Document:

<PAGE>   1
                                                                   EXHIBIT 10.23

[PINNACLE WEST LETTERHEAD]

CONFIDENTIAL

June 14, 2001

To: Southern California Water Company

The following terms and conditions shall govern this agreement on June 14,
2001, between Southern California Water Company ("SCWC"), and Pinnacle West
Capital Corporation ("PWMT"), whereby SCWC agreed to purchase and receive and
PWMT agreed to sell and deliver energy as follows:

<Table>
<S>       <C>                                          <C>     <C>
SELLER:   Pinnacle West Capital Corporation            BUYER:  Southern California Water Company
          400 N. 5th Street, M/S 9842                          630 E. Foothills Blvd.
          Phoenix, Arizona 85004                               San Dimas, CA 91773-9016

CONFIRM                                                CONFIRM
ADMINISTRATOR: Margie Logan                            ADMINISTRATOR: Raymond P. Juels
               (602) 250-2809 (phone)                                 (909) 394-3600 X 679 (phone)
               (602) 371-5256 (fax)                                   (909) 394-3768 (fax)

PRESCHEDULE:   (602) 250-4371                          PRESCHEDULE:   (909) 280-9411
REAL TIME:     (602) 250-4470                          REAL TIME:     (909) 280-9411

QUANTITY (MW/HR.):  8 Megawatts                        QUANTITY (MWH): 87,168 MWh's
PRICE ($/MWH):      Simple average price of            TYPE OF ENERGY: CAISO Firm with Liquidated
                    $53.00/MWh for the Winter                          Damages.
                    periods listed below.
                    Payment for each year will be
                    based on each Winter period
                    price as follows:
                  Winter Period 1 - $75.00/MWH
                  Winter Period 2 - $48.00/MWH
                  Winter Period 3 - $36.00/MWH

START DATE:         WINTER PERIODS                     END DATE:       WINTER PERIODS
                    Period 1 - November 1, 2001                        March 31, 2002
                    Period 2 - November 1, 2002                        March 31, 2003
                    Period 3 - November 1, 2003                        March 31, 2004
DAY(S) OF WEEK:     Monday through Sunday,             HOURS:          H.E. 0100-2400 Pacific
                    including NERC holidays                            Prevailing Time ("PPT").

DELIVERY POINT:     SP15 (Inter SC Trade) - Dynegy is current SC. SCWC to notify PWMT if
                    SC changes.

TRANSMISSION CONTINGENCIES:   None                     GENERATION CONTINGENCIES: None

ENABLING AGREEMENT: PWMT and SCWC enter into this transaction pursuant to and in accordance with
the WSPP Agreement and Service Schedule C (SSC) of the WSPP Agreement, to which PWMT and
SCWC are parties. Terms used but not defined herein shall have the meanings ascribed to them in the
WSPP Agreement.

ADDITIONAL TERMS: Per attached.

</Table>

<PAGE>   2

                                ADDITIONAL TERMS

SCHEDULING: Preschedules shall be exchanged for all deliveries of energy,
including identifications of receiving and generating control areas under this
Agreement by 11:00 a.m. Pacific Prevailing Time on the last work day observed
by both Parties prior to the scheduled date of delivery. Interchange scheduling
shall be conducted in accordance with Western Systems Power Pool (WSPP)
Operating Procedure No. 1.

SPECIAL PROVISIONS: Deliveries will be made except during interruptions or
reductions which are due to uncontrollable forces as defined in Section 10 of
the Western Systems Power Pool Agreement, dated February 1, 2001, ("WSPP
Agreement"), in which case the obligations of both Parties will be reduced for
the duration of the interruption or reduction.

NERC HOLIDAYS: The following shall be deemed holidays for purposes of this
Agreement: New Year's Day, Memorial Day, Independence Day, Labor Day,
Thanksgiving, and Christmas Day.

ADDITIONAL TERMS AND CONDITIONS: Neither Party shall transfer or assign all or
any part of this Agreement or its rights or obligations hereunder or otherwise
dispose of any right, title or interest herein without the prior written consent
of the other Party, which consent shall not be unreasonably withheld or delayed.
Notwithstanding the foregoing, either Party may, without the need for consent
from the other Party, (a) transfer, pledge, or assign this Agreement as security
for any financing; (b) transfer, assign or delegate this Agreement or its rights
or obligations hereunder to an Affiliate of such party; or (c) transfer, assign
or delegate this Agreement to any person or entity succeeding to all or
substantially all of the assets of such party; PROVIDED, HOWEVER, THAT ANY SUCH
ASSIGNEE SHALL AGREE TO BE BOUND BY THE TERMS AND CONDITIONS HEREOF AND,
PROVIDED, FURTHER, THAT ANY TRANSFER, ASSIGNMENT OR DELEGATION THAT DOES NOT
REQUIRE CONSENT HEREUNDER SHALL NOT, IN ANY WAY, RELEASE THE ASSIGNOR FROM
LIABILITY FOR THE FULL PERFORMANCE OF ANY OBLIGATIONS (AND ONLY THOSE
OBLIGATIONS) ARISING UNDER THIS AGREEMENT PRIOR TO THE EFFECTIVE DATE OF THE
TRANSFER, ASSIGNMENT OR DELEGATION. To the extent a transfer does not require
consent, the transferring Party shall provide prompt notice to the other party
of the transfer and the effective date thereof. Any transfer in violation of
this section shall be deemed null and void.

     The definition of Affiliate: "AFFILIATE" means, with respect to any person,
any entity controlled, directly or indirectly, by such person, any entity that
controls, directly or indirectly, such person, or any entity directly or
indirectly under common control with such person. For this purpose, "control" of
any entity or person means ownership of an majority of the voting power of the
entity or person.

     "CAISO ENERGY" means with respect to a Transaction, a Product under which
the Seller shall sell and the Buyer shall purchase a quantity of energy equal to
the hourly quantity without Ancillary Services (as defined in the Tariff) that
is or will be scheduled as a schedule coordinator to schedule coordinator
transaction pursuant to the applicable tariff and protocol provisions of the
California Independent Operator ("CAISO")(as amended from time to time, the
"Tariff") for which the only excuse for failure to deliver or receive is an
"Uncontrollable Force."

A CAISO "Schedule Adjustment", (defined as a schedule change implemented by the
CAISO that is neither caused by, or within the control of, either Party) shall
not constitute an Uncontrollable Force.

<PAGE>   3
      BILLING AND PAYMENT: Monthly billings and payment shall be in accordance
with Section 9 of the WSPP Agreement. Billings and payment shall be sent to:

Pinnacle West Capital Corporation         Southern California Water Company
Attention: Cash Management, Station 9996  Attention: Raymond P. Juels
P. O. Box 53920                           630 E. Foothills Blvd.
Phoenix, AZ 85072-3920                    San Dimas, CA 91773-9015

PWMT Contract No. 62803 shall be included on all correspondence or invoices in
reference to this agreement.

If the above accurately reflects the terms and conditions of the agreement
between PWMT and SCWC on June 14, 2001, please sign a copy of this Agreement and
return it via fax to the PWMT Confirm Administrator listed above.

PINNACLE WEST CAPITAL CORPORATION         SOUTHERN CALIFORNIA WATER COMPANY

Signature: /s/ DAVID A. HANSEN            Signature: /s/ JOEL A. DICKSON
          ----------------------------              ----------------------------

Print Name:    David A. Hansen            Print Name:    Joel A. Dickson
           ---------------------------               ---------------------------

Title:   Director, Marketing & Trading    Title:         Vice President
      --------------------------------          --------------------------------

Date:    6-15-01                          Date:          6/14/01
     ---------------------------------         ---------------------------------

<PAGE>   4
                                  CERTIFICATE
                                       OF
                              CORPORATE SECRETARY

The undersigned, McClellan Harris III, hereby certifies:

     (1)  That he is the duly elected, qualified and acting Corporate Secretary
          of Southern California Water Company, a California corporation; and

     (2)  That Joel A. Dickson, in his capacity as an executive officer of
          Southern California Water Company, is authorized by the Bylaws of
          Southern California Water Company, to execute that agreement styled
          as PWMT Contract No. 62803 dated June 14, 2001, relating to the
          purchase and receipt by Southern California Water Company of electric
          energy delivered and sold by Pinnacle West Capital Corporation; and

     (3)  That the authority granted by the Bylaws of Southern California Water
          Company is currently in full force and effect.

     WITNESS, the hand of the undersigned and the seal of said Corporation this
     14th day of June 2001.

                                        [SIGNATURE ILLEGIBLE]
                                        --------------------------------------
                                        Corporate Secretary

(SEAL)<PAGE>   1
Western Systems Power Pool                                         Exhibit 10.24
Rate Schedule FERC No. 6

                           WESTERN SYSTEMS POWER POOL
                                    AGREEMENT

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   2
Western Systems Power Pool                               Original Sheet No. 1
Rate Schedule FERC No. 6

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
<S>     <C>                                                                     <C>
1.      PARTIES..................................................................4

2.      RECITALS.................................................................4

3.      AGREEMENT................................................................5

4.      DEFINITIONS..............................................................5

5.      TERM AND TERMINATION....................................................11

6.      SERVICE SCHEDULES AND WSPP DEFAULT TRANSMISSION TARIFF..................12

7.      HUB AND OPERATING AGENT.................................................13

8.      ORGANIZATION AND ADMINISTRATION.........................................16

9.      PAYMENTS................................................................20

10.     UNCONTROLLABLE FORCES...................................................22

11.     WAIVERS.................................................................24

12.     NOTICES.................................................................24

13.     APPROVALS...............................................................25

14.     TRANSFER OF INTEREST IN AGREEMENT.......................................27

15.     SEVERABILITY............................................................28

16.     MEMBERSHIP..............................................................28

17.     RELATIONSHIP OF PARTIES.................................................29

18.     NO DEDICATION OF FACILITIES.............................................30
</TABLE>

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   3
Western Systems Power Pool                                  Original Sheet No. 2
Rate Schedule FERC No. 6

<TABLE>
<CAPTION>
<S>     <C>                                                                     <C>
19.     NO RETAIL SERVICES......................................................30

20.     THIRD PARTY BENEFICIARIES...............................................30

21.     LIABILITY AND DAMAGES...................................................30

22.     DEFAULT OF TRANSACTIONS UNDER THIS AGREEMENT AND
        CONFIRMATION AGREEMENTS.................................................34

23.     OTHER AGREEMENTS........................................................43

24.     GOVERNING LAW...........................................................43

25.     JUDGMENTS AND DETERMINATIONS............................................43

26.     COMPLETE AGREEMENT......................................................44

27.     CREDITWORTHINESS........................................................44

28.     NETTING AND SET-OFF.....................................................46

29.     TAXES...................................................................47

30.     CONFIDENTIALITY.........................................................48

31.     TRANSMISSION TARIFF.....................................................49

32.     TRANSACTION SPECIFIC TERMS AND ORAL AGREEMENTS..........................49

33.     PERFORMANCE, TITLE, AND WARRANTIES FOR TRANSACTIONS
        UNDER SERVICE SCHEDULES.................................................52

34.     DISPUTE RESOLUTION......................................................53

35.     FORWARD CONTRACTS.......................................................56
</TABLE>

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   4
Western Systems Power Pool                             First Revised Sheet No. 3
Rate Schedule FERC No. 6                        Superseding Original Sheet No. 3

<TABLE>
<CAPTION>
<S>     <C>                                                                     <C>
36.     TRADE OPTION EXCEPTION..................................................56

37.     ADDITIONAL REPRESENTATIONS AND WARRANTIES...............................57

38.     AMENDMENT...............................................................58

39.     EXECUTION BY COUNTERPARTS...............................................58

40.     WITNESS.................................................................59
</TABLE>

EXHIBIT A:     NETTING

EXHIBIT B:     FORM OF COUNTERPARTY GUARANTEE AGREEMENT

EXHIBIT C:     SAMPLE FORM FOR CONFIRMATION

EXHIBIT D:     WSPP MEDIATION AND ARBITRATION PROCEDURES

SERVICE SCHEDULES

        A.     ECONOMY ENERGY SERVICE

        B.     UNIT COMMITMENT SERVICE

        C.     FIRM CAPACITY/ENERGY SALE OR EXCHANGE SERVICE

LIST OF MEMBERS

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2001
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued November 2, 2000.
<PAGE>   5
Western Systems Power Pool                                  Original Sheet No. 4
Rate Schedule FERC No. 6

1.      PARTIES:

               The Parties to this Western Systems Power Pool Agreement
               (hereinafter referred to as "Agreement") are those entities that
               have executed this Agreement, hereinafter sometimes referred to
               individually as "Party" and collectively as "Parties," but
               excluding any such entity that withdraws its participation in the
               Agreement.

2.      RECITALS:

        2.1    The WSPP experiment has been successfully concluded. Its main
               purpose was to determine the feasibility of a marketing
               arrangement which would increase the efficiency of interconnected
               power system operations above that already being accomplished
               with existing agreements through increased market knowledge and
               market pricing of commodities.

        2.2    The Parties now desire to proceed with a similar marketing
               arrangement on a long term basis for prescheduled and real-time
               coordinated power transactions, such as economy energy
               transactions, unit commitment service, firm system
               capacity/energy sales or exchanges. Accordingly, this Agreement,
               together with any applicable Confirmation Agreement, sets forth
               the terms and conditions to implement these services within any
               applicable rate ceilings set forth in the Service Schedules in
               conformance with FERC orders where applicable.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   6
Western Systems Power Pool                                  Original Sheet No. 5
Rate Schedule FERC No. 6

        2.3    Each Party meets the membership requirements set out in Section
               16.

        2.4    The Parties are willing to utilize their respective electric
               generation and transmission systems or contractual rights thereto
               to the extent of their respective obligations which are set forth
               in this Agreement.

3.      AGREEMENT:

               In consideration of the mutual covenants and promises herein set
               forth, the Parties agree as follows:

4.      DEFINITIONS:

               The following terms, when used herein with initial
               capitalization, whether in the singular or in the plural, shall
               have the meanings specified:

        4.1    Agreement: This Western Systems Power Pool Agreement, including
               the Service Schedules and Exhibits attached hereto, as amended;
               provided, however, that Confirmation Agreements are not included
               within this definition.

        4.1a   Business Day(s): Any day other than a Saturday or Sunday or a
               national (United States or Canadian, whichever is applicable)
               holiday. United States holidays shall be holidays observed by
               Federal Reserve member banks in New York City. Where both the
               Seller and the Purchaser have their principal place of business
               in the United States, Canadian holidays shall not apply.
               Similarly, where both the Seller and the Purchaser have their
               principal place of business in Canada, United States holidays
               shall not apply. In situations where one Party has its principal
               place of business within the United States and the other Party's
               principal place of

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   7
Western Systems Power Pool                             First Revised Sheet No. 6
Rate Schedule FERC No. 6                        Superseding Original Sheet No. 6

               business is within Canada, both United States and Canadian
               holidays shall be observed.

        4.1b   Confirmation Agreement(s): Any oral agreement or written
               documentation for transactions under the Service Schedules which
               sets forth terms and conditions for transactions that are in
               addition to, substitute, or modify those set forth in the
               Agreement. A sample written confirmation document is included as
               Exhibit C. Section 32 of this Agreement provides for such
               Confirmation Agreements. The Parties may agree to modify terms of
               this Agreement for more than one transaction pursuant to a
               separate written agreement. The changes to the Agreement agreed
               to through such written agreements shall be considered part of
               the Confirmation Agreement and shall apply to all transactions
               entered into between the two Parties under the Agreement unless
               the Parties specifically agree to override such changes for a
               particular transaction consistent with Section 32 of this
               Agreement.

        4.1c   Contract Price: The price agreed to between the Seller and the
               Purchaser for a transaction under the Agreement and any
               Confirmation Agreement.

        4.1d   Contract Quantity: The amount of electric energy and/or capacity
               to be supplied for a transaction under a Service Schedule as
               agreed to through any Confirmation Agreement.

        4.2    Control Area: Shall mean an electric system capable of regulating
               its generation in order to maintain its interchange schedule with
               other electric systems and to

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   8
Western Systems Power Pool                                 Original Sheet No. 6A
Rate Schedule FERC No. 6

               contribute its frequency bias obligation to the interconnection
               as specified in the North American Electric Reliability Council
               (NERC) Operating Guidelines.

        4.3    Economy Energy Service: Non-firm energy transaction whereby the
               Seller has agreed to sell or exchange and the Purchaser has
               agreed to buy or exchange energy that is subject to immediate
               interruption upon notification, in accordance with the Agreement,
               including Service Schedule A, and any applicable Confirmation
               Agreement.

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   9
Western Systems Power Pool                          First Revised Sheet No. 7
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 7

        4.4    Electric Utility: An entity or lawful association which (i) is a
               public utility, Independent Power Producer, or Power Marketer
               regulated under applicable state law or the Federal Power Act, or
               (ii) is exempted from such regulation under the Federal Power Act
               because it is the United States, a State or any political
               subdivision thereof or an agency of any of the foregoing, or a
               Rural Utilities Service cooperative, or (iii) is a public
               utility, Independent Power Producer, or Power Marketer located in
               Canada or Mexico that is similarly regulated.

        4.5    Executive Committee: That committee established pursuant to
               Section 8 of this Agreement.

        4.6    FERC: The Federal Energy Regulatory Commission or its regulatory
               successor.

        4.7    Firm Capacity/Energy Sale or Exchange Service: Firm capacity
               and/or energy transaction whereby the Seller has agreed to sell
               or exchange and the Purchaser has agreed to buy or exchange for a
               specified period available capacity with or without associated
               energy which may include a Physically-Settled Option and a
               capacity transaction in accordance with the Agreement, including
               Service Schedule C, and any applicable Confirmation Agreement.

