SIERRA PACIFIC RESOURCES
8-K, 1998-04-30
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 8-K

                                CURRENT REPORT
                    PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


                                April 29, 1998
               ________________________________________________
               Date of Report (Date of Earliest Event Reported)


                           Sierra Pacific Resources
               ________________________________________________
              (Exact Name of Registrant as Specified in Charter)

          Nevada                      0-508                  88-0044418
- ---------------------------     -----------------   ----------------------------
(State or Other Jurisdiction    (Commission File             (IRS Employer
     of Incorporation)               Number)                 Identification No.)
 
                        P.O. Box 10100 (6100 Neil Road)
                              Reno, Nevada  89511
              ___________________________________________________
             (Address of Principal Executive Offices and Zip Code)

                                (702) 834-3600
              ___________________________________________________
             (Registrant's Telephone Number, Including Area Code)


                                      N/A
           ________________________________________________________
         (Former Name or Former Address, if Changed Since Last Report)
<PAGE>
 
Item 5.  Other Events.

     On April 29, 1998, Sierra Pacific Resources, a Nevada corporation (the 
"Company"), Nevada Power Company, a Nevada corporation ("Nevada Power"), LAKE
Merger Sub, Inc., a Nevada corporation and a wholly-owned subsidiary of the
Company ("LAKE Merger Sub"), and DESERT Merger Sub, Inc., a Nevada corporation
and a wholly-owned subsidiary of the Company ("DESERT Merger Sub"), entered into
an Agreement and Plan of Merger, dated as of April 29, 1998 (the "Merger
Agreement") providing for a merger of equals transaction among the Company,
Nevada Power, LAKE Merger Sub and DESERT Merger Sub. The Merger Agreement and
the press release issued in connection therewith are filed herewith as Exhibits
2.1 and 99.1, respectively, and are incorporated herein by reference. The
description of the Merger Agreement set forth herein does not purport to be
complete and is qualified in its entirety by the provisions of the Merger
Agreement.

     Pursuant to the Merger Agreement, (i) LAKE Merger Sub will merge with and
into the Company (the "First Merger"), with the Company being the surviving
corporation, and immediately thereafter, (ii) Nevada Power will merge with and
into DESERT Merger Sub (the "Second Merger" and, together with the First Merger,
the "Mergers"), with DESERT Merger Sub being the surviving corporation and
continuing as a wholly-owned subsidiary of the Company (the "Surviving
Corporation"). The Mergers, which were unanimously approved by the boards of
directors of each of the Company and Nevada Power, are expected to occur shortly
after all of the conditions to the consummation of the Mergers, including the
receipt of certain regulatory approvals, are met or waived. The regulatory
approval process is expected to take approximately twelve (12) months.

     Under the terms of the Merger Agreement, each outstanding share of the
Company's common stock, $1.00 par value per share, together with associated
purchase rights (the "Company Common Stock"), other than shares owned by the
Company or any subsidiary of the Company, will be converted into the right to
receive either $37.55 in cash (the "Company Cash Consideration") or 1.44 shares
of Company Common Stock (the "Company Stock Consideration" and, together with
the Company Cash Consideration, the "Company Merger Consideration"). Each
outstanding share of Nevada Power's common stock, par value $1.00 per share (the
"Nevada Power Common Stock"), other than shares owned by Nevada Power, any
subsidiary of Nevada Power, the Company or any subsidiary of the Company, will
be converted into the right to receive either $26.00 in cash (the "Nevada Power
Cash Consideration") or 1.00 shares of Company Common Stock (the "Nevada Power
Stock Consideration" and, together with the Nevada Power Cash Consideration, the
"Nevada Power Merger Consideration"). Each holder of shares of Company Common
Stock may elect to receive, in respect of

                                       2
<PAGE>
 
each such share, either the Company Cash Consideration or the Company Stock
Consideration, and each holder of shares of Nevada Power Common Stock may elect
to receive, in respect of each such share, either the Nevada Power Cash
Consideration or the Nevada Power Stock Consideration.  Holders who (i) own less
than 100 shares of Company Common Stock or Nevada Power Common Stock or (ii)
elect to receive the Company Stock Consideration or the Nevada Power Stock
Consideration in respect of less than 100 shares of Company Common Stock or
Nevada Power Common Stock, respectively (all such shares, the "Deminimis
Shares"), will be deemed to have elected to receive the Company Cash
Consideration or the Nevada Power Cash Consideration, respectively, except where
the value of the Company Stock Consideration or the Nevada Power Stock
Consideration exceeds 120% of the value of the Company Cash Consideration or
the Nevada Power Cash Consideration, respectively, at the time of the election
deadline.  The Mergers are expected to be tax-free to stockholders of the
Company and Nevada Power to the extent that they receive shares of Company
Common Stock, and any cash received is expected to be taxed as capital gain
except to the extent dividend treatment is elected.

     Pursuant to the Merger Agreement, approximately $151.6 million in cash will
be paid to holders of shares of Company Common Stock, and approximately $304.6
million in cash will be paid to holders of shares of Nevada Power Common Stock.
In the event that stockholders of the Company or Nevada Power fail to elect to
receive all of the cash allocated to be paid to them pursuant to the Mergers,
such cash will be proportionately allocated among those stockholders who have
elected to receive shares of Company Common Stock.  Likewise, in the event that
the stockholders of the Company or Nevada Power fail to elect to receive all of
the shares of Company Common Stock allocated to be paid to them pursuant to
the Mergers, such shares will be proportionately allocated among those
stockholders who have elected to receive cash, other than among the holders of
the Deminimis Shares who may receive cash in any event.  At the close of the
Mergers, stockholders of the Company and stockholders of Nevada Power will each
own approximately 50% of the Company Common Stock.

     The Board of Directors of the Company has received an opinion from its
investment banker, SG Barr Devlin, to the effect that, as of the date of the
Merger Agreement, the Company Merger Consideration to be issued in the First
Merger, in light of the Nevada Power Merger Consideration to be issued in the
Second Merger, is fair from a financial point of view to holders of Company
Common Stock.  The Board of Directors of the Company has also received the
opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated, to the effect
that, as of the date of the Merger Agreement, the aggregate consideration to be
received by holders of Company Common Stock pursuant to the transactions
contemplated by the Merger Agreement is fair from a financial point of view to
such holders.

                                       3
<PAGE>
 
     The Mergers are subject to certain customary closing conditions, including,
without limitation, the receipt of the required stockholder approvals of the
Company and Nevada Power and the receipt of all necessary governmental approvals
and the making of all necessary governmental filings, including the approval of
state utility regulators in Nevada, the approval of the Federal Energy
Regulatory Commission, and the filing of the requisite notification with the
Federal Trade Commission and the Department of Justice under the Hart-Scott-
Rodino Antitrust Improvements Act of 1976, as amended, and the expiration of the
applicable waiting period thereunder.  In addition, the Mergers are conditioned
upon the effectiveness of a registration statement to be filed with respect to
the Company Common Stock to be issued in the Mergers.  (See Article VIII of the
Merger Agreement.)  Stockholder meetings to vote upon the Mergers will be
convened as soon as practicable and are expected to be held in the third quarter
of 1998.

     The Merger Agreement contains certain covenants of the parties pending the
consummation of the Mergers.  Generally, the parties must carry on their
respective businesses in the ordinary course consistent with past practice and
use all commercially reasonable efforts to preserve intact their present
business organizations and goodwill, may not increase dividends on common stock
beyond specified levels, and may not issue any capital stock beyond certain
limits.  The Merger Agreement also contains certain restrictions and limitations
with respect to, among other things, charter and bylaw amendments, capital
expenditures, acquisitions, dispositions, incurrence of indebtedness, certain
increases in employee compensation and benefits, affiliate transactions, rate
matters, contracts and discharge of liabilities.  (See Article VI of the Merger
Agreement.)

     The Merger Agreement provides that, after the effectiveness of the Mergers
(the "Effective Time"), the corporate headquarters of the Company and the
principal executive offices of the gas and water business units will be located
in Reno, Nevada, and the headquarters of Sierra Pacific Power Company, a Nevada
corporation and a wholly-owned subsidiary of the Company ("Sierra Pacific
Power"), and the Surviving Corporation and the principal executive offices of
the electric business unit will be located in Las Vegas, Nevada.  The Company's
board of directors, which will be classified into three separate classes, will
consist of fourteen (14) directors, one-half of whom will be designated by the
Company and one-half of whom will be designated by Nevada Power.  Malyn K.
Malquist, the Company's current Chairman, President and Chief Executive Officer
(CEO), will serve as President and Chief Operating Officer (COO) of the Company
and President and CEO of Sierra Pacific Power and the Surviving Corporation.
Michael R. Niggli, Nevada Power's current President and COO, will serve as
Chairman and CEO of the Company and Chairman of each of the Company's
subsidiaries.

                                       4
<PAGE>
 
     The Merger Agreement may be terminated under certain circumstances,
including by mutual consent of the parties; by any party if the Mergers are not
consummated by October 29, 1999 (the "Initial Termination Date"), subject to an
automatic extension of six months if the requisite statutory approvals have not
yet been obtained by the Initial Termination Date; by any party if the requisite
stockholder approvals are not obtained; by a non-breaching party if there occurs
a material breach of any representation, warranty, covenant or agreement
contained in the Merger Agreement which is not cured within twenty (20) days; or
by either party, under certain circumstances, as a result of a third-party
business combination proposal which such party, pursuant to its directors'
fiduciary duties, is required to accept.

     The Merger Agreement provides that if there is a material breach (whether
or not willful) of any representation, warranty, covenant or agreement contained
in the Merger Agreement, then the non-breaching party is entitled to
reimbursement of its out-of-pocket expenses, not to exceed a total of $10
million (and in the event of a willful breach, the non-breaching party shall
also be entitled, in addition to its out-of-pocket expenses (which shall not be
limited to $10 million), to any remedy it may have at law or in equity). If at
the time of any breaching party's willful breach there is pending a business
combination proposal by a third party involving such breaching party that is not
rejected or withdrawn and which is consummated within two and one-half years of
the non-breaching party's termination, then the breaching party will pay to the
non-breaching party a termination fee of $52.5 million in cash (minus any
amounts as may have been previously paid by the breaching party as out-of-pocket
expenses). The Merger Agreement also requires that a termination fee of $52.5
million (minus any amounts as may have been previously paid as out-of-pocket
expenses) must be paid by one party (the "Payor") to the other if (i) the Merger
Agreement is terminated (x) upon the acceptance by the Payor of a third-party
business combination proposal, or upon the withdrawal or adverse modification by
the board of directors of the Payor of its approval or recommendation of the
Mergers to its stockholders, (y) following a failure of the stockholders of the
Payor to grant their approval to the Mergers or (z) as a result of the Payor's
material failure to convene a stockholder meeting and, subject to its board of
director's fiduciary duties, recommend the Mergers to its stockholders, and (ii)
at the time of such termination or, in the case of any termination following the
disapproval of the Payor's stockholders, prior to the meeting of the Payor's
stockholders, there shall have been a third-party business combination proposal
which shall not have been rejected by the Payor or withdrawn by such third
party, and (iii) within two and one-half years of any such termination described
in clause (i) above, the Payor becomes a subsidiary of such third party or
accepts a written offer to consummate or consummates a business combination
proposal with such third party. (See Article IX of the Merger Agreement.)

                                       5
<PAGE>


Item 7. Financial Statements, Pro Forma Financial Information and Exhibits.

     (c)  Exhibits.

      2.1 Agreement and Plan of Merger, dated as of April 29, 1998, by and among
          the Company, Nevada Power, LAKE Merger Sub and DESERT Merger Sub.

     99.1 Joint Press Release of the Company and Nevada Power issued April 30,
          1998.

                                       6
<PAGE>
 
                                   SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

Date: April 30, 1998
                                       SIERRA PACIFIC RESOURCES

                                       By:  /s/ William E. Peterson
                                           --------------------------
                                            William E. Peterson
                                            Senior Vice President and 
                                            Corporate Secretary

                                       7
<PAGE>
 
                                 Exhibit Index
                                 -------------

Exhibit   Description
- -------   -----------

 2.1      Agreement and Plan of Merger, dated as of April 29, 1998, by and among
          the Company, Nevada Power, LAKE Merger Sub and DESERT Merger Sub.

99.1      Joint Press Release of the Company and Nevada Power issued April 30,
          1998.

                                       8

<PAGE>
 
                                                                     EXHIBIT 2.1



                         AGREEMENT AND PLAN OF MERGER



                                 BY AND AMONG



                             NEVADA POWER COMPANY,

                           SIERRA PACIFIC RESOURCES,

                            DESERT MERGER SUB, INC.

                           AND LAKE MERGER SUB, INC.




