and corrugated paper.

     Section ___. Section 41-2534, Arizona Revised Statutes is amended to read:

     41-2534 Competitive sealed proposals

     A.   If,  under  regulations  promulgated  pursuant  to this  chapter,  the
          director  determines  in writing  that the use of  competitive  sealed
          bidding is either not practicable or not advantageous to this state, a
          contract  may be entered into by  competitive  sealed  proposals.  The
          director may provide by regulation  that it is either not  practicable
          or not  advantageous  to this  state  to  procure  specified  types of
          materials or services by competitive  sealed bidding,  except that the
          competitive  sealed proposal  method may not be used for  construction
          contracts.  COMPETITIVE SEALED PROPOSALS SHALL NOT BE REQUIRED FOR THE
          PURCHASE OF ESSENTIAL GOODS AND SERVICES.

     B.   Proposals shall be solicited through a request for proposals.

     C.   Adequate  public notice of the request for proposals shall be given in
          the same manner as provided in section 41-2533.

     D.   Proposals shall be opened publicly at the time and place designated in
          the   request   for   proposals.   The  name  of  each   offeror   and
          NONCONFIDENTIAL  relevant  information  as is specified by  regulation
          shall be publicly  read and recorded in  accordance  with  regulations
          promulgated by the director.  All other  information  contained in the
          proposals shall be confidential so as to avoid  disclosure of contents
          prejudicial  to competing  offerors  during the process of negotiation
          AND 
                                                                          Page24

          SO AS TO PREVENT  DISCLOSURE  OF TRADE  SECRETS  OR OTHER  PROPRIETARY
          INFORMATION.  The proposals shall be open for public  inspection after
          contract  award.  Except to the extent the bidder  designates  and the
          state concurs,  trade secrets or other  proprietary  data contained in
          the  bid  documents  shall  remain  confidential  in  accordance  with
          regulations  promulgated  by the director.  ANY PERSON WHO  IMPROPERLY
          DISCLOSES  CONFIDENTIAL  INFORMATION  PROVIDED BY  COMPETING  OFFERORS
          SHALL BE SUBJECT TO A CIVIL  FINE OF UP TO $10,000  FOR EACH  IMPROPER
          DISCLOSURE.

     E.   The request for proposals shall state the relative importance of price
          and other  evaluation  factors.  Specific  numerical  weighting is not
          required.

     F.   As  provided  in the  request  for  proposals,  and under  regulations
          promulgated  by  the  director,  discussions  may  be  conducted  with
          responsible  offerors who submit proposals determined to be reasonably
          susceptible   to  being   selected   for  award  for  the  purpose  of
          clarification to assure full  understanding of, and responsiveness to,
          the  solicitation  requirements.   Offerors  shall  be  accorded  fair
          treatment with respect to any  opportunity for discussion and revision
          of proposals,  and such revisions may be permitted  after  submissions
          and before award for the purpose of obtaining  best and final  offers.
          In  conducting  discussions,  there  shall  be no  disclosure  of  any
          information derived from proposals submitted by competing offerors.

     G.   The award shall be made to the  responsible  offeror whose proposal is
          determined in writing to be the most advantageous to this state taking
          into consideration the evaluation factors set forth in the request for
          proposals,  WHICH MAY INCLUDE PRICE OR OTHER  VALUE-RELATED  TERMS AND
          CONDITIONS WHICH, IN THE DIRECTOR'S  DISCRETION,  PROVIDE AN ADVANTAGE
          TO THE  STATE.  No  other  factors  or  criteria  may be  used  in the
          evaluation.  The amount of any applicable transaction privilege or use
          tax of a  political  subdivision  of this  state  is not a  factor  in
          determining  the most  advantageous  proposal if a  competing  offeror
          located  outside this state is not subject to a transaction  privilege
          or use tax of a political subdivision of this state. The contract file
          shall contain the basis on which the award is made.

     Section ___. Section 41-2537, Arizona Revised Statutes is amended to read:

     41-2537 Emergency procurements

     Notwithstanding any other provision of this chapter,  the director may make
          or authorize  others to make emergency  procurements if there exists a
          threat to public health,  welfare,  or safety or if a situation exists
          which makes compliance with section 41-2533 or 41-2534  impracticable,
          unnecessary  or  contrary  to  the  public   interest  as  defined  in
          regulations  promulgated  by the director,  except that such emergency
          procurements  shall be made with such  competition  as is  practicable
          under the  circumstances.  AN  IMMINENT  LOSS OR  SHORTAGE OF ELECTRIC
          POWER SHALL CONSTITUTE AN EMERGENCY  PERMITTING  PURCHASES  OUTSIDE OF
          THE REQUEST FOR PROPOSALS  PROCESS.  PREFERENCE  SHALL BE GIVEN TO THE
          CURRENT  ELECTRIC  POWER  SUPPLIER TO PROVIDE SUCH  ELECTRIC  POWER AS
          SHALL  BE  
                                                                         Page 25

          NECESSARY TO SATISFY THE EMERGENCY  NEED. A written  determination  of
          the basis for the emergency  and for the  selection of the  particular
          contractor shall be included in the contract file.