        4.7a   Guarantee Agreement: An agreement providing a guarantee issued by
               a parent company or another entity guaranteeing responsibility
               for specific obligations for transactions under this Agreement
               and Confirmation Agreements. A sample form of guarantee is
               provided in Exhibit B.

        4.7b   Guarantor: The entity providing a guarantee pursuant to a
               Guarantee Agreement.

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   10
Western Systems Power Pool                          First Revised Sheet No. 8
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 8

        4.8    Hub: An electronic communication center that functions as a
               central point to electronically receive and assemble data for
               offers to buy or sell power or transmission service from each
               Party and make that data electronically available concurrently to
               all Parties.

        4.9    Incremental Cost: The forecasted expense incurred by the Seller
               in providing an additional increment of energy or capacity during
               a given hour.

        4.10   Independent Power Producer: An entity which is a non-traditional
               public utility that produces and sells electricity but which does
               not have a retail service franchise.

        4.11   Interconnected Transmission System: The total of all transmission
               facilities owned or operated by the Parties, including
               transmission facilities over which Parties have scheduling
               rights.

        4.11a  Letter of Credit: An irrevocable, transferable, standby letter of
               credit, issued by an issuer acceptable to the Party requiring the
               Letter of Credit.

        4.11b  NERC. North American Electric Reliability Council or any
               successor organization.

        4.12   Operating Agent: Arizona Public Service Company, or its successor
               as may be designated by the Executive Committee.

        4.13   Operating Committee: That committee established pursuant to
               Section 8 of this Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   11
Western Systems Power Pool                               Original Sheet No. 9
Rate Schedule FERC No. 6

        4.14   Power Marketer: An entity which buys, sells, and takes title to
               electric energy, transmission and/or other services from
               traditional utilities and other suppliers.

        4.14a  Physically-Settled Option: Includes (i) a call option which is
               the right, but not the obligation, to buy an underlying power
               product as defined under Service Schedules B or C according to
               the price and exercise terms set forth in the Confirmation
               Agreement; and (ii) a put option which is the right, but not the
               obligation, to sell an underlying power product as defined under
               Service Schedules B or C according to the price and exercise
               terms set forth in the Confirmation Agreement.

        4.14b  Premium: The amount paid by the Purchaser of a Physically-Settled
               Option to the Seller of such Option by the date agreed to by the
               Parties in the Confirmation Agreement.

        4.15   Purchaser: Any Party which agrees to buy or receive from one or
               more of the other Parties any service pursuant to the Agreement
               under any Service Schedule and any applicable Confirmation
               Agreement.

        4.16   Qualifying Facility: A facility which is a qualifying small power
               production facility or a qualifying cogeneration facility as
               these terms are defined in Federal Power Act Sections 3(17)(A),
               3(17)(C), 3(18)(A), and 3(18)(B); which meets the requirements
               set forth in 18 C.F.R. Sections 292.203-292.209; or a facility in
               Canada or Mexico that complies with similar requirements.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   12
Western Systems Power Pool                          First Revised Sheet No. 10
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 10

        4.16a  Replacement Price: The price at which the Purchaser, acting in a
               commercially reasonable manner, effects a purchase of substitute
               electric energy in place of the electric energy not delivered by
               the Seller or, absent such a purchase, the market price for such
               quantity of electric energy, as determined by the Purchaser in a
               commercially reasonable manner, at the delivery point (agreed
               upon by the Seller and the Purchaser for the transaction).

        4.16b  Retail Entity: A retail aggregator or supplier or retail
               customer; provided, however, only those Retail Entities eligible
               for transmission service under the FERC's pro forma open access
               transmission tariff are eligible to become members of the WSPP.

        4.16c  Sales Price: The price at which the Seller, acting in a
               commercially reasonable manner, effects a resale of the electric
               energy not received by the Purchaser or, absent such a resale,
               the market price for such quantity of electric energy at the
               delivery point (agreed upon by the Seller and the Purchaser), as
               determined by the Seller in a commercially reasonable manner.

        4.17   Seller: Any Party which agrees to sell or provide to one or more
               of the other Parties any service pursuant to the Agreement under
               any Service Schedule and any applicable Confirmation Agreement.

        4.18   Service Schedule: A schedule of services established pursuant to
               Section 6 of this Agreement.

        4.19   Uncontrollable Forces: As defined in Section 10 of this Agreement
               or in a Confirmation Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   13
Western Systems Power Pool                               Original Sheet No. 10A
Rate Schedule FERC No. 6

        4.20   Unit Commitment Service: A capacity and associated scheduled
               energy transaction or a Physically-Settled Option which the
               Seller has agreed to sell and the Purchaser has agreed to buy
               from a specified unit(s) for a specified period, in

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   14
Western Systems Power Pool                               Original Sheet No. 11
Rate Schedule FERC No. 6

               accordance with the Agreement, including Service Schedule B, and
               any applicable Confirmation Agreement.

        4.20a  WSPP:  The Western Systems Power Pool.

        4.20b  WSPP Default Transmission Tariff: The transmission tariff filed
               on behalf of WSPP Members with FERC as it may be amended from
               time to time.

5.      TERM AND TERMINATION:

        5.1    This Agreement shall become effective as of July 27, 1991 when
               acceptance or approvals required under Section 13.2 of this
               Agreement with respect to those Parties that are subject to FERC
               jurisdiction have been obtained; provided, however, that this
               Agreement shall not become effective as to any Party in the event
               the pre-grant of termination requested under Section 13.3 is not
               allowed by FERC, absent that Party's consent; and provided,
               further, that this Agreement shall not become effective as to any
               Party if any terms, conditions or requirements imposed by FERC
               are found unacceptable by that Party. This Agreement shall
               continue in effect for a period of ten (10) years from said
               effective date and thereafter on a year to year basis until
               terminated by the Parties; provided, however, that any Party may
               withdraw its participation at any time after the effective date
               of this Agreement on thirty (30) days prior written notice to all
               other Parties.

        5.2    As of the effective date of any withdrawal, the withdrawing Party
               shall have no further rights or obligations under this Agreement
               except the right to collect

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   15
Western Systems Power Pool                               Original Sheet No. 12
Rate Schedule FERC No. 6

               money or receive service owed to it for transactions under any
               Service Schedule and the obligation to pay such amounts due to
               another Party and to complete any transactions agreed to under
               any Service Schedule as of said date. No Party shall oppose,
               before any court or regulatory agencies having jurisdiction, any
               other Party's withdrawal as provided in this Section.

        5.3    Except as provided for in Section 5.2, after termination, or
               withdrawal with respect to the withdrawing Party, all rights to
               services provided under this Agreement or any tariff or rate
               schedule which results from or incorporates this Agreement shall
               cease, and no Party shall claim or assert any continuing right to
               such services under this Agreement. Except as provided for in
               Section 5.2, no Party shall be required to provide services based
               in whole or in part on the existence of this Agreement or on the
               provision of services under this Agreement beyond the termination
               date, or date of withdrawal with respect to the withdrawing
               Party.

6.      SERVICE SCHEDULES AND WSPP DEFAULT TRANSMISSION TARIFF:

        6.1    The Parties contemplate that they may, from time to time, add or
               remove Service Schedules under this Agreement. The attached
               Service Schedules A through C for Economy Energy Service, Unit
               Commitment Service, and Firm System Capacity/Energy Sale or
               Exchange Service are hereby approved and made a part of this
               Agreement. Nothing contained herein shall be construed as
               affecting in any way the right of the Parties to jointly make
               application to FERC for a change

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   16
Western Systems Power Pool                               Original Sheet No. 13
Rate Schedule FERC No. 6

               in the rates and charges, classification, service, terms, or
               conditions affecting WSPP transactions under Section 205 of the
               Federal Power Act and pursuant to FERC rules and regulations
               promulgated thereunder. Subject to the provisions of Section 13,
               future Service Schedules, if any, shall be adopted only by
               amendment of this Agreement and shall be attached hereto and
               become a part of this Agreement.

        6.2    [RESERVED]

        6.3    When the WSPP Default Transmission Tariff applies as specified in
               the preamble to such Default Transmission Tariff, Transmission
               Service under it shall be available both to Parties and
               nonParties under this Agreement; provided, however, each Party or
               nonParty must be an eligible customer under the WSPP Default
               Transmission Tariff in order to receive service.

7.      HUB AND OPERATING AGENT:

        7.1    The Operating Agent shall act for itself and as agent for the
               Parties to carry out its designated responsibilities under this
               Agreement.

        7.2    The Operating Agent shall, as directed by the Operating Committee
               pursuant to Section 8.2.4, and on behalf of the Parties, either
               (i) purchase or lease, and install or have installed, operate and
               maintain the necessary equipment to operate the Hub or (ii)
               contract for Hub services.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   17
Western Systems Power Pool                               Original Sheet No. 14
Rate Schedule FERC No. 6

        7.3    The Operating Agent's estimated total costs to be incurred under
               Section 7.2 shall be subject to review by the Operating Committee
               and approval by the Executive Committee.

        7.4    At least sixty (60) days prior to each calendar year that this
               Agreement is in effect, the Operating Agent shall prepare a
               budget for said year of operation under this Agreement and shall
               submit same to the Operating Committee for review, and to the
               Executive Committee for approval. Subsequent budget revisions
               shall be submitted to the Operating Committee for review and to
               the Executive Committee for approval.

        7.5    The Operating Agent shall perform other administrative tasks
               necessary to implement this Agreement as directed by the
               Executive Committee.

        7.6    Except as provided in Section 7.7, all Parties shall share
               equally in all costs of the Operating Agent incurred under this
               Agreement, including but not limited to initial FERC filing fees
               and any reasonable legal fees.

        7.7    Each Party, in coordination with the Operating Agent, shall at
               its own expense acquire, install, operate, and maintain all
               necessary software and hardware on its system and the necessary
               communications link to the Hub to conduct transactions under this
               Agreement.

        7.8    The Operating Agent shall bill the Parties for costs incurred
               under this Agreement on an estimated basis reasonably in advance
               of when due, and such billings shall be paid by the Parties when
               due. Such billings shall be adjusted in the following

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   18
Western Systems Power Pool                               Original Sheet No. 15
Rate Schedule FERC No. 6

               month(s) to reflect recorded costs. Billing and payment of the
               Operating Agent's costs shall otherwise be implemented in
               accordance with the provisions of Section 9.

        7.9    The Operating Agent, at reasonable times and places, shall make
               available its records and documentation supporting costs for
               bills rendered under this Agreement for the inspection of any
               Party for a period of time not to exceed two (2) years from the
               time such bills were rendered.

               7.9.1  A Party requesting review of the Operating Agent's records
                      shall give the Operating Agent sufficient notice of its
                      intent, but in no event less than thirty (30) days.

               7.9.2  The requesting Party may perform this review using
                      personnel from its own staff or designate a certified
                      public accounting firm for the purpose of this review.

               7.9.3  All costs incurred to perform this review shall be at the
                      requesting Party's own expense.

               7.9.4  The Party performing the review shall not voluntarily
                      release the Operating Agent's records or disclose any
                      information contained therein to any third party unless
                      the written consent of the Operating Agent and the
                      Executive Committee has been obtained.

        7.10   Upon the termination of this Agreement, unless otherwise directed
               by the Executive Committee, the Operating Agent shall either
               dispose of any Hub

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   19
Western Systems Power Pool                               Original Sheet No. 16
Rate Schedule FERC No. 6

               equipment which it has purchased, or have the right of first
               refusal to purchase such equipment at original cost less
               depreciation, and shall apply any net proceeds from the sale of
               the Hub equipment against its costs incurred under this
               Agreement. The Operating Agent shall refund any excess proceeds
               equally to the Parties.

8.      ORGANIZATION AND ADMINISTRATION:

               As a means of securing effective and timely cooperation within
        the activities hereunder and as a means of dealing on a prompt and
        orderly basis with various problems which may arise in connection with
        system coordination and operation under changing conditions, the Parties
        hereby establish an Executive Committee and an Operating Committee.

        8.1    Executive Committee:

                      The Executive Committee shall consist of one
               representative and an alternate from each Party designated
               pursuant to Section 8.5 herein. The responsibilities of the
               Executive Committee are as follows:

               8.1.1  To establish sub-committees as it may from time to time
                      deem necessary.

               8.1.2  To review at least annually the service activities
                      hereunder to ensure that such activities are consistent
                      with the spirit and intent of this Agreement.

               8.1.3  To review any unresolved issues which may arise hereunder
                      and endeavor to resolve the issues.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   20
Western Systems Power Pool                               Original Sheet No. 17
Rate Schedule FERC No. 6

               8.1.4  To review and approve the Operating Agent's annual budget
                      under this Agreement, and any revision thereto, within
                      thirty (30) days of recommendation by the Operating
                      Committee.

               8.1.5  To establish and approve any additional budgets under this
                      Agreement as may be deemed necessary.

               8.1.6  To review and recommend to the Parties for approval any
                      additions or amendments to this Agreement, including
                      Service Schedules.

               8.1.7  To review and act on the application of an entity to
                      become a Party to this Agreement.

               8.1.8  To designate a successor to the Operating Agent, if
                      necessary.

               8.1.9  To do such other things and carry out such duties as
                      specifically required or authorized by this Agreement;
                      provided, however, that the Executive Committee shall have
                      no authority to amend this Agreement.

               8.1.10 To notify any Party of the rescission of its interest in
                      this Agreement due to its failure to continue to meet the
                      requirements of Section 16.1.

               8.1.11 To arrange for legal representation for filing this
                      Agreement (and any subsequent amendments) with FERC and
                      supporting the Agreement (or amendments) in any FERC
                      proceeding, and for other purposes as required.

        8.2    Operating Committee:

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   21
Western Systems Power Pool                               Original Sheet No. 18
Rate Schedule FERC No. 6

                      The Operating Committee shall consist of one
               representative and an alternate from each Party designated
               pursuant to Section 8.5. The responsibilities of the Operating
               Committee are as follows:

               8.2.1  To establish, review, approve, or modify procedures and
                      standard practices, consistent with the provisions hereof,
                      for the guidance of load dispatchers and other operating
                      employees in the Parties' electric systems as to matters
                      affecting transactions under this Agreement.

               8.2.2  To submit to the Executive Committee any proposed new or
                      revised Service Schedules.

               8.2.3  To establish, review, approve, or modify any scheduling or
                      operating procedures required in connection with
                      transactions under this Agreement.

               8.2.4  To direct the Operating Agent in matters governed by this
                      Agreement.

               8.2.5  To review and make recommendations to the Executive
                      Committee for approval of the Operating Agent's annual
                      budget under this Agreement, including any proposed
                      revisions thereto, within thirty (30) days of receipt from
                      the Operating Agent.

               8.2.6  To review and recommend as necessary the types and
                      arrangement of equipment for intersystem communication
                      facilities to enhance transactions and benefits under this
                      Agreement.

               8.2.7  To review the Operating Agent's estimated total costs of
                      providing, having provided or contracting for a Hub.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   22
Western Systems Power Pool                               Original Sheet No. 19
Rate Schedule FERC No. 6

               8.2.8  To review new member applications for membership to this
                      Agreement and make recommendations on said applications to
                      the Executive Committee.

               8.2.9  To do such other things and carry out such duties as
                      specifically required or authorized by this Agreement or
                      as directed by the Executive Committee; provided, however,
                      that the Operating Committee shall have no authority to
                      amend this Agreement.

        8.3    All matters which require Operating Committee or Executive
               Committee approval as provided in this Agreement shall be by no
               less than ninety percent (90%) affirmative agreement of the
               committee members present.

        8.4    Unless otherwise agreed by all committee members, the chairperson
               of each committee shall provide the other Parties at least ten
               (10) Business Days advance notification of all committee
               meetings, including an agenda of matters to be discussed and
               voted on at the meeting. All material issues to be submitted to a
               vote of the committee shall appear on the agenda. Prior to the
               selection of a chairperson the Operating Agent shall provide such
               advance notice for the initial meeting of each committee.

        8.5    Each Party shall give written notice to the other Parties of the
               name of its designated representative and alternate
               representative (to act in the absence of the designated
               representative) on each committee within thirty (30) days after
               the execution of this Agreement. Notice of any change of
               representative or alternate

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   23
Western Systems Power Pool                          First Revised Sheet No. 20
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 20

               representative shall be given by written notice to the other
               Parties. Each Party's designated representative shall be
               authorized to act on its behalf with respect to those committee
               responsibilities provided herein.

        8.6    Each committee shall meet as necessary or at the request of any
               Party.

        8.7    Each committee shall elect a chairperson and other officers at
               its first meeting.

9.      PAYMENTS:

        9.1    The accounting and billing period for transactions under Service
               Schedules to this Agreement shall be one (1) calendar month,
               unless otherwise specified in a Service Schedule agreed to
               through a Confirmation Agreement. Bills sent to any Party shall
               be sent to the appropriate billing address as set forth on the
               WSPP homepage or as otherwise specified by such Party.

        9.2    Payments for amounts billed under Service Schedules hereto shall
               be paid so that such payments are received by the Party to be
               paid on the 20th day of the invoicing month or the tenth (10) day
               after receipt of the bill, whichever is later. Notwithstanding
               the foregoing, Premiums shall be paid within three (3) Business
               Days of receipt of the invoice therefor. Payment shall be made at
               the location designated by the Party to which payment is due.
               Payment shall be considered received when payment is received by
               the Party to which Payment is due at the location designated by
               that Party. If the due date falls on a non-Business Day of either
               Party, then the payment shall be due on the next following
               Business Day.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001
<PAGE>   24
Western Systems Power Pool                               Original Sheet No. 20A
Rate Schedule FERC No. 6

        9.3    Amounts not paid on or before the due date shall be payable with
               interest accrued at the rate of one percent (1%) per month, or
               the maximum interest rate permitted

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001
<PAGE>   25
Western Systems Power Pool                          First Revised Sheet No. 21
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 21

               by law, if any, whichever is less, prorated by days from the due
               date to the date of payment unless and until the Executive
               Committee shall determine another rate.