                           DATED AS OF APRIL 29, 1998
<PAGE>
<TABLE> 
<CAPTION> 
 
                               TABLE OF CONTENTS
                                                                                             Page

                                   ARTICLE 1
                                  THE MERGERS
<S>            <C>                                                                             <C> 

Section 1.1    The Mergers...................................................................  1
Section 1.2    Effects of the Mergers........................................................  2
Section 1.3    Effective Time of the Mergers.................................................  2


                                   ARTICLE 2
                              TREATMENT OF SHARES

Section 2.1    Effect on the Capital Stock of Sierra Pacific of the First Merger.............  2
        (a)    Cancellation of Lake Merger Sub Shares........................................  2
        (b)    Cancellation of Sierra Pacific Treasury Stock and Sub-Owned Stock.............  3
        (c)    Conversion of Sierra Pacific Common Stock.....................................  3
        (d)    Allocation....................................................................  3
        (e)    Election......................................................................  3
        (f)    Allocation of Sierra Pacific Cash Election Shares.............................  4
        (g)    Allocation of Sierra Pacific Stock Election Shares............................  5
        (h)    No Allocation.................................................................  6
        (i)    Proration of Sierra Pacific Deminimis Shares..................................  6
        (j)    Computations..................................................................  6
        (k)    Cancellation of Shares........................................................  6
Section 2.2    Effect on the Capital Stock of Nevada Power of the Second Merger..............  6
        (a)    Conversion of Desert Merger Sub Shares........................................  6
        (b)    Cancellation of Nevada Power Treasury Stock and Sub-Owned Stock...............  6
        (c)    Conversion of Nevada Power Common Stock.......................................  7
        (d)    Allocation....................................................................  7
        (e)    Election......................................................................  7
        (f)    Allocation of Nevada Power Cash Election Shares...............................  8
        (g)    Allocation of Nevada Power Stock Election Shares..............................  9
        (h)    No Allocation.................................................................  9
        (i)    Proration of Nevada Power Deminimis Shares.................................... 10
        (j)    Computations.................................................................. 10
        (k)    Cancellation of Shares........................................................ 10
Section 2.3    Exchange of Certificates...................................................... 10
        (a)    Exchange Agent................................................................ 10
        (b)    Exchange Procedures........................................................... 10
        (c)    Distributions with Respect to Unexchanged Shares.............................. 13
        (d)    No Further Ownership Rights in Shares......................................... 13
        (e)    No Fractional Shares.......................................................... 13
        (f)    Termination of Exchange Fund.................................................. 14
        (g)    No Liability.................................................................. 14
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>             <C>                                                               <C>
        (h)     Investment of Exchange Fund...................................    14
        (i)     Lost Certificates.............................................    14
        (j)     Determination of Proper Elections.............................    15
Section 2.4     Certain Adjustments...........................................    15

                                   ARTICLE 3
                                  THE CLOSING
Section 3.1     Closing.......................................................    15

                                   ARTICLE 4
     REPRESENTATIONS AND WARRANTIES OF EACH OF SIERRA PACIFIC, LAKE MERGER
                           SUB AND DESERT MERGER SUB

Section 4.1     Organization and Qualification................................    16
Section 4.2     Subsidiaries..................................................    16
Section 4.3     Capitalization................................................    17
Section 4.4     Authority; Non-Contravention; Statutory Approvals; Compliance.    18
        (a)     Authority.....................................................    18
        (b)     Non-Contravention.............................................    18
        (c)     Statutory Approvals...........................................    18
        (d)     Compliance....................................................    19
Section 4.5     Reports and Financial Statements..............................    19
Section 4.6     Absence of Certain Changes or Events; Absence of Undisclosed
                Liabilities...................................................    20
Section 4.7     Litigation....................................................    20
Section 4.8     Registration Statement and Proxy Statement....................    21
Section 4.9     Tax Matters...................................................    21
        (a)     Filing of Timely Tax Returns..................................    21
        (b)     Payment of Taxes..............................................    21
        (c)     Tax Liens.....................................................    22
        (d)     Withholding Taxes.............................................    22
        (e)     Extensions of Time for Filing Tax Returns.....................    22
        (f)     Waivers of Statute of Limitations.............................    22
        (g)     Expiration of Statute of Limitations..........................    22
        (h)     Audit, Administrative and Court Proceedings...................    22
        (i)     Powers of Attorney............................................    22
        (j)     Tax Rulings...................................................    22
        (k)     Availability of Tax Returns...................................    23
        (l)     Tax Sharing Agreements........................................    23
        (m)     Code (S) 341(f)...............................................    23
        (n)     Code (S) 168..................................................    23
        (o)     Code (S) 481 Adjustments......................................    23
        (p)     Code (S)(S) 6661 and 6662.....................................    23
        (q)     Code (S) 280G.................................................    23
        (r)     Liability for Others..........................................    23
Section 4.10    Employee Matters:  ERISA......................................    24
</TABLE>
                                      ii
<PAGE>

<TABLE>
<S>           <C>                                                           <C>
        (a)   Benefit Plans...............................................  24
        (b)   Contributions...............................................  24
        (c)   Qualification: Compliance...................................  24
        (d)   Liabilities.................................................  24
        (e)   Welfare Plans...............................................  25
        (f)   Documents Made Available....................................  25
        (g)   Payments Resulting from Merger..............................  25
        (h)   Funded Status of Plans......................................  25
        (i)   Certain Other Obligations...................................  25
        (j)   Modification or Termination of Plans........................  25
        (k)   Labor Agreements............................................  26
Section 4.11  Environmental Protection....................................  27
        (a)   Compliance..................................................  27
        (b)   Environmental Permits.......................................  27
        (c)   Environmental Claims........................................  27
        (d)   Releases....................................................  27
        (e)   Predecessors................................................  27
        (f)   Disclosure..................................................  28
Section 4.12  Regulation as a Utility.....................................  29
Section 4.13  Vote Required...............................................  29
Section 4.14  Non-applicability of Certain Nevada Law.....................  29
Section 4.15  Opinion of Financial Advisor................................  29
Section 4.16  Insurance...................................................  30
Section 4.17  Ownership of Nevada Power Common Stock......................  30
Section 4.18  Sierra Pacific Rights Agreement.............................  30
              
                                        ARTICLE 5
                        REPRESENTATIONS AND WARRANTIES OF NEVADA POWER
              
Section 5.1   Organization and Qualification..............................  30
Section 5.2   Subsidiaries................................................  31
Section 5.3   Capitalization..............................................  31
Section 5.4   Authority; Non-Contravention; Statutory.....................  32
              Approvals; Compliance
        (a)   Authority...................................................  32
        (b)   Non-Contravention............................................ 32
        (c)   Statutory Approvals.......................................... 32
        (d)   Compliance................................................... 33
Section 5.5   Reports and Financial Statements............................. 33
Section 5.6   Absence of Certain Changes or Events; Absence of
              Undisclosed Liabilities...................................... 34
Section 5.7   Litigation................................................... 34
Section 5.8   Registration Statement and Proxy Statement................... 34
Section 5.9   Tax Matters.................................................. 35
        (a)   Filing of Timely Tax Returns................................. 35
        (b)   Payment of Taxes............................................. 35
        (c)   Tax Liens.................................................... 35
</TABLE>

                                      iii
<PAGE>
 
<TABLE>
<S>           <C>                                                            <C>
     (d)      Withholding Taxes ............................................  35
     (e)      Extensions of Time for Filing Tax Returns ....................  35
     (f)      Waivers of Statute of Limitations ............................  35
     (g)      Expiration of Statute of Limitations .........................  35
     (h)      Audit, Administrative and Court Proceedings ..................  35
     (i)      Power of Attorney ............................................  36
     (j)      Tax Rulings ..................................................  36
     (k)      Availability of Tax Returns ..................................  36
     (l)      Tax Sharing Agreements .......................................  36
     (m)      Code (S) 341(f) ..............................................  36
     (n)      Code (S) 168 .................................................  36
     (o)      Code (S) 481 Adjustments .....................................  36
     (p)      Code (S) 6661 and (S) 6662 ...................................  36
     (q)      Code (S) 280G ................................................  37
     (r)      Liability for Others .........................................  37
Section 5.10  Employee Matters; ERISA ......................................  37
     (a)      Benefit Plans ................................................  37
     (b)      Contributions ................................................  37
     (c)      Qualification; Compliance ....................................  37
     (d)      Liabilities ..................................................  38
     (e)      Welfare Plans ................................................  38
     (f)      Documents Made Available .....................................  38
     (g)      Payments Resulting from Merger ...............................  38
     (h)      Funded Status of Plans .......................................  38
     (i)      Certain Other Obligations ....................................  39
     (j)      Modification or Termination of Plans .........................  39
     (k)      Labor Agreements .............................................  39
Section 5.11  Environmental Protection .....................................  40
     (a)      Compliance ...................................................  40
     (b)      Environmental Permits ........................................  40
     (c)      Environmental Claims .........................................  40
     (d)      Releases .....................................................  40
     (e)      Predecessors .................................................  41
     (f)      Disclosure ...................................................  41
Section 5.12  Regulation as a Utility ......................................  41
Section 5.13  Vote Required ................................................  41
Section 5.14  Non-applicability of Certain Nevada Law ......................  41
Section 5.15  Opinion of Financial Advisor .................................  41
Section 5.16  Insurance ....................................................  42
Section 5.17  Ownership of Sierra Pacific Common Stock .....................  42
Section 5.18  Nevada Power Rights Agreement ................................  42


                                   ARTICLE 6
                    CONDUCT OF BUSINESS PENDING THE MERGER

Section 6.1   Covenants of The Parties .....................................  42

</TABLE>


                                      iv

<PAGE>
 
<TABLE>
<S>           <C>                                                            <C>
     (a)      Ordinary Course of Business ..................................  42
     (b)      Dividends ....................................................  43
     (c)      Issuance of Securities .......................................  43
     (d)      Charter Documents ............................................  44
     (e)      No Acquisitions ..............................................  44
     (f)      Capital Expenditures: Additional Facilities, Etc. ............  44
     (g)      No Dispositions ..............................................  44
     (h)      Indebtedness .................................................  45
     (i)      Compensation, Benefits .......................................  45
     (j)      1935 Act .....................................................  46
     (k)      Accounting ...................................................  46
     (l)      Tax-Free Status ..............................................  46
     (m)      Affiliate Transactions .......................................  46
     (n)      Cooperation, Notification ....................................  46
     (o)      Rate Matters .................................................  46
     (p)      Third-Party Consents .........................................  47
     (q)      No Breach, Etc. ..............................................  47
     (r)      Tax-Exempt Status ............................................  47
     (s)      Contracts ....................................................  47
     (t)      Discharge of Liabilities .....................................  47


                                   ARTICLE 7
                             ADDITIONAL AGREEMENTS

Section 7.1   Access to Information ........................................  48
Section 7.2   Joint Proxy Statement and Registration Statement .............  48
     (a)      Preparation and Filing .......................................  48
     (b)      Amendments and Supplements ...................................  48
     (c)      Letter of Sierra Pacific's Accountants .......................  49
     (d)      Letter of Nevada Power's Accountants .........................  49
     (e)      Fairness Opinions ............................................  49
Section 7.3   Regulatory Matters ...........................................  49
     (a)      HSR Filings ..................................................  49
     (b)      Other Regulatory Approvals ...................................  49
Section 7.4   Shareholder Approval .........................................  50
     (a)      Approval of Nevada Power Stockholders ........................  50
     (b)      Approval of Sierra Pacific Stockholders ......................  50
     (c)      Meeting Date .................................................  50
     (d)      Fairness Opinions Not Withdrawn...............................  50
Section 7.5   Directors' and Officers' Indemnification .....................  50
     (a)      Indemnification ..............................................  50
     (b)      Insurance ....................................................  51
     (c)      Successors ...................................................  51
     (d)      Survival of Indemnification ..................................  52
     (e)      Benefit ......................................................  52
Section 7.6   Disclosure Schedules .........................................  52
Section 7.7   Public Announcements .........................................  52

</TABLE>


                                       v

<PAGE>
 
<TABLE>
<S>           <C>                                                            <C>
Section 7.8   Rule 145 Affiliates ..........................................  52
Section 7.9   Employee Agreements and Workforce Matters ....................  53
     (a)      Certain Employee Agreements ..................................  53
     (b)      Workforce Matters ............................................  53
Section 7.10  Employee Benefit Plans .......................................  53
Section 7.11  Incentive, Stock and Other Plans .............................  54
     (a)      Sierra Pacific Action ........................................  54
     (b)      Dividend Reinvestment Plans ..................................  54
Section 7.12  No Solicitations .............................................  55
Section 7.13  Sierra Pacific Board of Directors ............................  56
Section 7.14  Officers .....................................................  56
Section 7.15  Employment Contracts .........................................  56
Section 7.16  Corporate Offices ............................................  56
Section 7.17  Transition Management ........................................  56
Section 7.18  Expenses .....................................................  57
Section 7.19  Covenant to Satisfy Conditions ...............................  57


                                   ARTICLE 8
                                  CONDITIONS

Section 8.1   Conditions to Each Party's Obligations to Effect the Mergers .  57
     (a)      Shareholder Approvals ........................................  57
     (b)      No Injunction ................................................  57
     (c)      Registration Statement .......................................  58
     (d)      Listing of Shares ............................................  58
     (e)      Statutory Approvals ..........................................  58
Section 8.2   Conditions to Obligations of Sierra Pacific, Lake Merger
                Sub and Desert Merger Sub to Effect the Mergers ............  58
     (a)      Performance of Obligations of Nevada Power ...................  58
     (b)      Representations and Warranties ...............................  58
     (c)      Closing Certificates .........................................  58
     (d)      Nevada Power Material Adverse Effect .........................  58
     (e)      Tax Opinion ..................................................  59
     (f)      Nevada Power Required Consents ...............................  59
     (g)      Trigger of Nevada Power Rights ...............................  59
     (h)      Cancellation of Nevada Power Preferred Stock .................  59
Section 8.3   Conditions to Obligations of Nevada Power to Effect the
                Mergers ....................................................  59
     (a)      Performance of Obligations ...................................  59
     (b)      Representations and Warranties ...............................  59
     (c)      Closing Certificates .........................................  59
     (d)      Sierra Pacific Material Adverse Effect .......................  60
     (e)      Tax Opinion ..................................................  60
     (f)      Sierra Pacific Required Consents .............................  60
     (g)      Trigger of Sierra Pacific Rights .............................  60
</TABLE>

