MONTANA POWER CO /MT/
PREM14A, 2000-12-27
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
                                  SCHEDULE 14A
                                 (RULE 14A-101)
                    INFORMATION REQUIRED IN PROXY STATEMENT
                            SCHEDULE 14A INFORMATION

                  Proxy Statement Pursuant to Section 14(a) of
                      the Securities Exchange Act of 1934

<TABLE>
      <S>        <C>
      Filed by the Registrant /X/
      Filed by a Party other than the Registrant / /

      Check the appropriate box:
      /X/        Preliminary Proxy Statement
      / /        Definitive Proxy Statement
      / /        Definitive Additional Materials
      / /        Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
      / /        Confidential, for Use of the Commission Only (as permitted by Rule
                 14a-6(e)(2))

                   THE MONTANA POWER COMPANY
      ----------------------------------------------------------------------------------
                       (Name of Registrant as Specified In Its Charter)

                                 N/A
      ----------------------------------------------------------------------------------
           (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
</TABLE>

Payment of Filing Fee (Check the appropriate box):

/ /  No fee required.
/X/  Fee computed on table below per Exchange Act Rules 14a-6(i)(1)
     and 0-11.
     (1) Title of each class of securities to which transaction applies:
         Common Stock, par value $0.01 and Preferred Stock, par value $0.01 of
         The Montana Power Company.
         -----------------------------------------------------------------------
     (2) Aggregate number of securities to which transaction applies:
         108,384,000 shares of The Montana Power Company common stock and
         580,389 shares of The Montana Power Company preferred stock.
         -----------------------------------------------------------------------
     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
         filing fee is calculated and state how it was determined):
         The filing fee was determined based upon the sum of (a) the product of
         108,384,000 shares of The Montana Power Company common stock and
         $20.47; (b) the product of 360,800 shares of The Montana Power Company
         Preferred Stock, $6.875 Series and $93.875; (c) the product of 159,589
         shares of The Montana Power Company Preferred Stock, $6.00 Series and
         $79.25; and (d) the product of 60,000 shares of The Montana Power
         Company Preferred Stock, $4.20 Series and $58.8125. In accordance with
         Rule 0-11 under the Securities Exchange Act of 1934, as amended, the
         filing fee was determined by multiplying the amount calculated pursuant
         to the preceding sentence by 1/50 of one percent.
         -----------------------------------------------------------------------
<PAGE>
     (4) Proposed maximum aggregate value of transaction:
         $2,268,666,758.25
         -----------------------------------------------------------------------

     (5) Total fee paid:
         $453,733.35
         -----------------------------------------------------------------------
/ /  Fee paid previously with preliminary materials.
/ /  Check box if any part of the fee is offset as provided by Exchange Act
     Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
     paid previously. Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.
     (1) Amount Previously Paid:
         -----------------------------------------------------------------------
     (2) Form, Schedule or Registration Statement No.:
         -----------------------------------------------------------------------
     (3) Filing Party:
         -----------------------------------------------------------------------
     (4) Date Filed:
         -----------------------------------------------------------------------
<PAGE>
[LOGO]                                                                    [LOGO]

                                                            [            ], 2001

              RESTRUCTURING PROPOSED--YOUR VOTE IS VERY IMPORTANT

Dear Shareholders:

    The Board of Directors of The Montana Power Company announced in March 2000
that it would begin the process of divesting The Montana Power Company's
multiple energy businesses in order to focus on its telecommunications business,
Touch America, Inc. The goal of the Board was to rapidly exit the energy
businesses and, through a restructuring, transform The Montana Power Company
into a telecommunications company. The decision to divest the energy businesses
was based on a belief that the divestiture would allow a focus on the
fast-growing telecommunications business of Touch America, Inc., while enabling
the energy businesses to grow and add value under new ownership, for the benefit
of The Montana Power Company's stockholders, customers and communities.

    Following this announcement, The Montana Power Company successfully entered
into agreements to divest itself of all the energy businesses, and is now ready
to ask for your vote to complete the restructuring. The Board has approved a
merger that will create a new company, Touch America Holdings, Inc., to own what
is today the telecommunications business of The Montana Power Company.
Immediately following this merger, the remaining energy business of The Montana
Power Company, its utility business, will be sold to NorthWestern Corporation.
Upon completion of this merger and the sale of the utility business to
NorthWestern, Touch America Holdings will own Touch America, Inc. and
Tetragenics Company, which will be its telecommunications operating business.
The Board of The Montana Power Company believes that the merger and sale of the
utility business to NorthWestern is necessary in order to maximize value for its
shareholders.

    Upon completion of the merger, shareholders of The Montana Power Company
will be deemed to receive one share of Touch America Holdings' common stock for
each common share of The Montana Power Company, and one share of Touch America
Holdings' Preferred Stock, $6.875 Series for each share of The Montana Power
Company's outstanding Preferred Stock, $6.875 Series.

    The Montana Power Company will hold a special meeting of our shareholders to
consider and vote on the merger and the sale of the utility business to
NorthWestern. In addition, shareholders of common stock will be asked to vote in
favor of the redemption of The Montana Power Company's outstanding Preferred
Stock, $4.20 Series and Preferred Stock, $6.00 Series. Whether or not you plan
to attend the special meeting, please take the time to vote by following the
instructions on your proxy card.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of The Montana
Power Company's Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series
will be deemed to receive in the merger one share of Touch America Holdings'
Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series, for each
outstanding share of The Montana Power Company's Preferred Stock $4.20 Series
and Preferred Stock $6.00 Series, respectively.

    Separately, and independent of the merger and this special meeting, the
Board has determined it would be in the best interest of The Montana Power
Company and its shareholders to initiate a tender offer for the Preferred Stock,
$6.875 Series of The Montana Power Company. We are not asking for you to take
any action on this matter at the current time.
<PAGE>
    The place, date and time of the special meeting is as follows:

                            The Mother Lode Theatre
                                  316 W. Park
                                 Butte, Montana
                     [      ], 2001, 1:30 p.m., local time

    I ENTHUSIASTICALLY SUPPORT THE RESTRUCTURING AND JOIN WITH THE MONTANA POWER
COMPANY'S BOARD IN RECOMMENDING THAT YOU VOTE FOR THE APPROVAL OF THE MERGER
AGREEMENT, THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN AND THE REDEMPTION
OF THE PREFERRED STOCK.

------------------------

Sincerely,
/s/ Robert P. Gannon
Robert Gannon
Chairman and Chief Executive Officer
The Montana Power Company

    FOR A DISCUSSION OF CERTAIN FACTORS WHICH YOU SHOULD CONSIDER IN EVALUATING
THE RESTRUCTURING, SEE "CERTAIN FACTORS RELATING TO THE RESTRUCTURING" BEGINNING
ON PAGE 16.

    Up to 108,384,000 shares of Touch America Holdings' common stock, par value
$.01 per share, and up to 580,389 shares of Touch America Holdings' Preferred
Stock, par value $.01 per share, may be issued in connection with the merger.
The Touch America Holdings' common stock will be listed on the New York Stock
Exchange and the Pacific Exchange, Inc. Touch America Holdings' common stock
will trade under the ticker symbol "TAA".

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
proxy statement/prospectus is truthful or complete. Any representation to the
contrary is a criminal offense.

    THIS PROXY STATEMENT/PROSPECTUS IS DATED [            ], 2001, AND IS FIRST
BEING MAILED TO SHAREHOLDERS ON OR ABOUT [            ], 2001.

                                       2
<PAGE>
                                     [LOGO]

                             THE MONTANA POWER COMPANY

                                ----------------

                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                      TO BE HELD ON [             ], 2001

                            ------------------------

To the Shareholders of The Montana Power Company:

    It is our pleasure to invite you to a special meeting of the shareholders of
The Montana Power Company on [      ], [            ], 2001, at 1:30 p.m., local
time, at the Mother Lode Theatre, 316 W. Park, Butte, Montana, for the following
purpose:

    To consider and vote upon three separate but related proposals:

    PROPOSAL ONE: Approval of the agreement and plan of merger among The Montana
    Power Company, Touch America Holdings, Inc., a Delaware corporation and
    wholly owned subsidiary of The Montana Power Company, and The Montana Power
    L.L.C., a Montana limited liability company and wholly owned subsidiary of
    Touch America Holdings, dated as of [      ], 2000, the result of which is
    that holders of common shares of The Montana Power Company will be deemed to
    receive one share of Touch America Holdings' common stock for each share of
    common stock of The Montana Power Company and the holders of shares of
    Preferred Stock, $6.875 Series of The Montana Power Company will be deemed
    to receive one share of Touch America Holdings' Preferred Stock, $6.875
    Series for each share of Preferred Stock, $6.875 Series of The Montana Power
    Company.

    PROPOSAL TWO: Approval of the sale of substantially all of the assets of The
    Montana Power Company relating to its utility business as contemplated by
    the Unit Purchase Agreement between NorthWestern Corporation, The Montana
    Power Company and Touch America Holdings, Inc. dated as of September 29,
    2000.

    PROPOSAL THREE: Approval of the redemption of The Montana Power Company's
    outstanding Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series.

    Approval of the merger agreement is contingent upon the approval of the sale
of the utility business to NorthWestern. The Montana Power Company, Touch
America Holdings and The Montana Power L.L.C. will not complete the merger
unless The Montana Power Company's shareholders approve the sale of the utility
business to NorthWestern. We cannot complete the merger and the sale of the
utility business to NorthWestern unless holders of at least two-thirds of all
the shares outstanding and entitled to vote at the special meeting vote to
approve the merger agreement and the sale of the utility business to
NorthWestern.

    Approval of the redemption of the preferred stock is not contingent upon the
approval of the sale of the utility business to NorthWestern or the merger
agreement. We cannot complete the redemption of the preferred stock unless
holders of a least a majority of all of our common shares outstanding and
entitled to vote at the special meeting vote to approve and adopt the redemption
of the preferred stock.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of The Montana
Power Company's Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series
will be deemed to receive in the merger one share of Touch America Holdings'
Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series, for each
outstanding share of The Montana Power Company's Preferred Stock $4.20 Series
and Preferred Stock $6.00 Series, respectively. The terms of the Touch America
Preferred Stock, $4.20 Series and Preferred Stock, $6.00
<PAGE>
Series will be identical to the terms of the Montana Power Company Preferred
Stock, $4.20 Series and Preferred Stock, $6.00 Series, respectively.

    Shareholders who owned either our common or preferred stock on
[            ], are entitled to vote on the merger agreement and the sale of the
utility business to NorthWestern at the special meeting. Shareholders who owned
our common stock on [      ], are entitled to vote on the redemption of the
preferred stock.

    The members of the Board present at the relevant meetings have unanimously
adopted and approved the sale of the utility business to NorthWestern, the
merger agreement and the redemption of the preferred stock and unanimously
recommended that our shareholders vote for each of these proposals.

    We will transact no other business at the special meeting, except for
business properly brought before the special meeting or any adjournment or
postponement of it by the Board.

    The accompanying proxy is solicited by the Board of Directors of The Montana
Power Company, a Montana corporation, for use at the special meeting on
[      ], 2001, or at any adjournment thereof.

    The accompanying proxy statement was mailed on or about [            ].
These materials are also available on our home page (www.mtpower.com).

    FOR MORE INFORMATION ABOUT THE RESTRUCTURING DESCRIBED ABOVE AND THE RELATED
TRANSACTIONS, PLEASE REVIEW THE ACCOMPANYING PROXY STATEMENT/PROSPECTUS, THE
MERGER AGREEMENT ATTACHED TO IT AS ANNEX A, AND THE UNIT PURCHASE AGREEMENT
ATTACHED TO IT AS ANNEX B.

    WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, PLEASE COMPLETE, SIGN
AND DATE THE ENCLOSED PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED POSTAGE-PAID
ENVELOPE. WE ARE ALSO OFFERING YOU THE CHANCE TO CAST YOUR VOTE BY TELEPHONE OR
COMPUTER. YOU MAY VOTE BY TELEPHONE OR COMPUTER BY FOLLOWING THE INSTRUCTIONS ON
YOUR PROXY CARD.

    PLEASE DO NOT SEND ANY SHARE CERTIFICATES AT THIS TIME. YOU WILL NOT BE
REQUIRED TO EXCHANGE YOUR SHARE CERTIFICATES AS A RESULT OF THE MERGER. IN THE
MERGER, YOUR EXISTING SHARE CERTIFICATES OF THE MONTANA POWER COMPANY WILL
AUTOMATICALLY BECOME SHARE CERTIFICATES OF TOUCH AMERICA HOLDINGS, INC.

                                          By Order of the Board of Directors,
                                          /s/ Patrick T. Fleming
                                          Corporate Secretary

Butte, Montana
[      ], 2001
<PAGE>
                      REFERENCES TO ADDITIONAL INFORMATION

    This proxy statement/prospectus incorporates important business and
financial information about The Montana Power Company (hereinafter referred to
as "MPC") and Touch America Holdings, Inc. from other documents that are not
included in or delivered with this proxy statement/prospectus. This information
is available to you without charge upon your written or oral request. You can
obtain those documents incorporated by reference in this proxy
statement/prospectus by requesting them in writing or by telephone from MPC at
the following address:

                           THE MONTANA POWER COMPANY
                  C/O CORPORATE INVESTOR COMMUNICATIONS, INC.
                               111 COMMERCE ROAD
                              CARLSTADT, NJ 07072

                         INDIVIDUAL SHAREHOLDERS SHOULD
                                     CALL:
                                 1-800-793-1283

                         BANKS AND BROKERS SHOULD CALL:
                                 (201) 896-2633

    IF YOU WOULD LIKE TO REQUEST DOCUMENTS, PLEASE DO SO BY [      ], 2001, IN
ORDER TO RECEIVE THEM BEFORE YOUR SPECIAL MEETING.

    See "Where You Can Find More Information" below on page 79.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
QUESTIONS AND ANSWERS ABOUT THE RESTRUCTURING...............       1

SUMMARY.....................................................       4
  General...................................................       4
  The Restructuring.........................................       6
  The Companies.............................................      10

CERTAIN FACTORS RELATING TO THE RESTRUCTURING...............      16

SELECTED HISTORICAL CONDENSED CONSOLIDATED FINANCIAL DATA OF
  MPC.......................................................      26

SELECTED UNAUDITED PRO FORMA CONDENSED CONSOLIDATED
  FINANCIAL DATA OF TOUCH AMERICA HOLDINGS..................      27

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS...........      28

THE SPECIAL MEETING.........................................      29
  Date, Time and Place......................................      29
  Purpose of the Special Meeting............................      29
  Record Date; Shares Entitled to Vote; Quorum..............      29
  Vote Required.............................................      29
  Voting by MPC Directors and Executive Officers............      30
  Voting of Proxies.........................................      30
  Revocability of Proxies...................................      31
  Solicitation of Proxies...................................      31

THE RESTRUCTURING...........................................      32
  General Description of the Restructuring..................      32
  Background of the Restructuring...........................      32
  Reasons for the Restructuring and the MPC Board
    Recommendation..........................................      34
  Use of Proceeds from the Sale of the Energy Businesses....      36
  Interests of MPC's Directors and Management in the
    Restructuring...........................................      36
  Outstanding Stock Based Grants Under MPC's Long-Term
    Incentive Plan..........................................      37
  Change of Control Agreements..............................      37
  Employee Benefit Plans....................................      38
  Indemnification...........................................      40
  Listing of Touch America Holdings' Capital Stock..........      40
  Dividends.................................................      40
  Material U.S. Federal Income Tax Consequences of the
    Merger..................................................      40
  Accounting Treatment......................................      42
  Dissenters' or Appraisal Rights...........................      42
  Resale of Touch America Holdings' Common Stock............      44

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS; DIRECTORS;
  AND EXECUTIVE OFFICERS....................................      45
  Security Ownership of Certain Beneficial Owners of MPC....      45
  Security Ownership of Management of MPC...................      45

REGULATORY MATTERS..........................................      47
  General...................................................      47
  State Approvals or Filings................................      47
  Federal Energy Regulatory Commission......................      47
  United States Antitrust Law...............................      48
</TABLE>

                                       i
<PAGE>

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
THE MERGER AGREEMENT........................................      49
  The Merger Between MPC and The Montana Power L.L.C........      49
  Timing....................................................      49
  Merger Consideration......................................      49
  Conditions to the Completion of the Merger................      49
  Termination of the Merger Agreement.......................      49

THE PURCHASE AGREEMENT......................................      50
  The Sale of the Utility Business to NorthWestern..........      50
  Timing of Closing.........................................      50
  Consideration.............................................      50
  Conditions to the Completion of the Sale of the Utility
    Business to NorthWestern................................      50
  No Solicitation by MPC and Touch America Holdings.........      51
  Termination of the Purchase Agreement.....................      53
  Termination Fees; Reimbursement of Expenses...............      53
  Interim Operations of MPC.................................      54
  Indemnification...........................................      57
  Amendment; Extension and Waiver...........................      57
  Representations and Warranties............................      58

THE REDEMPTION OF THE PREFERRED STOCK.......................      58

UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS OF
  TOUCH AMERICA HOLDINGS....................................      59

DESCRIPTION OF TOUCH AMERICA HOLDINGS' CAPITAL STOCK........      68
  General...................................................      68
  Common Stock..............................................      68
  Preferred Stock...........................................      68

COMPARISON OF SHAREHOLDER RIGHTS............................      71
  Corporate Governance......................................      71
  Authorized Capital Stock..................................      71
  Number of Directors.......................................      71
  Classified Board..........................................      72
  Cumulative Voting.........................................      72
  Vacancies on the Board....................................      72
  Removal of Directors......................................      73
  Vote Required for Shareholder Actions.....................      74
  Shareholder Action By Written Consent.....................      74
  Special Meetings of Shareholders..........................      74
  Amendments to Governing Documents.........................      75
  Preemptive Rights.........................................      76
  Indemnification of Directors, Officers, Employees and
    Agents..................................................      76
  Limitation on Director Liability..........................      76
  Business Combinations.....................................      77
  Dissenters' or Appraisal Rights...........................      77
  Anti-takeover Statutes....................................      78
  Shareholder Rights Plan...................................      78

LEGAL MATTERS...............................................      78

EXPERTS.....................................................      78

SHAREHOLDER PROPOSALS.......................................      79
</TABLE>

                                       ii
<PAGE>

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
OTHER MATTERS...............................................      79

WHERE YOU CAN FIND MORE INFORMATION.........................      79

INDEX TO FINANCIAL STATEMENTS...............................     F-1
</TABLE>

<TABLE>
<CAPTION>
       ANNEXES
---------------------
<S>                     <C>
Annex A                 Agreement and Plan of Merger

Annex B                 Unit Purchase Agreement

Annex C                 Montana Business Corporation Act Sections 35-1-826 through
                          35-1-839
</TABLE>

                                      iii
<PAGE>
                 QUESTIONS AND ANSWERS ABOUT THE RESTRUCTURING

Q: WHEN AND WHERE IS THE SHAREHOLDERS MEETING?

A: The special shareholders meeting will take place on [            ], [      ],
    2001 at The Mother Lode Theatre, 316 W. Park, Butte, Montana.

Q: WHAT WILL HAPPEN IN THE RESTRUCTURING?

A: The restructuring is comprised of three steps: (1) the redemption of
    preferred stock, (2) the merger and (3) the sale of the utility business to
    NorthWestern. First, prior to the merger, MPC will redeem the outstanding
    Preferred Stock, $4.20 Series and Preferred Stock, $6.00 Series. Second, MPC
    will merge with and into The Montana Power L.L.C., with The Montana Power
    L.L.C. surviving the merger. As a result of this merger, Touch America
    Holdings will become the owner of the telecommunications business and the
    utility business of MPC, and shareholders of MPC will become stockholders of
    Touch America Holdings. Finally, immediately following the merger, Touch
    America Holdings will sell The Montana Power L.L.C., representing the
    utility business, to NorthWestern Corporation. As a result of this
    restructuring, Touch America Holdings will be the owner of Touch
    America, Inc. and Tetragenics Company, its telecommunications operating
    businesses.

Q: WHAT WILL I RECEIVE FOR MY SHARES?

A: As a result of the merger, each common shareholder of MPC will be deemed to
    receive one share of Touch America Holdings' common stock for each MPC
    common share that he or she holds and each MPC preferred shareholder will be
    deemed to receive one share of Touch America Holdings' Preferred Stock,
    $6.875 Series for each MPC Preferred Stock, $6.875 Series that he or she
    holds. See "Description of Touch America Holdings' Capital Stock" below on
    page 68.

    If the redemption of the preferred stock is not approved by at least a
    majority of all common shares outstanding and entitled to vote at the
    special meeting, each shareholder of Preferred Stock, $4.20 Series and
    Preferred Stock, $6.00 Series will be deemed to receive in the merger one
    share of Touch America Holdings' Preferred Stock, $4.20 Series and Preferred
    Stock, $6.00 Series, for each outstanding share of Preferred Stock $4.20
    Series and Preferred Stock $6.00 Series, respectively. The terms of the
    Touch America Holdings' Preferred Stock, $4.20 Series and Preferred Stock,
    $6.00 Series will be identical to the terms of the Preferred Stock, $4.20
    Series and Preferred Stock, $6.00 Series, respectively. See "The Redemption
    of the Preferred Stock" below on page 58.

Q: WHAT HAPPENS TO MY FUTURE DIVIDENDS?

A: On October 24, 2000, the MPC Board voted to eliminate common dividend
    payments effective the first quarter of 2001. The final quarterly dividend
    declared by MPC was $.20 per share payable on November 1, 2000. However,
    preferred dividends of MPC will not be affected by this decision.

    Following the restructuring and for the foreseeable future, Touch America
    Holdings does not expect to pay dividends on its common stock.

Q: WHAT ARE MY FEDERAL TAX CONSEQUENCES AS A RESULT OF THE MERGER?

A: The merger should be tax-free to MPC's shareholders for U.S. federal income
    tax purposes.

Q: WHAT DO I NEED TO DO NOW?

A: After carefully reading and considering the information contained in this
    proxy statement/prospectus, please complete and sign your proxy and return
    it in the enclosed postage-paid envelope as soon as possible so that your
    shares may be represented at the special meeting. You also have the option
    to

                                       1
<PAGE>
    vote by telephone or computer. If voting by telephone or computer, dial the
    toll-free number or access the Internet address indicated on your proxy. You
    will be prompted to enter the control number printed on your proxy and to
    follow the subsequent simple directions that will be provided. You may also
    vote in person at the special meeting. However, if your broker holds your
    shares and you intend to come to the meeting and vote, you must bring a
    letter from your broker identifying you as the beneficial owner of the
    shares and authorizing you to vote. See "The Special Meeting--Voting of
    Proxies" below on page 30.

    If you sign, date and send your proxy and do not indicate how you want to
    vote, we will count your proxy as a vote for the approval of the proposals.
    See "The Special Meeting--Voting of Proxies" below on page 30.

Q: WHAT DO I DO IF I WANT TO CHANGE MY VOTE?

A: Send a later-dated, signed proxy card to MPC's Secretary, submit a later vote
    by telephone or computer as described above, or attend the special meeting
    in person and vote. You may also revoke your proxy card by sending a notice
    of revocation to MPC's Secretary at the address under "The Summary--The
    Companies" below on page 10. You may change your vote by using any one of
    these methods regardless of the procedure used to cast your previous vote.
    See "The Special Meeting--Revocability of Proxies" below on page 31.

Q: IF MY BROKER HOLDS MY SHARES IN "STREET NAME," WILL MY BROKER VOTE MY SHARES?

A: If you do not provide your broker with instructions on how to vote your
    "street name" shares, your broker will not be permitted to vote them on the
    merger proposal, the sale of the utility business to NorthWestern proposal
    or the redemption proposal. You should therefore be sure to provide your
    broker with instructions on how to vote your shares. You should check the
    voting form used by your brokers to see if they offer telephone or computer
    voting.

    If you do not give voting instructions to your broker, you will not be
    counted as voting for purposes of the merger vote, the sale of the utility
    business to NorthWestern vote nor the redemption of the preferred stock vote
    unless you appear and vote in person at the special meeting. If your broker
    holds your shares and you intend to come to the meeting and vote, you must
    bring a letter from your broker identifying you as the beneficial owner of
    the shares and authorizing you to vote. See "The Special Meeting--Voting of
    Proxies" below on page 30.

Q: WHAT WILL HAPPEN IF I ABSTAIN FROM VOTING OR FAIL TO VOTE?

A: An abstention or failure to vote will have the same effect as a vote against
    all the proposals. See "The Special Meeting--Voting of Proxies" below on
    page 30.

Q: SHOULD I SEND IN MY SHARE CERTIFICATES NOW?

A: No. If the merger is completed, you will not be required to exchange your MPC
    share certificates as a result of the merger. In the merger, your existing
    MPC share certificates will automatically become share certificates of Touch
    America Holdings.

Q: WHAT VOTE IS REQUIRED TO APPROVE AND ADOPT THE RESTRUCTURING?

A: The affirmative vote of at least two-thirds of the shares outstanding and
    entitled to vote as of the record date (  ) is required to approve the
    merger agreement and the sale of the utility business to NorthWestern.

    The affirmative vote of at least a majority of the common shares outstanding
    and entitled to vote as of the record date (  ) is required to approve the
    redemption of the Preferred Stock, $4.20 Series and the Preferred Stock,
    $6.00 Series. See "The Special Meeting--Vote Required" below on page 29.

                                       2
<PAGE>
Q: WHO ELSE MUST APPROVE THE RESTRUCTURING?

A: In connection with the sale of the utility business to NorthWestern, in
    addition to the approval of MPC's shareholders, the purchase agreement
    requires that MPC obtain the approval of state and federal regulatory
    agencies before the sale of the utility business to NorthWestern can be
    completed. See "Regulatory Matters" below on page 47.

    In connection with the merger, in addition to the approval of MPC
    shareholders, the merger agreement requires that Touch America Holdings list
    its common stock on the New York Stock Exchange and the Pacific
    Exchange, Inc. and receive a ruling from the IRS with respect to tax
    consequences of the merger. In addition, federal regulatory approval will be
    necessary in connection with the merger. See "Regulatory Matters" below on
    page 47.

    The redemption does not require any approvals in addition to the approval of
    MPC's common shareholders.

Q: WHEN IS THE RESTRUCTURING EXPECTED TO BE COMPLETED?

A: We are working as quickly as possible and expect to complete the
    restructuring within 6 months from the date of this proxy
    statement/prospectus.

Q: DO I HAVE DISSENTERS' OR APPRAISAL RIGHTS?

A: Yes. Holders of MPC's shares will have dissenters' rights under Montana law
    as a result of the merger. See "The Restructuring--Dissenters' or Appraisal
    Rights" below on page 42.

Q: WHO CAN HELP ANSWER MY QUESTIONS?

A: If you have any questions about any aspects of the restructuring or if you
    need additional copies of this proxy statement/ prospectus or the enclosed
    proxy card, you should contact:

                  CIC Corporate Investor Communications, Inc.
                               111 Commerce Road
                              Carlstadt, NJ 07072

                      Individual shareholders should call:
                                 1-800-793-1283

                         Banks and Brokers should call:
                                 (201) 896-2633

Q: WHERE CAN I FIND MORE INFORMATION ABOUT MPC?

A: You can find more information about MPC from various sources described under
    "Where You Can Find More Information" below on page 79.

Q: HOW IMPORTANT IS MY VOTE?

A: SINCE THE MERGER AND THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN CANNOT
    BE CONSUMMATED WITHOUT THE AFFIRMATIVE VOTE OF TWO-THIRDS OF MPC'S
    SHAREHOLDERS, AND THE REDEMPTION OF THE PREFERRED STOCK CANNOT BE
    CONSUMMATED WITHOUT THE AFFIRMATIVE VOTE OF A MAJORITY OF MPC'S COMMON
    SHAREHOLDERS, EVERY SHAREHOLDER VOTE IS IMPORTANT. AN ABSTENTION OR FAILURE
    TO VOTE WILL HAVE THE SAME EFFECT AS A VOTE AGAINST THE MERGER, THE SALE OF
    THE UTILITY BUSINESS TO NORTHWESTERN AND THE REDEMPTION OF THE PREFERRED
    STOCK.

                                       3
<PAGE>
                                    SUMMARY

    THIS SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS PROXY
STATEMENT/PROSPECTUS AND MAY NOT CONTAIN ALL OF THE INFORMATION THAT IS
IMPORTANT TO YOU. TO UNDERSTAND THE RESTRUCTURING FULLY AND FOR A MORE COMPLETE
DESCRIPTION OF THE LEGAL TERMS OF THE RESTRUCTURING, YOU SHOULD READ CAREFULLY
THIS ENTIRE PROXY STATEMENT/PROSPECTUS AND THE OTHER DOCUMENTS TO WHICH WE HAVE
REFERRED YOU. SEE "WHERE YOU CAN FIND MORE INFORMATION" ON PAGE 79. WE HAVE
INCLUDED PAGE REFERENCES PARENTHETICALLY TO DIRECT YOU TO A MORE COMPLETE
DESCRIPTION OF THE TOPICS PRESENTED IN THIS SUMMARY.

                                    GENERAL

WHAT YOU WILL RECEIVE IN THE RESTRUCTURING (PAGE 49)

    In the merger, each common share of MPC will automatically be converted into
one share of Touch America Holdings' common stock and each share of Preferred
Stock, $6.875 Series of MPC will automatically be converted into one share of
Touch America Holdings' Preferred Stock, $6.875 Series.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series will be deemed to receive in the
merger one share of Touch America Holdings' Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, for each outstanding share of Preferred Stock
$4.20 Series and Preferred Stock $6.00 Series, respectively. The terms of the
Touch America Holdings' Preferred Stock, $4.20 Series and Preferred Stock, $6.00
Series will be identical to the terms of the Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, respectively.

    MPC SHAREHOLDERS WILL NOT BE REQUIRED TO EXCHANGE THEIR MPC SHARE
CERTIFICATES AS A RESULT OF THE MERGER. ACCORDINGLY, MPC SHAREHOLDERS SHOULD NOT
SEND IN THEIR MPC SHARE CERTIFICATES.

WHAT WILL BE SOLD IN THE RESTRUCTURING (PAGE 50)

    At the completion of the restructuring, NorthWestern will purchase Touch
America Holdings' single member interest in The Montana Power L.L.C. and, thus,
ownership and control of MPC's regulated electric and natural gas utilities
which represented approximately 42% of MPC's 1999 consolidated revenue
(excluding intersegment revenues) and approximately 43% of MPC's 1999
consolidated net income.

WHAT WILL BE REDEEMED IN THE RESTRUCTURING (PAGE 58)

    MPC will redeem all of its outstanding Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series.

RECOMMENDATIONS BY THE MPC BOARD (PAGE 32)

    At its meetings on September 29, 2000 (regarding the sale of the utility
business to NorthWestern) and October 24, 2000 (regarding the restructuring, the
merger and the redemption of the preferred stock), after due consideration, the
members of the MPC Board present unanimously:

    - determined that the restructuring is consistent with, and in furtherance
      of, the best interest of MPC and its shareholders;

                                       4
<PAGE>
    - determined that the sale of the utility business to NorthWestern and the
      other transactions contemplated by the purchase agreement are consistent
      with, and in furtherance of, the best interest of MPC and its
      shareholders;

    - adopted and approved the purchase agreement and the other transactions
      contemplated by the purchase agreement;

    - determined that the merger is consistent with, and in furtherance of, the
      best interest of MPC and its shareholders;

    - adopted and approved the merger agreement and the other transactions
      contemplated by the merger agreement;

    - determined to recommend that MPC shareholders vote for the approval of the
      merger agreement and the sale of the utility business to NorthWestern;

    - determined that the redemption of the preferred stock is consistent with,
      and in furtherance of, the best interest of MPC and it shareholders; and

    - adopted and approved the redemption and determined to recommend that MPC
      shareholders vote for the approval of the redemption of the preferred
      stock.

WHAT VOTE IS REQUIRED FOR THE RESTRUCTURING (PAGE 29)

    The approval of (i) the merger agreement and (ii) the sale of the utility
business to NorthWestern by the holders of record of MPC shares requires the
affirmative vote of at least two-thirds of the shares outstanding and entitled
to vote at the special meeting of the shareholders as of the record date, either
in person or by proxy, voting as a single class.

    The approval of the redemption of the preferred stock requires the
affirmative vote of at least a majority of the common shares outstanding and
entitled to vote at the special meeting of the shareholders as of the record
date, either in person or by proxy, voting as a single class.

INTERESTS OF MPC'S DIRECTORS AND MANAGEMENT IN THE RESTRUCTURING (PAGE 36)

    At the completion of the restructuring, Touch America Holdings' Board of
Directors will consist of the following individuals: Robert P. Gannon, Jerrold
P. Pederson, Tucker Hart Adams, Alan F. Cain, John G. Connors, R.D. Corette, Kay
Foster, John R. Jester, Carl Lehrkind III, Deborah D. McWhinney and Noble E.
Vosburg. The following officers of MPC and Touch America, Inc. will be officers
of Touch America Holdings: Robert P. Gannon, Jerrold P. Pederson, Michael J.
Meldahl, Patrick T. Fleming, and Rose Marie Ralph. Robert P. Gannon, currently
the Chairman and Chief Executive Officer of MPC, will continue as Chairman and
Chief Executive Officer of Touch America Holdings.

DISSENTERS OR APPRAISAL RIGHTS (PAGE 42)

    As a shareholder, if you follow certain procedures under Montana law, you
may demand "dissenters' rights" and receive fair market value for your MPC
shares in cash. You will receive such cash in lieu of Touch American Holdings'
shares, but only if you deliver notice of intent to exercise such dissenters'
rights to MPC prior to the vote to approve the merger and the sale of the
utility business to NorthWestern and do not vote in favor of the merger proposal
and the sale of the utility business to NorthWestern proposal.

                                       5
<PAGE>
                               THE RESTRUCTURING

THE MERGER BETWEEN MPC AND THE MONTANA POWER L.L.C. (PAGE 49)

    THE MERGER AGREEMENT IS ATTACHED AS ANNEX A TO THIS PROXY
STATEMENT/PROSPECTUS. WE ENCOURAGE YOU TO READ THE MERGER AGREEMENT. IT IS THE
PRINCIPAL DOCUMENT GOVERNING THE MERGER.

    CONDITIONS TO THE COMPLETION OF THE MERGER (PAGE 49)

    The completion of the merger depends upon meeting the following conditions:

    - Federal Energy Regulatory Commission approval for the disposition or
      transfer of control over jurisdictional facilities and for the transfer of
      the Milltown Hydroelectric License from MPC to The Montana Power L.L.C.,

    - approval by MPC's shareholders,

    - MPC receiving a ruling from the IRS or an opinion of outside counsel
      satisfactory to the MPC Board with respect to tax consequences of the
      merger, and

    - the listing of Touch America Holdings' common stock on the New York Stock
      Exchange and the Pacific Exchange, Inc..

    TERMINATION OF THE MERGER AGREEMENT (PAGE 49)

    The merger agreement may be terminated at any time prior to the completion
of the merger:

    - by MPC's shareholders, and

    - by the MPC Board if it should determine that the merger would not be
      advisable or not be in the best interests of MPC or MPC's shareholders.

THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN (PAGE 50)

    THE PURCHASE AGREEMENT IS ATTACHED AS ANNEX B TO THIS PROXY
STATEMENT/PROSPECTUS. WE ENCOURAGE YOU TO READ THE PURCHASE AGREEMENT. IT IS THE
PRINCIPAL DOCUMENT GOVERNING THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN.

    MUTUAL CONDITIONS TO THE COMPLETION OF THE SALE OF THE UTILITY BUSINESS TO
    NORTHWESTERN (PAGE 50)

    The completion of the sale of the utility business to NorthWestern depends
upon meeting a number of conditions, including the following:

    - accuracy as of closing of the representations and warranties made by MPC,
      Touch America Holdings and NorthWestern to the extent set forth in the
      purchase agreement,

    - performance in all material respects of the obligations required to be
      performed by MPC, Touch America Holdings and NorthWestern at or prior to
      the sale of the utility business to NorthWestern,

    - all regulatory approvals necessary to permit Touch America Holdings and
      NorthWestern to consummate the transactions contemplated by the purchase
      agreement being obtained at or prior to the sale of the utility business
      to NorthWestern,

    - receipt of a certificate of an executive officer of Touch America Holdings
      and NorthWestern as to the satisfaction of closing conditions,

                                       6
<PAGE>
    - absence of any legal prohibition on completion of the sale of the utility
      business to NorthWestern, and

    - all third party consents shall have been obtained and be in full force and
      effect.

    ADDITIONAL CLOSING CONDITIONS FOR NORTHWESTERN'S BENEFIT (PAGE 51)

    In addition, NorthWestern's obligation to complete the sale of the utility
business to NorthWestern is subject to, among other things:

    - the completion of the merger,

    - the termination or transfer of certain MPC benefit plans,

    - the resignation of Touch America Holdings as manager of The Montana Power
      L.L.C., and

    - the assignment of certain contracts to The Montana Power L.L.C. or MPC's
      subsidiaries by MPC.

    TERMINATION OF THE PURCHASE AGREEMENT (PAGE 53)

    The purchase agreement may be terminated at any time prior to the completion
of the sale of the utility business to NorthWestern:

    (1) by mutual written agreement of Touch America Holdings, MPC and
       NorthWestern;

    (2) by Touch America Holdings, MPC or NorthWestern if:

       (a) the sale of the utility business to NorthWestern has not been
           completed by March 31, 2002,

       (b) MPC's shareholders do not give the required approvals,

       (c) there is a permanent legal prohibition to the sale of the utility
           business to NorthWestern, or

       (d) there has been a material breach of any representation, warranty or
           covenant which is not cured within 15 days written notice or cannot
           be cured by March 31, 2002;

    (3) by NorthWestern if (i) the MPC Board fails to recommend, or withdraws,
       modifies or amends in any respect adverse to NorthWestern its approval or
       recommendation of the purchase agreement or approves or recommends a
       superior proposal (as such term is defined under "The Purchase
       Agreement--No Solicitation By MPC And Touch America Holdings" below on
       page 51) or (ii) MPC or Touch America Holdings breach certain agreements;
       or

    (4) prior to MPC stockholders' approval, by MPC or Touch America Holdings if
       the MPC Board has determined that an acquisition proposal (as such term
       is defined under "The Purchase Agreement--No Solicitation By MPC And
       Touch America Holdings" below on page 51) constitutes a superior
       proposal; provided that (i) MPC has provided 3 business days' notice to
       NorthWestern, (ii) MPC has not taken any action to solicit any offers and
       has prepared and mailed this proxy statement and obtained MPC stockholder
       approval, (iii) the superior proposal is pending at the time of such
       termination, (iv) the MPC Board has determined in good faith that such
       proposal is a superior proposal, (v) MPC and Touch America Holdings have
       negotiated in good faith with NorthWestern with respect to any
       modifications to the terms of the purchase agreement proposed by
       NorthWestern that would enable MPC and NorthWestern to proceed with the
       sale of the utility business to NorthWestern, and (vi) MPC has paid the
       termination fee and expense fee discussed below.

                                       7
<PAGE>
    TERMINATION FEES; REIMBURSEMENT OF EXPENSES (PAGE 53)

    TERMINATION FEES

    MPC or Touch America Holdings must pay a termination fee of $50 million to
NorthWestern if:

    (1) the MPC Board fails to recommend or withdraws its approval of the
       purchase agreement, approves or recommends a superior proposal, or MPC or
       Touch America Holdings breach certain agreements in the purchase
       agreement pursuant to paragraph (3) under "--Termination of the Purchase
       Agreement" above; or

    (2) a takeover proposal has been made with respect to MPC and the purchase
       agreement is terminated by MPC or Touch America Holdings pursuant to
       paragraph (4) under "--Termination of the Purchase Agreement" above;
       provided, that the termination fee is not payable if Touch America
       Holdings or MPC fail to enter into an agreement to consummate, or do not
       consummate, a transaction the proposal of which would have constituted an
       acquisition proposal (as such term is defined under "The Purchase
       Agreement--No Solicitation By MPC And Touch America Holdings" below on
       page 51) within 12 months of the termination.

    REIMBURSEMENT OF EXPENSES

    MPC or Touch America Holdings must pay a reimbursement of expenses fee of
$10 million to NorthWestern if:

    (1) MPC, Touch America Holdings or NorthWestern terminates the purchase
       agreement because of the failure of MPC's shareholders to approve the
       purchase agreement;

    (2) NorthWestern terminates the purchase agreement because the MPC Board
       fails to recommend or withdraws its approval of the purchase agreement,
       or recommends a superior proposal, or MPC or Touch America Holdings
       breach certain agreements in the purchase agreement pursuant to
       paragraph (3) under "--Termination of the Purchase Agreement" above;

    (3) MPC or Touch America Holdings terminates the purchase agreement under
       the circumstances set forth in paragraph (4) above under "--Termination
       of the Purchase Agreement" above; or

    (4) NorthWestern terminates the purchase agreement because of a material
       breach of any representation, warranty or covenant which is not cured
       within 15 days written notice or cannot be cured by March 31, 2002.

    REGULATORY APPROVALS (PAGE 47)

    In order to complete the sale of the utility business to NorthWestern, Touch
America Holdings, MPC and NorthWestern must receive approvals from and/or make
filings with various federal and state regulatory agencies. At the federal
level, these approvals include approval of the Federal Energy Regulatory
Commission. In addition, the waiting period under the Hart-Scott-Rodino
Antitrust Improvements Act must have expired or been terminated. At the state
level, regulatory approval must be obtained from the Montana Public Service
Commission.

THE REDEMPTION OF THE PREFERRED STOCK (PAGE 58)

    On October 24, 2000, the members of the MPC Board present at the meeting
unanimously approved the redemption of all the outstanding Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series. Pursuant to MPC's Restated
Articles of Incorporation, dated March 24, 1998, the

                                       8
<PAGE>
redemption of the preferred stock depends on an affirmative vote of at least a
majority of the holders of MPC common stock.

    As of December 31, 2000 the amount outstanding under the Preferred Stock,
$6.00 Series was $16,000,000, and the amount outstanding under the Preferred
Stock, $4.20 Series was $6,000,000.

    Pursuant to MPC's Restated Articles of Incorporation, the Preferred Stock,
$6.00 Series is redeemable at any time, and the Preferred Stock, $4.20 Series is
redeemable at any time after May 1, 1969.

    If the redemption of the preferred stock is not approved by at least a
majority of all of MPC's common shareholders, each shareholder of Preferred
Stock, $4.20 Series and Preferred Stock, $6.00 Series will be deemed to receive
in the merger one share of Touch America Holdings' Preferred Stock, $4.20 Series
and Preferred Stock, $6.00 Series, for each outstanding share of Preferred
Stock, $4.20 Series and Preferred Stock, $6.00 Series, respectively. The terms
of the Touch America Holdings' Preferred Stock, $4.20 and Preferred Stock, $6.00
Series will be identical to the terms of Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, respectively.

                                       9
<PAGE>
                                 THE COMPANIES

THE MONTANA POWER COMPANY
40 E. Broadway Street
Butte, Montana 59701-9394
(406) 497-2000

Utility Business

    MPC currently operates regulated electric and natural gas utilities. MPC's
electric and natural gas service territory covers approximately 107,600 square
miles, or approximately 73 percent of Montana, making MPC one of the country's
largest utilities in terms of service territory. Dominant industries operating
within MPC's service territory are mining, agriculture, selected manufacturing,
railroads, tourism and recreation, and the forest-products industry. MPC serves
approximately 439,000 customers, or approximately 80 percent of the population
within its service territory.

    MPC's regulated electric utility purchases, transmits (movement of bulk
quantities of energy), and distributes (movement of energy from transmission
system to consumer) electric energy. MPC provides electric energy to 191
communities and their surrounding rural areas throughout Montana. MPC also
provides electric energy to Yellowstone National Park and to cooperatives that
serve approximately 76,000 residents.

    In addition to its regulated electric and natural gas utilities, MPC has
certain electric generation-related operations. Milltown Dam, constructed in
1906, is a three MW hydroelectric plant located near Missoula, Montana.
Generation from the facility is used to serve retail customers of MPC's electric
utility. Colstrip Unit 3 and Colstrip Unit 4 are twin 805 MW (gross) rated
coal-fired plants. MPC sold its 30% interest in Colstrip Unit 3 to PPL Montana
in December 1999, but MPC's 30% leased interest in Colstrip Unit 4 was not
included in that transaction. MPC's Colstrip Unit 4 interest is an unregulated
asset. Its leasehold interest is the result of a 1985 sale/leaseback
transaction. As lessee, MPC makes annual lease payments and utilizes all of the
electrical generation associated with its 30% interest in Colstrip Unit 4
(approximately 220 MW). MPC has entered into two long-term power sales
agreements, which utilize such generation from Colstrip Unit 4.

    MPC also operates a number of direct subsidiaries:

    - One Call Locators, Ltd. operates a line locating service in several states
      that provides services to utilities and others that own or operate
      underground pipes and wires,

    - Discovery Energy Solutions, Inc. provides a variety of energy-related
      products and services designed to reduce the energy costs of its
      customers, who are primarily industrial, commercial, and institutional
      entities in the western United States,

    - Canadian-Montana Pipe Line Corporation owns and operates natural gas
      pipeline border-crossing facilities for the transportation of natural gas
      between Canada and Montana. Three of the four border-crossing facilities
      that this company currently owns will be sold to a former MPC subsidiary
      transferred to PanCanadian Petroleum Limited as part of the sale of MPC's
      oil and gas business,

    - Montana Power Services Company was formed as an entity to hold common
      corporate properties and provides centralized shared administrative
      services for MPC and its various subsidiaries and business units. This
      company has held title to various buildings and software licenses shared
      by such business units, but by the time of completion of the sale of the
      utility business to NorthWestern, it is expected to have transferred such
      assets to either Touch America, Inc. or MPC, and

                                       10
<PAGE>
    - Colstrip Community Services Company historically provided real estate and
      other services in Colstrip, Montana. Such services have been taken over by
      PPL Montana or the city of Colstrip, and this company no longer has any
      active operations or services.

    MPC also owns the equity interests in two business trusts established in
connection with financing transactions:

    - Montana Power Capital 1 is a statutory business trust created under
      Delaware law, the sole purpose of which is to issue preferred securities
      for the benefit of MPC. In November 1996, the entity issued $65 million of
      preferred securities, the proceeds of which went to MPC.

    - MPC Natural Gas Funding Trust entity is a special purpose statutory
      Delaware business trust that is the financing vehicle used in connection
      with recovery of transition costs associated with the transfer of the
      natural gas utility's production assets to unregulated affiliates in 1997.
      In December 1998, this entity issued $63 million in transition bonds to
      refinance these transition costs for the benefit of natural gas customers.

Non-Utility Business

    Prior to the restructuring, MPC will have sold all of its non-utility energy
business consisting of its oil and gas business, coal business and independent
power production business.

TOUCH AMERICA HOLDINGS, INC.
40 E. Broadway Street
Butte, Montana 59701-9394
(406) 497-2000

    Touch America Holdings is a company incorporated in the State of Delaware.
Following the restructuring, Touch America Holdings will become the owner of the
operating businesses of Touch America, Inc. and Tetragenics Company, and the
owner of the single membership interest in Entech LLC.

Touch America, Inc.

    Touch America, Inc. owns a 18,000-mile fiber-optic network that is expected
to reach 26,000 miles by year-end 2001. Touch America uses the network to
provide voice, data, and video transport services to wholesale, commercial
business and residential customers. Products include dark fiber and conduit
sales, bandwith sales, leases and trades, and private line, ATM frame relay,
voice, wireless, and Internet services. Touch America, Inc. is focused on
increasing network traffic principally through a combination of relationships
with anchor customers (large-volume commercial or wholesale customers),
alliances with third parties, and acquisitions.

    On June 30, 2000, Touch America, Inc. acquired from Qwest Communications
International Inc. wholesale and retail private line, ATM, frame relay, and
long-distance telecommunications services which currently serve approximately
250,000 customers in the Pacific Northwest, Rocky Mountain, and upper Midwest
regions, Touch America, Inc. also acquired approximately 1,800 route riles of
fiber within these regions.

    Touch America, Inc. is constructing a 4,300 mile fiber network, in
conjunction with AT&T. The network includes new fiber routes from Minneapolis to
Chicago; from St. Louis, Missouri to Plano, Illinois; from Sacramento to Salt
Lake City; from Salt Lake City to Denver; from Denver through Nebraska and Iowa
to Chicago; and from Seattle to Billings, Montana. It is expected that various
third parties, including AT&T, will cover approximately one-half of the
estimated $500,000,000 total project cost.

                                       11
<PAGE>
    Touch America, Inc. and Sierra Pacific Communications, a subsidiary of
Sierra Pacific Resources, entered into a joint venture in 2000, Sierra Touch
America LLC, to construct a new 750-mile fiber optic network between Sacramento
and Salt Lake City. Under terms of the agreement, Sierra Touch America also will
assume part interest in the metropolitan fiber networks Sierra Pacific
Communications has in Reno and Las Vegas. Customers served by the local networks
will have the opportunity to access and receive information directly from Touch
America, Inc.'s broadband fiber network.

    In January 2000, Touch America, Inc. announced an exchange of fiber and
conduits with PF.Net, a telecommunications company based in New Jersey. Touch
America Inc. will receive approximately 5,900 route miles from PF.Net, with all
segments expected to be complete by the end of 2001.

    Touch America, Inc. and Xcel Energy (formerly New Century Energies) entered
into a joint venture in 1999, Northern Colorado Telecommunications LLC, to
provide a full range of telecommunications services, including private-line
services, to enterprises in the Denver metropolitan area. Primarily through its
PCS and LMDS technologies, Touch America Holdings is creating "last-mile"
connections, which connect a fiber network via wireless applications. In 1999,
Touch America Holdings and Qwest Wireless (formerly US West Wireless) entered
into a joint venture, TW Wireless (TWW), to provide "one number" telephone
service in an eight-state region of the Pacific Northwest and Upper Midwest.
That service provides a customer with one directory number for cell phone and
home or business telephones.

                                     [LOGO]

                                       12
<PAGE>
Tetragenics Company

    Tetragenics, an affiliate of Touch America, Inc., develops, manufactures,
and markets alarm control systems, communication monitoring and control systems,
automation systems, intelligent remote units, and computer based products.
Tetragenics provides the tools to monitor and control any type of communication
system, such as microwave, fiber optic, hardwire, satellite, and radio.

    In 1999, Tetragenics formed a partnership with New Horizon Technologies,
LLC, where Tetragenics is 50.5% owner of this LLC. New Horizon Technologies
provides monitoring and energy information systems technologies.

    Tetragenics provides engineering, research and design, and NOC monitoring
equipment to Touch America, Inc. Tetragenics also provides engineering services
and equipment for TW Wireless, the joint venture between Touch America Holdings
and Qwest Wireless (formerly, US West Wireless). Other Tetragenics' customers
include American Towers Company, Verizon (formerly AirTouch), Midstate Electric
Cooperative, ComEd, California Department of Water Resources, Army Corps of
Engineers, Rochester Gas and Electric, City of Tacoma, Louisiana Hydro Electric,
Avista Utilities, Northern Telephone, Montana Power, Lewis County Public Utility
District, Butte Water Division, Glacier National Park, as well as other
customers across the United States, Canada, and Mexico.

Entech LLC

    Entech, Inc., a Montana corporation, is a wholly-owned subsidiary which owns
MPC's non-regulated businesses. Prior to the restructuring, Entech, Inc. will
merge with and into Entech LLC, a Montana limited liability company and a
wholly-owned subsidiary of MPC.

    Following the restructuring, Entech LLC will become a wholly-owned
subsidiary of Touch America Holdings. Entech LLC will not own any operating
companies but will remain in existence solely to satisfy any contingent
obligations or liabilities that may exist in connection with the sales of the
oil and gas business, the coal business and the independent power production
business. See "Background of the Restructuring" below on page 32.

    The following chart reflects the corporate structure of MPC and Touch
America Holdings prior to the restructuring, following the merger, and following
the sale of the utility business to NorthWestern, at which point the
restructuring will be complete.

                                       13
<PAGE>
                THE MONTANA POWER COMPANY PRIOR TO RESTRUCTURING

                                  [FLOW CHART]

                 THE MONTANA POWER COMPANY FOLLOWING THE MERGER

                                  [FLOW CHART]

                                       14
<PAGE>
                 TOUCH AMERICA HOLDINGS AFTER THE RESTRUCTURING

                                  [FLOW CHART]

    MARKET PRICE AND DIVIDEND INFORMATION

    MPC's common shares are listed on the New York Stock Exchange and the
Pacific Exchange, Inc.. The following table presents the closing price of one
MPC common share, as reported on the New York Stock Exchange Composite
Transaction reporting system on September 29, 2000, the last full trading day
prior to the public announcement of the sale of the utility business to
NorthWestern, and on [      ], 2001, the last trading day for which this
information could be calculated prior to the date of this proxy
statement/prospectus.

<TABLE>
<CAPTION>
                                                                   MPC
                                                                  COMMON
DATE                                                              SHARE
----                                                          --------------
<S>                                                           <C>
September 29, 2000..........................................  $        33.38
[            ], 2001........................................  $            []
</TABLE>

    On October 24, 2000, the MPC Board voted to eliminate common dividend
payments effective the first quarter of 2001. The final quarterly dividend
declared by MPC was $.20 per share payable on November 1, 2000. However,
preferred dividends of MPC will not be affected by this decision.

    Following the restructuring and for the foreseeable future, Touch America
Holdings does not expect to pay dividends on its common stock.

                                       15
<PAGE>
                 CERTAIN FACTORS RELATING TO THE RESTRUCTURING

    SHAREHOLDERS OF MPC SHOULD CONSIDER CAREFULLY ALL THE INFORMATION CONTAINED
IN THIS PROXY STATEMENT/PROSPECTUS, INCLUDING THE FOLLOWING MATTERS:

CERTAIN FACTORS RELATING TO THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN

    DELAY IN REGULATORY APPROVALS WILL DELAY AND POSSIBLY PREVENT THE SALE OF
    THE UTILITY BUSINESS TO NORTHWESTERN

    The consummation of the sale of the utility business to NorthWestern is
conditioned upon receiving approval from various governmental regulatory
authorities. These include:

    - approval by the Montana Public Service Commission;

    - approval by the Federal Energy Regulatory Commission under the Federal
      Power Act; and

    - the expiration or termination of the applicable waiting period under the
      Hart-Scott-Rodino Antitrust Improvements Act.

    While we expect to obtain the required regulatory approvals within
6 months, MPC, Touch America Holdings and NorthWestern cannot be certain that
all of the required approvals and consents will be obtained, nor can they be
certain that the approvals and consents will be obtained within the time
contemplated by the purchase agreement. A delay in obtaining the required
approvals and consents will delay and possibly prevent the consummation of the
sale of the utility business to NorthWestern. In addition, MPC, Touch America
Holdings and NorthWestern may obtain the required approvals and consents, but
with terms or conditions that may have a material adverse effect on MPC or The
Montana Power L.L.C. NorthWestern will not be obligated to consummate the
transaction if these terms or conditions would have a material adverse effect on
MPC or The Montana Power L.L.C. and their prospective subsidiaries.

    For additional information on the required regulatory approvals, see
"Regulatory Matters" below on page 47.

CERTAIN FACTORS RELATING TO THE INDUSTRY IN WHICH TOUCH AMERICA HOLDINGS WILL
OPERATE FOLLOWING THE RESTRUCTURING

    Following the restructuring, MPC will have been transformed into Touch
America Holdings, whose operating businesses will be comprised solely of MPC's
telecommunications businesses (Touch America, Inc. and Tetragenics Company). You
should carefully consider the following factors which relate to Touch America
Holdings. While many of these factors were applicable to the telecommunications
businesses of MPC prior to the restructuring, following the restructuring the
telecommunications business will constitute the entire business of Touch America
Holdings as compared to its current status as one of the several operating
businesses of MPC. Consequently, the following factors are highly relevant in
connection with your decision to approve the restructuring and to be deemed to
receive shares of Touch America Holdings in exchange for your shares of MPC.

CERTAIN FACTORS RELATING TO TOUCH AMERICA HOLDINGS' BUSINESS

    COMMUNICATIONS TECHNOLOGY CHANGES VERY RAPIDLY AND TOUCH AMERICA HOLDINGS'
    TECHNOLOGY COULD BE RENDERED OBSOLETE

    Touch America Holdings expects that new products and technologies will
emerge and that existing products and technologies, including voice transmission
over the Internet and high speed transmission

                                       16
<PAGE>
of packets of data, will further develop. These new products and technologies
may reduce the prices for Touch America Holdings' services or they may be
superior to, and render obsolete, the products and services Touch America
Holdings offers and the technologies Touch America Holdings uses. As a result,
Touch America Holdings' most significant competitors in the future may be new
entrants to its markets which would not be burdened by an installed base of
older equipment. It may be very expensive for Touch America Holdings to upgrade
its products and technologies in order to continue to compete effectively. Touch
America Holdings' future success depends, in part, on its ability to anticipate
and adapt in a timely manner to technological changes, including wider
acceptance and usage of voice transmission over the Internet.

    DIFFICULTIES IN CONSTRUCTING THE NETWORK COULD INCREASE ITS ESTIMATED COST
    AND DELAY ITS SCHEDULED COMPLETION

    The construction, operation and any upgrading of the network is a
significant undertaking. Administrative, technical, operational and other
problems that could arise may be more difficult to address and solve due to the
significant size and complexity of the planned network. Touch America Holdings
will also be dependent on timely performance by third-party suppliers and
contractors. In addition, important aspects of the network, will rely on
technology that is in the development stage or that is largely commercially
unproven. New technology also may not be compatible with existing technology.
Many of these factors and problems are beyond Touch America Holdings' control.
As a result, the entire network may not be completed as planned for the cost and
in the time frame that is currently estimated. Touch America Holdings may be
materially adversely affected as a result of any significant increase in the
estimated cost of the network or any significant delay in its anticipated
completion.

    Future expansions and adaptations of the network's electronic and software
components may be necessary in order to respond to:

    - a growing number of customers;

    - increased demands by customers to transmit larger amounts of data;

    - changes in customers' service requirements; and

    - technological advances by competitors.

    Any expansion or adaptation of the network will require substantial
additional financial, operational and managerial resources. If Touch America
Holdings is unable to expand or adapt the network to respond to these
developments on a timely basis and at a commercially reasonable cost, then its
business will be materially adversely affected.

    IF TOUCH AMERICA HOLDINGS CANNOT QUICKLY AND EFFICIENTLY INSTALL ITS
    HARDWARE, IT MAY NOT BE ABLE TO EFFECTIVELY GENERATE REVENUE

    Touch America Holdings' networks will consist of many different pieces of
hardware, including switches, routers, fiber optic cables, electronics and
combination radio transmitter/receivers, known as transceivers, and associated
equipment, which are difficult to install. If this hardware cannot be installed
quickly, the time in which customers can be connected to the network and Touch
America Holdings can begin to generate revenue from the network will be delayed.
If Touch America Holdings fails to complete its network on time or if the
network fails to perform as specified, Touch America Holdings' strategy of
creating an end-to-end national network will be delayed.

                                       17
<PAGE>
    TOUCH AMERICA HOLDINGS NEEDS TO INCREASE THE VOLUME OF TRAFFIC ON THE
    NETWORK OR THE NETWORK WILL NOT CONTINUE TO GENERATE PROFITS

    Touch America Holdings must substantially increase the current volume of
voice, data, Internet and video transmission on the network in order to realize
the anticipated cash flow, operating efficiencies and cost benefits of the
network. If Touch America Holdings does not develop sufficient commitments with
new large-volume customers as well as maintain its relationships with current
customers, Touch America Holdings will be unable to increase traffic on the
network, which would adversely affect Touch America Holdings' profitability.

    Touch America Holdings believes that an important source of increased
traffic will be from the introduction by regional telephone companies of long
distance services within their historical service areas once they satisfy the
applicable requirements under the Telecommunications Act of 1996. Accordingly,
delays in the introduction of these services could have an adverse effect on
Touch America Holdings' traffic flow. Further, some of these regional telephone
companies have already entered preferred provider arrangements with long-haul
companies that compete with Touch America Holdings.

    TOUCH AMERICA HOLDINGS MAY NOT BE ABLE TO CONNECT ITS NETWORK TO THE
    INCUMBENT CARRIER'S NETWORK OR TO CERTAIN BACK BONE PROVIDERS ON FAVORABLE
    TERMS OR AT ALL

    Touch America Holdings requires interconnection agreements with the
incumbent carrier to connect its customers to the public telephone network and
to certain other Internet peering providers and other carriers. There is no
assurance that Touch America Holdings will be able to negotiate or renegotiate
interconnection agreements in all of its markets on favorable terms, or in a
timely fashion. Unacceptable terms or untimely response from the incumbent
carrier may cause poor customer service and loss of customers and revenue for
Touch America Holdings.

    IT IS EXPENSIVE AND DIFFICULT TO SWITCH NEW CUSTOMERS TO THE NETWORK, AND
    PROVISIONING BOTTLENECKS WITH THE INCUMBENT AND OTHER CARRIERS CAN SLOW THE
    NEW CUSTOMER CONNECTION PROCESS

    It is expensive and difficult to switch a new customer to Touch America
Holdings' network because:

    - a potential customer faces switching costs if it decides to become a
      customer, and

    - cooperation is required from the incumbent and other carriers in instances
      where there is no direct connection between the customer and Touch America
      Holdings' network.

The incumbent carriers are already established providers of local telephone
services to all or virtually all telephone subscribers within their respective
service areas. Their physical connections from their premises to those of their
customers are expensive and difficult to duplicate. To complete the new customer
provisioning process, the incumbent carrier must process certain information.
The incumbent carriers have an interest in retaining a direct relationship with
their customers, which could reduce their willingness to cooperate with Touch
America Holdings' new customer provisioning requests.

    NETWORK FAILURE, BREACHES OR DELAYS AND ERRORS IN TRANSMISSIONS EXPOSE TOUCH
    AMERICA HOLDINGS TO POTENTIAL LIABILITY, AND LOSS OF CUSTOMERS AND REVENUE

    Touch America Holdings' network will use a collection of communications
equipment, software, operating protocols and proprietary applications for the
high-speed transportation of large quantities of data among multiple locations.
Given the complexity of Touch America Holdings' proposed network, it may be
possible that data will be lost or distorted. Delays in data delivery may cause
significant losses

                                       18
<PAGE>
to a customer using the network. The network may also contain undetected design
faults and software bugs that, despite testing, may be discovered only after the
network has been installed and is in use. The failure of any equipment or
facility on the network could result in the interruption of customer service
until necessary repairs or the installation of replacement equipment. Network
failures, delays and errors could also result from natural disasters, power
losses, security breaches and computer viruses. These failures, faults or errors
could cause delays, service interruptions, expose Touch America Holdings to
customer liability or require expensive modifications that could have a material
adverse effect on Touch America Holdings' business.

    TOUCH AMERICA, INC. NEEDS TO OBTAIN ADDITIONAL OFF-NETWORK CAPACITY FROM
    OTHER PROVIDERS IN ORDER TO SERVE ITS CUSTOMERS AND KEEP ITS COSTS DOWN

    Touch America Holdings leases telecommunications capacity and obtains rights
to use dark fiber from both long distance and local telecommunications carriers
in order to extend the range of the network. Any failure by these companies to
fulfill their obligations to Touch America Holdings would adversely affect its
ability to serve its customers or increase its costs of doing so.

    Costs of obtaining local services from other carriers comprise a significant
proportion of the operating expenses of long distance carriers, like Touch
America Holdings. Similarly, a large proportion of the costs of providing
international services consists of payments to other carriers. Changes in
regulation, particularly the regulation of local and international
telecommunications carriers, could indirectly but significantly affect Touch
America Holdings' competitive position; such changes could increase or decrease
Touch America Holdings' costs, relative to those of its competitors, of
providing services.

    TOUCH AMERICA HOLDINGS' BUSINESS PLAN REQUIRES THE DEVELOPMENT OF EFFECTIVE
    BUSINESS SUPPORT SYSTEMS TO IMPLEMENT CUSTOMER ORDERS TO PROVIDE AND BILL
    FOR SERVICES

    Touch America Holdings' business plan depends on its ability to develop
effective business support systems. This is a complicated undertaking requiring
significant resources and expertise and support from third-party vendors.
Business support systems are needed for:

    - implementing customer orders for services;

    - provisioning, installing and delivering these services; and

    - monthly billing for these services.

    Since the business plan provides for rapid growth in the number and volume
of products and services offered, there will be a need to develop these business
support systems on a schedule sufficient to meet the proposed service rollout
dates. In addition, these business support systems will be required to expand
and adapt with Touch America Holdings' rapid growth. The failure to develop
effective business support systems could have a material adverse effect on Touch
America Holdings' ability to implement its business plan.

    TOUCH AMERICA HOLDINGS MUST OBTAIN AND MAINTAIN PERMITS AND RIGHTS-OF-WAY TO
    DEVELOP THE NETWORK

    The operation of Touch America Holdings' networks requires that it obtain
many local franchises and other permits. Touch America Holdings must also obtain
rights to use underground conduit and aerial pole space and other rights-of-way
and fiber capacity. The process of obtaining these franchises, permits and
rights is time consuming and burdensome and increases the cost of doing
business. If it is unable, on acceptable terms and on a timely basis, to obtain
and maintain the franchises, permits and

                                       19
<PAGE>
rights needed to implement its business plan, the buildout of its network could
be materially adversely affected. In addition, the cancellation or non-renewal
of the franchises, permits or rights to be obtained, or the loss of the
rights-of-way obtained, could materially adversely affect Touch America
Holdings.

CERTAIN FACTORS RELATED TO COMPETITION IN THE TELECOMMUNICATIONS INDUSTRY

    TOUCH AMERICA HOLDINGS' OPERATES IN A HIGHLY COMPETITIVE INDUSTRY WITH
    PARTICIPANTS THAT HAVE GREATER RESOURCES AND EXISTING CUSTOMERS THAN TOUCH
    AMERICA HOLDINGS HAS, WHICH COULD LIMIT TOUCH AMERICA HOLDINGS' ABILITY TO
    INCREASE ITS MARKET SHARE

    Touch America Holdings' success depends upon its ability to increase its
share of the telecommunication services market by providing high quality
services at prices equal to or below those of its competitors. Increased
competition could lead to price reductions, fewer large-volume sales,
under-utilization of resources, reduced operating margins and loss of market
share. Many of its competitors have, and some potential competitors are likely
to enjoy, substantial competitive advantages, including the following:

    - greater name recognition

    - greater financial, technical, marketing and other resources

    - larger installed bases of customers and revenue

    - well-established relationships with current and potential customers

    - more extensive knowledge of the high-volume long distance services
      industry

    - greater international presence

    Touch America Holdings' competitors include, among others, Level 3
Communications, Inc., Global Crossing Ltd., 360networks, Inc., Broadwing Inc.,
Qwest Communications International, Inc. and Williams Communications
Group Inc., as well as the three U.S. long distance fiber optic networks that
are owned by each of AT&T Corp., MCI WorldCom, Inc. and Sprint Corp.

    In addition, significant new competitors could arise as a result of:

    - increased consolidation and strategic alliances in the industry resulting
      from recent Congressional and Federal Communications Commission actions;

    - allowing foreign carriers to compete in U.S. markets;

    - further technological advances; and

    - further deregulation and other regulatory initiatives.

    INCREASED INDUSTRY CAPACITY AND OTHER FACTORS COULD LEAD TO LOWER PRICES FOR
    PRODUCTS AND SERVICES

    AT&T Corp., MCI WorldCom, Inc., Sprint Corp., Global Crossing Ltd.,
360networks, Inc., Broadwing Inc., Qwest Communications International, Inc., and
Williams Communications Group, Inc. currently own and others are constructing
nationwide long-distance fiber optic networks. In addition, there are numerous
local and regional long distance networks. Increased capacity may cause
significant decreases in the prices for services. Prices may also decline due to
capacity increases resulting from technological advances and strategic
alliances. These price declines may be particularly severe if recent trends
causing increased demand for capacity, such as Internet usage, change. Rapid
growth in the use

                                       20
<PAGE>
of the Internet is a recent phenomenon, and may not continue at the same rate.
Increased competition has already led to a decline in rates charged for various
telecommunications services.

    FAILURE TO DEVELOP THE "TOUCH AMERICA" BRAND COULD ADVERSELY AFFECT TOUCH
    AMERICA HOLDINGS' BUSINESS

    Brand recognition is very important in the communications industry. If the
"Touch America" brand awareness does not increase or is weakened, it could
decrease the ability of Touch America Holdings' product and service offerings to
potential customers to penetrate the market, which could result in decreased
revenues or slower than anticipated growth.

    SUCCESS DEPENDS ON RETENTION OF CERTAIN KEY PERSONNEL AND THE ABILITY TO
    HIRE ADDITIONAL KEY PERSONNEL

    Touch America Holdings depends on the performance of its executive officers
and key employees. In particular, its senior management has significant
experience in the telecommunications industry, and the loss of any of them could
negatively affect Touch America, Inc.'s ability to execute its business
strategy.

    Touch America Holdings future success also depends on a continuing ability
to identify, hire, train and retain other highly qualified technical, sales,
marketing, legal and managerial personnel in connection with its expansion
within existing regions and the deployment of its network into targeted regions.
Competition for such qualified personnel is intense. This is particularly the
case in network engineering and product management. Touch America Holdings may
also be unable to attract, assimilate or retain other highly qualified
technical, operations, sales, marketing, legal and managerial personnel. Its
business will be harmed if it cannot attract the necessary technical, sales,
marketing, legal and managerial personnel.

CERTAIN FACTORS RELATING TO REGULATION

    TOUCH AMERICA HOLDINGS IS SUBJECT TO SIGNIFICANT REGULATION THAT COULD
    CHANGE IN AN ADVERSE MANNER

    Communications services are subject to significant regulation at the
federal, state, local and international levels. These regulations affect Touch
America Holdings and its existing and potential competitors. Delays in receiving
required regulatory approvals, completing interconnection agreements with
incumbent local exchange carriers or the enactment of new and adverse
regulations or regulatory requirements may have a material adverse effect on
Touch America Holdings. In addition, future legislative, judicial, and
regulatory agency actions could have a material adverse effect on Touch America
Holdings.

    Federal legislation provides for a significant deregulation of the U.S.
telecommunications industry, including the local exchange, long-distance and
cable television industries. This legislation remains subject to judicial review
and additional Federal Communications Commission rulemaking. As a result, it is
impossible to predict the legislation's effect on Touch America Holdings' future
operations. Many regulatory actions are under way or are being contemplated by
federal and state authorities regarding important items. All of these actions
could have a material adverse effect on Touch America Holdings.

                                       21
<PAGE>
CERTAIN FACTORS REGARDING STOCK PRICE; OPERATIONS

    THE PRICE OF TOUCH AMERICA HOLDINGS' COMMON STOCK MAY FLUCTUATE
    SIGNIFICANTLY, WHICH MAY RESULT IN LOSSES FOR INVESTORS

    The market price for Touch America Holdings' common stock may be volatile.
It is expected that Touch America Holdings' common stock will be subject to
fluctuations as a result of a variety of factors, including factors beyond its
control. These include:

    - quarterly variations in operating results;

    - changes in financial estimates by securities analysts;

    - changes in market valuations of telecommunications and Internet-related
      companies;

    - announcements by Touch America Holdings or its competitors of new products
      or of significant acquisitions, strategic relationships or joint ventures;

    - any loss of a major customer;

    - additions or departures of key personnel;

    - any deviations in net revenues or in losses from levels expected by
      securities analysts;

    - future sales of common stock; and

    - volume fluctuations, which are particularly common among highly volatile
      securities of Internet related companies.