        9.4    In case any portion of any bill is in dispute, the entire bill
               shall be paid when due. Any excess amount of bills which, through
               inadvertent errors or as a result of a dispute, may have been
               overpaid shall be returned by the owing Party upon determination
               of the correct amount, with interest accrued at the rate of one
               percent (1%) per month, or the maximum interest rate permitted by
               law, if any, whichever is less, prorated by days from the date of
               overpayment to the date of refund unless and until the Executive
               Committee shall determine another rate. The Parties shall have no
               rights to dispute the accuracy of any bill or payment after a
               period of two (2) years from the date on which the first bill was
               delivered for a specific transaction.

        9.5    If a Party's records reveal that a bill was not delivered for a
               specific transaction, then the Party may deliver to the
               appropriate Party a bill within two (2) years from the date on
               which the bill would have been delivered under Section 9.1 of
               this Agreement. The right to payment is waived with respect to
               transactions, or portions thereof, not billed within such two (2)
               year period.

        9.6    Each Party, or any third party representative of a Party, shall
               keep complete and accurate records, and shall maintain such data
               as may be necessary for the purpose of ascertaining the accuracy
               of all relevant data, estimates, or statements

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   26
Western Systems Power Pool                               Original Sheet No. 21A
Rate Schedule FERC No. 6

               of charges submitted hereunder for a period of two (2) years from
               the date the first bill was delivered for a specific transaction
               completed under this Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   27
Western Systems Power Pool                          First Revised Sheet No. 22
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 22

               Within a two (2) year period from the date the first bill was
               delivered under this Agreement, any Party to that transaction may
               request in writing copies of the records of the other Party for
               that transaction to the extent reasonably necessary to verify the
               accuracy of any statement or charge. The Party from which
               documents or data has been requested shall cooperate in providing
               the documents and data within a reasonable time period.

10.     UNCONTROLLABLE FORCES:

               No Party shall be considered to be in breach of this Agreement or
        any applicable Confirmation Agreement to the extent that a failure to
        perform its obligations under this Agreement or any such Confirmation
        Agreement shall be due to an Uncontrollable Force. The term
        "Uncontrollable Force" means an event or circumstance which prevents one
        Party from performing its obligations under one or more transactions,
        which event or circumstance is not within the reasonable control of, or
        the result of the negligence of the claiming Party, and which by the
        exercise of due diligence, the claiming Party is unable to avoid, cause
        to be avoided, or overcome. "Uncontrollable Forces" may include and are
        not restricted to flood, drought, earthquake, storm, fire, lightning,
        epidemic, war, riot, civil disturbance or disobedience, labor dispute,
        labor or material shortage, sabotage, restraint by court order or public
        authority, and action or nonaction by, or failure to obtain the
        necessary authorizations or approvals from, any governmental agency or
        authority

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   28
Western Systems Power Pool                               Original Sheet No. 22A
Rate Schedule FERC No. 6

        The following shall not be considered "Uncontrollable Forces": (i) the
        price of electricity faced by Seller; or (ii) Purchaser's inability due
        to price to use or resell the power purchased hereunder. No Party shall,
        however, be relieved of liability for failure of performance to the
        extent that such failure is due to causes arising out of its own
        negligence or due to removable or remediable causes which it fails to
        remove or remedy within a reasonable time period. Nothing contained
        herein shall be construed to require a

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   29
Western Systems Power Pool                          First Revised Sheet No. 23
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 23

        Party to settle any strike or labor dispute in which it may be involved.
        Any Party rendered unable to fulfill any of its obligations by reason of
        an Uncontrollable Force shall give prompt notice of such fact and shall
        exercise due diligence, as provided above, to remove such inability
        within a reasonable time period. If oral notice is provided, it shall be
        promptly followed by written notice.

               Notwithstanding the "due diligence" obligations or obligations to
        remove or remedy the causes set forth in the foregoing paragraph (which
        do not apply to this paragraph except as specified below), where the
        entity providing transmission services for transactions under any
        Service Schedule interrupts such transmission service, the interruption
        in transmission service shall be considered an Uncontrollable Force
        under this Section 10 only in the following two sets of circumstances:

        (1)    An interruption in transmission service shall be considered an
               Uncontrollable Force if (a) the Parties agreed on a transmission
               path for that transaction at the time the transaction under this
               Agreement was entered into by the Parties' thereto, (b) firm
               transmission involving that transmission path was obtained
               pursuant to a transmission tariff or contract to effectuate the
               transaction under the applicable Service Schedule, and (c) the
               entity providing transmission service curtailed or interrupted
               such firm transmission pursuant to the applicable transmission
               tariff or contract;

        (2)    if the Parties did not agree on the transmission path for a
               transaction at the time the transaction was entered into, an
               interruption in transmission service shall be

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   30
Western Systems Power Pool                               Original Sheet No. 24
Rate Schedule FERC No. 6

               considered an Uncontrollable Force only if (a) the Party
               contracting for transmission services shall have made
               arrangements with the entity providing transmission service for
               firm transmission to effectuate the transaction under the
               applicable Service Schedule, (b) the entity providing
               transmission service curtailed or interrupted such transmission
               service due to an event of Uncontrollable Forces or provision of
               like effect, and (c) the Party which contracted for such firm
               transmission services could not obtain alternate energy at the
               delivery point, alternate transmission services, or alternate
               means of delivering energy after exercising due diligence.

               No Party shall be relieved by operation of this Section 10 of any
        liability to pay for power delivered to the Purchaser or to make
        payments then due or which the Party is obligated to make with respect
        to performance which occurred prior to the Uncontrollable Force.

11.     WAIVERS:

               Any waiver at any time by any Party of its rights with respect to
        a default under this Agreement or any Confirmation Agreements, or any
        other matter under this Agreement, shall not be deemed a waiver with
        respect to any subsequent default of the same or any other matter.

12.     NOTICES:

        12.1   Except for the oral notice provided for in Section 10 of this
               Agreement, any formal notice, demand or request provided for in
               this Agreement shall be in

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   31
Western Systems Power Pool                               Original Sheet No. 25
Rate Schedule FERC No. 6

               writing and shall be deemed properly served, given or made if
               delivered in person, or sent by either registered or certified
               mail, postage prepaid, or prepaid telegram or fax or other means
               agreed to by the Parties.

        12.2   RESERVED

        12.3   Notices and requests of a routine nature applicable to delivery
               or receipt of power or energy or operation of facilities shall be
               given in such manner as the committees from time to time or the
               Parties to a transaction shall prescribe.

13.     APPROVALS:

        13.1   This Agreement is subject to valid laws, orders, rules and
               regulations of duly constituted authorities having jurisdiction.
               Nothing contained in this Agreement shall give FERC jurisdiction
               over those Parties not otherwise subject to such jurisdiction or
               be construed as a grant of jurisdiction over any Party by any
               state or federal agency not otherwise having jurisdiction by law.

        13.2   This Agreement, including any Service Schedule hereto, shall
               become effective as to any Party when it is accepted for filing
               by FERC, without changes or conditions unacceptable to such
               Party, for application to the Parties subject to FERC
               jurisdiction under the Federal Power Act; provided, however, that
               nothing in this Agreement is intended to restrict the authority
               of the Bonneville Power Administration (BPA) pursuant to
               applicable statutory authority to use its existing wholesale
               power and transmission rates or to adopt new rates, rate
               schedules, or general rate schedule provisions for application
               under this Agreement and obtain

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   32
Western Systems Power Pool                                 Original Sheet No. 26
Rate Schedule FERC No. 6

               interim or final approval of those rates from FERC pursuant to
               Section 7 of the Pacific Northwest Electric Power Planning and
               Conservation Act, 16 U.S.C. Sec. 839e, provided such rates do not
               exceed the maximum rates in the applicable Service Schedule and
               are consistent with the terms and conditions of said Service
               Schedule. If, upon filing of this Agreement by Parties subject to
               FERC jurisdiction under the Federal Power Act, FERC orders a
               hearing to determine whether this Agreement or a Service Schedule
               under this Agreement is just and reasonable under the Federal
               Power Act, the Agreement or Service Schedule shall not become
               effective until the date when an order issued by FERC,
               determining this Agreement or the Service Schedule to be just and
               reasonable without changes or new conditions unacceptable to the
               Parties, is no longer subject to judicial review. Any changes or
               conditions imposed by any agency or court, including FERC
               ordering a hearing, shall be cause for immediate withdrawal by
               any nonconsenting Party.

        13.3   The Parties subject to FERC jurisdiction under the Federal Power
               Act shall have the right to terminate their participation in this
               Agreement, and any rate schedule or services included herein,
               pursuant to the terms of Section 5 of this Agreement and without
               the necessity of further filing with or approval by FERC.

        13.4   Any amendment or change in maximum rates specified in the Service
               Schedules shall not become effective with regard to any Party
               that is subject to FERC jurisdiction under the Federal Power Act
               until it is accepted for filing or

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   33
Western Systems Power Pool                                 Original Sheet No. 27
Rate Schedule FERC No. 6

               confirmed and approved by FERC as specified in and subject to the
               conditions of Section 13.2.

        13.5   Nothing contained in this Agreement shall be construed to
               establish any precedent for any other agreement or to grant any
               rights to or impose any obligations on any Party beyond the scope
               and term of this Agreement.

14.     TRANSFER OF INTEREST IN AGREEMENT:

               No Party shall voluntarily transfer its membership under this
        Agreement without the written consent and approval of all other Parties
        except to a successor in operation of the applicable properties of such
        Party. With regard to the transfer of the rights and obligations of any
        Party associated with transactions under the Service Schedules, neither
        Party may assign such rights or obligations unless (a) the other Party
        provides its prior written consent which shall not be unreasonably
        withheld; or (b) the assignment is to a successor in operation whose
        creditworthiness is comparable to or higher than that of the assigning
        Party. Any successor or assignee of the rights of any Party, whether by
        voluntary transfer, judicial or foreclosure sale or otherwise, shall be
        subject to all the provisions and conditions of this Agreement and
        Confirmation Agreements (where applicable) to the same extent as though
        such successor or assignee were the original Party under this Agreement
        or the Confirmation Agreements, and no assignment or transfer of any
        rights under this Agreement or any Confirmation Agreement shall be
        effective unless and until the assignee or transferee agrees in writing
        to assume all of the obligations of the assignor or transferor and to be
        bound by all of the provisions and

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   34
Western Systems Power Pool                            First Revised Sheet No. 28
Rate Schedule FERC No. 6                       Superseding Original Sheet No. 28

        conditions of this Agreement and any Confirmation Agreement (where
        applicable). The execution of a mortgage or trust deed or a judicial or
        foreclosure sale made thereunder shall not be deemed a voluntary
        transfer within the meaning of this Section 14.

15.     SEVERABILITY:

               In the event that any of the terms, covenants or conditions of
        this Agreement or any Confirmation Agreement, or the application of any
        such term, covenant or condition, shall be held invalid as to any person
        or circumstance by any court, regulatory agency, or other regulatory
        body having jurisdiction, all other terms, covenants or conditions of
        this Agreement and the Confirmation Agreement and their application
        shall not be affected thereby, but shall remain in force and effect
        unless a court, regulatory agency, or other regulatory body holds that
        the provisions are not separable from all other provisions of this
        Agreement or such Confirmation Agreement.

16.     MEMBERSHIP:

        16.1   Any Electric Utility, Retail Entity or Qualifying Facility may
               become a Party to this Agreement. The Executive Committee shall
               notify such Electric Utility, Retail Entity or Qualifying
               Facility of its decision within sixty (60) days of a request to
               become a Party to this Agreement, and any acceptable entity shall
               become a Party hereto by the execution of this Agreement or a
               counterpart hereof, payment of costs pursuant to Section 16.4,
               and concluding any necessary acceptance or approval referred to
               in Section 13. Any such Party, if it is subject to the ratemaking
               jurisdiction of FERC,

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001
<PAGE>   35
Western Systems Power Pool                                 Original Sheet No. 29
Rate Schedule FERC No. 6

               shall be responsible for any FERC filing necessary for it to
               implement its performance under this Agreement.

        16.2   Each Party shall continue to meet the requirements of Section
               16.1 in order to remain a Party to this Agreement

        16.3   Being a Party to this Agreement shall not serve as a substitute
               for contractual arrangements that may be needed between any Party
               which operates a Control Area and any other Party which operates
               within that Control Area.

        16.4   Any entity that becomes a Party to this Agreement which was not a
               party to the experimental Western Systems Power Pool Agreement
               shall pay a one time fee of $25,000 under this Agreement in
               recognition of prior efforts and costs incurred by the parties to
               the experimental Western Systems Power Pool Agreement, which
               efforts greatly facilitated development of this Agreement. Such
               fee shall be credited to future costs of the Operating Agent
               incurred hereunder.

17.     RELATIONSHIP OF PARTIES:

        17.1   Nothing contained herein or in any Confirmation Agreement shall
               be construed to create an association, joint venture, trust, or
               partnership, or impose a trust or partnership covenant,
               obligation, or liability on or with regard to any one or more of
               the Parties. Each Party shall be individually responsible for its
               own covenants, obligations, and liabilities under this Agreement
               and under any applicable Confirmation Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   36
Western Systems Power Pool                            First Revised Sheet No. 30
Rate Schedule FERC No. 6                       Superseding Original Sheet No. 30

        17.2   All rights of the Parties are several, not joint. No Party shall
               be under the control of or shall be deemed to control another
               Party. Except as expressly provided in this Agreement, no Party
               shall have a right or power to bind another Party without its
               express written consent.

18.     NO DEDICATION OF FACILITIES:

               Any undertaking by one Party to another Party under any provision
        of this Agreement shall not constitute the dedication of the electric
        system or any portion thereof of the undertaking Party to the public or
        to the other Party, and it is understood and agreed that any such
        undertaking under any provision of this Agreement by a Party shall cease
        upon the termination of such Party's obligations under this Agreement.

19.     NO RETAIL SERVICES:

               Nothing contained in this Agreement shall grant any rights to or
        obligate any Party to provide any services hereunder directly to or for
        retail customers of any Party.

20.     THIRD PARTY BENEFICIARIES:

               This Agreement shall not be construed to create rights, in, or to
        grant remedies to, any third party as a beneficiary of this Agreement or
        of any duty, obligation or undertaking established herein except as
        provided for in Section 14.

21.     LIABILITY AND DAMAGES:

        21.1   This Agreement contains express remedies or measures of damages
               in Sections 21.3 and 22 for non-performance or default. THE
               LIABILITY OF THE NON-PERFORMING OR DEFAULTING PARTY SHALL BE
               LIMITED AS SET

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001
<PAGE>   37
Western Systems Power Pool                                Original Sheet No. 30A
Rate Schedule FERC No. 6

               FORTH IN SUCH PROVISIONS, AND ALL OTHER DAMAGES OR REMEDIES ARE
               HEREBY WAIVED. Therefore, except as provided in Sections 21.3 and
               22, no Party or its directors, members of its governing bodies,
               officers or employees shall be liable to any other Party or
               Parties for any loss or damage to property, loss of earnings

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   38
Western Systems Power Pool                                 Original Sheet No. 31
Rate Schedule FERC No. 6

               or revenues, personal injury, or any other direct, indirect, or
               consequential damages or injury, or punitive damages, which may
               occur or result from the performance or non-performance of this
               Agreement (including any applicable Confirmation Agreement),
               including any negligence arising hereunder. Any liability or
               damages faced by an officer or employee of a Federal agency or by
               that agency that would result from the operation of this
               provision shall not be inconsistent with Federal law.

        21.2   [RESERVED]

        21.3   The following damages provision shall apply to transactions under
               Service Schedules B and C. For transactions under Service
               Schedule A, this damages provision or some other damages
               provision will apply only if such a damages provision is agreed
               to through a Confirmation Agreement. The damages under this
               Section 21.3 apply to a Party's failure to deliver or receive
               electric power or energy in violation of the terms of the
               Agreement and any Confirmation Agreement. The Contract Quantity
               and Contract Price referred to in this Section 21.3 are part of
               the agreement between the Parties for which damages are being
               calculated under this Section.

               (a)    If either Party fails to deliver or receive, as the case
                      may be, the quantities of electric power or energy due
                      under the Agreement and any Confirmation Agreement
                      (thereby becoming a "Non-Performing Party" for the
                      purposes of this Section 21.3), the other party (the
                      "Performing

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   39
Western Systems Power Pool                                 Original Sheet No. 32
Rate Schedule FERC No. 6

                      Party") shall be entitled to receive from the
                      Non-Performing Party an amount calculated as follows
                      (unless performance is excused by Uncontrollable Forces as
                      provided in Section 10, the applicable Service Schedule,
                      or by the Performing Party):

                      (1)    If the amount the Purchaser scheduled or received
                             in any hour is less than the applicable hourly
                             Contract Quantity, then the Purchaser shall be
                             liable for (a) the product of the amount (whether
                             positive or negative), if any, by which the
                             Contract Price differed from the Sales Price
                             (Contract Price - Sales Price) and the amount by
                             which the quantity received by the Purchaser was
                             less than the hourly Contract Quantity; plus (b)
                             the amount of transmission charge(s), if any, for
                             firm transmission service upstream of the delivery
                             point, which the Seller incurred to achieve the
                             Sales Price, less the reduction, if any, in
                             transmission charge(s) achieved as a result of the
                             reduction in the Purchaser's schedule or receipt of
                             electric energy (based on Seller's reasonable
                             commercial efforts to achieve such reduction). If
                             the total amounts for all hours calculated under
                             this paragraph (1) are negative, then neither the
                             Purchaser nor the Seller shall pay any amount under
                             this Section 21.3(a)(1).