                                      vi

<PAGE>
 
<TABLE>
<S>           <C>                                                            <C>

                                   ARTICLE 9
                       TERMINATION, AMENDMENT AND WAIVER
 
Section 9.1   Termination ..................................................  60
Section 9.2   Effect of Termination ........................................  63
Section 9.3   Termination Fee; Expenses ....................................  63
     (a)      Expenses Payable upon Non-Wilful Breach ......................  63
     (b)      Termination Fee In Certain Other Events ......................  64
     (c)      Expenses .....................................................  65
Section 9.4   Amendment ....................................................  65
Section 9.5   Waiver .......................................................  66


                                  ARTICLE 10
                              GENERAL PROVISIONS
 
Section 10.1  Non-Survival of Representations, Warranties, Covenants and
                Agreements .................................................  66
Section 10.2  Brokers ......................................................  66
Section 10.3  Notices ......................................................  66
Section 10.4  Miscellaneous ................................................  67
Section 10.5  Interpretation ...............................................  67
Section 10.6  Counterparts; Effect .........................................  68
Section 10.7  Parties in Interest ..........................................  68
Section 10.8  Further Assurances ...........................................  68
</TABLE>


                                      vii

<PAGE>
 
                            INDEX OF DEFINED TERMS
<TABLE>
<CAPTION>
TERM                                                                        PAGE
- ----                                                                        ----
<S>                                                                         <C>
1935 Act..................................................................... 16
Affiliate Agreement.......................................................... 53
Agreement....................................................................  1
Articles of Incorporation....................................................  2
Average Price................................................................  6
Business Combination......................................................... 55
Bylaws.......................................................................  2
California Commission........................................................ 16
Certificate(s)............................................................... 11
Closing...................................................................... 15
Closing Agreement............................................................ 22
Closing Date................................................................. 15
Code......................................................................... 11
Confidentiality Agreement.................................................... 48
Desert Merger Sub............................................................  1
Disclosure Schedules......................................................... 52
Effective Time............................................................... 12
Effective Time of the First Merger...........................................  2
Effective Time of the Second Merger..........................................  2
Election Deadline............................................................ 11
Environmental Claim.......................................................... 28
Environmental Laws........................................................... 28
Environmental Permits........................................................ 27
ERISA........................................................................ 24
Exchange Act................................................................. 19
Exchange Agent............................................................... 10
Exchange Fund................................................................ 10
FERC......................................................................... 19
Final Order.................................................................. 58
First Merger.................................................................  1
Form of Election............................................................. 11
GAAP......................................................................... 20
GCL..........................................................................  2
Governmental Authority....................................................... 18
Hazardous Materials.......................................................... 29
HSR Act...................................................................... 49
Indemnified Liabilities...................................................... 51
Indemnified Parties.......................................................... 51
Indemnified Party............................................................ 51
Initial Termination Date..................................................... 61
IRS.......................................................................... 23
Joint Proxy/Registration Statement........................................... 48
Joint Venture................................................................ 17
</TABLE>
                                     viii
<PAGE>
 
<TABLE>
<S>                                                                          <C>
Lake Merger Sub............................................................... 1
Merger Consideration..........................................................11
Mergers....................................................................... 1
Nevada Commission.............................................................16
Nevada Power.................................................................. 1
Nevada Power Benefit Plans....................................................37
Nevada Power Cash Consideration............................................... 7
Nevada Power Cash Designees................................................... 9
Nevada Power Cash Election.................................................... 7
Nevada Power Cash Election Shares............................................. 8
Nevada Power Cash Number...................................................... 7
Nevada Power Cash Shares...................................................... 9
Nevada Power Certificate......................................................10
Nevada Power Common Stock..................................................... 7
Nevada Power Deminimis Shares................................................. 8
Nevada Power Disclosure Schedule..............................................52
Nevada Power Exchange Ratio................................................... 7
Nevada Power Financial Statements.............................................33
Nevada Power Material Adverse Effect..........................................31
Nevada Power Merger Consideration............................................. 7
Nevada Power Non-Election..................................................... 8
Nevada Power Non-Election Shares.............................................. 8
Nevada Power Non-Prorated Cash Shares......................................... 8
Nevada Power Preference Stock.................................................31
Nevada Power Preferred Stock..................................................31
Nevada Power Required Consents................................................32
Nevada Power Required Statutory Approvals.....................................32
Nevada Power Rights........................................................... 7
Nevada Power Rights Agreement.................................................42
Nevada Power SEC Reports......................................................33
Nevada Power Special Meeting..................................................50
Nevada Power Stock Consideration.............................................. 7
Nevada Power Stock Election................................................... 7
Nevada Power Stock Election Shares............................................ 8
Nevada Power Stock Number..................................................... 7
Nevada Power Stockholders' Approval...........................................41
Nevada Power Target Party.....................................................65
Out-of-Pocket Expenses........................................................63
PBGC..........................................................................24
PCBs..........................................................................29
Power Act.....................................................................19
Proxy Statement...............................................................21
Registration Statement........................................................21
Releases......................................................................29
Representatives...............................................................48
SEC...........................................................................19
</TABLE>
                                      ix
<PAGE>
 
<TABLE>
<S>                                                                          <C>
Second Merger................................................................. 1
Securities Act................................................................19
Shares........................................................................12
Sierra Pacific................................................................ 1
Sierra Pacific Benefit Plans..................................................24
Sierra Pacific Cash Consideration............................................. 3
Sierra Pacific Cash Designees................................................. 5
Sierra Pacific Cash Election.................................................. 3
Sierra Pacific Cash Election Shares........................................... 4
Sierra Pacific Cash Number.................................................... 3
Sierra Pacific Cash Shares.................................................... 5
Sierra Pacific Certificate.................................................... 6
Sierra Pacific Common Stock................................................... 3
Sierra Pacific Deminimis Shares............................................... 4
Sierra Pacific Disclosure Schedule............................................52
Sierra Pacific Exchange Ratio................................................. 3
Sierra Pacific Financial Statements...........................................20
Sierra Pacific Material Adverse Effect........................................16
Sierra Pacific Merger Consideration........................................... 3
Sierra Pacific Non-Election................................................... 4
Sierra Pacific Non-Election Shares............................................ 4
Sierra Pacific Non-Prorated Cash Shares....................................... 4
Sierra Pacific Power..........................................................16
Sierra Pacific Power Class A Preferred Stock..................................17
Sierra Pacific Power Common Stock.............................................17
Sierra Pacific Power Preferred Stock..........................................17
Sierra Pacific Required Consents..............................................18
Sierra Pacific Required Statutory Approvals...................................19
Sierra Pacific Rights......................................................... 3
Sierra Pacific Rights Agreement...............................................30
Sierra Pacific SEC Reports....................................................20
Sierra Pacific Special Meeting................................................50
Sierra Pacific Stock Consideration............................................ 3
Sierra Pacific Stock Election................................................. 4
Sierra Pacific Stock Number................................................... 3
Sierra Pacific Stockholders' Approval.........................................29
Sierra Pacific Target Party...................................................64
Stock Plans...................................................................54
Subsidiary....................................................................16
Surviving Corporation......................................................... 1
Tax Return....................................................................21
Tax Ruling....................................................................22
Taxes.........................................................................21
Three Year Period.............................................................68
Trading Day................................................................... 6
Violation.....................................................................18
</TABLE>
                                       x
<PAGE>
 
          AGREEMENT AND PLAN OF MERGER, dated as of April 29, 1998 (this
"Agreement"), by and among Nevada Power Company, a Nevada corporation ("Nevada
Power"), Sierra Pacific Resources, a Nevada corporation ("Sierra Pacific"),
DESERT Merger Sub, Inc., a Nevada corporation and a wholly-owned subsidiary of
Sierra ("DESERT Merger Sub"), and LAKE Merger Sub, Inc., a Nevada corporation
and a wholly-owned subsidiary of Sierra ("LAKE Merger Sub").

          WHEREAS, Nevada Power and Sierra Pacific have determined to engage in
a strategic business combination transaction as peer firms in a merger of equals
on the terms stated herein;

          WHEREAS, in furtherance thereof, the respective Boards of Directors of
Sierra Pacific and Lake Merger Sub have approved this Agreement and the merger
of Lake Merger Sub with and into Sierra Pacific, with Sierra Pacific being the
surviving corporation (the "First Merger"), and the respective Boards of
Directors of  Nevada Power, Sierra Pacific and Desert Merger Sub have approved
this Agreement and the merger of Nevada Power with and into Desert Merger Sub,
with Desert Merger Sub being the surviving corporation (the "Second Merger," and
together with the First Merger, the "Mergers");

          NOW THEREFORE, in consideration of the premises and the
representations, warranties, covenants and agreements contained herein, the
parties hereto, intending to be legally bound hereby, agree as follows:


                                   ARTICLE 1

                                  THE MERGERS

          Section 1.1  The Mergers.  Upon the terms and subject to the 
conditions of this Agreement:

          a) At the Effective Time of the First Merger (as defined in Section
1.3), Lake Merger Sub will be merged with and into Sierra Pacific, in accordance
with the laws of the State of Nevada. Sierra Pacific will be the surviving
corporation in the First Merger and will continue its corporate existence under
the laws of the State of Nevada. The effects and the consequences of the First
Merger are set forth in Section 1.2(a). Throughout this Agreement, the term
"Sierra Pacific" refers to Sierra Pacific prior to the First Merger or to Sierra
Pacific as the surviving corporation in the First Merger, as the context
requires.

          b) At the Effective Time of the Second Merger (as defined in Section
1.3), Nevada Power will be merged with and into Desert Merger Sub in accordance
with the laws of the State of Nevada. Desert Merger Sub will be the surviving
corporation in the Second Merger (the "Surviving Corporation") and will continue
its corporate existence under the laws of the State of Nevada. The effects and
the consequences of the Second Merger are set forth in Section 1.2(b).
<PAGE>
 
          Section 1.2  Effects of the Mergers.

          (a) At the Effective Time of the First Merger, (i) the articles of
incorporation of Sierra Pacific, as in effect immediately prior to the First
Merger (which will be amended and restated in a form agreed to by Nevada Power
and Sierra Pacific), will be the articles of incorporation of Sierra Pacific
(the "Articles of Incorporation"), as the surviving corporation in the First
Merger, until thereafter amended as provided by law and the Articles of
Incorporation, and (ii) the bylaws of Sierra Pacific, as in effect immediately
prior to the First Merger (which will be amended and restated in a form agreed
to by Nevada Power and Sierra Pacific), will be the bylaws of Sierra Pacific
(the "Bylaws"), as the surviving corporation in the First Merger, until
thereafter amended as provided by law, the Articles of Incorporation and the
Bylaws.  Subject to the foregoing, the additional effects of the First Merger
shall be as provided in the applicable provisions of the General Corporation Law
of the State of Nevada (the "GCL").

          (b) At the Effective Time of the Second Merger, (i) the articles of
incorporation of Desert Merger Sub, as in effect immediately prior to the Second
Merger (which will be amended and restated in a form agreed to by Nevada Power
and Sierra Pacific), will be the articles of incorporation of the Surviving
Corporation until thereafter amended as provided by law and such articles of
incorporation, and (ii) the by-laws of Desert Merger Sub, as in effect
immediately prior to the Second Merger (which will be amended and restated in a
form agreed to by Nevada Power and Sierra Pacific), shall be the by-laws of the
Surviving Corporation until thereafter amended as provided by law, the articles
of incorporation of the Surviving Corporation and such bylaws.  Subject to the
foregoing, the additional effects of the Second Merger shall be as provided in
the applicable provisions of the GCL.

          Section 1.3  Effective Time of the Mergers.  On the Closing Date (as
defined in Section 3.1), articles of merger complying with the requirements of
the GCL will be executed and filed with the Secretary of State of the State of
Nevada with respect to the Mergers. The First Merger shall become effective upon
filing the articles of merger or upon such later date as is agreed upon by the
parties and specified in the articles of merger (the "Effective Time of the
First Merger"). The Second Merger shall become effective upon filing the
articles of merger or upon such later date as is agreed upon by the parties and
specified in the articles of merger (the "Effective Time of the Second Merger").
The First Merger will occur immediately prior to the Second Merger.


                                   ARTICLE 2

                              TREATMENT OF SHARES

          Section 2.1  Effect on the Capital Stock of Sierra Pacific of the 
First Merger. As of the Effective Time of the First Merger, by virtue of the
First Merger and without any action on the part of any holder of Sierra Pacific
Common Stock (as hereinafter defined):

          (a) Cancellation of Lake Merger Sub Shares. Each share of common
stock, without par value, of Lake Merger Sub issued and outstanding immediately
prior to the Effective

                                       2
<PAGE>
 
Time of the First Merger will automatically be canceled and retired and will
cease to exist, and no consideration will be delivered in exchange therefor.