    OPERATING RESULTS ARE LIKELY TO FLUCTUATE IN FUTURE PERIODS AND MAY FAIL TO
    MEET THE EXPECTATIONS OF SECURITIES ANALYSTS AND INVESTORS

    Touch America Holdings' annual and quarterly operating results are likely to
fluctuate significantly in the future as a result of numerous factors, many of
which are outside of Touch America Holdings' control. These factors include:

    - the amount and timing of capital expenditures and other costs relating to
      the expansion of Touch America Holdings' network and the marketing of
      Touch America Holdings' services;

    - the ability to develop and commercialize new services by Touch America
      Holdings or its competitors;

    - the ability to order or deploy Touch America Holdings' services on a
      timely basis to adequately satisfy end-user demand;

    - Touch America Holdings' ability to successfully operate its network;

    - the rate at which customers subscribe to Touch America Holdings' services;

    - decreases in the prices for Touch America Holdings' services due to
      competition, volume-based pricing and other factors;

    - Touch America Holdings' ability to retain Internet service provider,
      enterprises and telecommunications carrier customers and limit end-user
      churn rates;

    - receipt of timely payment from Touch America Holdings' Internet service
      provider and other customers;

    - the mix of product and service orders between consumer end-users and
      business end-users (which typically have higher margins);

                                       22
<PAGE>
    - the success of Touch America Holdings' relationships with third parties in
      generating significant end-user demand;

    - the development and operation of Touch America Holdings' billing and
      collection systems and other operational systems and processes;

    - the incorporation of enhancements, upgrades and new software and hardware
      products into Touch America Holdings' network and operational processes
      that may cause unanticipated disruptions;

    - the changing interpretation and enforcement of regulatory developments and
      court rulings concerning the 1996 Telecommunications Act, interconnection
      agreements and the anti-trust laws;

    - Touch America Holdings' ability to integrate the businesses it acquires
      into its business efficiently; and

    - the availability of equipment and services from key vendors.

As a result, it is likely that in some future quarters Touch America Holdings'
operating results will be below the expectations of securities analysts and
investors. If this happens, the trading price of Touch America Holdings' common
stock would likely decline.

ANTI-TAKEOVER PROVISIONS COULD LIMIT TOUCH AMERICA HOLDINGS' SHARE PRICE AND
DELAY A CHANGE OF MANAGEMENT

    Touch America Holdings' certificate of incorporation and by-laws contain
provisions that could make it more difficult or even prevent a third party from
acquiring Touch America Holdings without the approval of its incumbent board of
directors. These provisions, among other things:

    - divide Touch America Holdings' board of directors into three classes, with
      members of each class to be elected in staggered three-year terms;

    - prohibit stockholder action by written consent in place of a meeting;

    - limit the right of stockholders to call special meetings of stockholders;

    - limit the right of stockholders to present proposals or nominate directors
      for election at annual meetings of stockholders; and

    - authorize Touch America Holdings' board of directors to issue preferred
      stock in one or more series without any action on the part of
      stockholders.

    These provisions could limit the price that investors might be willing to
pay in the future for shares of Touch America Holdings' common stock and
significantly impede the ability of the holders of Touch America Holdings'
common stock to change management. In addition, Touch America Holdings will
adopt a Shareholder Protection Rights Plan between the effective date of Touch
America Holdings' registration statement on Form S-4 and the effective time of
the merger, which has anti-takeover effects. The rights plan, if triggered, will
cause substantial dilution to a person or group that attempts to acquire Touch
America Holdings on terms not approved by Touch America Holdings' board of
directors. Provisions and agreements that inhibit or discourage takeover
attempts could reduce the market value of Touch America Holdings' common stock.
For additional information, see "Description of Touch America Holdings' Capital
Stock" below on page 68 and "Comparison of Shareholder Rights" below on
page 71.

                                       23
<PAGE>
CERTAIN ADDITIONAL FACTORS RELATING TO TOUCH AMERICA HOLDINGS

    TOUCH AMERICA HOLDINGS HAS MADE AND MAY MAKE ACQUISITIONS OF COMPLEMENTARY
    TECHNOLOGIES OR BUSINESSES IN THE FUTURE, WHICH MAY DISRUPT ITS BUSINESS

    Touch America Holdings intends to consider acquisitions of businesses and
technologies in the future on an opportunistic basis. Acquisitions of businesses
and technologies involve numerous risks, including the diversion of management
attention, difficulties in assimilating the acquired operations, loss of key
employees from the acquired company, and difficulties in transitioning key
customer relationships. In addition, these acquisitions may result in dilutive
issuances of equity securities, the incurrence of additional debt, large
one-time expenses and the creation of goodwill or other intangible assets that
result in significant amortization expense. Any acquisition may not provide the
benefits originally anticipated, and there may be difficulty in integrating the
service offerings and networks gained through acquisitions and strategic
investments with Touch America Holdings' own service offerings and networks. In
a strategic investment where the acquisition is of a minority interest in a
company, the acquirer may lack control over the operations and strategy of the
business, and it cannot be guaranteed that such lack of control will not
interfere with the integration of services and distribution channels of the
business with Touch America Holdings' own strategy and business operations.
Although attempts will be made to minimize the risk of unexpected liabilities
and contingencies associated with acquired businesses through planning,
investigation and negotiation, such unexpected liabilities nevertheless may
accompany such strategic investments and acquisitions. There is no guarantee
that Touch America Holdings will:

    - identify attractive acquisition and strategic investment candidates;

    - complete and finance additional acquisitions on favorable terms; or

    - integrate the acquired assets into Touch America Holdings' own business.

There is no guarantee that the integration of Touch America Holdings' business
with any acquired company's business will be accomplished smoothly or
successfully, if at all. Any of these factors could materially harm Touch
America Holdings' business or Touch America Holdings' operating results in a
given period.

    TOUCH AMERICA HOLDINGS MUST COMPLY WITH FEDERAL AND STATE TAX AND OTHER
    SURCHARGES ON ITS SERVICE THE LEVELS OF WHICH ARE UNCERTAIN

    Telecommunications providers pay a variety of surcharges and fees on their
gross revenues from interstate services and intrastate services. Interstate
surcharges include Federal Universal Service Fees and Common Carrier Regulatory
Fees. In addition, state regulators impose similar surcharges and fees on
intrastate services. The division of Touch America Holdings' services between
interstate services and intrastate services is a matter of interpretation and
may in the future be contested by the Federal Communications Commission or
relevant state commission authorities.

    The Federal Communications Commission is currently considering the
jurisdictional nature of ISP-bound traffic, as a result of a March 24, 2000
decision by the United States Court of Appeals for the D.C. Circuit related to
the jurisdictional nature of analog, dial-up traffic to the Internet. A change
in the characterization of their jurisdictions could cause Touch America
Holdings' payment obligations, pursuant to the relevant surcharges, to increase.
In addition, pursuant to periodic revisions by state and federal regulators of
the applicable surcharges, Touch America Holdings may be subject to increases in
the surcharges and fees currently paid.

                                       24
<PAGE>
    AN ECONOMIC DOWNTURN COULD ADVERSELY IMPACT DEMAND FOR SERVICES

    In the last few years, the general health of the economy has been relatively
strong and growing, a consequence of which has been increasing capital spending
by individuals and growing companies to keep pace with rapid technological
advances. To the extent the general economic health of the United States
declines from recent historically high levels, or to the extent individuals or
companies fear such a decline is imminent, such individuals and companies may
reduce, in the near term, expenditures such as those for Touch America Holdings'
services. Any such decline or concern about an imminent decline could delay
decisions by prospective customers to make initial evaluations of Touch America
Holdings' services. Such delays would have a material adverse effect on Touch
America Holdings' business, prospects, operating results and financial
condition.

                                       25
<PAGE>
        SELECTED HISTORICAL CONDENSED CONSOLIDATED FINANCIAL DATA OF MPC

    MPC is providing the following financial information to aid you in your
analysis of the financial aspects of the restructuring. This information is only
a summary and you should read it in conjunction with MPC's audited consolidated
financial statements as of December 31, 1999 and 1998 and for each of the three
years in the period ended December 31, 1999, as retroactively reclassified to
report MPC's coal businesses and oil and natural gas businesses as discontinued
operations. These reclassified consolidated financial statements are included in
this proxy statement/prospectus. See "Index to Financial Statements" below on
page F-1. You should also read this information in conjunction with the
historical consolidated financial statements of MPC and the related notes
contained in annual reports and other information that MPC has previously filed
with the Securities and Exchange Commission, or SEC. See "Where You Can Find
More Information" below on page 79.

    As mentioned above and included in this proxy statement/prospectus, we have
reclassified historical financial information presented in our 1999 Annual
Report on Form 10-K to reflect discontinued operations accounting treatment for
oil and natural gas operations and coal operations. See "Index to Financial
Statements" below on page F-1. We entered into a definitive agreement to sell
our oil and natural gas operations on August 25, 2000 and a definitive agreement
to sell our coal operations on September 15, 2000. Both agreements were subject
to customary closing conditions. We applied discontinued operations accounting
treatment to both of these operations effective September 1, 2000 and, as a
result, we have reclassified our income statements and cash flow statements for
all periods presented to show financial results and cash flows on a continuing/
discontinued basis. The following table presents our selected historical
condensed consolidated financial data for each of the five years in the period
ended December 31, 1999 and for the nine months ended September 30, 2000. We
have not presented financial data for the nine months ended September 30, 1999,
as it is presented in our Form 10-Q filed with the SEC on November 14, 2000, and
because it is not materially different than the December 31, 1999 income
statement and balance sheet data shown below.

<TABLE>
<CAPTION>
                                                                           FOR THE YEAR ENDED
                                                    ----------------------------------------------------------------
                                                                        DECEMBER 31,
                                                    ----------------------------------------------------
                                                         UNAUDITED
                                                    -------------------                                    UNAUDITED
                                                      1995       1996       1997       1998       1999      9/30/00
                                                    --------   --------   --------   --------   --------   ---------
                                                            (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA
  Operating revenues..............................   $  649     $  688     $  696     $  877     $  812     $  680
  Operating expenses..............................      495        510        533        622        643        598
  Operating income................................      154        178        163        255        169         82
  Net income from continuing operations for common
    shares........................................       64         69         74        122         95         36
  Basic net income per common share from
    continuing operations.........................     0.60       0.64       0.68       1.11       0.86       0.35
  Basic net income per common share...............     0.46       1.02       1.14       1.47       1.34       0.85
  Diluted net income per common share from
    continuing operations.........................     0.60       0.64       0.68       1.11       0.86       0.34
  Diluted net income per common share.............     0.46       1.02       1.14       1.47       1.33       0.84
  Ratio of earnings to fixed charges..............     2.42x      2.52x      2.28x      2.84x      2.49x      2.55x*
</TABLE>

<TABLE>
<CAPTION>
                                                                      AT DECEMBER 31,
                                                    ----------------------------------------------------
                                                         UNAUDITED
                                                    -------------------                                    UNAUDITED
                                                      1995       1996       1997       1998       1999     AT 9/30/00
                                                    --------   --------   --------   --------   --------   ----------
                                                             (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA
  Total assets....................................   $2,586     $2,698     $2,806     $2,928     $3,049      $2,626
  Long-term debt..................................      617        633        653        698        619         394
  Preferred shares subject to mandatory
    redemption, at stated value...................       --         65         65         65         65          65
  Preferred shares, at stated value...............      101         58         58         58         58          58
  Common shareholders' equity.....................      945        971      1,012      1,089      1,009       1,032
  Cash dividends per common share.................     0.80       0.80       0.80       0.80       0.80        0.60
  Book value per share............................     8.65       8.89       9.24       9.88       9.56        9.76
  Average basic common shares outstanding
    (millions)....................................      108        109        109        110        110         110
</TABLE>

--------------------------
* Calculated for twelve months ended September 30, 2000.

                                       26
<PAGE>
       SELECTED UNAUDITED PRO FORMA CONDENSED CONSOLIDATED FINANCIAL DATA
                           OF TOUCH AMERICA HOLDINGS

    The following selected unaudited pro forma condensed consolidated financial
information gives effect to the approvals of the proposed merger and sale of the
utility business to NorthWestern, as solicited in this proxy
statement/prospectus. In addition, this selected financial information
illustrates the effects of the pending and expected sale of Continental Energy
Services, Inc. and, for the year ended December 31, 1999 and the nine months
ended September 30, 2000, the redemption of preferred stock, solicited in this
proxy statement/prospectus, and the acquisition of certain divested businesses
of Qwest Communications International Inc. It does not present expected proceeds
and gains from the pending sales. The selected unaudited pro forma condensed
consolidated financial information is presented for illustrative purposes only.
You should not rely on this information as being indicative of the results of
operations or financial position that would have been achieved had the proposals
solicited in this proxy statement/prospectus occurred at the beginning of each
of the periods or on the date indicated, or the future results that Touch
America Holdings will experience after the restructuring. The selected unaudited
pro forma condensed consolidated financial information (i) has been derived from
and should be read in conjunction with the "Unaudited Pro Forma Consolidated
Financial Statements of Touch America Holdings" and the related notes included
below on page 59 and (ii) should be read in conjunction with the consolidated
financial statements of MPC. See "Index to Financial Statements" below on
page F-1. For a chart on Touch America Holdings after the restructuring is
completed, see page 15 above.

<TABLE>
<CAPTION>
                                                                       FOR THE YEAR ENDED
                                                ----------------------------------------------------------------
                                                                    DECEMBER 31,
                                                ----------------------------------------------------   UNAUDITED
                                                12/31/95   12/31/96   12/31/97   12/31/98   12/31/99   09/30/00
                                                --------   --------   --------   --------   --------   ---------
                                                        (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>
UNAUDITED PRO FORMA STATEMENT OF OPERATIONS
  DATA
  Operating revenues..........................   $  27      $  30      $   48     $ 100      $ 387       $ 331
  Operating expenses..........................      34         40          49        64        313         276
  Operating income (loss).....................      (7)       (10)         (1)       36         74          55
  Net income (loss) from continuing operations
    for common shares.........................     (13)       (17)         (1)       14         45          33
  Basic net income (loss) from continuing
    operations per common share...............   (0.12)     (0.15)      (0.01)     0.13       0.41        0.31
  Diluted net income from continuing
    operations per common share...............   (0.12)     (0.15)      (0.01)     0.13       0.41        0.31

<CAPTION>
                                                                  AT DECEMBER 31,
                                                ----------------------------------------------------   UNAUDITED
                                                  1995       1996       1997       1998       1999     AT 9/30/00
                                                --------   --------   --------   --------   --------   ----------
                                                         (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
UNAUDITED PRO FORMA BALANCE SHEET DATA
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>
  Assets relating to telecommunications
    operations................................   $  23      $  52      $  102     $ 190      $ 291       $ 752
  Long-term debt, excluding debt to be assumed
    by NorthWestern...........................     243        259         279       324        245          97
  Preferred shares subject to mandatory
    redemption................................      --         --          --        --         --          --
  Preferred shares, at stated value...........     101         58          58        58         36          36
  Common shareholders' equity.................     945        971       1,012     1,089      1,009       1,032
  Cash dividends per common share from
    telecommunications operations.............      --         --          --        --         --          --
  Book value per share........................    8.65       8.89        9.24      9.88       9.56        9.76
  Average common shares outstanding
    (millions)................................     108        109         109       110        110         110
</TABLE>

                                       27
<PAGE>
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    This proxy statement/prospectus and the documents that are incorporated
herein by reference include various forward-looking statements about MPC and
Touch America Holdings that are subject to risks and uncertainties.
Forward-looking statements include the information concerning future financial
performance, business strategy, projected plans and objectives of MPC and Touch
America Holdings set forth under:

    - "Questions and Answers About the Restructuring";

    - "Summary";

    - "Selected Unaudited Pro Forma Consolidated Financial Data";

    - "Comparative Per Share Data";

    - "The Restructuring";

    - "The Merger Agreement";

    - "The Purchase Agreement; and

    - "Unaudited Pro Forma Condensed Consolidated Financial Statements--Touch
      America Holdings".

    Statements preceded by, followed by or that otherwise include the words
"believes," "expects," "anticipates," "intends," "estimates," "plans" or similar
expressions are generally forward-looking in nature and not historical facts.

    In addition to the certain factors described under "Certain Factors Relating
to the Restructuring," the following important factors could cause actual future
results for MPC and Touch America Holdings to differ materially from those
expressed in the forward-looking statements:

    - changes in economic conditions;

    - changes in laws, regulations or regulatory policies;

    - developments in legal or public policy doctrines;

    - technological developments;

    - an inability to consummate the redemption of preferred stock, the merger
      or the sale of the utility business to NorthWestern;

    - potential changes in the applicable accounting standards for the
      restructuring;

    - the risk of a significant delay in the expected completion of, and
      unexpected consequences resulting from, the restructuring; and

    - any other presently unknown or unforeseen factors.

    Most of these factors are difficult to accurately predict and are generally
beyond the control of MPC and Touch America Holdings.

    The areas of risk described above should be considered in connection with
any written or oral forward-looking statements that may be made after the date
of this proxy statement/prospectus by MPC or Touch America Holdings or anyone
acting for them. Except for their ongoing obligations to disclose material
information under the federal securities laws, neither MPC nor Touch America
Holdings undertake any obligation to release publicly any revisions to any
forward-looking statements to report events or circumstances after the date of
this proxy statement/prospectus or the occurrence of unanticipated events.

                                       28
<PAGE>
                              THE SPECIAL MEETING

    WE ARE FURNISHING THIS PROXY STATEMENT/PROSPECTUS TO SHAREHOLDERS OF MPC AS
PART OF THE SOLICITATION OF PROXIES BY THE MPC BOARD FOR USE AT THE SPECIAL
MEETING.

DATE, TIME AND PLACE

    MPC will hold its special meeting on [      ], 2001, at 1:30 p.m., local
time, at the Mother Lode Theater, 316 W. Park, Butte, Montana.

PURPOSE OF THE SPECIAL MEETING

    At the special meeting, we are asking holders of record of MPC's common
shares and preferred shares to consider and vote on (i) a proposal to approve
the merger agreement between MPC, Touch America Holdings and The Montana Power
L.L.C. and (ii) a proposal to approve the sale of the utility business to
NorthWestern. See "The Restructuring," below on page 32, "The Merger Agreement"
below on page 49 and "The Purchase Agreement" below on page 50. We are also
asking holders of record of MPC's common shares to consider and vote on a
proposal to approve the redemption of MPC's outstanding Preferred Stock, $4.20
Series and Preferred Stock, $6.00 Series. See "The Restructuring" below on
page 32 and "The Redemption of the Preferred Stock" below on page 58.

    The members of the MPC Board present at the September 29, 2000 and the
October 24, 2000 MPC Board meetings unanimously approved and adopted the merger
agreement, the purchase agreement and the other transactions contemplated by the
merger agreement and the purchase agreement, and unanimously approved the
redemption of the preferred stock. The MPC Board has determined that these
transactions and the restructuring envisioned is consistent with, and in
furtherance of, the best interest of MPC and its shareholders.

    MEMBERS OF THE MPC BOARD PRESENT AT THE SEPTEMBER 29, 2000 AND THE OCTOBER
24, 2000 BOARD MEETINGS UNANIMOUSLY RECOMMEND THAT MPC'S SHAREHOLDERS VOTE FOR
THE APPROVAL OF THE MERGER AGREEMENT, THE SALE OF THE UTILITY BUSINESS TO
NORTHWESTERN AND THE REDEMPTION OF THE PREFERRED STOCK.

RECORD DATE; SHARES ENTITLED TO VOTE; QUORUM

    Only MPC's shareholders of record at the close of business on [  ], 2001,
the record date, are entitled to notice of and to vote at the special meeting.
On [      ], 2001,       MPC common shares were issued and outstanding and held
by approximately [      ] holders of record and approximately 580,389 MPC
preferred shares were issued and outstanding and held by approximately [  ]
holders of record. A quorum will be present at the special meeting if the
holders of a majority of the votes of shares entitled to vote on the record date
are represented in person or by proxy. If a quorum is not present at the special
meeting, we expect that the special meeting will be adjourned or postponed to
solicit additional proxies. Holders of record of MPC common shares and MPC
preferred shares on the record date are entitled to one vote per share at the
special meeting on the proposal to approve the merger agreement and the sale of
the utility business to NorthWestern, while holders of record of MPC common
shares on the record date are entitled to one vote per share at the special
meeting on the proposal to approve the redemption of the preferred stock.

VOTE REQUIRED

    The approval of (i) the merger agreement, and (ii) the sale of the utility
business to NorthWestern, by the holders of record of MPC shares requires the
affirmative vote of at least two-thirds of the shares

                                       29
<PAGE>
outstanding and entitled to vote at the special meeting of the shareholders as
of the record date, either in person or by proxy, voting as a single class. The
approval of the redemption of the preferred stock requires the affirmative vote
of at least a majority of the common shares outstanding and entitled to vote at
the special meeting of the shareholders as of the record date, either in person
or by proxy, voting as a single class.

VOTING BY MPC DIRECTORS AND EXECUTIVE OFFICERS

    At the close of business on October 31, 2000, directors and executive
officers of MPC owned and were entitled to vote less than 1% of MPC common
shares outstanding on that date. Each MPC director and executive officer has
indicated his or her present intention to vote, or cause to be voted, MPC common
shares owned by him or her for the approval of the merger agreement, the sale of
the utility business to NorthWestern and the redemption of the preferred stock.

VOTING OF PROXIES

    All shares represented by properly executed proxies received in time for the
special meeting will be voted at the special meeting in the manner specified by
the shareholders giving those proxies. Properly executed proxies that do not
contain voting instructions will be voted for the approval of the merger
agreement, sale of the utility business to NorthWestern and the redemption of
the preferred stock.

    In addition to manually executing and returning a proxy by mail,
shareholders may vote by telephone or computer. If voting by telephone or
computer, the shareholder should dial the toll-free number or access the
Internet address, in each case as indicated in the shareholder's proxy. The
shareholders will then be prompted to enter the control number printed on the
proxy and to follow the subsequent instructions.

    MPC shares represented at the special meeting but not voting, including MPC
shares for which proxies have been received but for which holders of shares have
abstained, will be treated as present at the special meeting for purposes of
determining the presence or absence of a quorum for the transaction of all
business.

    Only shares affirmatively voted for the approval of the merger agreement,
the sale of the utility business to NorthWestern and the redemption of the
preferred stock, including properly executed proxies that do not contain voting
instructions, will be counted as favorable votes for the proposal. AN ABSTENTION
OR FAILURE TO VOTE WILL HAVE THE SAME EFFECT AS A VOTE AGAINST APPROVAL OF THE
MERGER AGREEMENT, THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN AND THE
REDEMPTION OF THE PREFERRED STOCK. Also, under New York Stock Exchange and
Pacific Exchange, Inc. rules, brokers who hold MPC shares in street name for
customers who are the beneficial owners of those shares may not give a proxy to
vote those shares without specific instructions from those customers. If a
shareholder owns shares through a broker and intends to come to the special
meeting and vote, the shareholder must bring a letter from his or her broker
identifying him or her as the beneficial owner of the shares and authorizing the
shareholder to vote.

    On October 24, 2000, the MPC Board appointed Jerrold P. Pederson, Michael E.
Zimmerman and Robert P. Gannon as the persons to vote the proxies for the
shareholders at the special meeting. The persons named as proxies by a
shareholder may propose and vote for one or more adjournments of the special
meeting, including adjournments to permit further solicitations of proxies. No
proxy voted against the proposal to approve the merger agreement, the sale of
the utility business to NorthWestern or the redemption of the preferred stock
will be voted in favor of any adjournment or postponement.

    MPC does not expect that any matter other than the proposals to approve the
merger agreement, the sale of the utility business to NorthWestern and the
redemption of the preferred stock will be

                                       30
<PAGE>
brought before the special meeting. If, however, other matters are properly
presented to the meeting, the persons named as proxies will vote in accordance
with the recommendation of the MPC Board.

REVOCABILITY OF PROXIES

    Voting by use of a proxy on the enclosed form, telephone or computer does
not preclude a shareholder from voting in person at the special meeting. A
shareholder may revoke a proxy at any time prior to its exercise by filing with
MPC a duly executed revocation of proxy, by submitting a duly executed proxy,
telephone or computer vote to MPC with a later date or by appearing at the
special meeting and voting in person. Shareholders may revoke a proxy by any of
these methods, regardless of the method used to cast his or her previous vote.
Attendance at the special meeting without voting will not itself revoke a proxy.

SOLICITATION OF PROXIES

    MPC will mail a copy of this proxy statement/prospectus to each holder of
record of MPC shares on the record date. We have selected Corporate Investor
Communications, Inc. to assist in the solicitation of proxies for a fee of
$10,000 plus expenses. Solicitations will be made by mail and may also be made
by our officers, or by other regular employees, or by employees of Corporate
Investor Communications, Inc. personally, by telephone or by other electronic
means. We also will request that brokers and other nominees solicit proxies or
authorizations from shareholders whose shares are held in accounts (street name)
at brokerage firms. In addition, we will pay the customary broker or nominee
charges for forwarding proxy materials to you. MPC will bear the cost of the
solicitation of proxies from its shareholders.

    SHAREHOLDERS WILL NOT BE REQUIRED TO EXCHANGE THEIR MPC SHARE CERTIFICATES
AS A RESULT OF THE MERGER. YOUR EXISTING MPC SHARE CERTIFICATES WILL
AUTOMATICALLY BECOME SHARE CERTIFICATES OF TOUCH AMERICA HOLDINGS. ACCORDINGLY,
MPC SHAREHOLDERS SHOULD NOT SEND IN THEIR MPC SHARE CERTIFICATES.

                                       31
<PAGE>
                               THE RESTRUCTURING

    THE DISCUSSION IN THIS PROXY STATEMENT/PROSPECTUS OF THE RESTRUCTURING, THE
PRINCIPAL TERMS OF THE PURCHASE AGREEMENT DATED AS OF SEPTEMBER 29, 2000, AMONG
MPC, TOUCH AMERICA HOLDINGS AND NORTHWESTERN, AND THE PRINCIPAL TERMS OF THE
MERGER AGREEMENT DATED AS OF DECEMBER 15, 2000, AMONG MPC, THE MONTANA POWER
L.L.C. AND TOUCH AMERICA HOLDINGS, IS SUBJECT TO, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO THE MERGER AGREEMENT AND THE PURCHASE AGREEMENT. COPIES
OF THESE AGREEMENTS ARE ATTACHED TO THIS PROXY STATEMENT/PROSPECTUS AS ANNEX A
AND B, RESPECTIVELY, AND ARE INCORPORATED HEREIN BY REFERENCE.

GENERAL DESCRIPTION OF THE RESTRUCTURING

    In the restructuring, MPC will merge with and into The Montana Power L.L.C.,
a Montana limited liability company and wholly-owned subsidiary of Touch America
Holdings. Pursuant to the merger agreement, shareholders of MPC will become
shareholders of Touch America Holdings. Immediately following the merger, The
Montana Power L.L.C. (constituting MPC's utility business) will be sold to
NorthWestern. As a result of these transactions, Touch America Holdings will
become the owner of the telecommunications operating businesses of Touch
America, Inc. and Tetragenics Company.

BACKGROUND OF THE RESTRUCTURING

    MPC was formed in 1912 through the merger of four small regional electric
companies. Through an evolutionary expansion into related businesses, as of the
beginning of this year, MPC operated or invested in businesses in North America,
Europe and Asia, supplying energy--non-regulated electricity, natural gas, oil
and coal--and providing energy and telecommunications services.

    MPC's utility business in the western two-thirds of Montana is transmission
and distribution of electricity and natural gas, serving 285,000 electric
customers and 148,000 natural gas customers. Its nonutility businesses were
primarily natural gas exploration, production and marketing, coal mining, and an
independent power group, which developed, owned and operated nonutility electric
generation facilities.

    In recent years, MPC's growth business has been focused around Touch
America, Inc., its telecommunications subsidiary. Presently, Touch
America, Inc. has a 18,000-mile fiber-optic network in the United States and has
plans to expand that network to 23,000 miles by 2001. The divestiture would
allow a sharper focus on this telecommunications business.

    Given the tremendous growth in the telecommunications industry generally,
and Touch America, Inc. specifically, earlier this year MPC began considering a
restructuring of its businesses to focus on the telecommunications business. On
March 28, 2000, after a careful review of options and strategies, MPC announced
that it would begin the process of divesting MPC's multiple energy businesses,
separating them from Touch America, Inc. and Tetragenics. It was MPC's intent to
exit the energy businesses quickly in order to create a clear vision for the
future and to focus on Touch America, Inc.

    The decision to divest the energy businesses of MPC was based on a belief
that the divestiture would allow a focus on the fast-growing telecommunications
business of Touch America, Inc., while enabling the energy companies to grow,
thrive and add value under new ownership. The MPC Board focused on the fact that
MPC's structure, which had been created to be responsive to the demands of a
regulated intrastate utility business, could not continue to meet the demands
and ensure the success of both the energy and telecommunications businesses,
which are very different.

                                       32
<PAGE>
    Consequently, MPC retained Goldman, Sachs & Co. to assist it in the sale of
the utility business, the coal business, the oil and gas business and the
independent power production business, as well as the restructuring of MPC from
an energy related business to Touch America Holdings, a telecommunications
business with a simple corporate structure more appropriate to a national
telecommunications holding company. With the assistance of Goldman, Sachs & Co.,
MPC entered into an auction process to determine all qualified buyers for the
various businesses. In determining a buyer, the MPC Board was particularly
focused on achieving strong prices from well-regarded companies with good
reputations for integrity, community involvement and fair treatment of all
employees. Following a vigorous auction and bidding process, MPC rapidly entered
into agreements with third parties to divest itself of the coal business, the
oil and gas business and the independent power production business.

    On August 28, 2000, MPC announced that PanCanadian Petroleum Limited of
Calgary had agreed to acquire the oil and gas business for $475 million in cash.
PanCanadian Petroleum Limited is one of Canada's largest producers and marketers
of crude oil, natural gas and gas liquids. MPC believes that there will be a
meshing of business strategies and cultural synergies between PanCanadian
Petroleum Limited and the oil and gas business. The sale of the oil and gas
business was completed on October 31, 2000. PanCanadian Petroleum Limited is
contractually committed to continue total compensation levels to all current
employees of MPC in the oil and gas business until October 31, 2002 and to
provide enhanced severance benefits to any employee terminated during that
period.

    On September 15, 2000, MPC announced that Westmoreland Coal Company had
agreed to acquire the coal business for $138 million in cash. The sale of the
coal business is expected to be completed in March 2001. Westmoreland Coal
Company is contractually committed to continue total compensation levels to all
current employees of MPC in the coal business until twenty-four months following
the completion of the sale of the coal business and to provide enhanced
severance benefits to any employee terminated during that period.

    On September 20, 2000, MPC announced that privately held BBI Power
Corporation had agreed to acquire the independent power production business for
$85 million in cash. The sale of the independent power production business was
completed on [              ]. BBI Power Corporation is contractually committed
to continue total compensation levels to all current employees of MPC in the
independent power production business until twenty-four months following the
completion of the sale of the independent power production business and to
provide enhanced severance benefits to any employee terminated during that
period. In addition, BBI Power Corporation has agreed to keep the headquarters
of the independent power production business in Butte, Montana, and continue
with the 500-megawatt, gas-fired, combined cycle power plant proposed for the
Silicon Mountain Technology Park just west of Butte.

    Following the announcement of these transactions, and in preparation for the
sale of the utility business to NorthWestern, on September 26, 2000, MPC
announced the formation of a stand-alone transition organization to assist MPC
with the divestiture of the utility business. The leadership group will provide
NorthWestern with an experienced team to lead the utility business into the
future, and to reassure MPC's customers and the public that a ready, willing and
able organization will continue to provide safe and reliable electric and
natural gas service to the more than 300,000 customers in Montana.

    On October 2, 2000, MPC announced that NorthWestern had agreed to acquire
the utility business for approximately $1.1 billion, including the assumption of
up to $488 million of debt. NorthWestern is an energy and communications company
with $5 billion in annual revenues and a long history of providing electric and
natural gas service to customers in South Dakota and Nebraska. The agreement
entered into with NorthWestern is described under the heading "The Purchase
Agreement" below on page 50. This agreement, and the sale of the utility
business to NorthWestern thereunder, was unanimously approved by the MPC Board
on September 29, 2000.

                                       33
<PAGE>
    In connection with the sale of the utility business to NorthWestern, and the
restructuring generally, the MPC Board met on October 24, 2000, and those
members present unanimously approved and adopted the merger agreement and the
redemption of the preferred stock and recommended that MPC's shareholders
approve the merger agreement, the sale of the utility business to NorthWestern
and the redemption of the preferred stock. In addition, the members of the MPC
Board present at this meeting unanimously approved a tender offer for all of the
outstanding shares of MPC's $6.875 Series Preferred Stock.

    Following the merger and the sale of the utility business to NorthWestern,
the cash proceeds of the sale of the oil and gas business, the coal business,
the independent power production business and the utility business, totaling
approximately $1.3 billion, is to be re-deployed to take advantage of Touch
America, Inc.'s multiple telecommunications opportunities.

REASONS FOR THE RESTRUCTURING AND THE MPC BOARD RECOMMENDATION

    At its meetings on September 29, 2000 (regarding the sale of the utility
business to NorthWestern) and October 24, 2000 (regarding the restructuring, the
merger and the redemption of the preferred stock), after due consideration, the
members of the MPC Board present unanimously:

    - determined that the restructuring is consistent with, and in furtherance
      of, the best interest of MPC and its shareholders;

    - determined that the sale of the utility business to NorthWestern and the
      other transactions contemplated by the purchase agreement are consistent
      with, and in furtherance of, the best interest of MPC and its
      shareholders;

    - adopted and approved the purchase agreement and the other transactions
      contemplated by the purchase agreement;

    - determined that the merger is consistent with, and in furtherance of, the
      best interest of MPC and its shareholders;

    - adopted and approved the merger agreement and the other transactions
      contemplated by the merger agreement;

    - determined to recommend that MPC shareholders vote for the approval of the
      merger agreement and the sale of the utility business to NorthWestern;

    - determined that the redemption of the preferred stock is consistent with,
      and in furtherance of, the best interest of MPC and it shareholders; and

    - adopted and approved the redemption and determined to recommend that MPC
      shareholders vote for the approval of the redemption of the preferred
      stock.

    The decision to divest the energy businesses of MPC was based on a belief
that the divestiture would allow a focus on the fast-growing telecommunications
business of Touch America, Inc., while enabling the energy companies to grow,
thrive and add value under new ownership.

    The MPC Board found that the management demands of operating a regulated,
integrated electric and natural gas utility company are very different from
those of operating a national, growth oriented fiber optic telecommunications
company, and that these differing demands are such that separate ownership and
management of the businesses will be far more efficient. The MPC Board
determined that the complete attention of MPC's management team was needed in
order to continue to aggressively grow Touch America, Inc.'s national
fiber-optic and wireless networks, including increasing traffic and revenues and
building brand awareness. In the rapidly-changing telecommunications business
climate, opportunities must be acted upon with urgency, requiring corporate
structures that are focused and less complicated than MPC's present structure.
The MPC Board also believed that the realities of

                                       34
<PAGE>
size and scale in the energy and telecom business could not be ignored. Without
the separation of the energy and the telecommunications businesses, the MPC
Board believed that the whole of MPC would become less than the sum of the
parts, adversely affecting MPC's employees, customers, communities and
shareholders.

    The MPC Board believes that the combination of Touch America Holdings'
management, personnel, technical expertise and financial strength, will create a
company with capabilities and resources better positioned to succeed and grow in
the competitive telecommunications marketplace.

    The MPC Board believes that the redemption of the preferred stock will allow
Touch America Holdings to have a more transparent equity structure in line with
other national, growth oriented telecommunication companies. This structure will
allow a proper valuation of Touch America Holdings, and provide the shareholders
of Touch America Holdings' common shares with greater voting power.

    The MPC Board is of the opinion that the restructuring will provide
substantial financial benefits to MPC shareholders, employees and customers. The
restructuring is expected to provide Touch America Holdings with the size,
resources and large customer base necessary for achieving competitive investor
returns in the telecommunications industry.

    In approving the transaction and making these determinations and
recommendations, the MPC Board consulted with Company management as well as its
outside legal counsel and financial advisors, and considered a number of
factors, including the following factors:

    - the benefits of the transactions described above;

    - the review and analysis of MPC's and Touch America, Inc.'s business,
      financial condition, earnings, risks and prospects;

    - the effect of the transaction on the capital structure and financial
      ratios of MPC;

    - the possibility that the transaction could result in a lower investment
      grade credit rating for Touch America Holdings than for MPC;

    - current industry, economic and market conditions and the prospects of
      further restructuring and consolidation in the telecommunications
      industry;

    - the risks of completing the sale of the coal, independent power production
      and oil and gas businesses and the utility business;

    - the ability to complete the merger as a tax-free transaction for U.S.
      federal income tax purposes and to have the exchange of MPC shares be
      tax-free to shareholders;

    - the terms and conditions of the purchase agreement, including the
      conditions to closing, the potential termination fees payable, the amount
      of the consideration, and the fact that the consideration is all in cash;

    - the proposed composition of senior management and the Board of Directors
      of Touch America Holdings;

    - the potential benefits to the employees of MPC's energy businesses from
      the expanded opportunities that are anticipated to be available under new
      ownership intent on growing those businesses;

    - the interests of MPC's customers;

    - that while the transaction is likely to be completed, there are risks
      associated with obtaining necessary regulatory approvals, and as a result
      of this and other conditions to the completion of the transaction, it is
      possible that the transaction may not be completed even if approved by
      shareholders;

                                       35
<PAGE>
    - the impact of regulation of the energy businesses under the state of
      Montana and federal laws;

    - the risks inherent in the telecommunications industry; and

    - the interests that certain executive officers of MPC may have with respect
      to the transaction in addition to their interests as shareholders of MPC.

    The MPC Board believes that, overall, the potential benefits of the merger,
the sale of the utility business to Northwestern, and the restructuring
generally, to MPC and its shareholders outweighed the risks.

    This discussion of the information and factors considered by the MPC Board
in making its decision is not intended to be exhaustive but includes all
material factors considered by the MPC Board. In view of the wide variety of
factors considered in connection with its evaluation of the transaction and the
complexity of these matters, the MPC Board did not find it useful to and did not
attempt to quantify, rank or otherwise assign relative weights to these factors.
In addition, the MPC Board did not undertake to make any specific determination
as to whether any particular factor, or any aspect of any particular factor, was
favorable or unfavorable to its ultimate determination, but rather the MPC Board
conducted an overall analysis of the factors described above, including thorough
discussions with and questioning of MPC's management and legal, financial and
accounting advisors. In addition, individual members of the MPC Board may have
given different weight to different factors.

USE OF PROCEEDS FROM THE SALE OF THE ENERGY BUSINESSES

    The sale of the utility business to NorthWestern is anticipated to result in
Touch America Holdings receiving approximately $602 million in cash. In
addition, NorthWestern will assume all of MPC's outstanding debt in the amount
of up to $488 million. The sale of the oil and gas business, the coal business
and the independent power production business is anticipated to result in Touch
America Holdings receiving approximately an additional $698 million in cash.
From these proceeds, MPC will pay various restructuring-related costs, including
estimated legal, advisory and banking costs of approximately 2.5% of these cash
proceeds and will pay Federal and state income taxes on such proceeds.

    Touch America Holdings plans to use the proceeds from these sales primarily
for working capital purposes and to provide capital in positioning Touch
America, Inc. in the business of telecommunications.

    THE MPC BOARD RECOMMENDS THAT MPC'S SHAREHOLDERS VOTE FOR THE APPROVAL OF
THE MERGER AGREEMENT, THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN AND THE
REDEMPTION OF THE PREFERRED STOCK.

INTERESTS OF MPC'S DIRECTORS AND MANAGEMENT IN THE RESTRUCTURING

    At the completion of the restructuring, Touch America Holdings' Board of
Directors will consist of the following individuals: Robert P. Gannon, Jerrold
P. Pederson, Tucker Hart Adams, Adam F. Cain, John G. Connors, R.D. Corette, Kay
Foster, John R. Jester, Carl Lehrkind III, Deborah D. McWhinney and Noble E.
Vosburg. The following officers of MPC and Touch America, Inc. will be officers
of Touch America Holdings: Robert P. Gannon, Jerrold P. Pederson, Michael J.
Meldahl, Patrick T. Fleming, and Rose Marie Ralph. Robert P. Gannon, currently
the Chairman and Chief Executive Officer of MPC, will continue as Chairman and
Chief Executive Officer of Touch America Holdings.

                                       36
<PAGE>
OUTSTANDING STOCK-BASED GRANTS UNDER MPC'S LONG-TERM INCENTIVE PLAN

    MPC's employees and executive officers participate in MPC's Long-Term
Incentive Plan. The Plan permits the granting of stock options, stock
appreciation rights, restricted stock, performance shares and dividend
equivalent shares and contains a "change of control" provision applicable to
awards made on or after May 11, 1999 unless otherwise provided in the applicable
award agreement. The consummation of the restructuring will constitute a change
of control for purposes of the Plan. Pursuant to the Plan's terms, upon a change
of control:

    - Stock options granted after May 11, 1999 but before August 21, 2000 then
      unexercised and outstanding will become fully vested and exercisable in
      accordance with the terms and conditions of the Plan and the applicable
      stock option award agreement, and

    - All restrictions, terms and conditions applicable to all restricted stock
      then outstanding will be deemed lapsed and satisfied.

    Stock options granted prior to May 12, 1999 are all fully vested and
exercisable.

CHANGE OF CONTROL AGREEMENTS

    MPC has entered into individual severance benefit agreements with 36 of its
employees to provide benefits under certain circumstances after a change of
control of MPC, if their employment is subsequently terminated without "cause"
(as defined in such agreements) by MPC or with "good reason" (as defined in such
agreements) by the employee.

    There are three different tiers of these agreements. The agreements provide
that if, within three years after the occurrence of a change of control (as
defined in the agreement), the employee is terminated by MPC without cause (as
defined in the agreement), or the employee terminates employment with MPC for
good reason (as defined in the agreement), the employee is entitled to
(i) 299.9 percent for a "Tier 1" participant, 200 percent for a "Tier 2"
participant and 100 percent for a "Tier 3" participant of the sum of the highest
annual rate of base salary paid to the employee during the three-year period
immediately preceding the change of control and the highest annual bonus paid to
such individual during such three-year period, (ii) 200 percent of the annual
contribution to the employee's cash balance pension plan, (iii) the present
value of the cost to provide welfare benefits under MPC's life insurance,
health, dental, disability and other welfare plans for a period of three years
following termination, and (iv) a prorated portion of the target annual bonus in
the year in which the change of control occurred.

    In addition, in the event that any amounts paid to a Tier 1 participant
under his or her agreement, or otherwise in connection with his or her
termination, are subject to the excise tax imposed under the Internal Revenue
Code of 1986, as amended, in connection with a change of control, MPC shall pay
an additional amount (the "Gross-Up Payment") equal to the amount of any such
excise taxes and any state or federal taxes on the Gross-Up Payment.

    The Tier 2 and Tier 3 agreements address the situation where the amounts
paid under his or her agreement, or otherwise in connection with his or her
termination, would be subject to the excise tax imposed under the Internal
Revenue Code of 1986, as amended, in connection with the change of control. If
such payments or benefits less such excise tax are less than the maximum amount
of the payments or benefits which could otherwise be payable to the individual
without the imposition of the excise tax, then, to the extent necessary to
eliminate the imposition of the excise tax (a) such cash payment and benefits
shall first be reduced (if necessary, to zero) and (b) all other non-cash
payments and benefits shall not be reduced.

                                       37
<PAGE>
    MPC has entered into Tier 1 agreements with Messrs. Cromer, Gannon, Haffey,
Meldahl and Pederson and three other executive officers of MPC. In addition, MPC
has entered into Tier 2 agreements with five individuals and Tier 3 agreements
with 23 individuals.

    Pursuant to their Tier 1 agreements, Messrs. Cromer, Gannon, Haffey, Meldahl
and Pederson would be entitled to payments of approximately $2,225,957,
$4,727,275, $2,122,567, $2,621,422 and $2,187,839, respectively (based on
estimates prepared using the current data) in the event their respective
employment is terminated in connection with, or within 36 months following, the
change of control (as defined in the agreement). The three other executive
officers who are party to a Tier 1 agreement with MPC would be entitled to an
aggregate payment of approximately $4,234,084 if the employment of each such
individual were to be terminated in connection with, or within 36 months
following, the change of control (as defined in the agreement). The five
individuals who are party to a Tier 2 agreement would be entitled to an
aggregate payment of approximately $2,351,163 if the employment of each such
individual were to be terminated in connection with, or within 36 months
following, the restructuring. In addition, the 23 individuals who are party to a
Tier 3 agreement with MPC would be entitled to an aggregate payment of
approximately $4,226,204 if the employment of each such individual were to be
terminated in connection with, or within 36 months following, the change of
control (as defined in the agreement).

    Pursuant to the terms of the purchase agreement, NorthWestern has agreed to
honor these individual change of control severance agreements and to assume all
liability for any amounts or benefits due thereunder. However, NorthWestern will
not assume the obligations under the individual change of control severance
agreement of any employee of MPC who is an employee of Touch America, Inc. prior
to the restructuring or who transfers to Touch America, Inc. in connection with
the restructuring. It is anticipated that Messrs. Gannon, Meldahl and Pederson,
as well as one additional holder of a Tier 1 agreement, one holder of a Tier 2
agreement and 13 holders of Tier 3 agreements will be employed by Touch
America, Inc. following the restructuring. Touch America, Inc. will assume the
obligations of MPC pursuant to the individual change of control severance
agreements with respect to such employees. The transfer of these employees to
Touch America, Inc. will not constitute a termination of their employment for
purposes of these individual change of control severance agreements.

EMPLOYEE BENEFIT PLANS

    During the period from the sale of the utility business to NorthWestern
until twenty-four months following the sale of the utility business to
NorthWestern, NorthWestern has agreed to maintain base salary, wages,
compensation levels and employee pension and welfare benefit plans and programs
for the benefit of the employees of the utility business, which, in the
aggregate, are at least equal to, or equivalent in value to, the base salary,
wages, compensation levels, and benefit plans provided to employees of the
utility business on the date of the purchase agreement, plus any base salary and
wage adjustments made in the ordinary course of business between the date of the
purchase agreement and the sale of the utility business to NorthWestern.

    If the employment of any employee of the utility business is terminated
within twenty-four months after the sale of the utility business to NorthWestern
by

    - action of NorthWestern or any of its affiliates other than for cause (as
      defined in the purchase agreement) or

    - action of an employee following (A) a reduction in such employee's base
      salary equal to or greater than fifteen percent or (B) such employee's
      decision not to relocate more than fifty miles from his or her then
      current job location,

                                       38
<PAGE>
then NorthWestern has agreed to pay each such employee a lump sum severance
benefit (less required tax withholding and other withholding obligations
required by applicable law) in an amount equal to the sum of (x) ten percent of
such employee's base salary multiplied by such employee's "years of service" up
to a maximum of one hundred percent of such base salary, plus (y) $6000.

    The bonus plans and other incentive compensation plans and programs of MPC
and/or any of its affiliates (or comparable cash equivalent plans) in which the
employees of the utility business are eligible to participate (including
terminated or retired employees who remain eligible to participate under the
terms of such plans), as in effect on the date of the purchase agreement, will
be maintained by NorthWestern through the end of the calendar year in which the
sale of the utility business to NorthWestern occurs with the bonuses and
incentive compensation to be paid thereunder by NorthWestern and/or its
affiliates determined

    - in accordance with calculation methods directed by Touch America Holdings
      such methods to be consistent with the terms of such incentive
      compensation plans in effect on the date of the purchase agreement and the
      utility business' past practices, as appropriate, and

    - in such a manner so that the effects of the transaction contemplated by
      the purchase agreement will not unduly burden or benefit the employees of
      the utility business.

    In addition, NorthWestern will provide each employee of the utility business
with credit for all prior service with MPC and its affiliates for all purposes
under each employee benefit plan, program, or arrangement of NorthWestern or its
affiliates in which such employee is eligible to participate, except to the
extent that such service credit would result in a duplication of benefits with
respect to the same period of service.

    NorthWestern has agreed to

    - waive all limitations as to preexisting conditions, exclusions and waiting
      periods with respect to participation and coverage requirements applicable
      to the covered participants and their covered dependents under any benefit
      plan, in which such covered participants and their covered dependents may
      be eligible to participate after the sale of the utility business to
      NorthWestern and

    - provide each covered participant and their covered dependents with credit
      for any co-payments and deductibles paid prior to the sale of the utility
      business to NorthWestern in satisfying any applicable deductible or
      out-of-pocket requirements under any benefit plan in which such covered
      participants and their covered dependents are eligible to participate
      after the sale of the utility business to NorthWestern.

    Effective as of the sale of the utility business to NorthWestern,
NorthWestern has agreed to sponsor and maintain MPC's 401(k) plan, or a
comparable plan for the eligible participants and beneficiaries (including
continuing the seller stock investment fund for the exclusive benefit of the
eligible participants and beneficiaries who had balances in such fund on the
sale of the utility business to NorthWestern) for at least twenty-four months
after the sale of the utility business to NorthWestern.

    Furthermore, as a condition to NorthWestern's obligation to purchase the
utility business, MPC has agreed that the employee stock ownership plan ("ESOP")
portion of MPC's 401(k) plan will either be terminated or transferred to Touch
America Holdings prior to the sale of the utility business to NorthWestern. The
ESOP trust for the 401(k) plan presently holds unallocated shares of MPC common
stock which it purchased with the proceeds of a loan from MPC. The loan from MPC
to the ESOP trust has not been paid in full. If the ESOP portion of the 401(k)
plan is terminated in connection with the restructuring, it is anticipated that
the ESOP trustee will sell a sufficient number of the unallocated ESOP trust
shares and to use the proceeds to repay the loan to MPC and that the remaining
unallocated shares held by the ESOP trust will be allocated to the participants
in MPC's 401(k) plan as

                                       39
<PAGE>
of October 31, 2000. MPC intends to apply to the Internal Revenue Service for
rulings and determinations with respect to the termination of the ESOP portion
of the 401(k) plan. If the ESOP portion of the plan is transferred to Touch
America Holdings, the employees of the utility business, as well as the other
businesses previously sold by MPC, will cease to participate in the ESOP portion
of the plan.

    For a discussion of the impact of the restructuring on the awards made to
employees under MPC's Long-Term Incentive Plan See "--Interests of MPC's
Directors and Management in the Restructuring" above on page 36 and
"--Outstanding Stock-Based Grants Under MPC's Long-Term Incentive Plan" above on
page 37.

    In addition, NorthWestern will maintain and shall be responsible for all
current and future obligations of the utility business with respect to

    - any post-retirement health or welfare benefit plan, program or arrangement
      maintained for all retirees and employees of the utility business as of
      the sale of the utility business to NorthWestern and

    - the utility discount provided to certain retired employees and certain
      other employees of the utility business. The post retirement health and
      welfare benefits described above shall be continued for their full terms
      as provided in the applicable plan, program or arrangement as in effect on
      the sale of the utility business to NorthWestern, and the utility discount
      described above shall be continued at least until residential customer
      choice for electric and natural gas utility service is fully implemented
      in Montana.

INDEMNIFICATION

    Under the purchase agreement, NorthWestern has agreed to indemnify the
directors, officers, employees and agents of Touch America Holdings against any
and all adverse consequences suffered, incurred or sustained by them relating to
MPC, The Montana Power L.L.C. and MPC's subsidiaries resulting from or arising
out of the operation of the business of MPC, The Montana Power L.L.C. and MPC's
subsidiaries following the sale of the utility to NorthWestern. The purchase
agreement also provides for certain additional indemnification obligations of
Touch America Holdings and NorthWestern. See "The Purchase
Agreement--Indemnification" below on page 57.

LISTING OF TOUCH AMERICA HOLDINGS' CAPITAL STOCK

    It is a condition to the completion of the merger that Touch America
Holdings' common stock issuable to MPC's shareholders pursuant to the merger
agreement be approved for listing on the New York Stock Exchange and the Pacific
Exchange, Inc., subject to official notice of issuance.

DIVIDENDS

    On October 24, 2000, the MPC Board voted to eliminate common dividend
payments effective the first quarter of 2001. The final quarterly dividend
declared by MPC was $.20 per share payable on November 1, 2000. However,
preferred dividends of MPC will not be affected by this decision.

    Following the restructuring and for the foreseeable future, Touch America
Holdings does not expect to pay dividends on its common stock.

MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES OF THE MERGER

    The following is a summary of the principal United States federal income tax
consequences of the merger to the shareholders of MPC. This summary is based on
the Internal Revenue Code of 1986, as amended, existing and proposed regulations
promulgated thereunder, and applicable judicial and

                                       40
<PAGE>
administrative determinations now in effect, all of which are subject to change
at any time. Any such changes may be retroactively applied in a manner that
could adversely affect shareholders.

    This summary does not discuss all of the tax consequences that may be
relevant to a shareholder of MPC in light of his or her particular
circumstances. It does not address the tax consequences to persons subject to
special rules, such as foreign persons, financial institutions, insurance
companies, dealers in securities or currencies, individual retirement and tax
deferred accounts, tax-exempt organizations, pass-through entities, persons who
engage in a straddle or hedge or conversion transaction, shareholders whose
"functional currency" is not the U.S. dollar, or shareholders who elect to
exercise dissenters' rights. In addition, this summary does not address the tax
consequences to holders of options issued under MPC's stock option plans or
other persons who have received their MPC stock as compensation.

    SHAREHOLDERS ARE ADVISED TO CONSULT WITH THEIR TAX ADVISORS AS TO THE TAX
CONSEQUENCES OF THE MERGER, INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL,
FOREIGN, AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN U.S. FEDERAL
OR OTHER TAX LAWS.

    MPC has requested a private letter ruling from the Internal Revenue Service
substantially to the effect that, on the basis of the facts, representations,
and assumptions existing on the date the merger is effective, the merger should
qualify as a tax-free reorganization pursuant to section 368(a)(1) of the
Internal Revenue Code of 1986, as amended. MPC has no assurance that the
requested ruling will be obtained or, if obtained, that the requested ruling
will be issued prior to the date of the merger.

    If the Internal Revenue Service has not issued the requested ruling prior to
the date of the merger, MPC will receive a tax opinion from Thelen Reid & Priest
LLP, special tax counsel to MPC, that the merger should qualify as a tax-free
reorganization. The tax opinion would be based upon certain qualifications and
assumptions and upon certain information, documentation, and other
representations of MPC, including an assumption that the value of Touch
America, Inc. is not less than one-third of the total value of MPC on the date
of the merger. The tax opinion would represent counsel's best legal judgment and
would not be binding on the Internal Revenue Service or the courts. There are no
regulations, published rulings, or judicial decisions directly on point with
respect to certain aspects of the merger. Accordingly, there can be no assurance
that the Internal Revenue Service or the courts would not take one or more
positions contrary to those expressed in the tax opinion.

    Assuming that the merger is treated as a reorganization for federal income
tax purposes, the following tax consequences will result:

    (1) no gain or loss will be recognized by MPC shareholders participating in
the merger on their receipt of Touch America Holdings' common stock in exchange
for MPC common stock or on their receipt of Touch America Holdings' preferred
stock in exchange for MPC preferred stock;

    (2) the tax basis of the Touch America Holdings' stock received by each MPC
shareholder in the merger will be the same as the tax basis of MPC stock
exchanged therefor;

    (3) the holding period of the Touch America Holdings' stock received by MPC
shareholders in the merger will include the holding period of MPC stock
exchanged therefor, provided that such MPC stock is held as a capital asset on
the date of the merger; and

    (4) no gain or loss will be recognized by MPC or Touch America Holdings as a
result of the merger.

                                       41
<PAGE>
    If it was determined that the merger is not a reorganization for federal
income tax purposes, the following tax consequences will likely result:

    (1) MPC shareholders participating in the merger will recognize gain or loss
on the receipt of Touch America Holdings' stock based on the difference between
the value of that stock on receipt and their adjusted tax basis in MPC stock
deemed exchanged therefor;

    (2) gain or loss recognized by MPC shareholders will be either long-term or
short-term capital gain or loss depending on whether the shareholders have held
their MPC stock for greater than one year, assuming such stock is held as a
capital asset. In the case of individuals, long-term capital gains are normally
subject to a reduced rate of tax. In the case of capital losses, there are
limitations on the ability to use such losses;

    (3) the holding period of the Touch America Holdings' stock will commence on
the date of acquisition of such stock and will not include the holding period of
the MPC stock deemed exchanged therefor; and

    (4) MPC will recognize gain or loss of the transfer of its assets and
liabilities to Touch America Holdings based on the difference between the value
it receives for such assets and its adjusted tax basis in the assets.

ACCOUNTING TREATMENT

    Touch America Holdings will record the sale of the utility business to
NorthWestern when the transaction is consummated. Touch America Holdings expects
to record a gain on this sale for the difference between the sales price less
the net book value of the assets and liabilities sold, net of transaction costs
and income taxes.

    Upon shareholder approval of the sale of the utility business to
NorthWestern, Touch America Holdings will account for the utility business as a
discontinued operation. Accordingly, Touch America Holdings will retroactively
report the results of operations from the utility business as discontinued
operations, net of tax for all periods presented. Touch America Holdings will
present the discontinued utility business operations on a net basis consistent
with generally accepted accounting principles requirements.

    Touch America Holdings will record the effects of the restructuring,
including the merger, using historical bases of assets and liabilities.

DISSENTERS' OR APPRAISAL RIGHTS

    AS A SHAREHOLDER, IF YOU PROPERLY FOLLOW CERTAIN PROCEDURES IN ACCORDANCE
WITH APPLICABLE PROVISIONS OF MONTANA LAW (SECTION 35-1-826 THROUGH 35-1-839),
YOU MAY DEMAND "DISSENTERS' RIGHTS" AND RECEIVE THE FAIR MARKET VALUE OF YOUR
SHARES IMMEDIATELY BEFORE THE COMPLETION OF THE RESTRUCTURING IN CASH. YOU WILL
RECEIVE SUCH CASH IN LIEU OF RECEIVING TOUCH AMERICA HOLDINGS' SHARES.

    To exercise these rights, you must:

    (1) deliver to MPC, BEFORE THE VOTE on [            ], 2001 to approve the
merger agreement and the sale of the utility business to NorthWestern, written
notice of intent to demand payment for your shares if the merger is effected and
the sale of the utility business to NorthWestern is completed; and

    (2) NOT VOTE IN FAVOR OF THE MERGER AGREEMENT AND THE SALE OF THE UTILITY
BUSINESS TO NORTHWESTERN. If you sign, date and mail your proxy card without

                                       42
<PAGE>
indicating how you want to vote, your proxy will be counted as a vote in favor
of the approval of the merger agreement and the sale of the utility business to
NorthWestern, since the MPC Board will vote properly executed blank proxy cards
in favor of approval of the merger and the sale of the utility business to
NorthWestern.

    If the merger agreement and the sale of the utility business to NorthWestern
are approved, then MPC will deliver a written dissenters' notice ("Dissenters'
Notice") to all shareholders who have previously satisfied the statutory
requirements listed above for exercising dissenters' rights. The Dissenters'
Notice must be sent by MPC within ten days after MPC shareholders approve the
restructuring, including the merger agreement and the sale of the utility
business to NorthWestern. The Dissenters' Notice must:

    (1) state where the payment demand must be sent and where and when
certificates for certified shares of holders demanding dissenters' rights must
be deposited;

    (2) inform shareholders of uncertificated shares for which dissenters'
rights have been demanded to what extent transfer of the shares will be
restricted after the payment is received;

    (3) supply a form for demanding payment which includes the date of the first
announcement to the news media or to shareholders of the terms of the merger
agreement and the sale of the utility business to NorthWestern and requires the
person asserting dissenters' rights to certify whether he or she acquired
beneficial ownership of the shares for which dissenters' rights are demanded
before that date;

    (4) set a date (not fewer than 30 or more than 60 days after the date the
Dissenters' Notice is delivered) by which MPC must receive the dissenting MPC's
shareholder's payment demand; and

    (5) be accompanied by a copy of the Montana Business Corporation Act
Sections 35-1-826 through 35-1-839.

If you exercise dissenters' rights, once you receive a Dissenters' Notice as
described above, you must within the time set forth in the Dissenters' Notice:

    (1) demand payment;

    (2) certify whether you acquired beneficial ownership of your shares for
which dissenters' rights are demanded before the date set forth in the
Dissenters' Notice; and

    (3) deposit your certificates in accordance with the terms of the
Dissenters' Notice.

    An MPC shareholder who demands payment and deposits his or her certificates
in accordance with the Dissenters' Notice and Montana law will retain all other
rights of an MPC shareholder until these rights are canceled or modified by the
consummation of the merger as provided in the merger agreement. A SHAREHOLDER
WHO DOES NOT DEMAND PAYMENT OR DEPOSIT HIS OR HER CERTIFICATES WHEN AND WHERE
REQUIRED, EACH BY THE DATE SET IN THE DISSENTERS' NOTICE, IS NOT ENTITLED TO
PAYMENT UNDER THE MONTANA BUSINESS CORPORATION ACT DISSENTERS' RIGHTS PROVISIONS
FOR HIS OR HER SHARES FOR WHICH DISSENTERS' RIGHTS ARE DEMANDED. In that event,
you will be deemed to receive Touch America Holdings' shares in lieu of cash for
your MPC shares.

    Except in the case of after-acquired shares, if the shareholders approve the
merger agreement and the sale of the utility business to NorthWestern, and upon
receipt of a payment demand as described above, MPC will pay to each dissenter
who has satisfied the statutory requirements, the amount that MPC estimates to
be the fair value of his or her shares for which dissenters' rights are
demanded, plus accrued interest.

                                       43
<PAGE>
    MPC's payment to each dissenting MPC shareholder will be accompanied by the
following:

    (1) MPC's balance sheet as of the end of a fiscal year ending not more than
16 months before the date the payment will be made, an income statement for that
year, a statement of changes in shareholder equity for that year and MPC's
latest available interim financial statements, if any;

    (2) a statement of MPC's estimate of the fair value of the shares for which
dissenter's right are demanded;

    (3) an explanation of how the interest paid to the dissenter was calculated;

    (4) a statement of dissenters' rights to demand payment if the dissenter
disagrees with MPC's assessment of the fair value of his or her shares for which
dissenters' rights are demanded under the appropriate Montana statutes; and

    (5) a copy of the Montana Business Corporation Act Sections 35-1-826 through
35-1-839.

    THE FAILURE OF A MPC SHAREHOLDER TO COMPLY STRICTLY WITH THE MONTANA
BUSINESS CORPORATION ACT STATUTORY REQUIREMENTS WILL RESULT IN A LOSS OF
DISSENTERS' RIGHTS. A COPY OF THE RELEVANT STATUTORY PROVISIONS IS ATTACHED AS
ANNEX C. MPC SHAREHOLDERS SHOULD REFER TO ANNEX C FOR A COMPLETE STATEMENT
CONCERNING DISSENTERS' RIGHTS, AND THE FOREGOING SUMMARY OF SUCH RIGHTS IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH ANNEX C.

    If a shareholder exercises dissenters' rights, the dissenting shareholder is
entitled to receive the fair value of his or her shares for which dissenters'
rights are demanded in cash. Such value may be higher or lower than the value of
the Touch America Holdings' shares issuable under the merger agreement.

RESALE OF TOUCH AMERICA HOLDINGS' COMMON STOCK

    Touch America Holdings' stock issued in the transaction will not be subject
to any restrictions on transfer arising under the Securities Act of 1933, except
for shares issued to any MPC shareholder who is, or is expected to be, an
"affiliate" of MPC for purposes of Rule 145 under the Securities Act. It is
expected that these shareholders will agree not to transfer any Touch America
Holdings' stock received in the transaction except pursuant to an effective
registration statement under the Securities Act or in a transaction not required
to be registered under the Securities Act. This proxy statement/prospectus does
not cover resales of Touch America Holdings' stock received by any person upon
completion of the transaction, and no person is authorized to make any use of
this proxy statement/prospectus in connection with any resale.

                                       44
<PAGE>
                SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS;
                       DIRECTORS; AND EXECUTIVE OFFICERS

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS OF MPC

    The following table provides, as of October 31, 2000, information with
respect to persons who are known to MPC to beneficially own more than five
percent of the common and preferred shares of MPC.

<TABLE>
<CAPTION>
NAME AND ADDRESS
OF BENEFICIAL OWNER                      AMOUNT AND NATURE OF OWNERSHIP     PERCENT OF CLASS
-------------------                   ------------------------------------  ----------------
<S>                                   <C>                                   <C>
Lehman Brothers Holdings, Inc.         50,420 shares of $6.875 Series(1)          8.7(1)
3 World Financial Center
New York, NY 10285
</TABLE>

------------------------

(1) These securities were acquired in the ordinary course of business and not
    for the purpose of having an effect on changing or influencing the control
    of MPC and were not acquired in connection with, or as a participant in, any
    transaction having such purpose or effect.

    On July 9, 1999, Lehman Brothers Holding, Inc., a broker/dealer registered
under Section 15 of the Securities Exchange Act of 1934, filed a Schedule 13G
report with the Securities and Exchange Commission reporting their ownership of
Preferred Stock, $6.875 Series.

SECURITY OWNERSHIP OF MANAGEMENT OF MPC

    The following table shows, as of October 31, 2000, all of the common and
preferred shares owned beneficially by each person who is or was a director of
MPC since December 31, 1999. In addition, the following table shows, as of
October 31, 2000, all of the common shares owned beneficially by (i) MPC's Chief
Executive Officer, Robert P. Gannon, (ii) MPC's four most highly compensated
executive officers other than Mr. Gannon, who were serving as executive officers
as of the end of the last fiscal year and (iii) the directors and executive
officers of MPC as a group.

<TABLE>
<CAPTION>
NAME OF OWNER                                                  COMMON     PREFERRED   % OF CLASS
-------------                                                 ---------   ---------   ----------
<S>                                                           <C>         <C>         <C>
Tucker Hart Adams(1)(8).....................................      3,628        0           *
Alan F. Cain(2)(8)..........................................      6,074        0           *
John G. Connors(8)..........................................     23,554        0           *
R. D. Corette(8)............................................      9,562        0           *
Richard F. Cromer(3)(9)(10).................................    118,453      250           *
Kay Foster(4)(8)............................................      9,489        0           *
Robert P. Gannon(5)(9)(10)..................................    187,029        0           *
Jack D. Haffey(9)(10).......................................     89,477        0           *
John R. Jester(8)...........................................      9,867        0           *
Carl Lehrkind, III(6).......................................     16,761        0           *
Michael Meldahl(9)(10)......................................     92,651        4           *
Deborah D. McWhinney........................................      5,065        0           *
Jerrold P. Pederson(9)(10)..................................    142,652        0           *
Noble E. Vosburg(7)(8)......................................      8,580        0           *
All Directors and Executive Officers as a Group (21 in
  Number)(11)...............................................  1,064,622      254           *
</TABLE>

------------------------

   * Less than one percent of each class of common and preferred

 (1) Includes 96 shares of common stock held by Dr. Adams' spouse.

                                       45
<PAGE>
 (2) Includes 27 shares of common stock held by Dr. Cain's spouse for which
     Mr. Cain disclaims beneficial ownership.

 (3) Includes 2,668 shares of common stock held by Mr. Cromer's spouse for which
     he disclaims beneficial ownership; 178 shares of common stock held in a
     custodian account for his granddaughter for which Mr. Cromer is the
     custodian and which he has voting and investment power; and 250 units of
     the Quarterly Income Preferred Stock (QUIPS), Series A issued by Montana
     Power Capital 1, a subsidiary of MPC. These units do not have voting rights
     with respect to MPC.

 (4) Includes 324 shares of common stock held by Ms. Foster's spouse.

 (5) Includes 32,439 shares held by Mr. Gannon's spouse for which Mr. Gannon
     disclaims beneficial ownership.

 (6) Includes 2,200 shares of common stock held by the Trustee for
     Lehrkind's, Inc., Profit Sharing Plan #2 for which Mr. Lehrkind is a
     beneficiary and for which he has shared voting and investment power; and
     9,065 shares of common stock held by Lehrkind's, Inc., for which he has
     shared voting and investment power.

 (7) Includes 268 shares of common stock held by Mr. Vosburg's spouse for which
     Mr. Vosburg disclaims beneficial ownership.

 (8) Includes deferred stock units held in MPC's Non-Employee Directors' Stock
Compensation Plan:
     Ms. Adams--3,446;
     Mr. Cain--4,114;
     Mr. Connors--960;
     Mr. Corette--3,829;
     Ms. Foster--3,721;
     Mr. Jester--6,867; and
     Mr. Vosburg--3,597.
     The holders of these units have no voting or investment power.

 (9) Includes shares in MPC's Retirement Savings Plan 401(k) attributable to
     MPC's and the employee's contributions as follows:
     Mr. Cromer--12,584;
     Mr. Gannon--18,383;
     Mr. Haffey--15,310;
     Mr. Meldahl--9,358; and
     Mr. Pederson--17,552.

 (10) Includes option shares exercisable within 60 days of year-end:
     Mr. Cromer--92,731;
     Mr. Gannon--125,934;
     Mr. Haffey--61,334;
     Mr. Meldahl--64,150; and
     Mr. Pederson--123,100.

 (11) Includes 133,836 shares held for executive officers in MPC's Retirement
      Savings Plan 401(k); 702,636 option shares exercisable within 60 days of
      year-end.

                                       46
<PAGE>
                               REGULATORY MATTERS

GENERAL

    A summary of the material regulatory matters affecting approval of the sale
of the utility business to NorthWestern are set forth below. The parties to the
purchase agreement have agreed to take commercially reasonable steps to obtain
all governmental approvals and clearances necessary to consummate the sale of
the utility business to NorthWestern.

    While we believe that we will receive the regulatory approvals and
clearances for the sale of the utility business to NorthWestern, there can be no
assurances as to the timing of these approvals and clearances or our ability to
obtain these approvals and clearances on satisfactory terms or otherwise.
Consummation of the sale of the utility business to NorthWestern is conditioned
upon receipt of final orders from the various federal and state commissions
described below and that the final orders satisfy conditions described in "The
Purchase Agreement--Conditions to the Completion of the Sale of the Utility
Business to NorthWestern" below on page 50. There can be no assurance that any
of these approvals or clearances will be obtained or, if obtained, will satisfy
the conditions described in such section.

STATE APPROVALS OR FILINGS

    State regulatory approvals and filings will be obtained and made, as
applicable, prior to the consummation of the sale of the utility business to
NorthWestern, unless MPC otherwise determines, including as follows:

    - The Montana Public Service Commission has jurisdiction to determine
      whether the sale of the utility business to NorthWestern will affect MPC's
      ability to be fit, willing and able to provide reasonably adequate service
      and facilities at just and reasonable rates. On [  ], 2000, MPC filed an
      application with the Montana Public Service Commission for approval with
      respect to the sale of the utility business to NorthWestern.

FEDERAL ENERGY REGULATORY COMMISSION

    Section 203 of the Federal Power Act provides that no public utility may
sell or otherwise dispose of its jurisdictional facilities, directly or
indirectly merge or consolidate its facilities with those of any other person,
or acquire any security of any other public utility without first having
obtained authorization from the Federal Energy Regulatory Commission. Because
MPC owns "jurisdictional facilities" under the Federal Power Act, the Federal
Energy Regulatory Commission's approval under Section 203 is required before the
merger of MPC and The Montana Power L.L.C. and the sale of the utility business
to NorthWestern. Section 203 provides that the Federal Energy Regulatory
Commission is required to grant its approval if the sale of the utility business
to NorthWestern is found to be "consistent with the public interest." The
Federal Energy Regulatory Commission's current policy provides that it will
evaluate the following criteria in analyzing whether a transaction satisfies the
requirements of Section 203 of the Federal Power Act:

    - the effect of the transaction on competition to determine if the
      transaction will result in an increase in market power;

    - the effect of the transaction on regulated rates, to determine if rate
      payers will be protected from any adverse effects of the transaction; and

    - the effect of the transaction on state and federal regulation to determine
      if the transaction will result in any impairment of state or Federal
      regulation.

