Document:

<PAGE>   1
                                                                   Exhibit 10.11

                       ASSIGNMENT AND ASSUMPTION AGREEMENT
                            (COLSTRIP 3&4 AGREEMENTS)

         THIS ASSIGNMENT AND ASSUMPTION AGREEMENT (COLSTRIP 3&4 AGREEMENTS)
(this "Assignment Agreement") is made and entered into as of the 17th day of
December, 1999, by and between THE MONTANA POWER COMPANY, a Montana corporation,
("MPC"), and PP&L MONTANA, LLC, a Delaware limited liability company ("PP&L
Montana").

                                    RECITALS

         A. MPC, Puget Sound Power & Light Company (now Puget Sound Energy,
Inc.) ("Puget"), Portland General Electric Company ("Portland"), The Washington
Water Power Company (now Avista Corp.) ("Avista") and Pacific Power & Light
Company (now PacifiCorp)("PacifiCorp") are parties to that certain Ownership and
Operation Agreement Colstrip Units #3 and #4 made as of May 6, 1981, as amended
October 11, 1991 and July 13, 1998 ("Colstrip 3&4 Ownership Agreement")
(capitalized terms used in this Assignment Agreement without definition having
the respective meanings specified in the Colstrip 3&4 Ownership Agreement).

         B. MPC, Puget, Portland, Avista, PacifiCorp and Western Energy Company
are parties to that certain Amended and Restated Coal Supply Agreement dated
August 24, 1998 ("Colstrip 3&4 CSA").

         C. MPC, Puget, Portland, Avista, PacifiCorp and Western Energy Company
are parties to that certain coal transportation agreement dated July 10, 1981,
as amended September 14, 1987, and August 24, 1998 ("Colstrip 3&4 CTA").

         D. MPC, Puget, Portland, Avista, PacifiCorp and United States Trust
Company of New York are parties to that certain Agreement Regarding Clean Air
Act Compliance Colstrip Units 3&4, dated November 1, 1994, as amended March 20,
1996 ("Colstrip 3&4 CAA Compliance Agreement").

         E. MPC, Puget, Portland, Avista and PacifiCorp are parties to that
certain Common Facilities Agreement, Colstrip Units #1, #2, #3, and #4, dated
May 6, 1981 as amended January 21, 1992 ("Common Facilities Agreement").

         F. The Colstrip 3&4 Ownership Agreement, Colstrip 3&4 CSA, Colstrip 3&4
CTA, Colstrip 3&4 CAA Compliance Agreement, and the Common Facilities Agreement
(but only insofar as such agreement relates to the portion of the Common
Facilities thereunder allocated to Colstrip Units #3 and #4 as part of the
Project) are collectively referred to herein as the "Assigned Agreements".

         G. MPC and PP&L Global, Inc., a Pennsylvania corporation ("PP&L
Global"), entered into that certain Asset Purchase Agreement dated as of October
31, 1998, as amended June 29, 1999, and October 29, 1999 (as amended, the "Asset
Purchase Agreement"), pursuant to

A&A Agmt (Colstrip 3&4) Execution Copy
<PAGE>   2
which MPC has agreed to sell to PP&L Global, and PP&L Global has agreed to
purchase from MPC, on the terms and subject to the conditions of the Asset
Purchase Agreement, MPC's interest in certain electric generation related
assets, including MPC's Colstrip 3-related interest in the Assigned Agreements
(which interests include a Project Share of 15% and ownership of a 30% undivided
interest in Unit 3, a 15% undivided interest in facilities common to both Unit 3
and Unit 4 (only), and a 15% undivided interest in the Common Facilities).

         H. The Asset Purchase Agreement provides that PP&L Global may assign
its interests in the Asset Purchase Agreement to subsidiaries, and PP&L Global
has formed PP&L Montana, an indirect wholly-owned subsidiary of PP&L Global, for
the purpose of assigning to PP&L Montana certain of PP&L Global's interests in
the Asset Purchase Agreement, including, without limitation, MPC's Colstrip
3-related interests in the Assigned Agreements.

         I. This Assignment Agreement shall not serve to assign (i) MPC's
Colstrip 4-related interests in the Assigned Agreements, (ii) MPC's interest as
Operator (as defined in the Colstrip 3&4 Ownership Agreement) under the Colstrip
3&4 Ownership Agreement; or (iii) MPC's interest as Common Facilities Operator
(as defined in the Common Facilities Agreement) under the Common Facilities
Agreement.

         J. Pursuant to this Assignment Agreement, subject nevertheless to the
Asset Purchase Agreement, PP&L Montana desires to assume and accept from MPC,
and MPC desires to sell, assign and transfer to PP&L Montana, all of MPC's
rights, title, interests, obligations and liabilities in, to and under the
Assigned Agreements which correspond to MPC's Colstrip 3-related interests in
such agreements that arise and are attributable to the period after the Closing
under the Asset Purchase Agreement (as used herein "Closing" has the meaning set
forth in the Asset Purchase Agreement); provided, however, that the parties
recognize and agree there are certain pre-Closing liabilities being assumed by
PP&L Montana as provided in the Asset Purchase Agreement.

         K. All conditions required for assignment of the Assigned Agreements
have been satisfied, including, without limitation, the waivers by Puget,
Portland, Avista and PacifiCorp, of the respective "rights of first refusal" set
forth in such Assigned Agreements.

         L. MPC entered into a sale-leaseback transaction completed in 1985
between MPC and other parties, whereby MPC sold its interest in Colstrip Unit #4
and leased back such interest, pursuant to the agreements listed under subparts
III.A and III.B on the list of Colstrip Contracts attached to the Asset Purchase
Agreement as Disclosure Schedule 1.01(a)(xi) (the "Unit 4 Sale and Leaseback
Transaction Documents"), and the assignment of MPC's Colstrip 3-related
interests in the Assigned Agreements will be subject to the Unit 4 Sale and
Leaseback Transaction Documents insofar as such documents apply to interests in
both Unit 3 and Unit 4.