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   40
Western Systems Power Pool                                 Original Sheet No. 33
Rate Schedule FERC No. 6

                      (2)    If the amount the Seller scheduled or delivered in
                             any hour is less than the applicable hourly
                             Contract Quantity, then the Seller shall be liable
                             for (a) the product of the amount (whether positive
                             or negative), if any, by which the Replacement
                             Price differed from the Contract Price (Replacement
                             Price - Contract Price) and the amount by which the
                             quantity delivered by the Seller was less than the
                             hourly Contract Quantity; plus (b) the amount of
                             transmission charge(s), if any, for firm
                             transmission service downstream of the delivery
                             point, which the Purchaser incurred to achieve the
                             Replacement Price, less the reduction, if any, in
                             transmission charge(s) achieved as a result of the
                             reduction in the Seller's schedule or delivery
                             (based on Purchaser's reasonable commercial effort
                             to achieve such reduction). If the total amounts
                             for all hours calculated under this paragraph (2)
                             are negative, then neither the Purchaser nor the
                             Seller shall pay any amount under this Section
                             21.3(a)(2).

                      (3)    The Non-Performing Party shall pay any amount due
                             from it under this section within the billing
                             period as specified in Section 9 of this Agreement
                             or agreed to in the applicable Confirmation
                             Agreement if the Parties agreed to revise the
                             billing period in Section 9.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   41
Western Systems Power Pool                               Original Sheet No. 34
Rate Schedule FERC No. 6

               (b)    The Parties agree that the amounts recoverable under this
                      Section 21.3 are a reasonable estimate of loss and not a
                      penalty, and represent the sole and exclusive remedy for
                      the Performing Party. Such amounts are payable for the
                      loss of bargain and the loss of protection against future
                      risks.

               (c)    Each Party agrees that it has a duty to mitigate damages
                      in a commercially reasonable manner to minimize any
                      damages it may incur as a result of the other Party's
                      performance or non-performance of this Agreement.

               (d)    In the event the Non-Performing Party disputes the
                      calculation of the damages under this Section 21.3, the
                      Non-Performing Party shall pay the full amount of the
                      damages as required by Section 9 of this Agreement to the
                      Performing Party. After informal dispute resolution as
                      required by Section 34.1, any remaining dispute involving
                      the calculation of the damages shall be referred to
                      binding dispute resolution as provided by Section 34.2 of
                      this Agreement. If resolution or agreement results in
                      refunds or the need for refunds to the Non-Performing
                      Party, such refunds shall be calculated in accordance with
                      Section 9.4 of this Agreement.

22.     DEFAULT OF TRANSACTIONS UNDER THIS AGREEMENT AND CONFIRMATION
        AGREEMENTS:

        22.1   EVENTS OF DEFAULT

               An "Event of Default" shall mean with respect to a Party
("Defaulting Party"):

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   42

Western Systems Power Pool                          First Revised Sheet No. 35
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 35

               (a)    the failure by the Defaulting Party to make, when due, any
                      payment required pursuant to this Agreement or
                      Confirmation Agreement if such failure is not remedied
                      within two (2) Business Days after written notice of such
                      failure is given to the Defaulting Party by the other
                      Party ("the Non-Defaulting Party"). The Non-Defaulting
                      Party shall provide the notice by facsimile to the
                      designated contact person for the Defaulting Party and
                      also shall send the notice by overnight delivery to such
                      contact person; or

               (b)    the failure by the Defaulting Party to provide clear and
                      good title as required by Section 33.3, or to have made
                      accurate representations and warranties as required by
                      Section 37 and such failure is not cured within five (5)
                      Business Days after written notice thereof to the
                      Defaulting Party; or

               (c)    The institution, with respect to the Defaulting Party, by
                      the Defaulting Party or by another person or entity of a
                      bankruptcy, reorganization, moratorium, liquidation or
                      similar insolvency proceeding or other relief under any
                      bankruptcy or insolvency law affecting creditor's rights
                      or a petition is presented or instituted for its
                      winding-up or liquidation; or

               (d)    The failure by the Defaulting Party to provide adequate
                      assurances of its ability to perform all of its
                      outstanding material obligations to the Non-Defaulting
                      Party under the Agreement or Confirmation Agreement

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   43

Western Systems Power Pool                          First Revised Sheet No. 36
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 36

                      pursuant to Section 27 of this Agreement or any substitute
                      or modified provision in the Confirmation Agreement.

               (e)    With respect to its Guarantor, if any:

                      (i)    if a material representation or warranty made by a
                             Guarantor in connection with this Agreement, or any
                             transaction entered into hereunder, is false or
                             misleading in any material respect when made or
                             when deemed made or repeated; or

                      (ii)   the failure of a Guarantor to make any payment
                             required or to perform any other material covenant
                             or obligation in any guarantee made in connection
                             with this Agreement, including any transaction
                             entered into hereunder, and such failure shall not
                             be remedied within three (3) Business Days after
                             written notice; or

                      (iii)  a Guarantor becomes Bankrupt;

                      (iv)   the failure, without written consent of the other
                             Party, of a Guarantor's guarantee to be in full
                             force and effect for purposes of this Agreement
                             (other than in accordance with its terms) prior to
                             the satisfaction of all obligations of such Party
                             under each transaction to which such guarantee
                             shall relate; or

                      (v)    a Guarantor shall repudiate, disaffirm, disclaim,
                             or reject, in whole or in part, or challenge the
                             validity of, any guarantee.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   44
Western Systems Power Pool                               Original Sheet No. 36A
Rate Schedule FERC No. 6

        22.2   REMEDIES FOR EVENTS OF DEFAULT

                      If an Event of Default occurs, the Non-Defaulting Party
               shall possess the right to terminate all transactions between the
               Parties under this Agreement upon written notice (by facsimile or
               other reasonable means) to the Defaulting Party, such notice of
               termination to be effective immediately upon receipt. If the
               Non-Defaulting Party fails to exercise this right of termination
               within thirty (30) days following the time when the Event of
               Default becomes known (or more than thirty days if the
               Non-Defaulting and Defaulting Parties agree to an extension),
               then such right of termination shall no longer be available to
               the Non-Defaulting Party as a remedy for the Event(s) of Default.
               The Non-Defaulting Party terminating transaction(s) under this
               Section 22.2 may do so without making a filing at FERC.

                      Upon termination, the Non-Defaulting Party shall liquidate
               all transactions as soon as practicable, provided that in no
               event will the Non-Defaulting Party be allowed to liquidate
               Service Schedule A transactions. The payment associated with
               termination ("Termination Payment") shall be calculated in
               accordance with this Section 22.2 and Section 22.3. The
               Termination Payment shall be the sole and exclusive remedy for
               the Non-Defaulting Party for each terminated transaction
               ("Terminated Transaction") for the time period beginning at the
               time notice of termination under this Section 22 is received.
               Prior to receipt

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   45
Western Systems Power Pool                               Original Sheet No. 37
Rate Schedule FERC No. 6

               of such notice of termination by the Defaulting Party, the
               Non-Defaulting Party may exercise any remedies available to it
               under Section 21.3 of this Agreement or Confirmation
               Agreement(s), and any other remedies available to it at law or
               otherwise.

                      Upon termination, the Non-Defaulting Party may withhold
               any payments it owes the Defaulting Party for any obligations
               incurred prior to termination under this Agreement or
               Confirmation Agreement(s) until the Defaulting Party pays the
               Termination Payment to the Non-Defaulting Party. The
               Non-Defaulting Party shall possess the right to set-off the
               amount due it under this Section 22 by any such payments due the
               Defaulting Party as provided in Section 22.3(d).

        22.3   LIQUIDATION CALCULATION OPTIONS

                      The Non-Defaulting Party shall calculate the Termination
               Payment as follows:

               (a)    The Gains and Losses shall be determined by comparing the
                      value of the remaining term, transaction quantities, and
                      transaction prices under each Terminated Transaction had
                      it not been terminated to the equivalent quantities and
                      relevant market prices for the remaining term either
                      quoted by a bona fide third-party offer or which are
                      reasonably expected to be available in the market under a
                      replacement contract for each Terminated Transaction. To
                      ascertain the market prices of a replacement contract, the
                      Non-Defaulting Party may consider, among other valuations,
                      quotations

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   46
Western Systems Power Pool                               Original Sheet No. 38
Rate Schedule FERC No. 6

                      from leading dealers in energy contracts, any or all of
                      the settlement prices of the NYMEX power futures contracts
                      (or NYMEX power options contracts in the case of
                      Physically-Settled Options) and other bona fide third
                      party offers, all adjusted for the length of the remaining
                      term and differences in transmission. It is expressly
                      agreed that the Non-Defaulting Party shall not be required
                      to enter into replacement transactions in order to
                      determine the Termination Payment.

               (b)    The Gains and Losses calculated under paragraph (a) shall
                      be discounted to present value using the Present Value
                      Rate as of the time of termination (to take account to the
                      period between the time notice of termination was
                      effective and when such amount would have otherwise been
                      due pursuant to the relevant transaction). The "Present
                      Value Rate" shall mean the sum of 0.50% plus the yield
                      reported on page "USD" of the Bloomberg Financial Markets
                      Services Screen (or, if not available, any other
                      nationally recognized trading screen reporting on-line
                      intraday trading in United States government securities)
                      at 11:00 a.m. (New York City, New York time) for the
                      United States government securities having a maturity that
                      matches the average remaining term of the Terminated
                      Transactions; and

               (c)    The Non-Defaulting Party shall set off or aggregate, as
                      appropriate, the Gains and Losses (as calculated in
                      Section 22.3(a)) and Costs and notify

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   47
Western Systems Power Pool                               Original Sheet No. 39
Rate Schedule FERC No. 6

                      the Defaulting Party. If the Non-Defaulting Party's
                      aggregate Losses and Costs exceed its aggregate Gains, the
                      Defaulting Party shall, within three (3) Business Days of
                      receipt of such notice, pay the Termination Payment to the
                      Non-Defaulting Party, which amount shall bear interest at
                      the Present Value rate from the time notice of termination
                      was received until paid. If the Non-Defaulting Party's
                      aggregate Gains exceed its aggregate Losses and Costs, the
                      Non-Defaulting Party, after any set-off as provided in
                      paragraph (d), shall pay the remaining amount to the
                      Defaulting Party within three (3) Business Days of the
                      date notice of termination was received including interest
                      at the Present Value from the time notice of termination
                      was received until the Defaulting Party receives payment.

               (d)    The Non-Defaulting Party shall aggregate or set off, as
                      appropriate, at its election, any or all other amounts
                      owing between the Parties (discounted at the Present Value
                      Rate) under this Agreement and any Confirmation Agreements
                      against the Termination Payment so that all such amounts
                      are aggregated and/or netted to a single liquidated
                      amount. The net amount due from any such liquidation shall
                      be paid within three (3) Business Days following the date
                      notice of termination is received.

                      If the Defaulting Party disagrees with the calculation of
               the Termination Payment and the Parties cannot otherwise resolve
               their differences, the calculation issue shall be submitted to
               informal dispute resolution as provided in Section 34.1

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   48
Western Systems Power Pool                               Original Sheet No. 40
Rate Schedule FERC No. 6

               of this Agreement and thereafter binding dispute resolution
               pursuant to Section 34.2 if the informal dispute resolution does
               not succeed in resolving the dispute. Pending resolution of the
               dispute, the Defaulting Party shall pay the full amount of the
               Termination Payment calculated by the Non-Defaulting Party within
               three (3) Business Days of receipt of notice as set forth in
               Section 33.2(c) subject to the Non-Defaulting Party refunding,
               with interest, pursuant to Section 9.4, any amounts determined to
               have been overpaid.

                      For purposes of this Section 22.3:

               (i)    "Gains" means the economic benefit (exclusive of Costs),
                      if any, resulting from the termination of the Terminated
                      Transactions, determined in a commercially reasonable
                      manner as calculated in accordance with this Section 22.3;

               (ii)   "Losses" means the economic loss (exclusive of Costs), if
                      any, resulting from the termination of the Terminated
                      Transactions, determined in a commercially reasonable
                      manner as calculated in accordance with this Section 22.3;

               (iii)  "Costs" means brokerage fees, commissions and other
                      similar transaction costs and expenses reasonably incurred
                      in terminating any specifically related arrangements which
                      replace a Terminated Transaction, transmission and
                      ancillary service costs associated with Terminated
                      Transactions, and reasonable attorneys' fees, if any,
                      incurred in connection

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   49
Western Systems Power Pool                               Original Sheet No. 41
Rate Schedule FERC No. 6

                      with the Non-Defaulting Party enforcing its rights with
                      regard to the Terminated Transactions. The Non-Defaulting
                      Party shall use reasonable efforts to mitigate or
                      eliminate these Costs.

               (iv)   In no event, however, shall a Party's Gains, Losses or
                      Costs include any penalties or similar charges imposed by
                      the Non-Defaulting Party.

        22A.   DEFAULT IN PAYMENT OF WSPP OPERATING COSTS:

               22A.1  A Party shall be deemed to be in default in payment of its
                      share of WSPP operating costs pursuant to Section 7 of
                      this Agreement, if any, when payment is not received
                      within ten (10) days after receipt of written notice. A
                      default by any Party in such payment obligations shall be
                      cured by payment of all overdue amounts together with
                      interest accrued at the rate of one percent (1%) per
                      month, or the maximum interest rate permitted by law, if
                      any, whichever is less, prorated by days from the due date
                      to the date the payment curing the default is made unless
                      and until the Executive Committee shall determine another
                      rate.

               22A.2  A defaulting Party, which is in default under Section
                      22.A1, shall be liable for all costs, including costs of
                      collection and reasonable attorney fees, plus interest as
                      provided in Section 22.A1 hereof.

               22A.3  The rights under this Agreement of a Party which is in
                      default of its obligation to pay operating costs under
                      this Agreement for a period of three (3) months or more
                      may be revoked by a vote of the non-defaulting

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   50
Western Systems Power Pool                               Original Sheet No. 42
Rate Schedule FERC No. 6

                      Parties' representatives on the Executive Committee
                      consistent with Section 8.3. The defaulting Party's rights
                      shall not be revoked, however, unless said Party has
                      received at least thirty (30) days written notice of the
                      non-defaulting Parties' intent to revoke such rights. Said
                      notice shall state the date on which the revocation of
                      rights shall become effective if the default is not cured
                      and shall state all actions which must be taken or amounts
                      which must be paid to cure the default. This provision
                      allowing the non-defaulting Parties to revoke such rights
                      is in addition to any other remedies provided in this
                      Agreement or at law and shall in no way limit the
                      non-defaulting Parties' ability to seek judicial
                      enforcement of the defaulting Party's obligations to pay
                      its share of the operating costs under this Agreement.
                      Upon the effective date of such revocation of rights, the
                      defaulting party shall not be allowed to enter into any
                      new transactions under this Agreement. The defaulting
                      party under the Agreement or any Confirmation Agreements
                      shall be required to carry out all obligations that
                      existed prior to the effective date of such revocation. If
                      a defaulting Party's rights under this Agreement have been
                      revoked, the Executive Committee may restore that Party's
                      rights upon the defaulting Party paying all amounts due
                      and owing under this Agreement.

               22A.4  Upon revocation of the rights of a defaulting Party under
                      this Agreement, Operating Agent costs hereunder shall be
                      equally shared among the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   51
Western Systems Power Pool                               Original Sheet No. 43
Rate Schedule FERC No. 6

                      remaining Parties. Cost allocation adjustments shall be
                      retroactive to the date of the default.

23.     OTHER AGREEMENTS:

               No provision of this Agreement shall preclude any Party from
        entering into other agreements or conducting transactions under existing
        agreements with other Parties or third parties. This Agreement shall not
        be deemed to modify or change any rights or obligations under any prior
        contracts or agreements between or among any of the Parties.

24.     GOVERNING LAW:

               This Agreement and any Confirmation Agreement shall be governed
        by and construed in accordance with the laws of the State of Utah,
        without regard to the conflicts of laws rules thereof. The foregoing
        notwithstanding, (1) if both the Seller and Purchaser are organized
        under the laws of Canada, then the laws of the province of the Seller
        shall govern, or (2) if the Seller is an agency of or part of the United
        States Government, then the laws of the United States of America shall
        govern.

25.     JUDGMENTS AND DETERMINATIONS:

               Whenever it is provided in this Agreement that a Party shall be
        the sole judge of whether, to what extent, or under what conditions it
        will provide a given service, its exercise of its judgment shall be
        final and not subject to challenge. Whenever it is provided that (i) a
        service under a given transaction may be curtailed under certain
        conditions or circumstances, the existence of which are determined by or
        in the judgment of a Party, or (ii) the existence of qualifications for
        membership shall be determined by

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   52
Western Systems Power Pool                               Original Sheet No. 44
Rate Schedule FERC No. 6

        the Executive Committee pursuant to Section 16, that Party's or the
        Executive Committee's determination or exercise of judgment shall be
        final and not subject to challenge if it is made in good faith and not
        made arbitrarily or capriciously.

26.     COMPLETE AGREEMENT:

               This Agreement and any subsequent amendments, including the
        Service Schedules and Exhibits incorporated herein, and any Confirmation
        Agreement, shall constitute the full and complete agreement of the
        Parties with respect to the subject matter hereof, and all prior or
        contemporaneous representations, statements, negotiations,
        understandings and inducements are fully merged and incorporated in this
        Agreement.