    The Federal Energy Regulatory Commission will review these factors to
determine whether the sale of the utility business to NorthWestern is consistent
with the public interest. If the Federal Energy

                                       47
<PAGE>
Regulatory Commission finds that the sale of the utility business to
NorthWestern would adversely affect competition, rates, or regulation, it may,
pursuant to the Federal Power Act, deny approval of the transaction or impose
remedial conditions intended to mitigate such effects. Based on recent Federal
Energy Regulatory Commission decisions, MPC and NorthWestern believe that the
sale of the utility business to NorthWestern will satisfy the Federal Energy
Regulatory Commission's criteria for ensuring that the sale of the utility
business to NorthWestern will not have adverse effects on competition, rates or
regulation. MPC and NorthWestern filed their joint application under
Section 203 of the Federal Power Act on December 20, 2000.

    Section 8 of the Federal Power Act requires approval of the Federal Energy
Regulatory Commission prior to the transfer of hydroelectric license. Because
MPC has a hydroelectric license under the Federal Power Act for the operation of
the Milltown Dam hydroelectric facility, the Federal Energy Regulatory
Commission's approval is required prior to the transfer of the license from MPC
to The Montana Power L.L.C. The Federal Energy Regulatory Commission will grant
a license transfer if the transferee is qualified to hold the license and
operate the facility and if the transfer is in the public interest. MPC believes
that the transfer of the license to The Montana Power L.L.C. will satisfy these
criteria. MPC and The Montana Power L.L.C. filed a joint application for the
transfer of the license on December 22, 2000.

UNITED STATES ANTITRUST LAW

    The Hart-Scott-Rodino Antitrust Improvements Act and the related rules and
regulations prohibit MPC and NorthWestern from completing the sale of the
utility business to NorthWestern until they submit required information to the
Antitrust Division of the Department of Justice and the Federal Trade Commission
and until applicable waiting period requirements have been satisfied. Even after
the Hart-Scott-Rodino waiting period expires or terminates, the Antitrust
Division or the Federal Trade Commission may later challenge the sale of the
utility business to NorthWestern on antitrust grounds. MPC and NorthWestern do
not believe that the sale of the utility business to NorthWestern will violate
federal antitrust laws. If the transaction is not completed within 12 months
after the expiration or earlier termination of the initial Hart-Scott-Rodino
waiting period, MPC and NorthWestern would be required to submit new information
to the Antitrust Division and the Federal Trade Commission, and a new
Hart-Scott-Rodino waiting period would begin. NorthWestern and MPC each filed a
notification and report form under the Hart-Scott-Rodino Antitrust Improvements
Act on [      ], and the waiting period expired 30 days after this filing.

                                       48
<PAGE>
                              THE MERGER AGREEMENT

    THE FOLLOWING SUMMARY OF THE MERGER AGREEMENT IS QUALIFIED BY REFERENCE TO
THE COMPLETE TEXT OF THE MERGER AGREEMENT, WHICH IS INCORPORATED BY REFERENCE
AND ATTACHED AS ANNEX A.

THE MERGER BETWEEN MPC AND THE MONTANA POWER L.L.C.

    Under the Merger Agreement, MPC will merge with and into The Montana Power
L.L.C., a subsidiary of Touch America Holdings, with The Montana Power L.L.C.
being the surviving entity. Upon completion of the merger, MPC's shareholders
will become shareholders of Touch America Holdings.

TIMING

    The merger will become effective upon the filing of the Articles of Merger
pursuant to the Montana Business Corporation Act and the Montana Limited
Liability Company Act with the Secretary of State of the State of Montana.

MERGER CONSIDERATION

    The merger agreement provides that each issued MPC common share and each
issued MPC preferred share will, at the effective time of the merger, be
automatically converted into one share of Touch America Holdings' common stock
and one share of Touch America Holdings' preferred stock, respectively.

CONDITIONS TO THE COMPLETION OF THE MERGER

    Each party's obligation to complete the merger is subject to the
satisfaction of the following conditions:

    - Federal Energy Regulatory Commission approval,

    - approval by MPC's shareholders and Touch America Holdings, as the sole
      member of The Montana Power L.L.C.,

    - MPC receiving a ruling from the IRS or an opinion of outside counsel
      satisfactory to the MPC Board with respect to tax consequences of the
      merger, and

    - approval for listing on the New York Stock Exchange and the Pacific
      Exchange, Inc. of Touch America Holdings' common stock.

TERMINATION OF THE MERGER AGREEMENT

    The merger agreement may be terminated at any time, whether before or after
approval of the merger agreement by the MPC shareholders, by the MPC Board if it
determines for any reason that the merger would be inadvisable or not in the
best interest of MPC's shareholders.

                                       49
<PAGE>
                             THE PURCHASE AGREEMENT

    THE FOLLOWING SUMMARY OF THE PURCHASE AGREEMENT IS QUALIFIED BY REFERENCE TO
THE COMPLETE TEXT OF THE PURCHASE AGREEMENT, WHICH IS INCORPORATED BY REFERENCE
AND ATTACHED AS ANNEX B.

THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN

    Under the purchase agreement, following the merger, Touch America Holdings
will sell its single membership interest in The Montana Power L.L.C. (which will
constitute the utility business of MPC) to NorthWestern.

TIMING OF CLOSING

    The closing will occur 5 business days after the day on which the last of
the conditions set forth in the purchase agreement has been satisfied or waived,
unless MPC and NorthWestern agree to a different date.

CONSIDERATION

    The purchase agreement provides that NorthWestern will pay MPC $602 million
in cash. In addition, NorthWestern will assume up to $488 million of MPC's debt.

CONDITIONS TO THE COMPLETION OF THE SALE OF THE UTILITY BUSINESS TO NORTHWESTERN

    MUTUAL CLOSING CONDITIONS

    The obligations of MPC, Touch America Holdings and NorthWestern to complete
the sale of the utility business to NorthWestern is subject to the satisfaction
or waiver of the following conditions:

    - accuracy as of closing of the representations and warranties made by MPC,
      Touch America Holdings and NorthWestern to the extent set forth in the
      purchase agreement,

    - performance in all material respects of the obligations required to be
      performed by MPC, Touch America Holdings and NorthWestern at or prior to
      the sale of the utility business to NorthWestern,

    - all regulatory approvals necessary to permit MPC, Touch America Holdings
      and NorthWestern to consummate the transactions contemplated by the
      purchase agreement being obtained at or prior to the sale of the utility
      business to NorthWestern,

    - receipt of a certificate of an executive officer of Touch America Holdings
      and NorthWestern as to the satisfaction of closing conditions for the sale
      of utility business to NorthWestern,

    - absence of legal prohibition on completion of the sale of the utility
      business to NorthWestern, and

    - all third party consents shall have been obtained and be in full force and
      effect.

                                       50
<PAGE>
    ADDITIONAL CLOSING CONDITIONS FOR NORTHWESTERN'S BENEFIT.

    NorthWestern's obligation to complete the sale of the utility business to
NorthWestern is subject to the following additional conditions:

    - the completion of the restructuring,

    - the termination or transfer of certain MPC benefit plans,

    - the resignation of Touch America Holdings as manager of The Montana Power
      L.L.C., and

    - the assignment of certain contracts to The Montana Power L.L.C. or MPC's
      subsidiaries by MPC.

NO SOLICITATION BY MPC AND TOUCH AMERICA HOLDINGS

    MPC and Touch America Holdings have agreed that MPC and Touch America
Holdings and their subsidiaries and directors, officers, employees, advisors or
other representatives will not, directly or indirectly:

    - solicit, encourage (including by way of furnishing information), receive,
      negotiate, assist or otherwise facilitate or accept any offer or inquiry
      from any person concerning an acquisition proposal, or

    - participate in any discussions or negotiations regarding any acquisition
      proposal involving it.

    The purchase agreement states that the term "acquisition proposal" means any
proposal or offer with respect to:

    (1) a merger, reorganization, consolidation, business combination,
recapitalization, liquidation, dissolution or similar transaction involving
(x) prior to the merger and the sale of the utility business to NorthWestern,
MPC or any of its subsidiaries, and (y) from and after the merger but prior to
the sale of the utility business to Northwestern, Touch America Holdings or any
of its subsidiaries, or

    (2) any direct or indirect acquisition of all or any substantial portion of
the assets or 10% or more of the equity securities of (x) prior to the merger
and the sale of the utility business to NorthWestern, MPC or any of its
subsidiaries, and (y) from and after the merger but prior to the sale of the
utility business to NorthWestern, Touch America Holdings or any of its
subsidiaries, other than, in any such case, the transactions contemplated by the
purchase agreement and the sale of MPC's oil and gas business, coal business and
independent power production business.

    Notwithstanding the foregoing, MPC or the MPC Board shall be permitted to:

    (1) to the extent applicable, comply with Rule 14e-2(a) promulgated under
the Exchange Act with regard to an acquisition proposal, or

    (2) engage in any discussions or negotiations with, or provide any
information to any person in response to an unsolicited bona fide written
acquisition proposal, by any such person, if,

        (i) the special meeting shall not have occurred,

        (ii) the MPC Board concludes in good faith after consultation with its
             financial advisors and legal advisors, that the acquisition
             proposal would reasonably be expected to constitute a superior
             proposal (as defined below),

       (iii) prior to providing any information or data in connection with an
             acquisition proposal, the MPC Board receives from such person an
             executed confidentiality agreement on terms no less favorable to
             MPC than those contained in the confidentiality agreement between
             MPC and NorthWestern regarding the sale of the utility business to
             NorthWestern, and

                                       51
<PAGE>
        (iv) prior to providing any information or data or entering into
             discussions or negotiations, the MPC Board notifies NorthWestern
             immediately of such inquiries, proposals or offers, any information
             requested, any discussions or negotiations, and indicates the name
             of such person and the material terms and conditions of any
             proposals or offers.

    The purchase agreement states that the term "superior proposal" means a bona
fide written acquisition proposal which the MPC Board (prior to the merger and
the sale of the utility business to NorthWestern) or Touch America Holdings
(after the merger but prior to the sale of the utility business to NorthWestern)
concludes in good faith after consultation with a financial advisor of
nationally recognized reputation, taking into account, all legal, financial,
regulatory and other aspects of the proposal and the person making the proposal
(including, but not limited to, any break-up fees, expense reimbursement
provisions and conditions to consummation),

        (i) would, if consummated, result in a transaction that is more
            favorable to all of the shareholders (in their capacities as
            shareholders) of MPC (prior to the merger and the sale of the
            utility business to NorthWestern) or Touch America Holdings (after
            the merger but prior to the sale of the utility business to
            NorthWestern), from a financial point of view than the transactions
            contemplated by the Purchase Agreement, and

        (ii) is reasonably likely to be consummated; provided, that, for
             purposes of this definition, the term "acquisition proposal" shall
             have the meaning described in the second paragraph of this section
             (See "--No Solicitation by MPC and Touch America Holdings" above on
             page 51) except that (x) the reference to "10%" in the definition
             of "acquisition proposal" shall be deemed to be "51%",
             (y) "acquisition proposal" shall only be deemed to refer to a
             transaction involving, prior to the merger and the sale of the
             utility business to NorthWestern, MPC, and after the merger but
             prior to the sale of the utility business to NorthWestern, Touch
             America Holdings, and (z) the reference to "assets" shall refer to
             the assets of, prior to the merger and the sale of the utility
             business to NorthWestern, MPC and its subsidiaries taken as a
             whole, and after the merger but prior to the sale of the utility
             business to NorthWestern to MPC and its subsidiaries, taken as a
             whole, and not the assets of any of its subsidiaries alone.

    The purchase agreement, however, provides that, in the event that, prior to
MPC shareholders approval, the MPC Board determines, after consultation with its
financial advisors and outside counsel, that a takeover proposal constitutes a
superior proposal, the MPC Board may terminate the purchase agreement. Any such
termination must be at least three business days after written notice to
NorthWestern. The written notice must state that the MPC Board plans to accept
the superior proposal, specify the terms and conditions of the proposal and
identify the person making the proposal. Furthermore, MPC must, concurrently
with the termination, enter into an acquisition agreement with respect to the
superior proposal and pay to NorthWestern the applicable termination fees and
the fees and expenses incurred by NorthWestern in connection with the
transaction. See "--Termination Fees; Reimbursement of Expenses" below on page
53.

    The purchase agreement also provides that MPC will immediately advise
NorthWestern if it receives a request for information or of any takeover
proposal, the material terms and conditions of the request or proposal and the
identity of the person making the request or proposal. Under the purchase
agreement, MPC is also required to keep NorthWestern reasonably informed of the
status and details of any such request or proposal.

                                       52
<PAGE>
TERMINATION OF THE PURCHASE AGREEMENT

    The purchase agreement may be terminated at any time prior to the completion
of the sale of the utility business to NorthWestern:

    (1) by mutual written agreement of Touch America Holdings, MPC and
       NorthWestern;

    (2) by Touch America Holdings, MPC or NorthWestern if:

       (a) the sale of the utility business to NorthWestern has not been
           completed by March 31, 2002,

       (b) MPC's shareholders do not give the required approvals,

       (c) there is a permanent legal prohibition to the sale of the utility
           business to NorthWestern, or

       (d) there shall have been a material breach of any representation,
           warranty or covenant which is not cured within 15 days written notice
           or cannot be cured by March 31, 2002;

    (3) by NorthWestern if (i) the MPC Board shall have failed to recommend, or
       withdrawn, modified or amended in any respect adverse to NorthWestern its
       approval or recommendation of the purchase agreement or approved or
       recommended a superior proposal (as such term is defined under "--No
       Solicitation By MPC And Touch America Holdings" above) or (ii) MPC or
       Touch America Holdings breaches certain agreements; or

    (4) prior to MPC stockholders' approval, by MPC or Touch America Holdings if
       the MPC Board has determined that an acquisition proposal (as such term
       is defined under "--No Solicitation By MPC And Touch America Holdings"
       above on page 51) constitutes a superior proposal; provided that (i) MPC
       has provided 3 business days' notice to NorthWestern, (ii) MPC has not
       taken any action to solicit any offers and has prepared and mailed this
       proxy statement and obtained MPC stockholder approval, (iii) the superior
       proposal is pending at the time of such termination, (iv) the MPC Board
       has determined in good faith that such proposal is a superior proposal,
       (v) MPC and Touch America Holdings have negotiated in good faith with
       NorthWestern with respect to any modifications to the terms of the
       purchase agreement proposed by NorthWestern that would enable MPC and
       NorthWestern to proceed with the sale of the utility business to
       NorthWestern, and (vi) MPC has paid the termination fee and expense fee
       discussed below.

TERMINATION FEES; REIMBURSEMENT OF EXPENSES

    TERMINATION FEES

    MPC or Touch America Holdings must pay to a termination fee of $50 million
to NorthWestern if any of the following occurs:

    (1) the MPC Board (i) fails to recommend, or withdraws, modifies or amends
       in any respect adverse to NorthWestern its approval or recommendation of
       the purchase agreement or (ii) approves or recommends a superior
       proposal, or MPC or Touch America Holdings breaches certain agreements
       pursuant to paragraph (3) under "--Termination of the Purchase Agreement"
       above; or

    (2) a takeover proposal has been made with respect to MPC and the purchase
       agreement is terminated by MPC or Touch America Holdings pursuant to
       paragraph (4) under "--Termination of the Purchase Agreement" above;
       provided, that the termination fee is not payable if Touch America
       Holdings or MPC fail to enter into an agreement to consummate, or do not
       consummate, a transaction the proposal of which would have constituted an

                                       53
<PAGE>
       acquisition proposal (as such term is defined under "--No Solicitation By
       MPC And Touch America Holdings" above) within 12 months of the
       termination.

    REIMBURSEMENT OF EXPENSES

    MPC or Touch America Holdings must pay a reimbursement of expenses fee of
$10 million to NorthWestern if:

    (1) MPC, Touch America Holdings or NorthWestern terminates the purchase
       agreement because of the failure of MPC's shareholders to approve the
       purchase agreement;

    (2) NorthWestern terminates the purchase agreement because the MPC Board
       fails to recommend or withdraws its approval of the purchase agreement,
       or recommends a superior proposal, or MPC or Touch America Holdings
       breach certain agreements in the purchase agreement pursuant to
       paragraph (3) under "--Termination of the Purchase Agreement" above;

    (3) MPC or Touch America Holdings terminates the purchase agreement under
       the circumstances set forth in paragraph (4) above under "--Termination
       of the Purchase Agreement" above; or

    (4) NorthWestern terminates the purchase agreement because of a material
       breach of any representation, warranty or covenant which is not cured
       within 15 days written notice or cannot be cured by March 31, 2002.

INTERIM OPERATIONS OF MPC

    Under the purchase agreement, MPC has agreed that, prior to the completion
of the sale of the utility business to NorthWestern, it will, and will cause The
Montana Power L.L.C. and MPC's subsidiaries to, conduct business in all material
respects in the ordinary course consistent with past practice and in compliance
in all material respects with applicable laws and to seek renewal of all
licenses and permits required or necessary for the operation of the utility
business. MPC has agreed to use all commercially reasonable best efforts to
preserve intact its present business organization, to preserve its reputation
and the franchises of MPC, The Montana Power L.L.C. and MPC's subsidiaries in
all material respects, and to keep available the services of key officers and
employees of MPC and its subsidiaries. In addition, MPC has agreed to maintain
the assets and properties of MPC, The Montana Power L.L.C. and MPC's
subsidiaries in good working order, and to maintain the good will of key
customers, suppliers and lenders and other persons with whom MPC or any of its
subsidiaries have significant business relationships. MPC has also agreed that,
subject to limited exceptions (including the merger), prior to the completion of
sale of the utility business to NorthWestern it and its subsidiaries will not,
without the prior written consent of NorthWestern, among other things:

    (1) DIVIDENDS

       - declare, set aside or pay any dividends on, or make any other
         distributions in respect of, any capital stock of MPC or its
         subsidiaries, or indirectly redeem, purchase or otherwise acquire any
         capital stock or any option with respect to MPC, The Montana Power
         L.L.C. or any subsidiary, or other than:

           - declaring a regular quarterly cash dividend on MPC common stock not
             to exceed twenty (20) cents per share, and

           - the payment of dividends required to be paid on MPC preferred
             stock,

    (2) CAPITAL STOCK

       - authorize the issuance, sell or otherwise dispose of any other
         securities in respect of any equity interest of MPC, The Montana Power
         L.L.C. or any subsidiaries or modifying or

                                       54
<PAGE>
         amending any right in respect of any equity interest of MPC, The
         Montana Power L.L.C. or any subsidiary,

    (3) AMENDMENTS TO GOVERNING DOCUMENTS

       - amend their certificate of incorporation, by-laws or other comparable
         governing documents in any material respect or take any action with
         respect to any such amendment or any recapitalization, reorganization,
         liquidation or dissolution of any such corporation,

    (4) ACQUISITIONS AND OTHER TRANSACTIONS

       - other than in connection with the restructuring engaging with any
         person in any merger or other business combination,

    (5) DISPOSITIONS

       - acquire or dispose of, or incur any lien on (other than a permitted
         lien), any assets and properties individually or in the aggregate
         material to the business or condition of MPC and The Montana Power
         L.L.C., and

       - sell any cushion gas other than in accordance with prudent utility
         practices,

    (6) INDEBTEDNESS

       - except as set forth in MPC's budget, voluntarily incur any indebtedness
         in an aggregate principal amount exceeding $5,000,000 (other than
         refinancings where the principal amount refinanced is no greater than
         the amount repaid),

       - purchase, cancel, prepay or otherwise provide for a complete or partial
         discharge in advance of a scheduled payment date with respect to, or
         waive any right under, any indebtedness in an aggregate principal
         amount exceeding $1,000,000 (in either case other than indebtedness of
         MPC, The Montana Power L.L.C. or a subsidiary owing to MPC, The Montana
         Power L.L.C. or a wholly-owned subsidiary); provided, however, that
         MPC, Touch America Holdings, The Montana Power L.L.C. and their
         subsidiaries may take any and all actions necessary or appropriate to
         terminate the Employee Stock Ownership Plan portion of MPC 401(k) Plan,
         and to prepay any outstanding indebtedness of MPC, The Montana Power
         L.L.C. and the subsidiaries attributable to such Employee Stock
         Ownership Plan, or

       - except as set forth in MPC's budget, make any loans or advances by it
         to, or guarantee, endorse or otherwise be or become contingently
         liable, directly or indirectly, in connection with the obligations,
         stocks or dividends of, or own, purchase or acquire stock, obligations
         or securities of, or any other interest in, or make any capital
         contributions to, any person,

    (7) CAPITAL EXPENDITURES

       - except as set forth in MPC's budget, make (1) capital expenditures or
         commitments for additions to property, plant or equipment constituting
         capital assets or (2) make expenditures with respect to operations and
         maintenance or incurring general and administrative expenses, in each
         case in an aggregate amount exceeding $1,000,000,

    (8) EMPLOYEE MATTERS

       - other than in the ordinary course of business or to the extent required
         by applicable law (including without limitation, the duty to bargain in
         good faith under any collective bargaining agreement), and subject in
         each case to prior written notice to, and consultation with,
         NorthWestern, adopt, enter into or become bound by any material benefit
         plan, employment-related contract or collective bargaining agreement,
         or amend, modify or terminate (partially or completely) any such
         benefit plan (other than the Employee Stock

                                       55
<PAGE>
         Ownership Plan portion of MPC's 401(k) Plan), employment-related
         contract or collective bargaining agreement if such action will result
         in material additional cost to MPC, or

       - effectuate a "plant closing" or "mass layoff", as those terms are
         defined in the Worker Adjustment and Retraining Act, affecting in whole
         or in part any site of employment, facility, operating unit or employee
         of MPC, The Montana Power L.L.C. or any of MPC's subsidiaries,

    (9) TAXES

       - make or change any tax election, file any amended tax return, settle or
         compromise any federal, state, local or foreign tax liability, change
         any annual tax accounting period, change any method of tax accounting,
         enter into any closing agreement relating to any tax, surrender any
         right to claim a tax refund, or consent to any extension or waiver of
         the limitations period applicable to any tax claim or assessment, in
         each case in a manner which could reasonably be expected to have
         material adverse effect on NorthWestern, MPC or its subsidiaries after
         the sale of the utility business to NorthWestern,

   (10) ACCOUNTING

       - make any material change in any pricing, investment, accounting,
         financial reporting, inventory, credit or allowance practice or tax
         practice policy or any method of calculating any bad debt, contingency
         or other reserve for accounting, financial reporting, or tax purposes,
         except as required by applicable law or reasonably and in good faith
         believed by MPC or The Montana Power L.L.C. to be in the best interests
         of MPC, The Montana Power L.L.C. or MPC's subsidiaries, or

       - change its fiscal year,

   (11) AGREEMENTS AND CLAIMS

       - pay, discharge or satisfy any claims, liabilities or obligations
         (obsolete, accrued, asserted or unasserted, contingent or otherwise),
         other than the payment, discharge or satisfaction in the ordinary
         course of business and consistent with past practice of liabilities
         reflected or reserved against in the balance sheet comprising the
         financial statement dated July 31, 2000,

   (12) OTHER ACTIONS

       - enter into any contract to do or engage in any of the foregoing, or

   (13) MPC BENEFIT RESTORATION PLANS

       - allow any new participant in the MPC benefit restoration plan for
         senior executives or the MPC benefit restoration plan for directors or
         amend or modify the terms of such plans other than to transfer
         participants or obligations out of such plans to Touch America Holdings
         or its affiliates in a manner that results in no liability to
         NorthWestern.

    GENERATION SALE PROCEEDS

    In addition, MPC has agreed to maintain the net after tax cash proceeds from
its sale of MPC's generation and related assets to PPL Montana LLC, after
reduction for unrecovered regulatory assets, as cash reserves (which as of
September 29, 2000 shall not be less than $55,000,000). MPC has also agreed not
to apply these proceeds except as mandated by the Montana Public Service
Commission or the Federal Energy Regulatory Commission final order (or if such
order is appealed by the final non-appealable order of the applicable court with
jurisdiction over such appeal) on stranded cost recovery or as otherwise
consented to by NorthWestern.

                                       56
<PAGE>
INDEMNIFICATION

    Under the purchase agreement, Touch America Holdings has agreed to indemnify
NorthWestern for any adverse consequences relating to any liability of Touch
America Holdings, The Montana Power L.L.C., MPC and MPC's subsidiaries for:

    - any taxes of Touch America Holdings, The Montana Power L.L.C., MPC and any
      member of MPC's affiliated group and MPC's subsidiaries with respect to
      any tax year or portion of such tax year ending on or before the
      consummation of the sale of the utility business to NorthWestern and for
      the unpaid taxes of any person under Treas. Reg. Section1.1502-6,

    - the restructuring and/or the sales of the oil and gas, coal and
      independent power production businesses, any aspect of the business of
      Touch America Holdings (other than The Montana Power L.L.C. or MPC's
      subsidiaries) or regulatory requirements with respect to the use of
      proceeds of the sale of the oil and gas business,

    - certain amounts relating to a wholesale transmission services agreement,

    - any claim or other similar action relating to any environmental loss
      sustained or required to be paid prior to the sale of the utility business
      to NorthWestern by reason of, or arising out of or caused by any act or
      omission occurring, or condition existing, on or prior to the consummation
      of the utility business to NorthWestern, and

    - certain litigation matters.

    Under the purchase agreement, NorthWestern has agreed to indemnify Touch
America Holdings for any adverse consequences relating to any liability of
NorthWestern for:

    - any taxes of NorthWestern, The Montana Power L.L.C. and MPC's subsidiaries
      with respect to any tax year or portion thereof after the consummation of
      the sale of the utility business to NorthWestern (or for any tax year
      beginning before and ending after the consummation of the sale of the
      utility business to NorthWestern to the extent allocable), and

    - the operation of the business of MPC, The Montana Power L.L.C. and MPC's
      subsidiaries from and after the consummation of the sale of the utility
      business to NorthWestern.

AMENDMENT; EXTENSION AND WAIVER

    - MPC, Touch America Holdings and NorthWestern may mutually amend the
      purchase agreement by written instrument at any time, except that after
      the purchase agreement has been approved by MPC's shareholders, such
      shareholders must approve any later amendments to the extent required by
      law, and

    - prior to the completion of the sale of the utility business to
      NorthWestern, a party may, in writing, extend the time for performance of
      the obligations of any other party, waive inaccuracies in representations
      and warranties of any other party and, except as provided in the previous
      paragraph, waive compliance by any other party with any agreements or
      conditions in the purchase agreement.

    To the extent required by law, MPC would resolicit shareholder votes in the
event of a material amendment to the purchase agreement prior to shareholder
approval or in the event that a material condition to the sale of the utility
business to NorthWestern was waived prior to or after shareholder approval.

                                       57
<PAGE>
REPRESENTATIONS AND WARRANTIES

    The purchase agreement contains customary representations and warranties
made by MPC, Touch America Holdings and NorthWestern to each other many of which
are substantially reciprocal. Some of the most significant of these relate to:

    - capital structure,

    - corporate authorization to enter into the purchase agreement,

    - absence of any breach of organizational documents, law or material
      agreements as a result of the contemplated transaction,

    - government approvals required in connection with the purchase agreement
      transactions,

    - governmental filings and financial statements,

    - absence of material changes or events,

    - compliance with laws,

    - litigation,

    - benefit plans,

    - employee benefit matters,

    - proper filing of tax returns and other tax matters, and

    - compliance with environmental laws and other environmental matters.

    In addition, MPC and Touch America Holdings represent and warrant to
NorthWestern as to other matters, including labor and employee relations and the
inapplicability of MPC's shareholder rights plan to the transaction, and
NorthWestern represents and warrants to MPC and Touch America Holdings as to
certain other matters, including adequate financing for the cash portion of the
consideration for the sale of the utility business to NorthWestern.

                     THE REDEMPTION OF THE PREFERRED STOCK

    On October 24, 2000, the members of the MPC Board present at the meeting
unanimously approved the redemption of all the outstanding Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series of MPC. Pursuant to MPC's
Restated Articles of Incorporation, dated March 24, 1998, the redemption of the
preferred stock depends on an affirmative vote of at least a majority of the
holders of MPC common stock.

    As of December 31, 2000, the amount outstanding under the Preferred Stock,
$6.00 Series was $16,000,000, and the amount outstanding under the Preferred
Stock, $4.20 Series was $6,000,000.

    Pursuant to MPC's Restated Articles of Incorporation, the Preferred Stock,
$6.00 Series is redeemable at any time, and the $4.20 Series Preferred Stock is
redeemable at any time after May 1, 1969.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series will be deemed to receive in the
merger one share of Touch America Holdings' Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, for each outstanding share of Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series, respectively. The terms of the
Touch America Holdings' Preferred Stock, $4.20 and Preferred Stock, $6.00 Series
will be identical to the terms of Preferred Stock, $4.20 Series and Preferred
Stock, $6.00 Series, respectively.

                                       58
<PAGE>
                        UNAUDITED PRO FORMA CONSOLIDATED
                 FINANCIAL STATEMENTS OF TOUCH AMERICA HOLDINGS

    The following unaudited pro forma consolidated financial information
illustrates the effects of the proposals solicited in this proxy
statement/prospectus on our results of Touch America Holdings' operations and
financial position. Such proposals relate to the approvals of:

    - the plan of merger;

    - the sale of the utility business to NorthWestern; and

    - the redemption of preferred stock.

In addition, the unaudited pro forma consolidated financial information
illustrates the effects of the pending and expected sale of Continental Energy
Services, Inc., or Continental Energy, and, as discussed below, the acquisition
as of June 30, 2000 of certain divested businesses of Qwest Communications
International Inc., or Qwest.

    Except as noted in the following sentence, the unaudited pro forma
consolidated statements of income for each of the three years in the period
ended December 31, 1999 and for the nine months ended September 30, 2000 were
prepared as if the transactions described in the preceding paragraph
(collectively, the "Transactions") occurred as of January 1, 1997, but exclude
nonrecurring items relating to the Transactions, such as expected proceeds and
gains from pending sales. We have included the effects of the redemption of the
preferred stock and the acquisition of Qwest's divested businesses in the
unaudited pro forma consolidated statements of income only for the year ended
December 31, 1999 and for the nine months ended September 30, 2000.

    The unaudited pro forma consolidated balance sheet at September 30, 2000 was
prepared as if the Transactions occurred on September 30, 2000. Rather than
presenting the expected proceeds and gains from the pending sales of our energy
businesses, we have shown the net assets of these businesses as investment in
discontinued operations, a current asset, in the pro forma consolidated balance
sheet at September 30, 2000.

    The unaudited pro forma consolidated financial information is presented for
illustrative purposes only and does not purport to (1) represent what results of
operations would have been had the Transactions described in fact occurred at
the beginning of the periods or on the date indicated, or (ii) project results
of operations or financial position for any future period or date. For example,
and without limitation, the historical interest expenses and selling, general
and administrative expenses charged to continuing operations may not be
representative of the amounts that Touch America Holdings may incur in the
future.

    The accompanying unaudited pro forma consolidated financial information
should be read in conjunction with:

    - our audited consolidated financial statements for the years ended
      December 31, 1999 and 1998 and for each of the three years in the period
      ended December 31, 1999, as retroactively reclassified to report MPC's
      coal businesses and oil and natural gas businesses as discontinued
      operations. These reclassified consolidated financial statements are
      included in this proxy statement/prospectus (See "Index to the Financial
      Statements" below on page F-1);

    - our unaudited consolidated financial statements as of September 30, 2000
      and for the nine month period ended September 30, 2000, as contained in
      our Quarterly Report on Form 10-Q for the quarter ended September 30, 2000
      that we filed on November 14, 2000; and

                                       59
<PAGE>
    - our Form 8-K/A filed September 15, 2000 containing the:

       - audited special-purpose statement of selected assets of Qwest's
         divested businesses as of June 30, 2000, and the related statements of
         revenues and direct expenses for each of the three years ended
         December 31, 1999;

       - unaudited statement of revenues and direct expenses of Qwest's divested
         businesses for the six months ended June 30, 2000; and

       - unaudited pro forma consolidated financial information relating to the
         effects of our acquisition of Qwest's divested businesses as of and for
         the six months ended June 30, 2000 and for the year ended December 31,
         1999.

    YOU SHOULD READ THE FINANCIAL INFORMATION IN THIS SECTION ALONG WITH MPC'S
HISTORICAL CONSOLIDATED FINANCIAL STATEMENTS AND ACCOMPANYING NOTES INCLUDED IN
THIS PROXY STATEMENT/PROSPECTUS. SEE "WHERE YOU CAN FIND MORE INFORMATION" BELOW
ON PAGE 79 AND "INDEX TO FINANCIAL STATEMENTS" BELOW ON PAGE F-1.

                                       60
<PAGE>
                             TOUCH AMERICA HOLDINGS

              UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF INCOME

                      NINE MONTHS ENDED SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                                     PRO FORMA ADJUSTMENTS
                                                           -----------------------------------------
                                                              UTILITY
                                                            OPERATIONS     CONTINENTAL
                                           SEPTEMBER 30,   AND PREFERRED     ENERGY         QWEST      PRO FORMA
                                               2000         REDEMPTION     OPERATIONS    ACQUISITION    RESULTS
                                           -------------   -------------   -----------   -----------   ---------
                                              NOTE 1          NOTE 2         NOTE 3        NOTE 4
                                                      (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                        <C>             <C>             <C>           <C>           <C>
Revenues.................................    $     680       $    (453)      $    (51)    $    155     $    331
Expenses:
  Operations and maintenance.............          369            (286)            --           86          169
  Selling, general, and administrative...          118             (66)            (2)          31           81
  Taxes other than income taxes..........           47             (42)            --           --            5
  Depreciation, depletion, and
    amortization.........................           54             (41)            --            8           21
  Provision for future losses relating to
    long-term power supply agreements....           10             (10)            --           --           --
                                             ---------       ---------       --------     --------     --------
                                                   598            (445)            (2)         125          276
                                             ---------       ---------       --------     --------     --------
Income from continuing operations........           82              (8)           (49)          30           55
Interest expense and other income:
  Interest...............................           27             (25)            --           --            2
  Distributions on company obligated
    mandatorily redeemable preferred
    securities of subsidiary trust.......            4              (4)            --           --           --
  Other (income) deductions--net.........          (14)              9              2           --           (3)
                                             ---------       ---------       --------     --------     --------
                                                    17             (20)             2           --           (1)
                                             ---------       ---------       --------     --------     --------
Income taxes.............................           26               3            (19)          11           21
Net income from continuing operations....           39               9            (32)          19           35
Dividends on preferred stock.............            3              (1)            --           --            2
                                             ---------       ---------       --------     --------     --------
Net income available from continuing
  operations available for common
  stock..................................    $      36       $      10       $    (32)    $     19     $     33
                                             =========       =========       ========     ========     ========
Average number of common shares
  outstanding--basic (000)...............      105,593                                                  105,593
Basic earnings per share of common
  stock..................................    $    0.35                                                 $   0.31
Average number of common shares
  outstanding--diluted (000).............      106,814                                                  106,814
Diluted earnings per share of common
  stock..................................    $    0.34                                                 $   0.31
</TABLE>

                                       61
<PAGE>
                             TOUCH AMERICA HOLDINGS

              UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF INCOME

                          YEAR ENDED DECEMBER 31, 1999

<TABLE>
<CAPTION>
                                                                    PRO FORMA ADJUSTMENTS
                                                          -----------------------------------------
                                                             UTILITY
                                                           OPERATIONS     CONTINENTAL
                                           DECEMBER 31,   AND PREFERRED     ENERGY         QWEST      PRO FORMA
                                               1999        REDEMPTION     OPERATIONS    ACQUISITION    RESULTS
                                           ------------   -------------   -----------   -----------   ---------
                                              NOTE 1         NOTE 2         NOTE 3        NOTE 4
                                           ------------   -------------   -----------   -----------
                                                     (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                        <C>            <C>             <C>           <C>           <C>
Revenues.................................    $    812         $(694)         $(22)          $291      $    387

Expenses:
  Operations and maintenance.............         377          (342)           --            162           197
  Selling, general, and administrative...         115           (90)           (1)            62            86
  Taxes other than income taxes..........          72           (68)           --              1             5
  Depreciation, depletion, and
    amortization.........................          79           (70)           (1)            17            25
                                             --------         -----          ----           ----      --------
                                                  643          (570)           (2)           242           313
                                             --------         -----          ----           ----      --------

Income from continuing operations........         169          (124)          (20)            49            74

Interest expense and other income:
  Interest...............................          42           (39)           --             --             3
  Distributions on company obligated
    mandatorily redeemable preferred
    securities of subsidiary trust.......           5            (5)           --             --            --
  Other (income) deductions--net.........          (8)            6             6             --            (8)
                                             --------         -----          ----           ----      --------
                                                   39           (50)            6             --            (5)
                                             --------         -----          ----           ----      --------

Income taxes.............................          31           (10)           (8)            18            31
                                             --------         -----          ----           ----      --------

Net income from continuing operations....          99           (64)          (18)            31            48

Dividends on preferred stock.............           4            (1)           --             --             3
                                             --------         -----          ----           ----      --------

Net income available from continuing
  operations available for common
  stock..................................    $     95         $ (63)         $(18)          $ 31      $     45
                                             ========         =====          ====           ====      ========

Average number of common shares
  outstanding--basic (000)...............     109,795                                                  109,795

basic earnings per share of
  common stock...........................    $   0.86                                                 $   0.41

Average number of common shares
  outstanding--diluted (000).............     110,553                                                  110,553

Diluted earnings per share of common
  stock..................................    $   0.86                                                 $   0.41
</TABLE>

                                       62
<PAGE>
                             TOUCH AMERICA HOLDINGS

              UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF INCOME

                          YEAR ENDED DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                                   PRO FORMA ADJUSTMENTS
                                                                ---------------------------
                                                                   UTILITY
                                                                 OPERATIONS     CONTINENTAL
                                                 DECEMBER 31,   AND PREFERRED     ENERGY      PRO FORMA
                                                     1998        REDEMPTION     OPERATIONS     RESULTS
                                                 ------------   -------------   -----------   ---------
                                                    NOTE 1         NOTE 2         NOTE 3
                                                    (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                              <C>            <C>             <C>           <C>
Revenues.......................................    $    877       $    (686)      $    (91)   $    100

Expenses:
  Operations and maintenance...................         372            (344)            (1)         27
  Selling, general, and administrative.........          98             (70)            (2)         26
  Taxes other than income taxes................          67             (63)            --           4
  Depreciation, depletion, and amortization....          85             (72)            (6)          7
                                                   --------       ---------       --------    --------
                                                        622            (549)            (9)         64
                                                   --------       ---------       --------    --------
Income from continuing operations..............         255            (137)           (82)         36

Interest expense and other income:
  Interest.....................................          60             (51)            --           9
  Distributions on company obligated
    mandatorily redeemable preferred securities
    of subsidiary trust........................           5              (5)            --          --
  Other (income) deductions--net...............          (3)             (2)             4          (1)
                                                   --------       ---------       --------    --------
                                                         62             (58)             4           8
                                                   --------       ---------       --------    --------
Income taxes...................................          67             (26)           (31)         10
                                                   --------       ---------       --------    --------

Net income from continuing operations..........         126             (53)           (55)         18

Dividends on preferred stock...................           4              --             --           4
                                                   --------       ---------       --------    --------
Net income available from continuing operations
  available for common stock...................    $    122       $     (53)      $    (55)   $     14
                                                   ========       =========       ========    ========
Average number of common shares outstanding--
  basic (000)..................................     109,962                                    109,962
Basic earnings per share of common stock.......    $   1.11                                   $   0.13
Average number of common shares outstanding--
  diluted (000)................................     110,156                                    110,156
Diluted earnings per share of common stock.....    $   1.11                                   $   0.13
</TABLE>

                                       63
<PAGE>
                             TOUCH AMERICA HOLDINGS

              UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF INCOME

                          YEAR ENDED DECEMBER 31, 1997

<TABLE>
<CAPTION>
                                                                   PRO FORMA ADJUSTMENTS
                                                                ---------------------------
                                                                   UTILITY
                                                                 OPERATIONS     CONTINENTAL
                                                 DECEMBER 31,   AND PREFERRED     ENERGY      PRO FORMA
                                                     1997        REDEMPTION     OPERATIONS     RESULTS
                                                 ------------   -------------   -----------   ---------
                                                    NOTE 1         NOTE 2         NOTE 3
                                                    (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                              <C>            <C>             <C>           <C>
Revenues.......................................    $    696       $    (632)      $    (16)   $     48
Expenses:
  Operations and maintenance...................         307            (282)            (2)         23
  Selling, general, and administrative.........          92             (70)            (1)         21
  Taxes other than income taxes................          65             (63)            --           2
  Depreciation, depletion, and amortization....          69             (66)            --           3
                                                   --------       ---------       --------    --------
                                                        533            (481)            (3)         49
                                                   --------       ---------       --------    --------
Income from continuing operations..............         163            (151)           (13)         (1)
Interest expense and other income:
  Interest.....................................          54             (48)            --           6
  Distributions on company obligated
    mandatorily redeemable preferred securities
    of subsidiary trust........................           5              (5)            --          --
  Other (income) deductions--net...............         (22)              4              2         (16)
                                                   --------       ---------       --------    --------
                                                         37             (49)             2         (10)
                                                   --------       ---------       --------    --------
Income taxes...................................          48             (37)            (5)          6
                                                   --------       ---------       --------    --------
Net income from continuing operations..........          78             (65)           (10)          3
Dividends on preferred stock...................           4              --             --           4
                                                   --------       ---------       --------    --------
Net income available from continuing operations
  available for common stock...................    $     74       $     (65)      $    (10)   $     (1)
                                                   ========       =========       ========    ========
Average number of common shares
  outstanding--basic (000).....................     109,298                                    109,298
Basic earnings per share of common stock.......    $   0.68                                   $  (0.01)
Average number of common shares
  outstanding--diluted (000)...................     109,400                                    109,400
Diluted earnings per share of common stock.....    $   0.68                                   $  (0.01)
</TABLE>

                                       64
<PAGE>
                             TOUCH AMERICA HOLDINGS

                 UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET

                               SEPTEMBER 30, 2000

<TABLE>
<CAPTION>
                                                                                 UTILITY
                                                                               OPERATIONS     CONTINENTAL
                                                              SEPTEMBER 30,   AND PREFERRED     ENERGY
                                                                  2000*        REDEMPTION      SERVICES     PRO FORMA
                                                                 NOTE 1          NOTE 2         NOTE 3       RESULTS
                                                              -------------   -------------   -----------   ---------
                                                                               (MILLIONS OF DOLLARS)
<S>                                                           <C>             <C>             <C>           <C>
                                                       ASSETS
Current Assets:
  Cash and cash equivalents.................................     $    1          $    --        $    (1)     $   --
  Accounts receivable, net of allowance for doubtful
    accounts................................................        174              (71)            (1)        102
  Materials and supplies (principally at average cost)......         18              (13)            --           5
  Prepayments and other assets..............................         62              (41)            (1)         20
  Deferred income taxes.....................................          9               (6)            (1)          2
  Investment in discontinued companies......................        335              388              5         728
                                                                 ------          -------        -------      ------
                                                                    599              257              1         857
Property Plant and Equipment:
  Plant, less accumulated depreciation, depletion and
    amortization............................................      1,541           (1,093)            --         448
                                                                 ------          -------        -------      ------
                                                                  1,541           (1,093)            --         448
Other Assets:
  Intangibles, net of amortization..........................        157               (8)            --         149
  Telecommunications investments............................         43               --             --          43
  Other investments.........................................         56              (25)           (23)          8
  Regulatory assets related to income taxes.................         61              (61)            --          --
  Regulatory assets--other..................................        149             (149)            --          --
  Deferred income taxes.....................................        101               --             --         101
  Other.....................................................          9               (9)            --          --
                                                                 ------          -------        -------      ------
                                                                    576             (252)           (23)        301
                                                                 ------          -------        -------      ------
    Total Assets............................................     $2,716          $(1,088)       $   (22)     $1,606
                                                                 ------          -------        -------      ------
                                        LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities:
  Accounts payable..........................................     $   71          $    (7)       $    --      $   64
  Dividends payable.........................................         25              (25)            --          --
  Income taxes payable......................................         20                7             (9)         18
  Other taxes payable.......................................         43              (40)            --           3
  Short-term borrowing......................................        109               --             --         109
  Current portion of deferred revenue.......................         25               --             --          25
  Long-term debt due within one year........................         78              (64)           (11)          3
  Interest accrued..........................................          8               (8)            --          --
  Other current liabilities.................................        108             (102)            (1)          5
                                                                 ------          -------        -------      ------
                                                                    487             (239)           (21)        227
                                                                 ------          -------        -------      ------
Long-Term Liabilities:
  Deferred income taxes.....................................         89              (88)            (1)         --
  Investment tax credits....................................         13              (13)            --          --
  Deferred revenue..........................................        249              (45)            --         204
  Net proceeds from the generation sale.....................        215             (215)            --          --
  Other deferred credits....................................        114             (104)            --          10
                                                                 ------          -------        -------      ------
                                                                    680             (465)            (1)        214
                                                                 ------          -------        -------      ------
Long-Term Debt:
  Long-term debt............................................        394             (297)            --          97
  Company obligated mandatorily redeemable preferred
    securities of trust.....................................         65              (65)            --          --
                                                                 ------          -------        -------      ------
                                                                    459             (362)            --          97
                                                                 ------          -------        -------      ------
Shareholders' Equity
  Preferred stock...........................................         58              (22)            --          36
  Common stock..............................................        704               --             --         704
  Treasury stock............................................       (145)              --             --        (145)
  Unallocated stock held by trustee for retirement savings
    plan....................................................        (18)              --             --         (18)
  Retained earnings.........................................        511               --             --         511
  Accumulated other comprehensive income....................        (20)              --             --         (20)
                                                                 ------          -------        -------      ------
                                                                  1,090              (22)            --       1,068
                                                                 ------          -------        -------      ------
    Total Liabilities and Shareholders' Equity..............     $2,716          $(1,088)       $   (22)     $1,606
</TABLE>

----------------------------------

*   We have made certain reclassifications and adjustments to the September 30,
    2000 amounts as filed with the SEC on November 14, 2000. These changes had
    no significant effect on previously reported results of operations or
    shareholders' equity.

                                       65
<PAGE>
                        NOTES TO THE UNAUDITED PRO FORMA
                       CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1--PRO FORMA INCOME STATEMENTS AND BALANCE SHEET

    The unaudited pro forma consolidated statements of income for the years
ended December 31, 1999, 1998, and 1997 begin with the consolidated financial
statements from our audited consolidated financial statements as of
December 31, 1999 and 1998 and for each of the three years in the period ended
December 31, 1999, as adjusted retroactively to report MPC's coal businesses and
oil and natural gas businesses as discontinued operations. These adjusted
consolidated financial statements are included in this proxy
statement/prospectus. The September 30, 2000 unaudited pro forma consolidated
statement of income and balance sheet begin with the consolidated financial
statements from our Form 10-Q filed with the SEC on November 14, 2000. These
consolidated financial statements also reflect discontinued operations
accounting treatment for oil and natural gas operations and coal operations. We
entered into a definitive agreement to sell our oil and natural gas operations
on August 25, 2000 and a definitive agreement to sell our coal operations on
September 15, 2000. Both agreements are subject to customary closing conditions.
We applied discontinued operations accounting treatment to both of these
operations effective September 1, 2000.

NOTE 2--UTILITY OPERATIONS AND REDEMPTION OF PREFERRED STOCK

    UTILITY OPERATIONS

    The "Utility Operations and Preferred Redemption" column of Touch America
Holdings' unaudited pro forma consolidated statements of income and balance
sheet reflects the removal of the utility operations, as a result of the sale of
the utility business to NorthWestern, including Colstrip Unit 4, solicited in
this proxy statement/prospectus. These adjustments exclude indirect general
corporate overhead costs associated with, but not directly attributable to, the
utility operations. In accordance with generally accepted accounting principles,
these expenses must remain with continuing operations and, therefore, are
classified as part of Touch America Holdings' operating results. In addition,
these adjustments include an income tax provision calculated on the statutory
rate as if the utility operations were on a stand alone basis.

    REDEMPTION OF PREFERRED STOCK

    We have reduced preferred dividends on the unaudited pro forma consolidated
statements of income and preferred stock on the unaudited pro forma consolidated
balance sheet to reflect the redemption of the Preferred Stock, $6.00 Series and
Preferred Stock, $4.20 Series, solicited in this proxy statement/prospectus. For
this unaudited pro forma financial statement presentation, we assumed that
existing cash was used to redeem the preferred stock. However, upon shareholder
approval, the proceeds used to redeem the preferred stock will be a portion of
the proceeds received from the sale of our energy businesses.

NOTE 3--CONTINENTAL ENERGY SERVICES, INC.

    The "Continental Energy Services" column of Touch America Holdings'
unaudited pro forma consolidated statements of income and balance sheet reflects
the removal of Continental Energy Services, Inc., or Continental Energy,
operations. Historically, both Continental Energy and Colstrip Unit 4 comprised
the independent power group segment. Because Colstrip Unit 4 is included in the
sale of the utility business to NorthWestern, which requires shareholder
approval solicited in this statement/prospectus, the entire independent power
group segment was not previously afforded discontinued operations accounting
treatment. Since this unaudited pro forma presentation illustrates the effect of
the proposed sale of the utility business to NorthWestern, Continental Energy
has been

                                       66
<PAGE>
                        NOTES TO THE UNAUDITED PRO FORMA
                 CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 3--CONTINENTAL ENERGY SERVICES, INC. (CONTINUED)
afforded discontinued operations accounting treatment. This discontinuance is
reflected by the removal of Continental Energy's operations, excluding indirect
general corporate overhead costs associated with, but not directly attributable
to, Continental Energy's operations. As discussed above, these expenses must
remain with continuing operations and, therefore, are classified as part of
Touch America Holdings' operating results. In addition, these adjustments
include an income tax provision calculated on the statutory rate as if
Continental Energy was on a stand alone basis. The sale of Continental Energy is
expected to close in January 2001.

NOTE 4--ACQUISITION OF PROPERTIES FROM QWEST

    The "Qwest Acquisition" column of Touch America Holdings' unaudited pro
forma consolidated statement of income adjustments for the year ended
December 31, 1999 and the nine months ended September 30, 2000 reflects the
acquisition of Qwest's divested businesses accounted for under purchase
accounting methodology. These amounts, representing the operating results and
financial position of Qwest's divested businesses, along with applicable pro
forma adjustments, were included in our Form 8-K/A filed with the SEC on
September 15, 2000.

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<PAGE>
              DESCRIPTION OF TOUCH AMERICA HOLDINGS' CAPITAL STOCK

    The following summary of the capital stock of Touch America Holdings is
subject in all respects to the applicable provisions of Delaware General
Corporation Law and the Touch America Holdings' certificate of incorporation to
be in effect on the effective date of the merger. See "Comparison of Shareholder
Rights" below on page 71 and "Where You Can Find More Information" below on
page 79.

GENERAL

    The total number of authorized shares of capital stock of Touch America
Holdings consists of 240 million shares of common stock, $.01 par value, and
5 million shares of preferred stock, $.01 par value.

COMMON STOCK

    Subject to the rights of any holders of preferred stock of Touch America
Holdings, if any, each holder of common stock will be entitled to cast one vote
for each share held of record on all matters submitted to a vote of the
shareholders, including the election of directors. Holders of common stock will
be entitled to receive dividends or other distributions as declared by the Touch
America Holdings' Board of Directors at its own discretion. The right of the
Touch America Holdings' Board of Directors to declare dividends, however, will
be subject to the rights of any holders of preferred stock, if any, of Touch
America Holdings and certain requirements of Delaware law. Pursuant to the Touch
America Holdings' Shareholder Protection Rights Plan, holders of Touch America
Holdings' common stock will be deemed to receive one Touch America Holdings
preferred share right for each outstanding common share. See "Comparison of
Shareholder Rights--Shareholder Rights Plan" below on page 78.

PREFERRED STOCK

    The Touch America Holdings' Board of Directors has the full authority
permitted by law to issue the preferred stock in one or more classes or series
and, with respect to each class or series, to determine the voting powers, if
any, and the preferences and relative, participating, optional or other special
rights, if any, and any qualifications, limitations or restrictions thereof, of
the shares of any class or series of preferred stock, except that holders of
preferred stock will not be entitled to more than one vote for each share of
preferred stock held. The powers, preferences and relative, participating,
optional and other special rights of each class or series of preferred stock and
the qualifications, limitations or restrictions, if any, thereof may differ from
those of any other classes or series at any time outstanding. The Touch America
Holdings' Board of Directors shall determine the extent, if any, of which the
holders of preferred stock shall be entitled to vote as a class or otherwise
with respect to the election of directors or otherwise.

    At this time, the Board of Touch America Holdings has authorized and issued
one series of preferred stock--the Touch America Holdings' Preferred Stock,
$6.875 Series (which is identical to the Preferred Stock, $6.975 Series). The
Touch America Holdings' Preferred Stock, $6.875 Series consists of 360,800
shares of which 360,800 are issued and outstanding, and has the relative rights,
preferences and limitations as set forth in Touch America Holdings' Certificate
of Incorporation.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series will be deemed to receive in the
merger one share of Touch America Holdings' Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, for each outstanding share of Preferred Stock
$4.20 Series and Preferred Stock $6.00 Series, respectively. The terms of the
Touch America Holdings' Preferred Stock, $4.20 Series and Preferred Stock, $6.00
Series will be identical to the terms of the Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, respectively.

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<PAGE>
    TOUCH AMERICA HOLDINGS' PREFERRED STOCK, $6.875 SERIES

    The dividend rate of this stock is $6.875 per share per annum. Quarterly
periods ending January 31, April 30, July 31 and October 31 of each year have
been established as the regular dividend periods with dividends for such periods
payable, in arrears, on February 1, May 1, August 1, and November 1 of each
year. Dividends on the Touch America Holdings' Preferred Stock, $6.875 Series
shall be cumulative from the date of original issue.

    The Touch America Holdings' Preferred Stock, $6.875 Series will not be
redeemable prior to November 1, 2003. The shares are redeemable, at the option
of Touch America Holdings, in whole or in part, at any time upon not less than
thirty (30) days' notice, on and after November 1, 2003. The redemption prices
per share is set forth below, plus, in each case, accumulated but unpaid
dividends to the date of redemption:

<TABLE>
<CAPTION>
REDEMPTION PERIOD                                              PRICE
-----------------                                             --------
<S>                                                           <C>
November 1, 2003 to October 31, 2004........................  $103.438
November 1, 2004 to October 31, 2005........................  $103.094
November 1, 2005 to October 31, 2006........................  $102.750
November 1, 2006 to October 31, 2007........................  $102.406
November 1, 2007 to October 31, 2008........................  $102.063
November 1, 2008 to October 31, 2009........................  $101.719
November 1, 2009 to October 31, 2010........................  $101.375
November 1, 2010 to October 31, 2011........................  $101.031
November 1, 2011 to October 31, 2012........................  $100.688
November 1, 2012 to October 31, 2013........................  $100.344
November 1, 2013 and thereafter.............................  $100.000
</TABLE>

    The amount of $100 per share shall be paid to the holders of the Touch
America Holdings' Preferred Stock, $6.875 Series in the event of any
liquidation, dissolution or winding up of the affairs of Touch America Holdings
or any distribution of its capital, whether voluntary or involuntary, before any
distribution or payment shall be made to the holders of common stock, plus
accumulated but unpaid dividends.

    The holders of the Touch America Holdings' Preferred Stock, $6.875 Series
are entitled to receive dividends when and as declared by the Touch America
Holdings' Board of Directors. This dividend is cumulative. Dividends may be paid
upon the common shares of Touch America Holdings only after dividends have been
paid on the Touch America Holdings' Preferred Stock, $6.875 Series

    In the event of any liquidation, dissolution or winding up of the affairs of
Touch America Holdings or any distribution of capital, whether voluntary or
involuntary, the holders of the Touch America Holdings Preferred Stock, $6.875
Series at the time outstanding are entitled to be paid the amount fixed by the
Touch America Holdings' Board of Directors, before any distribution or payment
shall be made to the holders of common shares, but are not entitled to receive
any other distributive amounts upon the liquidation, dissolution or winding up
of the affairs of Touch America Holdings.

    A consolidation, merger or amalgamation of Touch America Holdings with or
into any other corporation or corporations shall not be deemed a distribution of
assets of Touch America Holdings within the meaning of any of the provisions of
the Touch America Holdings' Preferred Stock, $6.875 Series.

    Except as set forth below, each holder of record of the Touch America
Holdings' Preferred Stock, $6.875 Series shall be entitled to one vote for each
share of stock held by such stockholder. The holders of the Touch America
Holdings' Preferred Stock, $6.875 Series are not entitled to notice of or to
vote at any annual or special meeting of shareholders called for the purpose of
redeeming the whole

                                       69
<PAGE>
or any part of the Touch America Holdings' Preferred Stock, $6.875 Series. At
all elections for directors, each holder of the Touch America Holdings'
Preferred Stock, $6.875 Series is entitled to as many votes as shall equal the
number of such stockholder's Touch America Holdings' Preferred Stock, $6.875
Series multiplied by the number of directors to be elected, and may cast all of
such votes in person or by proxy for a single director, or may distribute them
among the number to be voted for, or any two or more of them as he or she may
see fit.

                                       70
<PAGE>
                        COMPARISON OF SHAREHOLDER RIGHTS

    Upon completion of the merger, MPC's shareholders will be deemed to receive
shares of common stock of Touch America Holdings, par value $.01 per share, in
exchange for their MPC common shares, no par value, and shares of preferred
stock of Touch America Holdings, par value $.01 per share, in exchange for their
MPC preferred shares, no par value. The following is a summary of the material
differences with respect to the rights of holders of Touch America Holdings'
common shares and preferred shares and MPC common shares and preferred shares.
These differences arise from the differences between various provisions of
Montana and Delaware law, as well as, differences between the governing
instruments of MPC and Touch America Holdings.

    The following description summarizes the material differences which may
affect the rights of a MPC shareholder, but does not purport to be a complete
statement of all of the differences or a complete description of the specific
provisions referred to in this summary. The identification of specific
differences is not intended to indicate that other equal or more significant
differences do not exist.

    The terms of the Touch America Holdings' Preferred Stock, $6.875 Series will
have the identical rights, title and preferences as the Preferred Stock, $6.875
Series of MPC.

    If the redemption of the preferred stock is not approved by at least a
majority of all of our common shareholders, each shareholder of Preferred Stock,
$4.20 Series and Preferred Stock, $6.00 Series will be deemed to receive in the
merger one share of Touch America Holdings' Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, for each outstanding share of Preferred Stock
$4.20 Series and Preferred Stock $6.00 Series, respectively. The terms of the
Touch America Holdings' Preferred Stock, $4.20 Series and Preferred Stock, $6.00
Series will be identical to the terms of the Preferred Stock, $4.20 Series and
Preferred Stock, $6.00 Series, respectively.

CORPORATE GOVERNANCE

    MPC: The rights of MPC's shareholders are currently governed by Montana law
and the articles of incorporation and by-laws of MPC. Upon completion of the
merger, the rights of MPC's shareholders who become Touch America Holdings'
shareholders will be governed by Delaware law, the Touch America Holdings'
certificate of incorporation and the Touch America Holdings' by-laws.

    TOUCH AMERICA HOLDINGS: The rights of Touch America Holdings' shareholders
will be governed by Delaware law and the certificate of incorporation and
by-laws of Touch America Holdings.

AUTHORIZED CAPITAL STOCK

    MPC: The authorized capital stock of MPC consists of 240 million common
shares and 5 million preferred shares.

    TOUCH AMERICA HOLDINGS: The authorized capital stock of Touch America
Holdings consists of 240 million shares of common stock and 5 million shares of
preferred stock.

NUMBER OF DIRECTORS

    MPC: Under Montana law, a corporation may have one or more directors on its
board of directors. The articles of incorporation, by-laws or an action by the
shareholders, or an action of the Board of Directors under the specific
provisions of a by-law adopted by the shareholders, may fix the number of
directors. Further, the articles of incorporation or by-laws may establish a
variable range for the size of the Board of Directors. If a variable range is
established, the number of directors within the variable range may be
established by the shareholders or the Board of Directors.

                                       71
<PAGE>
    The articles of incorporation of MPC provides that the number of directors
shall be fixed in the by-laws, but may not be more than 18 nor less than 3. The
by-laws currently fix the number of directors at 11. The articles also provide
that the shareholders may change the number of directors by a two-thirds vote.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a corporation may have one or
more directors on its Board of Directors. The number of directors will be fixed
by, or in the manner described in, the by-laws, unless the certificate of
incorporation fixes the number.

    Under the Touch America Holdings' by-laws, the Board of Directors shall
consist of no more than 15 nor less than 5, and the Board of Directors may
increase or decrease the number of directors by a resolution adopted by a
majority of the Board of Directors. However, no such decrease in the number of
directors may shorten the term of any incumbent director. The initial directors
of Touch America Holdings will be the same as the current directors of MPC.

CLASSIFIED BOARD

    MPC: Under Montana law, if a corporation has nine or more directors, then
the articles of incorporation or the by-laws may provide for the election of
directors by staggering (or classifying) their terms by dividing the total
number of directors into two or three groups, with each group containing as near
as possible to one-half or one-third of the total. In that event, the terms of
directors in the first group expire at the first annual shareholders' meeting
after their election, the terms of the second group expire at the second annual
shareholders' meeting after their election, and the terms of the third group, if
any, expire at the third annual shareholders' meeting after the election.

    The by-laws of MPC provide for a classified board of directors. The articles
also provide that the shareholders can only change the staggered system by a
two-third vote.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a corporation may divide its
directors into one, two or three classes, with the term of office of those of
the first class to expire at the annual meeting next ensuing, the term of the
second class one year thereafter and the term of the third class two years
thereafter. At each annual election held after such classification and election,
directors shall be chosen for a full term, as the case may be, to succeed those
whose terms expire.

    The articles of incorporation and by-laws of Touch America Holdings provide
for directors to be divided into three classes, with directors to be elected
from each class in 2001, 2002 and 2003, respectively.

CUMULATIVE VOTING

    MPC: Under Montana law, shareholders do have cumulative voting rights for
the election of directors, unless the corporation's article of incorporation
provides otherwise.

    The articles of incorporation of MPC provide that shareholders have
cumulative voting rights for the election of directors.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a corporation's certificate of
incorporation may provide for cumulative voting rights for the election of
directors.

    The articles of incorporation of Touch America Holdings do not provide for
cumulative voting by shareholders.

VACANCIES ON THE BOARD

    MPC: Under Montana law, either the Board of Directors or the shareholders
may fill newly-created directorships and vacancies, including a vacancy
resulting from an increase in the number of

                                       72
<PAGE>
directors. If the members of the Board of Directors remaining in office
constitute fewer than a quorum of the Board of Directors, they may fill the
vacancy by the affirmative vote of a majority of all the directors remaining in
office. If the vacant office was held by a director elected by a voting group of
shareholders, only the holders of shares of that voting group are entitled to
vote to fill the vacancy if it is filled by the shareholders. The articles of
incorporation or by-laws may provide that newly-created directorships or
vacancies will be filled by vote of the shareholders.

    The by-laws of MPC provide that only the MPC Board may fill vacancies on the
board at any meeting where a quorum is present. If the directors remaining in
office are fewer than a quorum, they may fill the vacancy by an affirmative vote
of the majority of remaining directors.

    TOUCH AMERICA HOLDINGS: Under Delaware law, any vacancy occurring in any
office of the corporation by death, resignation, removal or otherwise will be
filled as set forth in the by-laws. In the absence of a provision in the by-laws
specifying how vacancies will be filled, vacancies and newly-created
directorships may be filled by a majority of the directors then in office. Any
director chosen pursuant to this provision will hold office until the next
election of the class for which the director is chosen to fill a vacancy, and
until his or her successor is elected and qualified.

    The certificate of incorporation of Touch America Holdings provides that,
except as otherwise set forth in the certificate of incorporation with respect
to the rights of the holders of preferred shares, any vacancy on the Board of
Directors and any newly created directorship resulting from any increase in the
authorized number of directors will be filled only by the majority vote of the
directors then in office. A director chosen to fill a vacancy will hold office
until a successor is duly elected and qualified, or until his or her earlier
death, incapacity, resignation or removal from office.

REMOVAL OF DIRECTORS

    MPC: Under Montana law, shareholders may remove directors with or without
cause unless the articles of incorporation provide that directors may be removed
only for cause. If a director is elected by a voting group of shareholders only
the shareholders of that voting group may participate in the vote to remove the
director. Any director or the entire Board of Directors may be removed only by a
vote of the holders of two-thirds of the shares entitled to vote at an election
of directors, unless otherwise provided by the articles of incorporation or
by-laws. If shareholders have the right to cumulative voting for the election of
directors and if less than the entire Board of Directors is to be removed, a
director may not be removed if the votes cast against the director's removal
would be sufficient to elect him if cumulatively voted at an election of the
entire Board of Directors. A director may be removed by shareholders only at a
meeting called for the purpose of removing the director.

    The by-laws of MPC provide that the shareholders may remove a director and
fill the vacancy with a two-thirds vote of the outstanding shares entitled to
vote. If less than the entire MPC Board is to be removed, no director may be
removed if the votes cast against the director's removal would be sufficient to
elect the director if cumulatively voted at an election of the class of
directors of which the director is a part.

    TOUCH AMERICA HOLDINGS: Under Delaware law, any director may be removed,
with or without cause, by the holders of a majority of the shares entitled to
vote at an election of the directors. However, unless the certificate of
incorporation provides otherwise, in the case of a corporation whose Board of
Directors is classified, shareholders may remove directors only for cause.

    The certificate of incorporation of Touch America Holdings provides that
directors may be removed only for cause and only by the affirmative vote of at
least 80 percent of shareholders entitled to vote.

                                       73
<PAGE>
VOTE REQUIRED FOR SHAREHOLDER ACTIONS

    MPC: Under Montana law, directors of a corporation will be elected by a
plurality of the votes cast at a shareholder meeting by the holders of shares
entitled to vote in the election, unless otherwise set forth in the certificate
of incorporation. Except as otherwise set forth under Montana law, all other
matters brought before a shareholder meeting require the authorization of a
majority of the votes cast in favor or against those matters by the holders of
shares entitled to vote at that meeting.

    The articles of incorporation of MPC provide that the holder of each share
of preferred or common stock is entitled to one vote for each share, except
(1) holders of preferred are not entitled to vote on the redemption of any
preferred shares, and (2) in elections for directors, each holder of preferred
or common shares is entitled to the number of shares multiplied by the number of
directors to be elected, and those votes may be cast among the nominees as the
holder sees fit.

    TOUCH AMERICA HOLDINGS: Under Delaware law, directors of a corporation will
be elected by a plurality of the votes of the shares present in person or
represented by proxy at a shareholder meeting and entitled to vote in the
election, unless otherwise set forth in the certificate of incorporation or the
by-laws. Except as otherwise required by Delaware law or by the certificate of
incorporation or by-laws, all other matters brought before a shareholder meeting
require the affirmative vote of the majority of shares present in person or
represented by proxy at a shareholder meeting and entitled to vote at that
meeting.

    The by-laws of Touch America Holdings provide that, except as otherwise
required by the certificate of incorporation or applicable law, the directors of
Touch America Holdings will be elected by a plurality vote and that all other
questions will be decided by a majority vote of the shareholders. The
certificate of incorporation of Touch America Holdings and Delaware law do not
require a vote other than a plurality vote for the election of directors and a
majority vote for all other questions decided by the shareholders. At all
elections for directors, each holder of the Touch America Holdings' Preferred
Stock, $6.875 Series is entitled to as many votes as shall equal the number of
his Touch America Holdings' Preferred Stock, $6.875 Series multiplied by the
number of directors to be elected, and may cast all of such votes in person or
by proxy for a single director, or may distribute them among the number to be
voted for, or any two or more of them as he or she may see fit.

SHAREHOLDER ACTION BY WRITTEN CONSENT

    MPC: Under Montana law, shareholders may act without a meeting on any action
requiring a vote of shareholders if they have the written consent of the holders
of all shares entitled to vote on the matter. The action must be evidenced by
one or more written consents describing the action taken, signed by all
shareholders entitled to vote on the action.

    The articles of incorporation and the by-laws of MPC do not address the
subject of shareholder action by written consent.

    TOUCH AMERICA HOLDINGS: Under Delaware law, unless otherwise set forth in a
corporation's certificate of incorporation, holders of shares, representing the
minimum number of votes that would be necessary to authorize or take such action
at a meeting at which all shares having a right to vote thereon were present and
voted, may act by written consent.

    The certificate of incorporation of Touch America Holdings provides that any
action taken by the shareholders must be effected at a duly called annual or
special meeting of the shareholders and may not be effected by the written
consent of the shareholders.

SPECIAL MEETINGS OF SHAREHOLDERS

    MPC: Under Montana law, a corporation shall hold a special meeting of
shareholders on the call of its Board of Directors or any other person
authorized by the certificate of incorporation or by-laws

                                       74
<PAGE>
or the holders of at least 10% of all the votes entitled to be cast on any issue
proposed to be considered at the proposed special meeting.

    The by-laws of MPC provide that a special meeting of the shareholders may be
held in Butte, Montana by the call of the MPC Board, chairman of the MPC Board,
vice chairman of the MPC Board, chief executive officer, president or holders of
at least ten percent of the shares outstanding and entitled to vote at the
meeting.

    TOUCH AMERICA HOLDINGS: Under Delaware law, special meetings may be called
by the Board of Directors or by those persons authorized to call a special
meeting by the certificate of incorporation or by-laws of the corporation.

    The by-laws of Touch America Holdings provide in pertinent part that,
subject to the rights of any series of preferred stock, and except as otherwise
expressly required by the certificate of incorporation or by applicable law, a
special meeting may be called only by the Chairman of the Board of Directors for
any purpose or by a majority vote of the entire Board of Directors.

AMENDMENTS TO GOVERNING DOCUMENTS

    MPC: Under Montana law, a corporation may amend its articles of
incorporation at any time to add or change a provision that is required or
permitted in the articles of incorporation or to delete a provision not required
in the articles of incorporation. Under Montana law, unless the articles of
incorporation provide otherwise, a corporation's board of directors may adopt
certain amendments to the corporation's articles of incorporation. Montana law
also provides that a corporation's board of directors may propose certain
amendments to the articles of incorporation for submission to the shareholders.
Proposed amendments to the articles submitted to shareholders must be approved
by a majority of the votes entitled to vote on the amendment. Montana law also
provides that a corporation's Board of Directors may amend or repeal a
corporation's bylaws unless: (1) the articles of incorporation reserve that
right exclusively for shareholders; (2) the shareholders in amending, adding, or
repealing a particular by-law express that the Board of Directors may not amend
or repeal that by-law. Shareholders may also amend or repeal bylaws, even though
the Board of Directors also has that power.

    The articles of incorporation of MPC do not address amendment of the
articles, but do provide that the shareholders may amend the by-laws. The
by-laws also provide that the MPC Board may amend the by-laws.

    TOUCH AMERICA HOLDINGS: Under Delaware law, unless the certificate of
incorporation otherwise provides, the certificate of incorporation of a
corporation may be amended upon the vote of the Board of Directors and the
affirmative vote of a majority of the outstanding stock entitled to vote thereon
and a majority of the outstanding stock of each class entitled to vote thereon
as a separate class (e.g., if the proposed amendment would adversely affect the
preferences or priorities of that class). Also, unless the certificate of
incorporation otherwise provides, the by-laws of a corporation may be amended by
the vote of a majority of the shares entitled to vote thereon that are present
in person or by proxy at a shareholders meeting. The Board of Directors of a
corporation is authorized to alter, amend, repeal or adopt the by-laws by a
majority vote of the Board of Directors if so provided in the certificate of
incorporation.