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
set forth herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

                                      -2-

A&A Agmt (Colstrip 3&4) Execution Copy
<PAGE>   3
                                    AGREEMENT

         SECTION 1.  EFFECTIVE DATE

         This Assignment Agreement shall become effective upon the execution and
delivery of this Assignment Agreement by both parties at the Closing (the
"Effective Date").

         SECTION 2.  ASSIGNMENT AND ASSUMPTION

         (a) As of the Effective Date, MPC hereby transfers, assigns and
delegates to PP&L Montana, and PP&L Montana hereby accepts and assumes from MPC,
subject to the terms and provisions of this Assignment Agreement, the Asset
Purchase Agreement, and the applicable terms and provisions of the Unit 4 Sale
and Leaseback Transaction Documents (but only insofar as such documents apply to
interests in both Unit 3 and Unit 4), all of MPC's rights, title, interests,
obligations and liabilities in, to and under the Assigned Agreements (including,
but without limitation, a Project Share of 15%) which correspond to MPC's
Colstrip 3-related interests under such agreements that arise and are
attributable to the period after the Effective Date; provided that for purposes
of clarification, (a) PP&L Montana shall not assume any obligations or
liabilities of MPC under the Assigned Agreements that arise or are attributable
to the period on and prior to the Effective Date, and (b) MPC shall remain
liable only for such obligations and liabilities of MPC under the Assigned
Agreements that arise or are attributable to the period on and prior to the
Effective Date. Notwithstanding the foregoing, the parties recognize and agree
there are certain pre-Closing liabilities being assumed by PP&L Montana as
provided in the Asset Purchase Agreement.

         (b) This Assignment Agreement shall not operate to assign (i) MPC's
Colstrip 4-related interests in the Assigned Agreements, (ii) MPC's interest as
Operator (as defined in the Colstrip 3&4 Ownership Agreement) under the Colstrip
3&4 Ownership Agreement; or (iii) MPC's interest as Common Facilities Operator
(as defined in the Common Facilities Agreement) under the Common Facilities
Agreement.

         (c) This Assignment Agreement is delivered pursuant to and is subject
to the Asset Purchase Agreement, and shall not be construed to add to or
subtract from the parties' respective rights and responsibilities under the
Asset Purchase Agreement. In the event of any conflict between the terms of the
Asset Purchase Agreement and the terms of this Assignment Agreement, the terms
of the Asset Purchase Agreement shall prevail.

         SECTION 3.  MISCELLANEOUS

         (a) Headings to the sections of this Assignment Agreement are solely
for the convenience of the parties, are not part of this Assignment Agreement,
and shall not be used for the interpretation of, or determination of the
validity of, this Assignment Agreement or any of its provisions.

                                      -3-

A&A Agmt (Colstrip 3&4) Execution Copy
<PAGE>   4
         (b) No Person (as defined in the Asset Purchase Agreement) other than
the parties to this Assignment Agreement, or such parties' successors and
assigns, shall have any rights under this Assignment Agreement or the provisions
contained herein.

         (c) This Assignment Agreement may be executed in any number of
counterparts, each of which will be deemed an original, but all of which
together will constitute one and the same instrument.

         (d) This Assignment Agreement is binding upon, inures to the benefit
of, and is enforceable by the parties hereto and their respective successors and
assigns. Neither this Assignment Agreement nor any right, interest or obligation
hereunder may be assigned by any party hereto without the prior written consent
of the other party hereto, and any attempt to do so shall be void.

         (e) This Assignment Agreement shall be governed by and construed in
accordance with the laws of the State of New York applicable to contracts
executed and performed in such State without giving effect to the conflicts of
laws principles thereof, except that if it is necessary in any other
jurisdiction to have the law of such other jurisdiction govern this Assignment
Agreement in order for this Assignment Agreement to be effective in any respect,
then the law of such other jurisdiction shall govern this Assignment Agreement
to such extent.

                                      -4-

A&A Agmt (Colstrip 3&4) Execution Copy
<PAGE>   5
         IN WITNESS WHEREOF, the parties have caused this Assignment and
Assumption Agreement (Colstrip 3&4 Agreements) to be executed as of the date
first above written.

                                                    PP&L Montana, LLC

                                By:      /s/ Roger Petersen
                                         ---------------------------------------
                                                           Signature

                                         Roger Petersen
                                         ---------------------------------------
                                                           Printed Name

                                         President
                                         ---------------------------------------
                                                           Title

                                         12/17/99
                                         ---------------------------------------
                                                           Date

                                              THE MONTANA POWER COMPANY

                                By:      /s/ Perry J. Cole
                                         ---------------------------------------
                                                           Signature

                                         Perry J. Cole
                                         ---------------------------------------
                                                           Printed Name

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

                                         12/17/99
                                         ---------------------------------------
                                                           Date

                                      -5-

A&A Agmt (Colstrip 3&4) Execution Copy<PAGE>   1
                                                                   Exhibit 10.12

                                                                  EXECUTION COPY

                    PROJECT COMMITTEE VOTE SHARING AGREEMENT

                  This PROJECT COMMITTEE VOTE SHARING AGREEMENT (this
"Agreement") is entered into as of December 17, 1999 (the "Effective Date") by
and between The Montana Power Company, a Montana corporation ("MPC" or a
"Party"), and PP&L Montana, LLC, a Delaware limited liability company ("PP&L
Montana" or a "Party").

                                R E C I T A L S:

                  A. The ownership, operation and maintenance of the Project is
governed by that certain Ownership and Operation Agreement, dated as of May 6,
1981 and amended on October 11, 1991 and July 13, 1998, by and between MPC,
Puget Sound Energy, Inc. (formerly named "Puget Sound Power & Light Company"), a
Washington corporation, Avista Corporation (formerly named "Washington Water
Power Company"), a Washington corporation, Portland General Electric Company, an
Oregon corporation, and PacifiCorp (successor by merger to the Maine corporation
named "Pacific Power & Light Company"), an Oregon corporation (as amended,
modified and supplemented from time to time, the "Ownership Agreement").