27.     CREDITWORTHINESS:

               Should a Party's creditworthiness, financial responsibility, or
        performance viability become unsatisfactory to the other Party in such
        other Party's reasonably exercised discretion with regard to any
        transaction pursuant to this Agreement and any Confirmation Agreement
        (after the transaction is agreed to or begins), the dissatisfied Party
        (the "First Party") may require the other Party (the "Second Party") to
        provide, at the Second Party's option (but subject to the First Party's
        acceptance based upon reasonably exercised discretion), either (1) the
        posting of a Letter of Credit, (2) a cash prepayment, (3) the posting of
        other acceptable collateral or security by the Second Party, (4) a
        Guarantee Agreement executed by a creditworthy entity; or (5) some other
        mutually agreeable method of satisfying the First Party. The Second
        Party's obligations under this Section 27 shall be limited to a
        reasonable estimate of the damages to the First Party

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   53
Western Systems Power Pool                               Original Sheet No. 45
Rate Schedule FERC No. 6

        (consistent with Section 21.3 of this Agreement) if the Second Party
        were to fail to perform its obligations. Events which may trigger the
        First Party questioning the Second Party's creditworthiness, financial
        responsibility, or performance viability include, but are not limited
        to, the following:

        (1)    The First Party has knowledge that the Second Party (or its
               Guarantor if applicable) are failing to perform or defaulting
               under other contracts.

        (2)    The Second Party has exceeded any credit or trading limit set out
               in the Confirmation Agreement or other agreement between the
               Parties.

        (3)    The Second Party or its Guarantor has debt which is rated as
               investment grade and that debt falls below the investment grade
               rating by at least one rating agency or is below investment grade
               and the rating of that debt is downgraded further by at least one
               rating agency.

        (4)    Other material adverse changes in the Second Party's financial
               condition occur.

        (5)    Substantial changes in market prices which materially and
               adversely impact the Second Party's ability to perform under this
               Agreement or any Confirmation Agreement occur.

               If the Second Party fails to provide such reasonably satisfactory
        assurances of its ability to perform a transaction hereunder within
        three (3) Business Days of demand therefore, that will be considered an
        Event of Default under Section 22 of this Agreement and the First Party
        shall have the right to exercise any of the remedies provided for under

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   54
Western Systems Power Pool                               Original Sheet No. 46
Rate Schedule FERC No. 6

        that Section 22. Nothing contained in this Section 27 shall affect any
        credit agreement or arrangement, if any, between the Parties.

28.     NETTING AND SET-OFF:

        28.1   If the Purchaser and the Seller are each required to pay an
               amount to each other in the same calendar month for transactions
               under this Agreement, then such amounts with respect to each
               Party may be aggregated and the Parties may discharge their
               obligations to pay through netting of the respective amounts due,
               in which case the Party, if any, owing the greater aggregate
               amount may pay to the other Party the difference between the
               amounts owed. Each Party reserves to itself all rights, set-offs,
               counterclaims, and other remedies and defenses (to the extent not
               expressly herein waived or denied) which such Party has or may be
               entitled to arising from or out of this Agreement and any
               applicable Confirmation Agreements. All outstanding transactions
               and the obligations to make payments under this Agreement, any
               Confirmation Agreement, or any other agreement between the
               Parties may be offset against each other, set off, or recouped
               therefrom.

        28.2   Parties shall net payments (associated with transactions under
               this Agreement and Confirmation Agreement) in accordance with
               Exhibit A, if such Parties have executed the form attached as
               Exhibit A. The Parties obligation to net shall include the
               netting of all payments received by the Parties in the same
               calendar month. Parties that have executed Exhibit A shall
               provide a signed copy of

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   55
Western Systems Power Pool                               Original Sheet No. 47
Rate Schedule FERC No. 6

               Exhibit A to the Parties under this Agreement and indicate on the
               WSPP Homepage that they have so executed Exhibit A (once the WSPP
               Homepage possesses the necessary capability). If a Party executed
               Exhibit A, that Party may withdraw its agreement to net by
               providing thirty (30) days notice to all Parties that it is
               withdrawing its agreement to net. If a Party indicated its
               election to net payments on the WSPP Homepage and that Party
               desires to withdraw its agreement to net, that Party shall
               provide 30 days notice on the WSPP Homepage of the change in its
               election to net and such action shall be sufficient to satisfy
               the notice requirement of the preceding sentence. Any such
               changes in netting status shall apply beginning 30 days after
               notice is provided and only shall apply to transactions agreed to
               beginning on or after the date the change in netting status
               becomes effective.

        28.3   The Parties may by separate agreement either through a
               Confirmation Agreement or some other agreement set out specific
               terms relating to the implementation of the netting and/or
               set-off in addition to or in lieu of Exhibit A.

29.     TAXES:

               The Contract Price for all transactions under the Service
        Schedules shall include full reimbursement for, and the Seller is liable
        for and shall pay, or cause to be paid, or reimburse the Purchaser for
        if the Purchaser has paid, all taxes applicable to a transaction that
        arise prior to the delivery point. If the Purchaser is required to remit
        such tax, the amount shall be deducted from any sums due to the Seller.
        The Seller shall indemnify,

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   56
Western Systems Power Pool                               Original Sheet No. 48
Rate Schedule FERC No. 6

        defend, and hold harmless the Purchaser from any claims for such taxes.
        The Contract Price does not include reimbursement for, and the Purchaser
        is liable for and shall pay, cause to be paid, or reimburse the Seller
        for if the Seller has paid, all taxes applicable to a transaction
        arising at and from the delivery point, including any taxes imposed or
        collected by a taxing authority with jurisdiction over the Purchaser.
        The Purchaser shall indemnify, defend, and hold harmless the Seller from
        any claims for such taxes. Either Party, upon written request of the
        other Party, shall provide a certificate of exemption or other
        reasonably satisfactory evidence of exemption if either Party is exempt
        from taxes, and shall use reasonable efforts to obtain and cooperate
        with the other Party in obtaining any exemption from or reduction of any
        tax. Taxes are any amounts imposed by a taxing authority associated with
        the transaction.

30.     CONFIDENTIALITY:

               The terms of any transaction under the Service Schedules or any
        other information exchanged by the Purchaser and Seller relating to the
        transaction shall not be disclosed to any person not employed or
        retained by the Purchaser or the Seller or their affiliates, except to
        the extent disclosure is (1) required by law, (2) reasonably deemed by
        the disclosing Party to be required to be disclosed in connection with a
        dispute between or among the Parties, or the defense of any litigation
        or dispute, (3) otherwise permitted by consent of the other Party, which
        consent shall not be unreasonably withheld, (4) required to be made in
        connection with regulatory proceedings (including proceedings relating
        to FERC, the United States Securities and Exchange Commission or any
        other

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   57
Western Systems Power Pool                               Original Sheet No. 49
Rate Schedule FERC No. 6

        federal, state or provincial regulatory agency); (5) required to comply
        with North American Electric Reliability Organization, regional
        reliability council, or successor organization requirements; or (6)
        necessary to obtain transmission service. In the event disclosure is
        made pursuant to this provision, the Parties shall use reasonable
        efforts to minimize the scope of any disclosure and have the recipients
        maintain the confidentiality of any documents or confidential
        information covered by this provision, including, if appropriate,
        seeking a protective order or similar mechanism in connection with any
        disclosure. This provision shall not apply to any information that was
        or is hereafter in the public domain (except as a result of a breach of
        this provision).

31.     TRANSMISSION TARIFF:

               Pursuant to FERC Order No. 888, issued on April 24, 1996, and
        FERC orders where applicable, the WSPP Default Transmission Tariff has
        been filed and has become effective. The Parties agree to be bound by
        the terms of that Tariff for so long as they are Western Systems Power
        Pool members.

32.     TRANSACTION SPECIFIC TERMS AND ORAL AGREEMENTS:

        32.1   The Parties' agreement to transaction specific terms which
               constitute the Confirmation Agreement shall be made by one of the
               following methods: (1) provision of pertinent information through
               written Confirmation Agreements (see Exhibit C for a sample); or
               (2) oral conversation, provided that such oral conversation is
               recorded electronically. By mutual agreement and consistent with
               and pursuant to the provisions of this Section 32, the Parties to
               a transaction under

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   58

Western Systems Power Pool                          First Revised Sheet No. 50
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 50

               this Agreement may agree to modify any term of this Agreement
               which applies to such transaction (but now to provisions
               regarding the operation of the WSPP as an organization including
               Sections 7 and 8), such agreement to be reflected in a
               Confirmation Agreement. Written confirmation shall be required
               for all transactions of one week or more. Upon request of the
               Purchaser or at the election of the Seller, the Seller shall
               provide written confirmation which must be received by the
               Purchaser within five Business Days of the date of the agreement
               or request. The Purchaser shall have five Business Days from date
               of receipt to respond to the confirmation. If the Purchaser does
               not respond within that time period, the Seller's written
               confirmation shall be considered as accepted and final. If the
               Seller fails to provide any required written confirmation within
               five Business Days, as described above, then the Purchaser may
               submit a written confirmation to the Seller. The Purchaser shall
               submit such written confirmation within five Business Days after
               the deadline for submitting a written confirmation applicable to
               the Seller as set forth above has expired. If the Seller fails to
               respond to Purchaser's confirmation within five Business Days,
               then the Purchaser's written confirmation shall be considered as
               accepted and final. Notwithstanding the foregoing, any failure of
               the Seller or the Purchaser to provide written confirmation of
               the transaction shall not invalidate any oral agreement of the
               Parties. Nor shall any oral agreement of the Parties be
               considered invalidated before and during the time period the
               confirmation process

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   59
Western Systems Power Pool                               Original Sheet No. 50A
Rate Schedule FERC No. 6

               is ongoing and no final Confirmation Agreement under these
               procedures or through mutual agreement has been reached.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2001
           Western Systems Power Pool
Issued on: May 2, 2001

<PAGE>   60
Western Systems Power Pool                               Original Sheet No. 51
Rate Schedule FERC No. 6

        32.2   The Parties agree not to contest, or assert any defense with
               respect to, the validity or enforceability of any agreement to
               the terms concerning a specific transaction(s), on the basis that
               documentation of such terms fails to comply with the requirements
               of any statute that agreements be written or signed. Each Party
               consents to the recording by the other Party, without any further
               notice, of telephone conversations between representatives of the
               Parties, which contain agreements to or discussion concerning the
               terms of a specific transaction(s). All such recordings may be
               introduced and admitted into evidence for the purpose of proving
               agreements to terms, and any objection to such introduction or
               admission for such purpose is hereby expressly waived. The terms
               documented hereunder, whether stated in a written document or a
               recording, are intended by the Parties as a final expression of
               their agreement with respect to such terms as are included
               therein and may not be contradicted by evidence of any prior
               agreement, but may be supplemented by course of dealing,
               performance, usage of trade and evidence of consistent additional
               mutually agreed-upon terms.

        32.3   For individual transactions under the Service Schedules, the
               Agreement as it may be modified or supplemented by a Confirmation
               Agreement shall bind the Parties and govern the transactions;
               provided, however, if the Parties to a transaction do not reach
               agreement on such modification or change to a term of the
               Agreement, or the Confirmation Agreement is not considered
               accepted and final pursuant to Section 32.1, then the term or
               terms of the Agreement, which the Parties could not

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   61
Western Systems Power Pool                               Original Sheet No. 52
Rate Schedule FERC No. 6

               reach agreement to modify or change or which are not considered
               modified pursuant to Section 32.1, shall apply to that
               transaction. In the event of a conflict between a binding and
               effective Confirmation Agreement and this Agreement, the
               Confirmation Agreement shall govern.

        32.4   The Seller shall not be required to file written confirmations
               with FERC except as provided in the Service Schedules.

33.     PERFORMANCE, TITLE, AND WARRANTIES FOR TRANSACTIONS UNDER SERVICE
        SCHEDULES:

        33.1   Performance

               33.1.1 The Seller shall deliver to the delivery point(s) as
                      agreed to in the applicable Confirmation Agreement and
                      sell to the Purchaser in accordance with the terms of the
                      Agreement and such Confirmation Agreement.

               33.1.2 The Purchaser shall receive and purchase the Contract
                      Quantity, as agreed to by the Parties in the applicable
                      Confirmation Agreement, at the delivery point(s) and
                      purchase from the Seller in accordance with the terms of
                      the Agreement and such Confirmation Agreement.

        33.2   Title and Risk of Loss

                      Title to and risk of loss of the electric energy shall
               pass from the Seller to the Purchaser at the delivery point
               agreed to in the Confirmation Agreement; provided, however, with
               regard to federal agencies or parts of the United States

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   62
Western Systems Power Pool                                 Original Sheet No. 53
Rate Schedule FERC No. 6

               Government, title to and risk of loss shall pass to Purchaser to
               the extent permitted by and consistent with applicable law.

        33.3   Warranties

                      The Seller warrants that it will transfer to the Purchaser
               good title to the electric energy sold under the Agreement and
               any Confirmation Agreement, free and clear of all liens, claims,
               and encumbrances arising or attaching prior to the delivery point
               and that Seller's sale is in compliance with all applicable laws
               and regulations. THE SELLER HEREBY DISCLAIMS ALL OTHER
               WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF
               MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

34.     DISPUTE RESOLUTION:

        34.1   INFORMAL DISPUTE RESOLUTION

                      Before binding dispute resolution or any other form of
               litigation may proceed, any dispute between the Parties to a
               transaction under this Agreement first shall be referred to
               nonbinding mediation. The Parties shall attempt to agree upon a
               mediator from a list of ten (10) candidates provided by the
               Chairman of the WSPP Operating Committee or his or her designee.
               If the Parties are unable to agree, then the Chairman or the
               designee shall appoint a mediator for the dispute. Neither the
               mediator nor the person involved on behalf of the WSPP in
               developing a list of mediators for the Parties to choose from or
               in selecting the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   63
Western Systems Power Pool                                 Original Sheet No. 54
Rate Schedule FERC No. 6

               mediator (if the Parties are unable to do so) shall possess a
               direct or indirect interest in either Party or the subject matter
               of the mediation. The WSPP shall establish procedures for the
               appointment of mediators and the conduct of mediation and those
               procedures shall apply to the mediation.

        34.2   BINDING DISPUTE RESOLUTION

                      The Parties to a dispute may elect binding dispute
               resolution using the following process unless binding arbitration
               of certain disputes is required under this Agreement in which
               event the Parties shall use the process set forth in this Section
               34.2 to resolve such disputes, unless the Parties otherwise
               agree:

               (a)    WSPP Dispute Resolution: A Party to a dispute (if binding
                      dispute resolution is required) or all Parties to a
                      dispute (if agreement of the Parties is required for
                      binding dispute resolution) may initiate binding dispute
                      resolution under WSPP procedures by notifying the Chairman
                      of the WSPP Operating Committee or his or her designee.
                      The Chairman or his or her designee shall provide the
                      Parties with a list of ten (10) eligible arbitrators.
                      Within ten (10) days of receiving the list, the Parties
                      shall agree on a single arbitrator from the list to
                      conduct the arbitration, or notify the Chairman of the
                      Operating Committee or the designee of their inability to
                      reach agreement. If notified of the Parties inability to
                      reach agreement, then the Chairman or the designee shall
                      choose the arbitrator from the list within five (5) days.
                      Neither the arbitrator nor the person

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   64
Western Systems Power Pool                                 Original Sheet No. 55
Rate Schedule FERC No. 6

                      involved on behalf of the WSPP in developing a list of
                      arbitrators for the Parties to choose from or in selecting
                      the arbitrator (if the Parties are unable to do so) shall
                      possess a direct or indirect interest in either Party or
                      the subject matter of the arbitration. The Procedures to
                      be used for this arbitration shall follow the arbitration
                      procedures which shall be developed and maintained by the
                      WSPP and the procedures will be generally consistent with
                      the commercial arbitration rules of the American
                      Arbitration Association though not involving the
                      Association.

                      If the Parties agree to binding dispute resolution under
               this Section 34.2, each Party understands that it will not be
               able to bring a lawsuit concerning any dispute that may arise
               which is covered by this arbitration provision. Notwithstanding
               the foregoing, nothing herein is intended to waive any provision
               of the Federal Arbitration Act, 9 U.S.C. Section 1, et. seq., or
               any right under state statute or common law to challenge an
               arbitration award or to prevent any action to enforce any
               arbitration award.

                      A Party's liability and damages under any arbitration
               award resulting from the process set forth in this Section 34.2
               shall be limited as provided in this Agreement or in any
               Confirmation Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   65
Western Systems Power Pool                                 Original Sheet No. 56
Rate Schedule FERC No. 6

               34.3   COSTS

                      Each Party shall be responsible for its own costs and
               those of its counsel and representatives. The Parties shall
               equally divide the costs of the arbitrator or mediator and the
               hearing.

        34.4   CONFIDENTIALITY

                      Any arbitration or mediation under this Section 34 shall
               be conducted on a confidential basis and not disclosed, including
               any documents or results which shall be considered confidential,
               unless the Parties otherwise agree or such disclosure is required
               by law.

35.     FORWARD CONTRACTS:

               The Parties acknowledge and agree that all transactions under the
        Agreement and Confirmation Agreement(s) are forward contracts and that
        the Parties are forward contract merchants, as those terms are used in
        the United States Bankruptcy Code. The Parties acknowledge and agree
        that all of their transactions, together with this Agreement and the
        related Confirmation Agreement(s) form a single, integrated agreement,
        and agreements and transactions are entered into in reliance on the fact
        that the agreements and each transaction form a single agreement between
        the Parties.

36.     TRADE OPTION EXCEPTION

               The Parties intend that any Physically Settled Option under this
        Agreement shall qualify under the trade option exception, 17 C.F.R.
        Section 32.4. Accordingly, each Party buying or selling a Physically
        Settled Option agrees and warrants that any such option

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   66
Western Systems Power Pool                               Original Sheet No. 57
Rate Schedule FERC No. 6

        shall be offered only to a provider, user, or merchant and that the
        entities entering into the options are doing so solely for purposes
        related to their business.