    Touch America Holdings' certificate of incorporation reserves the right to
supplement, amend or repeal any provision of the certificate of incorporation in
the manner prescribed by Delaware law and the certificate of incorporation. The
certificate of incorporation and the by-laws of Touch America Holdings provide
that the Board of Directors is authorized to alter, amend, repeal or adopt the
by-laws by a majority vote of the entire Board of Directors.

                                       75
<PAGE>
PREEMPTIVE RIGHTS

    MPC: Under Montana law, shareholders do not have the preemptive right to
acquire the corporation's unissued shares, except to the extent provided for in
the articles of incorporation.

    The articles of incorporation of MPC do not provide for preemptive rights.

    TOUCH AMERICA HOLDINGS: Under Delaware law, absent an express provision in a
corporation's certificate of incorporation, a shareholder does not possess
preemptive rights to subscribe to an additional issue of stock.

    The certificate of incorporation of Touch America Holdings does not provide
for preemptive rights.

INDEMNIFICATION OF DIRECTORS, OFFICERS, EMPLOYEES AND AGENTS

    MPC: Montana law provides for mandatory indemnification of a director or
officer who has been wholly successful, on the merits or otherwise, in the
defense of any proceeding to which the director was made a party because he is
or was a director or officer of the corporation unless modified by the articles
of incorporation. Montana law also provides for discretionary indemnification by
a corporation of a director, officer or employee subject to certain statutory
requirements, unless the articles of incorporation provide otherwise.

    The by-laws of MPC provide that MPC shall indemnify directors and officers
of MPC as provided by the Montana law described in the preceding paragraph.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a corporation may indemnify its
officers, directors, employees and agents against liabilities and expenses
incurred in proceedings if the person acted in good faith and in a manner he or
she reasonably believed to be in, or not opposed to, the best interests of the
corporation and, with respect to any criminal action, had no reasonable cause to
believe that the person's conduct was unlawful. In the case of derivative
actions, indemnification is limited to expenses and no indemnification may be
made in respect of any claim as to which the person is adjudged liable to the
corporation except as otherwise authorized by a court.

    The by-laws of Touch America Holdings provide that, except to the extent
indemnification is not permitted by law, Touch America Holdings will fully
indemnify its directors and officers and provide for the advancement of expenses
in connection with any proceeding.

LIMITATION ON DIRECTOR LIABILITY

    MPC: Under Montana law, a corporation may include in its articles of
incorporation a provision eliminating or limiting the liability of a director to
the corporation or its shareholders for money damages for any actions taken or
any failure to act except for: (1) the amount of financial benefit received by a
director to which the director is not entitled; (2) an intentional infliction of
harm on the corporation or the shareholders; (3) making an unlawful
distribution; or (4) an intentional violation of criminal law.

    The articles of incorporation of MPC include a provision eliminating
personal liability of directors to MPC or its shareholders, except in the four
cases established by Montana law as described in the preceding paragraph.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a corporation may include in its
certificate of incorporation a provision eliminating the liability of a director
to the corporation or its shareholders for monetary damages for a breach of the
director's fiduciary duties, except liability for any breach of the director's
duty of loyalty to the corporation's shareholders, for acts or omissions not in
good faith or that involve intentional misconduct or knowing violation of law,
under Section 174 of the Delaware Law (which deals generally with unlawful
payments of dividends, stock repurchases and redemptions), and for any
transaction from which the director derived an improper personal benefit.

                                       76
<PAGE>
    The certificate of incorporation of Touch America Holdings provides that,
except to the extent limitation of liability is not permitted by law, the
directors of Touch America Holdings will not be personally liable to Touch
America Holdings or its shareholders for monetary damages due to any breach of
fiduciary duty.

BUSINESS COMBINATIONS

    MPC: Under Montana law, unless a corporation's articles of incorporation
provide for a lesser vote (but not less than a majority), approval by at least
two-thirds of the outstanding shares entitled to vote or two-thirds of each
voting group is required to approve mergers, asset sales and dissolutions.
Separate voting by voting groups is required (1) on a plan of share exchange,
and (2) on a plan of merger if it contains provisions that would require
separate voting if contained in an amendment to the articles of incorporation.

    The articles of incorporation of MPC expressly provide that certain business
combinations must be approved by at least 70 percent of the outstanding shares
of MPC. The 70 percent voting requirement is not applicable if certain
conditions are satisfied, including a fair price as defined in the articles of
incorporation.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a merger or consolidation of a
corporation or the sale of all or substantially all of the assets of a
corporation requires authorization by a resolution adopted by the holders of a
majority of the outstanding stock of the corporation entitled to vote, unless
the certificate of incorporation requires a greater vote.

    The certificate of incorporation and by-laws of Touch America Holdings do
not address business combinations.

DISSENTERS' OR APPRAISAL RIGHTS

    MPC: Under Montana law, a shareholder is entitled to dissent from, and, upon
completion of various notice and demand requirements prescribed in Sections
35-1-826 through 35-1-839 of the Montana Business Corporation Act, to obtain the
fair value of his or her shares in the event of certain corporate actions,
including certain mergers, share exchanges, sales of substantially all assets of
the corporation, and certain amendments to the corporation's articles of
incorporation. See "The Restructuring--Dissenters' Rights."

    TOUCH AMERICA HOLDINGS: Under Delaware law, a shareholder may dissent from,
and receive payment in cash for the fair value of its shares in the event of,
certain mergers and consolidations. However, under Delaware law and subject to
the following paragraph, appraisal rights are generally not available:

    - for shares listed on a national securities exchange;

    - for shares designated as a national market system security on an
      interdealer quotation system by the National Association of Securities
      Dealers;

    - for shares which are held of record by more than 2,000 shareholders; or

    - to shareholders of the surviving corporation if the merger did not require
      for its approval the vote of the shareholders of the surviving
      corporation.

    Notwithstanding the foregoing, appraisal rights are available if
shareholders are required by the terms of the merger agreement to accept for
their shares anything other than:

    - shares of stock of the surviving corporation;

    - shares of stock of another corporation that are listed on a national
      securities exchange, designated as a national market system security as
      described above, or held of record by more than 2,000 shareholders;

    - cash instead of fractional shares of stock; or

                                       77
<PAGE>
    - any combination of the above.

    Appraisal rights are also available under Delaware law in certain other
circumstances including:

    - in certain parent-subsidiary corporation mergers, and

    - in certain circumstances where the certificate of incorporation so
      provides.

    The certificate of incorporation of Touch America Holdings does not grant
additional appraisal rights.

ANTI-TAKEOVER STATUTES

    MPC: Montana law does not have an anti-takeover statute.

    TOUCH AMERICA HOLDINGS: Under Delaware law, a Delaware corporation is
prohibited from engaging in mergers, dispositions of 10% or more of its assets,
and issuances of stock to and other transactions ("business combinations") with
a person or group that owns 15% or more of the voting stock of the corporation
(an "interested shareholder"), for a period of three years after the interested
shareholder crosses the 15% threshold. These restrictions do not apply in
certain circumstances, including when:

    - prior to the person or group becoming an interested shareholder, the Board
      of Directors approved the business combination in question or the
      transaction that resulted in the person or group becoming an interested
      shareholder;

    - the interested shareholder acquired at least 85% of the voting stock of
      the corporation (other than stock owned by inside directors and certain
      employee stock plans) in the transaction in which the interested
      shareholder crossed the 15% threshold; or

    - after the person or group became an interested shareholder, the Board of
      Directors and at least 66 2/3% of the voting stock other than stock owned
      by the interested shareholder approved the business combination.

SHAREHOLDER RIGHTS PLAN

    MPC: MPC has a Shareholder Protection Rights Plan that provides one MPC
preferred share purchase right on each outstanding MPC common share. Each
purchase right entitles the registered holder, upon the occurrence of certain
events, to purchase from MPC one one-hundredth of a share of Participating
Preferred Shares, A Series, without par value. If it should become exercisable,
each purchase right would have economic terms similar to one share of common
stock. The purchase rights trade with the underlying shares and will, except
under certain circumstances described in the Shareholder Protection Rights Plan,
expire on June 6, 2009, unless redeemed earlier or exchanged by MPC.

    TOUCH AMERICA HOLDINGS: Touch America Holdings will institute a Shareholder
Protection Rights Plan between the effective date of Touch America Holdings'
registration statement on Form S-4 and the effective time of the merger which
will be identical to the MPC Shareholder Protection Rights Plan.

                                 LEGAL MATTERS

    The validity of the Touch America Holdings' stock offered by this proxy
statement/prospectus will be passed upon for Touch America Holdings by Milbank,
Tweed, Hadley & McCloy LLP, New York, New York.

                                    EXPERTS

    The consolidated balance sheets of MPC as of December 31, 1999 and 1998, and
the related consolidated statements of income, of cash flows, and of common
shareholders' equity for each of the three years in the period ended
December 31, 1999 included in this proxy statement/prospectus have

                                       78
<PAGE>
been so included in reliance on the report (which contains explanatory
paragraphs relating to a change in MPC's method of accounting for transactions
involving the sale of dark fiber and to the retroactive reclassification of
MPC's oil and natural gas operations and coal operations as discontinued
operations due to its committed plan to divest of such operations) of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
that firm as experts in auditing and accounting.

    The special purpose statement of selected assets to be sold of Qwest's
divested businesses as of June 30, 2000 and the related statements of revenues
and direct expenses for each of the three years in the period ended
December 31, 1999, incorporated in this proxy statement/prospectus by reference
to MPC's Form 8-K/A dated September 15, 2000 have been so incorporated in
reliance on the report of Arthur Andersen LLP, independent accountants, given on
the authority of that firm as experts in auditing and accounting.

    Representatives of PricewaterhouseCoopers LLP, principal accountants, are
expected to be present at the special meeting. The representatives of the
principal accountants will have the opportunity to make a statement regarding
the proposed restructuring if they desire to do so, and they are expected to be
available to respond to appropriate questions from the shareholders at the
special meeting.

                             SHAREHOLDER PROPOSALS

    Shareholder proposals intended to be included in the proxy statement and
form of proxy for the 2001 annual meeting of MPC shareholders should have been
received no later than November 26, 2000 by the Corporate Secretary at the
following address: The Montana Power Company, 40 E. Broadway Street, Butte,
Montana 59701. The proposal must also have met the other requirements of the
rules of the Securities and Exchange Commission relating to shareholder
proposals.

                                 OTHER MATTERS

    As of the date of this proxy statement/prospectus, the MPC Board does not
know of any matter that will be presented for consideration at the special
meeting other than as described in this proxy statement/prospectus.

                      WHERE YOU CAN FIND MORE INFORMATION

    Touch America Holdings filed a registration statement on Form S-4 on
[      ], 2001, to register with the Securities and Exchange Commission the
Touch America Holdings' common stock and preferred stock to be issued to MPC's
shareholders in the merger. This proxy statement/prospectus is a part of that
registration statement and constitutes a prospectus of Touch America Holdings in
addition to being a proxy statement/prospectus of MPC. As allowed by Securities
and Exchange Commission rules, this proxy statement/prospectus does not contain
all the information you can find in Touch America Holdings' registration
statement or the exhibits to the registration statement. MPC files annual,
quarterly and special reports, proxy statements and other information with the
Securities and Exchange Commission. You may read and copy any reports,
statements or other information that MPC files with the Securities and Exchange
Commission at the Securities and Exchange Commission's public reference rooms at
the following locations:

<TABLE>
<S>                            <C>                            <C>
    Public Reference Room        New York Regional Office        Chicago Regional Office
   450 Fifth Street, N.W.          7 World Trade Center              Citicorp Center
          Room 1024                     Suite 1300               500 West Madison Street
   Washington, D.C. 20549           New York, NY 10048                 Suite 1400
                                                                 Chicago, IL 60661-2511
</TABLE>

                                       79
<PAGE>
    Please call the Securities and Exchange Commission at 1-800-SEC-0330 for
further information on the public reference rooms. These Securities and Exchange
Commission filings are also available to the public from commercial document
retrieval services and at the Internet worldwide web site maintained by the
Securities and Exchange Commission at "http://www.sec.gov." Reports, proxy
statements and other information concerning MPC may also be inspected at the
offices of the New York Stock Exchange, which is located at 20 Broad Street, New
York, New York 10005.

    The Securities and Exchange Commission allows MPC and Touch America Holdings
to "incorporate by reference" information into this proxy statement/prospectus,
which means that the companies can disclose important information to you by
referring you to other documents filed separately with the Securities and
Exchange Commission. The information incorporated by reference is considered
part of this proxy statement/prospectus, except for any information superseded
by information contained directly in this proxy statement/prospectus or in later
filed documents incorporated by reference in this proxy statement/prospectus.

    This proxy statement/prospectus incorporates by reference the documents set
forth below that MPC has previously filed with the Securities and Exchange
Commission. These documents contain important business and financial information
about MPC and Touch America Holdings that is not included in or delivered with
this proxy statement/prospectus.

<TABLE>
<S>                                            <C>
MPC FILINGS (FILE NO. 1-4566)                  PERIOD

Annual Report on Form 10-K                     Year ended December 31, 1999

Quarterly Reports on Form 10-Q                 Quarters ended March 31, 2000, June 30, 2000
                                               and September 30, 2000

Current Reports on Form 8-K/8-K/A              Filed January 3, 2000, January 25, 2000,
                                               April 4, 2000, April 25, 2000, July 17,
                                               2000, July 25, 2000, September 11, 2000,
                                               September 15, 2000, September 20, 2000,
                                               September 27, 2000, October 6, 2000,
                                               October 25, 2000, November 15, 2000 and
                                               January [  ], 2001

Proxy Statement                                Filed March 21, 2000
</TABLE>

    This proxy statement/prospectus also incorporates by reference all
additional documents that may be filed by MPC with the Securities and Exchange
Commission under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act between
the date of this proxy statement/prospectus and the date of MPC special meeting,
as applicable. These include periodic reports, such as Annual Reports on
Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, as
well as proxy statements.

    MPC has supplied all information contained or incorporated by reference in
this proxy statement/ prospectus relating to MPC and Touch America Holdings.

    If you are an MPC shareholder, we may have sent you some of the documents
incorporated by reference, but you can also obtain any of them through MPC, the
Securities and Exchange Commission or the Securities and Exchange Commission's
Internet web site as described above. Documents incorporated by reference are
available from MPC without charge, excluding all exhibits, except that if MPC
has specifically incorporated by reference an exhibit in this proxy
statement/prospectus, the exhibit will also be provided without charge. You may
obtain documents incorporated by reference in

                                       80
<PAGE>
this proxy statement/prospectus by requesting them in writing or by telephone
from the MPC at the following addresses:

    The Montana Power Company
    c/o Corporate Investor Communication, Inc.
    111 Commerce Road
    Cerlstadt, NJ 07072

    INDIVIDUAL SHAREHOLDERS SHOULD CALL:
    1-800-793-1283

    BANKS AND BROKERS SHOULD CALL:
    (201) 896-2633

    If you would like to request documents, please do so by [         ], 2001 in
order to receive them before your special meeting.

    You should rely only on the information contained or incorporated by
reference in this proxy statement/prospectus. We have not authorized anyone to
provide you with information that is different from what is contained in this
proxy statement/prospectus. Therefore, if anyone does give you information of
this sort, you should not rely on it. If you are in a jurisdiction where offers
to exchange or sell, or solicitations of offers to exchange or purchase, the
securities offered by this document or the solicitation of proxies is unlawful,
or if you are a person to whom it is unlawful to direct these types of
activities, then the offer presented in this document does not extend to you.
This proxy statement/ prospectus is dated [      ], 2001. You should not assume
that the information contained in this proxy statement/prospectus is accurate as
of any date other than that date. Neither the mailing of this proxy
statement/prospectus to MPC's shareholders nor the issuance of Touch America
Holdings' common stock or preferred stock in the merger creates any implication
to the contrary.

                                       81
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS

THE MONTANA POWER COMPANY

CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
Report of Independent Accountants...........................     F-2
Recent Developments.........................................     F-3
Consolidated Financial Statements:
  Consolidated Statements of Income for the Years Ended
    December 31, 1999, 1998 and 1997........................     F-8
  Consolidated Balance Sheets as of December 31, 1999 and
    1998....................................................     F-9
  Consolidated Statements of Cash Flows for the Years Ended
    December 31, 1999, 1998,
    and 1997................................................    F-11
  Consolidated Statements of Common Shareholders' Equity for
    the Years Ended December 31, 1999, 1998, and 1997.......    F-12
  Notes to Consolidated Financial Statements................    F-13
Schedule II--Valuation and Qualifying Accounts and
  Reserves..................................................    F-50
Schedule III--Computation of Ratio of Earnings to Fixed
  Charges--Unaudited........................................    F-51
Schedule IV--Financial Data--Unaudited......................    F-52

Financial statement schedules not included herein have been omitted
  because they are inapplicable or the required information is shown
  in the Consolidated Financial Statements or in the Notes to the
  Consolidated Financial Statements.
</TABLE>

                                      F-1
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Shareholders of The Montana Power Company:

    In our opinion, the consolidated financial statements listed in the
accompanying index present fairly, in all material respects, the financial
position of The Montana Power Company and its subsidiaries at December 31, 1999
and 1998, and the results of their operations and their cash flows for each of
the three years in the period ended December 31, 1999, in conformity with
accounting principles generally accepted in the United States of America. In
addition, in our opinion, the financial statement schedule listed in the
accompanying index presents fairly, in all material respects, the information
set forth therein when read in conjunction with the related consolidated
financial statements. These financial statements and financial statement
schedule are the responsibility of the Company's management; our responsibility
is to express an opinion on these financial statements and financial statement
schedule based on our audits. We conducted our audits of these statements in
accordance with auditing standards generally accepted in the United States of
America, which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for the opinion expressed above.

    As more fully discussed in Note 1 to the Consolidated Financial Statements,
as of July 1, 1999, the Company changed its method of accounting for
transactions involving the sale of dark fiber.

    February 10, 2000, except in Note 3 for the final paragraph under
the"Telecommunications" section entitled"Investments and Acquisitions," as to
which the date is March 13, 2000, and for Note 14, as to which the date is
December 15, 2000

    As more fully described in Note 14, the Company, as of September 1, 2000,
committed itself to a plan of action to divest and sell its oil and gas
operations and its coal operations. The accompanying consolidated statements of
income and of cash flows have been retroactively reclassified to present the oil
and gas operations and coal operations as discontinued operations for each of
the three years in the period ended December 31, 1999.

    /s/PricewaterhouseCoopers LLP

    Portland, Oregon

                                      F-2
<PAGE>
                           THE MONTANA POWER COMPANY

                     1999 CONSOLIDATED FINANCIAL STATEMENTS

RECENT DEVELOPMENTS

    We have reclassified the historical financial information presented in our
1999 Annual Report on Form 10-K to reflect discontinued operations accounting
treatment for oil and natural gas operations and coal operations. As discussed
in more detail in Note 14, "Subsequent Events," we entered into a definitive
agreement to sell our oil and natural gas operations in late August 2000 and a
definitive agreement to sell our coal operations in mid-September 2000. Both
agreements were subject to customary closing conditions. The sale of our oil and
natural gas operations closed on October 31, 2000. We expect the sale of our
coal operations to close at approximately the end of the first quarter 2001. We
applied discontinued operations accounting treatment to both of these operations
effective September 1, 2000 and, as a result, we are reporting our income
statements and cash-flow statements for all periods presented to show financial
results and cash flows on a continuing/discontinued basis.

SALE OF REMAINING ENERGY BUSINESSES

    THE MONTANA POWER LLC

    On September 29, 2000, we, together with our affiliate, Touch America
Holdings, Inc., a Delaware corporation, entered into a Unit Purchase Agreement
with NorthWestern Corporation, a Delaware corporation (NorthWestern), pursuant
to which NorthWestern agreed, as discussed below, to purchase our affiliate, The
Montana Power LLC, a Montana limited liability company. The Montana Power LLC
will hold--among other assets, liabilities, and commitments--our electric and
natural gas utility businesses, including Colstrip Unit 4. The consideration
pursuant to the agreement is $1,090,000,000, comprised of cash of $602,000,000
and NorthWestern's assumption of $488,000,000 of our debt.

    Prior to closing the transaction, we will restructure our organization so
that The Montana Power Company will be merged into The Montana Power LLC.
NorthWestern will then acquire all of the outstanding membership interests in
Montana Power LLC from Touch America Holdings, Inc.

    The transaction is targeted to close at approximately the end of the second
quarter 2001. The closing is subject to the approval of our shareholders,
regulatory approvals from the PSC and FERC, and other customary conditions,
including any necessary antitrust determinations. Accordingly, we can provide no
assurance that the transaction will close or, if it does, that the terms and
conditions will not change.

    CONTINENTAL ENERGY SERVICES, INC.

    On September 19, 2000, Entech entered into a Stock Purchase Agreement with
BBI Power Corporation, a Delaware corporation (BBI Power), pursuant to which BBI
Power agreed to purchase the stock of Continental Energy Services, Inc., our
remaining independent power business. The purchase price is $84,500,000, subject
to certain adjustments. We expect the transaction to close in January 2001,
subject to customary closing and other conditions. However, we can provide no
assurance that the transaction will close or, if it does, that the terms and
conditions will not change.

    CONTINUING OPERATIONS

    Because our proposed restructuring and sale of all of the outstanding
membership interests in The Montana Power LLC are subject to shareholder
approval, we have not yet applied discontinued operations accounting to our
utility operations. In addition, because Colstrip Unit 4, which is included in
the sale of the utility operations, has historically been reported as part of
the independent power group segment with Continental Energy Services, Inc., that
entire independent power group segment

                                      F-3
<PAGE>
                           THE MONTANA POWER COMPANY

               1999 CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

will not be afforded discontinued operations accounting treatment until we
receive the shareholder approval required for our restructuring and the sale of
our remaining utility businesses. Consequently, we have reported the results of
operations for the utility and the independent power group under continuing
operations.

REGULATORY MATTERS

    As discussed in Note 4, "Deregulation and Regulatory Matters," the electric
and natural gas utility businesses in Montana are transitioning to a competitive
market in which commodity energy products and related services are sold directly
to wholesale and retail customers. In implementing our comprehensive transition
plan, we initiated litigation in Montana District Court in Butte to address our
ability to use tracking mechanisms to ensure fair and accurate recovery of
above-market QF costs and certain other transition costs. We also sought court
clarification on whether the Electric Act authorized a rate moratorium or a rate
cap during the transition period that ends July 1, 2002.

    The district court issued an order in May 2000. The court ruled that the PSC
must allow us to incorporate tracking mechanisms in our transition plan
proposal. The court also ruled that the Electric Act authorized a rate cap. The
PSC appealed the court's decision regarding tracking mechanisms to the Montana
Supreme Court. We did not appeal the decision regarding the rate moratorium. The
parties completed briefing of the tracking-mechanisms issue in October 2000 and
are awaiting a decision from the Montana Supreme Court, which has requested
amicus briefs and will schedule oral argument.

    After the district court case, we updated our Tier II filing to reflect the
closing of the sale of our electric generating assets. The PSC has suspended the
procedural schedule and, therefore, we do not expect an order from the PSC until
the fourth quarter 2001.

ELECTRIC/FERC

    Through a stranded-costs filing with FERC in April 2000, we are seeking
recovery of approximately $23,800,000 in transition costs associated with
serving two rural electric cooperatives. We do not expect a FERC decision on
this filing, which corresponds with our transition-costs recovery proceedings
with the PSC in Montana, until 2001.

ELECTRIC AND NATURAL GAS/PSC

    On August 11, 2000, we filed a combined rate case with the PSC, seeking
increased electric and natural gas rates. We requested increased annual electric
transmission and distribution revenues of approximately $38,500,000, with a
proposed interim annual increase of approximately $24,900,000. We also requested
increased annual natural gas revenues of approximately $12,000,000 with a
proposed interim annual increase of approximately $6,000,000. The PSC granted us
an electric and natural gas interim rate increase of approximately $19,800,000
that became effective November 29, 2000. We expect a final order in May 2001.

    On August 25, 2000, we filed a request for increased electric rates to
recover approximately $9,200,000 of higher power-supply costs relating to
certain QF costs on an interim basis, pending final determination of QF
transition costs. In a work session with the PSC on October 25, 2000, the PSC
denied our request. We have clarified and asked our request and ask the PSC to
reconsider its decision.

                                      F-4
<PAGE>
                           THE MONTANA POWER COMPANY

               1999 CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

LONG-TERM POWER SUPPLY AGREEMENTS

    In accordance with Statement of Financial Accounting Standards No. 5,
"Accounting for Contingencies," we recorded a $10,000,000 provision in the third
quarter 2000 for future pretax losses relating to existing long-term power
supply agreements. An ongoing power supply agreement with one industrial
customer exposes us to most of the expected loss. That agreement obligates us to
deliver to that customer one half of its electric energy at a fixed price and
the remainder at an index-based price with a cap.

    Since the sale of our electric generating assets, we have been supplying our
customers with electric energy purchased through an index-based contract. The
volume of electric energy that we are committed to purchase under this
index-based contract exceeds our customers' usage estimates.

    In June 1998, we entered into a derivative financial transaction, called a
"swap", with the industrial customer so that the customer could effectively
purchase all of its electricity from us at a fixed rate. At the same time, we
entered into a separate fixed-price purchase and related index-based sale of
equivalent volumes with other counterparties to hedge that swap and eliminate
our exposure to fluctuating market prices. Both the purchase and sale agreements
with the other counterparties remain effective through May 2001. During the
third quarter of this year, however, our industrial customer increased its
electric energy consumption, and wholesale electric prices increased
substantially. The combination of these two events rendered the swap and related
physical offset less effective.

    Specifically, the average monthly purchases of electric energy by the
industrial customer increased more than 30 percent during the third quarter 2000
compared to the second quarter 2000. Average monthly wholesale electric prices
in the Pacific Northwest, based on the Mid-Columbia price index, more than
doubled during the third quarter 2000 compared to the second quarter 2000.
Because of these two events, the expenses of supplying our customers with
electric energy during the third quarter 2000 exceeded the associated revenues
earned from these customers and the swap and physical offset by approximately
$8,500,000.

    Usage estimates provided by these customers and wholesale electric prices
calculated from forward price projections and broker quotes indicate that the
costs of supplying electric energy to these customers are expected to continue
to result in losses, until the expected closing of the sale of our utility
businesses to NorthWestern by the end of the first quarter 2001. On October 30,
2000, therefore, we entered into a five-month agreement with a counterparty to
swap the market-index price at which we purchase electricity for those customers
with the fixed price at which we sell it to them. As long as these customers do
not materially change their estimated electric usage, this swap will allow us to
fix the total cost of supplying their electric energy and thus mitigate the
possibility of incurring more loss than the $10,000,000 provision.

    We expect to continue to seek other opportunities to mitigate the commodity
price risk associated with our power supply agreements.

ACQUISITION OF PROPERTIES FROM QWEST

    On June 30, 2000, in accordance with a previously executed stock purchase
agreement, we acquired from Qwest Communications International Inc. (Qwest)
wholesale, private-line, long-distance, and other telecommunications services in
US WEST's fourteen-state region associated with Qwest's interLATA businesses for
approximately $206,000,000, subject to certain adjustments. We estimate that
Touch America's related capital expenditures, mainly to install optronics on new
routes, will be an additional $70,000,000. The fourteen-state region covers
approximately 250,000 customer accounts for

                                      F-5
<PAGE>
                           THE MONTANA POWER COMPANY

               1999 CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

voice, data, and video services. Touch America also acquired a fiber-optic
network of 1,800 route miles and associated optronics and switches that will
connect to Touch America's existing fiber-optic network. As a result of the
acquisition, Touch America retained 173 of Qwest's former sales and
sales-support personnel in the fourteen-state region.

    We accounted for the acquisition using the purchase method of accounting. As
a result, we have allocated our cost of the acquisition to the assets acquired
and liabilities assumed based on our estimates of their fair values as of the
June 30, 2000 acquisition date. Accordingly, we recorded approximately
$60,000,000 of property and equipment and approximately $146,000,000 of
intangible assets related to this acquisition. We are amortizing the acquired
property and equipment and intangible assets over their estimated useful lives
on the straight-line basis in accordance with our stated policies. An
independent third party is presently appraising the value of the properties
acquired. When this appraisal is complete, which is expected to occur in the
first quarter 2001, we will adjust our allocation of the purchase price among
the various balance sheet classifications, if necessary.

    The accounts of the Qwest acquisition have been included in our consolidated
accounts since June 30, 2000. The following table presents the summarized
consolidated results of operations for the year ended December 31, 1999 on an
unaudited, pro forma basis as though the acquisition had occurred as of
January 1, 1999:

<TABLE>
<CAPTION>
                                                              (THOUSANDS OF DOLLARS)
                                                              ----------------------
<S>                                                           <C>
Revenues....................................................        $1,103,281
Income from Continuing Operations...........................           129,231
Net Income Available for Common.............................           177,466
Earnings per share:
  Basic.....................................................        $     1.62
  Diluted...................................................        $     1.61
</TABLE>

LONG-TERM DEBT

    We retired at maturity $10,000,000 of 8.80 percent Series A Unsecured MTNs
on February 22, 2000.

    On April 13, 2000, we retired prior to maturity $25,000,000 of our
7.5 percent First Mortgage Bonds (Bonds) due April 1, 2001.

    On April 25, 2000, we offered to purchase any or all of the following series
of our outstanding debt: 8.95 percent Bonds due February 1, 2022; 7.33 percent
Secured MTNs due April 15, 2025; 8.11 percent Secured MTNs due January 25, 2023;
7.00 percent Bonds due March 1, 2005; and 8.25 percent Bonds due February 1,
2007. The total amount outstanding for these issues was $190,000,000 as of
April 25, 2000. On May 24, 2000, we retired $182,700,000 of this amount, as
follows:

    - $48,500,000 of 8.95 percent Bonds due February 1, 2022;

    - $20,000,000 of 7.33 percent Secured Series A MTNs due April 15, 2025;

    - $15,000,000 of 8.11 percent Secured Series A MTNs due January 25, 2023;

    - $44,600,000 of 7.00 percent Bonds due March 1, 2005; and

    - $54,600,000 of 8.25 percent Bonds due February 1, 2007.

                                      F-6
<PAGE>
                           THE MONTANA POWER COMPANY

               1999 CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

    In addition, we retired at maturity $20,000,000 of 7.20 percent Series A
Secured MTNs on June 1, 2000.

    These debt retirements were made from the proceeds received from the sale of
the electric generating assets.

    As part of the Tier II rate filing discussed in Note 4, "Deregulation and
Regulatory Matters," we indicated our intention to retire approximately
$266,000,000 of debt. With all retirements of MTNs and Bonds discussed above,
the actual amount of debt retired (including the retirement in 1999 of
$15,000,000 of 7.875 percent Series B Unsecured MTNs due December 23, 2026) was
slightly less than $265,000,000 and the associated expenses, which are expected
to be recovered through the Tier II filing, were approximately $9,300,000.

    On April 4, 2000, a $100,000,000 Revolving Credit Agreement associated with
some of our nonutility operations terminated, with no amount outstanding.

    At September 30, 2000, we had notes payable to banks for $80,000,000 at an
average annual interest rate of approximately 7.46 percent. On November 8, 2000,
we converted these notes, along with an additional $20,000,000 borrowed after
the end of the third quarter, to borrowings under the term loan provisions of
our Senior Secured Credit Facility discussed below.

    CREDIT FACILITIES

    On June 29, 2000, we entered into a $30,000,000 Revolving Credit Agreement
for use in our nonutility operations that expires on June 28, 2001 and a
$200,000,000 90-Day Credit Agreement for use in our telecommunications
operations. On November 7, 2000, we replaced the $200,000,000 90-Day Credit
Agreement with a $400,000,000 5-year Senior Secured Credit Facility. The loan
facility consists of a $200,000,000 term loan and $200,000,000 revolver, either
of which we may be used for short- or long-term borrowing. Under this facility,
interest is assessed against outstanding balances at a variable rate based on
Touch America's credit rating and LIBOR, and annual commitment fees are based on
the amount of loans outstanding.

FINANCIAL STATEMENTS AND EXHIBITS

    For income statement purposes, we have separately reported net income after
income taxes from oil and natural gas operations and coal operations in "income
from discontinued operations" for all periods presented. For balance sheet
purposes, we have not made any reclassifications to reflect discontinued
operations for any periods presented. For cash flow statement purposes, we have
reported cash flows from oil and natural gas operations and coal operations as
"net cash provided by discontinued operations," "net cash used for discontinued
investing activities," and "net cash provided by (used for) discontinued
financing activities" for all periods presented.

                                      F-7
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES

                        CONSOLIDATED STATEMENT OF INCOME

                          (RECLASSIFIED--SEE NOTE 14)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31
                                                              ------------------------------
                                                                1999       1998       1997
                                                              --------   --------   --------
                                                                  (THOUSANDS OF DOLLARS)
                                                                (EXCEPT PER-SHARE AMOUNTS)
<S>                                                           <C>        <C>        <C>
Revenues....................................................  $812,028   $876,596   $696,028
Expenses:
  Operations and maintenance................................   376,575    371,649    306,377
  Selling, general, and administrative......................   115,134     98,239     92,126
  Taxes other than income taxes.............................    71,933     67,088     64,957
  Depreciation, depletion, and amortization.................    79,576     85,245     69,375
                                                              --------   --------   --------
                                                               643,218    622,221    532,835
                                                              --------   --------   --------
  Income from continuing operations.........................   168,810    254,375    163,193
Interest expense and other income:
  Interest..................................................    41,593     59,373     54,133
  Distributions on company obligated mandatorily redeemable
    preferred securities of subsidiary trust................     5,492      5,492      5,492
  Other income--net.........................................    (7,526)    (3,029)   (22,593)
                                                                39,559     61,836     37,032
                                                              --------   --------   --------
Income taxes................................................    30,830     66,843     48,585
                                                              --------   --------   --------
Net income from continuing operations.......................    98,421    125,696     77,576
Discontinued operations:
  Income from discontinued oil and natural gas operations,
    net of income taxes.....................................    14,525      9,743     32,095
  Income from discontinued coal operations, net of income
    taxes...................................................    37,400     30,181     18,961
                                                              --------   --------   --------
Net income..................................................   150,346    165,620    128,632
Dividends on preferred stock................................     3,690      3,690      3,690
                                                              --------   --------   --------
Net income available for common stock.......................  $146,656   $161,930   $124,942
                                                              ========   ========   ========
Average number of common shares outstanding--basic (000)....   109,795    109,962    109,298
Basic earnings per share of common stock....................  $   1.34   $   1.47   $   1.14
                                                              ========   ========   ========
Average number of common shares outstanding--diluted (000)     110,553    110,156    109,400
Diluted earnings per share of common stock..................  $   1.33   $   1.47   $   1.14
                                                              ========   ========   ========
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-8
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEET

<TABLE>
<CAPTION>
                                                                    DECEMBER 31
                                                              -----------------------
                                                                 1999         1998
                                                              ----------   ----------
                                                              (THOUSANDS OF DOLLARS)
<S>                                                           <C>          <C>
                                       ASSETS
Plant and property in service:
  Utility plant.............................................  $1,466,727   $2,246,847
  Less -- accumulated depreciation and depletion............     464,653      732,385
                                                              ----------   ----------
                                                               1,002,074    1,514,462
Nonutility property.........................................   1,051,997      864,981
Less -- accumulated depreciation and depletion..............     349,045      297,933
                                                              ----------   ----------
                                                                 702,952      567,048
                                                              ----------   ----------
                                                               1,705,026    2,081,510
Miscellaneous investments:
  Independent power investments.............................      23,460       24,268
  Reclamation fund..........................................      43,460       41,542
  Other.....................................................      93,231       84,256
                                                              ----------   ----------
                                                                 160,151      150,066
Current assets:
  Cash and cash equivalents.................................     554,407       10,116
  Temporary investments.....................................      40,417           --
  Accounts receivable, net of allowance for doubtful
    accounts................................................     182,248      170,652
  Notes receivable..........................................          --       29,089
  Materials and supplies (principally at average cost)......      37,928       42,292
  Prepayments and other assets..............................      53,733       57,331
  Deferred income taxes.....................................      18,303       18,755
                                                              ----------   ----------
                                                                 887,036      328,235
Deferred charges:
  Advanced coal royalties...................................      12,506       14,312
  Regulatory assets related to income taxes.................      60,538      121,735
  Regulatory assets -- other................................     150,486      154,193
  Other deferred charges....................................      73,000       78,044
                                                              ----------   ----------
                                                                 296,530      368,284
                                                              ----------   ----------
                                                              $3,048,743   $2,928,095
                                                              ==========   ==========
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-9
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEET

<TABLE>
<CAPTION>
                                                                    DECEMBER 31
                                                              -----------------------
                                                                 1999         1998
                                                              ----------   ----------
                                                              (THOUSANDS OF DOLLARS)
<S>                                                           <C>          <C>
                        LIABILITIES AND SHAREHOLDERS' EQUITY
Capitalization:
  Common shareholders' equity:
    Common stock (240,000,000 shares without par value
      authorized; 110,218,973 and 110,121,040 shares
      issued)...............................................  $  702,773   $  702,511
    Treasury stock (4,682,100 shares authorized, issued, and
      repurchased by the Company)...........................    (144,872)          --
    Unallocated stock held by trustee for Retirement Savings
      Plan..................................................     (20,401)     (23,298)
    Retained earnings and other shareholders' equity........     488,975      430,309
    Accumulated other comprehensive loss....................     (17,659)     (20,717)
                                                              ----------   ----------
                                                               1,008,816    1,088,805
  Preferred stock...........................................      57,654       57,654
  Company obligated mandatorily redeemable preferred
    securities of subsidiary trust, which holds solely
    Company junior subordinated debentures..................      65,000       65,000
  Long-term debt............................................     618,512      698,329
                                                              ----------   ----------
                                                               1,749,982    1,909,788
Current Liabilities:
  Short-term borrowings.....................................          --       69,820
  Long-term debt--portion due within one year...............      58,955       96,292
  Dividends payable.........................................      22,746       22,765
  Income taxes..............................................     152,739       24,857
  Other taxes...............................................      54,630       51,777
  Accounts payable..........................................     115,654       97,197
  Interest accrued..........................................      11,597       13,156
  Other current liabilities.................................      92,277       40,087
                                                              ----------   ----------
                                                                 508,598      415,951
Deferred Credits:
  Deferred income taxes.....................................       8,847      323,906
  Investment tax credits....................................      13,330       33,819
  Accrued mining reclamation costs..........................     135,075      129,558
  Deferred revenue..........................................     311,751       19,950
  Net proceeds from the generation sale.....................     219,726           --
  Other deferred credits....................................     101,434       95,123
                                                              ----------   ----------
                                                                 790,163      602,356
                                                              ----------   ----------
Contingencies and Commitments (Notes 2 and 3)
                                                              $3,048,743   $2,928,095
                                                              ==========   ==========
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-10
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES

                      CONSOLIDATED STATEMENT OF CASH FLOWS

                          (RECLASSIFIED--SEE NOTE 14)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED DECEMBER 31
                                                              ---------------------------------
                                                                1999        1998        1997
                                                              ---------   ---------   ---------
                                                                   (THOUSANDS OF DOLLARS)
<S>                                                           <C>         <C>         <C>
NET CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income from continuing operations.....................  $  98,421   $ 125,696   $  77,576
  Adjustments to reconcile net income to net cash provided
    by operating activities:
      Depreciation, depletion, and amortization.............     79,576      85,245      69,375
      Deferred income taxes.................................   (315,588)    (42,258)      3,692
      Noncash earnings from unconsolidated investments......    (20,608)    (10,871)    (14,015)
      (Gains) losses on sales of property and investments...         67       5,651     (24,438)
      Other noncash charges to net income--net..............     25,154      32,131      33,113
      Changes in assets and liabilities:
        Accounts and notes receivable.......................     12,333     (30,393)     21,344
        Deferred income taxes...............................      3,379      (4,745)        319
        Income taxes payable................................    129,228      21,582      (1,494)
        Accounts payable....................................     26,244      (8,031)      8,875
        Deferred revenue and other..........................    291,790      11,800       6,097
        Generation asset sale--net proceeds.................    219,726          --          --
        Other assets and liabilities--net...................     71,080      34,678     (25,713)
                                                              ---------   ---------   ---------
    Net cash provided by continuing operations..............    620,802     220,485     154,731
    Net cash provided by discontinued operations............     39,381      35,192      46,360
                                                              ---------   ---------   ---------
    Net cash provided by operating activities...............    660,183     255,677     201,091
                                                              ---------   ---------   ---------
NET CASH FLOWS FROM INVESTING ACTIVITIES:
  Capital expenditures......................................   (233,192)   (151,044)   (166,063)
  Proceeds from sales of property and investments...........    586,150      38,063      46,696
  Additional investments....................................     (1,272)     (7,732)    (13,121)
                                                              ---------   ---------   ---------
    Net cash provided by (used for) continuing investing
      activities............................................    351,686    (120,713)   (132,488)
    Net cash used for discontinued investing activities.....    (45,182)    (38,839)    (66,880)
                                                              ---------   ---------   ---------
    Net cash provided by (used for) investing activities....    306,504    (159,552)   (199,368)
                                                              ---------   ---------   ---------
NET CASH FLOWS FROM FINANCING ACTIVITIES:
  Dividends paid............................................    (90,902)    (91,598)    (91,112)
  Sales of common stock.....................................        751       7,421       2,201
  Purchase of treasury stock................................   (144,872)         --          --
  Issuance of long-term debt................................     23,397     139,947      86,676
  Retirement of long-term debt..............................   (147,544)    (77,873)    (71,634)
  Net change in short-term borrowing........................    (69,820)    (64,138)     29,256
  Issuance of mandatorily redeemable preferred securities...         --          --         (67)
                                                              ---------   ---------   ---------
    Net cash used for continuing financing activities.......   (428,990)    (86,241)    (44,680)
    Net cash provided by (used for) discontinued financing
      activities............................................      6,594      (2,538)     16,699
                                                              ---------   ---------   ---------
    Net cash used for financing activities..................   (422,396)    (88,779)    (27,981)
                                                              ---------   ---------   ---------
CHANGE IN CASH FLOWS........................................    544,291       7,346     (26,258)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR................     10,116       2,770      29,028
                                                              ---------   ---------   ---------
CASH AND CASH EQUIVALENTS, END OF YEAR......................  $ 554,407   $  10,116   $   2,770
                                                              =========   =========   =========
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
  Cash paid during the year for:
    Income taxes, net of refunds............................  $ 213,362   $  90,663   $  50,797
    Interest................................................     53,273      67,777      59,681
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-11
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES

             CONSOLIDATED STATEMENT OF COMMON SHAREHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31
                                                           ------------------------------------
                                                              1999         1998         1997
                                                           ----------   ----------   ----------
<S>                                                        <C>          <C>          <C>
COMMON STOCK:
  Balance at beginning of year...........................  $  702,511   $  694,561   $  691,853
  Issuances (100,857; 663,622; and 195,430 shares).......         357        7,950        2,708
  Reacquired capital stock (4,682,100 shares)............    (144,872)          --           --
  Premium on capital stock...............................         (95)          --           --
                                                           ----------   ----------   ----------
  Balance at end of year.................................     557,901      702,511      694,561
                                                           ----------   ----------   ----------
RETAINED EARNINGS AND OTHER SHAREHOLDERS' EQUITY:
  Balance at beginning of year...........................     430,309      356,327      318,977
  Net income.............................................     150,346      165,620      128,632
  Dividends on common stock (80 cents per share each
    year)................................................     (88,155)     (88,008)     (87,494)
  Dividends on preferred stock...........................      (3,690)      (3,690)      (3,690)
  Other..................................................         165           60          (98)
                                                           ----------   ----------   ----------
  Balance at end of year.................................     488,975      430,309      356,327
                                                           ----------   ----------   ----------
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):
  Balance at beginning of year...........................     (20,717)     (13,354)     (11,173)
                                                           ----------   ----------   ----------
  Net income.............................................     150,346      165,620      128,632
  Foreign currency translation adjustments...............       3,058       (7,363)      (2,181)
                                                           ----------   ----------   ----------
  Total comprehensive income.............................     153,404      158,257      126,451
  Deduct net income included in comprehensive income.....    (150,346)    (165,620)    (128,632)
                                                           ----------   ----------   ----------
  Other comprehensive income (loss)......................       3,058       (7,363)      (2,181)
                                                           ----------   ----------   ----------
  Balance at end of year.................................     (17,659)     (20,717)     (13,354)
                                                           ----------   ----------   ----------
UNALLOCATED STOCK HELD BY TRUSTEE FOR RETIREMENT SAVINGS:
  Balance at beginning of year...........................     (23,298)     (25,945)     (28,360)
  Distributions..........................................       2,897        2,647        2,415
                                                           ----------   ----------   ----------
  Balance at end of year.................................     (20,401)     (23,298)     (25,945)
                                                           ----------   ----------   ----------
    TOTAL COMMON SHAREHOLDERS' EQUITY AT END OF YEAR.....  $1,008,816   $1,088,805   $1,011,589
                                                           ==========   ==========   ==========
</TABLE>

        The accompanying notes are an integral part of these statements.

                                      F-12
<PAGE>
                       NOTES TO THE FINANCIAL STATEMENTS

NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF ACCOUNTING

    Our accounting policies conform with generally accepted accounting
principles. With respect to our utility operations, these policies are in
accordance with the accounting requirements and ratemaking practices of
applicable regulatory authorities.

USE OF ESTIMATES

    Preparing financial statements requires the use of estimates based on
information available. Actual results may differ from our accounting estimates
as new events occur or we obtain additional information.

RECLASSIFICATIONS

    We have made reclassifications to certain prior-year amounts to make them
comparable to the 1999 presentation. These changes had no effect on previously
reported results of operations or shareholders' equity.

CONSOLIDATION PRINCIPLES

    The consolidated financial statements include accounts and results of our
wholly owned subsidiaries. We have eliminated significant intercompany balances
and transactions. We account for our significant telecommunications and
independent power investments using the equity method, because we exercise
significant influence over those operations. To facilitate the timely
preparation of the consolidated financial statements, the accounts of certain
operations have been consolidated for fiscal years ending in November. The
consolidated financial statements in fiscal year 2000 will eliminate the
one-month lag in reporting for these operations. The results of operations of
December 1999 for these entities, which would have previously been reported in
results of fiscal year 2000, will be recorded as an adjustment to beginning
retained earnings for fiscal year 2000.

PROPERTY AND PLANT

    The following table provides year-end balances of the major classifications
of property and plant:

<TABLE>
<CAPTION>
                                                                  DECEMBER 31
                                                            -----------------------
                                                               1999         1998
                                                            ----------   ----------
                                                            (THOUSANDS OF DOLLARS)
<S>                                                         <C>          <C>
UTILITY PLANT:
  Electric:
    Generation (including jointly owned)..................  $   11,954   $  724,483
    Transmission..........................................     372,174      373,630
    Distribution..........................................     573,531      550,844
    Other.................................................      92,684      192,899
  Natural Gas:
    Production and storage................................      73,959       75,658
    Transmission..........................................     163,968      152,804
    Distribution..........................................     147,764      146,896
    Other.................................................      30,693       29,633
                                                            ----------   ----------
      Total Utility.......................................   1,466,727    2,246,847
NONUTILITY PLANT:
    Coal..................................................     240,228      237,913
    Oil and natural gas...................................     432,763      388,153
    Technology............................................     238,147      113,474
    Electric generation...................................      76,536       76,189
    Other.................................................      64,323       49,252
                                                            ----------   ----------
      Total Nonutility....................................   1,051,997      864,981
                                                            ----------   ----------
      Total Plant.........................................  $2,518,724   $3,111,828
                                                            ==========   ==========
</TABLE>

                                      F-13
<PAGE>
NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    We capitalize the cost of plant additions and replacements, including an
allowance for funds used during construction (AFUDC), of utility plant. We
determine the rate used to compute AFUDC in accordance with a formula
established by the Federal Energy Regulatory Commission (FERC). This rate
averaged 7.1 percent for 1999, 8.3 percent for 1998, and 8.0 percent for 1997.
We charge costs of utility depreciable units of property retired, plus costs of
removal less salvage, to accumulated depreciation and recognize no gain or loss.
We recognize gain or loss upon the sale or other disposition of nonutility
property. We charge maintenance and repairs of plant and property, as well as
replacements and renewals of items determined to be less than established units
of plant, to operating expenses.

    For information on the sale of our electric generating assets, see Note 5,
"Sale of Electric Generating Assets."

    Included in the plant classifications are utility plant under construction
in the amounts of $3,782,000 and $37,966,000 for 1999 and 1998, respectively,
and nonutility plant under construction in the amounts $134,817,000 and
$10,990,000 for 1999 and 1998, respectively.

    We record provisions for depreciation and depletion at amounts substantially
equivalent to calculations made on straight-line and unit-of-production methods
by applying various rates based on useful lives of properties determined from
engineering studies. As a percentage of the depreciable and depletable utility
plant at the beginning of the year, our provisions for depreciation and
depletion of utility plant were approximately 3 percent for 1999, 1998, and
1997. Our nonutility oil and natural gas operations use the successful-efforts
method of accounting for exploration and development costs.

JOINTLY OWNED ELECTRIC PLANT

    Prior to the sale of the utility generating assets discussed in Note 5,
"Sale of Electric Generating Assets," we were a joint-owner of Colstrip Units 1,
2, and 3. We owned 50 percent of Units 1 and 2 and 30 percent of Unit 3. We also
owned an approximate 30 percent interest in the transmission facilities serving
these units. After the asset sale, we still own the transmission assets and
associated microwave equipment which remain in property, plant, and equipment
and, at December 31, 1999, our investment in these facilities was $43,380,000
and the related accumulated depreciation was $15,452,000.

    We also own $43,084,000 and $33,370,000 of the nonutility Colstrip Unit 4
share of common production plant and transmission plant, which is included in
nonutility plant "Electric generation" in the property, plant, and equipment
table above. The accumulated depreciation related to Unit 4 production and
transmission plant was $20,327,000 and $9,255,000, respectively.

    Each joint-owner provides its own financing. Our share of direct expenses
associated with the operation and maintenance of these joint facilities,
including Colstrip Units 1, 2, and 3 through December 17, 1999, is included in
the corresponding operating expenses in the Consolidated Statement of Income.

RECLAMATION FUND

    Under the current Colstrip Units 3 and 4 coal supply agreement, we maintain
a reclamation fund representing restricted cash necessary to meet our estimated
reclamation obligation at Western Energy for Units 3 and 4. We invest the funds
required for these reclamation obligations until we need them to perform
reclamation. At December 31, 1999, we had the funds invested entirely in a money
market account. We regularly accrue an expense and an offsetting liability
associated with our reclamation obligation. The reclamation fund is not offset
against our accumulated liability.

                                      F-14
<PAGE>
NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
REVENUE AND EXPENSE RECOGNITION

    We record operating revenues on the basis of consumption of service
rendered. To match revenues with associated expenses, we accrued unbilled
revenues for electric, natural gas and telecommunication services delivered to
customers but not yet billed at month-end.

    The Emerging Issues Task Force (EITF) Issue No. 98-10 requires that energy
contracts entered into under "trading activities" be marked to market with the
gains or losses shown net in the income statement. EITF 98-10 is effective for
fiscal years beginning after December 15, 1998. We adopted EITF 98-10 as of
January 1, 1999, and accordingly mark to market energy contracts that qualify as
"trading activities." The cumulative effect of adopting EITF 98-10 was not
significant.

    On July 8, 1999, the FASB issued Interpretation No. 43, "Real Estate Sales,"
which is an interpretation of SFAS No. 66, "Accounting for Sales of Real
Estate." This interpretation, which requires entities to recognize revenues from
dark-fiber sales over the period of the contract rather than at the time the
contract was entered into, if title to the rights of use does not transfer to
the lessee at the end of the contract, applies to transactions entered into
after June 30, 1999. As a result of FASB Interpretation No. 43, we changed, on a
prospective basis, how we account for transactions involving dark-fiber sales.
Rather than recognizing approximately $7,000,000 in revenues in the fourth
quarter from dark-fiber transactions pursuant to existing agreements entered
into after June 30, 1999, Touch America will recognize these earnings over the
applicable contract term. Net income for 1999 would have been approximately
$4,200,000 higher and both basic and diluted earnings per share would have been
$0.03 higher if we were not required to make this accounting change.

REGULATORY ASSETS AND LIABILITIES

    For our regulated operations, we follow SFAS No. 71, "Accounting for the
Effects of Certain Types of Regulation." Pursuant to this pronouncement, certain
expenses and credits, normally reflected in income as incurred, are recognized
when included in rates and recovered from or refunded to the customers.
Accordingly, we have recorded the following regulatory assets and liabilities
that will be recognized in expenses and revenues in future periods when the
matching revenues are collected.

    The following table provides year-end balances of the major classifications
of regulatory assets and liabilities:

<TABLE>
<CAPTION>
                                                         DECEMBER 31
                                       -----------------------------------------------
                                                1999                     1998
                                       ----------------------   ----------------------
                                        ASSETS    LIABILITIES    ASSETS    LIABILITIES
                                       --------   -----------   --------   -----------
                                                   (THOUSANDS OF DOLLARS)
<S>                                    <C>        <C>           <C>        <C>
Income Taxes.........................  $ 57,526                 $119,080
Colstrip Unit 3 carrying charge......    38,494                   40,325
Conservation programs................    28,378                   33,353
Competitive transition
Competitive transition charges
  (CTCs).............................    53,768                   56,059
Investment tax credits...............               $13,330                  $33,819
Other................................    44,646      12,178       43,308       9,474
                                       --------     -------     --------     -------
  Subtotal...........................   222,812      25,508      292,125      43,293
Less:
  Current portions...................    11,788       3,402       16,197       5,057
                                       --------     -------     --------     -------
  Total..............................  $211,024     $22,106     $275,928     $38,236
                                       ========     =======     ========     =======
</TABLE>

    Income taxes reflect the effects of temporary differences that we will
recover in future rates. In August 1985, the PSC issued an order allowing us to
recover deferred carrying charges and depreciation expenses over the remaining
life of Colstrip Unit 3. These recoveries compensated us for

                                      F-15
<PAGE>
NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
unrecovered costs of our investment for the period from January 10, 1984, to
August 29, 1985, when we placed the plant in service. We were amortizing this
asset to expense and recovering in rates $1,831,000 per year. Conservation
programs represent our Demand Side Management programs, which are in rate base
and which we were amortizing to income over a 10-year period. We are recovering
the CTCs, which relate to natural gas properties that we removed from regulation
on November 1, 1997, through rates over 15 years. Investment tax credits and
account balances included in "Other" represent items that we are amortizing
currently or are subject to future regulatory confirmation.

    With the sale of the generating assets, it is our position that any of these
amounts related to electric supply should be recovered from sales proceeds in
excess of book value. For further information on the effects of the sale of our
electric generating assets, see Note 5, "Sale of Electric Generating Assets."
For further information on the removal in 1997 of our natural gas production
assets from rate base, see Note 4, "Deregulation and Regulatory Matters."

CASH AND CASH EQUIVALENTS AND TEMPORARY INVESTMENTS

    We consider all liquid investments with original maturities of three months
or less as cash equivalents, and investments with original maturities over three
months and up to one year as temporary investments. At December 31, 1999, all of
our investments were available for sale, and their fair value approximate the
value reported on the Consolidated Balance Sheet.

ACCOUNTS RECEIVABLE

    Accounts receivable are presented net of allowance for doubtful accounts of
$2,105,000 in 1999 and $1,906,000 in 1998.

STORM DAMAGE AND ENVIRONMENTAL REMEDIATION COSTS

    When losses from costs of storm damage and environmental remediation
obligations for our utility operations are probable and reasonably estimable, we
charge these costs against established, approved operating reserves. We consider
the reserves adequate. The reserves balance at December 31, 1999, was
approximately $11,200,000, and at December 31, 1998, was approximately
$9,300,000. We have included these reserves in "current liabilities" on the
Consolidated Balance Sheet.

INCOME TAXES

    We and our United States subsidiaries file a consolidated United States
income tax return. We allocate consolidated United States income taxes to
utility and nonutility operations as if we filed separate United States income
tax returns for each operation. We defer income taxes to provide for the
temporary differences between the financial reporting basis and the tax basis of
our assets and liabilities. For further information on income taxes, see
"Regulatory Assets and Liabilities" in this Note 1 and also Note 6, "Income Tax
Expense."

DEFERRED REVENUES

    We defer revenues to account for the timing differences between cash
received and revenues earned and reflect these amounts on the Consolidated
Balance Sheet in "Deferred Revenue." We reflect the current portion of these
amounts in "Other Current Liabilities" on the Consolidated Balance Sheet. We are
recognizing the $257,000,000 prepayment received in January 1999 from a
telecommunications customer and the $106,000,000 payment received in
December 1999 from the Los Angeles Department of Water and Power in revenues
over the original terms of the agreements, approximately 11 years in each case.

                                      F-16
<PAGE>
NOTE 1--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
NET INCOME PER SHARE OF COMMON STOCK

    We compute basic net income per share of common stock for each year based
upon the weighted average number of common shares outstanding. In accordance
with SFAS No. 128, "Earnings per Share," diluted net income per share of common
stock reflects the potential dilution that would occur if securities or other
contracts to issue common stock were exercised or converted into common stock or
resulted in the issuance of common stock that shared in our earnings.

    For comparative purposes, the following table shows consolidated basic net
income per share.

<TABLE>
<CAPTION>
                                                                  YEAR TO DATE
                                                                  DECEMBER 31
                                                         ------------------------------
                                                           1999       1998       1997
                                                         --------   --------   --------
<S>                                                      <C>        <C>        <C>
Continuing Operations..................................   $0.86      $1.11      $0.68
Discontinued Operations................................    0.48       0.36       0.46
                                                          -----      -----      -----
  Consolidated.........................................   $1.34      $1.47      $1.14
                                                          =====      =====      =====
</TABLE>

ASSET IMPAIRMENT

    In accordance with SFAS No. 121, "Accounting for the Impairment of
Long-Lived Assets and for Long-Lived Assets to be Disposed of," we periodically
review long-lived assets for impairment whenever events or changes in
circumstances indicate that we may not recover the carrying amount of an asset.

COMPREHENSIVE INCOME (LOSS)

    FASB defines comprehensive income as all changes to the equity of a business
enterprise during a period, except for those resulting from transactions with
owners. For example, dividend distributions are expected. Comprehensive income
consists of net income and other comprehensive income. Net income includes such
items as income from continuing operations, discontinued operations,
extraordinary items, and cumulative effects of changes in accounting principle.
Other comprehensive income includes foreign currency translations, adjustments
of minimum pension liability, and unrealized gains and losses on certain
investments in debt and equity securities.

    For the years ended December 31, 1999, 1998, and 1997, our only item of
other comprehensive income was foreign currency translation adjustments of the
assets and liabilities of our foreign subsidiaries. These adjustments resulted
in increases to retained earnings of $3,058,000 in 1999, and decreases to
retained earnings of $7,363,000 in 1998 and $2,181,000 in 1997. No current
income tax effects resulted from the adjustments, nor will there be any net
income effects unless we sell a foreign subsidiary.

    Most of the 1998 adjustment was the result of transferring a Canadian
natural gas production company from utility to nonutility operations. Until
November 1, 1997, the property, plant and equipment (PP&E) of that company was
included in our natural gas utility rate base at its original United States
dollar value. After that company was transferred to nonutility operations, we
were no longer required to state its PP&E at original United States dollar
value, but were required, instead, to convert its PP&E at the foreign exchange
rate in effect at the balance sheet date. At the time of the transfer, the
Canadian-United States exchange rate was considerably lower than the rates used
to convert most of the original United States dollar values of that company's
PP&E. Consequently, the adjustment from original to current United States dollar
value decreased other comprehensive income approximately $5,100,000 in 1998.

                                      F-17
<PAGE>
DERIVATIVE FINANCIAL INSTRUMENTS

TRADING AND MARKETING OF ELECTRICITY

    Although we decided in August 1998 to exit the electric trading and
marketing businesses, The Montana Power Trading and Marketing company (MPT&M), a
subsidiary of Entech, remains a party to a single derivative financial
instrument. MPT&M entered into this instrument in June 1998 with an electric
retail customer to manage a portion of the customer's commodity price risk, and
the instrument expires in approximately fifteen months. We do not expect this
instrument to have a material effect on our consolidated financial position,
results of operations, or cash flows.

TRADING AND MARKETING OF CRUDE OIL, NATURAL GAS, AND NATURAL GAS LIQUIDS

    We produce, purchase, transport, and sell crude oil, natural gas, and
natural gas liquids. Changes in the prices of these commodities can affect our
financial results. We manage this exposure to price risk, in part, through
MPT&M's use of derivative financial instruments.

    DERIVATIVE FINANCIAL INSTRUMENTS USED

    We use derivative financial instruments to reduce earnings volatility and
stabilize cash flows by hedging some of the price risk associated with our
nonutility energy commodity-producing assets, contractual commitments for firm
supply, and natural gas transportation agreements. We also use derivative
financial instruments in speculative transactions to seek enhanced profitability
based on expected market movements, as discussed below in "Speculative
Transactions." In all cases, financial swap and option agreements constitute the
principal kinds of derivative financial instruments used for these purposes.

    SWAP AGREEMENTS

    Under a typical swap agreement, we make or receive payments based on the
difference between a specified fixed price and a variable price of crude oil or
natural gas at the time of settlement. The variable price is either a crude oil
or natural gas price quoted on the New York mercantile Exchange or a natural gas
price quoted in Inside FERC's Gas Market Report or other recognized industry
index.

    OPTION AGREEMENTS

    Under a typical option agreement, we make or receive monthly payments based
on the difference between the actual price of crude oil or natural gas and the
price established in a private agreement at the time of execution. Receiving or
making payments is dependent on whether we buy (own or hold) or sell (write or
issue) the option. Buying options involves paying a premium--the price of the
option--and selling options involves receiving a premium. When we use options,
we defer all premiums paid or received and recognize the applicable expenses or
revenues monthly throughout the option term. As of December 31, 1999, our
deferred revenues due to option premiums was $1,700,000.

    HEDGED TRANSACTIONS

    Hedged transactions are those in which we have a position (either current or
anticipated) in an underlying commodity or derivative of that commodity that
exposes us to risk if the price of the underlying item adversely changes. We
enter into these transactions primarily to reduce earnings volatility and
stabilize cash lows. We recognize gains or losses from these derivative
financial instruments in the Consolidated Statement of Income at the same time
that we recognize the revenues or expenses associated with the underlying hedged
item; until then, we do not reflect these gains or losses in our financial
statements. At December 31, 1999, we had unrecognized gains of approximately
$2,100,000 related to these transactions. As of December 31, 1999, we had not
terminated any hedging

                                      F-18
<PAGE>
instrument before the date of the anticipated commodity production, commodity
purchase or sale, or natural gas transportation commitment.

    At December 31, 1999, we had no hedge agreements on natural gas production,
but we did have swap and option agreements on approximately 1,280,000 barrels,
or 46 percent of our estimated nonutility crude oil and natural gas liquids
production through December 2001. In addition, we had swap and option agreements
to hedge approximately 5.0 Bcf or 20.1 percent of our expected delivery
obligations under long-term natural gas sales contracts through December 2000.
At December 31, 1999, we also had sold swap and option agreements to hedge
approximately 25.4 Bcf of our nonutility natural gas pipeline transportation
obligations under contracts through December 2001, and we had purchased swap and
option agreements to hedge approximately 27.4 Bcf of these obligations.

    SPECULATIVE TRANSACTIONS

    We also enter into derivative financial transactions in which we have no
underlying price risk exposure nor any interest in making or taking delivery of
crude oil or natural gas commodities. We try, by these speculative transactions,
to profit from the market movements of the prices of these commodities. In
accordance with EITF Issue No.98-10, "Accounting for Contracts Involved in
Energy Trading and Risk Management Activities," we mark to market all of our
speculative transactions and recognize any corresponding gain or loss in the
Consolidated Statement of Income. Through December 31, 1999, we recorded pretax
gains of approximately $700,000 related to these transactions.

    COUNTERPARTY CREDIT RISK

    Commodity price changes may provide a motive to our counterparties to
default on their delivery or payment obligations to us under our physical and
financial crude oil, natural gas, and natural gas liquids trading instruments.
Our corporate credit risk policy requires us to investigate and monitor the
creditworthiness of our physical and financial trading counterparties.

    INDEPENDENT POWER OPERATIONS

    CES has investments in independent power partnerships, some of which have
entered into derivative financial instruments to hedge interest rate exposure on
floating-rate debt and natural gas price fluctuations. We believe that, as of
December 31, 1999, we have not been exposed to any material adverse effects from
the risks inherent in these instruments.

FAIR VALUE OF FINANCIAL INSTRUMENTS

<TABLE>
<CAPTION>
                                                              1999                    1998
                                                      ---------------------   ---------------------
                                                      CARRYING                CARRYING
                                                       AMOUNT    FAIR VALUE    AMOUNT    FAIR VALUE
                                                      --------   ----------   --------   ----------
                                                                 (THOUSANDS OF DOLLARS)
<S>                                                   <C>        <C>          <C>        <C>
ASSETS:
Investments in independent power projects
  (cost basis only).................................  $  3,504    $  1,641    $    394    $  1,543
Reclamation fund....................................    43,460      43,460      41,542      41,542
Other significant investments.......................    52,523      55,689      83,102      83,102

LIABILITIES:
Company obligated mandatorily redeemable preferred
  securities........................................  $ 65,000    $ 63,206    $ 65,000    $ 69,160
Long-term debt (including due within one year)......   677,467     655,652     794,621     829,870
</TABLE>

                                      F-19
<PAGE>
The following methods and assumptions were used to estimate fair value:

    - Investments in independent power projects--The fair value represents our
      assessment of the present value of net future cash flows embodied in these
      investments, discounted to reflect current market rates of return.

    - Reclamation fund and other investments--The carrying value of most of the
      investments approximates fair value as the investments have short
      maturities or the carrying value equals their cash surrender value. Fair
      value for the remainder of the investments was estimated based on the
      discounted value of the future cash flows expected to be received using a
      rate of return expected on similar current investments.

    - Mandatorily redeemable preferred securities and long-term debt--The fair
      value was estimated using quoted market rates for the same or similar
      instruments. Where quotes were not available, fair value was estimated by
      discounting expected future cash flows using year-end incremental
      borrowing rates.

NOTE 2--CONTINGENCIES

KERR PROJECT

    A FERC order that preceded our sale of the Kerr Project to PPL Montana
required us to implement a plan to mitigate the effect of Kerr Project
operations on fish, wildlife, and habitat. To implement this plan, we were
required to make payments of approximately $135,000,000 between 1985 and 2020,
the term during which we would have been the licensee. The net present value of
the total payments, assuming a 9.5 percent annual discount rate, was
approximately $57,000,000, an amount we recognized as license costs in plant and
long-term debt on the Consolidated Balance Sheet in 1997. A payment of
approximately $15,600,000 for the period from 1985 to 1997 was included in this
amount. In the sale of the Kerr Project, PPL Montana assumed the obligation to
make post-closing license compliance payments; however, we retained the
obligation to make payments regarding pre-closing license compliance payments.

    In December 1998 and January 1999, we asked the United States court of
Appeals for the District of Columbia Circuit to review FERC's orders and the
United States Department of Interior's conditions contained in them. On
September 17, 1999, the court granted the motion of the parties and intervenors
to hold up the appeal pending settlement efforts. In December 1999, we, along
with PPL Montana, the United States Department of the Interior, the Confederated
Salish and Kootenai Tribes (the Tribes), and Trout Unlimited, in a court-ordered
mediation, agreed in principle to settle this litigation.

    A Statement of Agreement containing the principles for settlement of the
disputes underlying the appeals was developed in December 1999. It provides that
its terms are binding against all parties, with the understanding that the
signatory parties will jointly draft additional documents as necessary to
establish the terms of the settlement in detail. The parties are currently in
the process drafting these documents, but the court's procedure requires that
the parties keep the settlement terms confidential. We have paid our settlement
payment under the Statement of Agreement into an escrow account. If the parties
agree on these additional documents, and if FERC approves, in a final
non-appealable order, the settlement terms as reflected in proposed license
amendments, we will dismiss the petitions in the court of appeals, and the
escrow agent will release the payments to the Tribes. In addition, we will
transfer to the Tribes 669 acres of land we own on the Flathead Indian
Reservation. If the parties cannot agree upon the additional documents or FERC
does not approve the proposed license amendments in the form agreed to by the
parties, or if, as a result of the appeal of a FERC order, that order is not
final after a specified period, the money will be returned to us, and the
litigation will resume. The settlement, subject to the conditions described
above, substantially reduces our obligation

                                      F-20
<PAGE>
NOTE 2--CONTINGENCIES (CONTINUED)
to pay for fish, wildlife, and habitat mitigation assigned to the pre-closing
period in the sale of the Kerr Project.

MISCELLANEOUS

    We are parties to various other legal claims, actions, and complaints
arising in the ordinary course of business. We do not expect the conclusion of
any of these matters to have a material adverse effect on our consolidated
financial position, results of operation, or cash flows.

NOTE 3--COMMITMENTS

PURCHASE COMMITMENTS

ELECTRIC UTILITY

    The Public Utilities Regulatory Policies Act (PURPA) requires a public
utility to purchase power from QFs at a rate equal to what it would pay to
generate or purchase power. These QFs are power production or co-generation
facilities that meet size, fuel use, ownership, and operating and efficiency
criteria specified by PURPA. The electric utility has 15 long-term QF contracts
with expiration terms ranging from 2003 through 2031 that require us to make
payments for capacity and energy received at prices currently above market.
Three contracts account for 96 percent of the 101 MWs of capacity provided by
these facilities. Montana's Electric Act designates the above-market portion of
the QF costs as Competitive Transition Costs (CTCs) and allows for their
recovery. For more information about CTCs, see Note 4, "Deregulation and
Regulatory Matters."

    The Asset Purchase Agreement (Agreement) dated as of October 31, 1998, and
amended June 29, 1999 and October 29, 1999, with PPL Montana included the
assignment of our contract with Basin Electric Power Cooperative (Basin) to PPL
Montana. That contract committed us to purchase 98 MWs of seasonal capacity from
Basin from 1994 until November 2010 at prices above current and projected market
prices. However, Basin did not release us from that contract. Consequently, if
PPL Montana were to default, Basin could hold us liable to perform according to
the terms of the contract. Because we believe that PPL Montana will not default,
we do not consider this contract our unconditional purchase obligation.

    The Agreement also included two Wholesale Transition Service Agreements
(WTSAs), effective December 17, 1999. These agreements enable is to fulfill our
obligation to supply power until July 2002 to those customers who will not have
chosen another supplier. One agreement commits us to purchase 200 MWs per hour
through December 2001, and the other agreement to purchase through June 2002 any
power requirements remaining after having received power through the first WTSA,
QFs, and Milltown Dam, which we still own and operate. Both agreements price the
power sold at a market index, with a monthly floor and an annual cap. Assuming a
7.23 percent discount rate and current load forecasts, the net present value of
power purchased under the WTSAs may range from $94,000,000 to $104,000,000 for
2000, $61,000,000 to $69,000,000 for 2001, and $24,000,000 to $27,000,000 for
2002. In accordance with SAS no. 47, "Disclosure of Long-Term Obligations," we
use the lower estimate in the tables below.

NATURAL GAS UTILITY

    The natural gas utility entered into take-or-pay contracts with Montana
natural gas producers to provide adequate supplies of natural gas for our
utility customers. We currently have six of these contracts, with expirations
between 2000 and 2006. If we can supply customers with less expensive natural
gas, we purchase the minimum required by the take-or-pay contracts. The cost of
purchases

                                      F-21
<PAGE>
NOTE 3--COMMITMENTS (CONTINUED)
through take-or-pay contracts is part of those costs submitted to the PSC for
recovery in future rates. Since 1998, the natural gas utility enters only into
one-year take-or-pay contracts, because of the uncertainty about the number and
timing of customers who will choose another natural gas supplier under Montana's
Natural Gas Act.