                  B. Pursuant to that certain Asset Purchase Agreement, dated as
of October 31, 1998, by and among MPC and PP&L Global, Inc., a Delaware
corporation ("PP&L") (as amended, modified and supplemented from time to time,
the "Asset Purchase Agreement"), MPC has agreed to sell and PP&L has agreed to
purchase and accept through its affiliate, PP&L Montana, all of MPC's right,
title and interest in Colstrip 3 and a 15% Project Share (referred to herein,
even after such purchase and sale by PP&L Montana, as "MPC's Colstrip 3 Project
Share"). PP&L Montana also will become the Operator of the Project. MPC is
retaining all of its right, title and interest in Colstrip 4 and a 15% Project
Share ("MPC's Colstrip 4 Project Share").

                  C. Pursuant to Section 17(a) of the Ownership Agreement, (i)
MPC and its successors and assigns (including PP&L Montana) acting collectively
shall appoint one (1) Committee member and (ii) such shared member shall vote as
a unit MPC's Colstrip 3 Project Share and MPC's Colstrip 4 Project Share (the
"Shared Vote"). The Parties desire to enter into this Agreement to establish the
terms and conditions for the joint appointment of such shared member to the
Project Committee and the taking of action (including casting the Shared Vote)
by such member.

                  D. MPC's Colstrip 4 Project Share is subject to (i) the
Participation Agreement dated as of December 16, 1985 (including all exhibits to
same as actually executed by the parties thereto), by and among United States
Trust Company of New York, a New York corporation ("USTC"), Louis P. Young, an
individual ("Young" and, together
<PAGE>   2
with USTC, "Owner Trustee" or "Lessor"), MPC, Bankers Trust Company (the
"Indenture Trustee"), Mellon Leasing Corporation (the "Owner Participant" as
assignee and successor to Burnham Leasing Corporation, the original Owner
Participant)) and the Loan Participants identified therein and (ii) the
Participation Agreement, dated as of December 16, 1985 (including all exhibits
to same as actually executed by the parties thereto), by and among the Owner
Trustee, MPC, the Indenture Trustee, SGE (New York) Associates (the "Owner
Participant") and the Loan Participant identified therein (items (i) and (ii)
collectively, together with all exhibits thereto, as separately executed, and as
amended, modified and supplemented from time to time, the "Colstrip 4 Leveraged
Lease Documents").

                  NOW, THEREFORE, in consideration of the foregoing premises,
and for other consideration the sufficiency and receipt of which is hereby
acknowledged, the Parties agree as follows:

                                    AGREEMENT

                                   ARTICLE I

                          DEFINITIONS & INTERPRETATION

         Section 1.1 Definitions. In this Agreement, the following capitalized
terms have the meanings assigned below.

                  (a) "Appointee" means any of a Chairman Appointee, an MPC
Appointee or a PP&L Appointee.

                  (b) "Authorized Officer" means, with respect to a Party, any
officer of such Party.

                  (c) "Cause" means a finding by an arbitrator that PP&L Montana
is in material breach of its obligations as Operator. Any such arbitration shall
be conducted pursuant to Section 18 of the Ownership Agreement.

                  (d) "Chairman Appointee" has the meaning assigned in Section
2.1(b).

                  (e) "Classification Objection" means an Objection on the
grounds that the other Party has incorrectly classified the subject matter of
the Proposal.

                  (f) "Colstrip 3" means such portion of the Project commonly
known as "Colstrip Unit 3" and the corresponding interest in the facilities the
use of which is common to Units 3 and 4 (only), the Common Facilities and
related facilities, real property and property rights.

                  (g) "Colstrip 3 Proposal" means a Proposal that relates solely
to Colstrip 3.

                                       2
<PAGE>   3
                  (h) "Colstrip 4" means such portion of the Project commonly
known as "Colstrip Unit 4" and the corresponding interest in the facilities the
use of which is common to Units 3 and 4 (only), the Common Facilities and
related facilities, real property and property rights.

                  (i) "Colstrip 4 Proposal" means a Proposal that relates solely
to Colstrip 4.

                  (j) "Disapproval Statement" means the written statement
submitted to the other members of the Project Committee pursuant to Section
17(h) of the Ownership Agreement.

                  (k) "Lease Default Objection" means an Objection on the
grounds that the manner in which the Shared Vote is intended to be cast can
reasonably be expected to result in a Lease Default or Lease Event of Default
(each as defined in the Colstrip 4 Leveraged Lease Documents).

                  (l) "Mixed Proposal" means a Proposal that is not a Colstrip 3
Proposal or a Colstrip 4 Proposal.

                  (m) "MPC Appointee" has the meaning assigned in Section
2.1(c).

                  (n) "Objection" means an objection by a Party (or such Party's
Appointee) to the manner in which the Other Party's Appointee intends to use the
Shared Vote. Only the following Objections may be asserted under this Agreement:
Classification Objections, Lease Default Objections or Prudency Objections.

                  (o) "Party Appointee" means either an MPC Appointee or a PP&L
Appointee.

                  (p) "Poll" has the meaning assigned in Section 3.2(b).

                  (q) "PP&L Appointee" has the meaning assigned in Section
2.1(c).

                  (r) "Proposal" means any proposal being considered for action
by the Project Committee. The subject matters of the Proposals are in one (only)
of three classes: Colstrip 3 Proposals, Colstrip 4 Proposals and Mixed
Proposals.

                  (s) "Prudency Objection" means an objection resulting from a
good faith determination by an Authorized Officer of such Party that approval of
the matter in question would be inconsistent with Prudent Generator Practice
(such determination to be made on the assumption that such Party is a long-term
owner (and not merely a lessee) of MPC's Colstrip 3 Project Share or MPC's
Colstrip 4 Project Share, as appropriate).