37.     ADDITIONAL REPRESENTATIONS AND WARRANTIES:

               Each Party warrants and represents to the other(s) that it
        possesses the necessary corporate, governmental and legal authority,
        right and power to enter into and agree to the applicable Confirmation
        Agreement for a transaction or transactions and to perform each and
        every duty imposed, and that the Parties' agreement to buy and sell
        power under this Agreement and the Confirmation Agreement represents a
        contract. Each Party also warrants and represents to the other(s) that
        each of its representatives executing or agreeing through a Confirmation
        Agreement to a transaction under this Agreement is authorized to act on
        its behalf.

               Each Party further warrants and represents that entering into and
        performing this Agreement and any applicable Confirmation Agreement does
        not violate or conflict with its Charter, By-laws or comparable
        constituent document, any law applicable to it, any order or judgment of
        any court or other agency of government applicable to it or any
        agreement to which it is a party and that this Agreement and applicable
        Confirmation Agreement(s), constitute a legal, valid and binding
        obligation enforceable against such Party in accordance with the terms
        of such agreements.

               Each Party also represents that it is solvent and that on each
        delivery this representation shall be deemed renewed unless notice to
        the contrary is given in writing by the Purchaser to the Seller before
        delivery.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   67
Western Systems Power Pool                                 Original Sheet No. 58
Rate Schedule FERC No. 6

38.     AMENDMENT:

        38.1   This Agreement may be amended upon the submission to FERC and
               acceptance by FERC of that amendment. The Parties through the
               Executive Committee shall direct the filing of any amendments.
               The Parties to this Agreement agree to bound by this Agreement as
               it may be amended, provided that the Parties possess the right to
               challenge any amendments at FERC and to exercise any applicable
               withdrawal rights under this Agreement.

        38.2   Unless otherwise stated in the amendment, all amendments shall
               apply only to new transactions entered into or agreed to on or
               after the effective date of the amendment. Preexisting agreements
               and transactions shall operate under the version of the WSPP
               Agreement effective at the time of the agreement for the
               transaction unless the Parties to a transaction or transactions
               mutually agree otherwise.

        38.3   An agreement modifying this Agreement or a Confirmation Agreement
               for a transaction needs no consideration to be binding.

39.     EXECUTION BY COUNTERPARTS:

               This Agreement may be executed in any number of counterparts, and
        upon execution by all Parties, each executed counterpart shall have the
        same force and effect as an original instrument and as if all Parties
        had signed the same instrument. Any signature page of this Agreement may
        be detached from any counterpart of this Agreement without impairing the
        legal effect of any signatures thereon, and may be attached to another

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   68
Western Systems Power Pool                                 Original Sheet No. 59
Rate Schedule FERC No. 6

        counterpart of this Agreement identical in form hereto but having
        attached to it one or more signature pages.

40.     WITNESS:

               IN WITNESS WHEREOF, the Parties have caused this Agreement to be
        executed by their duly authorized representative as of the 27th day of
        July, 1991 (or as of the date of execution of this Agreement by each
        Party's duly authorized representation, in the case of any Party that
        becomes a signatory to this Agreement subsequent to July 27, 1991).

                       By:________________________________
                          Name:
                          Title:

<PAGE>   69
Western Systems Power Pool                                 Original Sheet No. 60
Rate Schedule FERC No. 6

                                    EXHIBIT A

                                     NETTING

        Each Party that executes this Exhibit A to the Agreement agrees to net
payments for transactions under WSPP Service Schedule A, B, and C with any other
Party or Parties which also have agreed to net payments by executing a copy of
this Exhibit A. The Party executing this Exhibit A shall indicate below when it
desires that its agreement to net becomes effective. A Party agreeing to net
under this Exhibit A shall comply with the provisions of Section 28.2 of the
Agreement. Defined terms used herein are as defined in the WSPP Agreement.
Netting shall be done in accordance with the following provision:

               If the Purchaser and Seller are each required to pay an amount on
               the payment due date in the same month for transactions under the
               Agreement or Confirmation Agreement, then such amounts with
               respect to each Party will be aggregated and the Parties will
               discharge their obligations to pay through netting, in which case
               the Party owing the greater aggregate amount will pay to the
               other party the difference between the amounts owed consistent
               with the payment times in Section 9.2 of the Agreement, unless
               the Parties have otherwise agreed to a different payment time as
               allowed by the Agreement. Each Party reserves to itself all
               rights, set-offs, counterclaims and other remedies and/or
               defenses to which it is or may be entitled, arising from or out
               of the Agreement. All outstanding payments between the Parties
               which are to be netted pursuant to this Exhibit A for
               transactions under WSPP Service Schedule A, B, and C shall be
               offset against each other or set off or recouped therefrom.

----------------------------------          --------------------------
Name of Authorized Representative           Effective Date for Netting

----------------------------------
Name of WSPP Member

----------------------------------          --------------------------
Signature of Authorized                     Date of Execution
Representative

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   70
Western Systems Power Pool                                 Original Sheet No. 61
Rate Schedule FERC No. 6

       [WSPP SAMPLE FORM -- PARTIES ARE FREE TO USE THIS OR DISREGARD IT.]

                                    EXHIBIT B

FORM OF COUNTERPARTY GUARANTEE AGREEMENT

        This Guarantee Agreement (this "Guarantee"), dated, as of [__________],
199[__], is made and entered into by [_____________], a [__________] corporation
("Guarantor").

                                   WITNESSETH:

        WHEREAS, [___________________] (the "Company") may enter into
transactions involving power sales under the Western Systems Power Pool ("WSPP
Agreement") and related confirmation agreements1 (collectively "Agreements")
with [Company Name] ("Guaranteed Party"); and

        WHEREAS, Guarantor will directly or indirectly benefit from the
Agreements.

        NOW THEREFORE, in consideration of the Guaranteed Party agreeing to
conduct business with Company, Guarantor hereby covenants and agrees as follows:

        1. GUARANTY. Subject to the provisions hereof, Guarantor hereby
irrevocably and unconditionally guarantees the timely payment when due of the
obligations of Company (the "Obligations") to the Guaranteed Party in accordance
with the Agreements. If Company fails to pay any Obligations, Guarantor shall
promptly pay to the Guaranteed Party no later than the next Business Day (as
defined in the WSPP Agreement), after notification, the amount due in the same
currency and manner provided for in the Agreements. This Guarantee shall
constitute a guarantee of payment and not of collection. Guarantor shall have no
right of subrogation with respect to any payments it makes under this Guarantee
until all of the Obligations of Company to the Guaranteed Party are paid in
full. The liability of Guarantor under the Guarantee shall be subject to the
following:

            (a) Guarantor's liability hereunder shall be and is specifically
limited to payments expressly required to be made in accordance with the
Agreements (even if such payments are deemed to be damages) and, except to the
extent specifically provided in the Agreements, in no event shall Guarantor be
subject hereunder to consequential, exemplary, equitable, loss of profits,
punitive, tort, or any other even if such fees together with the payments

----------
1

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   71
Western Systems Power Pool                                 Original Sheet No. 62
Rate Schedule FERC No. 6

exceed the cap in Section 1(b), damages, costs, except that Guarantor shall be
required to pay reasonable attorney fees.

            (b) The aggregate liability of the Guarantor shall not exceed
[_____] Million U.S. Dollars [___________].

        2. DEMANDS AND NOTICE. If Company fails or refuses to pay any
Obligations, the Guaranteed Party may make a demand upon Guarantor (hereinafter
referred to as a "Payment Demand"). A Payment Demand shall be in writing and
shall reasonably and briefly specify in what manner and what amount Company has
failed to pay and an explanation of why such payment is due, with a specific
statement that the Guaranteed Party is calling upon Guarantor to pay under this
Guarantee. A Payment Demand satisfying the foregoing requirements shall be
deemed sufficient notice to Guarantor that it must pay the Obligations. A single
written Payment Demand shall be effective as to any specific default during the
continuance of such default, until Company or Guarantor has cured such default,
and additional Payment Demands concerning such default shall not be required
until such default is cured.

        3. REPRESENTATIONS AND WARRANTIES. Guarantor represents and warrants
that:

            (a) it is a corporation duly organized and validly existing under
the laws of the State of [_____________] and has the corporate power and
authority to execute, deliver and carry out the terms and provisions of this
Guarantee;

            (b) no authorization, approval, consent or order of, or registration
or filing with, any court or other governmental body having jurisdiction over
Guarantor is required on the part of Guarantor for the execution and delivery of
this Guarantee; and

            (c) this Guarantee constitutes a valid and legally binding agreement
of Guarantor enforceable against Guarantor in accordance with its terms, except
as the enforceability of this Guarantee may be limited by the effect of any
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
affecting creditors' rights generally and by general principles of equity.

        4. EFFECT OF BANKRUPTCY BY COMPANY. The Guarantor's obligation to pay
under this Guarantee shall not be affected in any way by the institution with
respect to the Company of a bankruptcy, reorganization, moratorium or similar
insolvency proceeding or other relief under any bankruptcy or insolvency law
affecting creditor's rights or a petition for the Company's winding-up or
liquidation.

        5. AMENDMENT. No term or provision of this Guarantee shall be amended,
modified, altered, waived, or supplemented except in a writing signed by the
Guarantor and Guaranteed Party hereto.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   72
Western Systems Power Pool                                 Original Sheet No. 63
Rate Schedule FERC No. 6

        6. WAIVERS. Guarantor hereby waives (a) notice of acceptance of this
Guarantee; (b) presentment and demand concerning the liabilities of Guarantor,
except as expressly hereinabove set forth; and (c) any right to require that any
action or proceeding be brought against Company or any other person, or except
as expressly hereinabove set forth, to require that the Guaranteed Party seek
enforcement of any performance against Company or any other person, prior to any
action against Guarantor under the terms hereof.

        Except as to applicable statutes of limitation, no delay of the
Guaranteed Party in the exercise of, or failure to exercise, any rights
hereunder shall operate as a waiver of such rights, a waiver of any other rights
or a release of Guarantor from any obligations hereunder.

        Guarantor consents to the renewal, compromise, extension, acceleration
or other changes in the time of payment of or other changes in the terms of the
Obligations, or any part thereof or any changes or modifications to the terms of
the Agreements.

        Guarantor may terminate this Guarantee by providing written notice of
such termination to the Guaranteed Party and upon the effectiveness of such
termination, Guarantor shall have no further liability hereunder, except as
provided in the last sentence of this paragraph. No such termination shall be
effective until fifteen (15) Business Days after receipt by the Guaranteed Party
of such termination notice. No such termination shall affect Guarantor's
liability with respect to any obligations arising under any transaction entered
into prior to the time the termination is effective, which transaction shall
remain guaranteed pursuant to the terms of this Guarantee.

        7. ASSIGNMENT. The Guarantor shall not assign this Guarantee without the
express written consent of the Guaranteed Party. The Guaranteed Party shall be
entitled to assign its rights under this Agreement in its sole discretion.

        8. NOTICE. Any Payment Demand, to the Guaranteed Party or the Guarantor
notice, request, instruction, correspondence or other document to be given
hereunder by any party to another (herein collectively called "Notice") shall be
in writing and delivered personally or mailed by certified mail, postage prepaid
and return receipt requested, or by telegram or telecopier, as follows:

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   73
Western Systems Power Pool                                 Original Sheet No. 64
Rate Schedule FERC No. 6

        To [Name of Guaranteed Party]               ____________________________
                             _______________________________
                             _______________________________
                             Attn:  ________________________
                             Fax No.: (___) ________________

        To Guarantor:        _______________________________
                             _______________________________
                             _______________________________
                             Attn:  ________________________
                             Fax No.: (___) ________________

        Notice given by personal delivery or mail shall be effective upon actual
receipt. Notice given by telegram or telecopier shall be effective upon actual
receipt if received during the recipient's normal business hours, or at the
beginning of the recipient's next business day after receipt if not received
during the recipient's normal business hours. All Notices by telegram or
telecopier shall be confirmed promptly after transmission in writing by
certified mail or personal delivery. Any party may change any address to which
Notice is to be given to it by giving notice as provided above of such change of
address.

        8. MISCELLANEOUS. THIS GUARANTEE SHALL IN ALL RESPECTS BE GOVERNED BY,
AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF [State], WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAWS. This Guarantee shall be binding upon
Guarantor, its successors and assigns and inure to the benefit of and be
enforceable by the Guaranteed Party, its successors and assigns. The Guarantee
embodies the entire agreement and understanding between Guarantor and the
Guaranteed Party and supersedes all prior agreements and understandings relating
to the subject matter hereof. The headings in this Guarantee are for purposes of
reference only, and shall not affect the meaning hereof. This Guarantee may be
executed in any number of counterparts, each of which shall be an original, but
all of which together shall constitute one instrument.

EXECUTED as of the day and year first above written.

                          [_____________________________]
                          By: __________________________
                          Name: ________________________
                          Title: _______________________

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   74
Western Systems Power Pool                            First Revised Sheet No. 65
Rate Schedule FERC No. 6                       Superseding Original Sheet No. 65

                                    EXHIBIT C
                          SAMPLE FORM FOR CONFIRMATION

1.      TRANSACTION SPECIFIC AGREEMENTS

               The undersigned Parties agree to sell and purchase electric
        energy, or a Physically-Settled Option, pursuant to the WSPP Agreement
        as it is supplemented and modified below:

        (a)    Seller:__________________________________

        (b)    Purchaser:  __________________________________

        (c)    Period of Delivery:  From __\__\__  To  __\__\__

        (d)    Schedule (Days and Hours):  __________________

        (e)    Delivery Rate:________________________________

        (f)    Delivery Point(s):  __________________________

        (g)    Type of Service (Check as Applicable)

                      Service Schedule A _________

                      Service Schedule B _________

                      Service Schedule C _________

                      Physically-Settled Option Service Schedule B ______

                      Physically-Settled Option Service Schedule C ______

        (h)    Contract Quantity:  ________ Total MWhrs.

        (i)    Contract or Strike Price:  _____________________

        (j)    Transmission Path for the Transaction (If Applicable):

        (k)    Date of Agreement if different:  _____________

        (l)    Additional Information for Physically-Settled Options

               (i)    Option Type:  Put __________ Call______________

               (ii)   Option Style: __________

               (iii)  Exercise Date or Period: __________

               (iv)   Premium:          __________

               (v)    Premium Payment Date:  _________

               (vi)   Method for providing notice of exercise _________________

        (m)    Special Terms and Exceptions:
               See Attachment A

[Special Terms and Exceptions shall be shown on an Attachment to this
Confirmation.]

------------------------------      ---------------------------
Name of Trader for Purchaser        Name of Trader for Seller

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   75
Western Systems Power Pool                                 Original Sheet No. 66
Rate Schedule FERC No. 6

---------------------------         ---------------------------
Authorized Signature                Authorized Signature
     for Purchaser                       for Seller

---------------------------         ---------------------------
Date                                Date

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   76
Western Systems Power Pool                                 Original Sheet No. 67
Rate Schedule FERC No. 6

                                    EXHIBIT D

                    WSPP MEDIATION AND ARBITRATION PROCEDURES

I.      MEDIATION

        A.     INFORMAL MEDIATION. WSPP members with a dispute or a potential
               dispute involving transactions under the WSPP Agreement may
               request non-binding, informal mediation by contacting the WSPP's
               General Counsel and by providing a brief explanation in writing
               of the dispute and the remedy being sought. All parties to the
               dispute must request this Informal Mediation for it to become
               effective. After this contact, a telephonic conference call will
               be arranged among the affected WSPP members and the WSPP's
               General Counsel, the Chairman of the Operating Committee, and/or
               some other independent and knowledgeable person requested by the
               Chairman of the Operating Committee to participate. The purpose
               of the conference call will be to discuss the issues and to have
               an independent person or persons state their views. Best efforts
               will be made to set up this conference call within five Business
               Days after the WSPP's General Counsel is contacted subject to
               accommodating the schedules of all involved. This Informal
               Mediation shall be considered as satisfying the Mediation
               requirements of Section 34.1 of the WSPP Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   77
Western Systems Power Pool                                 Original Sheet No. 68
Rate Schedule FERC No. 6

        B.     INITIATING FORMAL MEDIATION. A WSPP member which believes that it
               possesses a claim against another WSPP member relating to a WSPP
               transaction, which is unable to resolve the dispute through
               agreement with the other member to the transaction, and which
               desires to pursue that claim shall initiate non-binding formal
               mediation pursuant to Section 34.1 of the WSPP Agreement. The
               member initiating such mediation shall do so by Serving written
               notice to the Chairman of the WSPP Operating Committee, the
               WSPP's General Counsel, and the other members against which the
               claim is directed. Such notice shall state the nature of the
               dispute, the remedy sought, and support the claim.

        C.     RESPONSE TO DOCUMENT INITIATING FORMAL MEDIATION. Within eight
               days, the member or members against which the claim is directed
               may provide a response to the notice which shall be Served on the
               member which initiated the Mediation, the Chairman of the WSPP's
               Operating Committee, and the WSPP's General Counsel.

        D.     CHOOSING THE MEDIATOR. The Mediator shall be chosen in accordance
               with the procedures set forth in Section 34.1 of the WSPP
               Agreement. Each Party may suggest persons to be included on the
               list of Mediators to be presented to the Parties provided that
               these suggested persons shall be provided to the WSPP
               Representative together with relevant personal histories within
               two Business Days

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   78
Western Systems Power Pool                                 Original Sheet No. 69
Rate Schedule FERC No. 6

               of the date by which time the list of Mediators is to be sent
               out. The WSPP Representative shall allow at least one person
               suggested by each Party to be added to the list of Mediators. A
               brief personal history of each person on the list of potential
               mediators shall be provided to the Parties, with that history
               showing the person's employment over the last five years and any
               other relevant facts. The WSPP Representative shall provide the
               Parties with the list of Mediators within five days of receipt of
               notice of the dispute. The Parties then shall have five days in
               which to reach agreement on a Mediator or inform the WSPP
               Representative that they were unable to reach agreement in which
               event the WSPP Representative shall appoint the Mediator
               consistent with Section 34.1 of the WSPP Agreement. Upon request
               of the Parties for expedition, the WSPP Representative shall use
               best efforts to expedite this process.