TRADING AND MARKETING

    Before the sale of our electric generating facilities, MPT&M supplied its
customers with power purchased mainly from our generation facilities.
Anticipating the sale of those facilities, MPT&M entered into two electric
purchase contracts in August 1998. One contract obligates MPT&M to purchase 40
MWs per hour at a fixed rate from October 1999 through May 2001, and the other
to purchase 100 MWs per hour of firm capacity and firm energy at 100 percent
load factor at a market-indexed rate until August 2001. We sell this power to
several large customers with whom we have contracts to supply power at
negotiated rates.

                                      F-22
<PAGE>
OIL AND GAS

    Nonutility oil and natural gas operations have one take-or-pay contract,
expiring in 2006, to purchase natural gas, and contracts with pipeline
companies, with expiration dates between 2000 and 2013, to provide reserve
capacity for natural gas shipments to customers.

    Total payments under these contracts for the prior three years were as
follows:

<TABLE>
<CAPTION>
                                        UTILITY                 NONUTILITY
                                 ----------------------   ----------------------
                                 ELECTRIC   NATURAL GAS   ELECTRIC   NATURAL GAS    TOTAL
                                 --------   -----------   --------   -----------   --------
                                                   (THOUSANDS OF DOLLARS)
<S>                              <C>        <C>           <C>        <C>           <C>
1999...........................  $ 61,274     $  4,069    $26,076      $ 7,898     $ 99,317
1998...........................    50,611        3,508     15,355        4,454       73,928
1997...........................    44,153        7,554         --        3,289       54,996
</TABLE>

    Under the above agreements, the present value of future minimum payments, at
a discount rate of 7.23 percent, is as follows:

<TABLE>
<CAPTION>
                                        UTILITY                 NONUTILITY
                                 ----------------------   ----------------------
                                 ELECTRIC   NATURAL GAS   ELECTRIC   NATURAL GAS    TOTAL
                                 --------   -----------   --------   -----------   --------
                                                   (THOUSANDS OF DOLLARS)
<S>                              <C>        <C>           <C>        <C>           <C>
2000...........................  $102,050     $  4,023    $24,315      $ 7,647     $138,035
2001...........................    69,752        2,312     10,743        4,661       87,468
2002...........................    32,052        1,945         --        2,200       36,197
2003...........................     7,543          317         --        2,051        9,911
2004...........................     7,317          280         --        1,912        9,509
Remainder......................   106,074          502         --       17,594      124,170
                                 --------     --------    -------      -------     --------
                                 $324,788     $  9,379    $35,058      $36,065     $405,290
                                 ========     ========    =======      =======     ========
</TABLE>

COAL

    Northwestern Resources entered into a lignite lease agreement that requires
minimum annual payments of overriding royalty that began in 1991 for $1,125,000,
adjusted quarterly for inflation. The payments will continue until Northwestern
Resources pays the equivalent of $18,750,000, in 1986 dollars. At December 31,
1999, the remaining payments under this agreement were $7,217,000. Under current
mine plans, Northwestern Resources should recoup these payments through lignite
sales.

    Northwestern Resources also agreed to pay the State of Texas $2,250,000 in
May 2000 for a highway relocation that enables it to gain access to lignite
under existing leases.

TELECOMMUNICATIONS

    CONSTRUCTION PROJECTS

    In 1999 and 1998, Touch America contracted with Northern Telecom, Inc.
(Nortel) to install optical electronic equipment of certain fiber-optic
networks. (That equipment transmits pulses of laser light through the fiber to
increase the rate at which data are transmitted.) We expect the installations to
be completed in the fourth quarter of 2000 at a cost of $51,800,000 of which
$28,300,000 was paid in 1999 an 1998 in the aggregate, and $23,500,000 is
scheduled for payment in 2000. In 1999, Touch America also contracted with
Nortel to upgrade a telephone switch in the first quarter of 2000 at a cost of
$3,000,000. TW Wireless (TWW), a joint venture of Touch America and US WEST
Wireless, will lease the switch from Touch America for the life of the venture.

                                      F-23
<PAGE>
    In October 1999, Touch America entered into a contract to construct a
high-speed, fiber-optic network for AT&T Corp (AT&T). The contract allows Touch
America to install its own fiber-optic network at the same time and along the
same routed it is constructing the network for AT&T. The network will span more
than 4,300 miles and will cover six different routes in the West, Pacific
Northwest, Northern Rocky Mountains, and Midwest. The contract contains capped
performance incentives if we meet, and capped penalties if we do not meet,
aggressive completion targets. The first route is scheduled for completion in
the fourth quarter of 2000 and the last route in the second quarter of 2001. We
estimate the cost of the project at $500,000,000, of which approximately
one-half will be expended in 2000. We expect AT&T and other third parties to
reimburse us for approximately 50 percent of the total cost, as stages of the
project are completed.

    JOINT VENTURES

    Touch America has entered into strategic alliances to expand its network and
increase its revenues. In accordance with the agreements governing these
relationships, Touch America is committed to contribute capital at various
times.

    In January 2000, Touch America and AEP Communications LLC, a subsidiary of
American Electric Power, formed a 50-50 joint venture named America Fiber Touch,
LLC (AFT) to connect national and regional fiber-optic networks. The venture's
first project is to construct a 330-mile fiber-optic route between St Louis,
Missouri, and Plano, Illinois, which makes up the Midwest route of the 4,300
mile build-out discussed above. This Midwest route is scheduled for completion
in December 2000, at an estimated cost of $25,000,000, of which Touch America's
portion is $12,500,000.

    In August 1999, Touch America and New Century Energies (NCE) formed a 50-50
joint venture named Northern Colorado Telecommunications LLC to provide a full
range of telecommunication services, including private-line service, to
enterprises in the Denver metropolitan area by the middle of 2000. For the
venture, NCE contributed long-term indefeasible rights of use of its existing
fiber-optic network in the Denver metropolitan area. Touch America will
construct six miles of fiber-optic cable and install optical equipment at an
estimated cost of $10,000,000. In 1999, Touch America contributed $1,500,000 to
the venture and plans to contribute $7,000,000 in 2000 and $1,500,000 in 2001.

    In 1999, Touch America and Iowa Network Services, Inc. formed Iowa
Telecommunications Services, Inc. (ITS). ITS will purchase from a third party
280,422 domestic access lines connected to 296 telephone exchanges in Iowa.
Touch America holds a 31 percent interest in ITS, in which Touch America will
invest approximately $46,000,000. ITS will fund the purchase of access lines ad
telephone exchanges primarily through long-term non-recourse debt, obligating
ITS solely. We expect this transaction to close in the second quarter of 2000,
subject to the satisfaction of various conditions and receipt of required
regulator approvals. In 1999, Touch America loaned ITS $5,000,000 to purchase
computers and licenses, and will loan ITS another $5,000,000 for operations at
payment scheduled for the first four months of 2000. These notes are payable on
demand.

    In August 1999, Touch America and US West Wireless entered into TWW to
provide "one number" wireless telephone service in an eight-state region of the
Pacific Northwest and Upper Midwest. That service provides a customer with one
directory number for cell phone and home or business phone. Touch America holds
approximately a 50 percent interest in the venture and will contribute
approximately $45,000,000 over the next two years toward construction of TWW's
physical infrastructure. Both companies contributed PCS licenses to the venture.

    In November 1999, FTV Communications LLC (FTV), the limited liability
company formed by Touch America, Williams Communications, and Enron Broadband
Services, began an expansion of regeneration sites along the Portland-to-Las
Vegas portion of the fiber-optic route that FTV constructed. FTV expects to
complete the project in mid-2000. Touch America's share of the costs will be
approximately $3,300,000.

                                      F-24
<PAGE>
    EXCHANGES

    In January 2000, Touch America and PF.Net, a privately held
telecommunications company, agreed to an exchange of fiber, conduit, and cash to
expand both companies' fiber-optic networks. Touch America receives
approximately 5,900 route miles of fiber and conduit from PF.Net, in exchange
for 4,400 miles of Touch America's fiber and conduit and a cash payment of
$48,500,000 for the difference in route miles. This exchange will expand Touch
America's network from Los Angeles to San Diego, Phoenix, El Paso, Dallas,
Austin, San Antonio, Houston, New Orleans, Jacksonville, Orlando, Greensboro,
Washington D.C., New York City, Tulsa, Kansas City, and St. Louis. Touch America
paid $4,850,000 down and will pay the remainder as segments of the routes under
construction are completed. Segments are scheduled for completion at various
times in 2000 and 2001.

    INVESTMENTS AND ACQUISITIONS

    In January 2000, Touch America agreed to purchase, from Century Tel Inc.,
400 route miles of fiber-optic network linking Chicago and Detroit through
central and southern Michigan communities for approximately $10,000,000.

    In January 2000, Touch America signed a purchase agreement with Minnesota
PCS, LP (MPCS) to acquire a 25 percent interest in MPCS' wireless telephone
business, which owns PCS licenses in North Dakota, South Dakota, Minnesota, and
Wisconsin. In accordance with the agreement, Touch America expects to make a
$2,700,000 equity payment to MPCS and, over the years 2000-2001, will loan it
$12,000,000 in interest-bearing notes payable on October 1, 2002. The agreement
also obligates Touch America, until 2007, to $7,000,000 in guarantees for loans
made to MPCS by the Rural Telephone Financing Corporation. The guarantees are
callable only upon MPCS' default.

    On March 13, 2000, Touch America signed and agreement with Qwest to acquire
for approximately $190,000,000, subject to certain adjustments, Qwest's
wholesale, private-line and long-distance telecommunications services in US
West's 14-state region, which covers 250,000 customers for voice, data, and
video services with multimedia and high-speed data applications. By this
agreement, Touch America will also acquire a fiber-optic network of 1,800 route
miles and associated optronics and switches. The network will connect to Touch
America's fiber-optic network, and Touch America will offer employment to
Qwest's sales agents in the region. We expect this acquisition to close in
mid-2000, subject to the satisfaction of various conditions and the receipt of
required regulatory approvals.

SALES COMMITMENTS

    Our nonutility oil and natural gas operations have agreed to supply
approximately 81 Bcf of natural gas to four co-generation facilities. These
contracts have expiration dates between 2005 and 2011. We can supply the
remaining natural gas required by these contracts with sufficient proved,
developed, and undeveloped reserves and by our control of commitments to sell
our production.

    We entered into a contract to sell electricity to an industrial customer at
terms that include a fixed price for a portion of the power delivered and an
index-based price for another portion. Approximately three years from now, the
contract provides that we sell all power to our customer at an index-based
price. We have been supplying our customer with power purchased through an
index-based contract between MPT&M and a power generator that remains effective
through July 2001. Our industrial customer has given us usage estimates that do
not exceed the amount of electricity that we are committed to purchase.

    Because the price of power under the index-based purchase contract could
exceed the price of power under the fixed-price portion of our sales contract,
we are subject to commodity price risk. Due to uncertainties relating to the
supply requirements of the sales contract and uncertainties surrounding various
arrangements that would allow us to serve the contractual demand, we are unable
to determine

                                      F-25
<PAGE>
the effects that this contract ultimately may have on our consolidated financial
position, results of operations, or cash flows. We will continue to examine our
options and take steps to mitigate the commodity price risk that we face because
of our fixed-price sales contract.

    MPT&M has agreements, expiring between December 2000 and December 2002, with
four other industrial customers to sell a maximum of approximately 103.8 MWs and
a minimum of 59.3 MWs per hour. MPT&M can supply these customers from power
purchased through contracts with a power generator discussed above under
"Purchase Commitments."

LEASE COMMITMENTS

    On December 30, 1985, we sold our 30 percent share of Colstrip Unit 4 and
agreed to lease back our share under a net, 25-year lease with annual payments
of approximately $32,000,000. We have been accounting for this transaction as an
operating lease. We did not sell this nonutility leasehold interest and its
related assets and liabilities and contract obligations to PPL Montana. We have
no other material minimum operating lease payments. Capitalized leases are not
material and are included in other long-term debt.

    Rental expense for the prior three years, including Colstrip Unit 4, was
$66,000,000 for 1999, $63,000,000 for 1998, and $60,000,000 for 1997.

    We have restated the previously reported 1998 and 1997 rental expenses of
$58,800,000 and $56,600,000 for the inclusion of priority taxes paid in
accordance with our Colstrip Unit 4 Sale Lease-Back Agreement.

NOTE 4--DEREGULATION AND REGULATORY MATTERS

DEREGULATION

    The electric and natural gas utility businesses in Montana are transitioning
to a competitive market in which commodity energy products and related services
are sold directly to wholesale and retail customers. Montana's Electric Act,
passed in 1997, provides that all customers will be able to choose their
electric supplier by July 1, 2002. Montana's Natural Gas Act, also passed in
1997, provides that a utility may voluntarily offer its customers choice of
natural gas suppliers and provide open access. Since restructuring is voluntary,
no deadline for choice exists.

ELECTRIC

    Through December 1999, approximately 900 electric customers representing
more than 1,300 accounts crossing all customer classifications--or approximately
27 percent of our pre-choice electric load--have moved to competitive supply
since the inception of customer choice on July 1, 1998. Residential customers
were eligible to move to choice during the fourth quarter of 1999. However, the
majority of the load associated with our pre-choice electric customers who moved
to other suppliers was predominantly industrial and large commercial customers.

    As required by the Electric Act, we filed a comprehensive transition plan
with the PSC in July 1997. Initial hearings on the filing began in April 1998,
and the issues were separated into two groups: Tier I and Tier II.

    Tier I issues dealt with:

    - Accounting orders;

    - Customer choice for large industrial customers;

    - Pilot programs for the remaining customers; and

                                      F-26
<PAGE>
    - Standards of conduct for utility and nonutility

    affiliates.

    Tier II issues address:

    - The recovery and treatment of the QF purchase-power contract costs, which
      are above-market costs;

    - Regulatory assets associated with our electric generating business; and

    - A review of our electric generating assets sale, including the treatment
      of sale proceeds in excess of the book value of the assets and other
      generation-related transition costs.

    In June 1998, the PSC rendered an order on Tier I issues, and on July 1,
1999, we filed a case with the PSC to resolve Tier II issues. We will update our
Tier II filing as a result of the closing of the sale of our electric generating
assets, but we do not expect an order from the PSC until late 2000.

    With deregulation and the resulting competition, certain generation and
power supply-related costs become stranded, or unrecoverable, absent recovery
from customers as a transition cost. CTCs are generation and power
supply-related costs that we incurred in the regulated environment with the
expectation that we would recover these costs from our customers well into the
future. Included within the CTCs are the following: (1) generation-related
regulatory assets, (2) utility owned generation and other purchase-power
contracts, and (3) our purchase-power contracts with the QFs. We are evaluating
options with respect to the QF contracts to minimize costs and are working on a
number of potential buy-out agreements. The owners of the QF contracts must
approve any agreements related to the contracts. In addition, the PSC must
approve future cost recovery. The Electric Act allows us to issue transition
bonds to refinance CTCs.

    In the implementation of our comprehensive transition plan, we have
initiated litigation in Montana District Court in Butte seeking reversal of a
PSC decision regarding our ability to use tracking mechanisms to ensure fair and
accurate recovery of above-market QF costs and certain other transition costs.
In an order issued as part of its consideration of our transition plan, the PSC
concluded that the Electric Act does not provide for tracking mechanisms and
that transition costs must be mitigated and determined as a final matter in that
transition filing. In the litigation, we also are seeking court clarification on
whether the Electric Act authorized a rate freeze or a rate cap during the
transition period that ends July 1, 2002. The PSC has concluded that the
Electric Act authorized a rate cap, but we disagree with this interpretation.

NATURAL GAS

    Through December 1999, approximately 240 natural gas customers with annual
consumption of 5,000 Dkt or more--or 52 percent of our pre-choice natural gas
supply load--have chosen alternate suppliers since the transition to a
competitive natural gas environment began in 1991.

    In accordance with a 1997 PSC order, we transferred substantially all of our
natural gas utility's production assets to unregulated affiliates in 1997 at an
agreed-upon amount, which was approximately $33,600,000 lower than the book
value of the assets. As a component of CTCs, the PSC is allowing us to recover
from our transportation and distribution customers (a) this $33,600,000
difference between transfer value and book value, and (b) approximately
$25,400,000 of existing regulatory assets related to the natural gas production
assets. In 1998, we issued $62,700,000 in transition bonds to refinance the CTCs
for the benefit of customers. The transition bonds will be retired over
15 years through rate revenues established in accordance with Montana's Natural
Gas Act. The amortization of the assets is proportionate to the repayment of
principal on the bonds, resulting in no net income statement impact. The
transition plan also includes a fixed-price supply contract until July 1, 2002
between our

                                      F-27
<PAGE>
unregulated gas supply operations and our regulated distribution operations to
serve the remaining customers who have not chosen other suppliers.

REGULATORY MATTERS

    Milltown Dam and our electric transmission operations remain subject to FERC
and PSC regulation, and the PSC regulates our electric distribution operations.

    As a Hinshaw pipeline (interstate pipeline exempt from FERC jurisdiction),
our natural gas transportation pipelines are not subject to FERC jurisdiction.
However, we conduct interstate transportation subject to FERC jurisdiction,
through an exception of our Hinshaw status. Presently, FERC has allowed the PSC
to set the rates for this interstate service. Our natural gas distribution and
storage operations remain subject to PSC regulation. In addition, the Alberta
Energy and Utilities Board, the National Energy Board of Canada, and the United
States Department of Energy all must approve the importing of Canadian natural
gas.

    As a public utility, we also are subject to PSC jurisdiction when we issue,
assume, or guarantee securities, or when we create liens on our properties.

ELECTRIC

    FERC

    On March 30, 1998, we filed a request with FERC to increase our open-access
transmission rates and the rates for bundled wholesale electric service to two
rural electric cooperatives. FERC approved an interim increase in rates charged
for transmission service, pending final approval in 2000.

    In January 1999, we reached a rate settlement with one of the cooperatives,
resulting in an immaterial increase in rates for bundled wholesale electric
service. This cooperative moved to another supplier in December 1999.

    In March 1999, we reached a separate settlement with the other cooperative.
Rates did not change as a result of the settlement. The cooperative was able to
retain its right to continue with its separate rate-reduction complaint. We
agreed to assist the cooperative in moving to choice when its full-service
wholesale contract expires in exchange for its agreement to withdraw the
rate-reduction complaint. This cooperative will move to another supplier in
June 2000.

    Finally, on March 11, 1999, we reached a settlement on open-access
transmission rates. This settlement increased transmission rates by
approximately $4,300,000, which had a positive effect on the results of our
transmission operations.

    We will also pursue, through new FERC proceedings, recovery of the
transition costs associated with serving both of the wholesale electric
cooperatives to correspond with our transition-costs recovery proceedings in
Montana.

    PSC

    The Electric Act established a rate freeze for all electric customers,
meaning that transmission and distribution rates cannot be increased until
July 1, 2000. In January 2000, we filed a voluntary rate reduction with the PSC
for approximately $16,700,000 annually, which we would implement by using the
sales proceeds in excess of the book value from the recent generation sale. The
reduction is effective on an interim basis pending PSC review of our Tier II
filing. For additional information on the generation sale, see Note 5, "Sale of
Electric Generating Assets."

                                      F-28
<PAGE>
NATURAL GAS

    On August 12, 1999, we filed a natural gas rate docket with the PSC
requesting, among other matters, an increase in annual revenues of $15,400,000,
with a proposed interim increase of $11,500,000. The filing also proposes:

    - An alternative rate plan;

    - "Trackers" to reflect property taxes and replacement facilities in rates
      on a more timely basis;

    - A change in the allocation of costs to customer classes; and

    - Rate-design changes that include recovery of distribution charges through
      a fixed monthly system charge.

    On December 9, 1999, the PSC approved an interim increase of $7,600,000
regarding the natural gas rate docket discussed above. Since then, we negotiated
a settlement with a group of intervenors concerning this natural gas rate
filing. The settlement allows for an increase of annual revenues of $10,300,000,
which includes the interim increase of $7,600,000. The PSC will discuss the
settlement at a working session in March 2000. If the settlement is acceptable,
the rates will be implemented shortly thereafter.

    On November 17, 1999, we filed a second natural gas rate docket with the PSC
requesting recovery of costs associated with tracking gas costs annually.
Approval by the PSC would result in an increase in annual revenues of
$4,800,000. On December 9, 1999, the PSC approved an interim increase for this
amount until we receive the final order, which we expect by mid-2000.

                                      F-29
<PAGE>
NOTE 5--SALE OF ELECTRIC GENERATING ASSETS

ASSETS SOLD

    On December 17, 1999, in accordance with the Agreement, we sold to PPL
Montana substantially all of our electric generating assets, related contracts,
and associated transmission assets totaling less than 40 miles. This included 11
of our 12 hydroelectric facilities; a storage reservoir; a coal-fired thermal
generating plant at Billings, Montana; all of our interest in three coal-fired
thermal generating plants at Colstrip, Montana; and other related assets,
including inventories associated with the power plants. The total gross capacity
of the hydroelectric facilities and coal-fired thermal generating plants sold to
PPL Montana was 1,314.5 MWs.

    The asset sale did not include the Milltown Dam near Missoula, Montana
(gross capacity of 3 MWs) or any of our QF purchase-power contracts. It also did
not include our leased share of the Colstrip Unit 4 generation or transmission
assets.

    In the sale of these assets, we generally retained all pre-closing
obligations, and PPL Montana assumed all post-closing obligations. However, with
respect to environmental liabilities, PPL Montana assumed all pre-closing
(subject to the indemnification provisions discussed below) and post-closing
environmental liabilities associated with the purchased assets, with three
exceptions for pre-closing liabilities:

    - Payment of fines or penalties imposed by regulatory authorities related to
      pre-closing activity;

    - Liability for pre-closing "off-site" activity, such as transportation,
      disposal, or storage of hazardous material; and

    - Remediation costs of any silts behind the Thompson Falls Dam related to
      pre-closing activity.

    We agreed to indemnify PPL Montana from losses arising from pre-closing
environmental conditions. The indemnity for required remediation of pre-closing
conditions, whether known or unknown at the closing, is limited to:

    - 50 percent of the loss. (Our share of this indemnity obligation at the
      Colstrip Project is limited to our pro-rata share of this 50 percent based
      on our pre-sale ownership share.)

    - A two-year period after closing for unknown conditions. The indemnity for
      required remediation of pre-closing conditions known at the time of the
      closing continues indefinitely.

    - An aggregate amount no greater than 10 percent of the purchase price paid
      for the assets.

    We do not expect this indemnity obligation to have a material adverse effect
on our consolidated financial position, results of operations, or cash flows. We
have accrued the estimated amount of the potential liability associated with
these retained obligations.

CASH PROCEEDS

    The cash proceeds received for the sale of the assets, including pro-rated
adjustments for such items as property taxes, was approximately $758,600,000
(including approximately $1,000,000 received in 2000.) Our transaction costs to
complete the sale amounted to approximately $12,100,000.

    At December 31, 1999, we recorded approximately $219,700,000 as net proceeds
in excess of the book value, based on net cash proceeds of $746,500,000 less
(1) approximately $497,300,000 book value of the assets sold and
(2) approximately $29,500,000 of previously flowed-through tax benefits. We also
recorded an income tax liability of approximately $164,100,000, based on the net
proceeds less the tax basis of the assets sold.

                                      F-30
<PAGE>
    As part of our Tier II filing, we plan to deduct from the regulatory
liabilities approximately $39,300,000 of other generation-related transition
costs and approximately $64,600,000 of regulatory asset transition costs. The
other generation-related transition costs consist mainly of SG&A costs and costs
to retire debt. The regulatory asset transition costs consist mainly of
capitalized conservation costs and carrying charges associated with Colstrip
Unit 3.

    PPL Montana also agreed to purchase 1,058 MWs of additional gross capacity
in Colstrip, Montana from Puget and Portland General. Pursuant to the terms of
the Agreement with PPL Montana, we would receive an additional $152,000,000 from
PPL Montana, for added value, if Puget and Portland General both close their
transactions. The added value would arise from the controlling interest in the
Colstrip Units that PPL Montana would hold, as a result of the combination of
our former assets with those of Puget or Portland General. However, if only
Puget or Portland General--but not both--closes its respective transaction, we
will receive only $117,000,000 from PPL Montana rather than $152,000,000. If
neither Puget or Portland General closes its transaction, the Agreement provides
that, subject to the receipt of required regulatory approvals, PPL Montana will
purchase the portion of our 500-kilovolt Colstrip transmission system not
associated with Colstrip Unit 4. Our sales proceeds from PPL Montana for these
properties would be $97,100,000.

    During February 2000, the Oregon Public Utility Commission indicated that it
would deny Portland General's request to sell its ownership interest in Colstrip
Units 3 and 4 to PPL Montana.

EFFECT ON 1999 EARNINGS

    The asset sale positively affected our electric utility's 1999 earnings
through the reversal of approximately $3,000,000 (after taxes) in interest
expense recorded in prior years relating to Kerr Project liabilities and through
recognition of approximately $10,000,000 in ITC's.

USE OF PROCEEDS

    We have used a portion of the net cash proceeds received (less the sale
proceeds in excess of the book value) for the following general corporate
purposes:

    - Funding utility and nonutility projects, including those involving
      expansion of Touch America;

    - Reducing debt; and

    - Purchasing shares of our common stock.

    For additional information on the purchase of shares of common stock and the
reduction of debt, see Note 7, "Common Stock," and Note 10, "Long-Term Debt."

NOTE 6--INCOME TAX EXPENSE

    Income before income taxes was as follows:

<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31
                                                ------------------------------
                                                  1999       1998       1997
                                                --------   --------   --------
                                                    (THOUSANDS OF DOLLARS)
<S>                                             <C>        <C>        <C>
Income from continuing operations:
  United States...............................  $128,084   $192,059   $125,554
  Other countries.............................     1,167        480        607
                                                --------   --------   --------
                                                 129,251    192,539    126,161
Income from discontinued operations...........    65,158     51,255     64,341
                                                --------   --------   --------
                                                $194,409   $243,794   $190,502
                                                ========   ========   ========
</TABLE>

                                      F-31
<PAGE>
    The provision for income taxes differs from the amount of income tax that
would result by applying the applicable United States statutory federal income
tax rate to pretax income because of the following differences:

<TABLE>
<CAPTION>
                                                       YEAR ENDED DECEMBER 31
                                                   ------------------------------
                                                     1999       1998       1997
                                                   --------   --------   --------
                                                       (THOUSANDS OF DOLLARS)
<S>                                                <C>        <C>        <C>
Computed "expected" income tax expense...........  $68,043    $85,328    $66,675
Adjustments for tax effects of:
  Statutory depletion............................   (3,440)    (4,156)    (2,891)
  Tax credits....................................  (25,775)    (4,722)   (11,645)
  State income tax, net..........................    4,545      7,393      7,147
  Reversal of utility book/tax depreciation......    5,318      2,784      5,636
  Other..........................................   (4,628)    (8,453)    (3,052)
                                                   -------    -------    -------
Actual income tax expense........................  $44,063    $78,174    $61,870
                                                   =======    =======    =======
</TABLE>

    Income tax expense as shown on the Consolidated Statement of Income consists
of the following components:

<TABLE>
<CAPTION>
                                                      YEAR ENDED DECEMBER 31
                                                  ------------------------------
                                                    1999       1998       1997
                                                  --------   --------   --------
                                                      (THOUSANDS OF DOLLARS)
<S>                                               <C>        <C>        <C>
Current:
  United States.................................  $293,319   $88,233    $36,680
  Canada........................................     1,710     1,212        994
  Other countries...............................        30        --      3,684
  State.........................................    53,858    13,462      9,835
                                                  --------   -------    -------
                                                   348,917   102,907     51,193
                                                  --------   -------    -------
Deferred:
  United States.................................  (267,958)  (20,331)     6,491
  Canada........................................     9,930    (1,851)     2,802
  State.........................................   (46,826)   (2,551)     1,384
                                                  --------   -------    -------
                                                  (304,854)  (24,733)    10,677
                                                  --------   -------    -------
                                                    44,063    78,174     61,870
Less:
  Income tax expense attributable to
    discontinued operations.....................    13,233    11,331     13,285
                                                  --------   -------    -------
  Income tax expense attributable to continuing
    operations..................................  $ 30,830   $66,843    $48,585
                                                  ========   =======    =======
</TABLE>

                                      F-32
<PAGE>
    Deferred tax liabilities (assets) are comprised of the following:

<TABLE>
<CAPTION>
                                                                DECEMBER 31
                                                          -----------------------
                                                             1999         1998
                                                          ----------   ----------
                                                          (THOUSANDS OF DOLLARS)
<S>                                                       <C>          <C>
Plant related...........................................   $321,383     $403,832
Investment in nonutility generation projects............      6,171        7,132
Other...................................................     44,520       35,344
                                                           --------     --------
  Gross deferred tax liabilities........................    372,074      446,308
                                                           --------     --------
Coal reclamation........................................    (48,096)     (47,487)
Amortization of gain on sale/leaseback..................    (11,649)     (12,755)
Deferred revenues.......................................   (103,578)          --
Investment tax credit amortization......................    (14,055)     (21,833)
Other...................................................   (204,152)     (59,082)
                                                           --------     --------
  Gross deferred tax assets.............................   (381,530)    (141,157)
                                                           --------     --------
  Net deferred tax (assets) liabilities.................     (9,456)     305,151
  Less current deferred tax assets -- net...............    (18,303)     (18,755)
                                                           --------     --------
Total noncurrent deferred tax liabilities...............   $  8,847     $323,906
                                                           ========     ========
</TABLE>

    The change in net deferred tax liabilities differs from current year
deferred tax expense as a result of the following:

<TABLE>
<CAPTION>
                                                            THOUSANDS OF DOLLARS
                                                            --------------------
<S>                                                         <C>
Change in noncurrent deferred tax.........................        $(315,059)
Regulatory assets related to income taxes.................           61,182
Current deferred tax assets -- net........................              452
Amortization of investment tax credits....................          (21,732)
Other.....................................................          (29,697)
                                                                  ---------
  Deferred tax expense....................................        $(304,854)
                                                                  =========
</TABLE>

NOTE 7--COMMON STOCK

STOCK SPLIT

    On June 22, 1999, the Board of Directors approved a two-for-one split of our
outstanding common stock. As a result of the split, which was effective
August 6, 1999, for all shareholders of record on July 16, 1999, 55,099,015
outstanding shares of common stock were converted to 110,198,030 outstanding
shares of common stock. We have retroactively applied the split to all periods
presented.

SHARE REPURCHASE PROGRAM

    In 1998, the Board of Directors authorized a share-repurchase program over
the next five years to repurchase up to 20,000,000 shares, (approximately
18 percent of our then outstanding common stock) on the open market or in
privately negotiated transactions. As of December 31, 1999, we had 105,536,873
common shares outstanding. The number of shares to be purchased and the timing
of the purchases will be based on the level of cash balances, general business
conditions, and other factors, including alternative investment opportunities.

                                      F-33
<PAGE>
    As a result of this authorization, we entered into a Forward Equity
Acquisition Transaction (FEAT) program with a bank that committed to purchase on
our behalf up to 5,000,000 shares, but not to exceed $125,000,000. On
November 12, 1999, we amended the FEAT program to increase the monetary limit to
$200,000,000. The expiration date of the program is October 31, 2000. Until that
date, when all transactions must be settled, we can elect to fully or partially
settle either on a full physical (cash) or a net share basis. A full physical
settlement would be the purchase of shares from the bank for cash at the bank's
average purchase price, including interest costs less dividends. A net share
settlement would be the exchange of shares between the parties so that the bank
received shares with value equivalent to its original purchase price, including
interest costs less dividends. Only at the time that the transactions are
settled can our capital or outstanding stock be affected, and settlement has no
effect on results of operations.

    Since the FEAT program began and through December 23, 1999, the bank had
acquired for us 4,682,100 shares of our stock. The purchase of these shares
averaged approximately $30.94 per share and ranged from $27.05 per share to
$33.52 per share for a total cost of $144,872,000. On December 23, 1999, we used
proceeds from the sale of our generation assets to effect a full physical
settlement for that amount. We have reflected the shares purchased as treasury
stock on the Consolidated Balance Sheet. As of December 31, 1999, no additional
shares had been acquired under the program.

SHAREHOLDER PROTECTION RIGHTS PLAN

    We have a Shareholder Protection Rights Plan (SPRP) that provides one
preferred share purchase right on each outstanding common share. Each purchase
right entitles the registered holder, upon the occurrence of certain events, to
purchase from us one one-hundredth of a share of Participating Preferred Shares,
A Series, without par value. If it should become exercisable, each purchase
right would have economic terms similar to one share of common stock. The
purchase rights trade with the underlying shares and will, except under certain
circumstances described in the SPRP, expire on June 6, 2009, unless redeemed
earlier or exchanged by us.

DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN

    Our Dividend Reinvestment and Stock Purchase Plan permits participants to:
(a) acquire additional shares of common stock through the reinvestment of
dividends on all or any specified number of common and/or preferred shares
registered in their own names, or through optional cash payments of up to
$60,000 per year; and (b) deposit common and preferred stock certificates into
their Plan accounts for safekeeping. It also allows for other interested
investors (residents of certain states) to make initial purchases of common
shares with a minimum of $100 and a maximum of $60,000 per year.

RETIREMENT SAVINGS PLAN

    We have a Retirement Savings Plan that covers all regular eligible
employees. We contribute, on behalf of the employee, a matching percentage of
the amount contributed to the Plan by the employee. In 1990, we borrowed
$40,000,000 at an interest rate of 9.2 percent to be repaid in equal annual
installments over 15 years. The proceeds of the loan were lent on similar terms
to the Plan Trustee, which used the proceeds to purchase 3,844,594 shares of our
common stock. Shares acquired with loan proceeds are allocated to Plan
participants. The loan, which is reflected as long-term debt, is offset by a
similar amount in common shareholders' equity as unallocated stock. Our
contributions plus the dividends on the shares held under the Plan are used to
meet principal and interest payments on the loan with the Plan Trustee. As
principal payments on the loan are made, long-term debt and the offset in common
shareholders' equity are both reduced. At December 31, 1999, 2,500,678 shares
had been allocated to the participants' accounts. We recognize expense for the
Plan using the Shares Allocated

                                      F-34
<PAGE>
Method, and the pretax expense was $4,890,000, $4,923,000, and $5,194,000 for
1999, 1998, and 1997, respectively.

LONG-TERM INCENTIVE PLAN

    Under the Long-Term Incentive Plan, we have issued options to our employees.
Options issued to employees are not reflected in balance sheet accounts until
exercised, at which time:

    (1) authorized, but unissued shares are issued to the employee;

    (2) the capital stock account is credited with the proceeds;

    (3) no charges or credits to income are made.

    Options were granted at the average of the high and low prices as reported
on the New York Stock Exchange composite tape on the date granted and expire ten
years from that date.

    On December 31, 1999, restrictions were removed on the remaining shares of
restricted stock issued in 1994 under the Long-Term Incentive Plan. During 1999,
a grant of 12,000 shares of restricted stock was issued to an individual. The
award is subject to forfeiture or proration if the individual should terminate
employment. Earned awards are reflected as common stock on the Consolidated
Balance Sheet and as compensation expense in the Consolidated Statement of
Income over the period of required employment. At December 31, 1999, 12,000
shares of restricted stock remained.

    Option activity is summarized below:

<TABLE>
<CAPTION>
                                     1999                   1998                   1997
                             --------------------   --------------------   --------------------
                                         WTD AVG                WTD AVG                  WTD
                                         EXERCISE               EXERCISE               EXERCISE
                              SHARES      PRICE      SHARES      PRICE      SHARES      PRICE
                             ---------   --------   ---------   --------   ---------   --------
<S>                          <C>         <C>        <C>         <C>        <C>         <C>
Outstanding, beginning of
  year.....................  2,548,094    $22.71    1,081,330    $11.00    1,389,608    $10.95
  Granted..................    919,510     32.14    2,234,658     24.50           --        --
  Exercised................     88,857     10.83      702,562     11.25      251,506     10.73
  Cancelled................     98,422     24.08       65,332     13.47       56,772     11.01
                             ---------    ------    ---------    ------    ---------    ------
Outstanding, end of year...  3,280,325    $25.63    2,548,094    $22.71    1,081,330    $11.00
                             =========    ======    =========    ======    =========    ======
</TABLE>

    Shares under option at December 31, 1999, are summarized below:

<TABLE>
<CAPTION>
                                                    EXERCISE   EXERCISE              EXERCISE
                                         SHARES      PRICE       LIFE      SHARES     PRICE
EXERCISE PRICE RANGE                    ---------   --------   --------   --------   --------
<S>                                     <C>         <C>        <C>        <C>        <C>
$10.81 to $11.31......................    271,779    $11.06      5 yrs    271,779     $11.06
$18.00 to $19.17......................    488,000     18.56      8 yrs     12,000      18.00
$26.53 to $27.56......................  1,981,814     26.73      9 yrs         --         --
$35.36................................    538,732     35.36     10 yrs         --         --
                                        ---------                         -------
                                        3,280,325                         283,779
                                        =========                         =======
</TABLE>

    As permitted by SFAS No. 123, "Accounting for Stock-Based Compensation," we
have elected to follow Accounting Principles Board Opinion No. 25, "Accounting
for Stock Issued to Employees" (APB 25) and related interpretations in
accounting for our employee stock options. Under APB 25, because the exercise
price of the employee stock options equals the market price of the underlying
stock on the date of grant, no compensation expense is recognized. Disclosure of
pro-forma information regarding net income and earnings per share is required by
SFAS No. 123. This information has been determined as if we had accounted for
our employee stock options under the fair value method of that statement. The
weighted-average fair value of options granted in 1999 and 1998 was $7.03 and
$7.12 per share, respectively. We employed the binomial option-pricing model to
estimate the fair value of each option

                                      F-35
<PAGE>
grant on the date of grant. We used the following weighted-average assumptions
for grants in 1999 and 1998, respectively: (1) risk-free interest rate of
6.35 percent and 5.08 percent; (2) expected life of 9.8 and 10 years;
(3) expected volatility of 24.92 percent and 19.34 percent; and (4) a dividend
yield of 5.97 percent and 6.51 percent. Had we elected to use SFAS No. 123,
compensation expense would have increased $5,280,000 in 1999, $795,000 in 1998,
and $195,000 in 1997. The 1999 pro-forma net income would be $143,456,000 with
basic earnings per common share of $1.31 and diluted earnings per common share
of $1.30. The 1998 and 1997 compensation expense effects on net income and
earnings per share are not significant.

NOTE 8--PREFERRED STOCK

    We have 5,000,000 authorized shares of preferred stock. We cannot declare or
pay dividends on our common stock while we have not either declared and set
apart cumulative dividends or paid dividends on any of our preferred stock.

    Our preferred stock is in three series as detailed in the following table:

<TABLE>
<CAPTION>
                                                     SHARES ISSUED AND       THOUSANDS OF
                                      STATED AND        OUTSTANDING             DOLLARS
                                      LIQUIDATION   -------------------   -------------------
SERIES                                  PRICE*        1999       1998       1999       1998
------                                -----------   --------   --------   --------   --------
<S>                                   <C>           <C>        <C>        <C>        <C>
$6.875..............................    $   100     360,800    360,800    $36,080    $36,080
6.00................................        100     159,589    159,589     15,959     15,959
4.20................................        100      60,000     60,000      6,025      6,025
Discount............................                     --         --       (410)      (410)
                                        -------     -------    -------    -------    -------
                                                    580,389    580,389    $57,654    $57,654
                                        =======     =======    =======    =======    =======
*Plus accumulated dividends.
</TABLE>

    We have the option of redeeming our preferred stock with the consent or
affirmative vote of the holders of a majority of the common shares on 30 days
notice at $110 per share for our $6.00 series and $103 per share for our $4.20
series, plus accumulated dividends. Our $6.875 series is redeemable in whole or
in part, at any time on or after November 1, 2003, for a price beginning at
$103.438 per share, which decreases annually through October 2013. After that
time, the redemption price is $100 per share.

                                      F-36
<PAGE>
NOTE 9--COMPANY OBLIGATED MANDATORILY REDEEMABLE PREFERRED SECURITIES OF
  SUBSIDIARY TRUST

    We established Montana Power Capital I (Trust) as a wholly owned business
trust to issue common and preferred securities and hold Junior Subordinated
Deferrable Interest Debentures (Subordinated Debentures) that we issue. At
December 31, 1999 and 1998, the Trust has issued 2,600,000 units of
8.45 percent Cumulative Quarterly Income Preferred Securities, Series A (QUIPS).
Holders of the QUIPS are entitled to receive quarterly distributions at an
annual rate of 8.45 percent of the liquidation preference value of $25 per
security. The sole asset of the Trust is $67,000,000 of our Subordinated
Debentures, 8.45 percent Series due 2036. The Trust will use interest payments
received on the Subordinated Debentures that it holds to make the quarterly cash
distributions on the QUIPS.

    On or after November 6, 2001, we can wholly redeem the Subordinated
Debentures at any time, or partially redeem the Subordinated Debentures from
time to time. We can also wholly redeem the Subordinated Debentures if certain
events occur before that time. Upon repayment of the Subordinated Debentures at
maturity or early redemption, the Trust Securities must be redeemed. In
addition, we can terminate the Trust at any time and cause the pro rata
distribution of the Subordinated Debentures to the holders of the Trust
Securities.

    Besides our obligations under the Subordinated Debentures, we have agreed to
certain Back-up Undertakings. We have guaranteed, on a subordinated basis,
payment of distributions on the Trust Securities, to the extent the Trust has
funds available to pay such distributions, and we have agreed to pay all of the
expenses of the Trust. Considered together with the Subordinated Debentures, the
Back-up Undertakings constitute a full and unconditional guarantee of the
Trust's obligations under the QUIPS. We are the owner of all the common
securities of the Trust, which constitute 3 percent of the aggregate liquidation
amount of all the Trust Securities.

                                      F-37
<PAGE>
NOTE 10--LONG-TERM DEBT

    The Mortgage and Deed of Trust (Mortgage) imposes a first mortgage lien on
all physical properties owned, exclusive of subsidiary company assets and
certain property and assets specifically excepted. The obligations
collateralized are First Mortgage Bonds, including those First Mortgage Bonds
designated as Secured Medium-Term Notes and those securing Pollution Control
Revenue Bonds.

    Long-term debt consists of the following:

<TABLE>
<CAPTION>
                                                                DECEMBER 31
                                                          -----------------------
                                                             1999         1998
                                                          ----------   ----------
                                                          (THOUSANDS OF DOLLARS)
<S>                                                       <C>          <C>
First Mortgage Bonds:
  7.7% series, due 1999.................................         --     $ 55,000
  7 1/2% series, due 2001...............................   $ 25,000       25,000
  7% series, due 2005...................................     50,000       50,000
  8 1/4% series, due 2007...............................     55,000       55,000
  8.95% series, due 2022................................     50,000       50,000
  Secured Medium-Term Notes-maturing 2000-2025
    7.20%-8.11%.........................................     88,000       88,000
  Pollution Control Revenue Bonds:
    City of Forsyth, Montana
      6 1/8% series,due 2023............................     90,205       90,205
      5.9% series, due 2023.............................     80,000       80,000
Natural Gas Transition Bonds -- 6.20%, due 2012.........     61,015       62,700
ESOP Notes Payable -- 9.2%, due 2004....................     19,431       22,392
Unsecured Medium-Term Notes:
  Series A -- maturing 1999-2022 8.68%-8.9%.............     17,000       19,500
  Series B -- maturing 2001-2026 6.37%-7.96%............    100,000      115,000
Revolving Credit Agreements.............................     17,502       14,241
Other...................................................     28,111       71,779
Unamortized Discount and Premium........................     (3,797)      (4,196)
                                                           --------     --------
                                                            677,467      794,621
Less: Portion due within one year.......................     58,955       96,292
                                                           --------     --------
                                                           $618,512     $698,329
                                                           ========     ========
</TABLE>

    On February 1, 1999, we used the proceeds from asset-backed securities
issued by the special purpose entity (SPE) discussed below to retire $55,000,000
of our 7.7 percent First Mortgage Bonds.

    The electric and natural gas legislation discussed in Note 4, "Deregulation
and Regulatory Matters," authorized the issuance of transition bonds. These
securitization bonds involve the issuance of a non-recourse debt instrument. The
bonds are repaid through, and secured by, a specified component of future
revenues meant to recover the regulatory assets, thereby reducing the credit
risk of the securities. This specific component of revenues is referred to as a
CTC. An April 1998 PSC Financing Order relating to natural gas approved the
issuance of up to $65,000,000 of such bonds. In December 1998, we issued
$62,700,000 of 6.2 percent bonds. We will retire the bonds at six-month
intervals from September 15, 1999, through March 15, 2012. Retirements are in
varying amounts depending on revenues collected from customers. We established
an SPE, which is a wholly owned subsidiary, to issue the bonds. At December 31,
1999, approximately $61,015,000 was outstanding, of

                                      F-38
<PAGE>
NOTE 10--LONG-TERM DEBT (CONTINUED)
which approximately $2,600,000 was classified as due within one year on the
Consolidated Balance Sheet.

    Although the bonds were issued by an SPE and are without recourse to our
general credit, the bonds are shown as debt on the Consolidated Balance Sheet.
Similarly, the right to receive the revenues pledged to secure the bonds is a
specific right of the SPE and not of Montana Power's. However, as a wholly owned
subsidiary, the SPE's revenues and expenses are shown as revenues and expenses
in the Consolidated Statement of Income. Due to the regulatory mechanism for
recognizing the operations of the SPE, including the amortization of the
regulatory assets, we do not expect it to have a material effect on our
consolidated financial position, results of operations, or cash flows.

    To ensure that collections by the SPE are neither more nor less than the
amount necessary to pay interest, principal, and other related issuance costs,
we are required to file for periodic adjustments, or reconciliations, to the
annual amounts to be collected by the SPE. The PSC is required to approve these
adjustments.

    We retired at maturity $2,500,000 of 8.90 percent Series A Unsecured
Medium-Term Notes (MTNs) on October 1, 1999.

    On September 3, 1999, we retired $10,000,000 of our 7.875 percent Series B
Unsecured MTNs due December 23, 2026. We retired an additional $5,000,000 of
these MTNs on October 13, 1999.

    Altana Exploration Ltd. (Altana), a wholly owned Canadian subsidiary,
purchased the stock of a Canadian company for approximately $26,500,000 (United
States dollars) in December 1997. We arranged financing for the purchase through
an Extendible Revolving Term Credit agreement between Altana and the Royal Bank
of Canada. The maximum amount of credit available under this agreement is
$28,000,000 in Canadian dollars. At December 31, 1999 and 1998, the United
States dollar amounts outstanding under the agreement were $17,502,000
($24,259,000 Canadian dollars) and $14,241,000 ($21,796,000 Canadian dollars),
respectively. These amounts are included in "Revolving Credit Agreements" in the
table above. Interest under the agreement is calculated on the Royal Bank's
prime rate that ranged from 6.25 percent to 6.75 percent during 1999.

    In April 1997, we entered into a $160,000,000 Revolving Credit Agreement
(Credit Agreement) for some of our nonutility operations. Under the terms of the
Credit Agreement, the amount of the facility decreased on March 31, 1998,
reducing the borrowing ability to $100,000,000. This Credit Agreement terminates
on April 4, 2000, and all outstanding borrowings must be repaid on this date.
Fixed or variable interest rate options are available under the Credit Agreement
with facility fees or commitment fees on the unused portions.

    As discussed in Note 2, "Contingencies," we recorded long-term debt of
approximately $57,000,000 regarding the Kerr mitigation in June 1997. This
amount represented the net present value of future costs to be paid over the
life of the license. With the sale of the generating assets, payments after the
sale date are no longer our responsibility. Therefore, we reduced debt on the
sale date to approximately $24,300,000. On December 30, 1999, we paid
approximately $14,100,000 of this amount. We included the remaining $10,200,000
in "Other" in the table above, and it is classified as due within one year on
the Consolidated Balance Sheet at December 31, 1999. The final payment for
$10,200,000 occurred on January 3, 2000.

    Scheduled debt repayments for the five years ending December 31, 2004, on
the long-term debt outstanding at December 31, 1999, amount to: $59,000,000 in
2000; $94,000,000 in 2001; $9,000,000 in 2002; $42,000,000 in 2003; $9,000,000
in 2004; and $464,000,000 thereafter. However, as part of the Tier II rate
filing discussed in Note 4, "Deregulation and Regulatory Matters," we indicated
our intention to

                                      F-39
<PAGE>
NOTE 10--LONG-TERM DEBT (CONTINUED)
retire approximately $266,000,000 of long-term debt. We estimate that the
expenses associated with these retirements will be approximately $20,000,000. As
discussed above, we have already repurchased $15,000,000 of our 7.875 percent
Series B Unsecured MTNs due December 23, 2026. In addition, we repurchased
$5,000,000 of 7.25 percent Secured MTNs due January 19, 2024, and $7,000,000 of
8.68 percent Unsecured Series A MTNs due February 7, 2022, in January of 2000.
We plan to retire additional long-term debt throughout 2000.

                                      F-40
<PAGE>
NOTE 11--SHORT-TERM BORROWING

    We have short-term borrowing facilities with commercial banks that provide
both committed and uncommitted lines of credit and the ability to sell
commercial paper. Bank borrowings either bear interest at the lender's floating
base rate and may be repaid at any time, or have fixed rates of interest and
maturities. Commercial paper has fixed rates of interest and maturities.

    At December 31, 1999, we had lines of credit consisting of $210,000,000
committed and $95,000,000 uncommitted. Facility fees or commitment fees on the
committed lines of credit are not significant. We have the ability to issue up
to $145,000,000 of commercial paper based on the total of unused committed lines
of credit and revolving credit agreements.

    At December 31, 1999, we had no short-term obligations. At December 31,
1998, we had notes payable to banks for $40,000,000 at 5.87 percent interest and
commercial paper issued for $29,820,000 at 6.04 percent interest.

NOTE 12--RETIREMENT PLANS

    We maintain trusteed, noncontributory retirement plans covering
substantially all of our employees. Prior to 1998, our retirement benefits are
based on salary, years of service, and social security integration levels. In
1998, we amended our retirement plan's benefit provisions. Our retirement
benefits are now based on salary, age, and years of service.

    Our plan assets consist primarily of domestic and foreign corporate stocks,
domestic corporate bonds, and United States Government securities.

    We also have an unfunded, nonqualified benefit plan for senior management
executives and directors. In December 1998, we froze the benefits earned and
curtailed the plan and accrued approximately $4,300,000 of expense in accordance
with SFAS No. 88, "Employers' Accounting for Settlements and Curtailments of
Defined Benefit Pension Plans."

    As a result of the sale of our electric generating assets to PPL Montana,
454 participants related to electric generation operations were curtailed from
the retirement plan and approximately $22,700,000 in assets were transferred
from the retirement plan trust. Pursuant to the agreement, an estimated
$3,100,000 of assets will be transferred to the PPL trust when the calculation
is finalized in 2000. In accordance with SFAS 88, we calculated a curtailment
gain of approximately $4,100,000 and a settlement gain of approximately
$7,800,000. Due to regulatory accounting treatment, the gains were recorded as
regulatory liabilities or offsets to regulatory assets, resulting in no income
statement impact.

    Together with the majority of our subsidiaries, we also provide certain
health care and life insurance benefits for eligible retired employees. The plan
assets consist primarily of domestic and foreign corporate stocks, domestic
corporate bonds, and United States Government securities. The PSC allows us to
include in rates all utility Other Postretirement Benefits costs on the accrual
basis provided by SFAS No. 106, "Employers' Accounting for Postretirement
Benefits Other Than Pensions."

    We also have a voluntary retirement savings plan in conjunction with our
retirement plans. We make matching contributions, including shares from a
leveraged Employee Stock Ownership Plan arrangement and shares purchased on the
open market. For costs associated with these plans, see Note 7, "Common Stock."

                                      F-41
<PAGE>
NOTE 12--RETIREMENT PLANS (CONTINUED)
    The following tables provide a reconciliation of the changes in the plans'
benefit obligations and fair value of assets over the two-year period ending
December 31, 1999, and a statement of the funded status as of December 31 of
both years:

<TABLE>
<CAPTION>
                                        PENSION BENEFITS       OTHER BENEFITS
                                       -------------------   -------------------
                                         1999       1998       1999       1998
                                       --------   --------   --------   --------
                                                (THOUSANDS OF DOLLARS)
<S>                                    <C>        <C>        <C>        <C>
Change in benefit obligation:
  Benefit obligation at January 1....  $273,401   $247,903   $ 24,512   $22,191
  Service cost on benefits earned....     8,724      8,170        844       776
  Interest cost on projected benefit
    obligation.......................    19,529     18,289      1,776     1,665
  Plan amendments....................     8,578      8,387         --        --
  Actuarial (gain)/loss..............   (32,712)     5,878       (502)    2,149
  Curtailments.......................     2,149
  Settlements........................    (5,712)    (4,303)    (3,093)       --
  Gross benefits paid................   (18,096)        --         --        --
  Gross benefits paid................   (11,707)   (10,923)    (1,909)   (2,269)
                                       --------   --------   --------   -------
  Benefit obligation at
    December 31......................  $242,005   $273,401   $ 21,628   $24,512
                                       ========   ========   ========   =======
Change in plan assets:
  Fair value of plan assets at
    January 1........................  $289,881   $259,059   $  8,782   $ 8,168
  Actual return on plan assets.......    18,600     39,765        226     1,036
  Employer contributions.............        --         --      2,817     1,847
  Acquisitions/divestitures..........   (22,707)        --         --        --
  Gross benefits paid................    (9,546)    (8,943)    (1,909)   (2,269)
                                       --------   --------   --------   -------
  Fair value of plan assets at
    December 31......................  $276,248   $289,881   $  9,916   $ 8,782
                                       ========   ========   ========   =======
Reconciliation of funded status:
  Funded status at end of year.......  $ 34,262   $ 16,463   $(11,712)  $(15,730)
  Unrecognized net:
    Actuarial gain...................   (65,893)   (54,169)    (6,263)   (5,212)
    Prior service cost...............    17,856     12,980      1,822       826
    Transition obligation............      (363)      (337)    11,751    15,440
                                       --------   --------   --------   -------
    Net amount recognized at
      December 31....................  $(14,138)  $(25,063)  $ (4,402)  $(4,676)
                                       ========   ========   ========   =======
</TABLE>

    The following table provides the amounts recognized in the statement of
financial position as of December 31:

<TABLE>
<CAPTION>
                                         PENSION BENEFITS       OTHER BENEFITS
                                        -------------------   -------------------
                                          1999       1998       1999       1998
                                        --------   --------   --------   --------
                                                 (THOUSANDS OF DOLLARS)
<S>                                     <C>        <C>        <C>        <C>
Prepaid benefit cost..................  $  7,571   $  4,028   $     --   $    --
Accrued benefit cost..................   (21,709)   (29,091)    (4,402)   (4,676)
                                        --------   --------   --------   -------
Net amount recognized at December
  31..................................  $(14,138)  $(25,063)  $ (4,402)  $(4,676)
                                        ========   ========   ========   =======
</TABLE>

                                      F-42
<PAGE>
NOTE 12--RETIREMENT PLANS (CONTINUED)
    The following tables provide the components of net periodic benefit cost for
the pension and other postretirement benefit plans, portions of which have been
deferred or capitalized, for fiscal years 1999, 1998, and 1997:

<TABLE>
<CAPTION>
                                                        PENSION BENEFITS
                                                 ------------------------------
                                                   1999       1998       1997
                                                 --------   --------   --------
                                                      THOUSANDS OF DOLLARS
<S>                                              <C>        <C>        <C>
Service cost on benefits earned................  $  8,719   $  8,079   $  6,625
Interest cost on projected benefit
  obligation...................................    19,540     18,238     16,316
Expected return on plan assets.................   (25,650)   (22,870)   (19,900)
Amortization of:
  Transition obligation (asset)................        43        358        383
  Prior service cost (credit)..................     1,741      1,468        965
  Actuarial (gain) loss........................    (1,658)    (1,062)    (1,474)
Immediate recognition of DC conversion.........        --       (142)        --
                                                 --------   --------   --------
Net periodic benefit cost......................     2,735      4,069      2,915
Curtailment (gain) loss........................    (3,751)     3,964        960
Settlement (gain) loss.........................    (7,844)        --         --
                                                 --------   --------   --------
Net periodic benefit cost after curtailments
  and settlements..............................  $ (8,860)  $  8,033   $  3,875
                                                 ========   ========   ========
</TABLE>

<TABLE>
<CAPTION>
                                                              OTHER BENEFITS
                                                      ------------------------------
                                                        1999       1998       1997
                                                      --------   --------   --------
                                                          (THOUSANDS OF DOLLARS)
<S>                                                   <C>        <C>        <C>
Service cost on benefits earned.....................   $  844     $  777     $  571
Interest cost on projected benefit obligation.......    1,776      1,665      1,486
Expected return on plan assets......................     (722)      (671)      (459)
Amortization of:
  Transition obligation (asset).....................    1,098      1,120      1,100
  Prior service cost (credit).......................      177         69         --
  Actuarial (gain) loss.............................     (133)      (274)      (384)
                                                       ------     ------     ------
Net periodic benefit cost...........................    3,040      2,686      2,314
Curtailment gain....................................     (374)        --         --
                                                       ------     ------     ------
Net periodic benefit cost after curtailments and
  settlements.......................................   $2,666     $2,686     $2,314
                                                       ======     ======     ======
</TABLE>

    In 1999, funding for pension costs exceeded SFAS No. 87 "Employers
Accounting for Pensions," pension expense by $1,631,000. In 1998 and 1997,
pension costs exceeded SFAS No. 87 pension expense by $1,780,000 and $5,441,000,
respectively. The PSC allows recovery for the funding of pension costs through
rates. Any differences between funding and expense are deferred for recognition
in future periods. At December 31, 1999, the regulatory liability was
$5,755,000.

                                      F-43
<PAGE>
NOTE 12--RETIREMENT PLANS (CONTINUED)
    The following assumptions were used in the determination of actuarial
present values of the projected benefit obligations:

<TABLE>
<CAPTION>
                                                              PENSION                OTHER
                                                             BENEFITS              BENEFITS
                                                        -------------------   -------------------
                                                          1999       1998       1999       1998
                                                        --------   --------   --------   --------
                                                                 (THOUSANDS OF DOLLARS)
<S>                                                     <C>        <C>        <C>        <C>
Weighted average assumptions as of December 31:
Discount rate.........................................    7.75%      6.75%      7.75%      6.75%
Expected return on plan assets........................    9.00%      9.00%      9.00%      9.00%
Rate of compensation increase.........................    4.40%      3.97%      4.40%      3.75%
</TABLE>

    Assumed health care costs trend rates have a significant effect on the
amounts reported for the health care plans. A 1 percent change in assumed health
care cost trend rates would have the following effects:

<TABLE>
<CAPTION>
                                                        1% INCREASE   1% DECREASE
                                                        -----------   -----------
                                                         (THOUSANDS OF DOLLARS)
<S>                                                     <C>           <C>
Effect on total of service and interest cost component
  of net periodic postretirement health care benefit
  cost................................................      $116         $(108)
Effect on the health care component of the accumulated
  postretirement benefit obligation...................       854          (804)
</TABLE>

    The assumed 2000 health care cost trend rates used to measure the expected
cost of benefits covered by the plans is 7.00 percent. The trend rate decreases
through 2004 to 5 percent.

                                      F-44
<PAGE>
NOTE 13--INFORMATION ON INDUSTRY SEGMENTS

    Our continuing telecommunications operations design, develop, construct,
operate, maintain, and manage a fiber-optic network and wireless facilities;
these operations also sell long-distance, Internet, and private-line services
and equipment. Our continuing utility operations purchase, transmit, and
distribute electricity and natural gas, and the Colstrip Unit 4 division manages
long-term power supply agreements. Continental Energy develops and invests in
independent power projects and other energy-related businesses. In our
discontinued coal operations, we mine and sell coal and lignite; in our
discontinued oil and natural gas operations, we explore for, develop, produce,
process, and sell crude oil and natural gas and trade crude oil, natural gas,
and natural gas liquids. We closed the sale of our discontinued oil and natural
gas operations on October 31, 2000.

    Identifiable assets of each industry segment are principally those assets
used in our operation of those industry segments. Corporate assets are
principally cash and cash equivalents and temporary investments.

    We consider segment information for foreign operations immaterial.

    The following tables present selected information on our industry segments'
continuing operations:

CONTINUING OPERATIONS INFORMATION

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31, 1999
                                                           -----------------------------------
<S>                                                        <C>            <C>        <C>
                                                                 (THOUSANDS OF DOLLARS)
<CAPTION>
                                                               TELE-
CONTINUING                                                 COMMUNICATIONS   ELECTRIC   NATURAL GAS
----------                                                 --------------   --------   -----------
<S>                                                        <C>              <C>        <C>
Sales to unaffiliated customers from continuing
  operations.............................................      $84,350      $459,576     $113,902
Earnings from unconsolidated investments.................       10,392            --           --
Intersegment sales from continuing operations............        1,012        12,457          331
Depreciation, depletion, and amortization................        9,048        53,574        9,279
Pretax operating income from continuing operations.......       35,640       110,666       16,459
Interest expense.........................................            1        38,467       15,229
Interest revenue.........................................          810         3,801          545
Income tax expense.......................................       14,088        11,549          391
Capital expenditures.....................................      153,617        50,167       13,115
Identifiable assets......................................      290,722       910,066      406,413
</TABLE>

<TABLE>
<CAPTION>
CONTINUING (CONTINUED)                                         IPG         OTHER     CORPORATE
----------------------                                     ------------   --------   ---------
<S>                                                        <C>            <C>        <C>
Sales to unaffiliated customers from continuing
  operations.............................................    $75,101      $ 47,665   $     --
Earnings from unconsolidated investments.................     21,042            --         --
Intersegment sales from continuing operations............      1,764         1,665         --
Depreciation, depletion, and amortization................      3,122         4,553         --
Pretax operating income (loss) from continuing
  operations.............................................     23,442       (17,397)        --
Interest expense.........................................         18         3,407         --
Interest revenue.........................................      6,368         6,978         --
Income tax expense.......................................      9,641        (4,839)        --
Capital expenditures.....................................        336            --     15,957
Identifiable assets......................................    203,066        66,935    629,968
</TABLE>

                                      F-45
<PAGE>
NOTE 13--INFORMATION ON INDUSTRY SEGMENTS (CONTINUED)
CONTINUING OPERATIONS INFORMATION

<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31, 1999
                                                     -----------------------------------------
<S>                                                  <C>          <C>           <C>
                                                              (THOUSANDS OF DOLLARS)
<CAPTION>
RECONCILIATION TO CONSOLIDATED                       SEGMENT TOTAL   ADJUSTMENTS(A)   CONSOLIDATED TOTAL
------------------------------                       -------------   --------------   ------------------
<S>                                                  <C>             <C>              <C>
Sales to unaffiliated customers from continuing
  operations.......................................    $ 780,594        $    --            $ 780,594
Earnings from unconsolidated investments...........       31,434             --               31,434
Intersegment sales from continuing operations......       17,229        (17,229)                  --
Depreciation, depletion, and amortization..........       79,576             --               79,576
Pretax operating income from continuing
  operations.......................................      168,810             --              168,810
Interest expense...................................       57,122        (10,037)              47,085
Interest revenue...................................       18,502        (10,037)               8,465
Income tax expense.................................       30,830             --               30,830
Capital expenditures...............................      233,192             --              233,192
Identifiable assets................................    2,507,170        541,573(b)         3,048,743
</TABLE>

------------------------

(a) The amounts indicated include certain eliminations between the business
    segments.

(b) The adjustment of identifiable assets represents the identifiable assets of
    operations that became discontinued in 2000--the consolidated coal and oil
    and natural gas companies.

<TABLE>
<CAPTION>
                                                              YEAR ENDED DECEMBER 31, 1999
                                                          ------------------------------------
<S>                                                       <C>            <C>         <C>
                                                                 (THOUSANDS OF DOLLARS)
<CAPTION>
                                                              TELE-
CONTINUING                                                COMMUNICATIONS   ELECTRIC    NATURAL GAS
----------                                                --------------   ---------   -----------
<S>                                                       <C>              <C>         <C>
Sales to unaffiliated customers from continuing
  operations............................................      $87,748      $ 454,116     $112,603
Earnings from unconsolidated investments................       10,909             --           --
Intersegment sales from continuing operations...........        1,298          4,179          434
Depreciation, depletion, and amortization...............        7,090         56,524        8,705
Pretax operating income from continuing operations......       49,960        124,841       15,019
Interest expense........................................            1         48,903       12,946
Interest revenue........................................          668          3,521          925
Income tax expense......................................       19,772         26,391          168
Capital expenditures....................................       56,203         61,334       21,989
Identifiable assets.....................................      189,560      1,577,583      405,670
</TABLE>

<TABLE>
<CAPTION>
CONTINUING (CONTINUED)                                        IPG          OTHER     CORPORATE
----------------------                                    ------------   ---------   ---------
<S>                                                       <C>            <C>         <C>
Sales to unaffiliated customers from continuing
  operations............................................    $73,707      $  47,988   $     --
Earnings from unconsolidated investments................     89,525             --         --
Intersegment sales from continuing operations...........      2,014          1,913         --
Depreciation, depletion, and amortization...............      9,005          3,921         --
Pretax operating income (loss) from continuing
  operations............................................     84,719        (20,164)        --
Interest expense........................................         58          9,716         --
Interest revenue........................................      4,839            944         --
Income tax expense......................................     32,315        (11,803)        --
Capital expenditures....................................     11,329             --        189
Identifiable assets.....................................    120,675         67,049     42,667
</TABLE>

                                      F-46
<PAGE>
NOTE 13--INFORMATION ON INDUSTRY SEGMENTS (CONTINUED)
CONTINUED OPERATIONS INFORMATION

<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31, 1998
                                                     -----------------------------------------
<S>                                                  <C>          <C>           <C>
                                                              (THOUSANDS OF DOLLARS)
<CAPTION>
RECONCILIATION TO CONSOLIDATED                       SEGMENT TOTAL   ADJUSTMENTS(A)   CONSOLIDATED TOTAL
------------------------------                       -------------   --------------   ------------------
<S>                                                  <C>             <C>              <C>
Sales to unaffiliated customers from continuing
  operations.......................................    $ 776,162       $      --           $ 776,162
Earnings from unconsolidated investments...........      100,434              --             100,434
Intersegment sales from continuing operations......        9,838          (9,838)                 --
Depreciation, depletion, and amortization..........       85,245              --              85,245
Pretax operating income from continuing
  operations.......................................      254,375              --             254,375
Interest expense...................................       71,624          (6,759)             64,865
Interest revenue...................................       10,897          (6,759)              4,138
Income tax expense.................................       66,843              --              66,843
Capital expenditures...............................      151,044              --             151,044
Identifiable assets................................    2,403,204         524,891(b)        2,928,095
</TABLE>

------------------------

(a) The amounts indicated include certain eliminations between the business
    segments.

(b) The adjustment of identifiable assets represents the identifiable assets of
    operations that became discontinued in 2000--the consolidated coal and oil
    and natural gas companies.

                                      F-47
<PAGE>
NOTE 13--INFORMATION ON INDUSTRY SEGMENTS (CONTINUED)

CONTINUING OPERATIONS INFORMATION

<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31, 1997
                                                   -------------------------------------------
<S>                                                <C>            <C>           <C>
                                                              THOUSANDS OF DOLLARS
<CAPTION>
                                                       TELE-
CONTINUING                                         COMMUNICATIONS    ELECTRIC      NATURAL GAS
----------                                         --------------   -----------   --------------
<S>                                                <C>              <C>           <C>
Sales to unaffiliated customers from continuing
  operations.....................................    $   46,691     $  439,199      $  122,852
Earnings from unconsolidated investments.........           435             --              --
Intersegment sales from continuing operations....           799          1,472             474
Depreciation, depletion, and amortization........         2,494         51,674          11,939
Pretax operating income from continuing
  operations.....................................        11,927        111,002          37,994
Interest expense.................................            --         44,571          13,112
Interest revenue.................................           143          5,626           2,174
Income tax expense...............................         4,824         25,969           9,674
Capital expenditures.............................        27,955        122,639          15,081
Identifiable assets..............................       101,581      1,560,055         390,463
</TABLE>

<TABLE>
<CAPTION>
CONTINUING (CONTINUED)                                 IPG           OTHER        CORPORATE
----------------------                             ------------   -----------   --------------
<S>                                                <C>            <C>           <C>
Sales to unaffiliated customers from continuing
  operations.....................................   $   70,932    $      939      $       --
Earnings from unconsolidated investments.........       14,980            --              --
Intersegment sales from continuing operations....        1,820         3,937              --
Depreciation, depletion, and amortization........        2,774           494              --
Pretax operating income (loss) from continuing
  operations.....................................       14,963       (12,693)             --
Interest expense.................................           32         6,043              --
Interest revenue.................................        3,886        16,294              --
Income tax expense...............................        6,762         1,356              --
Capital expenditures.............................          294            --              94
Identifiable assets..............................      156,282         7,987          51,437
</TABLE>

<TABLE>
<CAPTION>
RECONCILIATION TO CONSOLIDATED                     SEGMENT TOTAL   ADJUSTMENTS(A)   CONSOLIDATED TOTAL
------------------------------                     -------------   --------------   ------------------
<S>                                                <C>             <C>              <C>
Sales to unaffiliated customers from continuing
  operations.....................................   $  680,613       $       --         $  680,613
Earnings from unconsolidated investments.........       15,415               --             15,415
Intersegment sales from continuing operations....        8,502           (8,502)                --
Depreciation, depletion, and amortization........       69,375               --             69,375
Pretax operating income from continuing
  operations.....................................      163,193               --            163,193
Interest expense.................................       63,758           (4,133)            59,625
Interest revenue.................................       28,123           (4,133)            23,990
Income tax expense...............................       48,585               --             48,585
Capital expenditures.............................      166,063               --            166,063
Identifiable assets..............................    2,267,805          538,091(b)       2,805,896
</TABLE>

------------------------

(a) The amounts indicated include certain eliminations between the business
    segments.

(b) The adjustment of identifiable assets represents the identifiable assets of
    operations that became discontinued in 2000--the consolidated coal and oil
    and natural gas companies.

                                      F-48
<PAGE>
NOTE 14--SUBSEQUENT EVENTS

DECISION TO SELL ENERGY BUSINESSES

    On March 28, 2000, we announced our decision to sell our energy businesses
through stock sales of these companies. When we complete the sales, Touch
America, Inc. will remain as the entity through which we will continue to
conduct our telecommunications business. We intend to invest the net proceeds
received from the sales of our energy businesses into Touch America.

SALE OF OIL AND NATURAL GAS BUSINESSES; COAL OPERATIONS; AND DISCONTINUED
  OPERATIONS

    OCTOBER 31, 2000 SALE OF OIL AND NATURAL GAS BUSINESSES

    On August 25, 2000, our wholly owned subsidiary, Entech, and Altana
Exploration Company, Entech's wholly owned subsidiary, entered into a Stock and
Asset Purchase Agreement with PanCanadian Petroleum Limited, a Canadian
corporation (PanCanadian Petroleum), and one of PanCanadian Petroleum's wholly
owned subsidiaries, PanCanadian Energy, Inc., a Delaware corporation
(PanCanadian Energy). Pursuant to the Stock and Asset Purchase Agreement,
PanCanadian Petroleum agreed to purchase from us all of the stock and assets of
our Canadian oil and natural gas businesses, and PanCanadian Energy agreed to
purchase from us all of the stock of our United States oil and natural gas
businesses. The transaction closed on October 31, 2000, with a purchase price of
US$475,000,000, subject to certain adjustments. Based on the net book value of
our oil and natural gas businesses, we expect to record a gain on the sale of
these properties during the fourth quarter 2000.