                  (t) "Prudent Generator Practice" shall mean, at a particular
time, any of those practices, methods, standards or acts engaged in or approved
by a significant portion (which need not be a majority) of independent power
producers at such time with respect to large fossil-generating facilities
similar to the Project and owned or held under long-term lease by such
independent power producers. Prudent Generator Practice is not intended to be
limited to the

                                       3
<PAGE>   4
optimum practice, method or act to the exclusion of all others, but rather is a
spectrum of possible practices, methods, standards or acts having due regard
for, among other things, manufacturers' warranties, engineering and operating
considerations, equipment used and requirements of governmental authorities and
the requirements of the Project Agreements.

         Section 1.2 Other Capitalization. Unless otherwise defined in this
Agreement (including the Recitals), all other capitalized terms used in this
Agreement have the meanings assigned to such terms in the Ownership Agreement.

         Section 1.3 Interpretation. Unless the context of this Agreement
otherwise requires, (a) words of any gender include each other gender; (b) words
using the singular or plural number also include the plural or singular number,
respectively; (c) the terms "hereof," "herein," "hereby" and derivative or
similar words refer to this entire Agreement; (d) the terms "Article" or
"Section" refer to the specified Article or Section of this Agreement; and (e)
any reference to the entirety or any part of any agreement or document shall
refer to any amendment, supplement or replacement of the same. Whenever this
Agreement refers to a number of days, such number shall refer to calendar days
unless business days are specified.

                                   ARTICLE II

                  APPOINTEES; GENERAL COVENANTS OF THE PARTIES

         Section 2.1 Appointment Processes.

                  (a) Unless otherwise agreed in writing by PP&L Montana and
MPC, each Appointee appointed pursuant to this Agreement shall (i) have
sufficient financial and/or operational experience with electric energy plants
similar to the Project, (ii) be an individual who is an employee of one of the
Parties to this Agreement, and (iii) serve in accordance with the applicable
terms and provisions of this Agreement and the Ownership Agreement.

                  (b) Subject to Section 17(c) of the Ownership Agreement,
during any period in which PP&L Montana (which for purposes of this Section
2.1(b) does not include any of PP&L Montana's successors or assigns) is the
Operator, PP&L Montana shall have the sole right and power to appoint the
Chairman of the Project Committee (the "Chairman Appointee"). The Chairman
Appointee, as such, shall not have the power to vote regarding any portion of
the Shared Vote.

                  (c) PP&L Montana shall appoint the individual and alternates
(the "PP&L Appointee") who shall be entitled to use the Shared Vote on PP&L
Montana's behalf under this Agreement and MPC shall appoint the individual and
alternates who shall be entitled to use the Shared Vote on MPC's behalf under
this Agreement (the "MPC Appointee").

                  (d) Notice of any appointment made pursuant to this Section
2.1 shall be delivered in writing not later than one business day prior to the
effective date of such

                                       4
<PAGE>   5
appointment. Nothing in this Section 2.1 is intended to limit the Parties'
ability to agree in writing to alter the selection process for any Appointee.

         Section 2.2 Appointee Obligations. During his or her term each
Appointee shall serve in good faith and act in accordance with this Agreement,
and the Chairman Appointee shall promptly provide each Party Appointee with
copies of all documents sent to members of the Project Committee regarding the
Project. If an Appointee breaches any of its material obligations under this
Agreement, such Appointee shall be removed by the appointing Party promptly
after receipt of written notice from the non-appointing Party, which notice
shall describe the breach. A replacement Appointee shall be selected in the
manner of selecting the Appointee set forth in Section 2.1.

         Section 2.3 General Acknowledgments and Agreements.  The Parties hereby
make the following acknowledgements and agreements:

                  (a) Wherever either Party's approval, consent or agreement is
         required under this Agreement, it is understood that such approval,
         consent or agreement shall not be unreasonably withheld, delayed or
         conditioned unless this Agreement specifically provides that a
         different standard should apply; provided that waivers shall not be
         bound by this Section 2.3(a).

                  (b) Neither Party shall cause a Party Appointee to vote to
         take or omit to take any action that would be likely to have the direct
         or indirect effect of (i) conferring a benefit on Colstrip 3 without
         also conferring a proportionate benefit on Colstrip 4 or (ii) imposing
         a burden on Colstrip 4 without proportionately burdening Colstrip 3.

                  (c) The Parties shall maintain in confidence the
         communications, discussions and deliberations with the Appointees and
         between the Parties regarding the advice to, consultation with, and the
         establishment of strategy and casting of votes with respect to the
         Shared Vote; provided that (i) the obligation set forth herein shall
         not be construed to prohibit disclosure to a Party's employees,
         shareholders, directors, officers, advisors, agents, representatives or
         lenders and (ii) the Parties may mutually agree to disclose some or all
         of the communications, discussions or deliberations addressed hereby.
         Nothing in this Section 2.3(c) shall constitute a waiver of, or
         agreement not to assert, any attorney-client, work product, or other
         privilege unless otherwise available with respect to a Party, its
         Appointees (and, in the case of PP&L Montana, the Chairman Appointee)
         and their separate deliberations and consultations.

                  (d) The Parties shall cooperate with one another in good faith
         regarding the advice of and consultation with the Appointees, the
         correct subject matter classification of Proposals hereunder and the
         establishment of strategy and casting of votes with respect to MPC's
         Colstrip 3 Project Share and MPC's Colstrip 4 Project Share. If any
         Proposal can reasonably be expected to adversely affect either Party's
         rights or obligations under this Agreement, then the Parties shall
         consult in good faith and attempt to agree on a course of action to
         take with respect to the Proposal. This covenant

                                       5
<PAGE>   6
         to cooperate includes, without limitation, the obligation to provide
         the other Party with notice of any conflict or disagreement as soon as
         reasonably practicable.