        E.     LOCATION FOR THE FORMAL MEDIATION. The Parties shall agree on a
               location for the Mediation. If the Parties fail to reach
               agreement, then the WSPP Representative shall set the location
               which shall be convenient for the Parties and the Mediator.

        F.     TIME FOR THE FORMAL MEDIATION. The Parties shall agree on the
               time for the Mediation after consultation with the Mediator if
               one has been appointed. If the Parties fail to reach agreement,
               then the WSPP Representative shall set the time

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   79
Western Systems Power Pool                                 Original Sheet No. 70
Rate Schedule FERC No. 6

               which shall not be more than twenty-one days after the notice
               initiating the Mediation is received after consultation with the
               Parties and any Mediator.

        G.     CONDUCT OF THE FORMAL MEDIATION. The Mediator shall have the
               ability to conduct the Mediation in any manner which the Mediator
               believes is appropriate to facilitate resolution of the dispute.
               Each Party shall have at least one representative with the
               authority to settle the dispute present at the Mediation. The
               Mediation shall be private and confidential and the Mediator
               shall have the authority to exclude any person not directly
               involved unless the Parties agree otherwise in writing. At the
               Mediation, each Party shall have the right to make a brief
               presentation of its case and to question the other Party. Each
               Party also may be represented by counsel.

        H.     REPLACEMENT OF THE MEDIATOR. If the Mediator resigns, withdraws
               or is no longer able to serve, then the Parties shall have two
               Business Days in which to agree on a new Mediator. If the Parties
               are unable to agree within such time, the WSPP Representative
               shall appoint a replacement Mediator from the list used to select
               the first Mediator within two Business Days after being notified
               that the Parties are unable to agree. The dates and deadlines in
               this section may require modification if the mediator is
               replaced. Any extensions shall be as limited as possible.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   80
Western Systems Power Pool                                 Original Sheet No. 71
Rate Schedule FERC No. 6

II.     ARBITRATION

        A.     INITIATING ARBITRATION. A WSPP member which initiates Arbitration
               pursuant to Section 34.2 of the WSPP Agreement shall do so by
               Serving the Chairman of the WSPP Operating Committee, the WSPP
               General Counsel and the members against which the claim is
               directed with written notice of its demand for arbitration. Such
               notice shall state the nature of the dispute, the remedy sought,
               and support the claim.

        B.     RESPONSE. Within ten days of receipt of the notice, any member or
               members against which the claim is directed may provide a
               response to the notice. Such response must include any
               counterclaims which the member believes are appropriate. If a
               counterclaim is submitted, then the member which submitted the
               notice may respond to the counterclaim within ten days of
               receipt. All such responses shall be Served on the Parties, the
               Chairman of the WSPP Operating Committee, and the WSPP General
               Counsel.

        C.     CHOOSING THE ARBITRATOR. The Arbitrator shall be chosen in
               accordance with the procedures set forth in Section 34.2 of the
               WSPP Agreement. Each Party may suggest persons to be included on
               the list of Arbitrators to be presented to the Parties provided
               that these suggested persons are provided to the WSPP
               Representative together with relevant personal histories within
               two business days

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   81
Western Systems Power Pool                                 Original Sheet No. 72
Rate Schedule FERC No. 6

               of the date by which time the list of Arbitrators is to be sent
               out. The WSPP Representative shall allow at least one person
               suggested by each Party to be added to the list of potential
               Arbitrators. A brief personal history of each person on the list
               of potential Arbitrators shall be provided to the Parties, with
               that history showing the person's employment over the last five
               years and any other relevant facts. The WSPP Representative shall
               provide the Parties with the list of Arbitrators within seven
               days of receipt of notice of the request for Arbitration. The
               Parties then shall have ten days in which to reach agreement on
               the Arbitrator or to inform the WSPP Representative that they
               were unable to reach agreement in which event the WSPP
               Representative shall appoint the Arbitrator consistent with
               Section 34.2 of the Agreement. Upon request of the Parties for
               expedition, the WSPP Representative shall use best efforts to
               cause this process to be expedited.

        D.     LOCATION FOR THE ARBITRATION. The Parties shall agree on a
               location for the Arbitration. If the Parties fail to reach
               agreement, then the WSPP Representative shall set the location
               which shall be convenient for the Parties and the Arbitrator.

        E.     TIME FOR THE ARBITRATION. The Parties shall agree on the time for
               the Arbitration and coordinate that time with the Arbitrator if
               one has been agreed to or appointed. If the Parties fail to reach
               agreement, then the WSPP Representative

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   82
Western Systems Power Pool                                 Original Sheet No. 73
Rate Schedule FERC No. 6

               shall set the time which shall not be more than 60 days after the
               notice is received. The WSPP Representative shall set a time
               after consultation with the Parties and the Arbitrator to check
               their schedules.

        F.     DISCOVERY. After appointment of the Arbitrator, each Party shall
               be entitled to obtain relevant documents from the other Parties
               and to take depositions. Each Party shall respond to such a
               document request within seven days of receipt of the request and
               make its employees or consultants available for depositions to
               the extent that the employee or consultant possesses knowledge
               and information relevant to the dispute. Each Party shall
               disclose documents that are confidential or commercially
               sensitive subject to a reasonable protective order. Any disputes
               concerning discovery shall be promptly referred to the Arbitrator
               who shall have authority to resolve such disputes, including the
               authority to require attendance of witnesses at depositions. The
               Federal Rules of Civil Procedure shall apply to discovery under
               these procedures.

        G.     CONDUCT OF ARBITRATION IF THE PARTIES AGREE TO WAIVE AN ORAL
               HEARING. If the Parties agree to waive an oral hearing, then the
               Parties shall Serve Initial Briefs no later than 35 days after
               the notice is received or notify the Arbitrator that they do not
               wish to submit any additional documents. Parties shall Serve any
               Reply Briefs no later than ten days after the date for Service of
               Initial Briefs.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   83
Western Systems Power Pool                                 Original Sheet No. 74
Rate Schedule FERC No. 6

        H.     CONDUCT OF THE ARBITRATION HEARING. No later than fifteen days
               before any hearing, any Party may Serve an Initial Brief or
               notify the Arbitrator that they do not wish to submit any
               additional documents. A Party shall Serve any Reply Brief no
               later than five Business Days before any hearing. The Arbitrator
               shall preside over any hearing and rule on all objections
               including objections as to the admissibility of evidence or
               whether the questioning is proper. All testimony shall be
               submitted under oath. The Arbitrator is not bound to follow any
               particular rules governing the conduct of the proceeding. The
               Arbitrator may rely on legal advice provided through the WSPP.
               The Arbitrator may require any person employed by a Party to
               attend and testify at the hearing. Each Party shall possess the
               right to present evidence, including witnesses, and to
               cross-examine other Parties' witnesses. The Arbitration shall be
               private and the Arbitrator shall have the authority to exclude
               any person not directly involved unless the Parties otherwise
               agree. Each Party may be represented by counsel. A stenographic
               record of the Arbitration shall be kept.

        I.     DECISION. Within ten Business Days after the end of the
               Arbitration hearing, the Arbitrator shall issue his award in
               writing. If the Parties waived the right to an oral hearing, then
               the Arbitrator shall issue the award within ten Business Days of
               the last date Briefs were to be submitted. The Arbitrator is not
               limited in the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   84
Western Systems Power Pool                                 Original Sheet No. 75
Rate Schedule FERC No. 6

               remedies he may order so long as any arbitration award is
               consistent with the provisions and limitations of the WSPP
               Agreement and any applicable Confirmation Agreement with respect
               to the liability and damages of any Party; provided, however,
               upon agreement of the Parties to the dispute, the Arbitrator's
               choice of remedies may be limited.

        J.     REPLACEMENT OF THE ARBITRATOR. If the Arbitrator resigns,
               withdraws, or is no longer able to serve then the Parties shall
               have two Business Days in which to agree on a new Arbitrator. If
               the Parties are unable to agree within such time, the WSPP
               Representative shall appoint a replacement Arbitrator from the
               list used to select the first Arbitrator within two Business Days
               after being notified that the Parties are unable to agree. The
               dates and deadlines in this section may require modification if
               the mediator is replaced. Any extensions shall be as limited as
               possible.

III.    MISCELLANEOUS

        A.     CONFIDENTIALITY. Any Arbitration or Mediation shall be
               confidential as provided in Section 34.4 of the WSPP Agreement.

        B.     COSTS. Costs shall be borne by Parties as provided in Section
               34.3 of the WSPP Agreement.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   85
Western Systems Power Pool                                 Original Sheet No. 76
Rate Schedule FERC No. 6

        C.     RESTRICTIONS ON LAWSUITS. Each Party shall be subject to the
               restrictions provided in Section 34.2 of the WSPP Agreement.

        D.     ATTORNEY-CLIENT/ATTORNEY WORKPRODUCT. The Arbitrator or Mediator
               shall not take any action which would result in disclosure of
               information in violation of the attorney-client privilege or
               attorney workproduct doctrine.

IV.     DEFINITIONS

        A.     ARBITRATOR OR ARBITRATION. The Arbitrator appointed pursuant to
               these procedures and Section 34.2 of the WSPP Agreement and the
               Arbitration pursuant to these procedures and the WSPP Agreement.

        B.     INITIAL OR REPLY BRIEFS. Written documents submitted by the
               Parties to support their positions and respond to each others
               positions. Such documents shall be limited to 25 pages.

        C.     BUSINESS DAYS. Defined as in the WSPP Agreement.

        D.     MEDIATOR OR MEDIATION. The Mediator appointed pursuant to these
               procedures and Section 34.1 of the WSPP Agreement and the
               Mediation pursuant to these procedures and the WSPP Agreement.

        E.     PARTIES. The WSPP members involved in the Mediation or
               Arbitration which have a direct interest in the dispute.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   86
Western Systems Power Pool                                 Original Sheet No. 77
Rate Schedule FERC No. 6

        F.     SERVICE, SERVING, OR SERVED. The method of service shall be by
               fax, unless impracticable because of the size of the document. In
               all events, the document should be delivered to the Party by
               overnight mail. Parties also should attempt to send the document
               out by email if possible. Service will be accomplished to a Party
               if sent to the Party's contact person for the disputed
               transaction. If there are multiple contact persons for one Party,
               service to one such person shall suffice. Service shall be to
               those individuals or entities specified in this procedures, but
               must include service to the Parties, the Mediator or Arbitrator
               (if either has been appointed), and to the WSPP General Counsel.

        G.     WSPP REPRESENTATIVE. The Chairman of the WSPP Operating Committee
               or his or her designee for the purposes of the Arbitration or
               Mediation.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   87
Western Systems Power Pool                                 Original Sheet No. 78
Rate Schedule FERC No. 6

                               SERVICE SCHEDULE A

                             ECONOMY ENERGY SERVICE

A-1     PARTIES:

        This Service Schedule is agreed upon as a part of this Agreement by the
Parties.

A-2 PURPOSE:

        The purpose of this Service Schedule is to define additional specific
        procedures, terms and conditions for requesting and providing Economy
        Energy Service.

A-3     TERMS:

        A-3.1  A Party may schedule Economy Energy Service from another Party by
               mutual agreement; provided, however, that each Party shall be the
               sole judge as to the extent to and the conditions under which it
               is willing to provide or receive such service hereunder
               consistent with statutory requirements and contractual
               commitments including the Agreement and any applicable
               Confirmation Agreement.

        A-3.2  Scheduling of Economy Energy Service hereunder shall be a
               responsibility of the Parties involved.

        A-3.3  Each Seller/Purchaser may prepare a daily estimate of the amount
               of Economy Energy Service that it is willing and able to sell/buy
               each hour and the associated hourly sale/purchase price for the
               next Business Day, plus the weekend and

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   88
Western Systems Power Pool                                 Original Sheet No. 79
Rate Schedule FERC No. 6

               holidays, and communicate this information to all other Parties
               via the Hub.

        A-3.4  Purchasers shall arrange purchases directly with Sellers, and
               shall be responsible for transmission arrangements.

        A-3.5  Unless otherwise mutually agreed between the Purchaser and the
               Seller, all Economy Energy Service transactions shall be
               pre-scheduled, and billings shall be based on amounts and prices
               agreed to in advance by schedulers, subject to Paragraphs A-3.6
               and 3.7 and subject to change by mutual agreement between
               dispatchers or schedulers due to system changes.

        A-3.6  The price for Economy Energy Service shall be mutually agreed to
               in advance between Seller and Purchaser and shall not be subject
               to the rate caps specified in Section A-3.7 in either of the
               following two circumstances:

               (1)    where the Seller is a FERC regulated public utility and
                      that Seller has been authorized to sell power like that
                      provided for under this Service Schedule at market-based
                      rates; or

               (2)    where the Seller is not a FERC regulated public utility. A
                      Party is a FERC regulated public utility if it is a
                      "public utility" as defined in Section 201(e) of the
                      Federal Power Act, 16 U.S.C. Section 824(e).

        A-3.7  Except as provided for in Section A-3.6, the price shall not
               exceed the Seller's forecasted Incremental Cost plus up to:
               $7.32/kW/ month; $1.68/kW/week;

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   89
Western Systems Power Pool                                 Original Sheet No. 80
Rate Schedule FERC No. 6

               33.78cents/kW/day; 14.07 mills/kWh; or 21.11 mills/kWh for
               service of sixteen (16) hours or less per day. The hourly rate is
               capped at the Seller's forecasted Incremental Cost plus
               33.78cents/kW/ day. The total demand charge revenues in any
               consecutive seven-day period shall not exceed the product of the
               weekly rate and the highest demand experienced on any day in the
               seven-day period. In lieu of payment, such Parties may mutually
               agree to exchange economy energy at a ratio not to exceed that
               ratio provided for in Section C-3.7 of Service Schedule C. The
               Seller's forecasted Incremental Cost discussed above also may
               include any transmission and/or ancillary service costs
               associated with the sale, including the cost of any transmission
               and/or ancillary services that the Seller must take on its own
               system. Any such transmission and/or ancillary services charges
               shall be separately identified by the Seller to the Purchaser for
               transactions under this Schedule including the exchange of
               economy energy. The transmission and ancillary service rate
               ceilings shall be available through the WSPP's Hub or homepage.
               Any such transmission services (and ancillary service provided in
               conjunction with such transmission service) by Seller shall be
               provided pursuant to any applicable transmission tariff or
               agreement, and the rates therefore shall be consistent with such
               tariff or agreement.

        A-3.8  Unless otherwise agreed, the Purchaser shall be responsible for
               maintaining

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   90
Western Systems Power Pool                                 Original Sheet No. 81
Rate Schedule FERC No. 6

               operating reserve requirements as back-up for Economy Energy
               Service purchased and the Seller shall not be required to
               maintain such operating reserve.

        A-3.9  Each Party that is a FERC regulated public utility as defined in
               A-3.6 shall file the Confirmation Agreement with FERC for each
               transaction under this Service Schedule with a term in excess of
               one year no later than 30 days after service begins if that Party
               would have been required to file such Confirmation Agreements or
               similar agreements with FERC under an applicable FERC accepted
               market based rate schedule.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   91
Western Systems Power Pool                                 Original Sheet No. 82
Rate Schedule FERC No. 6

                               SERVICE SCHEDULE B
                             UNIT COMMITMENT SERVICE

B-1     PARTIES:

        This Service Schedule is agreed upon as part of this Agreement by the
Parties.

B-2     PURPOSE:

        The purpose of this Service Schedule is to define additional specific
        procedures, terms, and conditions for requesting and providing Unit
        Commitment Service.

B-3     TERMS:

        B-3.1  A Party may schedule Unit Commitment Service from another Party
               by mutual agreement; provided, however, that each Party shall be
               the sole judge as to the extent to and the conditions under which
               it is willing to provide or receive such service hereunder
               consistent with statutory requirements and contractual
               commitments including the Agreement and any applicable
               Confirmation Agreement. Once an agreement is reached, then the
               obligation for Unit Commitment Service becomes a firm commitment,
               for both Parties, for the agreed capacity and terms.

        B-3.2  Unless otherwise mutually agreed by the Parties involved in a
               Unit Commitment Service transaction, the terms set forth in this
               Service Schedule B shall govern such transaction.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   92
Western Systems Power Pool                                 Original Sheet No. 83
Rate Schedule FERC No. 6

        B-3.3  Unless otherwise agreed between the Purchaser and the Seller, all
               transactions shall be prescheduled, subject to any conditions
               agreed to by schedulers, for a specified unit for a specified
               period of time.

        B-3.4  Purchasers shall arrange purchases directly with Sellers.

        B-3.5  The price for Unit Commitment Service shall be mutually agreed to
               in advance between Seller and Purchaser and shall not be subject
               to the rate caps specified in Section B-3.6 in either of the
               following two circumstances:

               (1)    where the Seller is a FERC regulated public utility and
                      that Seller has been authorized to sell power like that
                      provided for under this Service Schedule at market-based
                      rates; or

               (2)    where the Seller is not a FERC regulated public utility.