    COAL OPERATIONS

    On September 15, 2000, Entech entered into a Stock Purchase Agreement with
Westmoreland Coal Company, a Delaware corporation (Westmoreland), pursuant to
which Westmoreland agreed to purchase the companies comprising our coal
businesses. The purchase price is $138,000,000, subject to certain adjustments.
We expect the transaction to close at approximately the end of the first quarter
2001 and to record a gain based on the net book value of our coal operations at
that time. However, we are awaiting certain regulatory and other approvals and
can provide no assurance that the transaction will be consummated or, if it is,
that the terms or conditions will not change.

    DISCONTINUED OPERATIONS

    As a result of the definitive agreements to sell our oil and natural gas and
coal operations, we applied discontinued operations accounting to these
operations effective September 1, 2000. Accordingly, we have separately reported
net income after income taxes from oil and natural gas and coal operations in
income from discontinued operations for all periods presented to reflect the
reclassification of these operations as discontinued. In addition, we have
reported cash flows of oil and natural gas and coal operations as "net cash
provided by discontinued operations," "net cash used for discontinued investing
activities," and "net cash provided by (used for) discontinued financing
activities" for all periods presented.

    The following table presents revenues separately for our discontinued oil
and natural gas and coal operations:

<TABLE>
<CAPTION>
                                                    YEAR ENDED DECEMBER 31
                                                ------------------------------
                                                  1999       1998       1997
                                                --------   --------   --------
                                                    (THOUSANDS OF DOLLARS)
<S>                                             <C>        <C>        <C>
Oil and Natural Gas Operations................  $355,532   $239,268   $166,776
Coal Operations...............................   236,782    216,757    201,787
</TABLE>

    At December 31, 1999, total assets related to our discontinued oil and
natural gas and coal operations were $304,537,000 and $237,036,000,
respectively.

                                      F-49
<PAGE>
                   THE MONTANA POWER COMPANY AND SUBSIDIARIES
          SCHEDULE II--VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

<TABLE>
<CAPTION>
                COLUMN A                    COLUMN B           COLUMN C            COLUMN D     COLUMN E
                --------                   ----------   -----------------------   -----------   ---------
                                                               ADDITIONS
                                                        -----------------------
                                           BALANCE AT   CHARGED TO   CHARGED TO                  BALANCE
                                           BEGINNING    COSTS AND      OTHER                    AT CLOSE
               DESCRIPTION                 OF PERIOD     EXPENSES     ACCOUNTS    DEDUCTIONS*   OF PERIOD
               -----------                 ----------   ----------   ----------   -----------   ---------
                                                               (THOUSANDS OF DOLLARS)
<S>                                        <C>          <C>          <C>          <C>           <C>
Year Ended:
December 31, 1999
Reserves deducted in balance sheet from
  assets to which they apply:
Doubtful accounts
  Utility................................    $1,044       $2,010        $            $1,950      $1,104
  Nonutility.............................       862          187         (12)            38         999
                                             ------       ------        ----         ------      ------
    Total................................    $1,906       $2,197        $(12)        $1,988      $2,103
                                             ======       ======        ====         ======      ======
December 31, 1998
Reserves deducted in balance sheet from
  assets to which they apply:
Doubtful accounts
  Utility................................    $  984       $1,749        $            $1,689      $1,044
  Nonutility.............................       827          182         (11)           136         862
                                             ------       ------        ----         ------      ------
    Total................................    $1,811       $1,931        $(11)        $1,825      $1,906
                                             ======       ======        ====         ======      ======
December 31, 1997
Reserves deducted in balance sheet from
  assets to which they apply:
Doubtful accounts
  Utility................................    $  924       $2,349        $            $2,289      $  984
  Nonutility.............................       636          229           6             44         827
                                             ------       ------        ----         ------      ------
    Total................................    $1,560       $2,578        $  6         $2,333      $1,811
                                             ======       ======        ====         ======      ======
</TABLE>

*   Deductions are of the nature for which the reserves were created. In the
    case of the reserve for doubtful accounts, deductions from this reserve are
    reduced by recoveries of amounts previously written off.

                                      F-50
<PAGE>
                           THE MONTANA POWER COMPANY
   SCHEDULE III--COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES--UNAUDITED
                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                      TWELVE MONTHS ENDED DECEMBER 31,
                                            ----------------------------------------------------
                                              1999       1998       1997       1996       1995
                                            --------   --------   --------   --------   --------
<S>                                         <C>        <C>        <C>        <C>        <C>
Net Income................................  $ 96,955   $122,837   $ 76,929   $ 77,522   $ 73,829
Income Taxes..............................    30,830     66,843     48,585     54,807     47,355
                                            --------   --------   --------   --------   --------
                                            $127,785   $189,680   $125,514   $132,329   $121,184
                                            --------   --------   --------   --------   --------
Fixed Charges:
  Interest................................  $ 49,731   $ 66,766   $ 62,072   $ 51,244   $ 49,366
  Amortization of Debt Discount,
    Expense and Premium...................     1,269      1,556      1,538      1,610      1,567
  Rentals.................................    34,682     34,625     34,395     34,166     34,642
                                            --------   --------   --------   --------   --------
                                            $ 85,682   $102,947   $ 98,005   $ 87,020   $ 85,575
                                            --------   --------   --------   --------   --------
Earnings Before Income Taxes
  and Fixed Charges.......................  $213,467   $292,627   $223,519   $219,349   $206,759
                                            ========   ========   ========   ========   ========
Ratio of Earnings to Fixed Charges........     2.49x      2.84x      2.28x      2.52x      2.42x
                                            ========   ========   ========   ========   ========
</TABLE>

                                      F-51
<PAGE>
                           THE MONTANA POWER COMPANY
                     SCHEDULE IV--FINANCIAL DATA-UNAUDITED

    This schedule contains summary financial information extracted from the
Consolidated Balance Sheet at 12/31/99; the Consolidated Income Statement and
the Consolidated Statement of Cash Flows for the twelve months ended 12/31/99,
and is qualified in its entirety by reference to such financial statements.

                     TWELVE MONTHS ENDED DECEMBER 31, 1999

<TABLE>
<CAPTION>
        ITEM
       NUMBER                                 ITEM DESCRIPTION                         AMOUNT
---------------------   ------------------------------------------------------------  ---------
<C>                     <S>                                                           <C>
          1             Total net utility...........................................  1,002,074
          2             Other property and investments..............................    863,103
          3             Total current assets........................................    887,036
          4             Total deferred charges......................................    296,530
          5             Balancing amount for total assets...........................          0
          6             Total assets................................................  3,048,743
          7             Common stock................................................    557,901
          8             Capital surplus, paid in....................................      2,312
          9             Retained earnings...........................................    448,603
         10             Total common stockholders equity............................  1,008,816
         11             Preferred stock subject to mandatory redemption.............     65,000
         12             Preferred stock not subject to mandatory redemption.........     57,654
         13             Long-term debt, net.........................................    617,061
         14             Short-term notes............................................          0
         15             Notes payable...............................................          0
         16             Commercial paper............................................          0
         17             Long-term debt-current portion..............................     58,044
         18             Preferred stock-current portion.............................          0
         19             Obligations under capital leases............................      1,451
         20             Obligations under capital lease-current portion -- 243.158 &
                        159.........................................................        911
         21             Balancing amount for capitalization and liabilities.........  1,239,806
         22             Total capitalization and liabilities........................  3,048,743
         23             gross operating revenue.....................................    812,028
         24             Federal and state income taxes expense......................     30,830
         25             Other operating expenses....................................    643,218
         26             Total operating expenses....................................    674,048
         27             Operating income (loss).....................................    137,980
         28             Other income (loss), net....................................     59,451
         29             Income before interest charges..............................    197,431
         30             Total interest charges......................................     47,085
         31             Net income..................................................    150,346
         32             Preferred stock dividends...................................      3,690
         33             Earnings available for common stock.........................    146,656
         34             Common stock dividends......................................     88,155
         35             Total annual interest charges on all bonds..................     49,881
         36             Cash flow from operations...................................    620,802
         37             Earnings per share--primary.................................       1.34
         38             Earnings per share -- fully diluted.........................       1.33
</TABLE>

                                      F-52
<PAGE>
                                                                         ANNEX A

                          AGREEMENT AND PLAN OF MERGER

    AGREEMENT AND PLAN OF MERGER (this "Agreement") dated as of December 15,
2000 by and between The Montana Power Company, a Montana corporation ("Montana
Power"), The Montana Power L.L.C., a Montana limited liability company
("Subsidiary"), and Touch America Holding, Inc., a Delaware corporation
("Holding Company").

                              W I T N E S S E T H:

    WHEREAS, Montana Power has an authorized capitalization consisting of
(i) 240,000,000 shares of Common Stock, without par value ("Montana Power Common
Stock"), of which 110,355,429 shares are issued whether or not outstanding as of
December 8, 2000, and (ii) 5,000,000 shares of Cumulative Preferred Stock,
without par value ("Montana Power Preferred Stock"), of which 580,389 shares
(consisting of shares of three separate series) are issued and outstanding as of
December 8, 2000; and

    WHEREAS, Subsidiary has an authorized capitalization consisting of 10 units
("Subsidiary Units"), all of which units have been issued and are outstanding
and owned beneficially and of record by Holding Company; and

    WHEREAS, Holding Company has an authorized capitalization consisting of
(i) 240,000,000 shares of Common Stock, par value $.01 per share ("Holding
Company Common Stock"), of which 1,000 shares have been issued and are
outstanding and owned beneficially and of record by Montana Power; and
(ii) 5,000,000 shares of Preferred Stock, par value $.01 per share, none of
which shares are issued or outstanding; and

    WHEREAS, the Boards of Directors and Manager of the respective parties
hereto deem it advisable to merge Montana Power into Subsidiary (the "Merger")
in accordance with the Montana Business Corporation Act and the Montana Limited
Liability Company Act, this Agreement and the Articles of Merger attached hereto
as Exhibit A (the "Articles"), whereby the holders of shares of Montana Power
Common Stock will receive shares of Holding Company Common Stock;

    NOW, THEREFORE, in consideration of the premises and the representations,
warranties and agreements herein contained, the parties hereto agree that
Montana Power shall be merged into Subsidiary, which shall be the entity
surviving such merger, and that the terms and conditions of such merger, the
mode of carrying it into effect, and the manner of converting and exchanging
shares shall be as follows:

                                   ARTICLE I
                                   THE MERGER

    (a) Subject to and in accordance with the provisions of this Agreement, the
Articles shall be executed and verified by each of Montana Power and Subsidiary
and thereafter delivered to the Secretary of State of the State of Montana for
filing, as provided in Section 35-1-816 of the Montana Business Corporation Act
and Section 35-8-1201 of the Montana Limited Liability Company Act. The Merger
shall become effective upon the filing of the Articles with the Montana
Secretary of State (the "Effective Time"). At the Effective Time, the separate
existence of Montana Power shall cease and Montana Power shall be merged with
and into Subsidiary (Subsidiary and Montana Power being sometimes referred to
herein as the "Constituent Entities" and Subsidiary, the entity designated in
the Articles as the surviving entity, being sometimes referred to herein as the
"Surviving Entity").

    (b) Prior to and after the Effective Time, Holding Company, Montana Power
and Subsidiary, respectively, shall take all such action as may be necessary or
appropriate in order to effectuate the Merger. In this connection, Holding
Company shall issue the shares of Holding Company Common

                                      A-1
<PAGE>
Stock which the holders of Montana Power Common Stock shall be entitled to
receive as provided in Article II hereof. If at any time after the Effective
Time any further action is necessary or desirable to carry out the purposes of
this Agreement and to vest the Surviving Entity with full title to all
properties, assets, rights, approvals, immunities and franchises of either of
the Constituent Entities, then the officers and directors of each of the
Constituent Entities as of the Effective Time shall take all such further
action.

                                   ARTICLE II
                   TERMS OF CONVERSION AND EXCHANGE OF SHARES

    At the Effective Time:

    (a) Each share of Montana Power Common Stock (along with one preferred share
purchase right pursuant to The Montana Power Shareholder Protection Rights Plan)
issued, whether or not outstanding, immediately prior to the Merger, shall be
changed and converted into one share of Holding Company Common Stock (along with
one preferred share purchase right pursuant to Holding Company Shareholder
Protection Rights Plan), which shall thereupon be issued, fully paid and
nonassessable.

    (b) Each outstanding option to purchase Montana Power Common Stock (a
"Montana Power Stock Option") issued pursuant to the 1982 Montana Power Key
Employees' Incentive Stock Ownership Plan and Montana Power 1998 Long-Term
Incentive Plan (which at the Effective Time of the Merger will become the
Holding Company Key Employees' Incentive Stock Ownership Plan and Holding
Company Long-Term Incentive Plan), whether vested or not vested or exercisable,
shall be deemed to constitute an option (a "Holding Company Stock Option") to
acquire, on the same terms and conditions as were applicable under such Montana
Power Stock Option (including the price per share), the same number of shares of
Holding Company Common Stock as the holder of such Montana Power Stock Option
would have been entitled to receive upon the exercise of such Montana Power
Stock Option.

    (c) Each share of Montana Power Preferred Stock issued and outstanding
immediately prior to the Merger, shall be changed and converted into one share
of Holding Company Preferred Stock.

    (d) Each share of Holding Company Common Stock issued, whether or not
outstanding, shall be cancelled.

                                  ARTICLE III
              ARTICLES OF ORGANIZATION AND AGREEMENT OF OPERATION

    From and after the Effective Time, and until thereafter amended as provided
by law, the Articles of Organization of Subsidiary as in effect immediately
prior to the Merger shall be and continue to be the Articles of Organization of
the Surviving Entity.

    From and after the Effective Time, the Agreement of Operation of Subsidiary
shall be and continue to be the Agreement of Operation of the Surviving Entity.

                                   ARTICLE IV
                             MANAGERS AND OFFICERS

    The persons who are the Manager and Officers of Subsidiary immediately prior
to the Merger shall continue as Manager and Officers, of the Surviving Entity
and shall continue to be Manager as provided in the Agreement of Operation of
the Surviving Entity.

                                      A-2
<PAGE>
                                   ARTICLE V
                               STOCK CERTIFICATES

    Following the Effective Time, each holder of an outstanding certificate or
certificates theretofore representing shares of Montana Power Common Stock may,
but shall not be required to, surrender the same to Holding Company for
cancellation or transfer, and each such holder or transferee will be entitled to
receive certificates (or book entry shares) representing the same number of
shares of Holding Company Common Stock as the shares of Montana Power Common
Stock previously represented by the stock certificates (or Dividend Reinvestment
and Stock Purchase Plan shares) surrendered. Until so surrendered or presented
for transfer, each outstanding certificate which, prior to the Effective Time,
represented Montana Power Common Stock shall be deemed and treated for all
corporate purposes to represent the ownership of the same number of shares of
Holding Company Common Stock as though such surrender or transfer and exchange
had taken place. The stock transfer books for the Montana Power Common Stock
shall be deemed to be closed at the Effective Time and no transfer of
outstanding shares of Montana Power Common Stock shall thereafter be made on
such books.

                                   ARTICLE VI
                            CONDITIONS OF THE MERGER

    Consummation of the Merger is subject to the satisfaction of the following
conditions:

    (a) The Merger shall have received the approval of the holders of capital
stock or units of each of the Constituent Entities as required by the Montana
Business Corporation Act and The Montana Limited Liability Company Act.

    (b) There shall have been obtained a ruling of the Internal Revenue Service
or an opinion of outside counsel satisfactory to the Board of Directors of
Montana Power and its counsel with respect to the tax consequences of the Merger
and other transactions incident thereto.

    (c) The Holding Company Common Stock to be issued pursuant to the Merger
shall have been approved for listing, upon official notice of issuance, by the
New York and Pacific Stock Exchanges.

                                  ARTICLE VII
                           AMENDMENT AND TERMINATION

    The parties hereto by mutual consent of their respective Boards of Directors
and Managers may amend, modify or supplement this Agreement in such manner as
may be agreed upon by them in writing, at any time before or after approval of
this Agreement by the shareholders of Montana Power; provided, however, that no
such amendment, modification or supplement shall, in the sole judgment of the
Board of Directors of Montana Power, materially and adversely affect the rights
of the shareholders of Montana Power.

    This Agreement may be terminated and the Merger and other transactions
herein provided for abandoned at any time, whether before or after approval of
this Agreement by the shareholders of Montana Power, by action of the Board of
Directors of Montana Power if said Board of Directors determines for any reason
that the consummation of the transactions provided for herein would for any
reason be inadvisable or not in the best interests of Montana Power or its
shareholders.

                                  ARTICLE VIII
                          EFFECTIVE TIME OF THE MERGER

    Subject to the prior satisfaction of the conditions of the Merger set forth
in Article VI hereof and the Authority to terminate this Agreement as set forth
in Article VII hereof, the Constituent Entities and Holding Company shall do all
such acts and things as shall be necessary or desirable in order to

                                      A-3
<PAGE>
make the Effective Time occur as of the close of business on the date of filing
with the Montana Secretary of State but not later than the day of the closing of
the sale of Subsidiary.

                                   ARTICLE IX
                                 MISCELLANEOUS

    This Agreement may be executed in counterparts, each of which when so
executed shall be deemed to be an original, and such counterparts shall together
constitute but one and the same instrument.

    IN WITNESS WHEREOF, Montana Power, Subsidiary and Holding Company, pursuant
to approval and authorization duly given by resolutions adopted by their
respective Boards of Directors and Managers, have each caused this Agreement and
Plan of Merger to be executed by its Chairman, Vice Chairman, President, one of
its Vice Presidents or Managers.

<TABLE>
<S>                                                    <C>  <C>
                                                       THE MONTANA POWER COMPANY

                                                       By:  /s/ ROBERT P. GANNON
                                                            -----------------------------------------
                                                            Name: Robert P. Gannon
                                                            Title: Chief Executive Officer

                                                       THE MONTANA POWER COMPANY, L.L.C.

                                                       By:  /s/ MICHAEL E. ZIMMERMAN
                                                            -----------------------------------------
                                                            Name: Michael E. Zimmerman
                                                            Title: Vice President & General Counsel

                                                       TOUCH AMERICA HOLDINGS, INC.

                                                       By:  /s/ J.P. PEDERSON
                                                            -----------------------------------------
                                                            Name: J.P. Pederson
                                                            Title: Vice President, Chief Financial
                                                            Officer & Treasurer
</TABLE>

                                      A-4
<PAGE>

                                   EXHIBIT A
                                                              TO
                                                 AGREEMENT AND PLAN OF MERGER

                               ARTICLES OF MERGER
                                       OF
                           THE MONTANA POWER COMPANY
                            (A MONTANA CORPORATION)
                                      AND
                           THE MONTANA POWER, L.L.C..
                     (A MONTANA LIMITED LIABILITY COMPANY)

    Pursuant to the provisions of Section 35-8-1201 of the Montana Limited
Liability Act and Section 35-1-816 of the Montana Business Corporations Act, the
undersigned corporation adopts the following Articles of Merger for the purpose
of merging The Montana Power Company with and into Montana Power L.L.C. which
shall be the Surviving Entity.

    1.  The Agreement and Plan of Merger, dated as of October 24, 2000, a copy
of which is attached and incorporated herein by reference, was approved by the
shareholders and member of the undersigned corporations and limited liability
company in the manner prescribed by the Montana Business Corporation Act and
Montana Limited Liability Act.

    2.  The number of shares of capital stock of the corporation and units of
the limited liability company which, at the respective dates of the
aforementioned shareholder and member actions, (a) were outstanding and entitled
to vote and (b) did vote on the Agreement and Plan of Merger, is as follows:

<TABLE>
<CAPTION>
                                                                   NUMBER OF SHARES/UNITS
                                                        ---------------------------------------------
                                                                             VOTED            VOTED
NAME OF CORPORATION                                     OUTSTANDING           FOR            AGAINST
-------------------                                     -----------         --------         --------
<S>                                                     <C>                 <C>              <C>
The Montana Power Company
  Common Stock........................................

The Montana Power Company
  Cumulative Preferred Stock..........................

Total Shares of Stock of
  The Montana Power Company...........................

The Montana Power L.L.C...............................
</TABLE>

                                      A-5
<PAGE>
    3.  The number of shares and units voting in favor of the Plan of Merger was
sufficient approval by that voting group.

DATED:________________________, 2000

<TABLE>
<S>                                                    <C>  <C>
                                                       THE MONTANA POWER COMPANY

                                                       By:
                                                            -----------------------------------------

                                                       By:
                                                            -----------------------------------------

                                                       THE MONTANA POWER, L.L.C.

                                                       By:
                                                            -----------------------------------------

                                                       By:
                                                            -----------------------------------------
</TABLE>

STATE OF MONTANA
County of Silver Bow
)
: ss.
)

                                  VERIFICATION

                                                      __________________________

                                  VERIFICATION

                                                      __________________________

                                      A-6
<PAGE>
                                                                         ANNEX B

                            UNIT PURCHASE AGREEMENT
                         DATED AS OF SEPTEMBER 29, 2000
                                 BY AND BETWEEN
                           NORTHWESTERN CORPORATION,
                          TOUCH AMERICA HOLDINGS, INC.
                                      AND
                           THE MONTANA POWER COMPANY
                              WITH RESPECT TO ALL
                      OUTSTANDING MEMBERSHIP INTERESTS IN
                             THE MONTANA POWER LLC
<PAGE>
                               TABLE OF CONTENTS

    This Table of Contents is not part of the Agreement to which it is attached
but is inserted for convenience only.

<TABLE>
<C>                     <S>                                                           <C>
ARTICLE I SALE OF SHARES AND CLOSING................................................     B-1
                 1.01   Purchase and Sale...........................................     B-1
                 1.02   Purchase Price..............................................     B-1
                 1.03   Closing.....................................................     B-1
                 1.04   Further Assurances; Post-Closing Cooperation................     B-1

ARTICLE II REPRESENTATIONS AND WARRANTIES OF SELLER AND MPC.........................     B-2
                 2.01   Corporate Existence of Seller and MPC.......................     B-2
                 2.02   Authority...................................................     B-2
                 2.03   Existence of the Company....................................     B-2
                 2.04   Capitalization..............................................     B-3
                 2.05   Subsidiaries................................................     B-3
                 2.06   No Conflicts................................................     B-3
                 2.07   Governmental Approvals and Filings..........................     B-4
                 2.08   Books and Records...........................................     B-4
                 2.09   Financial Statements and Condition..........................     B-4
                 2.10   Taxes.......................................................     B-5
                 2.11   Legal Proceedings...........................................     B-6
                 2.12   Compliance With Laws and Orders.............................     B-7
                 2.13   Benefit Plans; ERISA........................................     B-7
                 2.14   Property....................................................     B-8
                 2.15   Intellectual Property Rights................................     B-8
                 2.16   Contracts...................................................     B-8
                 2.17   Licenses....................................................    B-10
                 2.18   Insurance...................................................    B-10
                 2.19   Affiliate Transactions......................................    B-11
                 2.20   Labor and Employment Matters................................    B-11
                 2.21   Environmental Matters.......................................    B-11
                 2.22   Information Supplied........................................    B-11
                 2.23   Vote Required...............................................    B-12
                 2.24   Brokers.....................................................    B-12
                 2.25   Public Utility Holding Company Act..........................    B-12
                 2.26   Regulatory Filings..........................................    B-12
                 2.27   Rights Agreement............................................    B-12
                 2.28   Effect of Restructuring.....................................    B-12

ARTICLE III REPRESENTATIONS AND WARRANTIES OF PURCHASER.............................    B-13
                 3.01   Corporate Existence.........................................    B-13
                 3.02   Authority...................................................    B-13
                 3.03   No Conflicts................................................    B-13
                 3.04   Governmental Approvals and Filings..........................    B-13
                 3.05   Legal Proceedings...........................................    B-13
                 3.06   Purchase for Investment.....................................    B-13
                 3.07   Brokers.....................................................    B-14
                 3.08   Financing...................................................    B-14
                 3.09   Ownership of the Capital Stock..............................    B-14
                 3.10   Exon-Florio.................................................    B-14
                 3.11   Independent Evaluation......................................    B-14
</TABLE>

                                       i
<PAGE>
<TABLE>
<C>                     <S>                                                           <C>
ARTICLE IV COVENANTS OF SELLER AND MPC..............................................    B-14
                 4.01   Regulatory and Other Approvals..............................    B-15
                 4.02   HSR Filings.................................................    B-15
                 4.03   Investigation by Purchaser..................................    B-15
                 4.04   No Solicitations............................................    B-15
                 4.05   Conduct of Business.........................................    B-16
                 4.06   Financial Statements and Reports............................    B-16
                 4.07   Certain Restrictions........................................    B-17
                 4.08   Affiliate Transactions......................................    B-18
                 4.09   Fulfillment of Conditions...................................    B-19
                 4.10   Completion of Restructuring.................................    B-19
                 4.11   Preparation and Mailing of Proxy Statement..................    B-19
                 4.12   Approval of MPC Stockholders................................    B-19
                 4.13   Completion of the Divestiture...............................    B-19
                 4.14   Regulatory Proceedings......................................    B-19
                 4.15   Sale of Colstrip 1, 2, and 3 Transmission System............    B-19
                 4.16   QF Contracts................................................    B-20
                 4.17   MPC Benefit Restoration Plans...............................    B-20
                 4.18   Power Supply................................................    B-20
                 4.19   Generation Sale Proceeds....................................    B-20
                 4.20   Regional Transmission Organization and Independent
                        Transmission Company........................................    B-20
                 4.21   Notification of Certain Matters.............................    B-20
                 4.22   Confidentiality and Standstill Agreements...................    B-20

ARTICLE V COVENANTS OF PURCHASER....................................................    B-21
                 5.01   Regulatory and Other Approvals..............................    B-21
                 5.02   HSR.........................................................    B-21
                 5.03   [INTENTIONALLY OMITTED......................................    B-21
                 5.04   Employee Matters............................................    B-21
                 5.05   Fulfillment of Conditions...................................    B-24
                 5.06   Communication Between the Parties...........................    B-24
                 5.07   Charitable Contributions....................................    B-24
                 5.08   Transaction Structure.......................................    B-24

ARTICLE VI CONDITIONS TO OBLIGATIONS OF PURCHASER...................................    B-25
                 6.01   Representations and Warranties..............................    B-25
                 6.02   Performance.................................................    B-25
                 6.03   Officers' Certificates......................................    B-25
                 6.04   Orders and Laws.............................................    B-25
                 6.05   Regulatory Consents and Approvals...........................    B-25
                 6.06   Third Party Consents........................................    B-25
                 6.07   Completion of the Restructuring.............................    B-25
                 6.08   Assignment of Contracts.....................................    B-25
                 6.09   Benefits Plans..............................................    B-25
                 6.10   Resignation of Seller as Manager of the Company.............    B-25

ARTICLE VII CONDITIONS TO OBLIGATIONS OF SELLER.....................................    B-26
                 7.01   Representations and Warranties..............................    B-26
                 7.02   Performance.................................................    B-26
                 7.03   Officers' Certificates......................................    B-26
                 7.04   Orders and Laws.............................................    B-26
                 7.05   Regulatory Consents and Approvals...........................    B-26
                 7.06   Third Party Consents........................................    B-26
</TABLE>

                                       ii
<PAGE>
<TABLE>
<C>                     <S>                                                           <C>
ARTICLE VIII TAX MATTERS AND POST-CLOSING TAXES.....................................    B-26
                 8.01   Tax Returns.................................................    B-26
                 8.02   Notice of Audit.............................................    B-27
                 8.03   Tax Adjustments.............................................    B-27
                 8.04   Tax Sharing Agreements......................................    B-28
                 8.05   Transfer Taxes..............................................    B-28
                 8.06   Post-Closing Elections......................................    B-28
                 8.07   Post-Closing Transactions not in the Ordinary Course........    B-28
                 8.08   Allocation of Purchase Price................................    B-28
                 8.09   Section 338(h)(10) Election.................................    B-29
                 8.10   Section 338(g) Election.....................................    B-29
                 8.11   Nonforeign Affidavit........................................    B-29
                 8.12   Code Section 754 Election...................................    B-29

ARTICLE IX SURVIVAL; NO OTHER REPRESENTATIONS.......................................    B-29
                 9.01   Survival of Representations, Warranties, Covenants and
                        Agreements..................................................    B-29
                 9.02   No Other Representations....................................    B-29

ARTICLE X INDEMNIFICATION...........................................................    B-29
                10.01   Tax Indemnification.........................................    B-29
                10.02   Indemnification for Restructuring; Divestiture; Oil and Gas
                        Sale........................................................    B-30
                10.03   Other Indemnification.......................................    B-30
                10.04   Special Environmental Indemnity.............................    B-30
                10.05   Special Litigation Indemnity................................    B-31
                10.06   Method of Asserting Claims..................................    B-31
                10.07   Requirements for Indemnity..................................    B-33
                10.08   Exclusivity.................................................    B-33

ARTICLE XI TERMINATION..............................................................    B-33
                11.01   Termination.................................................    B-33
                11.02   Effect of Termination.......................................    B-34
                11.03   Fees and Expenses...........................................    B-35

ARTICLE XII DEFINITIONS.............................................................    B-35
                12.01   Definitions.................................................    B-35

ARTICLE XIII MISCELLANEOUS..........................................................    B-43
                13.01   Notices.....................................................    B-43
                13.02   Entire Agreement............................................    B-44
                13.03   Expenses....................................................    B-44
                13.04   Public Announcements........................................    B-44
                13.05   Confidentiality.............................................    B-44
                13.06   Waiver......................................................    B-45
                13.07   Amendment...................................................    B-45
                13.08   No Third Party Beneficiary..................................    B-45
                13.09   No Assignment; Binding Effect...............................    B-45
                13.10   Headings....................................................    B-45
                13.11   Invalid Provisions..........................................    B-45
                13.12   Governing Law...............................................    B-46
                13.13   Counterparts................................................    B-46
                13.14   Insurance Coverage After Closing............................    B-46
</TABLE>

                                      iii
<PAGE>

<TABLE>
<CAPTION>
                                      EXHIBITS
                                      --------
<S>                     <C>                                    <C>
EXHIBIT A               Officer's Certificate of Seller
EXHIBIT B               Secretary's Certificate of Seller
EXHIBIT C               Officer's Certificate of Purchaser
EXHIBIT D               Secretary's Certificate of Purchaser

                                      ANNEXES
                        ------------------------------------
Annex I                 Financial Statement
Annex II                Budget Principles
</TABLE>

                                       iv
<PAGE>
    This UNIT PURCHASE AGREEMENT dated as of September 29, 2000 is made and
entered into by and between NorthWestern Corporation, a Delaware corporation
("PURCHASER"), Touch America Holdings, Inc., a Delaware corporation ("SELLER")
and The Montana Power Company, a Montana corporation ("MPC"). Capitalized terms
not otherwise defined herein have the meanings set forth in SECTION 12.01.

    WHEREAS, prior to the closing of the transactions contemplated by this
Agreement and as a condition to Purchaser's obligation to effect such closing,
Seller will cause the Restructuring (pursuant to which, among other things, the
Company (as defined below) shall become the owner of all assets and securities
currently owned by MPC, other than Entech and its subsidiaries) to become
effective; and

    WHEREAS, prior to the closing of the transactions contemplated by this
Agreement, Seller will own all of the outstanding membership interests in The
Montana Power LLC, a Montana limited liability company (the "COMPANY"), such
membership interests being referred to herein as the "UNITS"; and

    WHEREAS, Seller desires to sell, and Purchaser desires to purchase, the
Units on the terms and subject to the conditions set forth in this Agreement;

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

                                   ARTICLE I
                           SALE OF SHARES AND CLOSING

    1.01  PURCHASE AND SALE.  Seller agrees to sell to Purchaser, and Purchaser
agrees to purchase from Seller, all of the right, title and interest of Seller
in and to the Units at the Closing on the terms and subject to the conditions
set forth in this Agreement.

    1.02  PURCHASE PRICE.  The aggregate purchase price for the Units is
$602 million (the "PURCHASE PRICE"), payable in immediately available United
States funds at the Closing in the manner provided in SECTION 1.03.

    1.03  CLOSING.  The Closing will take place at the offices of Milbank,
Tweed, Hadley & McCloy LLP, 1 Chase Manhattan Plaza, New York, New York 10005,
or at such other place as Purchaser and Seller mutually agree, at 10:00 A.M.
local time, on the Closing Date. At the Closing, Purchaser will pay the Purchase
Price by wire transfer of immediately available funds to such account as Seller
may reasonably direct by written notice delivered to Purchaser by Seller at
least two (2) Business Days before the Closing Date. Simultaneously, Seller will
assign and transfer to Purchaser all of Seller's right, title and interest in
and to the Units. At the Closing, there shall also be delivered to Seller and
Purchaser the certificates to be delivered under ARTICLES VI and VII.

    1.04  FURTHER ASSURANCES; POST-CLOSING COOPERATION.  (a) Subject to the
terms and conditions of this Agreement, at any time or from time to time after
the Closing, each of the parties hereto shall execute and deliver such other
documents and instruments, provide such materials and information and take such
other actions as may reasonably be necessary, proper or advisable, to the extent
permitted by Law, to fulfill its obligations under this Agreement.

    (b) Following the Closing, each party will provide the other party, its
counsel and its accountants with copies of information or other data relating to
the Business or Condition of MPC and the Company in its possession with respect
to periods prior to the Closing, to the extent that such information or data may
be reasonably required by the requesting party in connection with (i) the
preparation of Tax Returns, (ii) compliance with the requirements of any
Governmental or Regulatory

                                      B-1
<PAGE>
Authority, or (iii) any third party actual or threatened Action or Proceeding.
Further, each party agrees for a period extending six (6) years after the
Closing Date not to destroy or otherwise dispose of any such books, records and
other data (excluding copies of materials previously supplied to the other
party) unless such party shall first offer in writing to surrender such books,
records and other data to the other party and such other party shall not agree
in writing to take possession thereof during the thirty (30) day period after
such offer is made.

    (c) If, in order properly to prepare its Tax Returns, other documents or
reports required to be filed with Governmental or Regulatory Authorities or its
financial statements or to fulfill its obligations hereunder, it is necessary
that a party be furnished with additional information, documents or records
relating to the Business or Condition of MPC and the Company not referred to in
paragraph (b) above, and such information, documents or records are in the
possession or control of the other party, such other party agrees to use its
reasonable best efforts to furnish or make available such information, documents
or records (or copies thereof) at the recipient's request, cost and expense. Any
information obtained by a party hereto in accordance with this paragraph shall
be held confidential by such party in accordance with SECTION 13.05.

    (d) In addition to furnishing information pursuant to paragraph (b) and
(c) of this SECTION 1.04, in order to close the books of MPC, the Company and
the Subsidiaries for accounting purposes, each party agrees to direct its
accounting personnel to provide reasonable cooperation and assistance to any
other party's accounting personnel to accomplish the work necessary to close
such books. Seller and Purchaser also agree to direct their human resources and
payroll personnel to cooperate with, and provide reasonable cooperation and
assistance to each other in connection with, preparing W-2's and other
associated payroll tax or related documents.

                                   ARTICLE II
                REPRESENTATIONS AND WARRANTIES OF SELLER AND MPC

    Seller and MPC, jointly and severally, hereby represent and warrant to
Purchaser as follows:

    2.01  CORPORATE EXISTENCE OF SELLER AND MPC.  Seller is a corporation duly
incorporated, validly existing and in good standing under the Laws of the State
of Delaware and MPC is a corporation duly incorporated, validly existing and in
good standing under the Laws of the State of Montana. Each of Seller and MPC has
full corporate power and authority to execute and deliver this Agreement and to
perform its obligations hereunder and to consummate the transactions
contemplated hereby, including, as to Seller, without limitation, to own, hold,
sell and transfer (pursuant to this Agreement) the Units.

    2.02  AUTHORITY.  The execution and delivery by Seller and MPC of this
Agreement, and the performance by Seller of its obligations hereunder, have been
duly and validly authorized by the Boards of Directors of Seller and MPC, and,
with the exception of the vote referred to in SECTION 2.23, no other corporate
action on the part of Seller or MPC is necessary. This Agreement has been duly
and validly executed and delivered by Seller and MPC and constitutes a legal,
valid and binding obligation of Seller and MPC enforceable against Seller and
MPC in accordance with its terms.

    2.03  EXISTENCE OF THE COMPANY.  The Company is a limited liability company
duly organized, validly existing and in good standing under the Laws of the
State of Montana, and has full corporate power and authority to conduct its
business as and to the extent now conducted and to own, use and lease its Assets
and Properties. MPC is, and prior to and as of the Closing Date, MPC and the
Company will be, duly qualified, licensed or admitted to do business and each is
in good standing in those jurisdictions specified in SECTION 2.03 OF THE
DISCLOSURE SCHEDULE, which are the only jurisdictions in which the ownership,
use or leasing of its Assets and Properties, or the conduct or nature of its
business, makes such qualification, licensing or admission necessary, except for
those jurisdictions in which the adverse effects of all such failures to be
qualified, licensed or admitted and in good standing could not in the aggregate
reasonably be expected to have a material adverse effect on the Business or

                                      B-2
<PAGE>
Condition of MPC and the Company. Seller has prior to the execution of this
Agreement made available to Purchaser true and complete copies of the
certificate of formation of the Company as in effect on the date hereof.

    2.04  CAPITALIZATION.  The authorized capitalization of the Company consists
of the Units. The Units are duly authorized, validly issued, outstanding, fully
paid and nonassessable. On and as of the Closing Date, Seller will own the
Units, beneficially and of record, free and clear of all Liens. Except for this
Agreement and as disclosed in SECTION 2.04 OF THE DISCLOSURE SCHEDULE, as of the
date of this Agreement there are, and on and as of the Closing Date there will
be, no outstanding Options with respect to the Company. The delivery of a
certificate or certificates at the Closing representing the Units in the manner
provided in SECTION 1.03 will transfer to Purchaser good and valid title to the
Units, free and clear of all Liens other than Liens created or suffered to exist
by Purchaser.

    2.05  SUBSIDIARIES.  (a) Each Subsidiary is a corporation validly existing
and in good standing under the Laws of its jurisdiction of incorporation
disclosed in SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE, and has full corporate
power and authority to conduct its business as and to the extent now conducted
and to own, use and lease its Assets and Properties. Each Subsidiary is duly
qualified, licensed or admitted to do business and is in good standing in those
jurisdictions disclosed in SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE, which are
the only jurisdictions in which the ownership, use or leasing of such
Subsidiary's Assets and Properties, or the conduct or nature of its business,
makes such qualification, licensing or admission necessary, except for those
jurisdictions in which the adverse effects of all such failures by MPC or the
Company and the Subsidiaries to be qualified, licensed or admitted and in good
standing could not in the aggregate reasonably be expected to have a material
adverse effect on the Business or Condition of MPC and the Company.
SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE lists for each Subsidiary the amount
of its authorized capital stock, the amount of its outstanding capital stock and
the record owners of such outstanding capital stock. Except as disclosed in
SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE, all of the outstanding shares of
capital stock of each Subsidiary have been duly authorized and validly issued,
are fully paid and nonassessable, and are owned, directly or indirectly by MPC
and, immediately prior to the Closing will be owned, directly or indirectly, by
the Company, beneficially and of record, free and clear of all Liens. Except as
set forth in SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE, there exists no
restriction on the payment of cash dividends by any Subsidiary. Except as
disclosed in SECTION 2.05(a) OF THE DISCLOSURE SCHEDULE, there are, and on and
as of the Closing Date there will be, no outstanding Options with respect to any
Subsidiary. Seller has prior to the execution of this Agreement made available
to Purchaser true and complete copies of the certificate or articles of
incorporation and by-laws (or other comparable corporate charter documents) of
each of the Subsidiaries as in effect on the date hereof.

    (b) Except as set forth on SECTION 2.05(b) OF THE DISCLOSURE SCHEDULE, as of
the Closing Date, the Company will not directly or indirectly beneficially own
more than five percent (5%) of either the equity interests in, or the voting
control of, any Person, other than the Subsidiaries.

    2.06  NO CONFLICTS.  The execution and delivery by Seller and MPC of this
Agreement do not, and the performance by Seller and MPC of their respective
obligations under this Agreement and the consummation of the transactions
contemplated hereby will not:

    (a) conflict with or result in a violation or breach of any of the terms,
conditions or provisions of the certificate or articles of incorporation or
by-laws (or other comparable corporate charter documents) of Seller, MPC, the
Company or any Subsidiary;

    (b) subject to obtaining the consents, approvals and actions, making the
filings and giving the notices disclosed in SECTION 2.07 OF THE DISCLOSURE
SCHEDULE, conflict with or result in a violation or breach of any term or
provision of any Law or Order applicable to Seller, MPC, the Company or any
Subsidiary or any of their respective Assets and Properties (other than such
conflicts, violations or breaches (i) which could not in the aggregate
reasonably be expected to adversely affect the validity or

                                      B-3
<PAGE>
enforceability of this Agreement or to have a material adverse effect on the
Business or Condition of MPC and the Company or (ii) as would occur solely as a
result of the identity or the legal or regulatory status of Purchaser or any of
its Affiliates); or

    (c) except as disclosed in SECTION 2.06 OF THE DISCLOSURE SCHEDULE or as
could not, individually or in the aggregate, reasonably be expected to be
materially adverse to the Business or Condition of MPC and the Company or to
adversely affect the ability of Seller or MPC to consummate the transactions
contemplated hereby or to perform their obligations hereunder, (i) conflict with
or result in a violation or breach of, (ii) constitute (with or without notice
or lapse of time or both) a default under, (iii) require Seller, MPC, the
Company or any Subsidiary to obtain any consent, approval or action of, make any
filing with or give any notice to any Person as a result or under the terms of,
(iv) result in or give to any Person any right of termination, cancellation,
acceleration, non-performance or modification in or with respect to, or
(v) result in the creation or imposition of any Lien upon Seller, MPC, the
Company or any Subsidiary or any of their respective Assets and Properties
under, any Contract or License to which Seller, MPC, the Company or any
Subsidiary is a party or by which any of their respective Assets and Properties
is bound.

    2.07  GOVERNMENTAL APPROVALS AND FILINGS.  Except as disclosed in
SECTION 2.07 OF THE DISCLOSURE SCHEDULE, no consent, approval or action of,
filing with or notice to any Governmental or Regulatory Authority on the part of
Seller, MPC, the Company or any Subsidiary is required in connection with the
execution, delivery and performance of this Agreement or the consummation of the
transactions contemplated hereby, except (i) where the failure to obtain any
such consent, approval or action, to make any such filing or to give any such
notice could not reasonably be expected to adversely affect the ability of
Seller or MPC to consummate the transactions contemplated by this Agreement or
to perform its obligations hereunder, or to have a material adverse effect on
the Business or Condition of MPC and the Company, or (ii) those as would be
required solely as a result of the identity or the legal or regulatory status of
Purchaser or any of its Affiliates.

    2.08  BOOKS AND RECORDS.  The minute books and other similar records of MPC,
the Company and the Subsidiaries as made available to Purchaser prior to the
execution of this Agreement contain a true and complete record, in all material
respects, of all action taken at all meetings and by all written consents in
lieu of meetings of the stockholders, members, the boards of directors and
committees of the boards of directors of MPC, the Company and the Subsidiaries.
The stock transfer ledgers and other similar records of MPC, the Company and the
Subsidiaries as made available to Purchaser prior to the execution of this
Agreement accurately reflect all record transfers prior to the execution of this
Agreement in the capital stock or membership interests of MPC, the Company and
the Subsidiaries.

    2.09  FINANCIAL STATEMENTS AND CONDITION.  (a) Prior to the execution of
this Agreement, Seller has made available to Purchaser true and complete copies
of the following financial statements:

        (i) the unaudited balance sheet of MPC and the Subsidiaries as of
    December 31, 1999 and the related unaudited consolidated statement of
    operations for fiscal years of 1997, 1998 and 1999; and

        (ii) the unaudited balance sheet of MPC and the Subsidiaries as of
    July 31, 2000 (attached as ANNEX I hereto).

Except as set forth in the notes thereto and as disclosed in SECTION 2.09(a) OF
THE DISCLOSURE SCHEDULE, all such financial statements were prepared in
accordance with GAAP and fairly present in all material respects the
consolidated financial condition and statement of operations of MPC and its
consolidated Subsidiaries as of the respective dates thereof and for the
respective periods covered thereby. Except for those Subsidiaries disclosed in
SECTION 2.09(a) OF THE DISCLOSURE SCHEDULE, the financial condition and
statement of operations of each Subsidiary are, and for all periods referred to
in this SECTION 2.09 have been, consolidated with those of MPC. Except as
disclosed in SECTION 2.09(a) OF THE DISCLOSURE SCHEDULE,

                                      B-4
<PAGE>
and except for matters reflected or reserved against in the financial statements
referred to in clauses (i) and (ii) above (or the notes thereto), as of the date
of this Agreement, neither MPC, the Company, nor any Subsidiary has any
liabilities or obligations (whether absolute, accrued, contingent, fixed or
otherwise, or whether due or to become due) of any nature that would be required
by GAAP to be reflected on a consolidated balance sheet of MPC or the Company
and Subsidiaries (including the notes thereto), except liabilities or
obligations (i) that were incurred in the ordinary course of business consistent
with past practice since July 31, 2000, or (ii) that, individually or in the
aggregate, have not had and could not reasonably be expected to have a material
adverse effect on the Business or Condition of MPC and the Company. At and as of
the Closing Date, the total of Indebtedness of the Company, the Subsidiaries and
MPC Natural Gas Funding Trust and the face amount of the outstanding preferred
trust securities of the Montana Power Capital I (Trust) shall not exceed
$488 million.

    (b) Except for the execution and delivery of this Agreement and the
transactions to take place pursuant hereto on or prior to the Closing Date and
as disclosed in SECTION 2.09(b) OF THE DISCLOSURE SCHEDULE, since the Interim
Financial Statement Date the business of MPC and the Subsidiaries has been
operated in all material respects in the ordinary course of business consistent
with past practice and there has not been any material adverse change in the
Business or Condition of MPC, other than those occurring as a result of general
economic or financial conditions or other developments which are not unique to
MPC and the Subsidiaries but also affect to a similar extent other Persons who
participate or are engaged in the lines of business in which MPC and the
Subsidiaries participate or are engaged.

    2.10  TAXES.  (a) Seller, the Company, its Subsidiaries, and all members of
the MPC Affiliated Group, each have filed all material Income Tax Returns
(including, but not limited to, any consolidated federal Tax Return of Seller,
the Company, its Subsidiaries and all members of the MPC Affiliated Group, and
any state or local Income Tax Return that includes Seller, the Company, the
Subsidiaries and all members of the MPC Affiliated Group on a consolidated,
combined or unitary basis) that they were required to file. All such Income Tax
Returns were complete and correct in all material respects. All Income Taxes
owed by Seller, the Company, its Subsidiaries and all members of the MPC
Affiliated Group have been paid. MPC, Seller, the Company and its Subsidiaries
each have filed all material Tax Returns (including, but not limited to, any
federal Tax Return of MPC, Seller, the Company and the Subsidiaries, and any
state or local Tax Return that includes MPC, Seller, the Company, and the
Subsidiaries on a consolidated, combined or unitary basis) that they were
required to file. All such Tax Returns were complete and correct in all material
respects. All Taxes owed by MPC, Seller, the Company and each Subsidiary have
been paid. Except as disclosed in Section 2.10(a) of the Disclosure Schedule,
there are no Liens on any of the Assets or Properties of any of MPC, the Company
or the Subsidiaries that arose in connection with any failure (or alleged
failure) to pay any Tax.

    (b) (i)  Except as disclosed in Section 2.10(b) of the Disclosure Schedule,
there is no dispute or claim concerning any Income Tax liability of any of
Seller, the Company, any Subsidiary, or any member of the MPC Affiliated Group
either (A) claimed or raised by any Governmental or Regulatory Authority in
writing or (B) as to which any of Seller, the Company, the Subsidiaries, or any
member of the MPC Affiliated Group and the directors and officers thereof has
any Knowledge. Section 2.10(b) of the Disclosure Schedule lists all Income Tax
Returns filed by the Company, its Subsidiaries or any member of the MPC
Affiliated Group for Tax periods ending on or after December 31, 1990, (and for
any prior Tax periods to the extent that the statute of limitations for that Tax
period has not lapsed), indicates those Income Tax Returns that have been
audited, and indicates those Income Tax Returns that currently are the subject
of audit. All Income Taxes due with respect to such audits (as described in
Section 2.10(b) of the Disclosure Schedule) have been paid or have been reserved
for in the Financial Statements. Furthermore, all such Income Taxes being
contested are being contested in good faith by appropriate proceedings (as
described in Section 2.10(b) of the Disclosure Schedule).

                                      B-5
<PAGE>
    (ii) Except as disclosed in Section 2.10(b) of the Disclosure Schedule,
there is no dispute or claim concerning any Tax liability of any of MPC, Seller,
the Company, or any Subsidiary either (A) claimed or raised by any Governmental
or Regulatory Authority in writing or (B) as to which any of MPC, Seller, the
Company, or the Subsidiaries, and the directors and officers thereof has any
Knowledge. Section 2.10(b) of the Disclosure Schedule lists all Tax Returns
filed by MPC, the Company and its Subsidiaries for Tax periods ending on or
after December 31, 1990, (and for any prior Tax periods to the extent that the
statute of limitations for that Tax period has not lapsed), indicates those Tax
Returns that have been audited, and indicates those Tax Returns that currently
are the subject of audit. All Taxes due with respect to such audits (as
described in Section 2.10(b) of the Disclosure Schedule) have been paid or have
been reserved for in the Financial Statements. Furthermore, all such Taxes being
contested are being contested in good faith by appropriate proceedings (as
described in SECTION 2.10(b) OF THE DISCLOSURE SCHEDULE).

    (c) Except as disclosed in SECTION 2.10(c) OF THE DISCLOSURE SCHEDULE,
neither MPC, Seller, the Company, any of the Subsidiaries (other than CMPL), nor
any member of the MPC Affiliated Group has waived any statute of limitations in
respect of Income Taxes or agreed to any extension of time with respect to an
Income Tax assessment or deficiency for any Tax period. Except as disclosed in
SECTION 2.10(c) OF THE DISCLOSURE SCHEDULE, CMPL has not waived any statute of
limitations in respect of Income Taxes or agreed to any extension of time with
respect to an Income Tax assessment or deficiency for any Tax period.

    (d) Except as disclosed in SECTION 2.10(d) OF THE DISCLOSURE SCHEDULE, none
of MPC, the Company and its Subsidiaries is or was a party to or liable under
any Income Tax allocation or sharing agreement.

    (e) Except as disclosed in SECTION 2.10(e) OF THE DISCLOSURE SCHEDULE,
neither the Company, any of its Subsidiaries, nor any member of the MPC
Affiliated Group has been a member of an Affiliated Group, filing a consolidated
federal Income Tax Return other than a group the common parent of which is MPC.

    (f) Seller, the Company, the Subsidiaries, and the members of MPC Affiliated
Group have withheld and paid all material Taxes required to have been withheld
and paid and complied in all material respects with all information reporting
and backup withholding requirements, including maintenance of records thereto,
in connection with amounts paid or owing to any employee, independent
contractor, creditor, stockholder, or other Person.

    (g) None of Seller, the Company, the Subsidiaries, or any member of the MPC
Affiliated Group have filed a consent under Code section 341(f) concerning
collapsible corporations.

    (h) MPC, Seller, the Company, and the Subsidiaries have complied with the
normalization rules of accounting in accordance with Code section 168(i)(9).

    (i) For federal Income Tax purposes, the Company is or will be disregarded
as an entity separate from its owners under Treas. Reg. section 301.7701-3(b).
No election with respect to the Company has been or will be made to treat the
Company as anything other than a disregarded entity.

    2.11  LEGAL PROCEEDINGS.

    (a) There are no Actions or Proceedings pending or, to the Knowledge of
Seller and MPC, threatened against, relating to or affecting Seller, MPC, the
Company or any Subsidiary in relation to any of their respective Assets and
Properties which could reasonably be expected (i) to result in the issuance of
an Order restraining, enjoining or otherwise prohibiting or making illegal the
consummation of any of the transactions contemplated by this Agreement or
(ii) except as disclosed in SECTION 2.11(a) OF THE DISCLOSURE SCHEDULE or in
SECTIONS 2.10(b), 2.13(e), 2.20 or 2.21(b), individually or in the aggregate

                                      B-6
<PAGE>
with other such Actions or Proceedings, to have a material adverse effect on the
Business or Condition of MPC and the Company.

    (b) There are no Orders outstanding against MPC, the Company or any
Subsidiary which, individually or in the aggregate with other such Orders, have
had, or could have, a material adverse effect on the Business or Condition of
MPC and the Company.

    2.12  COMPLIANCE WITH LAWS AND ORDERS.  Except as disclosed in SECTION 2.12
OF THE DISCLOSURE SCHEDULE or as described in SECTION 2.21, neither Seller, MPC,
the Company nor any Subsidiary is in violation of or in default under any Law or
Order applicable to Seller, MPC, the Company or any Subsidiary or any of their
respective Assets and Properties the effect of which, individually or in the
aggregate with other such violations and defaults, could reasonably be expected
to be materially adverse to the Business or Condition of MPC and the Company.

    2.13  BENEFIT PLANS; ERISA.  (a) SECTION 2.13(a) OF THE DISCLOSURE SCHEDULE
contains a true and complete list and description of each of the Benefit Plans,
and identifies each of the Benefit Plans that is a Qualified Plan.

    (b) Except as disclosed in SECTION 2.13(b) OF THE DISCLOSURE SCHEDULE,
neither MPC, the Company, any Subsidiary, nor any other corporation or
organization controlled by or under common control with any of the foregoing
within the meaning of Section 4001 of ERISA has at any time contributed to any
"multiemployer plan", as that term is defined in Section 4001 of ERISA and
incurred any withdrawal liability, as that term is defined in Section 4201 of
ERISA, for any plan of the type described in Sections 4063 and 4064 of ERISA or
in Section 413 of the Code (and regulations promulgated thereunder).

    (c) Each of the Benefit Plans is, and its administration is and has been
since inception, in compliance with its terms and, where applicable, with ERISA
and the Code in all respects, except for such failures to comply which,
individually or in the aggregate, could not reasonably be expected to have a
material adverse effect on the Business or Condition of MPC and the Company.

    (d) All contributions and other payments required to be made by Seller, MPC,
the Company or any Subsidiary or any ERISA Affiliate as defined in
SECTION 12.01 hereof to any Benefit Plan with respect to any period ending
before or at or including the Closing Date have been or will be made. Except as
disclosed in SECTION 2.13(d) OF THE DISCLOSURE SCHEDULE all benefit obligations
and liabilities under any Benefit Plan have been or will be reflected in
Financial Statements in accordance with GAAP.

    (e) Except as disclosed in SECTION 2.13(e) OF THE DISCLOSURE SCHEDULE, to
the Knowledge of Seller and MPC, there are no pending claims by or on behalf of
any Benefit Plan, by any employee, director, contractor or consultant of MPC (or
a beneficiary of such an employee, director, contractor or consultant), which
allege violations of Law which, individually or in the aggregate, could
reasonably be expected to result in liability on the part of Purchaser, MPC, the
Company, any Subsidiary or any ERISA Affiliate as defined in SECTION 12.01
hereof or any fiduciary of any such Benefit Plan material to the Business or
Condition of MPC and the Company.

    (f) Except as set forth in SECTION 2.13(f) OF THE DISCLOSURE SCHEDULE,
complete and correct copies of the following documents have been made available
to the Purchaser prior to the execution of this Agreement:

        (i) the Benefit Plans and any related trust agreements and insurance
    contracts;

        (ii) current summary Plan descriptions of each Benefit Plan subject to
    ERISA;

       (iii) the most recent Form 5500 and Schedules thereto for each Benefit
    Plan subject to ERISA reporting requirements;

                                      B-7
<PAGE>
        (iv) the most recent determination of the IRS with respect to the
    qualified status of each Qualified Plan;

        (v) the most recent actuarial report of the qualified actuary of any
    Defined Benefit Plan or any other Benefit Plan with respect to which
    actuarial valuations are conducted; and

        (vi) all Governmental or Regulatory Authority filings with respect to
    any reportable event, excise tax, or other extraordinary event that occurred
    within the past three years and was related to a Benefit Plan.

    (g) Except as set forth in SECTION 2.13(g) OF THE DISCLOSURE SCHEDULE,
(i) neither MPC, the Company nor any Subsidiary is obligated to pay any benefit
under any Benefit Plan solely as a result of a "change in control" as defined in
280G of the Code, (ii) neither MPC, the Company, nor any Subsidiary is obligated
to make any payment that would be disallowed as a deduction under 280G or 162(m)
of the Code, and (iii) neither this transaction, the Restructuring or the
Divestiture shall increase the obligation of MPC, the Company or any Subsidiary
to fund benefits accrued or benefits payable under any Benefit Plan.

    2.14  PROPERTY.  MPC, the Company or a Subsidiary is in possession of and
has good title to, or has valid leasehold interests in or valid rights under
Contract to use, all property used in and individually or in the aggregate with
other such property material to the Business or Condition of MPC and the
Company. All such property is free and clear of all Liens, other than Permitted
Liens and Liens disclosed in SECTION 2.14 OF THE DISCLOSURE SCHEDULE, and is in
all material respects in good working order and condition, ordinary wear and
tear excepted.

    2.15  INTELLECTUAL PROPERTY RIGHTS.  MPC, the Company and the Subsidiaries
currently own, or have license to use, all Intellectual Property material to the
Business or Condition of MPC and the Company without any material restrictions
as to use or enjoyment. As soon as possible after the execution hereof, Seller
will furnish to Purchaser a list of all such Intellectual Property. Neither MPC,
the Company nor any of the Subsidiaries has granted, nor is obligated to grant,
any material license, sub-license or assignment in respect of any of the
Intellectual Property. Neither MPC, the Company nor any of the Subsidiaries is
in breach of any license, sub-license or assignment granted to it in respect of
any Intellectual Property, and to the Knowledge of Seller and MPC, the operation
of the business of MPC, the Company and each Subsidiary does not infringe upon
the intellectual property rights of any other Person, except for such breaches
or infringements that, individually or in the aggregate, could not reasonably be
expected to have a material adverse effect on the Business or Condition of MPC
and the Company.

    2.16  CONTRACTS.  (a) SECTION 2.16(a) OF THE DISCLOSURE SCHEDULE (with
paragraph references corresponding to those set forth below) contains a true and
complete list of each of the following Contracts to which MPC, the Company or
any Subsidiary is a party or by which any of their respective Assets and
Properties is bound:

        (i) all Contracts (excluding Benefit Plans) providing for a commitment
    of employment for a specified or unspecified term or otherwise relating to
    employment or the termination of employment;

        (ii) all Contracts with any Person containing any provision or covenant
    prohibiting or materially limiting the ability of MPC, the Company or any
    Subsidiary to engage in any business activity or compete with any Person or
    prohibiting or materially limiting the ability of any Person to compete with
    MPC, the Company or any Subsidiary;

       (iii) all material partnership, joint venture, shareholders' or other
    similar Contracts with any Person other than Contracts listed pursuant to
    (vii) through (xvi) below;

                                      B-8
<PAGE>
        (iv) all Contracts relating to Indebtedness of MPC, the Company or any
    Subsidiary in excess of $1,000,000 or to preferred stock issued by MPC, the
    Company or any Subsidiary (other than Indebtedness owing to or preferred
    stock owned by MPC, the Company or any wholly-owned Subsidiary);

        (v) all Contracts (other than Contracts listed pursuant to
    (vii) through (xvi) below) relating to (A) the future disposition or
    acquisition by MPC, the Company or any Subsidiary of any Assets and
    Properties individually or in the aggregate in excess of $1,000,000, and
    (B) any merger or other business combination;

        (vi) all collective bargaining or similar labor Contracts;

       (vii) all Contracts active as of June 30, 2000, relating to MPC's
    purchase of natural gas in its capacity as the natural gas supplier to MPC's
    utility customers calling for annual payments in excess of, or potentially
    in excess of $1,000,000 or having a term in excess of one year;

      (viii) all Contracts active as of June 30, 2000, relating to MPC's
    purchase of electrical power in its capacity as the electrical power
    supplier to MPC's utility customers calling for annual payments in excess
    of, or potentially in excess of, $1,000,000 or having a term in excess of
    one year;

        (ix) all Contracts active as of June 30, 2000, relating to MPC's sale of
    electric power as a commodity to third party customers calling for annual
    payments in excess of, or potentially in excess of, $1,000,000 or having a
    term in excess of one year;

        (x) all Contracts active as of June 30, 2000, relating to MPC's electric
    transmission system or the Colstrip Transmission System calling for annual
    payments in excess of, or potentially in excess of, $1,000,000 or having a
    term in excess of one year;

        (xi) all Contracts active as of June 30, 2000, relating to MPC's natural
    gas transmission and storage system calling for annual payments in excess
    of, or potentially in excess of, $1,000,000 or having a term in excess of
    one year;

       (xii) all material Contracts active as of June 30, 2000, relating to
    MPC's interest in Milltown Dam;

      (xiii) all material Contracts active as of June 30, 2000, relating to
    MPC's interest in Colstrip Unit 4;

       (xiv) all material Contracts between MPC and PPL Montana, LLC relating to
    the generation assets sale transaction between MPC and PPL Montana, LLC
    which closed on December 17, 1999;

       (xv) all material Contracts active as of June 30, 2000, to which One Call
    Locators, Ltd. is a party;

       (xvi) all material Contracts active as of June 30, 2000, to which DES is
    a party;

      (xvii) all Contracts, correspondence and other documents relating to the
    buy-out negotiations regarding MPC's contracts to purchase power from QFs,
    including, without limitation, signed letters of intent, whether or not
    binding on either or both parties thereto, offers and counteroffers;

      (xviii) all Contracts relating to MPC's electric and gas transmission and
    distribution business, not included in (i) through (xvi) above, under which
    MPC made payments to the other party in excess of $1,000,000 in 1999 or
    under which, as of the date of this Agreement, MPC expects to make payments
    to the other party in excess of $1,000,000 in 2000;

       (xix) all Contracts relating to MPC's electric and gas transmission and
    distribution business, not included in (i) through (xvi) above, under which
    MPC received payments from the other party

                                      B-9
<PAGE>
    in excess of $1,000,000 in 1999 or under which, as of the date of this
    Agreement, MPC expects to receive payments from the other party in excess of
    $1,000,000 in 2000; and

       (xx) all Contracts (other than this Agreement) that (A) limit or contain
    restrictions on the ability of MPC, the Company or any Subsidiary to declare
    or pay dividends on, to make any other distribution in respect of or to
    issue or purchase, redeem or otherwise acquire its capital stock, to incur
    Indebtedness, to incur or suffer to exist any Lien, to purchase or sell any
    Assets and Properties, to change the lines of business in which it
    participates or engages or to engage in any merger or other business
    combination or (B) require MPC, the Company or any Subsidiary to maintain
    specified financial ratios or levels of net worth or other indicia of
    financial condition.

    (b) Each Contract required to be disclosed in SECTION 2.16(a) OF THE
DISCLOSURE SCHEDULE is in full force and effect and constitutes a legal, valid
and binding agreement, enforceable in accordance with its terms, of MPC, the
Company or a Subsidiary and, to the Knowledge of Seller and MPC, of each other
party thereto; and except as disclosed in SECTION 2.16(b) OF THE DISCLOSURE
SCHEDULE neither MPC, the Company, any Subsidiary nor, to the Knowledge of
Seller and MPC, any other party to such Contract is in violation or breach of or
default under any such Contract (or with notice or lapse of time or both, would
be in violation or breach of or default under any such Contract), the effect of
which, individually or in the aggregate, could reasonably be expected to be
materially adverse to the Business or Condition of MPC and the Company.

    (c) Prior to the Closing Date, Seller and MPC have furnished or made
available to Purchaser a copy of each Contract or other document required to be
disclosed in SECTION 2.16(a) OF THE DISCLOSURE SCHEDULE.

    2.17  LICENSES.  Each of MPC, the Company and the Subsidiaries has obtained
all Licenses used in and, individually or in the aggregate, with other such
Licenses material to the Business or Condition of MPC and the Company. Except as
disclosed in SECTION 2.17 OF THE DISCLOSURE SCHEDULE:

        (i) MPC or the Company and each Subsidiary owns or validly holds all
    such Licenses;

        (ii) each such License is valid, binding and in full force and effect;
    and

       (iii) to the Knowledge of Seller and MPC neither MPC, the Company nor any
    Subsidiary is in default (or with the giving of notice or lapse of time or
    both, would be in default) under any such License in any material respect.

    2.18  INSURANCE.  SECTION 2.18 OF THE DISCLOSURE SCHEDULE contains a true
and complete list of all material insurance policies currently in effect that
insure the business, operations or employees of MPC, the Company or any
Subsidiary or affect or relate to the ownership, use or operation of any of the
Assets and Properties of MPC, the Company or any Subsidiary. Except as set forth
in SECTION 2.18 OF THE DISCLOSURE SCHEDULE and except for failures to maintain
insurance that, individually or in the aggregate, have not had and could not
reasonably be expected to have a material adverse effect on the Business or
Condition of MPC and the Company, each of MPC, the Company, and the Subsidiaries
has been continuously insured with financially responsible insurers, in each
case in such amounts and with respect to such risks and losses as are customary
for companies in the United States conducting the business conducted by MPC, the
Company, and the Subsidiaries. Except as set forth in SECTION 2.18 OF THE
DISCLOSURE SCHEDULE, neither Seller, MPC, the Company nor any of the
Subsidiaries has received any notice of cancellation, termination or suspension
with respect to any of their respective insurance policies, except with respect
to any cancellation, termination or suspension that, individually or in the
aggregate, has not had and could not reasonably be expected to have a material
adverse effect on the Business or Condition of MPC and the Company.

                                      B-10
<PAGE>
    2.19  AFFILIATE TRANSACTIONS.  Except as disclosed in SECTION 2.19 OF THE
DISCLOSURE SCHEDULE, as of Closing, neither MPC, the Company nor the
Subsidiaries will have any Contractual obligations with respect to Seller or its
Affiliates (other than MPC, the Company or the Subsidiaries).

    2.20  LABOR AND EMPLOYMENT MATTERS.  Except as disclosed in SECTION 2.20 OF
THE DISCLOSURE SCHEDULE, no employee of MPC, the Company or any Subsidiary is
presently a member of a collective bargaining unit and, to the Knowledge of
Seller and MPC, there are no threatened or contemplated attempts to organize for
collective bargaining purposes any of the employees of MPC, the Company or any
Subsidiary, and, to the Knowledge of Seller and MPC, there are no threatened or
pending actions or proceedings before any Governmental or Regulatory Authority
relating to such attempts to organize. Since January 1, 1998, there has been no
work stoppage, strike or other concerted action by employees of MPC, the Company
or any Subsidiary which materially adversely affected the Business or Condition
of MPC and the Company. Except as disclosed in SECTION 2.20 OF THE DISCLOSURE
SCHEDULE, there are no unfair labor practice charges or other matters pending
before the National Labor Relations Board to which either MPC or any of the
Subsidiaries is a party.

    2.21  ENVIRONMENTAL MATTERS.  (a) Each of MPC, the Company and the
Subsidiaries has obtained all Licenses which are required under applicable
Environmental Laws in connection with the conduct of the business or operations
of MPC, the Company or such Subsidiary, except where the failure to obtain any
such License could not reasonably be expected to be, individually or in the
aggregate with other such failures, materially adverse to the Business or
Condition of MPC and the Company. Each of such Licenses is in full force and
effect and each of MPC, the Company and the Subsidiaries is in compliance with
the terms and conditions of all such Licenses and with any applicable
Environmental Law, except where the failure to be in compliance could not
reasonably be expected to be, individually or in the aggregate with other such
failures, materially adverse to the Business or Condition of MPC and the
Company.

    (b) Except as noted in the Pilko Environmental Reports and as set forth in
SECTION 2.21 OF THE DISCLOSURE SCHEDULE, (i) neither MPC, the Company, nor any
Subsidiary has received written notice of violation of an Environmental Law with
respect to any of the Assets and Properties of MPC, the Company, or any
Subsidiary, which individually, or in the aggregate with other violations of
Environmental Laws, would materially adversely affect the Business or Condition
of MPC and the Company; (ii) no site or facility now or previously owned,
operated, or leased by MPC, the Company, or any Subsidiary is listed or proposed
for listing on the NPL, CERCLIS or any similar state or local list of sites
requiring investigation or clean-up, or would require remediation or response
under applicable Environmental Laws that would result in expenditures in excess
of $500,000 individually, or $1,000,000 in the aggregate; and (iii) to the
Knowledge of MPC and Seller, no facts, events or conditions relating to the past
or present facilities, properties or operations of MPC, the Company, or any of
the Subsidiaries will prevent continued compliance with Environmental Laws or
can reasonably be expected to give rise to any investigatory, remedial or
corrective obligations pursuant to Environmental Laws, including without
limitation any such liabilities or noncompliance relating to onsite or offsite
releases or threatened releases of hazardous materials, substances or wastes,
which individually or in the aggregate with other such facts, events or
conditions, would materially adversely affect the Business or Condition of MPC
and the Company.

    2.22  INFORMATION SUPPLIED.  The proxy statement relating to the MPC
Stockholders' Meeting (as defined in SECTION 4.11), as amended or supplemented
from time to time (as so amended and supplemented, the "PROXY STATEMENT"), and
any other documents to be filed by MPC with the SEC or any other Governmental or
Regulatory Authority in connection with the Restructuring and the other
transactions contemplated hereby will (in the case of the Proxy Statement and
any such other documents filed with the SEC under the Exchange Act or the
Securities Act) comply as to form in all material respects with the requirements
of the Exchange Act and the Securities Act, respectively, and will not, on the
date of its filing or, in the case of the Proxy Statement, at the date it is
mailed to

                                      B-11
<PAGE>
stockholders of MPC and at the time of the MPC Stockholders' meeting, contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not
misleading.

    2.23  VOTE REQUIRED.  Assuming the accuracy of the representation and
warranty contained in SECTION 3.09, the affirmative vote of the holders of
record of at least two-thirds of the issued and outstanding common stock of MPC
with respect to the adoption of this Agreement and the Restructuring is the only
vote of the holders of any class or series of the capital stock of MPC required
to adopt this Agreement and approve the Restructuring and the other transactions
contemplated hereby.

    2.24  BROKERS.  Except for Goldman, Sachs & Co., whose fees, commissions and
expenses are the sole responsibility of Seller, all negotiations relative to
this Agreement and the transactions contemplated hereby have been carried out by
Seller and MPC directly with Purchaser without the intervention of any Person on
behalf of Seller and MPC in such manner as to give rise to any valid claim by
any Person against Purchaser, MPC, the Company or any Subsidiary for a finder's
fee, brokerage commission or similar payment.

    2.25  PUBLIC UTILITY HOLDING COMPANY ACT.  As of the date of this Agreement,
none of the Subsidiaries is a "public utility company," a "holding company," a
"subsidiary company" or an "affiliate" of any public utility company within the
meaning of SECTION 2(a)(5), 2(a)(8) or 2(a)(11) of the Public Utility Holding
Company Act of 1935, as amended (the "1935 ACT"), respectively. Neither MPC, the
Company nor any Subsidiary is currently regulated under the 1935 Act.

    2.26  REGULATORY FILINGS.  All filings (other than immaterial filings)
required to be made by MPC or any of the Subsidiaries since January 1, 1997
under the 1935 Act, the Federal Power Act, the Federal Communications Act of
1934 and applicable state Laws, have been timely filed with the SEC, the FERC,
the Department of Energy, the FCC or any applicable state public utility
commissions (including, to the extent required, the Montana Public Service
Commission), as the case may be, including all forms, statements, reports,
agreements (oral or written) and all documents, exhibits, amendments and
supplements appertaining thereto, including all rates, tariffs, franchises,
service agreements and related documents and all such filings complied in all
material respects, as of their respective dates, with all applicable
requirements of the applicable statute and the rules and regulations thereunder,
except for filings the failure of which to make, individually or in the
aggregate, have not had and could not reasonably be expected to have a material
adverse effect on the Business or Condition of MPC and the Company.