          (b) Cancellation of Sierra Pacific Treasury Stock and Sub-Owned Stock.
Each share of common stock, par value $1.00 per share, of Sierra Pacific
("Sierra Pacific Common Stock"), together with the associated purchase rights
(the "Sierra Pacific Rights") under the Sierra Pacific Rights Agreement (as
defined in Section 4.18), that is owned by Sierra Pacific or by any wholly owned
subsidiary of Sierra Pacific will automatically be canceled and retired and will
cease to exist, and no consideration will be delivered in exchange therefor.
Throughout this Agreement, the term "Sierra Pacific Common Stock" refers to the
Sierra Pacific Common Stock together with the associated Sierra Pacific Rights.

          (c) Conversion of Sierra Pacific Common Stock. Subject to the
provisions of Section 2.3(e) hereof, each issued and outstanding share of Sierra
Pacific Common Stock (other than shares of Sierra Pacific Common Stock to be
canceled in accordance with Section 2.1(b)) will be converted into either (x)
$37.55 in cash (the "Sierra Pacific Cash Consideration") or (y) 1.44 (the
"Sierra Pacific Exchange Ratio") fully paid and non-assessable shares of Sierra
Pacific Common Stock (the "Sierra Pacific Stock Consideration" and, together
with the Sierra Pacific Cash Consideration, the "Sierra Pacific Merger
Consideration"), in each case as the holder thereof shall have elected or be
deemed to have elected, in accordance with Section 2.1(e).

          (d) Allocation.  Notwithstanding anything in this Agreement to the
contrary, the number of shares of Sierra Pacific Common Stock to be converted
into the right to receive the Sierra Pacific Cash Consideration in the First
Merger (the "Sierra Pacific Cash Number") will be equal to (i) 4,037,809 shares
of Sierra Pacific Common Stock less (ii) the aggregate number of shares of
Sierra Pacific Common Stock to be exchanged for cash pursuant to Section
2.3(e). The number of shares of Sierra Pacific Common Stock to be converted
into the right to receive the Sierra Pacific Stock Consideration in the First
Merger (the "Sierra Pacific Stock Number") will be equal to (i) the number of
shares of Sierra Pacific Common Stock issued and outstanding immediately prior
to the Effective Time of the First Merger (ignoring for this purpose any Sierra
Pacific Common Stock held as treasury shares and canceled pursuant to Section
2.1(b)) less (ii) the sum of (A) the Sierra Pacific Cash Number and (B) the
aggregate number of shares of Sierra Pacific Common Stock to be exchanged for
cash pursuant to Section 2.3(e). Notwithstanding anything to the contrary
herein, Sierra Pacific will have the option, with the prior consent of Nevada
Power, to change the Sierra Pacific Cash Number and the Sierra Pacific Stock
Number to more closely follow the actual elections of the Sierra Pacific
stockholders pursuant to this Section 2.1, so long as such modification to the
Sierra Pacific Cash Number and the Sierra Pacific Stock Number does not prevent
the conditions set forth in Sections 8.2(e) and 8.3(e) from being satisfied.

          (e) Election. Subject to allocation in accordance with the provisions
of this Section 2.1, each record holder of shares of Sierra Pacific Common Stock
(other than shares to be canceled in accordance with Section 2.1(b)) issued and
outstanding immediately prior to the Election Deadline (as defined in Section
2.3(b)(i)) will be entitled, in accordance with Section 2.3(b), (i) to elect to
receive in respect of each such share (A) the Sierra Pacific Cash Consideration
(a "Sierra Pacific Cash Election") or (B) the Sierra Pacific Stock Consideration
(a

                                       3
<PAGE>
 
"Sierra Pacific Stock Election") or (ii) to indicate that such record holder has
no preference as to the receipt of the Sierra Pacific Cash Consideration or the
Sierra Pacific Stock Consideration for all such shares held by such holder (a
"Sierra Pacific Non-Election"); provided, however, that, except as provided in
Section 2.1(i), all record holders of Sierra Pacific Common Stock who (x) own
less than 100 shares of Sierra Pacific Common Stock or (y) elect to receive the
Sierra Pacific Stock Consideration in respect of less than 100 shares of Sierra
Pacific Common Stock (all such shares being herein referred to as the "Sierra
Pacific Deminimis Shares") will be deemed to have elected to receive the Sierra
Pacific Cash Consideration. Shares of Sierra Pacific Common Stock in respect of
which a Sierra Pacific Non-Election is made or as to which no election is made
(collectively, "Sierra Pacific Non-Election Shares") shall be deemed by Sierra
Pacific, with the prior consent of Nevada Power, to be shares in respect of
which Sierra Pacific Cash Elections or Sierra Pacific Stock Elections have been
made, as Sierra Pacific shall determine.

          (f) Allocation of Sierra Pacific Cash Election Shares. In the event
that the aggregate number of shares in respect of which Sierra Pacific Cash
Elections have been made or are deemed to have been made in accordance with the
proviso at the end of the first sentence of Section 2.1(e) (the "Sierra Pacific
Cash Election Shares") exceeds the Sierra Pacific Cash Number, all shares of
Sierra Pacific Common Stock in respect of which Sierra Pacific Stock Elections
have been made ("the Sierra Pacific Stock Election Shares") and all Sierra
Pacific Non-Election Shares will be converted into the right to receive the
Sierra Pacific Stock Consideration (and cash in lieu of fractional interests in
accordance with Section 2.3(e)), and the Sierra Pacific Cash Election Shares
will be converted into the right to receive the Sierra Pacific Cash
Consideration or the Sierra Pacific Stock Consideration in the following manner:

               (i) all Sierra Pacific Deminimis Shares will be converted into
          the right to receive the Sierra Pacific Cash Consideration;

               (ii) the number of Sierra Pacific Cash Election Shares, other
          than Sierra Pacific Deminimis Shares, covered by each Form of Election
          (as defined in Section 2.3(b)(i)) to be converted into Sierra Pacific
          Cash Consideration will be determined by multiplying the number of
          Sierra Pacific Cash Election Shares covered by such Form of Election
          by a fraction, (A) the numerator of which is the Sierra Pacific Cash
          Number less the number of Sierra Pacific Deminimis Shares and (B) the
          denominator of which is the aggregate number of Sierra Pacific Cash
          Election Shares less the number of Sierra Pacific Deminimis Shares,
          rounded down to the nearest whole number; provided, however, that, if
          as a result of such proration, any holder of Sierra Pacific Cash
          Election Shares would, but for this proviso, receive less than 100
          shares of Sierra Pacific Common Stock in accordance with Section
          2.1(f)(iii), all Sierra Pacific Cash Election Shares held by such
          holders (the "Sierra Pacific Non-Prorated Cash Shares") will be
          converted into the Sierra Pacific Cash Consideration and the remaining
          Sierra Pacific Cash Election Shares to be converted into the Sierra
          Pacific Cash Consideration will be determined by multiplying the
          number of Sierra Pacific Cash Election Shares covered by such Form of
          Election by a fraction, (A) the numerator of which is the Sierra
          Pacific Cash Number less the sum of the number of Sierra Pacific
          Deminimis Shares and Sierra Pacific Non-Prorated Cash Shares and (B)
          the denominator of

                                       4
<PAGE>
 
          which is the aggregate number of Sierra Pacific Cash Election Shares
          less the sum of the number of Sierra Pacific Deminimis Shares and
          Sierra Pacific Non-Prorated Cash Shares, rounded down to the nearest
          whole number; provided further, however, that, if the number of Sierra
          Pacific Non-Prorated Cash Shares exceeds the difference between the
          Sierra Pacific Cash Number and the number of Sierra Pacific Deminimis
          Shares, the Sierra Pacific Non-Prorated Cash Shares will be converted
          into the Sierra Pacific Cash Consideration by selecting, by lottery or
          such other method as mutually agreed to by Sierra Pacific and Nevada
          Power, from among the record holders of Sierra Pacific Non-Prorated
          Cash Shares a sufficient number of such holders (the "Sierra Pacific
          Cash Designees") such that the number of Sierra Pacific Cash Election
          Shares held by the Sierra Pacific Cash Designees will, when added to
          the Sierra Pacific Deminimis Shares, be equal as closely as
          practicable to the Sierra Pacific Cash Number, and all such Sierra
          Pacific Cash Election Shares held by such Sierra Pacific Cash
          Designees will be converted into the right to receive the Sierra
          Pacific Cash Consideration; provided, however, that no such Sierra
          Pacific Cash Designee shall receive both Sierra Pacific Stock
          Consideration and Sierra Pacific Cash Consideration for such holder's
          Sierra Pacific Common Stock and that Sierra Pacific may, in accordance
          with Section 2.1(d), change the Sierra Pacific Cash Number and the
          Sierra Pacific Stock Number in order to meet this requirement; and

               (iii) all Sierra Pacific Cash Election Shares not converted into
          Sierra Pacific Cash Consideration in accordance with Section 2.1(f)(i)
          or (ii) will be converted into the right to receive the Sierra Pacific
          Stock Consideration (and cash in lieu of fractional interests in
          accordance with Section 2.3(e)).

          (g) Allocation of Sierra Pacific Stock Election Shares. In the event
that the aggregate number of Sierra Pacific Stock Election Shares exceeds the
Sierra Pacific Stock Number, all Sierra Pacific Cash Election Shares and all
Sierra Pacific Non-Election Shares (together, the "Sierra Pacific Cash Shares")
will be converted into the right to receive the Sierra Pacific Cash
Consideration, and all Sierra Pacific Stock Election Shares will be converted
into the right to receive the Sierra Pacific Cash Consideration or the Sierra
Pacific Stock Consideration in the following manner:

               (i) the number of Sierra Pacific Stock Election Shares covered by
          each Form of Election to be converted into Sierra Pacific Cash
          Consideration will be determined by multiplying the number of Sierra
          Pacific Stock Election Shares covered by such Form of Election by a
          fraction, (A) the numerator of which is the Sierra Pacific Cash Number
          less the number of Sierra Pacific Cash Shares and (B) the denominator
          of which is the aggregate number of Sierra Pacific Stock Election
          Shares, rounded down to the nearest whole number; and

               (ii) all Sierra Pacific Stock Election Shares not converted into
          Sierra Pacific Cash Consideration in accordance with Section 2.1(g)(i)
          will be converted into the right to receive the Sierra Pacific Stock
          Consideration (and cash in lieu of fractional interests in accordance
          with Section 2.3(e)).

                                       5
<PAGE>
 
          (h) No Allocation. In the event that neither Section 2.1(f) nor
Section 2.1(g) is applicable, all Sierra Pacific Cash Election Shares will be
converted into the right to receive the Sierra Pacific Cash Consideration, all
Sierra Pacific Stock Election Shares will be converted into the right to receive
the Sierra Pacific Stock Consideration (and cash in lieu of fractional interests
in accordance with Section 2.3(e)) and Sierra Pacific Non-Election Shares will
be converted into the right to receive the Sierra Pacific Cash Consideration or
the Sierra Pacific Stock Consideration (and cash in lieu of fractional interests
in accordance with Section 2.3(e)) as Sierra Pacific, with the prior consent of
Nevada Power, shall determine.

          (i) Proration of Sierra Pacific Deminimis Shares. In the event that,
at the Election Deadline, the value of the Sierra Pacific Stock Consideration,
determined by multiplying the Sierra Pacific Exchange Ratio by the Average Price
of a share of Sierra Pacific Common Stock, exceeds 120% of the value of the
Sierra Pacific Cash Consideration, Sierra Pacific will have the option, with the
prior consent of Nevada Power, to more closely follow the actual election of the
Sierra Pacific stockholders who hold Sierra Pacific Deminimis Shares without
regard to the proviso at the end of the first sentence of Section 2.1(e).
"Average Price" means the average of the closing prices as reported in The Wall
Street Journal's New York Stock Exchange Composite Transactions Reports for each
of the 20 consecutive Trading Days in the period ending on the Election
Deadline. "Trading Day" means a day on which the New York Stock Exchange, Inc.
is open for trading.

          (j) Computations. The Exchange Agent, in consultation with Sierra
Pacific and Nevada Power, will make all computations to give effect to this
Section 2.1.

          (k) Cancellation of Shares. As of the Effective Time of the First
Merger, all such shares of Sierra Pacific Common Stock will no longer be
outstanding and will automatically be canceled and retired and will cease to
exist and each holder of a certificate formerly representing any such shares of
Sierra Pacific Common Stock (a "Sierra Pacific Certificate") will cease to have
any rights with respect thereto, except the right to receive the Sierra Pacific
Merger Consideration and any additional cash in lieu of fractional shares of
Sierra Pacific Common Stock to be issued or paid in consideration therefor upon
surrender of such Sierra Pacific Certificate in accordance with Section 2.3,
without interest.

     Section 2.2  Effect on the Capital Stock of Nevada Power of the Second
Merger.  As of the Effective Time of the Second Merger, by virtue of the Second
Merger and without any action on the part of any holder of Nevada Power Common
Stock (as hereinafter defined):

          (a) Conversion of Desert Merger Sub Shares. Each share of common
stock, without par value, of Desert Merger Sub issued and outstanding
immediately prior to the Effective Time of the Second Merger will remain
outstanding unaffected by the Second Merger, with the result that the Surviving
Corporation will remain a wholly owned subsidiary of Sierra Pacific.