                      A Party is a FERC regulated public utility if it is a
               "public utility" as defined in Section 201(e) of the Federal
               Power Act, 16 U.S.C. Section 824(e). B-3.6 Except as provided for
               in Section B-3.5, the price shall not exceed the Seller's
               forecasted Incremental Cost plus up to: $7.32/kW/month;
               $1.68/kW/week; 33.78cents/kW/day; 14.07 mills/kWh; or 21.11
               mills/kWh for service of sixteen (16) hours or less per day. The
               hourly rate is capped at the Seller's forecasted Incremental Cost
               plus 33.78cents/kW/day. The total demand charge revenues in any
               consecutive seven-day period shall not exceed the product of the
               weekly rate and the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   93
Western Systems Power Pool                               Original Sheet No. 84
Rate Schedule FERC No. 6

               highest demand experienced on any day in the seven-day period.
               The Seller's forecasted Incremental Cost discussed above also may
               include any transmission and/or ancillary service costs
               associated with the sale, including the cost of any transmission
               and/or ancillary services that the Seller must take on its own
               system. Any such transmission and/or ancillary service charges
               shall be separately identified by the Seller to the Purchaser.
               The transmission and ancillary service rate ceilings shall be
               available through the WSPP's Hub or homepage.

        B-3.7  Start-up costs and no-load costs if included by the Seller shall
               be stated separately in the price.

        B-3.8  Energy schedules for the Purchaser's share of a unit may be
               modified by the Purchaser with not less than a thirty (30) minute
               notice before the hour in which the change is to take place,
               unless otherwise mutually agreed or unforeseen system operating
               conditions occur.

        B-3.9  Unit Commitment Service is intended to have assured availability;
               however, scheduled energy deliveries may be interrupted or
               curtailed as follows:

               (a)    By the Seller by giving proper recall notice to the
                      Purchaser if the Seller and the Purchaser have mutually
                      agreed to recall provisions,

               (b)    By the Seller when all or a portion of the output of the
                      unit is unavailable, by an amount in proportion to the
                      amount of the reduction in the output of the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   94
Western Systems Power Pool                               Original Sheet No. 85
Rate Schedule FERC No. 6

                      unit, unless otherwise agreed by the schedulers,

               (c)    By the Seller to prevent system separation during an
                      emergency, provided the Seller has exercised all prudent
                      operating alternatives prior to the interruption or
                      curtailment,

               (d)    Where applicable, by the Seller to meet its public utility
                      or statutory obligations to its customers, or

               (e)    By either the Seller or the Purchaser due to the
                      unavailability of transmission capacity necessary for the
                      delivery of scheduled energy.

        B-3.10 Each Party that is a FERC regulated public utility as defined
               above in B-3.5 shall file the Confirmation Agreement with FERC
               for each transaction under this Service Schedule with a term in
               excess of one year no later than 30 days after service begins if
               that Party would have been required to file such Confirmation
               Agreements or similar agreements with FERC under an applicable
               FERC accepted market based rate schedule.

B-4     BILLING AND PAYMENT PROVISIONS:

        B-4.1  Except as provided in Sections B-4.2 and B-5, billing for Unit
               Commitment Service shall be computed based upon the agreed upon
               prices.

        B-4.2  In the event the Seller requests recall of Unit Commitment
               Service in a shorter time frame than was mutually agreed pursuant
               to Section B-3.9(a) and the

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   95
Western Systems Power Pool                               Original Sheet No. 86
Rate Schedule FERC No. 6

               Purchaser agrees to allow such recall, the Purchaser shall be
               relieved of any obligation to pay start-up costs.

B-5     TERMINATION PROVISION:

        In the event Unit Commitment Service is curtailed or interrupted except
        as provided in Section B-3.9(a), the Purchaser shall have the option to
        cancel the Unit Commitment Service at any time by paying the Seller for
        (i) all energy deliveries scheduled up to the notice of termination and
        (ii) all separately stated start-up and no-load costs.

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: September 29, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   96
Western Systems Power Pool                          First Revised Sheet No. 87
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 87

                               SERVICE SCHEDULE C
                  FIRM CAPACITY/ENERGY SALE OR EXCHANGE SERVICE

C-1     PARTIES:

        This Service Schedule is agreed upon as a part of this Agreement by the

Parties. C-2 PURPOSE:

        The purpose of this Service Schedule is to define additional specific
        procedures, terms, and conditions for requesting and providing Firm
        Capacity/Energy Sale or Exchange Service.

C-3     TERMS:

        C-3.1  A Party may schedule Firm Capacity/Energy Sale or Exchange
               Service from another Party by mutual agreement; provided,
               however, that each Party shall be the sole judge as to the extent
               to and the conditions under which it is willing to provide or
               receive such service hereunder consistent with statutory
               requirements and contractual commitments including the Agreement
               and any applicable Confirmation Agreement. Once an agreement is
               reached, then the obligation for Firm Capacity/Energy Sale or
               Exchange Service becomes a firm commitment, for both Parties, for
               the agreed service and terms.

        C-3.2  Unless otherwise agreed between the Purchaser and the Seller, all
               transactions shall be prescheduled, subject to any conditions
               agreed to by schedulers.

        C-3.3  Firm capacity transactions shall include buying, selling, or
               exchanging capacity between Parties with or without associated
               energy. Firm capacity is deemed a capacity sale from the Seller's
               resources and backed by the Seller's

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   97
Western Systems Power Pool                          First Revised Sheet No. 88
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 88

               capacity reserves.

        C-3.4  Firm energy transactions shall include buying, selling, or
               exchanging firm energy between Parties. Subject to mutual
               agreement, firm energy is deemed a quantity of energy the Seller
               has agreed to sell and deliver and the Purchaser has agreed to
               buy within a specified time period.

        C-3.5  Purchaser shall arrange purchases directly with Sellers.

        C-3.6  The price for Firm Capacity/Energy Sale or Exchange Service shall
               be mutually agreed to in advance between Seller and Purchaser and
               shall not be subject to the rate caps specified in Section C-3.7
               in either of the following two circumstances:

               (1)    where the Seller is a FERC regulated public utility and
                      that Seller has been authorized to sell power like that
                      provided for under this Service Schedule at market-based
                      rates; or

               (2)    where the Seller is not a FERC regulated public utility. A
                      Party is a FERC regulated public utility if it is a
                      "public utility" as defined in Section 201(e) of the
                      Federal Power Act, 16 U.S.C. Section 824(e).

        C-3.7  Except as provided for in Section C-3.6, the price shall not
               exceed the Seller's forecasted Incremental Cost plus up to:
               $7.32/kW/month; $1.68/kW/week; 33.78cents/kW/day; 14.07
               mills/kWh; or 21.11 mills/kWh for service of sixteen (16) hours
               or less per day. The hourly rate is capped at the Seller's
               forecasted Incremental Cost plus 33.78cents/kW/day. The total
               demand charge revenues in any consecutive seven-day period shall
               not exceed the product of the weekly rate and the

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   98
Western Systems Power Pool                          First Revised Sheet No. 89
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 89

               highest demand experienced on any day in the seven-day period.
               Exchange ratios among such Parties shall be as mutually agreed
               between the Purchaser and the Seller, but shall not exceed the
               ratio of 1.5 to 1.0. The Seller's forecasted Incremental Cost
               discussed above also may include any transmission and/or
               ancillary service costs associated with the sale, including the
               cost of any transmission and/or ancillary services that the
               Seller must take on its own system. Any such transmission and/or
               ancillary service charges shall be separately identified by the
               Seller to the Purchaser for transactions under this Schedule
               including exchanges. The transmission and ancillary service rate
               ceiling shall be available through the WSPP's Hub or homepage.
               Any such transmission service (and ancillary services provided in
               conjunction with such transmission service) by Seller shall be
               provided pursuant to any applicable transmission tariff or
               agreement, and the rates therefore shall be consistent with such
               tariff or agreement.

        C-3.8  Firm Capacity/Energy Sale or Exchange Service shall be
               interruptible only if the interruption is: (a) within the recall
               time or allowed by other applicable provisions governing
               interruptions of service under this Service Schedule mutually
               agreed to by the Seller and the Purchaser, (b) due to an
               Uncontrollable Force as provided in Section 10 of this Agreement;
               or (c) where applicable, to meet Seller's public utility or
               statutory obligations to its customers. If service under this
               Service Schedule is interrupted under Section C-3.8(a) or (b),
               neither Seller nor Purchaser shall be obligated to pay any
               damages under this Agreement or Confirmation Agreement. If
               service under this Service Schedule is interrupted for any reason

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.
<PAGE>   99
Western Systems Power Pool                               Original Sheet No. 89A
Rate Schedule FERC No. 6

               other than pursuant to Section C-3.8(a) or (b), the
               Non-Performing Party shall be responsible for payment of damages
               as provided in Section 21.3 of this Agreement or in any
               Confirmation.

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   100

Western Systems Power Pool                          First Revised Sheet No. 90
Rate Schedule FERC No. 6                     Superseding Original Sheet No. 90

        C-3.9  Each Party that is a FERC regulated public utility as defined in
               Section C-3.6 shall file the Confirmation Agreement with FERC for
               each transaction under this Service Schedule with a term in
               excess of one year no later than 30 days after service begins if
               that Party would have been required to file such Confirmation
               Agreements or similar agreements with FERC under an applicable
               FERC accepted market based rate schedule.

        C-3.10 Seller shall be responsible for ensuring that Service Schedule C
               transactions are scheduled as firm power consistent with the most
               recent rules adopted by the applicable NERC regional reliability
               council.

Issued by: Michael E. Small, General Counsel to      Effective: February 1, 2001
           Western Systems Power Pool
Issued on: December 1, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued September 15, 2000.

<PAGE>   101
Western Systems Power Pool                               Original Sheet No. 91
Rate Schedule FERC No. 6

                                 LIST OF MEMBERS
<TABLE>
<CAPTION>

<S>                                                    <C>
ACN Power, Inc.                                        CMS Marketing, Services and Trading Co.
Amerada Hess Corporation                               CNG Power Services Corp.
Ameren Energy Marketing Company                        Coastal Merchant Energy, L.P.
American Electric Power Service Corporation            Colorado Springs Utilities
as agent for Ohio Power Company, Public Service
Company of Oklahoma and Southwestern Electric
Power Company
APS Energy Services Company, Inc.                      Colton, City of
Aquila Energy Marketing Corporation                    Columbia Energy Power Marketing
Arizona Electric Power Co.                             Columbia Power Corporation
Arizona Public Service Co.                             ConAgra Energy Services, Inc.
Arkansas Electric Coop. Corp.                          Conectiv Energy Supply, Inc.
Associated Electric Cooperative, Inc.                  Conoco Gas & Power Marketing
Astra Oil Company, Inc.                                Constellation Power Source
Avista Corporation                                     Cook Inlet Energy Supply
Avista Energy, Inc.                                    Coral Power, L.L.C.
Basin Electric Power Cooperative                       Deseret G&T
Benton Public Utility District No. 1 of Benton         DTE Energy Trading, Inc.
County
Blackhills Power & Light Company                       Duke Energy Trading & Marketing, LLC
Bonneville Power Adm.                                  Duke/Louis Dreyfuss, LLC
BP Energy Company                                      Dynegy Power Marketing, Inc.
Burbank, City of                                       Dynegy Power Services, Inc.
Calif. Dept. of Water Resources                        E prime
California Polar Power Brokers, LLC                    Edison Mission Marketing & Trading, Inc.
Calpine Energy Services, L.P.                          Edison Source
Candela Energy Corporation                             Edmonton Power Authority, Alberta
Cargill-Alliant, LLC                                   El Paso Electric
Carolina Power & Light Company                         El Paso Merchant Energy, L.P.
Cinergy Capital & Trading, Inc.                        Empire District Electric Co.
Cinergy Operating Companies                            Energy Transfer Group, LLC
City of Anaheim, Public Utilities Dept.                EnerZ Corporation
City of Glendale Water & Power Dept.                   Engelhard Power Marketing, Inc.
City of Independence                                   ENMAX Energy Corporation
City of Riverside, California                          Enron Power Marketing, Inc.
City of Santa Clara Electric Department                Enserco Energy Inc.
City of Sikeston, Board of Municipal Utilities         Entergy Electric System
City Utilities of Springfield, Missouri                Entergy Power Marketing Corp.
City Water & Light (Jonesboro, AR)                     Entergy Power, Inc.
Cleco Marketing & Trading LLC                          Equitable Power Services Co.
Cleco Utility Group Inc.                               Eugene Water & Electric Board
</TABLE>

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: November 17, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued November 2, 2000.

<PAGE>   102
Western Systems Power Pool                               Original Sheet No. 92
Rate Schedule FERC No. 6

<TABLE>
<CAPTION>
<S>                                                    <C>
Farmington, City of                                    Missouri Joint Municipal Electric Utility
                                                       Comm.
Federal Energy Sales, Inc.                             Mock Energy Services, L.P.
FPL Energy Power Marketing Inc.                        Modesto Irrigation District
Golden Spread Electric Cooperative                     Morgan Stanley Capital Group, Inc.
Grand River Dam Authority                              M-S-R Public Power Agency
Hafslund Energy Trading, LLC                           Municipal Energy Agency of Mississippi
Hetch-Hetchy Water & Power                             Municipal Energy Agency of Nebraska
Howard Energy Co., Inc.                                National Gas & Electric L.P.
Idaho Power Company                                    Nebraska Public Power District
IGI Resources, Inc.                                    Nevada Power Co.
Illinova Energy Partners, Inc.                         New West Energy
Imperial Irrigation District                           NewEnergy, Inc.
Industrial Energy Applications, Inc.                   NorAm Energy Services, Inc.
InterCoast Power Marketing                             Northern California Power Agency
J. Aron & Company                                      Northern States Power Company
KAMO Electric Cooperative, Inc.                        NP Energy Inc.
Kansas City Board of Public Utilities                  NRG Power Marketing Inc.
Kansas City Power & Light                              OGE Energy Resources, Inc.
KN Energy Marketing                                    Oklahoma Gas & Electric
Kock Energy Trading, Inc.                              Oklahoma Municipal Power Authority
Lafayette Utilities System                             Omaha Public Power District
LG&E Energy Marketing Inc.                             ONEOK Power Marketing Company
Lincoln Electric System                                Pacific Gas & Electric Co.
Los Alamos County                                      Pacific Northwest Generating Cooperative
Los Angeles Dept. of Water & Power                     PacifiCorp
Louisiana Generating LLC                               PacifiCorp Power Marketing
Louisville Gas & Electric Company                      PanCanadian Energy Services
Mason County PUD No. 3                                 Pasadena, City of
McMinnville Water & Light                              PECO Energy
Merchant Energy Group of the Americas, Inc.            PG&E Energy Services
Merrill Lynch Capital Services, Inc.                   PG&E Energy Trading - Power, L.P.
Metropolitan Water District                            PG&E Power Services Company
MidAmerican Energy Company                             Phibro Inc.
MidCon Power Services Corp.                            Pinnacle West Capital Corporation
MIECO, Inc.                                            Plains Elec. Gen. & Trans. Coop. Inc.
Minnesota Power & Light Company                        Platte River Power Authority
Minnesota Power, Inc.                                  Portland General Electric Co.
</TABLE>

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: November 17, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued November 2, 2000.

<PAGE>   103
Western Systems Power Pool                               Original Sheet No. 93
Rate Schedule FERC No. 6

<TABLE>
<CAPTION>
<S>                                                    <C>
Power Exchange Corporation                             Strategic Energy LLC
Powerex                                                Sunflower Electric Power Corp.
PPL Electric Utilities Corporation                     Tacoma Power
PPL EnergyPlus, LLC                                    Tenaska Power Services Co.
PPL Montana, LLC                                       Tennessee Valley Authority
Public Service Co. of NM                               Texaco Energy Services
Public Service Co. of Colorado                         Texas-New Mexico Power Company
Public Utility District No. 1 of Franklin Cty.         The Energy Authority
PUD No. 1 of Chelan County                             The Montana Power Company
PUD No. 1 of Grays Harbor County                       The Power Company of America, LP
PUD No. 1 of Snohomish County                          Tractebel Energy Marketing, Inc.
PUD No. 2 of Grant County                              TransAlta Energy Marketing (US) Inc.
Puget Sound Energy                                     TransCanada Power
QST Energy Trading Inc.                                Tri-State Generation and Transmission Assoc.
Questar Energy Trading                                 Tucson Electric Power
Rainbow Energy Marketing Corporation                   Turlock Irrigation District
Redding, City of                                       TXU Energy Trading Company
Reliant Energy Services, Inc.                          Union Electric Company
Rocky Mountain Generation Coop., Inc.                  Utah Associated Municipal Power Systems
Sacramento Municipal Utility District                  UtiliCorp United
Salt River Project                                     Vastar Power Marketing, Inc.
San Diego Gas & Electric Co.                           Vernon, City of
SCANA Energy Marketing, Inc.                           Virginia Electric and Power Company
Seattle City Light                                     Vitol Gas & Electric LLC
Sempra Energy Solutions                                West Kootenay Power Ltd.
Sempra Energy Trading Corp.                            Western Adm. Lower Colorado
Sierra Pacific Power Co.                               Western Adm. Sacramento
Sonat Power Marketing LP                               Western Adm. Upper Colorado
Southern California Edison Co.                         Western Adm. Upper Great Plains
Southern California Water Company                      Western Farmers Electric Co-op
Southern Company Energy Marketing L.P.                 Western Power Services, Inc.
Southern Company Services, Inc.                        Western Resources, Inc.
Southern Illinois Power Cooperative                    Williams Energy Marketing & Trading Co.
Southwest Power Administration                         WPS Energy Services, Inc.
Southwestern Public Service
Split Rock Energy LLC
St. Joseph Light & Power Co.
Statoil Energy Trading, Inc.
</TABLE>

Issued by: Michael E. Small, General Counsel to          Effective: July 1, 2000
           Western Systems Power Pool
Issued on: November 17, 2000
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket Nos. ER00-3338, et al., issued November 2, 2000.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}]]