    2.27  RIGHTS AGREEMENT.  As of the date of this Agreement, MPC, or the Board
of Directors of MPC, as the case may be, has taken all necessary actions so as
to render the Rights Agreement dated March 2, 1999, as amended, inapplicable to
the execution and delivery of this Agreement, the consummation of the
transactions contemplated hereby, the Restructuring, the Divestiture and any
other transactions contemplated hereby.

    2.28  EFFECT OF RESTRUCTURING.  Except as disclosed in Section 2.28 of the
Disclosure Schedule, as a consequence of the Restructuring, as of the Closing
Date, by operation of law pursuant to Section 35-1-817 and 35-8-1203 of the
Montana Code Annotated (1999), the Company will have succeeded to all of MPC's
right, title and interest in the Assets and Properties of MPC and constituting
the utility business of MPC (the "UTILITY BUSINESS"), as described in that
certain Confidential Offering Memorandum dated May 2000 prepared by Goldman,
Sachs & Co., except for Assets or Properties acquired or disposed of in
compliance with this Agreement, including SECTION 4.07.

                                      B-12
<PAGE>
                                  ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF PURCHASER

    Purchaser hereby represents and warrants to Seller and MPC as follows:

    3.01  CORPORATE EXISTENCE.  Purchaser is a corporation duly incorporated,
validly existing and in good standing under the Laws of the state of its
incorporation. Purchaser has full corporate power and authority to execute and
deliver this Agreement, to perform its obligations hereunder and to consummate
the transactions contemplated hereby.

    3.02  AUTHORITY.  The execution and delivery by Purchaser of this Agreement,
and the performance by Purchaser of its obligations hereunder, have been duly
and validly authorized by the Board of Directors of Purchaser, no other
corporate action on the part of Purchaser or its stockholders being necessary.
This Agreement has been duly and validly executed and delivered by Purchaser and
constitutes a legal, valid and binding obligation of Purchaser enforceable
against Purchaser in accordance with its terms.

    3.03  NO CONFLICTS.  The execution and delivery by Purchaser of this
Agreement do not, the performance by Purchaser of its obligations under this
Agreement and the consummation of the transactions contemplated hereby will not:

    (a) conflict with or result in a violation or breach of any of the terms,
conditions or provisions of the certificate of incorporation or by-laws of
Purchaser;

    (b) subject to obtaining the consents, approvals and actions, making the
filings and giving the notices disclosed in SCHEDULE 3.04 hereto, conflict with
or result in a violation or breach of any term or provision of any Law or Order
applicable to Purchaser or any of its Assets and Properties (other than such
conflicts, violations or breaches which could not in the aggregate reasonably be
expected to adversely affect the validity or enforceability of this Agreement);
or

    (c) except as disclosed in SCHEDULE 3.03 hereto or as could not,
individually or in the aggregate, reasonably be expected to adversely affect the
ability of Purchaser to consummate the transactions contemplated hereby or to
perform its obligations hereunder, (i) conflict with or result in a violation or
breach of, (ii) constitute (with or without notice or lapse of time or both) a
default under, (iii) require Purchaser to obtain any consent, approval or action
of, make any filing with or give any notice to any Person as a result or under
the terms of, or (iv) result in the creation or imposition of any Lien upon
Purchaser or any of its Assets or Properties under, any Contract or License to
which Purchaser is a party or by which any of its Assets and Properties is
bound.

    3.04  GOVERNMENTAL APPROVALS AND FILINGS.  Except as disclosed in
SCHEDULE 3.04 hereto, no consent, approval or action of, filing with or notice
to any Governmental or Regulatory Authority on the part of Purchaser is required
in connection with the execution, delivery and performance of this Agreement or
the consummation of the transactions contemplated hereby, except where the
failure to obtain any such consent, approval or action, to make any such filing
or to give any such notice could not reasonably be expected to adversely affect
the ability of Purchaser to consummate the transactions contemplated by this
Agreement or to perform its obligations hereunder.

    3.05  LEGAL PROCEEDINGS.  There are no Actions or Proceedings pending or, to
the knowledge of Purchaser, threatened against, relating to or affecting
Purchaser or any of its Assets and Properties which could reasonably be expected
to result in the issuance of any Order restraining, enjoining or otherwise
prohibiting or making illegal the consummation of any of the transactions
contemplated by this Agreement.

    3.06  PURCHASE FOR INVESTMENT.  The Units will be acquired by Purchaser (or,
if applicable, its assignee pursuant to SECTION 13.09(b)) for its own account
for the purpose of investment, it being understood that the right to dispose of
such Units shall be entirely within the discretion of Purchaser

                                      B-13
<PAGE>
(or such assignee, as the case may be). Purchaser (or such assignee, as the case
may be) will refrain from transferring or otherwise disposing of any of the
Units, or any interest therein, in such manner as to cause Seller to be in
violation of the registration requirements of the Securities Act or applicable
state securities or blue sky laws.

    3.07  BROKERS.  Except for Credit Suisse First Boston, whose fees,
commissions and expenses are the sole responsibility of Purchaser, all
negotiations relative to this Agreement and the transactions contemplated hereby
have been carried out by Purchaser directly with Seller without the intervention
of any Person on behalf of Purchaser in such manner as to give rise to any valid
claim by any Person against Seller, the Company or any Subsidiary for a finder's
fee, brokerage commission or similar payment.

    3.08  FINANCING.  Purchaser has sufficient cash and/or available credit
facilities or written commitments for credit facilities (and has provided Seller
and MPC with evidence thereof) to pay the Purchase Price and to make all other
necessary payments of fees and expenses in connection with the transactions
contemplated by this Agreement.

    3.09  OWNERSHIP OF THE CAPITAL STOCK.  Purchaser does not beneficially own
any of the capital stock of MPC.

    3.10  EXON-FLORIO.  Purchaser is not a "foreign person" for purposes of the
Exon-Florio Amendment.

    3.11  INDEPENDENT EVALUATION.  Purchaser is experienced and knowledgeable in
the utility business, and is aware of its risks. Purchaser has been afforded the
opportunity to examine the materials made available to it by Seller in Seller's
offices in Butte, Montana (the "Data Room") with respect to MPC, the Company,
its Subsidiaries and their business (the "Background Materials"). The Background
Materials include files, or copies thereof, that MPC, the Company and its
Subsidiaries have used in their normal course of business and other information
about MPC, the Company and its Subsidiaries and their business that MPC, the
Company and its Subsidiaries have compiled or generated; however, Purchaser
acknowledges and agrees that neither MPC, the Seller nor the Company, the
Subsidiaries or other Person has made any representations or warranties, express
or implied, written or oral, as to the accuracy or completeness of the
Background Materials or, except for the representations and warranties of Seller
contained in this Agreement, as to any other information relating to MPC, the
Company, the Subsidiaries or their business furnished or to be furnished to
Purchaser or its representatives by or on behalf of Seller. In entering into
this Agreement, Purchaser acknowledges and affirms that it has relied and will
rely solely on the terms of this Agreement and upon its independent analysis,
evaluation and investigation of, and judgment with respect to, the business,
economic, legal, tax or other consequences of this transaction including its own
estimate and appraisal of the extent and value of and the risks associated with
the utility business. Purchaser's representatives have visited the offices of
Seller and have been given opportunities to examine the Books and Records Seller
has made available relating to MPC, the Company, the Subsidiaries and their
business. Except as expressly provided in this Agreement, neither Seller nor
MPC, the Company nor the Subsidiaries shall have any liability to Purchaser or
its Affiliates, agents, representatives or employees resulting from any use,
authorized or unauthorized, by Purchaser or its Affiliates, agents,
representatives or employees of the Background Materials or other information
relating to MPC, the Company, the Subsidiaries or their business provided by or
on behalf of MPC, any Seller, the Company or its Subsidiaries.

                                   ARTICLE IV
                          COVENANTS OF SELLER AND MPC

    Each of Seller and MPC covenants and agrees with Purchaser that, at all
times from and after the date hereof until the Closing, Seller and MPC will
comply with all covenants and provisions of this ARTICLE IV, except to the
extent Purchaser may otherwise consent in writing.

                                      B-14
<PAGE>
    4.01  REGULATORY AND OTHER APPROVALS.  Seller and MPC will, and will cause
the Company and the Subsidiaries to, as promptly as practicable (a) take all
commercially reasonable steps necessary or desirable to obtain all consents,
approvals or actions of, make all filings with and give all notices to
Governmental or Regulatory Authorities or any other Person required of Seller,
MPC, the Company or any Subsidiary to consummate the transactions contemplated
hereby, including without limitation those described in SECTIONS 2.06 AND 2.07
OF THE DISCLOSURE SCHEDULE, (b) provide such other information and
communications to such Governmental or Regulatory Authorities or other Persons
as such Governmental or Regulatory Authorities or other Persons may reasonably
request in connection therewith and (c) provide reasonable cooperation to
Purchaser in connection with the performance of its obligations under SECTIONS
5.01 and 5.02. Seller and MPC will provide prompt notification to Purchaser when
any such consent, approval, action, filing or notice referred to in clause (a)
above is obtained, taken, made or given, as applicable, and will advise
Purchaser of any communications (and, unless precluded by Law, provide copies of
any such communications that are in writing) with any Governmental or Regulatory
Authority or other Person regarding any of the transactions contemplated by this
Agreement.

    4.02  HSR FILINGS.  In addition to and not in limitation of Seller's and
MPC's covenants contained in SECTION 4.01, Seller and MPC will (a) take promptly
all actions necessary to make the filings required of Seller, MPC or their
Affiliates under the HSR Act, (b) comply at the earliest practicable date with
any request for additional information received by Seller, MPC or their
Affiliates from the Federal Trade Commission or the Antitrust Division of the
Department of Justice pursuant to the HSR Act and (c) cooperate with Purchaser
in connection with Purchaser's filing under the HSR Act and in connection with
resolving any investigation or other inquiry concerning the transactions
contemplated by this Agreement commenced by either the Federal Trade Commission
or the Antitrust Division of the Department of Justice or state attorneys
general. In the event that a suit or objection is instituted by any Person
challenging this Agreement and the transactions contemplated hereby as violative
of applicable competition and antitrust laws, each of Purchaser and Seller, MPC
and the Company shall use commercially reasonable efforts to resist or resolve
such suit or objection.

    4.03  INVESTIGATION BY PURCHASER.  Seller and MPC will, and will cause the
Company and the Subsidiaries to, (a) provide Purchaser and its officers,
employees, counsel, accountants, financial advisors, consultants and other
representatives (together, "REPRESENTATIVES") with full access, upon reasonable
prior notice and during normal business hours, to all officers, employees,
agents and accountants of MPC, the Company and the Subsidiaries and their Assets
and Properties and Books and Records, but only to the extent that such access
does not unreasonably interfere with the business and operations of MPC, the
Company and the Subsidiaries, and (b) furnish Purchaser and such other Persons
with all such information and data (including without limitation copies of
Contracts, Benefit Plans and other Books and Records) concerning the business
and operations of MPC, the Company and the Subsidiaries as Purchaser or any of
such other Persons reasonably may request in connection with such investigation
(and permit the copying thereof), except to the extent that furnishing any such
information or data would violate any Law, Order, Contract or License applicable
to Seller, MPC, the Company or any Subsidiary or by which any of their
respective Assets and Properties is bound.

    4.04  NO SOLICITATIONS.  Seller and MPC will not take, nor will they permit
the Company, the Subsidiaries or any Affiliate of Seller or MPC (or authorize or
permit any investment banker, financial advisor, attorney, accountant or other
Person retained by or acting for or on behalf of Seller, MPC, the Company, the
Subsidiaries or any such Affiliate) to take, directly or indirectly, any action
to solicit, encourage, receive, negotiate, assist or otherwise facilitate
(including by furnishing confidential information with respect to MPC, the
Company or any Subsidiary or permitting access to the Assets and Properties and
Books and Records of MPC, the Company or any Subsidiary) or accept any offer or
inquiry from any Person concerning an Acquisition Proposal. Notwithstanding the
foregoing, MPC or its Board of Directors shall be permitted to (A) to the extent
applicable, comply with Rule 14e-2(a)

                                      B-15
<PAGE>
promulgated under the Exchange Act with regard to an Acquisition Proposal, or
(B) engage in any discussions or negotiations with, or provide any information
to any Person in response to an unsolicited bona fide written Acquisition
Proposal, by any such Person, if and only to the extent that, in the case of the
actions referred to in clause (B), (i) the MPC Stockholders' Meeting shall not
have occurred, (ii) the Board of Directors of MPC, concludes in good faith after
consultation with its financial advisors and legal advisors, that such
Acquisition Proposal would reasonably be expected to constitute a Superior
Proposal, (iii) prior to providing any information or data to any Person in
connection with an Acquisition Proposal by any such Person, the Board of
Directors of MPC receives from such Person an executed confidentiality agreement
on terms no less favorable to the Company than those contained in the
Confidentiality Agreement between MPC and Purchaser regarding the sale of the
Utility Business and (iv) prior to providing any information or data to any
Person or entering into discussions or negotiations with any Person, the Board
of Directors of MPC notifies Purchaser immediately of such inquiries, proposals
or offers received by, any such information requested from, or any such
discussions or negotiations sought to be initiated or continued with, any of its
representatives indicating, in connection with such notice, the name of such
Person and the material terms and conditions of any proposals or offers. Seller
and MPC agree immediately to cease and cause to be terminated any existing
activities, discussions, or negotiations with any parties heretofore conducted
with respect to any Acquisition Proposal. Seller and MPC agree to take the
necessary steps promptly to inform all such Persons of its obligations
hereunder. Nothing in this Section 4.04 shall (x) permit Seller or MPC to
terminate this Agreement (except as specifically provided in Article XI), or
(y) affect any other obligation of Seller or MPC under this Agreement.

    4.05  CONDUCT OF BUSINESS.  MPC will, and will cause the Company and the
Subsidiaries to, conduct business only in the ordinary course consistent with
past practice and in compliance with applicable Law and will timely seek renewal
of all Licenses and permits required or necessary for the operation of the
Utility Business. Without limiting the generality of the foregoing, and other
than with respect to, and in connection with, the Restructuring and the
Divestiture, MPC will, and will cause the Company and the Subsidiaries to, use
commercially reasonable efforts, to the extent the officers of MPC believe such
action to be in the best interests of MPC and the Subsidiaries, to (a) preserve
intact the present business organization, reputation and franchises of MPC, the
Company and the Subsidiaries in all material respects, (b) keep available
(subject to dismissals and retirements (including retirements pursuant to MPC's
"Special Retirement Program") in the ordinary course of business and consistent
with past practice and transfers to any Affiliate of MPC) the services of the
key officers and employees of MPC and the Subsidiaries, (c) maintain the Assets
and Properties of MPC, the Company and the Subsidiaries in good working order
and condition, ordinary wear and tear excepted, and (d) maintain the good will
of key customers, suppliers and lenders and other Persons with whom MPC or any
Subsidiary otherwise has significant business relationships.

    4.06  FINANCIAL STATEMENTS AND REPORTS.  (a) As promptly as practicable and
in any event no later than forty five (45) days after the end of each fiscal
quarter ending after the date hereof and before the Closing Date (other than the
fourth quarter) or ninety (90) days after the end of each fiscal year ending
after the date hereof and before the Closing Date, as the case may be, MPC will
deliver to Purchaser true and complete copies of the unaudited consolidated
balance sheet and the related unaudited consolidated statement of operations of
MPC and the Subsidiaries, in each case as of and for the fiscal year then ended
or as of and for each such fiscal quarter and the portion of the fiscal year
then ended, as the case may be, together with the notes, if any, relating
thereto, which financial statements shall be prepared on a basis consistent with
the Financial Statements.

    (b) As promptly as practicable, MPC will deliver to Purchaser true and
complete copies of such other regularly-prepared financial statements, reports
and analyses as may be prepared or received by MPC, the Company or any
Subsidiary relating to the business or operations of MPC, the Company or any
Subsidiary.

                                      B-16
<PAGE>
    4.07  CERTAIN RESTRICTIONS.  MPC will, and will cause the Subsidiaries to
refrain from:

    (a) except as disclosed in SECTION 4.07(a) OF THE DISCLOSURE SCHEDULE, and
except as may be necessary or desirable in connection with the Restructuring,
amending their certificates or articles of incorporation or by-laws (or other
comparable corporate charter documents) in any material respect or taking any
action with respect to any such amendment or any recapitalization,
reorganization, liquidation or dissolution of any such corporation;

    (b) except as disclosed in SECTION 4.07(b) OF THE DISCLOSURE SCHEDULE, and
except as may be necessary or desirable in connection with the Restructuring,
authorizing, issuing, selling or otherwise disposing of any shares of capital
stock of or any Option with respect to MPC, the Company or any Subsidiary, or
modifying or amending any right of any holder of outstanding shares of capital
stock of or Option with respect to MPC, the Company or any Subsidiary;

    (c) except for (i) the declaration of regular quarterly cash dividends on
the MPC common stock not to exceed twenty (20) cents per share, and (ii) the
payment of dividends required to be paid in respect of MPC outstanding preferred
stock, declaring, setting aside or paying any dividend or other distribution in
respect of the capital stock of MPC, the Company or any Subsidiary or directly
or indirectly redeeming, purchasing or otherwise acquiring any capital stock of
or any Option with respect to MPC, the Company or any Subsidiary;

    (d) except as disclosed in SECTION 4.07(d) OF THE DISCLOSURE SCHEDULE and as
specified in the Budget, acquiring or disposing of, or incurring any Lien (other
than a Permitted Lien) on, any Assets and Properties individually or in the
aggregate material to the Business or Condition of MPC and the Company;

    (e) except (i) as disclosed in SECTION 4.07(e) OF THE DISCLOSURE SCHEDULE,
and (ii) in the ordinary course of business consistent with past practices, the
Budget and the terms and provisions of this Agreement, entering into, or in any
material respect amending, modifying, terminating (partially or completely),
granting any waiver under or giving any consent with respect to any Contract to
which MPC, the Company or any Subsidiary is a party which is material to the
Business or Condition of MPC and the Company;

    (f) other than as specified in the Budget, (i) voluntarily incurring
Indebtedness in an aggregate principal amount exceeding $5,000,000 (other than
refinancings where the principal amount refinanced is no greater than the amount
repaid), or (ii) purchasing, canceling, prepaying or otherwise providing for a
complete or partial discharge in advance of a scheduled payment date with
respect to, or waiving any right under, any Indebtedness in an aggregate
principal amount exceeding $1,000,000 (in either case other than Indebtedness of
MPC, the Company or a Subsidiary owing to MPC, the Company or a wholly-owned
Subsidiary); PROVIDED, HOWEVER, that MPC, Seller, the Company and the
Subsidiaries may take any and all actions necessary or appropriate to terminate
the Employee Stock Ownership Plan portion of the MPC 401(k) Plan, and to prepay
any outstanding Indebtedness of MPC, the Company and the Subsidiaries
attributable to such Employee Stock Ownership Plan;

    (g) other than in connection with the Restructuring, engaging with any
Person in any merger or other business combination;

    (h) except as set forth in the Budget, making (1) capital expenditures or
commitments for additions to property, plant or equipment constituting capital
assets or (2) making expenditures with respect to operations and maintenance or
incurring general and administrative expenses, in each case in an aggregate
amount exceeding $1,000,000;

                                      B-17
<PAGE>
    (i) except to the extent required by applicable Law or reasonably and in
good faith believed by the officers of MPC or the Company to be in the best
interests of MPC, the Company and the Subsidiaries (and subject in each case to
prior written notice to, and consultation with, Purchaser), making any material
change in (A) any pricing, investment, accounting, financial reporting,
inventory, credit, allowance or Tax practice or policy, or (B) any method of
calculating any bad debt, contingency or other reserve for accounting, financial
reporting or Tax purposes;

    (j) other than in the ordinary course of business or to the extent required
by applicable Law (including without limitation, the duty to bargain in good
faith under any collective bargaining agreement) (and subject in each case to
prior written notice to, and consultation with, Purchaser), adopting, entering
into or becoming bound by any material Benefit Plan, employment-related Contract
or collective bargaining agreement, or amending, modifying or terminating
(partially or completely) any such Benefit Plan (other than the Employee Stock
Ownership Plan portion of the MPC 401(k) Plan), employment-related Contract or
collective bargaining agreement if such action will result in material
additional cost to MPC;

    (k) making any change in its fiscal year;

    (l) except as set forth in the Budget, making any loans or advances by it
to, or guarantee, endorse or otherwise be or become contingently liable,
directly or indirectly, in connection with the obligations, stocks or dividends
of, or owning, purchasing or acquiring stock, obligations or securities of, or
any other interest in, or make any capital contributions to, any Person;

    (m) effectuating a "plant closing" or "mass layoff", as those terms are
defined in the Worker Adjustment and Retraining Act, affecting in whole or in
part any site of employment, facility, operating unit or employee of MPC, the
Company or any Subsidiary;

    (n) paying, discharging or satisfying any claims, liabilities or obligations
(obsolete, accrued, asserted or unasserted, contingent or otherwise), other than
the payment, discharge or satisfaction in the ordinary course of business and
consistent with past practice of liabilities reflected or reserved against in
the balance sheet comprising the Interim Financial Statements;

    (o) making or changing any Tax election, filing any amended Tax Return,
settling or compromising any federal, state, local or foreign Tax liability,
changing any annual Tax accounting period, changing any method of Tax
accounting, entering into any closing agreement relating to any Tax,
surrendering any right to claim a Tax refund, or consenting to any extension or
waiver of the limitations period applicable to any Tax claim or assessment, in
each case in a manner which could reasonably be expected to have material
adverse effect on Purchaser, the Company or the Subsidiaries for any post
Closing period; or

    (p) selling any cushion gas other than sales in accordance with prudent
utility practices, the proceeds of which will remain with, or be used for the
benefit of, MPC; or

    (q) entering into any Contract to do or engage in any of the foregoing.

    Notwithstanding any provision to the contrary, nothing in this SECTION 4.07
or SECTION 4.05 shall require MPC, Seller or the Company to revise, dishonor or
delay performance of any obligation under agreements in existence prior to the
date hereof.

    4.08  AFFILIATE TRANSACTIONS.  Except as disclosed in SECTION 4.08 OF THE
DISCLOSURE SCHEDULE, immediately prior to the Closing, all Indebtedness and
other amounts owing under Contracts between Seller, any officer, director or
Affiliate (other than MPC, the Company or any Subsidiary) of Seller, on the one
hand, and MPC, the Company or any of the Subsidiaries, on the other (each an
"AFFILIATE CONTRACT"), including the policy among the members of the MPC
Affiliated Group as described in SECTION 2.10(d) OF THE DISCLOSURE SCHEDULE,
will be paid in full. With respect to any Affiliate Contract disclosed in
SECTION 4.08 OF THE DISCLOSURE SCHEDULE or entered into after the date hereof,
which provides

                                      B-18
<PAGE>
for the provision of services to MPC, the Company or any Subsidiary, Seller and
MPC will, at Purchaser's election prior to the Closing Date, either
(i) terminate such Contract or cause it to be terminated, effective as of the
Closing Date, or (ii) cause such Contract to provide, effective as of the
Closing Date, that the same is terminable at the option of MPC, the Company or
the Subsidiary, as applicable, upon not more than 30 days prior notice or such
shorter period as may be provided for under the existing provisions of such
Contract.

    4.09  FULFILLMENT OF CONDITIONS.  Seller and MPC will take all commercially
reasonable steps necessary or desirable and proceed diligently and in good faith
to satisfy each condition to the obligations of Purchaser contained in this
Agreement and will not, and will not permit the Company or any Subsidiary to,
take or fail to take any action that could reasonably be expected to result in
the nonfulfillment of any such condition.

    4.10  COMPLETION OF RESTRUCTURING.  Seller and MPC will use their best
efforts to cause the Restructuring to become effective prior to the Closing.

    4.11  PREPARATION AND MAILING OF PROXY STATEMENT.  As soon as practicable
after the date of this Agreement, MPC shall prepare and mail the Proxy Statement
to the holders of MPC capital stock entitled to vote at the meeting of the
stockholders of MPC to be called by MPC for the purpose of obtaining the MPC
Stockholders Approval (the "MPC STOCKHOLDERS' MEETING") at the earliest
practicable time following the date hereof.

    4.12  APPROVAL OF MPC STOCKHOLDERS.  MPC shall, through its Board of
Directors, duly call, give notice of, convene and hold the MPC Stockholders
Meeting for the purpose of voting on the approval and adoption of this Agreement
and the Restructuring (the "MPC STOCKHOLDERS' APPROVAL") as soon as reasonably
practicable after the date hereof. Subject to the following sentence MPC shall,
through its Board of Directors, include in the Proxy Statement the
recommendation of the Board of Directors of MPC that the stockholders of MPC
approve and adopt this Agreement and the Restructuring, and shall use its best
efforts to obtain such approval and adoption. The Board of Directors of MPC
shall not withdraw, amend or modify in a manner adverse to Purchaser its
recommendation referred to in the preceding sentence (or announce publicly its
intention to do so), except that such Board of Directors shall be permitted to
withdraw, amend or modify its recommendation (or publicly announce its intention
to do so) if: (i) Seller and MPC have complied with SECTION 4.04; (ii) an
unsolicited Superior Proposal shall have been proposed by any Person other than
Purchaser and such proposal is pending at the time of such withdrawal, amendment
or modification; and (iii) MPC shall have notified Purchaser in writing of such
Superior Proposal at least three (3) Business Days in advance of such
withdrawal, amendment or modification.

    4.13  COMPLETION OF THE DIVESTITURE.  Seller and MPC will use their
commercially reasonable efforts to cause the Divestiture to be completed prior
to the Closing.

    4.14  REGULATORY PROCEEDINGS.  Seller, MPC and the Company will take
commercially reasonable steps to enable Purchaser to participate as a party in
interest in all current and future FERC proceedings and PSC proceedings,
including but not limited to, stranded costs, default supplier rules, regional
transmission organizations and electric and gas rate increase requests. In the
event that applicable rules will not allow Purchaser to so participate in such
proceedings, Seller, MPC and the Company agree to furnish Purchaser with all
documentation filed in connection therewith and to consult and cooperate with
Purchaser on an ongoing basis regarding the conduct thereof.

    4.15  SALE OF COLSTRIP 1, 2, AND 3 TRANSMISSION SYSTEM.  Seller and MPC will
use their commercially reasonable efforts to consummate the sale of the interest
in the Colstrip 1, 2, and 3 Transmission System to PPL Montana LLC for the
agreed consideration of $97 million cash and the proceeds of which will remain
with, or be used for the benefit of, MPC.

                                      B-19
<PAGE>
    4.16  QF CONTRACTS.  Seller and MPC agree to advise, consult and cooperate
with Purchaser regarding all negotiations for the buyout or buydown of QF
contracts and promptly furnish copies to Purchaser of all new letters of intent
and definitive agreement for the buyout or buydown of QF contracts.

    4.17  MPC BENEFIT RESTORATION PLANS.  Seller and MPC agree that, from and
after the date of this Agreement, Seller and MPC will not allow any new
participant in the MPC Benefit Restoration Plan for Senior Executives or the MPC
Benefit Restoration Plan for Directors nor amend or modify the terms of such
plans other than to transfer participants or obligations out of such plans to
Seller or its Affiliates in a manner that results in no liability to Purchaser.

    4.18  POWER SUPPLY.  Seller and MPC agree to advise, consult and cooperate
with Purchaser regarding steps to be taken to manage power supply risks,
including (i) securing power to replace that currently supplied under the
wholesale buyback agreement with PPL Montana LLC that expires on June 30, 2001,
(ii) supplying MPC's residual customer load in full in the event the PSC
proceeding on default supplier rules is not resolved by June 30, 2001, or if
MPC's default supplier role is extended beyond July 1, 2002, and (iii) securing
power to serve MPC's power supply obligations to Advanced Silicon
Materials, Inc. Seller and MPC agree to take reasonable and prudent steps to
mitigate such risk, including contracting for additional power supply, and to
consult and cooperate with Purchaser in the taking of such steps.

    4.19  GENERATION SALE PROCEEDS.  Seller and MPC agree to maintain the net
after tax cash proceeds from the sale of generation and related assets to PPL
Montana LLC, after reduction for unrecovered regulatory assets, as cash reserves
(which as of the date hereof, shall not be less than $55,000,000) and not to
apply the same except as mandated by the PSC or FERC final order (or if such
order is appealed by the final non-appealable order of the applicable court with
jurisdiction over such appeal) on stranded cost recovery or as otherwise
consented to by Purchaser.

    4.20  REGIONAL TRANSMISSION ORGANIZATION AND INDEPENDENT TRANSMISSION
COMPANY.  Seller and MPC agree to advise, consult and cooperate with Purchaser
regarding all negotiations and agreements for the potential inclusion of MPC or
the Company in any Independent Transmission Company or Regional Transmission
Company or Regional Transmission Organization. Seller and MPC agree to promptly
furnish Purchaser copies of all agreements regarding the Independent
Transmission Company or Regional Transmission Organization.

    4.21  NOTIFICATION OF CERTAIN MATTERS.  Seller and MPC shall give prompt
notice to Purchaser, and Purchaser shall give prompt notice to Seller and MPC,
of (i) the occurrence or non-occurrence of any event the occurrence or
non-occurrence of which would be likely to cause any representation or warranty
contained in this Agreement to be untrue or inaccurate and (ii) any failure of
Seller, MPC, the Company, or any Subsidiary or Purchaser, as the case may be, to
comply with or satisfy any covenant, condition or agreement to be completed with
or satisfied by it hereunder; PROVIDED, HOWEVER, that the delivery of any notice
pursuant to this SECTION 4.21 shall not limit or otherwise affect the remedies
available hereunder to the party entitled to receive such notice.

    4.22  CONFIDENTIALITY AND STANDSTILL AGREEMENTS.  From the date hereof to
the Closing Date, neither Seller, MPC, nor the Company shall terminate, amend,
modify or waive any provisions of any confidentiality or standstill agreement
relating to the Utility Business to which it is a party or by which it is bound.
During such period, Seller, MPC and the Company each shall enforce, to the
fullest extent permitted under applicable law, the provisions of any such
agreement, including but not limited to, by obtaining injunctive relief to
prevent any breaches of such agreements and to enforce specifically the terms
and provisions thereof in any court having jurisdiction.

                                      B-20
<PAGE>
                                   ARTICLE V
                             COVENANTS OF PURCHASER

    Purchaser covenants and agrees with Seller and MPC that, at all times from
and after the date hereof until the Closing and, in the case of SECTION 5.04 and
SECTION 5.07, thereafter, Purchaser will comply with all covenants and
provisions of this ARTICLE V, except to the extent Seller and MPC may otherwise
consent in writing.

    5.01  REGULATORY AND OTHER APPROVALS.  Purchaser will as promptly as
practicable (a) take all commercially reasonable steps necessary or desirable to
obtain all consents, approvals or actions of, make all filings with and give all
notices to Governmental or Regulatory Authorities or any other Person required
of Purchaser to consummate the transactions contemplated hereby, including
without limitation those disclosed in SCHEDULES 3.03 and 3.04 hereto, and those
that may be required in connection with the transaction structure contemplated
by SECTION 5.08, (b) provide such other information and communications to such
Governmental or Regulatory Authorities or other Persons as such Governmental or
Regulatory Authorities or other Persons may reasonably request in connection
therewith and (c) provide reasonable cooperation to Seller, the Company and the
Subsidiaries in connection with the performance of their obligations under
SECTIONS 4.01 and 4.02. Purchaser will provide prompt notification to Seller
when any such consent, approval, action, filing or notice referred to in
clause (a) above is obtained, taken, made or given, as applicable, and will
advise Seller of any communications (and, unless precluded by Law, provide
copies of any such communications that are in writing) with any Governmental or
Regulatory Authority or other Person regarding any of the transactions
contemplated by this Agreement.

    5.02  HSR.  In addition to and without limiting Purchaser's covenants
contained in SECTION 5.01, Purchaser will (i) take promptly all actions
necessary to make the filings required of Purchaser or its Affiliates under the
HSR Act, (ii) comply at the earliest practicable date with any request for
additional information received by Purchaser or its Affiliates from the Federal
Trade Commission or the Antitrust Division of the Department of Justice pursuant
to the HSR Act and (iii) cooperate with Seller in connection with Seller's
filing under the HSR Act and in connection with resolving any investigation or
other inquiry concerning the transactions contemplated by this Agreement
commenced by either the Federal Trade Commission or the Antitrust Division of
the Department of Justice or state attorneys general.

    5.03  [INTENTIONALLY OMITTED.]

    5.04  EMPLOYEE MATTERS.

    (a)  CONTINUATION OF COMPENSATION AND BENEFITS.  Except as otherwise
provided in this SECTION 5.04, during the period from the Closing Date until
twenty-four months following the Closing Date, the Purchaser will maintain, or
shall cause the Company and the Subsidiaries to maintain, base salary, wages,
compensation levels (including, without limitation, incentive compensation or
comparable cash equivalent plan) and employee pension and welfare benefit plans
and programs for the benefit of the employees of MPC, the Company and the
Subsidiaries, which, in the aggregate, are at least equal to, or equivalent in
value to, the base salary, wages, compensation levels, and Benefit Plans listed
in SECTION 2.13(a) OF THE DISCLOSURE SCHEDULE provided to the employees of MPC,
the Company and the Subsidiaries on the date of this Agreement, plus any base
salary and wage adjustments made in the ordinary course of business between the
date of this Agreement and the Closing Date.

    (b)  SERVICE CREDIT.  The Purchaser shall provide, or shall cause the
Company and the Subsidiaries to provide, each employee of MPC, the Company and
the Subsidiaries with credit for all service with MPC, the Company and the
Subsidiaries for all purposes under each employee benefit plan, program, or
arrangement of the Purchaser or its Affiliates in which such employee is
eligible to participate,

                                      B-21
<PAGE>
except to the extent that such service credit would result in a duplication of
benefits with respect to the same period of service.

    (c)  BONUSES; INCENTIVE COMPENSATION.  The Purchaser shall maintain, or
shall cause the Company and the Subsidiaries to maintain, the bonus plans and
other incentive compensation plans and programs maintained by Seller and/or any
of its Affiliates or comparable cash equivalent plans in which the employees of
MPC, the Company and the Subsidiaries are eligible to participate (including
terminated or retired employees) who remain eligible to participate under the
terms of such plans, as in effect on the date of this Agreement, through the end
of the calendar year in which the Closing Date occurs, with the bonuses and
incentive compensation to be paid thereunder by Purchaser and/or its Affiliates
determined (i) in accordance with calculation methods directed by Seller, such
methods to be consistent with the terms of such incentive compensation plans in
effect on the date of this Agreement and MPC's, the Company's and the
Subsidiaries' past practices, as appropriate, and (ii) in such a manner so that
the effects of the transaction contemplated by this Agreement will not unduly
burden or benefit the employees of MPC, the Company and the Subsidiaries.

    (d)  SEVERANCE POLICY; OTHER AGREEMENTS.  Except as disclosed in
SECTION 5.04(d) OF THE DISCLOSURE SCHEDULE, if the employment of any employee of
the Company or a Subsidiary, is terminated within twenty-four months after the
Closing Date by (i) action of the Purchaser or any of its Affiliates other than
for Cause or (ii) action of an employee following (A) a reduction in such
employee's base salary equal to or greater than fifteen percent (15%) or
(B) such employee's decision not to relocate more than fifty (50) miles from his
or her then current job location, then Purchaser shall pay, or shall cause the
Company or the affected Subsidiary to pay, each such employee a lump sum
severance benefit (less required tax withholding and other withholding
obligations required by Law) in an amount equal to the sum of (x) ten percent
(10%) of such employee's base salary multiplied by such employee's "years of
service" up to a maximum of one hundred percent (100%) of such base salary, plus
(y) six thousand dollars ($6,000). For purposes of the foregoing, "years of
service" shall mean the employee's aggregate total years of service (pro-rated
to the date of termination) with MPC, the Purchaser and any of their respective
Affiliates. Notwithstanding the foregoing, for those employees disclosed in
SECTION 5.04(d) OF THE DISCLOSURE SCHEDULE who are parties to an individual
change in control severance agreement with MPC, the terms of such agreement
shall apply with respect to any termination of such employee, and the
consummation of the transaction contemplated by this Agreement will be deemed to
constitute a "Change in Control" for purposes of each such agreement. The
Purchaser shall honor, or shall cause the Company and the Subsidiaries to honor,
all such individual change in control severance agreements with such employees,
and the Purchaser shall be liable for any amount(s) or benefit(s) due
thereunder.

    (e)  BENEFIT PLAN OBLIGATIONS.  The Purchaser shall be, or shall cause the
Company and the Subsidiaries to be, responsible for all obligations existing on
the Closing Date (including, without limitation, any such obligations that have
been incurred but not yet paid) under any Benefit Plan (including, without
limitation, all health and welfare, life insurance and disability plans and
programs) applicable to the employees and former employees of MPC, the Company
and the Subsidiaries and to certain former employees of Affiliates of MPC, as
disclosed in SECTION 5.04(e) OF THE DISCLOSURE SCHEDULE (collectively, the
"COVERED PARTICIPANTS") and their covered dependents. Effective as of the
Closing Date, Seller and its Affiliates (other than MPC, the Company or any
Subsidiary) shall have no liability or responsibility for any obligation under
any Benefit Plan applicable to the Covered Participants and their covered
dependents with respect to claims incurred by the Covered Participants or their
covered dependents prior to the Closing Date under each Benefit Plan. Expenses
and benefits with respect to claims incurred by the Covered Participants or
their covered dependents on or after the Closing Date shall be the
responsibility of Purchaser. For purposes of this paragraph, a claim is deemed
incurred when the services that are the subject of the claim are performed; in
the case of life insurance, when the death occurs, and, in the case of
short-term or long-term disability benefits, when the disability occurs. The
Purchaser shall, or shall cause the Company and the Subsidiaries to (i) waive
all limitations

                                      B-22
<PAGE>
as to preexisting conditions, exclusions and waiting periods with respect to
participation and coverage requirements applicable to the Covered Participants
and their covered dependents under any Benefit Plan, in which such Covered
Participants and their covered dependents may be eligible to participate after
the Closing Date and (ii) provide each Covered Participant and their covered
dependents with credit for any co-payments and deductibles paid prior to the
Closing Date in satisfying any applicable deductible or out-of-pocket
requirements under any Benefit Plan in which such Covered Participants and their
covered dependents are eligible to participate after the Closing Date.

    (f)  MPC 401(k) PLAN.  Effective as of the Closing Date, Purchaser shall
sponsor and maintain, or shall cause the Company to sponsor and maintain, the
MPC 401(k) Plan, or a comparable Qualified Plan (with the employer contribution
being made in cash not shares), for the eligible participants and beneficiaries
(including continuing the Seller stock investment fund for the exclusive benefit
of the eligible participants and beneficiaries who had balances in such fund on
the Closing Date) for at least twenty-four months after the Closing Date.
Effective as of the Closing Date, employees of the Seller and its Affiliates
(other than MPC, the Company and the Subsidiaries) shall cease to accrue
benefits and service credits under the MPC 401(k) Plan. To the extent Purchaser
sponsors or maintains a comparable plan rather than the MPC 401(k) Plan, such
comparable plan shall provide for the acceptance of a trust to trust transfer
and rollover distributions from MPC Qualified Plans and/or conduit individual
retirement accounts established by such participants and beneficiaries.

    (g)  MPC PENSION PLAN.  Effective as of the Closing Date, Purchaser shall
sponsor and maintain, or shall cause the Company to sponsor and maintain, the
Montana Power Company Pension Plan (the "MPC PENSION PLAN"), or a comparable
plan, for eligible participants and beneficiaries for at least twenty-four
months after the Closing Date. Effective as of the Closing Date, employees of
the Seller and its Affiliates (other than MPC, the Company and the Subsidiaries)
shall cease to accrue benefits under the MPC Pension Plan.

    (h)  SUPPLEMENTAL RETIREMENT PLANS.  Except as disclosed in SECTION 5.04(h)
OF THE DISCLOSURE SCHEDULE, effective as of the Closing Date the Purchaser shall
maintain and shall be responsible for, or shall cause the Company and the
Subsidiaries to maintain and be responsible for, all current and future
obligations of MPC, the Company and the Subsidiaries under any supplemental
pension benefit or benefit replacement or restoration plan, program or
individual arrangement maintained by MPC, the Company and the Subsidiaries as in
effect on the Closing Date.

    (i)  STOCK OPTION OBLIGATION.  On the Closing Date, each unvested stock
option on MPC common stock issued under any plan or program of MPC or its
Affiliates under which the employees of MPC, the Company and the Subsidiaries
have previously been awarded stock options on MPC common stock (an "MPC STOCK
OPTION") shall be cancelled, and the holder thereof shall be entitled to receive
on the Closing Date or as soon as practicable thereafter, from the Purchaser as
consideration for such cancellation, either (i) stock options of substantially
equivalent value ("SUBSTITUTE STOCK OPTIONS") to such holder's MPC Stock Options
(with Seller reserving reasonable discretion to determine whether such
Substitute Stock Options are of "substantially equivalent value"), or (ii) an
amount in cash (less required tax withholding and other withholding obligations
required by Law) equal to the product of (x) the number of shares previously
subject to such MPC Stock Option and (y) the excess, if any, of the market price
per share (the average of the high and low prices of the underlying MPC common
stock as reported on the New York Stock Exchange Composite Tape on the Closing
Date) over the exercise price per share of the cancelled MPC Stock Option;
PROVIDED, HOWEVER, that if the Purchaser provides Substitute Stock Options in
accordance with (i) of this paragraph, then the Purchaser shall pay, or shall
cause the Company or the Subsidiaries to pay, in cash to any employee of MPC,
the Company and the Subsidiaries who receives Substitute Stock Options, but
whose employment terminates before such Substitute Stock Options vest under
circumstances that would entitle the employee to the benefit described in
SECTION 5.04(d), the amount computed under (ii) above as of the Closing Date.

                                      B-23
<PAGE>
    (j)  RETIREE BENEFITS.  Except as disclosed in SECTION 5.04(j) OF THE
DISCLOSURE SCHEDULE, effective as of the Closing Date, the Purchaser shall
maintain and shall be responsible for, or shall cause the Company and the
Subsidiaries to maintain and be responsible for, all current and future
obligations of MPC, the Company and the Subsidiaries with respect to (i) any
post-retirement health or welfare benefit plan, program or arrangement
maintained by MPC, the Company and the Subsidiaries as in effect on the Closing
Date and (ii) the utility discount provided to certain retired employees and
certain other employees, as disclosed in SECTION 5.04(j) OF THE DISCLOSURE
SCHEDULE, of MPC, the Company and the Subsidiaries. The post retirement health
and welfare benefits described in (i) above shall be continued for their full
terms as provided in the applicable plan, program or arrangement as in effect on
the Closing Date, and the utility discount described in (ii) above shall be
continued at least until residential customer choice for electric and natural
gas utility service is fully implemented in Montana.

    (k)  COLLECTIVE BARGAINING AGREEMENTS.  The wages, compensation levels and
employee pension and welfare benefit plans and programs for the benefit of
employees of MPC, the Company and the Subsidiaries who are covered by a
collective bargaining agreement shall be governed by the terms of such
collective bargaining agreement, except (i) to the extent that an employee is
eligible for the benefits provided under SECTION 5.04(c) and/or
SECTION 5.04(d)and (ii) SECTION 5.04(b) shall apply with respect to all such
employees. To the extent that the terms or provisions of any such collective
bargaining agreement conflict with any of the terms or provisions of this
Agreement, the terms or provisions of the collective bargaining agreement shall
govern.

    (l)  CONTINUING OBLIGATION.  If the Purchaser sells or otherwise disposes of
all or substantially all of the stock or assets of the Company within
twenty-four months of the Closing Date, or such other longer time period as may
be applicable to any individual change in control severance agreement, the
Purchaser shall, in connection with such disposition cause the transferee of
such stock or assets to honor the provisions of this SECTION 5.04 until
twenty-four months after the Closing Date, or such other longer time period as
may be applicable under any individual change in control severance agreement.

    5.05  FULFILLMENT OF CONDITIONS.  Purchaser will take all commercially
reasonable steps necessary or desirable and proceed diligently and in good faith
to satisfy each condition to the obligations of Seller contained in this
Agreement and will not take or fail to take any action that could reasonably be
expected to result in the nonfulfillment of any such condition.

    5.06  COMMUNICATION BETWEEN THE PARTIES.  If Purchaser develops information
prior to the Closing Date that leads Purchaser to believe that Seller has
breached a representation or warranty under this Agreement, Purchaser shall
inform Seller of such potential breach as soon as possible, but in any event, at
or prior to Closing.

    5.07  CHARITABLE CONTRIBUTIONS.  During the period from the Closing Date
until twenty-four months following the Closing Date, Purchaser shall, or shall
cause the Company and the Subsidiaries to, continue to provide charitable
contributions or other financial support for non-profit organizations and
educational institutions as disclosed in SECTION 5.07 OF THE DISCLOSURE
SCHEDULE, in amounts substantially comparable to MPC's past practices as set
forth in SECTION 5.07 OF THE DISCLOSURE SCHEDULE taking into account the
Restructuring and the Divestiture.

    5.08  TRANSACTION STRUCTURE.  Purchaser may determine, in its discretion, to
obtain the approval of the SEC under the 1935 Act, or to make the requisite
filing within the SEC under Rule 2 of the 1935 Act, to consummate the
transactions contemplated by this Agreement pursuant to an exempt holding
company structure under the 1935 Act.

                                      B-24
<PAGE>
                                   ARTICLE VI
                     CONDITIONS TO OBLIGATIONS OF PURCHASER

    The obligations of Purchaser hereunder to purchase the Units are subject to
the fulfillment, at or before the Closing, of each of the following conditions
(all or any of which may be waived in whole or in part by Purchaser in its sole
discretion):

    6.01  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
made by Seller and MPC in this Agreement shall be true and correct on and as of
the Closing Date as though made on and as of the Closing Date or, in the case of
representations and warranties made as of a specified date earlier than the
Closing Date, on and as of such earlier date; except for such failures of
representations and warranties to be true and correct (without regard to any
materiality qualifier therein) that, individually or in the aggregate, could not
result in a material adverse effect to the Business or Condition of MPC and the
Company.

    6.02  PERFORMANCE.  Seller and MPC shall have performed and complied with,
in all material respects, the agreements, covenants and obligations required by
this Agreement to be so performed or complied with by Seller and MPC at or
before the Closing.

    6.03  OFFICERS' CERTIFICATES.  Seller shall have delivered to Purchaser a
certificate, dated the Closing Date and executed in the name and on behalf of
Seller by the Chairman of the Board, the President or any Executive or Senior
Vice President of Seller, substantially in the form and to the effect of
EXHIBIT A hereto, and a certificate, dated the Closing Date and executed by the
Secretary or any Assistant Secretary of Seller, substantially in the form and to
the effect of EXHIBIT B hereto.

    6.04  ORDERS AND LAWS.  There shall not be in effect on the Closing Date any
Order or Law restraining, enjoining or otherwise prohibiting or making illegal
the consummation of any of the transactions contemplated by this Agreement.

    6.05  REGULATORY CONSENTS AND APPROVALS.  All consents, approvals and
actions of, filings with and notices to any Governmental or Regulatory Authority
set forth in SCHEDULES 3.03 and 3.04 necessary to permit Purchaser and Seller to
perform their obligations under this Agreement and to consummate the
transactions contemplated hereby, other than those referred to in SECTION 5.08,
shall have been duly obtained, made or given and shall be in full force and
effect, and all terminations or expirations of waiting periods imposed by any
Governmental or Regulatory Authority necessary for the consummation of the
transactions contemplated by this Agreement, including under the HSR Act, shall
have occurred.

    6.06  THIRD PARTY CONSENTS.  The consents (or in lieu thereof waivers)
listed in SECTION 6.06 OF THE DISCLOSURE SCHEDULE shall have been obtained and
shall be in full force and effect.

    6.07  COMPLETION OF THE RESTRUCTURING.  The Restructuring shall have been
completed.

    6.08  ASSIGNMENT OF CONTRACTS.  All rights and obligations under those
Contracts listed on SCHEDULE 6.08 hereto shall have been duly and validly
assigned to the Company or the Subsidiaries by MPC and any required third party
consents shall have been obtained.

    6.09  BENEFITS PLANS.  All Benefits Plans listed on SCHEDULE 6.09 OF THE
DISCLOSURE SCHEDULE hereto shall either have been terminated to the satisfaction
of Purchaser or transferred to Seller in a manner that results in no liability
to Purchaser.

    6.10  RESIGNATION OF SELLER AS MANAGER OF THE COMPANY.  Immediately prior to
Closing, Seller shall have resigned as manager of the Company.

                                      B-25
<PAGE>
                                  ARTICLE VII
                      CONDITIONS TO OBLIGATIONS OF SELLER

    The obligations of Seller hereunder to sell the Units are subject to the
fulfillment, at or before the Closing, of each of the following conditions (all
or any of which may be waived in whole or in part by Seller in its sole
discretion):

    7.01  REPRESENTATIONS AND WARRANTIES.  The representations and warranties
made by Purchaser in this Agreement, taken as a whole, shall be true and correct
in all material respects on and as of the Closing Date as though made on and as
of the Closing Date.

    7.02  PERFORMANCE.  Purchaser shall have performed and complied with, in all
material respects, the agreements, covenants and obligations required by this
Agreement to be so performed or complied with by Purchaser at or before the
Closing.

    7.03  OFFICERS' CERTIFICATES.  Purchaser shall have delivered to Seller a
certificate, dated the Closing Date and executed in the name and on behalf of
Purchaser by the Chairman of the Board, the President or any Executive or Senior
Vice President of Purchaser, substantially in the form and to the effect of
EXHIBIT C hereto, and a certificate, dated the Closing Date and executed by the
Secretary or any Assistant Secretary of Purchaser, substantially in the form and
to the effect of EXHIBIT D hereto.

    7.04  ORDERS AND LAWS.  There shall not be in effect on the Closing Date any
Order or Law restraining, enjoining or otherwise prohibiting or making illegal
the consummation of any of the transactions contemplated by this Agreement.

    7.05  REGULATORY CONSENTS AND APPROVALS.  All consents, approvals and
actions of, filings with and notices to any Governmental or Regulatory Authority
set forth in SECTIONS 2.06 AND 2.07 OF THE DISCLOSURE SCHEDULE necessary to
permit Seller and Purchaser to perform their obligations under this Agreement
and to consummate the transactions contemplated hereby shall have been duly
obtained, made or given and shall be in full force and effect, and all
terminations or expirations of waiting periods imposed by any Governmental or
Regulatory Authority necessary for the consummation of the transactions
contemplated by this Agreement, including under the HSR Act, shall have
occurred.

    7.06  THIRD PARTY CONSENTS.  The consents (or in lieu thereof waivers)
listed in SECTION 7.06 OF THE DISCLOSURE SCHEDULE shall have been obtained and
shall be in full force and effect.

                                  ARTICLE VIII
                       TAX MATTERS AND POST-CLOSING TAXES

    8.01  TAX RETURNS.  (a) Seller and MPC will include the income of the
Company and the Subsidiaries (including any deferred income triggered into
income by Treas. Reg. section 1.1502-13 and any excess loss accounts taken into
account under Treas. Reg. section 1.1502-19) on Seller's or MPC's consolidated,
combined or unitary federal or state or local Tax Returns for all periods
through the Closing Date. Seller shall prepare or cause to be prepared and file
or caused to be filed all Tax Returns for MPC, the Company and the Subsidiaries
for all periods ending on or prior to the Closing Date which are filed after the
Closing Date in accordance with past custom and practice. The Company and the
Subsidiaries will furnish Tax information to Seller for inclusion in the
relevant Tax Returns in accordance with the past custom and practice of MPC, the
Company and the Subsidiaries. Seller shall pay all amounts shown as owing on
such Tax Returns, and shall be liable for all such Taxes for periods ending on
or prior to the Closing Date.

    (b) Purchaser shall prepare or cause to be prepared and Purchaser shall file
or cause to be filed any Tax Returns of MPC, the Company and the Subsidiaries
for Tax periods which begin before the Closing Date and end after the Closing
Date in accordance with past custom and practice. Purchaser will allow Seller an
opportunity to review and comment upon such Tax Returns (including any amended

                                      B-26
<PAGE>
returns) to the extent that they relate to MPC, the Company and the
Subsidiaries. Purchaser will take no position on such Tax Returns that relate to
MPC, the Company and the Subsidiaries that would materially adversely affect
Seller after the Closing Date without the prior written consent of Seller.
Seller will furnish Tax information to Purchaser for inclusion in the relevant
Tax Returns in accordance with the past custom and practice of MPC, the Company
and the Subsidiaries. Seller shall pay to Purchaser within fifteen Business Days
after the date on which Taxes are paid with respect to such periods an amount
equal to the portion of the amounts shown as owing on such Tax Returns which
relates to the portion of such Tax period ending on the Closing Date to the
extent such amounts are not reflected in a reserve (other than any reserve for
deferred Taxes established to reflect timing differences between book and Tax)
for tax liability on MPC's, the Company's or the Subsidiaries' financial
statements made available to the Purchaser pursuant to SECTION 2.09(ii) or
SECTION 4.06 hereof. For purposes of this Section, in the case of any Taxes that
are imposed on a periodic basis and are payable for a Tax period that includes
(but does not end on) the Closing Date, the portion of such Tax which relates to
the portion of such Tax period ending on the Closing Date shall (x) in the case
of any Taxes other than Income Taxes, be deemed to be the amount of such Tax for
the entire Tax period multiplied by a fraction, the numerator of which is the
number of days in the Tax period ending on the Closing Date and the denominator
of which is the number of days in the entire Tax period, and (y) in the case of
any Income Tax, be deemed to be equal to the amount which would be payable if
the relevant Tax period ended on the Closing Date. Any credits relating to a Tax
period that begins before and ends after the Closing Date shall be taken into
account as though the relevant Tax period ended on the Closing Date. All
determinations necessary to give effect to the foregoing allocations shall be
made by Purchaser in a manner consistent with prior practice of MPC, the Company
and the Subsidiaries. Seller shall be liable for Taxes of MPC, the Company and
the Subsidiaries which are attributable to periods ending on or prior to the
Closing Date pursuant to this SECTION 8.01(b) to the extent such Taxes are not
reflected in a reserve (other than any reserve for deferred Taxes established to
reflect timing differences between book and Tax) for tax liability on MPC's, the
Company's or the Subsidiaries' financial statements made available to the
Purchaser pursuant to SECTION 2.09(ii) or SECTION 4.06 hereof. Purchaser shall
be liable for Taxes of the Company and the Subsidiaries which are attributable
to periods after the Closing Date pursuant to this SECTION 8.01(b).

    (c) As soon as reasonably practicable after the signing of this Agreement,
Seller will deliver to Purchaser true and correct copies of the federal Income
Tax workpapers of the Subsidiaries, Income Tax Returns of the Subsidiaries filed
on a stand alone basis within any State, and the Canadian Income Tax Returns of
CMPL, each with respect to the Tax periods from 1997 through 1999.

    8.02  NOTICE OF AUDIT.  Seller and Purchaser agree that if any of them
receives any notice of an audit or examination from any Governmental or
Regulatory Authority with respect to Taxes of MPC, the Company, or the
Subsidiaries for any taxable period or portion thereof ending on or prior to the
Closing Date, then the recipient of such notice shall, within ten days of the
receipt thereof, notify and provide copies of such notice to the other party, as
the case may be, in accordance with the notice provisions of SECTION 13.01.

    8.03  TAX ADJUSTMENTS.  (a) Any Tax refunds that are received by Purchaser
or MPC, Seller, the Company or any Subsidiary, and any amounts credited against
Tax to which Purchaser or MPC, Seller, the Company or any Subsidiary become
entitled, that relate to Tax periods or portions thereof ending on or before the
Closing Date shall be for the account of Seller, and Purchaser shall pay over to
Seller any such refund or the amount of any such credit within fifteen days
after receipt or entitlement thereto. In addition, to the extent that a claim
for refund or a proceeding results in a payment or credit against Tax by a
taxing authority to Purchaser or MPC, Seller, the Company or any Subsidiary of
any amount accrued on MPC's, Seller's, the Company's or any Subsidiary's
financial statements made available to Purchaser pursuant to
SECTION 2.09(a)(ii) or SECTION 4.06 hereof, Purchaser shall pay such amount to
Seller within fifteen days after receipt or entitlement thereto.

                                      B-27
<PAGE>
    (b) Any increase in Tax liability of MPC, the Company or any Subsidiary
which is the responsibility of Seller under the provisions of SECTION 8.01(a) or
SECTION 8.01(b) shall be paid by Seller to Purchaser or the relevant
Governmental or Regulatory Authority as appropriate. Seller has the right to
control the handling and disposition of the audit and any related administrative
or court proceeding which might give rise to such increase in Tax liability of
MPC, the Company or any Subsidiary; PROVIDED, HOWEVER, that the Seller will not
enter into any compromise or agreement to settle any Tax claim pursuant to a Tax
audit or proceeding which could reasonably be expected to have a material
adverse effect on Purchaser, the Company, MPC, or the Subsidiaries for any post
Closing period without the prior written consent of Purchaser (which shall not
be unreasonably withheld). Purchaser shall, and shall cause the Company and the
Subsidiaries to, cooperate fully with Seller with respect to the handling and
disposition of any such audit or related administrative or court proceeding.

    (c) Any increase or decrease in Taxes of MPC, the Company or any Subsidiary
resulting from adjustments made for periods after the Closing Date shall be for
the account of Purchaser.

    8.04  TAX SHARING AGREEMENTS.  All tax sharing agreements or similar
agreements with respect to or involving MPC, the Company or the Subsidiaries
shall be terminated as of the Closing Date and, after the Closing Date, MPC, the
Company and the Subsidiaries shall not be bound thereby or have any liability
thereunder.

    8.05  TRANSFER TAXES.  All transfer, documentary, sales, use, stamp,
registration, and other such Taxes and fees (including any penalties and
interest) incurred in connection with this Agreement shall be paid by Purchaser
when due, and Purchaser will, at its own expense, file all necessary Tax Returns
and other documentation with respect to all such transfer, documentary, sales,
use, stamp, registration and other Taxes and fees, and, Seller will, if
necessary, join in the execution of any such Tax Returns and other
documentation.

    8.06  POST-CLOSING ELECTIONS.  At Seller's request, the Purchaser will cause
the Company and its Subsidiaries to make and/or join with Seller in making any
tax election if the making of such election does not have a material adverse
impact on the Purchaser, the Company or the Subsidiaries for any
post-acquisition period.

    8.07  POST-CLOSING TRANSACTIONS NOT IN THE ORDINARY COURSE.  Purchaser and
Seller agree to report all transactions not in the ordinary course of business
occurring on the Closing Date after Purchaser's purchase of the Units of the
Company on Purchaser's federal income tax return to the extent permitted by
Treas. Reg. section 1.1502-76(b)(1)(B).

    8.08  ALLOCATION OF PURCHASE PRICE.  (a) To the extent that Purchaser and
Seller make a Code section 338(h)(10) election (and any corresponding elections
under state, local or foreign Tax Law) as provided in SECTION 8.09 of this
Agreement, Purchaser and Seller shall cooperate fully with each other in the
making of such election. In particular, and not by way of limitation, Purchaser
shall, within 150 days of the Closing Date, prepare for Seller's review Internal
Revenue Service Form 8023, any attachments to be filed therewith, and an
allocation of the purchase price attributable thereto, all in accordance with
applicable Laws. Upon Seller's approval (which shall not be unreasonably
withheld or delayed), Purchaser and Seller shall jointly execute such form.
Purchaser, Seller, MPC, the Company and the Subsidiaries will file all Tax
Returns (including all amended returns and claims for refund) and information
reports in a manner consistent with such form.

    (b) Purchaser shall, within 150 days of the Closing Date, prepare for
Seller's review Internal Revenue Service Form 8594, and any attachments to be
filed therewith, in accordance with applicable Laws. Upon Seller's approval
(which shall not be unreasonably withheld), Purchaser and Seller shall each file
such Form 8594 with their Income Tax Returns for the year in which Closing
occurs. Purchaser, Seller, MPC, the Company and the Subsidiaries will file all
Tax Returns (including all

                                      B-28
<PAGE>
amended returns and claims for refund) and information reports in a manner
consistent with the allocation contained on such Form 8594.

    8.09  SECTION 338(H)(10) ELECTION.  At Purchaser's option (which must be
exercised by written notice to Seller on or before the Closing Date) Seller will
join with Purchaser in making an election under Code Section 338(h)(10) (and any
corresponding elections under state, local, or foreign tax law) with respect to
the purchase and sale of the stock of any of the Subsidiaries hereunder (other
than CMPL).

    8.10  SECTION 338(G) ELECTION.  At Purchaser's option, Purchaser shall make
an election under Code Section 338(g) (and any corresponding election under
state, local, or foreign tax law) with respect to the purchase of the stock of
CMPL hereunder.

    8.11  NONFOREIGN AFFIDAVIT.  Seller shall furnish Purchaser an affidavit,
stating under penalty of perjury, the transferor's United States taxpayer
identification number and that the transferor is not a foreign person pursuant
to Code Section 1445(b)(2).

    8.12  CODE SECTION 754 ELECTION.  At Purchaser's request, with respect to
any interest in a Person that is taxed as a partnership for federal Income Tax
purposes (a "Partnership") that Purchaser acquires hereunder, Seller agrees to
cause any such Partnership (if Seller has control over such Partnership) to make
a Code section 754 election for the Tax period in which the purchase of the
Units occurs.

                                   ARTICLE IX
                       SURVIVAL; NO OTHER REPRESENTATIONS

    9.01  SURVIVAL OF REPRESENTATIONS, WARRANTIES, COVENANTS AND
AGREEMENTS.  Except as otherwise set forth herein, the representations,
warranties, covenants and agreements contained in this Agreement shall not
survive Closing and there shall be no liability in respect thereof, whether such
liability has accrued prior to the Closing Date or after the Closing Date, on
the part of either party or its officers, directors, employees, agents and
Affiliates. This Section shall not limit in any way the survival and
enforceability of any covenant or agreement of the parties hereto which by its
terms contemplates performance after the Closing Date, which shall survive for
the respective periods set forth herein.

    9.02  NO OTHER REPRESENTATIONS.  Notwithstanding anything to the contrary
contained in this Agreement, it is the explicit intent of each party hereto that
neither Seller, MPC nor anyone on their behalf, including its advisor Goldman,
Sachs & Co. is making any representation or warranty whatsoever, express or
implied, except any representation or warranty contained in ARTICLE II and in
any certificate delivered pursuant to SECTION 6.03. In particular, neither
Seller nor MPC makes any representation or warranty to Purchaser with respect to
(i) the information set forth in the Confidential Offering Memorandum dated
May 2000 prepared by Goldman, Sachs & Co. or (ii) any financial projection or
forecast relating to the Business or Condition of MPC and the Company. With
respect to any projection or forecast delivered by or on behalf of Seller or MPC
to Purchaser, Purchaser acknowledges that (i) there are uncertainties inherent
in attempting to make such projections and forecasts, (ii) it is familiar with
such uncertainties, (iii) it is taking full responsibility for making its own
evaluation of the adequacy and accuracy of all such projections and forecasts
furnished to it and (iv) it shall have no claim against Seller with respect
thereto.

                                   ARTICLE X
                                INDEMNIFICATION

    10.01  TAX INDEMNIFICATION.

    (a) Seller agrees to indemnify, defend and hold harmless, Purchaser, any
Affiliate of Purchaser and their officers, directors, employees, stockholders,
representatives and agents, including after the

                                      B-29
<PAGE>
Closing Date, the Company, and the Subsidiaries (collectively "PURCHASER
INDEMNITEES") from and against any Adverse Consequences the Purchaser
Indemnitees may suffer resulting from, arising out of, or relating to any
liability of Seller, the Company, MPC, and the Subsidiaries (x) for any Taxes of
the Seller, the Company, MPC and any member of the MPC Affiliated Group (other
than the Subsidiaries) and for any Taxes of the Subsidiaries, with respect to
any Tax year or portion thereof ending on or before the Closing Date (or for any
Tax year beginning before and ending after the Closing Date to the extent
allocable (determined in a manner consistent with SECTION 8.01(b)) to the
portion of such period beginning before and ending on the Closing Date), and
(y) for the unpaid Taxes of any Person under Treas. Reg. Section 1.1502-6.

    (b) Purchaser agrees to indemnify Seller, and their officers, directors,
employees, stockholders, representatives and agents (the "SELLER INDEMNITEES"),
from and against any Adverse Consequences Seller Indemnitees may suffer
resulting from, arising out of, or relating to, any liability of Seller for any
Taxes of Purchaser, the Company and the Subsidiaries with respect to any Tax
year or portion thereof after the Closing Date (or for any Tax year beginning
before and ending after the Closing Date to the extent allocable (determined in
a manner consistent with SECTION 8.01(b)), to the portion of such period ending
after the Closing Date.

    (c) The obligations of Seller and Purchaser under this SECTION 10.01 shall
survive until the expiration of the applicable statute of limitations.

    10.02  INDEMNIFICATION FOR RESTRUCTURING; DIVESTITURE; OIL AND GAS
SALE.  (a) Seller agrees to indemnify Purchaser Indemnitees in respect of and
hold each of them harmless from and against any Adverse Consequences suffered,
incurred or sustained by any of them and resulting from, arising out of or
relating to (i) the Restructuring and/or the Divestiture, (ii) any aspect of the
business of Seller (other than the Company and the Subsidiaries) or
(iii) regulatory requirements with respect to the use of the proceeds of the Oil
and Gas Sale. Seller's obligations under this SECTION 10.02 shall survive
indefinitely.

    (b) To the extent such amount is not paid prior to Closing, Seller agrees to
indemnify Purchaser Indemnitees in respect of and hold each of them harmless
with respect to the amount of $3,894,823 set forth on PP&L Montana, LLC's
Invoice Number 82200, dated September 25, 2000 relating to the Wholesale
Transmission Services Agreement.

    10.03  OTHER INDEMNIFICATION.  Subject to the other Sections of this
ARTICLE X, Purchaser shall indemnify the Seller and its directors, officers,
employees and agents in respect of, and hold each of them harmless from and
against, any and all Adverse Consequences suffered, incurred or sustained by any
of them or of or relating to MPC, the Company and the Subsidiaries resulting
from or arising out of the operation of the business of MPC, the Company and the
Subsidiaries from and after Closing (including, without limitation, Adverse
Consequences arising out of or relating to any Environmental Law); PROVIDED,
HOWEVER, that such indemnity shall not apply until the total amount of such
Adverse Consequences shall exceed $1,000,000 at which time the entire amount of
all such Adverse Consequences shall be indemnified hereunder.

    10.04  SPECIAL ENVIRONMENTAL INDEMNITY.  Seller shall indemnify, defend and
hold harmless Purchaser Indemnitees against any Adverse Consequences which
Purchaser Indemnitees may suffer, sustain, or become subject to, resulting from
or arising out of: any claims, damages, liabilities, taxes, injuries to Persons,
property or natural resources, fines, penalties, costs and expenses, including
without limitation, settlement costs and reasonable legal, accounting or other
expert fees and costs, incurred in connection with investigating or defending
any action (an "ENVIRONMENTAL LOSS") sustained or required to be paid by reason
of, or arising out of or caused by any act or omission occurring, or condition
existing, on or prior to the Closing Date which related directly or indirectly
to the business or operations or facilities (past or present) of MPC, the
Company or its Subsidiaries, and which relate to a violation of or liability to
pay costs, penalties, fines or damages under Environmental Laws; PROVIDED,

                                      B-30
<PAGE>
HOWEVER, that such indemnity shall be subject to the following: (i) it shall not
apply until the total amount of such Environmental Loss exceeds $50,000,000;
(ii) after the first $50,000,000 of Environmental Loss, Seller shall be liable
for the next $25,000,000 of Environmental Loss; (iii) Seller shall be liable for
50% of all Environmental Loss in excess of $75,000,000 in the aggregate; and
(iv) in no event shall Seller's obligations under this SECTION 10.04 exceed
$100,000,000. Seller's obligations under this SECTION 10.04 shall survive for a
period of five years from the Closing Date.

    10.05  SPECIAL LITIGATION INDEMNITY.  Seller shall indemnify, defend and
hold harmless Purchaser Indemnitees against and pay on behalf of or reimburse
Purchaser Indemnitees as and when incurred for any Adverse Consequences which
Purchaser Indemnitees may suffer, sustain or become subject to, resulting from
or arising out of those matters set forth on SCHEDULE 10.05 hereto. Seller's
obligations under this SECTION 10.05 shall survive indefinitely. Purchaser
agrees that it will make any employees of the Company or the Subsidiaries
connected to the matters set forth in SCHEDULE 10.05 reasonably available to
Seller, upon Seller's reasonable request and at Seller's sole expense, for the
purposes of defending the matters set forth in this SECTION 10.05.

    10.06  METHOD OF ASSERTING CLAIMS.  All claims for indemnification by any
Indemnified Party under this ARTICLE X will be asserted and resolved as follows:

    (a) In the event any claim or demand in respect of which an Indemnified
Party might seek indemnity under this ARTICLE X is asserted against or sought to
be collected from such Indemnified Party by a Person other than Seller or any
Affiliate of Seller or of Purchaser (a "THIRD PARTY CLAIM"), the Indemnified
Party shall deliver a Claim Notice with reasonable promptness to the
Indemnifying Party. The Indemnifying Party will notify the Indemnified Party as
soon as practicable within the Dispute Period whether the Indemnifying Party
disputes its liability to the Indemnified Party under this ARTICLE X and whether
the Indemnifying Party desires, at its sole cost and expense, to defend the
Indemnified Party against such Third Party Claim.

        (i) If the Indemnifying Party notifies the Indemnified Party within the
    Dispute Period that the Indemnifying Party desires to defend the Indemnified
    Party with respect to the Third Party Claim pursuant to this
    SECTION 10.06(A), then the Indemnifying Party will have the right to defend,
    at the sole cost and expense of the Indemnifying Party, such Third Party
    Claim by all appropriate proceedings, which proceedings will be vigorously
    and diligently prosecuted by the Indemnifying Party to a final conclusion or
    will be settled at the discretion of the Indemnifying Party (but only with
    the consent of the Indemnified Party, which consent will not be unreasonably
    withheld, in the case of any settlement that provides for any relief other
    than the payment of monetary damages as to which the Indemnified Party will
    be indemnified in full). The Indemnifying Party will have full control of
    such defense and proceedings, including (except as provided in the
    immediately preceding sentence) any settlement thereof and shall keep the
    Indemnified Party informed of all material developments relating to such
    proceedings; PROVIDED, HOWEVER, that if requested by the Indemnifying Party,
    the Indemnified Party will, at the sole cost and expense of the Indemnifying
    Party, cooperate with the Indemnifying Party and its counsel in contesting
    any Third Party Claim that the Indemnifying Party elects to contest, or, if
    appropriate and related to the Third Party Claim in question, in making any
    counterclaim against the Person asserting the Third Party Claim, or any
    cross-complaint against any Person (other than the Indemnified Party or any
    of its Affiliates). The Indemnified Party may retain separate counsel to
    represent it in, but not control, any defense or settlement of any Third
    Party Claim controlled by the Indemnifying Party pursuant to this
    clause (i), and the Indemnified Party will bear its own costs and expenses
    with respect to such separate counsel except as provided in the preceding
    sentence and except that the Indemnifying Party will pay the costs and
    expenses of such separate counsel if (x) in the Indemnified Party's good
    faith judgment, it is advisable, based on advice of counsel, for the
    Indemnified Party to be represented by separate counsel because a conflict
    or potential conflict exists between the Indemnifying Party and the
    Indemnified Party or (y) the named parties to such

                                      B-31
<PAGE>
    Third Party Claim include both the Indemnifying Party and the Indemnified
    Party and the Indemnified Party determines in good faith, based on advice of
    counsel, that defenses are available to it that are unavailable to the
    Indemnifying Party. Notwithstanding the foregoing, the Indemnified Party may
    retain or take over the control of the defense or settlement of any Third
    Party Claim the defense of which the Indemnifying Party has elected to
    control if the Indemnified Party irrevocably waives its right to indemnity
    under this ARTICLE X with respect to such Third Party Claim.