          (b) Cancellation of Nevada Power Treasury Stock and Sub-Owned Stock.
Each share of common stock, par value $1.00 per share, of Nevada Power ("Nevada
Power Common Stock"), together with the associated purchase rights (the "Nevada
Power Rights")

                                       6
<PAGE>
 
under the Nevada Power Rights Agreement (as defined in Section 5.18), that is
owned by Nevada Power or by any wholly owned subsidiary of Nevada Power or by
Sierra Pacific or any wholly owned subsidiary of Sierra Pacific will
automatically be canceled and retired and will cease to exist, and no
consideration will be delivered in exchange therefor. Throughout this Agreement,
the term "Nevada Power Common Stock" refers to Nevada Power Common Stock
together with the associated Nevada Power Rights.

          (c) Conversion of Nevada Power Common Stock. Subject to the provisions
of Section 2.3(e) hereof, each issued and outstanding share of Nevada Power
Common Stock (other than shares of Nevada Power Common Stock to be canceled in
accordance with Section 2.2(b)) will be converted into either (x) $26.00 in cash
(the "Nevada Power Cash Consideration") or (y) 1.00 (the "Nevada Power Exchange
Ratio") fully paid and non-assessable shares of Sierra Pacific Common Stock (the
"Nevada Power Stock Consideration" and, together with the Nevada Power Cash
Consideration, the "Nevada Power Merger Consideration"), in each case as the
holder thereof shall have elected or be deemed to have elected, in accordance
with Section 2.2(e).

          (d) Allocation.  Notwithstanding anything in this Agreement to the 
contrary, the number of shares of Nevada Power Common Stock to be converted into
the right to receive the Nevada Power Cash Consideration in the Second Merger
(the "Nevada Power Cash Number") will be equal to (i) 11,715,084 shares of
Nevada Power Common Stock less (ii) the aggregate number of shares of Nevada
Power Common Stock to be exchanged for cash pursuant to Section 2.3(e). The
number of shares of Nevada Power Common Stock to be converted into the right to
receive the Nevada Power Stock Consideration in the Second Merger (the "Nevada
Power Stock Number") will be equal to (i) the number of shares of Nevada Power
Common Stock issued and outstanding immediately prior to the Effective Time of
the Second Merger (ignoring for this purpose any Nevada Power Common Stock held
as treasury shares and canceled pursuant to Section 2.2(b)) less (ii) the sum of
(A) the Nevada Power Cash Number and (B) the aggregate number of shares of
Nevada Power Common Stock to be exchanged for cash pursuant to Section 2.3(e).
Notwithstanding anything to the contrary herein, Nevada Power will have the
option, with the prior consent of Sierra Pacific, to change the Nevada Power
Cash Number and the Nevada Power Stock Number to more closely follow the actual
elections of the Nevada Power stockholders pursuant to this Section 2.2, so long
as such modification to the Nevada Power Cash Number and the Nevada Power Stock
Number does not prevent the conditions set forth in Sections 8.2(e) and 8.3(e)
from being satisfied.

          (e) Election. Subject to allocation in accordance with the provisions
of this Section 2.2, each record holder of shares of Nevada Power Common Stock
(other than shares to be canceled in accordance with Section 2.2(b)) issued and
outstanding immediately prior to the Election Deadline will be entitled, in
accordance with Section 2.3(b), (i) to elect to receive in respect of each such
share (A) the Nevada Power Cash Consideration (a "Nevada Power Cash Election")
or (B) the Nevada Power Stock Consideration (a "Nevada Power Stock Election") or
(ii) to indicate that such record holder has no preference as to the receipt of
the Nevada Power Cash Consideration or the Nevada Power Stock Consideration for
all such shares held by such holder (a "Nevada Power Non-Election"); provided,
however, that, except as provided in Section 2.2(i), all record holders of
Nevada Power Common Stock who (x) own less than 100 shares of Nevada Power
Common Stock or (y) elect to receive the Nevada Power Stock

                                       7
<PAGE>
 
Consideration in respect of less than 100 shares of Nevada Power Common Stock
(all such shares being herein referred to as the "Nevada Power Deminimis
Shares") will be deemed to have elected to receive the Nevada Power Cash
Consideration. Shares of Nevada Power Common Stock in respect of which a Nevada
Power Non-Election is made or as to which no election is made (collectively,
"Nevada Power Non-Election Shares") shall be deemed by Nevada Power, with the
prior consent of Sierra Pacific, to be shares in respect of which Nevada Power
Cash Elections or Nevada Power Stock Elections have been made, as Nevada Power
shall determine.

          (f) Allocation of Nevada Power Cash Election Shares. In the event that
the aggregate number of shares in respect of which Nevada Power Cash Elections
have been made or are deemed to have been made in accordance with the proviso at
the end of the first sentence of Section 2.2(e) (the "Nevada Power Cash Election
Shares") exceeds the Nevada Power Cash Number, all shares of Nevada Power Common
Stock in respect of which Nevada Power Stock Elections have been made (the
"Nevada Power Stock Election Shares") and all Nevada Power Non-Election Shares
will be converted into the right to receive the Nevada Power Stock Consideration
(and cash in lieu of fractional interests in accordance with Section 2.3(e)),
and the Nevada Power Cash Election Shares will be converted into the right to
receive the Nevada Power Cash Consideration or the Nevada Power Stock
Consideration in the following manner:

               (i) all Nevada Power Deminimis Shares will be converted into the
          right to receive the Nevada Power Cash Consideration;

               (ii) the number of Nevada Power Cash Election Shares, other than
          Nevada Power Deminimis Shares, covered by each Form of Election to be
          converted into Nevada Power Cash Consideration will be determined by
          multiplying the number of Nevada Power Cash Election Shares covered by
          such Form of Election by a fraction, (A) the numerator of which is the
          Nevada Power Cash Number less the number of Nevada Power Deminimis
          Shares and (B) the denominator of which is the aggregate number of
          Nevada Power Cash Election Shares less the number of Nevada Power
          Deminimis Shares, rounded down to the nearest whole number; provided,
          however, that, if as a result of such proration, any holder of Nevada
          Power Cash Election Shares would, but for this proviso, receive less
          than 100 shares of Sierra Pacific Common Stock in accordance with
          Section 2.2(f)(iii), all Nevada Power Cash Election Shares held by
          such holders (the "Nevada Power Non-Prorated Cash Shares") will be
          converted into the Nevada Power Cash Consideration and the remaining
          Nevada Power Cash Election Shares to be converted into the Nevada
          Power Cash Consideration will be determined by multiplying the number
          of Nevada Power Cash Election Shares covered by such Form of Election
          by a fraction, (A) the numerator of which is the Nevada Power Cash
          Number less the sum of the number of Nevada Power Deminimis Shares and
          Nevada Power Non-Prorated Cash Shares and (B) the denominator of which
          is the aggregate number of Nevada Power Cash Election Shares less the
          sum of the number of Nevada Power Deminimis Shares and Nevada Power
          Non-Prorated Cash Shares, rounded down to the nearest whole number;
          provided further, however, that, if the number of Nevada Power Non-
          Prorated Cash Shares exceeds the difference between the Nevada Power
          Cash Number and the number of

                                       8
<PAGE>
 
          Nevada Power Deminimis Shares, the Nevada Power Non-Prorated Cash
          Shares will be converted into the Nevada Power Cash Consideration by
          selecting, by lottery or such other method as mutually agreed to by
          Sierra Pacific and Nevada Power, from among the record holders of
          Nevada Power Non-Prorated Cash Shares a sufficient number of such
          holders (the "Nevada Power Cash Designees") such that the number of
          Nevada Power Cash Election Shares held by the Nevada Power Cash
          Designees will, when added to the Nevada Power Deminimis Shares, be
          equal as closely as practicable to the Nevada Power Cash Number, and
          all such Nevada Power Cash Election Shares held by such Nevada Power
          Cash Designees will be converted into the right to receive the Nevada
          Power Cash Consideration; provided, however, that no such Nevada Power
          Cash Designee shall receive both Nevada Power Stock Consideration and
          Nevada Power Cash Consideration for such holder's Nevada Power Common
          Stock and that Nevada Power may, in accordance with Section 2.2(d),
          change the Nevada Power Cash Number and the Nevada Power Stock Number
          in order to meet this requirement; and

               (iii) all Nevada Power Cash Election Shares not converted into
          Nevada Power Cash Consideration in accordance with Section 2.2(f)(i)
          or (ii) will be converted into the right to receive the Nevada Power
          Stock Consideration (and cash in lieu of fractional interests in
          accordance with Section 2.3(e)).

          (g) Allocation of Nevada Power Stock Election Shares. In the event
that the aggregate number of Nevada Power Stock Election Shares exceeds the
Nevada Power Stock Number, all Nevada Power Cash Election Shares and all Nevada
Power Non-Election Shares (together, the "Nevada Power Cash Shares") will be
converted into the right to receive the Nevada Power Cash Consideration, and all
Nevada Power Stock Election Shares will be converted into the right to receive
the Nevada Power Cash Consideration or the Nevada Power Stock Consideration in
the following manner:

               (i) the number of Nevada Power Stock Election Shares covered by
          each Form of Election to be converted into Nevada Power Cash
          Consideration will be determined by multiplying the number of Nevada
          Power Stock Election Shares covered by such Form of Election by a
          fraction, (A) the numerator of which is the Nevada Power Cash Number
          less the number of Nevada Power Cash Shares and (B) the denominator of
          which is the aggregate number of Nevada Power Stock Election Shares,
          rounded down to the nearest whole number; and

               (ii) all Nevada Power Stock Election Shares not converted into
          Nevada Power Cash Consideration in accordance with Section 2.2(g)(i)
          will be converted into the right to receive the Nevada Power Stock
          Consideration (and cash in lieu of fractional interests in accordance
          with Section 2.3(e)).

          (h) No Allocation. In the event that neither Section 2.2(f) nor
Section 2.2(g) is applicable, all Nevada Power Cash Election Shares shall be
converted into the right to receive the Nevada Power Cash Consideration, all
Nevada Power Stock Election Shares shall be converted into the right to receive
the Nevada Power Stock Consideration (and cash in lieu of

                                       9
<PAGE>
 
fractional interests in accordance with Section 2.3(e)) and Nevada Power Non-
Election Shares will be converted into the right to receive the Nevada Power
Cash Consideration or the Nevada Power Stock Consideration (and cash in lieu of
fractional interests in accordance with Section 2.3(e)) as Nevada Power, with
the prior consent of Sierra Pacific, shall determine.

          (i) Proration of Nevada Power Deminimis Shares.  In the event that, at
the Election Deadline, the value of the Nevada Power Stock Consideration,
determined by multiplying the Nevada Power Exchange Ratio by the Average Price
of a share of Sierra Pacific Common Stock, exceeds 120% of the value of the
Nevada Power Cash Consideration at the Election Deadline, Nevada Power will have
the option, with the prior consent of Sierra Pacific, to more closely follow the
actual election of the Nevada Power stockholders who hold Nevada Power Deminimis
Shares without regard to the proviso at the end of the first sentence of Section
2.2(e).

          (j) Computations.  The Exchange Agent, in consultation with Sierra
Pacific and Nevada Power, will make all computations to give effect to this
Section 2.2.

          (k) Cancellation of Shares.  As of the Effective Time of the Second
Merger, all such shares of Nevada Power Common Stock will no longer be
outstanding and will automatically be canceled and retired and will cease to
exist and each holder of a certificate formerly representing any such shares of
Nevada Power Common Stock (a "Nevada Power Certificate") will cease to have any
rights with respect thereto, except the right to receive the Nevada Power Merger
Consideration and any additional cash in lieu of fractional shares of Sierra
Pacific Common Stock to be issued or paid in consideration therefor upon
surrender of such Nevada Power Certificate in accordance with Section 2.3, 
without interest.

     Section  2.3  Exchange of Certificates.

          (a) Exchange Agent.  As of the Effective Time of the First Merger,
Sierra Pacific will enter into an agreement with such bank or trust company as
may be designated by Sierra Pacific, with the prior consent of Nevada Power (the
"Exchange Agent"), which will provide that Sierra Pacific will deposit with the
Exchange Agent as of the Effective Time of the First Merger, for the benefit of
the holders of shares of Sierra Pacific Common Stock and Nevada Power Common
Stock for exchange in accordance with this Article 2, through the Exchange
Agent, cash equal to the sum of the total aggregate Sierra Pacific Cash
Consideration and Nevada Power Cash Consideration and certificates representing
the shares of Sierra Pacific Common Stock (such cash and such shares of Sierra
Pacific Common Stock, together with any dividends or distributions with respect
thereto with a record date after the Effective Time of the Second Merger and any
cash payable in lieu of any fractional shares of Sierra Pacific Common Stock,
being hereinafter referred to as the "Exchange Fund") issuable pursuant to
Sections 2.1 and 2.2 in exchange for outstanding shares of Sierra Pacific Common
Stock and Nevada Power Common Stock, as the case may be.

           (b) Exchange Procedures.