     Section ___. Section 41-2541, Arizona Revised Statutes is amended to read:

     41-2541 Prequalification of contractors

     Prospective  contractors  may  be  prequalified  for  particular  types  of
          materials,  services  and  construction.  Prospective  contractors  of
          essential goods and services shall be  prequalified  and must be so in
          order to participate  in requests for proposals for electric  service.
          In the case of electric service,  prequalification shall include, at a
          minimum,  a demonstration of the  contractor's  resources that support
          its   commitment   to   serve   electricity,   including   plant   and
          transmission/distribution  rights and proof that it holds all licenses
          and  authorizations  to  serve  the  state  or the  agency  concerned.
          Prospective contractors have a continuing duty to provide the director
          with  information  on any  material  change  affecting  the  basis  of
          prequalification.  Solicitation mailing lists of potential contractors
          shall include the  prequalified  contractors.  Only those  prospective
          contractors of essential goods and services who are prequalified  will
          be included on the  solicitation  mailing list for essential goods and
          services.

     Section ___. Section 41-2546, Arizona Revised Statutes is amended to read:

     41-2546 Multi-term contracts

     A.   Unless otherwise provided by law, a contract for materials or services
          may be entered  into for a period of time up to five years,  as deemed
          to be in the best interest of this state,  if the term of the contract
          and  conditions of renewal or  extension,  if any, are included in the
          solicitation  and monies are  available for the first fiscal period at
          the time of  contracting.  A contract may be entered into for a period
          of  time  exceeding  five  years  if,  under  regulations  promulgated
          pursuant to this chapter, the director determines in writing that such
          a  contract  would  be  advantageous  to this  state.  IN THE  CASE OF
          ESSENTIAL GOODS AND SERVICES, IT IS PRESUMPTIVELY  ADVANTAGEOUS TO THE
          STATE TO ENTER INTO  CONTRACTS  EXCEEDING  FIVE YEARS IN ORDER TO TAKE
          ADVANTAGE OF ECONOMIES  OFFERED UNDER SUCH LONG-TERM  CONTRACTS AND TO
          ENSURE  UNINTERRUPTED  AVAILABILITY  OF ESSENTIAL  GOODS AND SERVICES.
          Payment and performance  obligations for succeeding fiscal periods are
          subject to the  availability and  appropriation  of monies,  EXCEPT AS
          OTHERWISE AGREED IN CONTRACTS FOR ESSENTIAL GOODS AND SERVICES.

     B.   Before the use of a multi-term  contract,  it shall be  determined  in
          writing  that:  1.  Estimated  requirements  cover  the  period of the
          contract and are  reasonable and  continuing.  2. Such a contract will
          serve  the  best  interests  of this  state by  encouraging  effective
          competition or otherwise promoting economies in state procurement.

     C.   If monies are not  appropriated or otherwise made available to support
          continuation  of  performance  in  a  subsequent  fiscal  period,  the
          contract  shall be canceled and the  contractor may only be reimbursed
          for the reasonable  value of any  nonrecurring  
                                                                         Page 26

          costs  incurred  but not  amortized  in the price of the  materials or
          services  delivered  under the  contract  or which are  otherwise  not
          recoverable.   The  cost  of   cancellation   may  be  paid  from  any
          appropriations available for such purposes.

Reference: Senate Commerce and Economic Development Committee Amendment

Page 15

     Strike lines 27 through 28

     Line 15 strike "JUNE 30", replace with "DECEMBER 31"

Page 16

     Strike lines 5 and 6

Page 17

     Line 27 strike "JUNE 30", replace with "DECEMBER 31"

     Strike line 29

     Strike line 33
                                                                         Page 27

                                  Exhibit Four

Stranded costs would be measured during  concurrent  applicable  periods,  in no
event  ending  later  than  December  31,  2006,  for the  respective  utilities
("Transition   Period")  by  comparing  the  respective  utilities'  actual  and
reasonable  generation and  generation-related  costs including purchased power,
cost of capital,  and all mitigation costs during this period, and actual market
prices for the preceding year using a four-step process.

         STEP 1
         ------
         Market  prices will be  determined  by reference to the  California  PX
         market (or some comparable market index). If the California PX price is
         used it will be adjusted for transmission wheeling,  administrative and
         other  applicable  charges,  and  transmission  losses in an attempt to
         determine  the  hourly  market  price  at Palo  Verde.  The  respective
         utilities  will  apply  the  same  market  index  in  determining   any
         applicable stranded cost charges.

         STEP 2
         ------
         Actual  hourly  system loads will be multiplied by hourly market prices
         from Step 1 to determine hourly revenues which could have been produced
         if the  utilities  were to sell their power  supply in the  competitive
         market.  Summation of these hourly  dollar  values will produce  annual
         revenues.

         STEP 3
         ------
         The utilities will determine their actual and reasonable generation and
         generation-related costs including purchased power, cost of capital and
         all mitigation costs, from relevant financial and accounting data.

         STEP 4
         ------
         If the amount of the  utilities'  costs  (Step 3) is  greater  than the
         utilities'  calculated  retail market revenues (Step 2), the difference
         will then be allocated  among the respective  utilities'  rate classes,
         using traditional cost allocation and rate design principles,  and will
         be charged to all customers on a demand and/or energy basis,  depending
         upon the customer's  class.  Such recovery will occur over a concurrent
         period  for the  respective  utilities,  in no event to end later  than
         2006.

For  purposes of this  calculation,  "stranded  costs" will  include  only those
prudent, verifiable and unmitigated costs as defined by each party.

SRP will  propose and support  before its Board of Directors  the stranded  cost
methodology as set forth in this Exhibit.
                                                                         Page 28

APS will  propose and  support  before the Arizona  Corporation  Commission  the
stranded cost methodology as set forth in this Exhibit, except that APS will not
count regulatory assets recovered under existing ACC orders.
                                                                         Page 29