        (ii) If the Indemnifying Party fails to notify the Indemnified Party
    within the Dispute Period that the Indemnifying Party desires to defend the
    Third Party Claim pursuant to SECTION 10.06(a), then the Indemnified Party
    will have the right to defend, at the sole cost and expense of the
    Indemnifying Party, the Third Party Claim by all appropriate proceedings,
    which proceedings will be vigorously and diligently prosecuted by the
    Indemnified Party to a final conclusion or will be settled at the discretion
    of the Indemnified Party (with the consent of the Indemnifying Party, which
    consent will not be unreasonably withheld). The Indemnified Party will have
    full control of such defense and proceedings, including (except as provided
    in the immediately preceding sentence) any settlement thereof; PROVIDED,
    HOWEVER, that if requested by the Indemnified Party, the Indemnifying Party
    will, at the sole cost and expense of the Indemnifying Party, cooperate with
    the Indemnified Party and its counsel in contesting any Third Party Claim
    which the Indemnified Party is contesting, or, if appropriate and related to
    the Third Party Claim in question, in making any counterclaim against the
    Person asserting the Third Party Claim, or any cross-complaint against any
    Person (other than the Indemnifying Party or any of its Affiliates).
    Notwithstanding the foregoing provisions of this clause (ii), if the
    Indemnifying Party has notified the Indemnified Party within the Dispute
    Period that the Indemnifying Party disputes its liability hereunder to the
    Indemnified Party with respect to such Third Party Claim and if such dispute
    is resolved in favor of the Indemnifying Party in the manner provided in
    clause (iii) below, the Indemnifying Party will not be required to bear the
    costs and expenses of the Indemnified Party's defense pursuant to this
    clause (ii) or of the Indemnifying Party's participation therein at the
    Indemnified Party's request, and the Indemnified Party will reimburse the
    Indemnifying Party in full for all reasonable costs and expenses incurred by
    the Indemnifying Party in connection with such litigation. The Indemnifying
    Party may retain separate counsel to represent it in, but not control, any
    defense or settlement controlled by the Indemnified Party pursuant to this
    clause (ii), and the Indemnifying Party will bear its own costs and expenses
    with respect to such participation.

       (iii) If the Indemnifying Party notifies the Indemnified Party that it
    does not dispute its liability to the Indemnified Party with respect to the
    Third Party Claim under this ARTICLE X or fails to notify the Indemnified
    Party within the Dispute Period whether the Indemnifying Party disputes its
    liability to the Indemnified Party with respect to such Third Party Claim,
    the Adverse Consequences arising from such Third Party Claim will be
    conclusively deemed a liability of the Indemnifying Party under this
    Article X and the Indemnifying Party shall pay the amount of such Adverse
    Consequences to the Indemnified Party on demand following the final
    determination thereof. If the Indemnifying Party has timely disputed its
    liability with respect to such claim, the Indemnifying Party and the
    Indemnified Party will proceed in good faith to negotiate a resolution of
    such dispute, and if not resolved through negotiations within the Resolution
    Period, such dispute shall be resolved by litigation in a court of competent
    jurisdiction.

        (iv) Notwithstanding any other provision of this SECTION 10.06(a) to the
    contrary, Purchaser shall have the right to defend all Third Party Claims
    covered by SECTION 10.04, by all appropriate proceedings, which proceedings
    will be vigorously and diligently prosecuted by Purchaser to a final
    conclusion or will be settled at the discretion of Purchaser (but only with
    the consent of Seller, which consent will not be unreasonably withheld, in
    the case of any settlement that provides for any relief involving Seller
    other than the payment of monetary damages). Purchaser will have full

                                      B-32
<PAGE>
    control of such defense and proceedings, including (except as provided in
    the immediately preceding sentence) any settlement thereof, and shall keep
    Seller informed of all material developments relating to such proceedings.
    Seller may retain separate counsel to represent it in, but not control, any
    defense or settlement of any Third Party Claim controlled by Purchaser
    pursuant to this SECTION 10.06(a)(iv) and Seller will bear its own costs and
    expenses with respect to such counsel.

    (b) In the event any Indemnified Party should have a claim under this
ARTICLE X against any Indemnifying Party that does not involve a Third Party
Claim, the Indemnified Party shall deliver an Indemnity Notice with reasonable
promptness to the Indemnifying Party. If the Indemnifying Party notifies the
Indemnified Party that it does not dispute the claim described in such Indemnity
Notice or fails to notify the Indemnified Party within the Dispute Period
whether the Indemnifying Party disputes the claim described in such Indemnity
Notice, the Adverse Consequences arising from the claim specified in such
Indemnity Notice will be conclusively deemed a liability of the Indemnifying
Party under this ARTICLE X and the Indemnifying Party shall pay the amount of
such Adverse Consequences to the Indemnified Party on demand following the final
determination thereof. If the Indemnifying Party has timely disputed its
liability with respect to such claim, the Indemnifying Party and the Indemnified
Party will proceed in good faith to negotiate a resolution of such dispute, and
if not resolved through negotiations within the Resolution Period, such dispute
shall be resolved by litigation in a court of competent jurisdiction.

    (c) In the event of any claim for indemnity under this ARTICLE X, each party
agrees to give reasonable access to its Books and Records and employees in
connection with the matters for which indemnification is sought to the extent a
party reasonably deems necessary in connection with its rights and obligations
under this ARTICLE X.

    10.07  REQUIREMENTS FOR INDEMNITY.  Notwithstanding anything to the contrary
contained in this Agreement, no amounts of indemnity shall be payable as a
result of any claim in respect of any and all Adverse Consequences arising under
this ARTICLE X, (a) unless the Indemnified Party has given the Indemnifying
Party a Claim Notice or Indemnity Notice, as applicable, with respect to such
claim, setting forth in reasonable detail the specific facts and circumstances
pertaining thereto, (i) as soon as practical following the time at which an
officer of the Indemnified Party discovered or reasonably should have discovered
such claim and (ii) in any event prior to the applicable Cut-off Date, and
(b) to the extent that the Indemnified Party had a reasonable opportunity, but
failed, in good faith to mitigate the Adverse Consequences, including but not
limited to the failure to use commercially reasonable efforts to recover under a
policy of insurance or under a contractual right of set-off or indemnity.

    10.08  EXCLUSIVITY.  After the Closing, to the extent permitted by Law, the
indemnities set forth in this ARTICLE X shall be the exclusive remedies of
Purchaser and Seller and their respective officers, directors, employees, agents
and Affiliates for any misrepresentation, breach of warranty or nonfulfillment
or failure to be performed of any covenant or agreement contained in this
Agreement, and the parties shall not be entitled to a rescission of this
Agreement or to any further indemnification rights or claims of any nature
whatsoever in respect thereof, all of which the parties hereto hereby waive.

                                   ARTICLE XI
                                  TERMINATION

    11.01  TERMINATION.  This Agreement may be terminated, and the transactions
contemplated hereby may be abandoned, at any time prior to the Closing, whether
prior to or after the MPC Stockholders' Approval:

    (a) by mutual written agreement of Seller, MPC and Purchaser;

                                      B-33
<PAGE>
    (b) by Seller, MPC or Purchaser, in the event that any Order or Law becomes
effective, and is non-appealable, restraining, enjoining or otherwise
prohibiting or making illegal the consummation of any of the transactions
contemplated by this Agreement, upon notification of the non-terminating party
by the terminating party;

    (c) by Seller, MPC or Purchaser if the MPC Stockholders' Approval shall not
be obtained by reason of the failure to obtain the requisite vote upon a vote
actually held at the MPC Stockholders' Meeting;

    (d) by Seller, MPC or Purchaser (provided that the terminating party is not
then in material breach of any representation, warranty, covenant or other
agreement contained herein) if there shall have been a material breach of any of
the representations, warranties, covenants or other agreements contained in this
Agreement on the part of the other party, which breach either (i) is not cured
with fifteen (15) days following written notice by the terminating party to the
party committing such breach, or (ii) by its nature, cannot be cured prior to
March 31, 2002;

    (e) at any time after March 31, 2002, by Seller, MPC or Purchaser upon
notification of the non-terminating party by the terminating party if the
Closing shall not have occurred on or before such date and such failure to
consummate is not caused by a breach of this Agreement by the terminating party;

    (f) by Purchaser if (i) the Board of Directors of MPC shall have (A) failed
to recommend, or withdrawn, modified or amended in any respect adverse to
Purchaser its approval or recommendation of, this Agreement or the transactions
contemplated herein or resolved to do so, or (B) approved or recommended a
Superior Proposal from a Person (other than Purchaser) or resolved to do so, or
(ii) Seller or MPC breaches any of its agreements in SECTION 4.04, SECTION 4.11
or SECTION 4.12; or

    (g) by Seller or MPC (but only prior to adoption of the MPC Stockholders'
Approval), if the Board of Directors of MPC, by majority vote, shall have
determined that an Acquisition Proposal constitutes a Superior Proposal;
provided that, (i) MPC shall have provided to Purchaser three (3) Business Days'
notice of its intention to terminate this Agreement pursuant to this
SECTION 11.01(g) (which notice shall include the most current version of the
agreement to be entered into in connection with the Superior Proposal (or a
description of all of the material terms and conditions thereof)), (ii) MPC has
complied with the provisions of SECTION 4.04, SECTION 4.11 and SECTION 4.12,
(iii) the Superior Proposal is pending at the time of such termination,
(iv) the Board of Directors shall have determined in good faith, after giving
effect to all concessions and modifications which may be offered by Purchaser
pursuant to clause (v) below, and after consultation with its financial advisors
and outside legal counsel, that such proposal is a Superior Proposal,
(v) during the three (3) Business Days' notice referred to in (i) above, Seller
and MPC shall, and shall cause the financial and legal advisors to, negotiate in
good faith with Purchaser with respect to any modifications to the terms of this
Agreement proposed by Purchaser that would enable MPC and Purchaser to proceed
with the transactions contemplated hereby, and (vi) it shall be a condition
precedent to the termination of this Agreement by Seller or MPC pursuant to this
SECTION 11.01(g) that Seller and MPC shall have made the payment of the Fee and
Expenses required by SECTION 11.03.

    11.02  EFFECT OF TERMINATION.  If this Agreement is validly terminated
pursuant to SECTION 11.01 and subject to the payment of amounts due under
SECTION 11.03 below, this Agreement will forthwith become null and void, and
there will be no liability or obligation on the part of Seller, MPC or Purchaser
(or any of their respective officers, directors, employees, agents or other
representatives or Affiliates), except that (i) the provisions with respect to
expenses in SECTION 13.03 and confidentiality in SECTION 13.05 will continue to
apply following any such termination, and (ii) that nothing contained herein
shall relieve any party hereto from liability for willful breach of its
representations, warranties, covenants or agreements contained in this
Agreement.

                                      B-34
<PAGE>
    11.03  FEES AND EXPENSES.

    (a) If this Agreement is terminated (i) pursuant to SECTION 11.01(f)or (g),
then Seller and MPC, jointly and severally, shall pay to Purchaser,
(A) simultaneously with any termination by Seller or MPC pursuant to
SECTION 11.01(g), and (B) within one Business Day following any termination by
Purchaser contemplated by SECTION 11.01(f), a fee, in cash, equal to $50,000,000
(the "FEE"), and (ii) by Purchaser pursuant to SECTION 11.01(d), and any Person
shall have made an Acquisition Proposal prior to such termination, then MPC and
Seller, jointly and severally, shall pay to Purchaser on the date of execution
of a definitive agreement with respect to an Acquisition Proposal, or, if
earlier, consummation of an Acquisition Proposal, the Fee, PROVIDED, HOWEVER,
that no Fee shall be payable pursuant to clause (ii) of this SECTION 11.03
unless and until, within 12 months of such termination, MPC or Seller enter into
a definitive agreement to consummate, or consummates, any transaction the
proposal of which would have constituted an Acquisition Proposal, and PROVIDED,
FURTHER, that Seller and MPC shall not in any event be obligated to pay more
than one such fee with respect to all such occurrences and such termination. It
is understood and agreed that the Fee constitutes liquidated damages and not a
penalty.

    (b) In addition to the Fee payable pursuant to SECTION 11.03(a), (i) within
one Business Day after the termination of this Agreement pursuant to
SECTION 11.01(c), (f) or (g), or (ii) if this Agreement is terminated by
Purchaser pursuant to SECTION 11.01(d) and Purchaser is entitled to receive a
Fee pursuant to SECTION 11.03(a) in connection with such termination, on the
date of the execution of a definitive agreement with respect to an Acquisition
Proposal, or, if earlier, consummation of an Acquisition Proposal, Seller and
MPC, jointly and severally, shall pay all of Purchaser's Expenses (as defined
below) up to a maximum payment pursuant to this SECTION 11.03(b) of $10,000,000.
The term "Expenses" shall include all out-of-pocket expenses and fees (including
without limitation fees and expenses payable to all banks, investment banking
firms and other financial institutions and their respective agents and counsel
for arranging or providing financial advice or financing commitments with
respect to this Agreement and the transactions contemplated hereby and all
reasonable fees and expenses of counsel, accountants, experts and consultants to
Purchaser) actually incurred by Purchaser or on its behalf in connection with
the consummation of all transactions contemplated by this Agreement.

                                  ARTICLE XII
                                  DEFINITIONS

    12.01  DEFINITIONS.  (a) Defined Terms. As used in this Agreement, the
following defined terms have the meanings indicated below:

    "1935 ACT" has the meaning ascribed to it in SECTION 2.25.

    "ACQUISITION PROPOSAL" means any proposal or offer with respect to (i) a
merger, reorganization, consolidation, business combination, recapitalization,
liquidation, dissolution or similar transaction involving (x) prior to the
Restructuring MPC or any of its subsidiaries, and (y) from and after the
Restructuring but prior to Closing, Seller or any of its subsidiaries, or
(ii) any direct or indirect acquisition of all or any substantial portion of the
assets or 10% or more of the equity securities of (x) prior to the
Restructuring, MPC or any of its subsidiaries, and (y) from and after the
Restructuring but prior to Closing, Seller or any of its subsidiaries, other
than, in any such case, the transactions contemplated by this Agreement and the
Divestiture.

    "ACTIONS OR PROCEEDINGS" means any action, suit, proceeding, claims,
demands, complaints, arbitration or Governmental or Regulatory Authority
investigation.

    "ADVERSE CONSEQUENCES" means all actions, suits, proceedings, hearings,
investigations, charges, complaints, claims, demands, injunctions, judgments,
orders, decrees, rulings, damages, dues, penalties, fines, deficiencies, costs,
liabilities, obligations, taxes, liens, losses, expenses, and fees, including,
without

                                      B-35
<PAGE>
limitation, court costs, interest and reasonable fees of attorneys, accountants
and other experts or other reasonable expenses of litigation or other
proceedings or of any claim, default or assessment.

    "AFFILIATE" means any Person that directly, or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with the Person specified. For purposes of this definition, control of a Person
means the power, direct or indirect, to direct or cause the direction of the
management and policies of such Person whether by Contract or otherwise.

    "AFFILIATE CONTRACT" has the meaning ascribed to it in SECTION 4.08.

    "AFFILIATED GROUP" means any affiliated group within the meaning of Code
Section 1504(a), or any similar group defined under a similar provision of
state, local or foreign Law.

    "AGREEMENT" means this Stock Purchase Agreement and the Disclosure Schedule
and the certificates delivered in accordance with SECTIONS 6.03 and 7.03, as the
same shall be amended from time to time.

    "ASSETS AND PROPERTIES" of any Person means all assets and properties of
every kind, nature, character and description (whether real, personal or mixed,
whether tangible or intangible, and wherever situated), including the goodwill
related thereto, operated, owned or leased by such Person.

    "BENEFICIALLY" means the beneficial owner of such securities under
Rule 13d-3 of the Securities Exchange Act of 1934, as amended, including
securities which such Person has a right to acquire (whether such right is
exercisable immediately or only after the passage of time).

    "BENEFIT PLAN" means any Plan established by MPC, the Company or any
Subsidiary, or any predecessor or Affiliate of any of the foregoing, existing at
the Closing Date (or at any time within the five (5) year period prior thereto
for a Plan subject to Title IV of ERISA), to which MPC, the Company or any
Subsidiary contributes or has contributed, or under which any employee, former
employee or director of MPC, the Company or any Subsidiary or any beneficiary
thereof is covered, is eligible for coverage or has benefit rights.

    "BACKGROUND MATERIALS" has the meaning ascribed to it in SECTION 3.11.

    "BOOKS AND RECORDS" means all files, documents, instruments, papers, books
and records relating to the Business or Condition of MPC and the Company,
including without limitation financial statements, Tax Returns and related work
papers and letters from accountants, budgets, pricing guidelines, ledgers,
journals, deeds, title policies, minute books, stock certificates and books,
stock transfer ledgers, Contracts, Licenses, customer lists, computer files and
programs, retrieval programs, operating data and plans and environmental studies
and plans.

    "BUDGET" means, with respect to fiscal year 2000, the FY2000 operating and
capital budget of MPC and the Subsidiaries attached as SECTION 12.01 OF THE
DISCLOSURE SCHEDULE hereto, and, with respect to fiscal year 2001, the FY2001
operating and capital budget of MPC and the Subsidiaries which shall be
delivered to Purchaser not later than December 15, 2000 provided that the
amounts budgeted therein shall be within 5% (plus or minus) of the amounts set
forth in ANNEX II attached hereto for the line items set forth thereon, unless
MPC has previously notified Purchaser and Purchaser has consented to such other
amounts, such consent not to be unreasonably withheld or delayed.

    "BUSINESS DAY" means a day other than Saturday, Sunday or any day on which
banks located in the State of Montana are authorized or obligated to close.

    "BUSINESS OR CONDITION OF MPC AND THE COMPANY" means the business, financial
condition or results of operations of MPC, the Company and the Subsidiaries
taken as a whole.

                                      B-36
<PAGE>
    "CAUSE" means the failure to satisfactorily perform job duties, disruption
of the employer's operation, or other legitimate business reason; provided,
however, that legitimate business reasons shall not include reductions in force,
reorganizations, nor restructuring.

    "CERCLA" means the Comprehensive Environmental Response, Compensation and
Liability Act of 1980, as amended and the rules and regulations promulgated
thereunder.

    "CERCLIS" means the Comprehensive Environmental Response and Liability
Information System, as provided by 40 C.F.R. Section300.5.

    "CLAIM NOTICE" means written notification pursuant to SECTION 10.06(a) of a
Third Party Claim as to which indemnity under ARTICLE X is sought by an
Indemnified Party, enclosing a copy of all papers served, if any, and specifying
the nature of and the basis for such Third Party Claim and for the Indemnified
Party's claim against the Indemnifying Party under ARTICLE X, together with the
amount of, or if not then reasonably determinable, the estimated amount,
determined in good faith, of the Adverse Consequences arising from such Third
Party Claim.

    "CLOSING" means the closing of the transactions contemplated by
SECTION 1.03.

    "CLOSING DATE" means (a) the fifth Business Day after the day on which the
last of the consents, approvals, actions, filings, notices or waiting periods
described in or related to the filings described in SECTIONS 6.04 through 6.10
and SECTIONS 7.04 through 7.06 has been obtained, made or given or has expired,
as applicable, or (b) such other date as Purchaser and Seller mutually agree
upon in writing.

    "CMPL" means Canadian-Montana Pipe Line Corporation, an Alberta corporation.

    "COAL SALE" means the sale, by Entech, of all the outstanding capital stock
of Basin Resources Inc., a Colorado corporation, Horizon Coal Services Inc., a
Montana corporation, North Central Energy Company, a Colorado corporation,
Northwestern Resources Co., a Montana corporation and Western Energy Company, a
Montana corporation.

    "CODE" means the Internal Revenue Code of 1986, as amended, or any
replacement, and the rules and regulations promulgated thereunder.

    "COLSTRIP 1, 2 AND 3 TRANSMISSION ASSETS" has the meaning ascribed to it in
that certain Asset Purchase Agreement, dated October 31, 1998, as amended, by
and between PPL Montana LLC and MPC.

    "COMMON STOCK" means the common stock, par value $.01 per share, of the
Company.

    "COMPANY" has the meaning ascribed to it in the forepart of this Agreement.

    "CONTRACT" means any agreement, lease, license, evidence of Indebtedness,
mortgage, indenture, security agreement or other contract; PROVIDED, HOWEVER,
that Contract shall not mean a transaction under a published tariff approved by
a Governmental or Regulatory Authority.

    "COVERED PARTICIPANTS" has the meaning ascribed to it in SECTION 5.04(e).

    "CUT-OFF DATE" means, with respect to any representation, warranty, covenant
or agreement contained in this Agreement, the date on which such representation,
warranty, covenant or agreement ceases to survive as provided in SECTION 9.01 or
ARTICLE X.

    "DATA ROOM" has the meaning ascribed to it in SECTION 3.11.

    "DEFINED BENEFIT PLAN" means each Benefit Plan which is subject to Part 3 of
Title I of ERISA, Section 412 of the Code or Title IV of ERISA.

    "DES" means Discovery Energy Solutions, Inc., a Montana corporation.

                                      B-37
<PAGE>
    "DISCLOSURE SCHEDULE" means the record delivered to Purchaser by Seller
herewith and dated as of the date hereof, containing all lists, descriptions,
exceptions and other information and materials as are required to be included
therein by Seller pursuant to this Agreement.

    "DISPUTE PERIOD" means the period ending thirty (30) days following receipt
by an Indemnifying Party of either a Claim Notice or an Indemnity Notice.

    "DIVESTITURE" means the completion of the IPP Sale, the Oil and Gas Sale and
the Coal Sale.

    "DOLLAR" or "$" means a United States dollar, the lawful currency of the
United States, unless otherwise designated.

    "ENTECH" means Entech, Inc., a Montana corporation.

    "ENVIRONMENTAL LAW" means any Law or Order relating to the regulation or
protection of human health, public health or safety or the environment or to
emissions, discharges, releases or threatened releases of pollutants,
contaminants, chemicals or industrial, toxic or hazardous substances or wastes
into the environment (including, without limitation, ambient air, soil, surface
water, ground water, wetlands, land or subsurface strata), or otherwise relating
to the manufacture, processing, distribution, use, treatment, storage, disposal,
transport or handling of pollutants, contaminants, chemicals or industrial,
toxic or hazardous substances or wastes.

    "ENVIRONMENTAL LOSS" has the meaning ascribed to it in SECTION 10.04.

    "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended, and the rules and regulations promulgated thereunder.

    "ERISA AFFILIATE" means any Person who is in the same controlled group of
corporations or who is under common control with Seller or, before the Closing,
the Company or any Subsidiary (within the meaning of Section 414 of the Code).

    "EXCHANGE ACT" means the Exchange Act of 1934, as amended.

    "EXON-FLORIO AMENDMENT" means Section 721 of the Defense Production Act of
1950, as amended, and any successor thereto and the regulations issued pursuant
thereto or in consequence thereof.

    "EXPENSES" shall have the meaning ascribed to it in SECTION 11.03(b).

    "FEE" shall have the meaning ascribed to it in SECTION 11.03(a).

    "FCC" means the Federal Communications Commission, or any successor entity
thereto.

    "FERC" means the Federal Energy Regulatory Commission, or any successor
entity thereto.

    "FINANCIAL STATEMENTS" means the consolidated financial statements of MPC
and its consolidated subsidiaries delivered to Purchaser pursuant to
SECTION 2.09 or 4.06.

    "GAAP" means United States generally accepted accounting principles,
consistently applied throughout the specified period and in the immediately
prior comparable period.

    "GOVERNMENTAL OR REGULATORY AUTHORITY" means any court, tribunal,
arbitrator, authority, agency, commission, official or other instrumentality of
the United States or Canada or any state, county, city or other political
subdivision.

    "HSR ACT" means Section 7A of the Clayton Act (Title II of the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended) and the rules
and regulations promulgated thereunder.

    "INCOME TAXES" means any federal, state, local, or foreign income Tax,
including any interest, penalty, or addition thereto, whether disputed or not.

                                      B-38
<PAGE>
    "INCOME TAX RETURN" means any return, declaration, report, claim for refund,
or information return or statement relating to Income Taxes, including any
schedule or attachment thereto.

    "INDEBTEDNESS" means, with respect to any Person, whether recourse is to all
or a portion of the Assets or Properties of such Person and whether or not
contingent, (i) every obligation of such Person for money borrowed, (ii) every
obligation for such Person evidenced by bonds, debentures, notes or similar
instruments, including obligations incurred in connection with the acquisition
of property, assets or businesses, (iii) every obligation of such Person issued
or assumed as the deferred purchase price of property or services (but excluding
trade accounts payable or accrued liabilities arising in the ordinary course of
business), (iv) every capital lease obligation of such Person, (v) the maximum
fixed redemption or repurchase price of mandatorily redeemable stock of such
Person at the time of determination, (vii) every obligation to pay rent or other
payment amounts of such Person with respect to any sale and leaseback
transaction to which such Person is a party, (vii) all obligations under
interest rate protection, hedging or similar agreements, (ix) every obligation
of the type referred to in clauses (i) through (vii) of another Person and all
dividends of another Person the payment of which, in either case, such Person
has guaranteed or is responsible or liable for, directly or indirectly, as
obligor, guarantor or otherwise, or which is secured by a Lien on any Asset or
Property of such Person.

    "INDEMNIFIED PARTY" means any Person claiming indemnification under any
provision of ARTICLE X.

    "INDEMNIFYING PARTY" means any Person against whom a claim for
indemnification is being asserted under any provision of ARTICLE X.

    "INDEMNITY NOTICE" means written notification pursuant to SECTION 10.06(b)
of a claim for indemnity under ARTICLE X by an Indemnified Party, specifying the
nature of and basis for such claim, together with the amount or, if not then
reasonably determinable, the estimated amount, determined in good faith, of the
Adverse Consequences arising from such claim.

    "INDEPENDENT TRANSMISSION COMPANY" means a for-profit independent
transmission company proposed to be created by MPC, Avista Corp., Portland
General Electric Co., Puget Sound Energy, Inc., Sierra Pacific Power Co., and
Nevada Power Co., pursuant to the Independent Transmission Company Memorandum of
Understanding dated April 26, 2000, or any other independent transmission
company of similar nature that conforms to FERC Order 2000, whether in existence
or proposed to be created, of which MPC, the Company or any Subsidiary is a
member or proposes to be a member.

    "INTELLECTUAL PROPERTY" means all patents and patent rights, trademarks and
trademark rights, trade names and trade name rights, service marks and service
mark rights, service names and service name rights, brand names, inventions,
copyrights and copyright rights, processes, formulae, trade dress, business and
product names, logos, slogans, trade secrets, industrial models, processes,
designs, methodologies, computer programs (including all source codes but
excluding third party commercial software used in the ordinary course of
business) and related documentation, technical information, manufacturing,
engineering and technical drawings, know-how and all pending applications for
and registrations of patents, trademarks, service marks and copyrights.

    "INTERIM FINANCIAL STATEMENT DATE" means July 31, 2000.

    "INTERIM FINANCIAL STATEMENTS" means the Financial Statements for the most
recent fiscal period of MPC delivered to Purchaser pursuant to
SECTION 2.09(a)(ii).

    "IPP SALE" means the sale of the outstanding capital stock of Continental
Energy Services, Inc. a Montana corporation, by Entech.

    "IRS" means the United States Internal Revenue Service or any successor
agency.

                                      B-39
<PAGE>
    "KNOWLEDGE OF SELLER AND MPC" (including any correlative term) with respect
to a particular fact or other matters, means that any officer of MPC, the
Company or any Subsidiary, or a reasonably prudent individual in the position of
such officer, after due inquiry, knows or is actually aware of such fact or
other matter.

    "LAWS" means all laws, statutes, rules, regulations, ordinances and other
pronouncements having the effect of law of the United States, any foreign
country or any domestic or foreign state, county, city or other political
subdivision or of any Governmental or Regulatory Authority.

    "LICENSES" means all licenses, permits, certificates of authority,
authorizations, approvals, registrations, franchises and similar consents
granted or issued by any Governmental or Regulatory Authority.

    "LIENS" means any mortgage, pledge, assessment, security interest, lease,
lien, adverse claim, levy, charge or other encumbrance of any kind, or any
conditional sale Contract, title retention Contract or other Contract to give
any of the foregoing.

    "MPC" has the meaning ascribed to it in the forepart of this Agreement.

    "MPC AFFILIATED GROUP" means the Affiliated Group of which MPC has been or
is the common parent including MPC.

    "MPC 401(k) PLAN" means the Montana Power Company and Subsidiaries Employee
Retirement Savings Plan, as in effect from time to time.

    "MPC PENSION PLAN" has the meaning ascribed to it in SECTION 5.04(g).

    "MPC STOCK OPTION" has the meaning ascribed to it in SECTION 5.04(i).

    "MPC STOCKHOLDERS' APPROVAL" has the meaning ascribed to it in
SECTION 4.12.

    "MPC STOCKHOLDERS' MEETING" has the meaning ascribed to it in SECTION 4.11.

    "NPL" means the National Priorities List under CERCLA.

    "OIL AND GAS SALE" means the sale, by Entech, of all the outstanding capital
stock and assets of Altana Exploration Company, a Montana corporation, and all
the outstanding capital stock of Entech Gas Ventures, Inc., a Montana
corporation, Glacier Gas Company, a Montana corporation, North American
Resources Company, a Montana corporation, The Montana Power Gas Company, a
Montana corporation, The Montana Power Trading & Marketing Company, a Montana
corporation, and Altana Exploration Ltd., an Alberta corporation.

    "OPTION" with respect to any Person means any security, convertible
security, right, subscription, call, warrant, option, "phantom" stock right or
other Contract that gives the right to (i) purchase or otherwise receive or be
issued any shares of capital stock of such Person or any security of any kind
convertible into or exchangeable or exercisable for any shares of capital stock
of such Person or (ii) receive or exercise any benefits or rights similar to any
rights enjoyed by or accruing to the holder of shares of capital stock of such
Person, including any rights to participate in the equity or income of such
Person or to participate in or direct the election of any directors or officers
of such Person or the manner in which any shares of capital stock of such Person
are voted.

    "ORDER" means any writ, judgment, decree, injunction or other order of any
Governmental or Regulatory Authority (in each such case whether preliminary or
final).

    "PARTNERSHIP" has the meaning ascribed to it in SECTION 8.12.

    "PBGC" means the Pension Benefit Guaranty Corporation established under
ERISA.

    "PSC" means the Montana Public Service Commission.

                                      B-40
<PAGE>
    "PERMITTED LIEN" means (i) any Lien for Taxes not yet due or delinquent or
being contested in good faith by appropriate proceedings for which adequate
reserves have been established in accordance with GAAP, (ii) any statutory Lien
arising in the ordinary course of business by operation of Law with respect to a
Liability that is not yet due or delinquent and (iii) any minor imperfection of
title or similar Lien which individually or in the aggregate with other such
Liens could not reasonably be expected to materially adversely affect the
Business or Condition of MPC and the Company.

    "PENSION BENEFIT PLAN" means each Benefit Plan which is a pension benefit
plan within the meaning of Section 3(2) of ERISA.

    "PERSON" means any natural person, corporation, limited liability company,
general partnership, limited partnership, proprietorship, other business
organization, trust, union, association or Governmental or Regulatory Authority.

    "PILKO ENVIRONMENTAL REPORTS" means the reports prepared by Pilko &
Associates, Inc. for MPC, titled as follows: "Environmental Assessment of
Montana Power's Utility Business" (including Attachments A and B thereto) dated
June, 2000; "Phase II Investigation Colstrip Project" dated August, 1998; "Phase
II Investigation Corette Project" dated August, 1998; "Phase II Investigation
Hydroelectric Project Portfolio (except Milltown)" dated August, 1998; and
"Phase II Investigation Milltown Hydroelectric Project" dated August, 1998.

    "PLAN" means any bonus, incentive compensation, deferred compensation,
pension, profit sharing, retirement, stock purchase, stock option, stock
ownership, stock appreciation rights, phantom stock, leave of absence, layoff,
vacation, day or dependent care, legal services, cafeteria, life, health,
accident, disability, workmen's compensation or other insurance, severance,
separation or other employee benefit plan, practice, policy or arrangement of
any kind, whether written or oral, including, but not limited to, any "employee
benefit plan" within the meaning of Section 3(3) of ERISA.

    "PROXY STATEMENT" has the meaning ascribed to it in SECTION 2.22.

    "PURCHASE PRICE" has the meaning ascribed to it in SECTION 1.02.

    "PURCHASER" has the meaning ascribed to it in the forepart of this
Agreement.

    "PURCHASER INDEMNITEES" has the meaning ascribed to it in SECTION 10.01.

    "QUALIFIED PLAN" means each Benefit Plan which is intended to qualify under
Section 401 of the Code.

    "QF" means Qualified Facilities as defined in the Public Utility Regulatory
Policies Act of 1978 and the regulations promulgated thereunder, specifically 18
CFR Part 292.

    "REGIONAL TRANSMISSION ORGANIZATION" means that not-for-profit corporation
incorporated in the State of Washington on April 27, 2000 in relation to the
creation of a regional transmission organization (having the characteristics and
functions set forth in FERC Order 2000) by and among Avista, the Bonneville
Power Authority, Idaho Power Company, MPC, Nevada Power Company, PacifiCorp,
Portland General Electric Company, Puget Sound Energy, Inc. and Sierra Pacific
Power Company and any other electric energy transmission system owners willing
to participate.

    "REPRESENTATIVES" has the meaning ascribed to it in SECTION 4.03.

    "RESOLUTION PERIOD" means the period ending thirty (30) days following
receipt by an Indemnified Party of a written notice from an Indemnifying Party
stating that it disputes all or any portion of a claim set forth in a Claim
Notice or an Indemnity Notice.

    "RESTRUCTURING" means the reorganization of the corporate structure of MPC
including, but not limited to, (i) the merger of Entech with and into Entech
LLC, a Montana limited liability company wholly owned by MPC, following which
Entech LLC shall be the survivor, (ii) the merger of MPC with

                                      B-41
<PAGE>
and into the Company, a Montana limited liability company wholly owned by
Seller, pursuant to which shareholders of MPC will receive capital stock of
Seller in exchange for capital stock of MPC, and following which the Company
shall be the survivor, and (iii) the distribution of the capital stock of Entech
LLC by the Company to Seller.

    "RIGHTS AGREEMENT" has the meaning ascribed to it in SECTION 2.27.

    "SEC" means the Securities and Exchange Commission or any successor entity
thereto.

    "SECURITIES ACT" means the Securities Act of 1933, as amended.

    "SELLER" has the meaning ascribed to it in the forepart of this Agreement.

    "SELLER INDEMNITEES" has the meaning ascribed to it in SECTION 10.01(b).

    "SUBJECT DEFINED BENEFIT PLAN" means each Defined Benefit Plan listed and
described in SECTION 2.13(a) OF THE DISCLOSURE SCHEDULE.

    "SUBSIDIARIES" means CMPL, DES, Colstrip Community Services Company, a
Montana corporation, Montana Power Services Company, a Montana corporation, and
One Call Locators, Ltd., a Montana corporation.

    "SUBSTITUTE STOCK OPTIONS" has the meaning ascribed to it in
SECTION 5.04(i).

    "SUPERIOR PROPOSAL" shall mean a bona fide written Acquisition Proposal
which the Board of Directors of MPC (prior to the Restructuring and prior to
Closing) or Seller (after the Restructuring but prior to Closing) concludes in
good faith after consultation with a financial advisor of nationally recognized
reputation, taking into account, all legal, financial, regulatory and other
aspects of the proposal and the Person making the proposal (including, but not
limited to, any break-up fees, expense reimbursement provisions and conditions
to consummation), (i) would, if consummated, result in a transaction that is
more favorable to all of the stockholders (in their capacities as stockholders)
of MPC (prior to the Restructuring) or Seller (after the Restructuring but prior
to Closing), from a financial point of view than the transactions contemplated
by this Agreement and (ii) is reasonably capable of being consummated; provided,
that for purposes of this definition, the term "Acquisition Proposal" shall have
the meaning set forth in SECTION 12.01 except that (x) the reference to "10%" in
the definition of "Acquisition Proposal" shall be deemed to be a reference to
"51%", (y) "Acquisition Proposal" shall only be deemed to refer to a transaction
involving, prior to the Restructuring MPC, and after the Restructuring, but
prior to Closing, Seller, and (z) the reference to "assets" shall refer to the
assets of, prior to the Restructuring, MPC and its subsidiaries taken as a
whole, and after the Restructuring but prior to Closing to Seller and its
subsidiaries, taken as a whole, and not the assets of any of the Subsidiaries
alone.

    "TAX RETURNS" means any return, declaration, report, claim for refund, or
information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.

    "TAXES" means any federal, state, local, or foreign income, gross receipts,
license, payroll, employment, excise, severance, stamp, occupation, premium,
windfall profits, environmental, customs duties, capital stock, franchise,
profits, withholding, social security, unemployment, disability, real property,
personal property, sales, use, transfer, registration, value added, alternative
or add-on minimum, estimated, or other tax of any kind whatsoever, including any
interest, penalty, or addition thereto, whether disputed or not.

    "THIRD PARTY CLAIM" has the meaning ascribed to it in SECTION 10.06(A).

                                      B-42
<PAGE>
    "TREAS REG." means the regulations (including any proposed or temporary
regulations) issued under the Code by the Department of Treasury as they may be
amended from time to time, or any applicable successor regulations.

    "UNITS" has the meaning ascribed to it in the recitals to this Agreement.

    "UTILITY BUSINESS" has the meaning ascribed to it in SECTION 2.28.

    "WHOLESALE TRANSMISSION SERVICES AGREEMENT" means the Wholesale Transmission
Services Agreement dated December 17, 1999, by and between MPC and PP&L Montana,
LLC.

    (b) CONSTRUCTION OF CERTAIN TERMS AND PHRASES. Unless the context of this
Agreement otherwise requires, (i) words of any gender include each other gender;
(ii) words using the singular or plural number also include the plural or
singular number, respectively; (iii) the terms "hereof," "herein," "hereby" and
derivative or similar words refer to this entire Agreement; (iv) the terms
"Article" or "Section" refer to the specified Article or Section of this
Agreement; and (v) the phrase "ordinary course of business" refers to the
business of the Company or a Subsidiary. Whenever this Agreement refers to a
number of days, such number shall refer to calendar days unless Business Days
are specified. All accounting terms used herein and not expressly defined herein
shall have the meanings given to them under GAAP. Any representation or warranty
contained herein as to the enforceability of a Contract shall be subject to the
effect of any bankruptcy, insolvency, reorganization, moratorium or other
similar law affecting the enforcement of creditors' rights generally and to
general equitable principles (regardless of whether such enforceability is
considered in a proceeding in equity or at Law).

                                  ARTICLE XIII
                                 MISCELLANEOUS

    13.01  NOTICES.  All notices, requests and other communications hereunder
must be in writing and will be deemed to have been duly given only if delivered
personally or by facsimile transmission or mailed (first class postage prepaid)
to the parties at the following addresses or facsimile numbers:

<TABLE>
<S>                                                           <C>
        If to Purchaser, to:

        NorthWestern Corporation
        125 South Dakota Avenue
        Sioux Falls, SD 57104-6403
        Facsimile No.: (605) 978-2910
        Attn: Eric R. Jacobsen
             Vice President, General Counsel

        with a copy to:

        Paul, Hastings, Janofsky, & Walker, LLP
        1299 Pennsylvania Avenue, N.W.
        Washington, D.C. 20004-2400
        Facsimile No.: (202) 508-9700
        Attn: Charles A. Patrizia

        If to Seller, to:

        Touch America Holdings, Inc.
        40 East Broadway Street
        Butte, Montana 59701-9394
        Facsimile No.: (406) 497-2451
        Attn: Vice President and General Counsel
</TABLE>

                                      B-43
<PAGE>
<TABLE>
<S>                                                           <C>
        If to MPC:

        40 East Broadway Street
        Butte, Montana 59701-9394
        Facsimile No.: (406) 497-2451
        Attn: Vice President and General Counsel

        , in each case with a copy to:

        Milbank, Tweed, Hadley & McCloy LLP
        One Chase Manhattan Plaza
        New York, NY 10005
        Facsimile No.: (212) 530-5219
        Attn: John T. O'Connor
</TABLE>

All such notices, requests and other communications will (i) if delivered
personally to the address as provided in this Section, be deemed given upon
delivery, (ii) if delivered by facsimile transmission to the facsimile number as
provided in this Section, be deemed given upon receipt, and (iii) if delivered
by mail in the manner described above to the address as provided in this
Section, be deemed given upon receipt (in each case regardless of whether such
notice, request or other communication is received by any other Person to whom a
copy of such notice, request or other communication is to be delivered pursuant
to this Section). Any party from time to time may change its address, facsimile
number or other information for the purpose of notices to that party by giving
notice specifying such change to the other party hereto.

    13.02  ENTIRE AGREEMENT.  This Agreement supersedes all prior discussions
and agreements between the parties with respect to the subject matter hereof,
including without limitation that certain confidentiality agreement between the
parties dated June 1, 2000, and contains the sole and entire agreement between
the parties hereto with respect to the subject matter hereof.

    13.03  EXPENSES.  Except as otherwise expressly provided in this Agreement
(including without limitation as provided in SECTIONS 11.02 and 11.03), whether
or not the transactions contemplated hereby are consummated, each party will pay
its own costs and expenses incurred in connection with the negotiation,
execution and closing of this Agreement and the transactions contemplated
hereby.

    13.04  PUBLIC ANNOUNCEMENTS.  At all times at or before the Closing, MPC,
Seller and Purchaser will not issue or make any reports, statements or releases
to the public or generally to the employees, customers, suppliers or other
Persons to whom MPC, the Company and the Subsidiaries sell goods or provide
services or with whom the Company and the Subsidiaries otherwise have
significant business relationships with respect to this Agreement or the
transactions contemplated hereby (including transition, integration and similar
plans) without the consent of the other, which consent shall not be unreasonably
withheld. If any party is unable to obtain the approval of its public report,
statement or release from the other party and such report, statement or release
is, in the opinion of legal counsel to such party, required by Law in order to
discharge such party's disclosure obligations, then such party may make or issue
the legally required report, statement or release and promptly furnish the other
party with a copy thereof. MPC, Seller and Purchaser will also obtain the other
party's prior approval which approval shall not be unreasonably withheld of any
press release to be issued immediately following the Closing announcing the
consummation of the transactions contemplated by this Agreement.

    13.05  CONFIDENTIALITY.  Each party hereto will hold, and will use its best
efforts to cause its Affiliates, and in the case of Purchaser, any Person who
has provided, or who is considering providing, financing to Purchaser to finance
all or any portion of the Purchase Price, and their respective Representatives
to hold, in strict confidence from any Person (other than any such Affiliate,
Person who has provided, or who is considering providing, financing or
Representative), unless (i) compelled

                                      B-44
<PAGE>
to disclose by judicial or administrative process (including without limitation
in connection with obtaining the necessary approvals of this Agreement and the
transactions contemplated hereby of Governmental or Regulatory Authorities) or
by other requirements of Law or (ii) disclosed in an Action or Proceeding
brought by a party hereto in pursuit of its rights or in the exercise of its
remedies hereunder, all documents and information concerning the other party or
any of its Affiliates furnished to it by the other party or such other party's
Representatives in connection with this Agreement or the transactions
contemplated hereby, except to the extent that such documents or information can
be shown to have been (a) previously known by the party receiving such documents
or information, (b) in the public domain (either prior to or after the
furnishing of such documents or information hereunder) through no fault of such
receiving party or (c) later acquired by the receiving party from another source
if the receiving party is not aware that such source is under an obligation to
another party hereto to keep such documents and information confidential;
provided that following the Closing the foregoing restrictions will not apply to
Purchaser's use of documents and information concerning MPC, the Company and the
Subsidiaries furnished by Seller and MPC hereunder. In the event the
transactions contemplated hereby are not consummated, upon the request of the
other party, each party hereto will, and will cause its Affiliates, any Person
who has provided, or who is providing, financing to such party and their
respective Representatives to, promptly (and in no event later than five
(5) Business Days after such request) redeliver or cause to be redelivered all
copies of confidential documents and information furnished by the other party in
connection with this Agreement or the transactions contemplated hereby and
destroy or cause to be destroyed all notes, memoranda, summaries, analyses,
compilations and other writings related thereto or based thereon prepared by the
party which furnished such documents and information or its Representatives.

    13.06  WAIVER.  Any term or condition of this Agreement may be waived at any
time by the party that is entitled to the benefit thereof, but no such waiver
shall be effective unless set forth in a written instrument duly executed by or
on behalf of the party waiving such term or condition. No waiver by any party of
any term or condition of this Agreement, in any one or more instances, shall be
deemed to be or construed as a waiver of the same or any other term or condition
of this Agreement on any future occasion. All remedies, either under this
Agreement or by Law or otherwise afforded, will be cumulative and not
alternative.

    13.07  AMENDMENT.  This Agreement may be amended, supplemented or modified
only by a written instrument duly executed by or on behalf of each party hereto.

    13.08  NO THIRD PARTY BENEFICIARY.  The terms and provisions of this
Agreement are intended solely for the benefit of each party hereto and their
respective successors or permitted assigns, and it is not the intention of the
parties to confer third-party beneficiary rights upon any other Person.

    13.09  NO ASSIGNMENT; BINDING EFFECT.  Neither this 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 will be
void, except (a) for assignments and transfers by operation of Law and (b) that
Purchaser may assign any or all of its rights, interests and obligations
hereunder to a wholly-owned subsidiary, provided that any such subsidiary agrees
in writing to be bound by all of the terms, conditions and provisions contained
herein, but no such assignment referred to in clause (b) shall relieve Purchaser
of its obligations hereunder. Subject to the preceding sentence, this Agreement
is binding upon, inures to the benefit of and is enforceable by the parties
hereto and their respective successors and assigns.

    13.10  HEADINGS.  The headings used in this Agreement have been inserted for
convenience of reference only and do not define or limit the provisions hereof.

    13.11  INVALID PROVISIONS.  If any provision of this Agreement is held to be
illegal, invalid or unenforceable under any present or future Law, and if the
rights or obligations of any party hereto under this Agreement will not be
materially and adversely affected thereby, (a) such provision will be

                                      B-45
<PAGE>
fully severable, (b) this Agreement will be construed and enforced as if such
illegal, invalid or unenforceable provision had never comprised a part hereof,
and (c) the remaining provisions of this Agreement will remain in full force and
effect and will not be affected by the illegal, invalid or unenforceable
provision or by its severance herefrom.

    13.12  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the Laws of the State of New York applicable to a Contract
executed and performed in such State.

    13.13  COUNTERPARTS.  This 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.

    13.14  INSURANCE COVERAGE AFTER CLOSING.  The parties hereto agree and
acknowledge that, except as disclosed in SECTION 13.14 OF THE DISCLOSURE
SCHEDULE, each insurance policy listed in SECTION 2.18 OF THE DISCLOSURE
SCHEDULE maintained by Seller and its Affiliates (including MPC, the Company and
the Subsidiaries) shall be available to or cover MPC, the Company and the
Subsidiaries or their respective assets, properties, operations and liabilities
after the Closing Date, and all benefits and coverage under each such insurance
policy shall continue following the Closing Date.

                                      B-46
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed and delivered by
the duly authorized officer of each party hereto as of the date first above
written.

<TABLE>
<S>                                                    <C>  <C>
                                                       NORTHWESTERN CORPORATION

                                                       By:  /s/ ERIC R. JACOBSEN
                                                            -----------------------------------------
                                                            Name: Eric R. Jacobsen
                                                            Title: Vice President, General Counsel

                                                       TOUCH AMERICA HOLDINGS, INC.

                                                       By:  /s/ J.P. PEDERSON
                                                            -----------------------------------------
                                                            Name: J.P. Pederson
                                                            Title: Vice President & Chief Financial
                                                            Officer

                                                       THE MONTANA POWER COMPANY

                                                       By:  /s/ J.P. PEDERSON
                                                            -----------------------------------------
                                                            Name: J.P. Pederson
                                                            Title: Vice President & Chief Financial
                                                            Officer
</TABLE>

                                      B-47
<PAGE>
                                                                         ANNEX C

                        MONTANA BUSINESS CORPORATION ACT
                       SECTIONS 35-1-826 THROUGH 35-1-839

35-1-826 Definitions.

    As used in 35-1-826 through 35-1-839, the following definitions apply:

    (1) "Beneficial shareholder" means the person who is a beneficial owner of
shares held in a voting trust or by a nominee as the record shareholder.

    (2) "Corporation" includes the issuer of the shares held by a dissenter
before the corporate action, or the surviving or acquiring corporation by merger
or share exchange of that issuer.

    (3) "Dissenter" means a shareholder who is entitled to dissent from
corporate action under 35-1-827 and who exercises that right when and in the
manner required by 35-1-829 through 35-1-837.

    (4) "Fair value", with respect to a dissenter's shares, means the value of
the shares immediately before the effectuation of the corporate action to which
the dissenter objects, excluding any appreciation or depreciation in
anticipation of the corporate action unless exclusion would be inequitable.

    (5) "Interest" means interest from the effective date of the corporate
action until the date of payment at the average rate currently paid by the
corporation on its principal bank loans or, if the corporation has no loans, at
a rate that is fair and equitable under all the circumstances.

    (6) "Record shareholder" means the person in whose name shares are
registered in the records of a corporation or the beneficial shareholder to the
extent of the rights granted by a nominee certificate on file with a
corporation.

    (7) "Shareholder" means the record shareholder or the beneficial
shareholder.

35-1-827 Right to dissent.

    (1) A shareholder is entitled to dissent from and obtain payment of the fair
value of the shareholder's shares in the event of any of the following corporate
actions:

        (a) consummation of a plan of merger to which the corporation is a party
    if:

           (i) shareholder approval is required for the merger by 35-1-815 or
       the articles of incorporation and the shareholder is entitled to vote on
       the merger; or

           (ii) the corporation is a subsidiary that is merged with its parent
       corporation under 35-1-818;

        (b) consummation of a plan of share exchange to which the corporation is
    a party as the corporation whose shares will be acquired if the shareholder
    is entitled to vote on the plan;

        (c) consummation of a sale or exchange of all or substantially all of
    the property of the corporation other than in the usual and regular course
    of business if the shareholder is entitled to vote on the sale or exchange,
    including a sale in dissolution but not including a sale pursuant to court
    order or a sale for cash pursuant to a plan by which all or substantially
    all of the net proceeds of the sale will be distributed to the shareholders
    within 1 year after the date of sale;

        (d) an amendment of the articles of incorporation that materially and
    adversely affects rights in respect of a dissenter's shares because it:

           (i) alters or abolishes a preferential right of the shares;

                                      C-1
<PAGE>
           (ii) creates, alters, or abolishes a right in respect of redemption,
       including a provision with respect to a sinking fund for the redemption
       or repurchase of the shares;

          (iii) alters or abolishes a preemptive right of the holder of the
       shares to acquire shares or other securities;

35-1-828 Dissent by nominees and beneficial owners.

    (1) A record shareholder may assert dissenters' rights as to fewer than all
the shares registered in his name only if he dissents with respect to all shares
beneficially owned by any one person and notifies the corporation in writing of
the name and address of each person on whose behalf he asserts dissenters'
rights. The rights of a partial dissenter under this subsection are determined
as if the shares as to which he dissents and his other shares were registered in
the names of different shareholders.

    (2) A beneficial shareholder may assert dissenters' rights as to shares held
on his behalf only if:

        (a) he submits to the corporation the record shareholder's written
    consent to the dissent not later than the time the beneficial shareholder
    asserts dissenters' rights; and

        (b) he does so with respect to all shares of which he is the beneficial
    shareholder or over which he has power to direct the vote.

35-1-829 Notice of dissenters' rights.

    (1) If a proposed corporate action creating dissenters' rights under
35-1-827 is submitted to a vote at a shareholders' meeting, the meeting notice
must state that shareholders are or may be entitled to assert dissenters' rights
under 35-1-826 through 35-1-839 and must be accompanied by a copy of 35-1-826
through 35-1-839.

    (2) If a corporate action creating dissenters' rights under 35-1-827 is
taken without a vote of shareholders, the corporation shall give written
notification to all shareholders entitled to assert dissenters' rights that the
action was taken and shall send them the dissenters' notice described in
35-1-831.

35-1-830 Notice of intent to demand payment.

    (1) If proposed corporate action creating dissenters' rights under 35-1-827
is submitted to a vote at a shareholders' meeting, a shareholder who wishes to
assert dissenters' rights:

        (a) shall deliver to the corporation before the vote is taken written
    notice of his intent to demand payment for his shares if the proposed action
    is effectuated; and

        (b) may not vote his shares in favor of the proposed action.

    (2) A shareholder who does not satisfy the requirements of subsection (1)(a)
is not entitled to payment for his shares under 35-1-826 through 35-1-839.

35-1-831. Dissenters' notice.

    (1) If proposed corporate action creating dissenters' rights under 35-1-827
is authorized at a shareholders' meeting, the corporation shall deliver a
written dissenters' notice to all shareholders who satisfied the requirements of
35-1-830.

    (2) The dissenters' notice must be sent no later than 10 days after the
corporate action was taken and must:

        (a) state where the payment demand must be sent and where and when
    certificates for certified shares must be deposited;

                                      C-2
<PAGE>
        (b) inform shareholders of uncertificated shares to what extent transfer
    of the shares will be restricted after the payment is received;

        (c) supply a form for demanding payment that includes the date of the
    first announcement to news media or to shareholders of the terms of the
    proposed corporate action and that requires the person asserting dissenters'
    rights to certify whether or not he acquired beneficial ownership of the
    share before the date;

        (d) set a date by which the corporation must receive the payment demand,
    which may not be fewer than 30 nor more than 60 days after the date the
    required notice under subsection (1) is delivered; and

        (e) be accompanied by a copy of 35-1-826 through 35-1-839.

35-1-832 Duty to demand payment.

    (1) A shareholder sent a dissenters' notice described in 35-1-831 shall
demand payment, certify whether the shareholder acquired beneficial ownership of
the shares before the date required to be set forth in the dissenters' notice
pursuant to 35-1-831(2)(c), and deposit his certificates in accordance with the
terms of the notice.

    (2) The shareholder who demands payment and deposits his certificates under
subsection (1) retains all other rights of a shareholder until these rights are
canceled or modified by the taking of the proposed corporate action.

    (3) A shareholder who does not demand payment or deposit his certificates
where required, each by the date set in the dissenters' notice, is not entitled
to payment for his shares under 35-1-826 through 35-1-839.

35-1-833 Share restrictions.

    (1) The corporation may restrict the transfer of uncertificated shares from
the date of the demand for their payment is received until the proposed
corporate action is taken or the restrictions are released under 35-1-835.

    (2) The person for whom dissenters' rights are asserted as to uncertificated
shares retains all other rights of a shareholder until these rights are canceled
or modified by the taking of the proposed corporate action.

35-1-834 Payment.

    (1) Except as provided in 35-1-836, as soon as the proposed corporate action
is taken or upon receipt of a payment demand, the corporation shall pay each
dissenter who complied with 35-1-832 the amount the corporation estimates to be
the fair value of the dissenter's shares plus accrued interest.

    (2) The payment must be accompanied by:

        (a) the corporation's balance sheet as of the end of a fiscal year
    ending not more than 16 months before the date of payment, an income
    statement for that year, a statement of changes in shareholders' equity for
    that year, and the latest available interim financial statements, if any;

        (b) a statement of the corporation's estimate of the fair value of the
    shares;

        (c) an explanation of how the interest was calculated;

        (d) a statement of the dissenter's right to demand payment under
    35-1-837; and

        (e) a copy of 35-1-826 through 35-1-839.

                                      C-3
<PAGE>
35-1-835 Failure to take action.

    (1) If the corporation does not take the proposed action within 60 days
after the date set for demanding payment and depositing certificates, the
corporation shall return the deposited certificates and release the transfer
restrictions imposed on uncertificated shares.

    (2) If after returning deposited certificates and releasing transfer
restrictions, the corporation takes the proposed action, it shall send a new
dissenters' notice under 35-1-831 and repeat the payment demand procedure.

35-1-836 After-acquired shares.

    (1) A corporation may elect to withhold payment required by 35-1-834 from a
dissenter unless the dissenter was the beneficial owner of the shares before the
date set forth in the dissenters' notice as the date of the first announcement
to news media or to shareholders of the terms of the proposed corporate action.

    (2) To the extent the corporation elects to withhold payment under
subsection (1), after taking the proposed corporate action, the corporation
shall estimate the fair value of the shares plus accrued interest and shall pay
this amount to each dissenter who agrees to accept it in full satisfaction of
his demand. The corporation shall send with its offer a statement of its
estimate of the fair value of the shares, and explanation of how the interest
was calculated, and a statement of the dissenter's right to demand payment under
35-1-837.

35-1-837 Procedure if shareholder dissatisfied with payment or offer.

    (1) A dissenter may notify the corporation in writing of the dissenter's own
estimate of the fair value of the dissenter's shares and the amount of interest
due and may demand payment of the dissenter's estimate, less any payment under
35-1-834, or reject the corporation's offer under 35-1-836 and demand payment of
the fair value of the dissenter's shares and the interest due if"

        (a) the dissenter believes that the amount paid under 35-1-834 or
    offered under 35-1-836 is less than the fair value of the dissenter's shares
    or that the interest due in incorrectly calculated;

        (b) the corporation fails to make payment under 35-1-834 within 60 days
    after the date set for demanding payment; or

        (c) the corporation, having failed to take the proposed action, does not
    return the deposited certificates or release the transfer restrictions
    imposed on uncertificated shares within 60 days after the date set for
    demanding payment.

    (2) A dissenter waives the right to demand payment under this section unless
he notifies the corporation of his demand in writing under subsection
(1) within 30 days after the corporation made or offered payment for his shares.

35-1-838 Court action.

    (1) If a demand for payment under 35-1-837 remains unsettled, the
corporation shall commence a proceeding with 60 days after receiving the payment
demand and shall petition the court to determine the fair value of the shares
and accrued interest. If the corporation does not commence the proceeding within
the 60-day period, it shall pay each dissenter whose demand remains unsettled
the amount demanded.

    (2) The corporation shall commence the proceeding in the district court of
the county where the corporation's principal office or, if its principal office
is not located in the state, where its registered office located. If the
corporation is a foreign corporation without a registered office in this state,
it

                                      C-4
<PAGE>
shall commence the proceeding in the county in this state where the registered
office of the domestic corporation merged with or whose shares were acquired by
the foreign corporation was located.

    (3) The corporation shall make all dissenters whose demands remain
unsettled, whether or not residents of this state, parties to the proceeding as
in an action against their shares, and all parties must be served by certified
mail or by publication as provided by law.

    (4) The jurisdiction of the district court in which the proceeding is
commenced under subsection (2) is plenary and exclusive. The court may appoint
one or more persons as appraisers to receive evidence and recommend decision on
the question of fair value. The appraisers have the powers described in the
order appointing them or in any amendment to it. The dissenters are entitled to
the same discovery rights as parties in other civil proceedings.

    (5) Each dissenter made a party to the proceeding is entitled to judgment:

        (a) for the amount, if any, by which the court finds the fair value of
    the dissenter's shares plus interest exceeds the amount paid by the
    corporation; or

        (b) for the fair value plus accrued interest of his after-acquired
    shares for which the corporation elected to withhold payment under 35-1-836.

35-1-839 Court costs and attorney fees.

    (1) The court in an appraisal proceeding commenced under 35-1-838 shall
determine all costs of the proceeding, including the reasonable compensation and
expenses of appraisers appointed by the court. The court shall assess the costs
against the corporation, except that the court may assess costs against all or
some of the dissenters, in amounts the court finds equitable, to the extent the
court finds dissenters acted arbitrarily, vexatiously, or not in good faith in
demanding payment under 35-1-837.

    (2) The court may also assess the fees and expenses of counsel and experts
for the respective parties, in amounts the court finds equitable:

        (a) against the corporation and in favor of any or all dissenters if the
    court finds the corporation did not substantially comply with the
    requirements of 35-1-829 through 35-1-837; or

        (b) against either the corporation or a dissenter, in favor of any other
    party, if the court finds that the party against whom the fees and expenses
    are assessed acted arbitrarily, vexatiously, or not in good faith with
    respect to the rights provided by 35-1-826 through 35-1-839.

    (3) If the court finds that the services of counsel for any dissenter were
of substantial benefit to other dissenters similarly situated and that the fees
for those services should not be assessed against the corporation, the court may
award the counsel reasonable attorney fees to be paid out of the amounts awarded
the dissenters who were benefited.

                                      C-5
<PAGE>

[LOGO OF THE MONTANA POWER COMPANY]


                         PROXY VOTING INSTRUCTIONS

       THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS FOR

              THE SPECIAL MEETING OF SHAREHOLDERS ON [ ], 2001.




The undersigned hereby appoints R. P. Gannon, J. P. Pederson, and Michael E.
Zimmerman and each of them, with power of substitution, proxies to represent,
and to vote all stock of the undersigned at The Montana Power Company's
Special Meeting of Shareholders on [ ], 2001, and at any adjournments
thereof.  In their discretion, the proxies are authorized to vote upon such
other matters as may properly come before the meeting.  This proxy when
properly executed will be voted in the manner directed herein by the
undersigned shareholder.  If NO SPECIFICATION IS MADE, THIS PROXY WILL BE
VOTED "FOR" ITEMS 1, 2 AND 3.



      Your vote for the proposals may be indicated on the reverse side.



              THIS PROXY IS CONTINUED ON THE REVERSE SIDE.

          PLEASE SIGN ON THE REVERSE SIDE AND RETURN PROMPTLY.


The Special Meeting will be held at the Mother Lode Theatre, 316 W. Park,
Butte, Montana on [ ],  2001 at 1:30 p.m.

Please mark, sign, date and return the proxy card in the envelope
provided. If you do so now we will be saved the expense of follow up
solicitations. Please see back for directions.

<TABLE>
<S>                                             <C>
                                   VOTE BY TELEPHONE OR INTERNET
                                     QUICK***EASY***IMMEDIATE

   [GRAPHIC OF PHONE] VOTE BY TELEPHONE                           [GRAPHIC OF COMPUTER] VOTE BY INTERNET

It's fast and convenient and your vote is                   It's fast and convenient and your vote is posted immediately.
           posted immediately.                     In addition, you may elect to receive all future materials by internet.

     Just follow these four easy steps:                             Just follow these four easy steps:

1.   Have your proxy card in hand when you call.    1.   Have your proxy card in hand when you access our website.

2.   Using a touch-tone telephone, call our         2.   Go to the website:
      toll-free number 1-800-245-6767                     https://www.css2.sungard.com/Mtpower/InterLink(case sensitive)

3.   You will be prompted to enter the control      3.   You will be prompted to enter the proxy number, company
      number shown below.                                 number, and account number shown below.

4.   Follow the voting instructions to vote         4.   Follow the prompts to vote your shares.
      your shares.

</TABLE>

                                  VOTE BY MAIL


Mark, sign and date your proxy form below, detach it and return it in the
                        postage paid envelope provided.

IF YOU VOTE BY TELEPHONE OR INTERNET, DO NOT RETURN THIS VOTING INSTRUCTION
                          FORM. THANK YOU FOR YOUR VOTE!

--------------------------------------------------------------------------------
                           PLEASE DETACH AT PERFORATION

<PAGE>

/X/ PLEASE MARK VOTES AS
    IN THE EXAMPLE USING
    BLACK OR BLUE INK

THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" ITEMS 1, 2 AND 3.

<TABLE>
<S>                                                                                     <C>
1.      MERGER OF THE MONTANA POWER COMPANY                                              FOR       AGAINST     WITHHOLD
        WITH AND INTO THE  MONTANA POWER L.L.C.                                         /  /        /  /         /  /

        Approval of the agreement and plan of merger among The Montana
        Power Company, Touch America Holdings, Inc., a Delaware corporation
        and a wholly owned subsidiary of The Montana Power Company, and The
        Montana Power L.L.C., a Montana limited liability company and a
        wholly owned subsidiary of Touch America Holdings, the result of
        which is that holders of common shares of The Montana Power Company
        will receive one share of Touch America Holdings' common stock for
        each share of common stock of The Montana Power Company and the
        holders of shares of Preferred Stock, $6.875 Series of the Montana
        Power Company will receive one share of Touch America Holdings'
        Preferred Stock, $6.875 Series for each share of Preferred Stock,
        $6.875 Series of the Montana Power Company.

2.      SALE OF THE UTILITY BUSINESS TO NORTHWESTERN                                     FOR       AGAINST     WITHHOLD
                                                                                        /  /        /  /         /  /
        Approval of the sale of substantially all of the  assets of The
        Montana Power Company relating to its utility business as
        contemplated by the Unit Purchase Agreement between NorthWestern
        Corporation, The Montana Power Company, and Touch America Holdings,
        Inc., dated as of September 29, 2000.

3.      REDEMPTION OF PREFERRED  STOCK                                                    FOR       AGAINST     WITHHOLD
                                                                                         /  /        /  /         /  /
 Approval of the redemption of the Montana
 Power Company's outstanding Preferred Stock, $4.20
        Series and Preferred Stock, $6.00 Series.

</TABLE>


                 Dated: _____________________, 2001

        Please sign as your name appears hereon. When signing as attorney,
        executor, administrator, trustee or guardian, please give full title
        as such. If stock is registered in joint tenancy, all tenants must
        sign the proxy.


        __________________________________________
             Signature(s) of shareholder(s)


        __________________________________________
             Signature(s) of shareholder(s)


        __________________________________________
             Signature(s) of shareholder(s)



         ----------------------------------------------------------------
                                   IMPORTANT

                      PLEASE SUBMIT YOUR PROXY TODAY BY ONE OF
                             THE FOLLOWING METHODS:

TELEPHONE  [GRAPHIC OF       INTERNET [GRAPHIC OF]       MAIL  [GRAPHIC OF
            TELEPHONE]                  COMPUTER                 LETTERS]

                           IF YOU DO SO NOW, THE COMPANY
                       WILL BE SAVED THE EXPENSE OF FOLLOW UP
                                 SOLICITATIONS.

         ----------------------------------------------------------------
<PAGE>

[LOGO OF THE MONTANA POWER COMPANY]


                         PROXY VOTING INSTRUCTIONS

       THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS FOR

              THE SPECIAL MEETING OF SHAREHOLDERS ON [ ], 2001.




The undersigned hereby appoints R. P. Gannon, J. P. Pederson, and M. E.
Zimmerman and each of them, with power of substitution, proxies to represent,
and to vote all stock of the undersigned at The Montana Power Company's
Special Meeting of Shareholders on [ ], 2001, and at any adjournments
thereof.  In their discretion, the proxies are authorized to vote upon such
other matters as may properly come before the meeting.  This proxy when
properly executed will be voted in the manner directed herein by the
undersigned shareholder.  If NO SPECIFICATION IS MADE, THIS PROXY WILL BE
VOTED "FOR" ITEMS 1 AND 2.



      Your vote for the proposals may be indicated on the reverse side.



              THIS PROXY IS CONTINUED ON THE REVERSE SIDE.

          PLEASE SIGN ON THE REVERSE SIDE AND RETURN PROMPTLY.


The Special Meeting will be held at the Mother Lode Theatre, 316 W. Park,
Butte, Montana on [ ], 2001 at 1:30 p.m.

Please mark, sign, date and return the proxy card in the envelope provided.
If you do so now we will be saved the expense of follow up solicitations.
Please see back for directions.

<TABLE>
<S>                                             <C>
                                   VOTE BY TELEPHONE OR INTERNET
                                     QUICK***EASY***IMMEDIATE

   [GRAPHIC OF PHONE] VOTE BY TELEPHONE                           [GRAPHIC OF COMPUTER] VOTE BY INTERNET

It's fast and convenient and your vote is                   It's fast and convenient and your vote is posted immediately.
           posted immediately.                     In addition, you may elect to receive all future materials by internet.

     Just follow these four easy steps:                             Just follow these four easy steps:

1.   Have your proxy card in hand when you call.    1.   Have your proxy card in hand when you access our website.

2.   Using a touch-tone telephone, call our         2.   Go to the website:
      toll-free number 1-800-245-6767                     https://www.css2.sungard.com/Mtpower/InterLink(case sensitive)

3.   You will be prompted to enter the control      3.   You will be prompted to enter the proxy number, company
      number shown below.                                 number, and account number shown below.

4.   Follow the voting instructions to vote         4.   Follow the prompts to vote your shares.
      your shares.

</TABLE>

                                  VOTE BY MAIL


Mark, sign and date your proxy form below, detach it and return it in the
                        postage paid envelope provided.

IF YOU VOTE BY TELEPHONE OR INTERNET, DO NOT RETURN THIS VOTING INSTRUCTION
                          FORM. THANK YOU FOR YOUR VOTE!

--------------------------------------------------------------------------------
                           PLEASE DETACH AT PERFORATION

<PAGE>

                                  Preferred Stock
                    The proxy is instructed to vote as follows:

/X/ PLEASE MARK VOTES AS
    IN THE EXAMPLE USING
    BLACK OR BLUE INK

THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR" ITEMS 1 AND 2.

<TABLE>

<S>                                                                                      <C>       <C>         <C>
1.      MERGER OF THE MONTANA POWER COMPANY                                              FOR       AGAINST     WITHHOLD
        WITH AND INTO THE MONTANA POWER LLC                                             /  /        /  /         /  /

        Approval of the agreement and plan of merger among The
        Montana Power Company, Touch America Holdings, Inc., a Delaware
        corporation and a wholly owned subsidiary of The  Montana Power
        Company, and The Montana Power L.L.C., a Montana limited liability
        company and a wholly owned subsidiary of Touch America Holdings, the
        result of which is that holders of common shares of The Montana Power
        Company will receive one share of Touch America Holdings' common
        stock for each share of common stock of The Montana Power Company and
        the holders of shares of Preferred Stock, $6.875 Series of the
        Montana Power Company will receive one share of Touch America
        Holdings' Preferred Stock, $6.875 Series for each share of Preferred
        Stock, $6.875 Series of the Montana Power Company.

<CAPTION>

2.      SALE OF THE UTILITY BUSINESS TO NORTHWESTERN                                     FOR       AGAINST     WITHHOLD
<S>                                                                                      <C>       <C>         <C>
                                                                                        /  /        /  /       /  /
        Approval of the sale of substantially all of the  assets of The
        Montana Power Company relating to its utility business as
        contemplated by the Unit Purchase Agreement between  NorthWestern
        Corporation, The Montana Power Company, and Touch America Holdings,
        Inc., dated as of September 29, 2000.

</TABLE>


               Dated:   _____________________, 2001

        Please sign as your name appears hereon. When signing as attorney,
        executor, administrator, trustee or guardian, please give full title
        as such.  If stock is registered in joint tenancy, all tenants must
        sign the proxy.


        __________________________________________
             Signature(s) of shareholder(s)


        __________________________________________
             Signature(s) of shareholder(s)


        __________________________________________
             Signature(s) of shareholder(s)



         ----------------------------------------------------------------
                                   IMPORTANT

                      PLEASE SUBMIT YOUR PROXY TODAY BY ONE OF
                             THE FOLLOWING METHODS:

TELEPHONE  [GRAPHIC OF       INTERNET [GRAPHIC OF]       MAIL  [GRAPHIC OF
            TELEPHONE]                  COMPUTER                 LETTERS]

                        IF YOU DO SO NOW, THE COMPANY WILL
                        BE SAVED THE EXPENSE OF FOLLOW UP
                                 SOLICITATIONS.

         ----------------------------------------------------------------



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