                                      10
<PAGE>
 
               (i) Not more than 90 days nor fewer than 30 days prior to the
          Closing Date, the Exchange Agent will mail a form of election (a "Form
          of Election") to holders of record of shares of Sierra Pacific Common
          Stock and to the holders of record of shares of Nevada Power Common
          Stock (as of a record date as close as practicable to the date of
          mailing and mutually agreed to by Sierra Pacific and Nevada Power).
          In addition, the Exchange Agent will use its best efforts to make the
          Form of Election available to all persons who become stockholders of
          Sierra Pacific or Nevada Power during the period between such record
          date and the Closing Date. Any election to receive the Sierra Pacific
          Merger Consideration contemplated by Section 2.1(e) or the Nevada
          Power Merger Consideration contemplated by Section 2.2(e) (as
          applicable, the "Merger Consideration") will have been properly made
          only if the Exchange Agent shall have received at its designated
          office or offices, by 5:00 p.m., New York City time, on the business
          day immediately preceding the Closing Date (the "Election Deadline"),
          a Form of Election properly completed and accompanied by a Sierra
          Pacific Certificate or a Nevada Power Certificate, as the case may be
          (together or as applicable, "Certificate(s)") for the shares to which
          such Form of Election relates, duly endorsed in blank or otherwise
          acceptable for transfer on the books of Sierra Pacific or Nevada
          Power, as the case may be (or an appropriate guarantee of delivery),
          as set forth in such Form of Election. An election may be revoked only
          by written notice received by the Exchange Agent prior to 5:00 p.m.,
          New York City time, on the Election Deadline. In addition, all
          elections shall automatically be revoked if the Exchange Agent is
          notified in writing by Sierra Pacific and Nevada Power that either of
          the Mergers has been abandoned. If an election is so revoked, the
          Certificate(s) (or guarantee of delivery, as appropriate) to which
          such election relates will be promptly returned to the person
          submitting the same to the Exchange Agent.

               (ii) Two or more holders of Sierra Pacific Common Stock or Nevada
          Power Common Stock who are determined to constructively own the shares
          of Sierra Pacific Common Stock or Nevada Power Common Stock, as the
          case may be, owned by each other by virtue of Section 318(a) of the
          Internal Revenue Code of 1986, as amended (the "Code"), and who so
          certify to Sierra Pacific's and Nevada Power's satisfaction, and any
          single holder of shares of Sierra Pacific Common Stock or Nevada Power
          Common Stock who holds his shares in two or more different names and
          who so certifies to Sierra Pacific's and Nevada Power's satisfaction,
          may submit a joint Form of Election covering the aggregate shares of
          Sierra Pacific Common Stock or Nevada Power Common Stock, as the case
          may be, owned by all such holders or by such single holder, as the
          case may be.  For all purposes of this Agreement, each such group of
          holders that, and each such single holder who, submits a joint Form of
          Election shall be treated as a single holder of Sierra Pacific Common
          Stock or Nevada Power Common Stock, as the case may be.

               (iii) Record holders of Sierra Pacific Common Stock or Nevada
          Power Common Stock who are nominees only may submit a separate Form of
          Election 

                                      11
<PAGE>
 
          for each beneficial owner for whom such record holder is a nominee;
          provided, however, that on the request of Sierra Pacific or Nevada
          Power, such record holder shall certify to the satisfaction of Sierra
          Pacific or Nevada Power that such record holder holds such Sierra
          Pacific Common Stock or Nevada Power Common Stock, as the case may be,
          as nominee for the beneficial owner thereof. For purposes of this
          Agreement, each beneficial owner for which a Form of Election is
          submitted will be treated as a separate holder of Sierra Pacific
          Common Stock or Nevada Power Common Stock, as the case may be,
          subject, however, to the immediately preceding sub-paragraph (ii)
          dealing with joint Forms of Election and the immediately following 
          sub-paragraph (iii) dealing with dividend reinvestment plans.

               (iv) Any dividend reinvestment plan of either Sierra Pacific or
          Nevada Power will be treated as a single holder of Sierra Pacific
          Common Stock or Nevada Power Common Stock, respectively, for the
          purposes of Section 2.3(e).

               (v) As soon as reasonably practicable after the Effective Time of
          the First Merger, with respect to the First Merger, and the Effective
          Time of the Second Merger, with respect to the Second Merger (together
          or as applicable, the "Effective Time"), the Exchange Agent will mail
          to each holder of record of a Certificate, whose shares of Sierra
          Pacific Common Stock or Nevada Power Common Stock (collectively, the
          "Shares"), were converted into the right to receive the Merger
          Consideration and who failed to return a properly completed Form of
          Election, (i) a letter of transmittal (which will specify that
          delivery will be effected, and risk of loss and title to the
          Certificates will pass, only upon delivery of the Certificates to the
          Exchange Agent and will be in such form and have such other provisions
          as Sierra Pacific and Nevada Power may specify consistent with this
          Agreement) and (ii) instructions for use in effecting the surrender of
          the Certificates in exchange for the Merger Consideration.

               (vi) At the Effective Time, with respect to properly made
          elections in accordance with Section 2.3(b)(i), and upon surrender in
          accordance with Section 2.3(b)(v) of a Certificate for cancellation to
          the Exchange Agent or to such other agent or agents as may be
          appointed by Sierra Pacific and Nevada Power, together with such
          letter of transmittal, duly executed, and such other documents as may
          reasonably be required by the Exchange Agent, the holder of such
          Certificate will be entitled to receive in exchange therefor the
          Merger Consideration that such holder has the right to receive
          pursuant to the provisions of this Article 2, and the Certificate so
          surrendered will forthwith be canceled. In the event of a transfer of
          ownership of Shares that are not registered in the transfer records of
          Sierra Pacific or Nevada Power, as the case may be, payment may be
          issued to a Person other than the Person in whose name the Certificate
          so surrendered is registered if such Certificate is properly endorsed
          or otherwise in proper form for transfer and the Person requesting
          such issuance pays any transfer or other taxes required by reason of
          such payment to a Person other than the registered holder of such
          Certificate or establishes to the satisfaction of Sierra

                                      12
<PAGE>
 
          Pacific and Nevada Power that such tax has been paid or is not
          applicable. Until surrendered as contemplated by this Section 2.3,
          each Certificate will be deemed at any time after the Effective Time
          to represent only the right to receive upon such surrender the Merger
          Consideration that the holder thereof has the right to receive in
          respect of such Certificate pursuant to the provisions of this Article
          2. No interest will be paid or will accrue on any cash payable to
          holders of Certificates pursuant to the provisions of this Article 2.

          (c) Distributions with Respect to Unexchanged Shares.  No dividends or
other distributions with respect to Sierra Pacific Common Stock with a record
date after the Effective Time will be paid to the holder of any unsurrendered
Certificate with respect to the shares of Sierra Pacific Common Stock
represented thereby, no cash payment in lieu of fractional shares will be paid
pursuant to Section 2.3(e) and all such dividends, other distributions and cash
in lieu of fractional shares of Sierra Pacific Common Stock will be paid by
Sierra Pacific to the Exchange Agent and will be included in the Exchange Fund,
in each case in accordance with this Article 2. Subject to the effect of
applicable escheat or similar laws, following surrender of any Certificate in
accordance herewith there will be paid to the holder of the certificate
representing whole shares of Sierra Pacific Common Stock issued in exchange
therefor, without interest, (i) at the time of such surrender, the amount of
dividends or other distributions with a record date after the Effective Time
theretofore paid with respect to such whole shares of Sierra Pacific Common
Stock and, in the case of Certificates, the amount of any cash payable in lieu
of a fractional share of Sierra Pacific Common Stock to which such holder is
entitled pursuant to Section 2.3(e) and (ii) at the appropriate payment date,
the amount of dividends or other distributions with a record date after the
Effective Time but prior to such surrender and with a payment date subsequent to
such surrender payable with respect to such whole shares of Sierra Pacific
Common Stock.

          (d) No Further Ownership Rights in Shares.  All shares of Sierra
Pacific Common Stock issued upon the surrender for exchange of Certificates in
accordance with the terms of this Article 2 (including any cash paid pursuant to
this Article 2) will be deemed to have been issued (and paid) in full
satisfaction of all rights pertaining to the Shares theretofore represented by
such Certificates, and there will be no further registration of transfers on the
stock transfer books of Sierra Pacific with respect to previously outstanding
shares of Sierra Pacific Common Stock or the stock transfer books of the
Surviving Corporation with respect to previously outstanding shares of Nevada
Power Common Stock.  If, after the Effective Time, Certificates are presented to
Sierra Pacific, the Surviving Corporation or the Exchange Agent for any reason,
they will be canceled and exchanged as provided in this Article 2.

          (e) No Fractional Shares
 
               (i) No certificates or scrip representing fractional shares of
          Sierra Pacific Common Stock will be issued upon the surrender for
          exchange of Certificates, no dividend or distribution of Sierra
          Pacific will relate to such fractional share interests and such
          fractional share interests will not entitle the owner thereof to vote
          or to any rights of a stockholder of Sierra Pacific.

                                      13
<PAGE>
 
               (ii) Notwithstanding any other provision of this Agreement, each
          holder of Shares converted pursuant to the Mergers who would otherwise
          be entitled to receive a fraction of a share of Sierra Pacific Common
          Stock (after taking into account all Shares held at the Effective Time
          by such holder) shall receive, in lieu thereof, an amount in cash
          (without interest) equal to the product obtained by multiplying (A)
          the fractional share interest to which such holder would otherwise be
          entitled by (B) the average closing price for a share of Sierra
          Pacific Common Stock as reported on the NYSE Composite Combination
          Tape (as reported in the Wall Street Journal, or, if not reported
          thereby, any other authoritative source) for the ten trading days
          prior to the Closing Date.

               (iii) As soon as practicable after the determination of the
          amount of cash, if any, to be paid to holders of Shares with respect
          to any fractional share interests, the Exchange Agent will make
          available such amounts to such holders of Shares subject to and in
          accordance with the terms of Section 2.3(c).

          (f) Termination of Exchange Fund.  Any portion of the Exchange Fund
which remains undistributed to the holders of the Certificates for six months
after the Effective Time will be delivered to Sierra Pacific, upon demand, and
any holders of the Certificates who have not theretofore complied with this
Article 2 will thereafter look only to Sierra Pacific for payment of their claim
for Merger Consideration, any cash in lieu of fractional shares of Sierra
Pacific Common Stock and any dividends or distributions with respect to Sierra
Pacific Common Stock.

          (g) No Liability.  None of Sierra Pacific, Nevada Power, Lake Merger
Sub, Desert Merger Sub or the Exchange Agent will be liable to any Person in
respect of any shares of Sierra Pacific Common Stock (or dividends or
distributions with respect thereto) or cash from the Exchange Fund delivered to
a public official pursuant to any applicable abandoned property, escheat or
similar law.  If any Certificate has not been surrendered prior to one year
after the Effective Time (or immediately prior to such earlier date on which any
Merger Consideration, any cash payable to the holder of such Certificate
representing Shares pursuant to this Article 2 or any dividends or distributions
payable to the holder of such Certificate would otherwise escheat to or become
the property of any governmental entity), any such Merger Consideration or cash,
dividends or distributions in respect of such Certificate will become the
property of Sierra Pacific, free and clear of all claims or interest of any
Person previously entitled thereto.

          (h) Investment of Exchange Fund.  The Exchange Agent will invest any
cash included in the Exchange Fund, as directed by Sierra Pacific, with the
prior consent of Nevada Power, on a daily basis.  Any interest and other income
resulting from such investments will be paid to Sierra Pacific.

          (i) Lost Certificates.  If any Certificate is lost, stolen or
destroyed, upon the making of an affidavit of that fact by the Person claiming
such Certificate to be lost, stolen or destroyed and, if required by Sierra
Pacific or the Surviving Corporation, as the case may be, the posting by such
Person of a bond in such reasonable amount as Sierra Pacific or the Surviving
Corporation, as the case may be, may direct as indemnity against any claim that
may be made against it with respect to such Certificate, the Exchange Agent will
issue in exchange for such

                                      14
<PAGE>
 
lost, stolen or destroyed Certificate the Merger Consideration and, if
applicable, any cash in lieu of fractional shares, and unpaid dividends and
distributions on shares of Sierra Pacific Common Stock or deliverable in respect
thereof, pursuant to this Agreement.

          (j) Determination of Proper Elections.  Without limiting the
generality or effect of any other provision hereof, the Exchange Agent will have
discretion to determine whether or not elections have been properly made or
revoked pursuant to this Article 2 with respect to Shares and when elections and
revocations were received by it.  If the Exchange Agent determines that any
election was not properly made with respect to Shares, such Shares will be
treated by the Exchange Agent as, and for all purposes of this Agreement will be
deemed to be, Sierra Pacific Non-Election Shares or Nevada Power Non-Election
Shares, as the case may be, at the Effective Time.  The Exchange Agent will also
make computations as to the allocation and proration contemplated by this
Article 2 and any such computation will be conclusive and binding.  The Exchange
Agent may, with the mutual agreement of Sierra Pacific and Nevada Power, make
such equitable changes in the procedures set forth herein for the implementation
of the elections provided for in this Article 2 as it determines to be necessary
or desirable to effect fully such elections.

     Section 2.4  Certain Adjustments.  If after the date hereof and on or
prior to the Closing Date, the outstanding shares of Sierra Pacific Common Stock
or Nevada Power Common Stock shall be changed into a different number of shares
by reason of any reclassification, recapitalization, split-up, combination or
exchange of shares, or any dividend payable in stock or other securities is
declared thereon with a record date within such period, or any similar event
shall occur, the Sierra Pacific Merger Consideration and the Nevada Power Merger
Consideration will be adjusted accordingly to provide to the holders of Sierra
Pacific Common Stock and Nevada Power Common Stock, respectively, the same
economic effect as contemplated by this Agreement prior to such
reclassification, recapitalization, split-up, combination, exchange or dividend
or similar event.