                  (e) Nothing contained herein shall prohibit an Appointee from
         advancing any argument or taking any position at a Project Committee
         meeting inconsistent with the official vote being cast by the Shared
         Vote, and the Parties shall not interfere with an Appointee's efforts
         to communicate with the Project Committee on any matter properly before
         the Project Committee.

                  (f) Until PP&L Montana shall no longer be the Operator, the
         Party Appointees selected pursuant to this Agreement, when casting the
         Shared Vote, shall be considered the Operator's Committee member under
         the Ownership Agreement (particularly Section 17 thereof).

                  (g) MPC's Colstrip 4 Project Share is subject to the terms and
         provisions of the Colstrip 4 Leveraged Lease Documents and the Parties
         acknowledge that pursuant to Section 24.1(b) of the Lease (as defined
         in each of the Colstrip 4 Leveraged Lease Documents), the lessors
         thereunder may, in certain instances, direct voting of the Shared Vote
         if a Lease Default or Lease Event of Default has occurred and is
         continuing.

                  (h) This Agreement does not apply to rights, votes, approvals,
         consents, waivers or the like that are to be made or exercised directly
         by Owners or Project Users under the Ownership Agreement (as opposed to
         rights, votes, approvals, consents, waivers or the like designed to be
         made or exercised by the members of Project Committee or the Project
         Committee as a whole). The Party Appointees shall not have the power to
         bind the Parties beyond their ability to cast the Shared Vote
         hereunder; it being understood that Appointees may waive Objections but
         do not, in capacities as such, have the power to waive any other rights
         under this Agreement.

                  (i) With respect to Proposals that it may make in it its role
         as Operator, PP&L Montana agrees that it shall promptly consult with
         MPC in advance and in good faith regarding any Proposal to be
         considered for action by the Project Committee.

                  (j) The Appointees have the full authority to act on behalf of
         the Party that designated such Appointee; the action of an Appointee at
         a Project Committee meeting (or through a written consent) shall bind
         the Party and hold such Party responsible for all liabilities and
         obligations arising out of such action (whether intentional,
         unintentional or derivative) and the other Party shall be entitled to
         rely on such action without further inquiry or investigation as to the
         actual authority (or lack thereof) of such Appointee.

         Section 2.4 Rights of Protected Persons. Each Appointee (collectively,
the "Protected Persons") may rely and shall be protected in acting and
refraining from action upon any

                                       6
<PAGE>   7
instruction from the Party appointing such Protected Person. Each Protected
Person may consult with counsel (who may be internal counsel to the Party
appointing such Protected Person) and any advice of such counsel shall be full
and complete authorization and protection in respect of any action taken,
suffered or omitted to be taken by such Protected Person hereunder in good faith
and believed by such Protected Person to be authorized or within his or her
discretion, rights or powers conferred upon him or her by this Agreement.
Furthermore, each Party agrees that its exclusive remedy for a breach of this
Agreement shall be an action against the other Party in the manner permitted by
this Agreement.

                                  ARTICLE III

                               THE VOTING PROCESS

         Section 3.1 Voting Rights and Objections Generally.

                  (a) The Shared Vote shall be cast strictly in accordance with
this Agreement and furthermore shall be cast by one of the Party Appointees
depending on the subject matter of each Proposal. Objections shall be
communicated as soon as possible but in any event prior to the casting of an
official vote by the Project Committee as follows: (i) the Objection shall be
communicated verbally by telephone or in person to the other Party Appointee for
any Proposal received on the day of the Project Committee meeting in which such
Proposal is to be considered and (ii) the Objection shall be communicated in
writing delivered via facsimile or in person and verbally by telephone or in
person to the other Party Appointee for any Proposal received prior to the day
of the Project Committee meeting in which such Proposal is to be considered.
Subject to Section 3.1(c), the types of Objections which may be raised and the
manner in which the Shared Vote may be cast are set forth on the chart below. If
a Party Appointee is absent from a Project Committee meeting and appropriate
alternate arrangements consistent with the Ownership Agreement have not been
made (except for such absences due to an emergency or similar circumstances
beyond such Appointee's control), the other Party may cast the Shared Vote.

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
                   VOTING RIGHTS IF NO
SUBJECT MATTER     OBJECTION IS RAISED    PERMITTED OBJECTIONS    DEFAULT RESOLUTION AFTER AN OBJECTION IS RAISED
---------------------------------------------------------------------------------------------------------------------
<S>                <C>                    <C>                    <C>
Colstrip 3         PP&L Appointee casts   Classification         If a Classification Objection:  The Proposal shall
Proposal           the Shared Vote.       Objection or Lease     be re-classified as a Colstrip 4 Proposal or a
                                          Default Objection.     Mixed Proposal pursuant to MPC's instructions and
                                                                 the Shared Vote shall be cast by the Party
                                                                 entitled thereto, unless PP&L Montana contests the
                                                                 Classification Objection under Article IV.

                                                                 If a Lease Default Objection:  MPC Appointee casts
                                                                 the Shared Vote unless PP&L Montana contests the
                                                                 Lease Default Objection under Article IV.
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                                        7
<PAGE>   8
<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
                   VOTING RIGHTS IF NO
SUBJECT MATTER     OBJECTION IS RAISED    PERMITTED OBJECTIONS    DEFAULT RESOLUTION AFTER AN OBJECTION IS RAISED
---------------------------------------------------------------------------------------------------------------------
<S>                <C>                    <C>                    <C>
Colstrip 4         MPC Appointee casts    Classification         The Proposal shall be re-classified as a Colstrip
Proposal           the Shared Vote.       Objection.             3 Proposal or a Mixed Proposal pursuant to PP&L
                                                                 Montana's instructions and the Shared Vote shall
                                                                 be cast by the Party entitled thereto, unless MPC
                                                                 contests the Classification Objection under
                                                                 Article IV.
---------------------------------------------------------------------------------------------------------------------
Mixed Proposal     PP&L Appointee casts   Classification         If a Classification Objection:  The Proposal shall
                   the Shared Vote.       Objection, Lease       be re-classified as a Colstrip 3 Proposal or a
                                          Default Objection or   Colstrip 4 Proposal pursuant to MPC's instructions
                                          Prudency Objection.    and the Shared Vote shall be cast by the Party
                                                                 entitled thereto, unless PP&L Montana contests the
                                                                 Classification Objection under Article IV.