                                   ARTICLE 3

                                  THE CLOSING

          Section 3.1  Closing.  The closing of the Mergers (the "Closing")
will take place at such place and at such time as Nevada Power and Sierra
Pacific shall mutually agree on the second business day immediately following
the date on which the last of the conditions set forth in Article 8 hereof is
fulfilled or waived, or on such other date as Nevada Power and Sierra Pacific
shall mutually agree (the "Closing Date").

                                      15
<PAGE>
 
                                  ARTICLE 4

           REPRESENTATIONS AND WARRANTIES OF EACH OF SIERRA PACIFIC,
                     LAKE MERGER SUB AND DESERT MERGER SUB

          Each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub
represents and warrants to Nevada Power as follows (for purposes of this Article
4, the term "Sierra Pacific" shall be deemed to include Sierra Pacific and
Sierra Pacific Power Company, a Nevada corporation and a wholly-owned subsidiary
of Sierra Pacific ("Sierra Pacific Power"), except where the context otherwise
requires):

          Section 4.1  Organization and Qualification.  Except as set forth in
Section 4.1 of the Sierra Pacific Disclosure Schedule (as defined in Section 
7.6(i)), each of Sierra Pacific and its subsidiaries is a corporation duly
organized, validly existing and in good standing under the laws of its state of
incorporation, has all requisite corporate power and authority, and has been
duly authorized by all necessary approvals and orders of the Public Utilities
Commission of Nevada ("Nevada Commission") and the Public Utilities Commission
of California ("California Commission"), to own, lease and operate its assets
and properties and to carry on its business as it is now being conducted, and is
duly qualified and in good standing to do business in each jurisdiction in which
the nature of its business or the ownership or leasing of its assets and
properties makes such qualification necessary other than in such jurisdictions
where the failure to be so qualified and in good standing will not, when taken
together with all other such failures, have a material adverse effect on the
business, operations, assets, financial condition or the results of operations
of Sierra Pacific and its subsidiaries taken as a whole or on the consummation
of this Agreement (any such material adverse effect being hereinafter referred
to as a "Sierra Pacific Material Adverse Effect"). As used in this Agreement,
the term "subsidiary" of a person shall mean any corporation or other entity
(including partnerships, limited liability entities and other business
associations and joint ventures) in which such person directly or indirectly
owns at least a majority of any class of outstanding voting securities, equity,
partnership interests, membership interests or the like.

          Section 4.2  Subsidiaries.  Section 4.2 of the Sierra Pacific
Disclosure Schedule sets forth a description of all subsidiaries and joint
ventures of Sierra Pacific, including the name of each such entity, the state or
jurisdiction of its incorporation or formation, a brief description of the
principal line or lines of business conducted by each such entity and Sierra
Pacific's interest therein.  Except as set forth in Section 4.2 of the Sierra
Pacific Disclosure Schedule, none of such entities 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)(7), 2(a)(8)
or 2(a)(11), respectively, of the Public Utility Holding Company Act of 1935, as
amended (the "1935 Act").  Except as set forth in Section 4.2 of the Sierra 
Pacific Disclosure Schedule, all of the issued and outstanding shares of capital
stock or other securities of, or interests in, each subsidiary or joint venture
of Sierra Pacific are validly issued, fully paid, nonassessable and free of
preemptive rights, are owned directly or indirectly by Sierra Pacific free and
clear of any liens, claims, encumbrances, security interests, equities, charges
and options of any nature whatsoever, and there are no outstanding
subscriptions, options, calls, contracts, voting trusts, proxies or other
commitments, understandings, restrictions, arrangements, rights or warrants,
including any

                                      16
<PAGE>
 
right of conversion or exchange under any outstanding security, instrument or
other agreement, obligating any such subsidiary to issue, deliver or sell, or
cause to be issued, delivered or sold, additional shares of its capital stock or
obligating it to grant, extend or enter into any such agreement or commitment.
As used in this Agreement, the term "joint venture" of a person shall mean any
corporation or other entity (including partnerships and other business
associations and joint ventures) in which such person or one or more of its
subsidiaries owns an equity interest that is less than a majority of any class
of the outstanding voting securities or equity, other than equity interests held
for passive investment purposes which are less than 5% of any class of the
outstanding voting securities or equity of any such entity.

          Section 4.3  Capitalization.
 
          (a) The authorized capital stock of Sierra Pacific consists of
90,000,000 shares of Sierra Pacific Common Stock. As of the close of business on
April 28, 1998, 30,940,819 shares of Sierra Pacific Common Stock were issued and
outstanding. All of the issued and outstanding shares of the capital stock of
Sierra Pacific are validly issued, fully paid, nonassessable and free of
preemptive rights. Except as set forth in Section 4.3 of the Sierra Pacific
Disclosure Schedule, there are no outstanding subscriptions, options, calls,
contracts, voting trusts, proxies or other commitments, understandings,
restrictions, arrangements, rights or warrants, including any right of
conversion or exchange under any outstanding security, instrument or other
agreement, obligating Sierra Pacific or any of its subsidiaries to issue,
deliver or sell, or cause to be issued, delivered or sold, additional shares of
the capital stock of Sierra Pacific, or obligating Sierra Pacific or any of its
subsidiaries to grant, extend or enter into any such agreement or commitment
other than the Sierra Pacific Rights Agreement.

          (b) The authorized capital stock of Sierra Pacific Power consists of
20,000,000 shares of common stock, par value $3.75 per share ("Sierra Pacific
Power Common Stock"), 1,780,500 shares of preferred stock, par value $50 per
share ("Sierra Pacific Power Preferred Stock") and 10,000,000 shares of Class A
preferred stock, par value $25 per share ("Sierra Pacific Power Class A
Preferred Stock").  As of the close of business on April 28, 1998, (i) 1,000
shares of Sierra Pacific Power Common Stock; (ii) 462,300 shares of Sierra
Pacific Power Preferred Stock (consisting of 80,500 shares of the A series,
82,000 shares of the B series, and 299,800 shares of the C series) and (iii)
2,000,000 shares of Sierra Pacific Power Class A Preferred Stock were issued and
outstanding.  As of the date hereof, Sierra Pacific Capital I, a wholly-owned
subsidiary of Sierra Pacific Power, had 2,000,000 8.6% Trust Originated
Preferred Securities issued and outstanding, 60,000 of which are owned by Sierra
Pacific Power, and 60,000 Common Securities issued and outstanding, all of which
are owned by Sierra Pacific Power.

          (c) The authorized capital stock of Lake Merger Sub consists of 100
shares of common stock, ten shares of which are validly issued and outstanding,
fully paid and nonassessable and owned by Sierra Pacific.

          (d) The authorized capital stock of Desert Merger Sub consists of 100
shares of common stock, ten shares of which are validly issued and outstanding,
fully paid and nonassessable and owned by Sierra Pacific.

                                      17
<PAGE>
 
     Section 4.4  Authority; Non-Contravention; Statutory Approvals; Compliance.

          (a) Authority.  Each of Sierra Pacific, Lake Merger Sub and Desert
Merger Sub has all requisite power and authority to enter into this Agreement,
and, subject to the applicable Sierra Pacific Stockholders' Approval (as defined
in Section 4.13) and the Sierra Pacific Required Statutory Approvals (as
hereinafter defined), to consummate the transactions contemplated hereby. The
execution and delivery of this Agreement and the consummation by each of Sierra
Pacific, Lake Merger Sub and Desert Merger Sub of the transactions contemplated
hereby have been duly authorized by all necessary corporate action on the part
of each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub, subject to
obtaining the Sierra Pacific Stockholders' Approval. This Agreement has been
duly and validly executed and delivered by each of Sierra Pacific, Lake Merger
Sub and Desert Merger Sub, and assuming the due authorization, execution and
delivery hereof by Nevada Power, constitutes the valid and binding obligation of
each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub enforceable
against each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub in
accordance with its terms.

          (b) Non-Contravention.  The execution and delivery of this Agreement
by each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub does not, and
the consummation of the transactions contemplated hereby will not, violate,
conflict with or result in a breach of any provision of, or constitute a default
(with or without notice or lapse of time or both) under, or result in the
termination or modification of, or accelerate the performance required by, or
result in a right of termination, cancellation, or acceleration of any
obligation or the loss of a material benefit under, or result in the creation of
any lien, security interest, charge or encumbrance upon any of the properties or
assets (any such violation, conflict, breach, default, right of termination,
modification, cancellation or acceleration, loss or creation, a "Violation") of
Sierra Pacific or any of its subsidiaries or joint ventures pursuant to any
provisions of (i) the articles of incorporation, bylaws or similar governing
documents of Sierra Pacific or any of its subsidiaries or joint ventures, (ii)
subject to obtaining the Sierra Pacific Required Statutory Approvals and the
receipt of the Sierra Pacific Stockholders' Approvals, any statute, law,
ordinance, rule, regulation, judgment, decree, order, injunction, writ, permit
or license of any Governmental Authority (as hereinafter defined) applicable to
Sierra Pacific or any of its subsidiaries or joint ventures or any of their
respective properties or assets or (iii) subject to obtaining the third-party
consents or other approvals set forth in Section 4.4(b) of the Sierra Pacific
Disclosure Schedule (the "Sierra Pacific Required Consents") any note, bond,
mortgage, indenture, deed of trust, license, franchise, permit, concession,
contract, lease or other instrument, obligation or agreement of any kind to
which Sierra Pacific or any of its subsidiaries or any joint venture of Sierra
Pacific is now a party or by which it or any of its properties or assets may be
bound or affected, excluding from the foregoing clauses (ii) and (iii) such
Violations that would not, in the aggregate, have a Sierra Pacific Material
Adverse Effect.

          (c) Statutory Approvals.  Except as described in Section 4.4(c) of the
Sierra Pacific Disclosure Schedule, no declaration, filing or registration with,
or notice to or authorization, consent or approval of, any court, governmental
or regulatory body (including a stock exchange or other self-regulatory body) or
authority, federal, state, local or foreign (each, a "Governmental Authority"),
is necessary for the execution and delivery of this Agreement by each of Sierra
Pacific, Lake Merger Sub and Desert Merger Sub or the consummation by each of

                                      18
<PAGE>
 
Sierra Pacific, Lake Merger Sub and Desert Merger Sub of the transactions
contemplated hereby, the failure of which to obtain, make or give would have, in
the aggregate, a Sierra Pacific Material Adverse Effect (the "Sierra Pacific
Required Statutory Approvals", it being understood that references in this
Agreement to "obtaining" such Sierra Pacific Required Statutory Approvals shall
mean making such declarations, filings or registrations; giving such notices;
obtaining such authorizations, consents or approvals; and having such waiting
periods expire as are necessary to avoid a violation of law).

          (d) Compliance.  Except as set forth in Section 4.4(d) or Section 4.11
of the Sierra Pacific Disclosure Schedule or as disclosed in the Sierra Pacific
Reports (as defined in Section 4.5), neither Sierra Pacific nor any of its
subsidiaries nor, to the knowledge of Sierra Pacific, any joint ventures of
Sierra Pacific, is in violation of or is under investigation with respect to, or
has been given notice or been charged with any violation of, any law, statute,
order, rule, regulation, ordinance or judgments (including, without limitation,
applicable Environmental Laws, as hereinafter defined) of any Governmental
Authority, except for violations which, in the aggregate, do not have, and, to
the knowledge of Sierra Pacific, are not reasonably likely to have, a Sierra
Pacific Material Adverse Effect. Except as set forth in Section 4.4(d) or
Section 4.11 of the Sierra Pacific Disclosure Schedule, Sierra Pacific and its
subsidiaries and any joint ventures have all permits, licenses, franchises and
other governmental authorizations, consents and approvals necessary to conduct
their businesses as currently conducted, except those of which the failure to
obtain would not, in the aggregate, have a Sierra Pacific Material Adverse
Effect. Except as set forth in Section 4.4(d) of the Sierra Pacific Disclosure
Schedule, neither Sierra Pacific or any of its subsidiaries nor, to the
knowledge of Sierra Pacific, any joint venture of Sierra Pacific is in breach or
violation of or in default in the performance or observance of any term or
provision of, and no event has occurred which, with lapse of time or action by a
third party or both could result in a default by Sierra Pacific or any Sierra
Pacific subsidiary or, to the knowledge of Sierra Pacific, any joint venture of
Sierra Pacific under (i) its articles of incorporation or bylaws or (ii) any
contract, commitment, agreement, indenture, mortgage, loan agreement, note,
lease, bond, license, approval or other instrument to which it is a party or by
which Sierra Pacific or any subsidiary or joint venture of Sierra Pacific is
bound or to which any of its property is subject, except for possible
violations, breaches or defaults which individually or in the aggregate would
not have a Sierra Pacific Material Adverse Effect.