                                                                 If a Lease Default Objection:  MPC Appointee casts
                                                                 the Shared Vote unless PP&L Montana contests the
                                                                 Lease Default Objection under Article IV.

                                                                 If a Prudency Objection:  MPC Appointee casts the
                                                                 Shared Vote unless a valid Poll overrules the
                                                                 Objection under Section 3.2.  So long as a Poll
                                                                 may be conducted, Article IV does not apply to
                                                                 Prudency Objections.
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                  (b) If, despite the good faith efforts of both Parties
(including, without limitation, attempts by the Chairman Appointee, PP&L Montana
in its capacity as the Operator, the MPC Appointee and the PP&L Appointee to
delay the Project Committee vote and to hasten the dispute resolution process)
the Project Committee vote occurs prior to resolution of the validity of an
Objection pursuant to Article IV, the Shared Vote shall not be cast.

                  (c) If PP&L Montana (which, for purposes of this Section
3.1(c), does not include any of PP&L's successors or assigns) shall not be
entitled to participate in the selection or direction of the Chairman Appointee
or the PP&L Appointee under the terms and provisions of any financing documents
that encumber any of PP&L Montana's interest in the Shared Vote (except for the
Colstrip 4 Leveraged Lease Documents), Proposals shall be voted in accordance
with the provisions and chart set forth in Section 3.1(a) except that Mixed
Proposals shall be voted in accordance with the following chart:

                                       8
<PAGE>   9
<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------

                   VOTING RIGHTS IF NO
SUBJECT MATTER     OBJECTION IS RAISED    PERMITTED OBJECTIONS   DEFAULT RESOLUTION AFTER AN OBJECTION IS RAISED
---------------------------------------------------------------------------------------------------------------------
<S>                <C>                    <C>                    <C>
Mixed Proposal     MPC Appointee casts    Classification         If a Classification Objection:  The Proposal shall
                   the Shared Vote.       Objection or Prudency  be re-classified as a Colstrip 3 Proposal or a
                                          Objection.             Colstrip 4 Proposal pursuant to PP&L Montana's
                                                                 instructions and the Shared Vote shall be cast by
                                                                 the Party entitled thereto, unless MPC contests
                                                                 the Classification Objection under Article IV.

                                                                 If a Prudency Objection:  PP&L Montana casts the
                                                                 Shared Vote unless a valid Poll overrules the
                                                                 Objection under Section 3.2.  So long as a Poll
                                                                 may be conducted, Article IV does not apply to
                                                                 Prudency Objections.
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                  (d) Notwithstanding any other provision of this Agreement, the
Parties agree that, from the effectiveness of PP&L Montana's appointment as
Operator through the tenth anniversary date of such effectiveness, the Shared
Vote shall not be used in a manner to remove or substitute PP&L Montana as
Operator other than for Cause.

         Section 3.2 The Conduct and Results of a Prudency Objection Poll.

                  (a) If a Party asserts a Prudency Objection, the non-objecting
Party shall request that the Project Committee conduct a Poll regarding such
Proposal as follows: (i) if the Prudency Objection is asserted on the day of or
during the Project Committee meeting in which the Proposal is to be considered,
the non-objecting Party shall request during the Project Committee meeting that
a Poll be conducted during such meeting and (ii) if the Prudency Objection is
asserted prior to the day of the Project Committee meeting in which the Proposal
is to be considered, the non-objecting Party shall give notice both
telephonically and by facsimile to the objecting Party that it will request that
a Poll be taken at the Project Committee meeting.

                  (b) A valid "Poll" is one in which the requisite Project
Committee members (including the Appointees selected pursuant to this Agreement)
together representing sufficient Project Shares to meet the minimum percentage
voting requirements under the Ownership Agreement present their good faith
indication of how they intend to vote on the Proposal being considered. For
purposes of conducting the Poll, (i) the Project Shares of MPC and PP&L Montana
shall be separately tallied for purposes of the Poll and not counted as a single
combined Shared Vote and (ii) for so long as PP&L Montana (which for purposes of
this clause (ii) does not include any of PP&L Montana's successors or assigns)
is the Operator, the PP&L Appointee (who shall be casting a Poll vote on behalf
of MPC's Colstrip 3 Project Share) shall be deemed the "Operator's member" under
the Ownership Agreement. Therefore, the results of a valid Poll shall present a
pure tally of the Project Users' positions with respect to a Proposal based on
each Project User's actual Project Share.

                                       9
<PAGE>   10
                  (c) The official Shared Vote shall be cast to dispose of the
Proposal in a manner reflected by the Poll in light of the minimum percentage
voting requirements under the Ownership Agreement. The fact that a Project
Committee member casts an official vote that differs from its Poll vote shall
have no bearing on the official Shared Vote cast in accordance with this Section
3.2(c). The Shared Vote cast may be changed only upon the concurrence of both
Party Appointees and in accordance with the terms and provisions of the
Ownership Agreement.

                  (d) Where, through the successful exercise of an Objection, a
Party has cast the Shared Vote to reject a Proposal, such Party shall have the
sole right and responsibility to submit a Disapproval Statement, and the other
Party shall have no right to submit a Disapproval Statement representing the
Shared Vote relating to such rejected proposal. If in accordance with Section
3.1(b) the Shared Vote was not cast, the Parties shall attempt to submit a
Disapproval Statement that contains both Parties' positions on, and alternatives
with respect to, the Proposal. In all other situations, the Parties shall
cooperate in good faith to prepare and submit Disapproval Statements on behalf
of the Shared Vote that present positions and alternative proposals that are
agreeable to both Parties; it being the express preference of this Agreement
that a Disapproval Statement actually be submitted within the time periods
required under the Ownership Agreement.

                                   ARTICLE IV

                               DISPUTE RESOLUTION

         Section 4.1 Resolution of Disputes. All disputes between the Parties
shall be resolved in accordance with this Article IV; provided that although a
Party's assertion of an Objection shall not be considered a dispute subject to
this Article IV, the other Party may contest the validity of an Objection
(except for Prudency Objections, contests of which shall be resolved exclusively
pursuant to Section 3.2) asserted hereunder. The Parties agree to make a
diligent, good faith attempt to resolve all disputes before demanding
arbitration hereunder. Such good faith attempt shall include a meeting between
representatives of both Parties that are authorized to resolve the dispute,
which meeting shall occur no later than two (2) business days after receipt by
the intended Party of written notice of the dispute hereunder. The Parties
acknowledge that time is of the essence in resolving all disputes under this
Agreement.

         Section 4.2 Binding Arbitration.

                  (a) If the dispute remains unresolved for two (2) business
days following the meeting described in Section 4.1, then either Party may
request the commencement of binding arbitration to resolve such dispute by
delivering written notice to the other Party. Subject to this Article IV, the
arbitration shall be conducted in accordance with the Commercial Arbitration
Rules of the American Arbitration Association then in effect.

                  (b) No later than five (5) business days before the
arbitration, each Party shall submit to the arbitrator such Party's proposed
resolution of the dispute in writing, and the

                                       10
<PAGE>   11
arbitrator shall be limited to selecting only one of the two proposed
resolutions. No arbitration shall last longer than one (1) business day and the
arbitrator shall be required to issue his or her final decision no later than
two (2) business days prior to the Project Committee meeting of which the
underlying Proposal will be considered. The arbitrator shall not have the power
to award any other damages, grant any other relief or vary the provisions of
this Agreement, and any decision or other order rendered by the arbitrator in
contravention of this Agreement shall be invalid and constitute grounds for
demanding a new arbitration.

                  (c) Each Party shall pay its own costs associated with the
arbitration, but the Parties shall share the costs of the arbitration proceeding
equally.

                  (d) Evidence concerning details of any settlement negotiations
prior to arbitration shall not be permitted. The Parties further undertake to
carry out without delay the provisions of any arbitral decision, and each agrees
that any such decision may be enforced by any competent tribunal.

                  (e) Unless otherwise agreed in writing, MPC and PP&L Montana
shall continue to perform their respective obligations hereunder during the
pendency of any proceeding by the Parties in accordance with this Article IV.

                                   ARTICLE V

                               TERM & TERMINATION

     Section 5.1 Term. This Agreement shall become effective as of the date
first written above and, subject to periodic suspension pursuant to Section 5.2,
shall continue in full force and effect until (a) the effective date of an
amendment to the Ownership Agreement that permits MPC's Colstrip 4 Project Share
to be voted separately and independently from MPC's Colstrip 3 Project Share or
(b) the occurrence of the Lessor Possession Date (under any of the Colstrip 4
Leveraged Lease Documents).

         Section 5.2 Suspension. This Agreement shall be suspended automatically
for any period during which the lessors under the Colstrip 4 Leveraged Lease
Documents have exercised their rights pursuant to Section 24.1(b) of the Lease
(as defined thereunder); provided that (i) the Chairman Appointee's obligation
to deliver copies of documents as described in Section 2.2 (with the
understanding that during the suspension period, the term "Chairman Appointee"
is intended to describe the chairman of the Project Committee so long as such
Person has been appointed by PP&L Montana or MPC) and Article VII shall continue
in full force and effect during such suspension period and (ii) the remaining
provisions of this Agreement shall continue in full force and effect as such
provisions relate to performance by the Parties under this Agreement prior to
the commencement of such suspension period.

                                       11
<PAGE>   12
                                   ARTICLE VI

                         REPRESENTATIONS AND WARRANTIES

                  Each Party represents and warrants to the other Party that, as
of the Effective Date:

                           (a) such Party is duly formed and validly existing
         under the laws of the jurisdiction of its organization and is duly
         authorized to do business in each other jurisdiction in which it is
         required to be so qualified with full power and authority to perform
         its obligations hereunder and that the execution, delivery and
         performance of this Agreement has been duly authorized by such Party;

                           (b) this Agreement has been duly executed and
         delivered by such Party and constitutes the legal, valid, binding and
         enforceable obligation of such Party enforceable in accordance with its
         terms against such Party subject to the effect of bankruptcy,
         insolvency, moratorium and other similar laws relating to creditors'
         rights generally, whether existing at law or in equity, by general
         equitable principles and by an implied covenant of good faith and fair
         dealing;

                           (c) no consent, approval or authorization of, or
         filing, registration or qualification with, any court or governmental
         authority on the part of such Party is required for the execution and
         delivery of this Agreement by such Party and the performance of its
         obligations and duties hereunder, other than those that have been made
         or obtained;

                           (d) such Party is in material compliance with all
         laws and legal requirements applicable to its business; and

                           (e) such Party holds a fifteen percent (15%) Project
         Share in the Project.

                                  ARTICLE VII

                                  MISCELLANEOUS

         Section 7.1 Assignment; Third Party Beneficiaries. A transfer or
assignment by either Party of any part of its interest under this Agreement to
any other Person (an "Assignee") shall be subject to the non-assigning Party's
receipt of written evidence that each of the following conditions has been
satisfied: (a) the assigning Party shall be simultaneously transferring or
assigning a corresponding portion of its Project Share to such Assignee, (b)
such Assignee shall have assumed in writing the corresponding duties and
obligations of the assigning Party which arise and are attributable to the
period after the effective date of the assignment and (c) if a partial (but not
a full) assignment of this Agreement is being effected, arrangements regarding
the casting of the Shared Vote acceptable to the non-assigning Party shall be
agreed upon in writing

                                       12
<PAGE>   13
(including, without limitation, by amending this Agreement). Except as
explicitly provided herein, nothing in this Agreement, express or implied, is
intended to confer on any person or entity other than the Parties and their
successors and assigns permitted hereunder any rights, remedies, obligations or
liabilities under or by reason of this Agreement.

         Section 7.2 Specific Performance. The Parties hereby declare that it is
impossible to measure in money the damages that will accrue to a Party hereto by
reason of a failure to perform any of the obligations under this Agreement and
agree that the terms of this Agreement shall be specifically enforceable. If any
Party hereto institutes any action or proceeding to specifically enforce the
provisions hereof, the Party against whom such action or proceeding is brought
hereby waives the claim or defense therein that such Party has an adequate
remedy at law, and such Party shall not offer in any such action or proceeding
the claim or defense that such remedy at law exists.

         Section 7.3 Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF MONTANA WITHOUT REGARD TO
CONFLICTS OF LAWS PRINCIPLES.

         Section 7.4 Severability. Any provision of this Agreement that is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions of this Agreement, and any such
prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

         Section 7.5 Notices and Communications.

                  (a) Unless otherwise specified herein, all notices under this
Agreement shall be in writing and shall be (i) delivered personally; (ii) sent
by a recognized overnight mail or courier service, with delivery receipt
requested; or (iii) sent by facsimile transmission, followed by written
confirmation, to the Parties at the addresses, telephone and facsimile numbers
set forth on the signature pages hereto.

                  (b) All notices sent under this Agreement shall be effective
when received by the other Party, except that any facsimile which is received
after 5:00 p.m. at the location of the receiving Party shall be deemed to be
effective on the next business day.

                  (c) Each Party may change its notice information set forth
above by prior written notice to the other Party pursuant to this Section 7.5.

         Section 7.6 Amendments and Waivers. This Agreement may be amended,
supplemented or otherwise modified only by a writing executed and delivered by
each Party. No waiver of any right under this Agreement shall be binding unless
such waiver is in a writing by the Party to be bound. No failure to exercise and
no delay in exercising, on the part of any Party, any right, remedy, power or
privilege under this Agreement, shall operate as a waiver thereof; nor shall any
single or partial exercise of any right, remedy, power or privilege under this

                                       13
<PAGE>   14
Agreement preclude any other or further exercise thereof or the exercise of any
other right, remedy, power or privilege.

         Section 7.7 Further Assurances; Cooperation in Seeking Amendment.

                  (a) Each of the Parties agrees to perform all such acts
(including executing and delivering such instruments and documents) as
reasonably may be requested by the other Party to fully effect the intent and
each and all of the purposes of this Agreement.

                  (b) The Parties agree to cooperate and use commercially
reasonable efforts to seek an amendment of the Ownership Agreement that will
permit MPC's Colstrip 4 Project Share to be voted separately and independently
from MPC's Colstrip 3 Project Share.

         Section 7.8 Conflicts. In the event of a conflict between the Asset
Purchase Agreement, on the one hand, and this Agreement, on the other hand, the
terms and provisions of this Agreement shall govern.

         Section 7.9 Headings. The article and section headings contained in
this Agreement are for reference purposes only and shall not affect in any way
the meaning or interpretation of this Agreement.

         Section 7.10 Survival. The representations and warranties set forth in
Article VI shall survive the Effective Date.

         Section 7.11 Counterparts. This Agreement may be executed in any number
of counterparts, each of which shall be considered an original, but all of which
together shall constitute a single instrument.

         Section 7.12 Contract Only, etc. This Agreement creates a contractual
relationship between the Parties and does not give rise to any fiduciary,
quasi-fiduciary, partnership or other special relationship which would result in
the implication of rights, duties or standards of care or performance other than
such rights, duties and standards as would attend a contract between
sophisticated commercial parties each represented by separate counsel. Except as
expressly set forth herein, nothing in this Agreement is intended to limit or
abridge PP&L Montana's rights, interests, responsibilities and liabilities as
Operator.

                               [SIGNATURES FOLLOW]

                                       14
<PAGE>   15
                  IN WITNESS WHEREOF, each of the Parties has executed this
Project Committee Vote Sharing Agreement as of the Effective Date.

                                   THE MONTANA POWER COMPANY

                                   By:             /s/ Richard F. Cromer
                                        ----------------------------------------
                                        Name: Richard F. Cromer
                                              ----------------------------------
                                        Title: Executive Vice President
                                               ---------------------------------

                                   Addresses for Notices:

                                   The Montana Power Company
                                   Energy Supply Division
                                   40 E. Broadway
                                   Butte, MT  59701
                                   Attention: Executive Vice President and
                                              Chief Operating Officer
                                   Telephone: (406) 496-5100
                                   Facsimile  (406) 497-2150

                                   With a copy of written notices to:

                                   The Montana Power Company
                                   40 E. Broadway
                                   Butte, MT  59701
                                   Attention: General Counsel
                                   Facsimile: (406) 497-2451

                                   PP&L MONTANA, LLC

                                   By:             /s/ Roger Petersen
                                        ----------------------------------------
                                        Name: Roger Petersen
                                              ----------------------------------
                                        Title:     President
                                               ---------------------------------

                                   Address for Notices:

                                   PP&L Montana, LLC
                                   US Bank Building
                                   303 North Broadway, Suite 400
                                   Billings, MT 59101
                                   Attention: David Kinnard, General Counsel
                                   Telephone: (406) 869-5100
                                   Facsimile: (406) 869-5149

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