          Section 4.5  Reports and Financial Statements.  Since January 1, 1995,
the filings required to be made by Sierra Pacific and its subsidiaries under the
Securities Act of 1933, as amended (the "Securities Act"), the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), applicable state laws and
regulations regulating public utilities, the Federal Power Act (the "Power Act")
or the 1935 Act have been filed with the Securities and Exchange Commission (the
"SEC"), the Nevada Commission, the California Commission or the Federal Energy
Regulatory Commission (the "FERC"), as the case may be, including all forms,
statements, reports, agreements (oral or written) and all documents, exhibits,
amendments and supplements appertaining thereto, and complied in all material
respects with all applicable requirements of the appropriate act and the rules
and regulations thereunder.  Sierra Pacific has made available to Nevada Power a
true and complete copy of each report, schedule, registration statement and
definitive proxy statement filed by Sierra Pacific or Sierra Pacific Utility
with the SEC since January 1, 1995 (as such documents have since the time of
their filing been amended,

                                      19
<PAGE>
 
the "Sierra Pacific SEC Reports").  As of their respective dates, the Sierra
Pacific SEC Reports did not contain any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading.  The audited consolidated financial statements and
unaudited interim financial statements of Sierra Pacific included in the Sierra
Pacific SEC Reports (collectively, the "Sierra Pacific Financial Statements")
have been prepared in accordance with generally accepted accounting principles
applied on a consistent basis ("GAAP") (except as may be indicted therein or in
the notes thereto and except with respect to unaudited statements as permitted
by Form 10-Q of the SEC) and fairly present the financial position of Sierra
Pacific and its subsidiaries as of the dates thereof and the results of their
operations and cash flows for the periods then ended, subject, in the case of
the unaudited interim financial statements, to normal, recurring audit
adjustments. True, accurate and complete copies of the articles of incorporation
and bylaws of Sierra Pacific, as in effect on the date hereof, have been
delivered to Nevada Power.

          Section 4.6  Absence of Certain Changes or Events; Absence of
Undisclosed Liabilities.  (a) Except as set forth in the Sierra Pacific SEC
Reports or Section 4.6 of the Sierra Pacific Disclosure Schedule, from December
31, 1997, through the date hereof each of Sierra Pacific and its subsidiaries
has conducted its business only in the ordinary course of business consistent
with past practice and there has not been, and no fact or condition exists which
would have or, to the knowledge of Sierra Pacific, is reasonably likely to have,
a Sierra Pacific Material Adverse Effect.

          (b) Neither Sierra Pacific nor any of its subsidiaries has any
liabilities or obligations (whether absolute, accrued, contingent or otherwise)
of a nature required by GAAP to be reflected in a consolidated corporate balance
sheet, except liabilities, obligations or contingencies that are accrued or
reserved against in the consolidated financial statements of Sierra Pacific or
reflected in the notes thereto for the year ended December 31, 1997, or which
were incurred after December 31, 1997 in the ordinary course of business and
would not, in the aggregate, have a Sierra Pacific Material Adverse Effect.

          Section 4.7  Litigation.  Except as disclosed in the Sierra Pacific
SEC Reports or as set forth in Section 4.7 or Section 4.11 of the Sierra Pacific
Disclosure Schedule, (i) there are no claims, suits, actions or proceedings,
pending or, to the knowledge of Sierra Pacific, threatened, nor are there, to
the knowledge of Sierra Pacific, any investigations or reviews pending or
threatened against, relating to or affecting Sierra Pacific or any of its
subsidiaries and (ii) there are no judgments, decrees, injunctions, rules or
orders of any court, governmental department, commission, agency,
instrumentality or authority or any arbitrator applicable to Sierra Pacific or
any of its subsidiaries, which when taken together with any of the matters
described in clauses (i) or (ii), would have, or to the knowledge of Sierra
Pacific is reasonably likely to have, a Sierra Pacific Material Adverse Effect.
In addition, except as disclosed in the Sierra Pacific SEC Reports or as set
forth in Section 4.7 or Section 4.11 of the Sierra Pacific Disclosure Schedule,
there have not been any developments since December 31, 1997, with respect to
such disclosed claims, suits, actions, proceedings, investigations or reviews,
which, in the aggregate, would have,

                                      20
<PAGE>
 
or to the knowledge of Sierra Pacific is reasonably likely to have, a Sierra
Pacific Material Adverse Effect.

          Section 4.8  Registration Statement and Proxy Statement.  None of the
information supplied or to be supplied by or on behalf of Sierra Pacific for
inclusion or incorporation by reference in (i) the registration statement on
Form S-4, or any post-effective amendment to the registration statement on Form
S-4, to be filed with the SEC in connection with the issuance of shares of
Sierra Pacific Common Stock in the Mergers (the "Registration Statement") will,
at the time the Registration Statement is filed with the SEC and at the time it
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading and (ii) the joint
proxy statement, in definitive form, relating to the meetings of Nevada Power
and Sierra Pacific stockholders to be held in connection with the Mergers (the
"Proxy Statement") will not, at the dates mailed to stockholders and at the
times of the meetings of stockholders to be held in connection with the Mergers,
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.  The Registration Statement and the Proxy Statement, insofar as they
relate to Sierra Pacific or any of its subsidiaries, will comply as to form in
all material respects with the applicable provisions of the Securities Act and
the Exchange Act and the rules and regulations thereunder.

          Section 4.9  Tax Matters.  "Taxes," as used in this Agreement, means
any federal, state, county, local or foreign taxes, charges, fees, levies, or
other assessments, including all net income, gross income, sales and use, ad
valorem, transfer, gains, profits, excise, franchise, real and personal
property, gross receipt, capital stock, production, business and occupation,
disability, employment, payroll, license, estimated, stamp, custom duties,
severance or withholding taxes or charges imposed by any governmental entity,
and includes any interest and penalties (civil or criminal) on or additions to
any such taxes and any expenses incurred in connection with the determination,
settlement or litigation of any tax liability.  "Tax Return," as used in this
Agreement, means a report, return or other information required to be supplied
to a governmental entity with respect to Taxes including, where permitted or
required, combined or consolidated returns for any group or entities that
include Sierra Pacific or any of its subsidiaries on the one hand, or Nevada
Power or any of its subsidiaries on the other hand.

          (a) Filing of Timely Tax Returns.  Sierra Pacific and each of its
subsidiaries have filed all Tax Returns required to be filed by each of them
under applicable law.  All Tax Returns were in all material respects (and, as to
Tax Returns not filed as of the date hereof, will be) true, complete and correct
and filed on a timely basis.

          (b) Payment of Taxes.  Sierra Pacific and each of its subsidiaries
have, within the time and in the manner prescribed by law, paid (and until the
Closing Date will pay within the time and in the manner prescribed by law) all
Taxes that are currently due and payable except for those contested in good
faith and for which adequate reserves have been taken.

                                      21
<PAGE>
 
          (c) Tax Liens.  There are no material Tax liens upon the assets of
Sierra Pacific or any of its subsidiaries except liens for Taxes not yet due.

          (d) Withholding Taxes.  Sierra Pacific and each of its subsidiaries
have complied (and until the Closing Date will comply) in all respects with the
provisions of the Code relating to the payment and withholding of Taxes,
including, without limitation, the withholding and reporting requirements under
Code (S)(S) 1441 through 1464, 3401 through 3606, and 6041 and 6049, as well as
similar provisions under any other laws, and have, within the time and in the
manner prescribed bylaw, withheld from employee wages and paid over to the
proper governmental authorities all amounts required.

          (e) Extensions of Time for Filing Tax Returns.  Except as disclosed in
Section  of the Sierra Pacific Disclosure Schedule, neither Sierra Pacific nor
any of its subsidiaries has requested any extension of time within which to file
any Tax Return, which Tax Return has not since been filed.

          (f) Waivers of Statute of Limitations.  Except as disclosed in
Section 4.9(f) of the Sierra Pacific Disclosure Schedule, neither Sierra Pacific
nor any of its subsidiaries has executed any outstanding waivers or comparable
consents regarding the application of the statute of limitations with respect to
any Taxes or Tax Returns.

          (g) Expiration of Statute of Limitations.  Except as disclosed in
Section 4.9(g) of the Sierra Pacific Disclosure Schedule, the statute of
limitations for the assessment of all Taxes has expired for all applicable Tax
Returns of Sierra Pacific and each of its subsidiaries or those Tax Returns have
been examined by the appropriate taxing authorities for all periods through the
date hereof, and no deficiency for any Taxes has been proposed, asserted or
assessed against Sierra Pacific or any of its subsidiaries that has not been
resolved and paid in full.

          (h) Audit, Administrative and Court Proceedings.  Except as disclosed
in Section 4.9(h) of the Sierra Pacific Disclosure Schedule, no audits or other
administrative proceedings or court proceedings are presently pending, and no
material issue raised remains unsettled, with regard to any Taxes or Tax Returns
of Sierra Pacific or any of its subsidiaries.

          (i) Powers of Attorney.  Except as disclosed in Section 4.9(i) of the
Sierra Pacific Disclosure Schedule, no power of attorney currently in force has
been granted by Sierra Pacific or any of its subsidiaries concerning any Tax
matter.

          (j) Tax Rulings.  Except as disclosed in Section 4.9(j) of the Sierra
Pacific Disclosure Schedule, neither Sierra Pacific nor any of its subsidiaries
has received a Tax Ruling (as defined below) or entered into a Closing Agreement
(as defined below) with any taxing authority that would have a continuing
adverse effect after the Closing Date.  "Tax Ruling," as used in this Agreement,
shall mean a written ruling of a taxing authority relating to Taxes. "Closing
Agreement," as used in this Agreement, shall mean a written and legally binding
agreement with a taxing authority relating to Taxes.

                                      22
<PAGE>
 
          (k) Availability of Tax Returns.  As soon as practicable after the
date hereof, Sierra Pacific and its subsidiaries will make available to Nevada
Power complete and accurate copies of (i) all Tax Returns, and any amendments
thereto, filed by Sierra Pacific or any of its subsidiaries since January 1,
1990, (ii) all audit reports received from any taxing authority relating to any
Tax Return filed by Sierra Pacific or any of its subsidiaries and (iii) any
Closing Agreements entered into by Sierra Pacific or any of its subsidiaries
with any taxing authority.

          (l) Tax Sharing Agreements.  Except as disclosed in Section 4.9(l) of
the Sierra Pacific Disclosure Schedule, no agreements relating to allocating or
sharing of Taxes exist between or among Sierra Pacific and any of its
subsidiaries.

          (m) Code (S) 341(f).  Neither Sierra Pacific nor any of its
subsidiaries has filed (or will file prior to the Closing) a consent pursuant to
Code (S) 341(f) or has agreed to have Code (S) 341(f)(2) apply to any
disposition of a subsection (f) asset (as that term is defined in Code (S)
341(f)(4)) owned by Sierra Pacific or any of its subsidiaries.

          (n) Code (S) 168.  Except as set forth in Section 4.9(n) of the Sierra
Pacific Disclosure Schedule, no property of Sierra Pacific or any of its
subsidiaries is property that Sierra Pacific or any such subsidiary or any party
to this transaction is or will be required to treat as being owned by another
person pursuant to the provisions of Code (S) 168(f)(8) (as in effect prior to
its amendment by the Tax Reform Act of 1986) or is "tax-exempt use property"
within the meaning of Code (S) 168.

          (o) Code (S) 481 Adjustments.  Except as set forth in Section 4.9(o) 
of the Sierra Pacific Disclosure Schedule, neither Sierra Pacific nor any of its
subsidiaries is required to include in income any adjustment pursuant to Code
(S) 481(a) by reason of a voluntary change in accounting method initiated by
Sierra Pacific or any of its subsidiaries, and to the best of the knowledge of
Sierra Pacific, the Internal Revenue Service (the "IRS") has not proposed any
such adjustment or change in accounting method.

          (p) Code (S)(S) 6661 and 6662.  All transactions that could give rise
to an understatement of federal income tax (within the meaning of Code (S) 6661
or Code (S) 6662) that could reasonably be expected to result in a Sierra
Pacific Material Adverse Effect have been adequately disclosed (or, with respect
to Tax Returns filed following the Closing will be adequately disclosed) on the
Tax Returns of Sierra Pacific and its subsidiaries in accordance with Code (S)
6661(b)(2)(B) or Code (S) 6662(d)(2)(B).

          (q) Code (S) 280G.  Except as set forth in Section 4.9(q) of the
Sierra Pacific Disclosure Schedule, neither Sierra Pacific nor any of its
subsidiaries is a party to any agreement, contract, or arrangement that could
result, on account of the transactions contemplated hereunder, separately or in
the aggregate, in the payment of any "excess parachute payments" within the
meaning of Code (S) 280G.

          (r) Liability for Others.  Neither Sierra Pacific nor any of its
subsidiaries has any liability for Taxes of any person other than Sierra Pacific
and its subsidiaries under Treasury

                                      23
<PAGE>
 
Regulations Section 1.1502-6 (or any similar provision of state, local or
foreign law) as a transferee or successor, by contract or otherwise.

          Section 4.10  Employee Matters:  ERISA.

          (a) Benefit Plans.  Section 4.10(a) of the Sierra Pacific Disclosure 
Schedule contains a true and complete list of each employee benefit plan,
program or arrangement sponsored, maintained or contributed to by and covering
employees, former employees, directors or former directors of Sierra Pacific (or
any of its subsidiaries or any other entity which would be treated under Section
414 of the Code as a single employer with Sierra Pacific) or any of their
dependents or beneficiaries, or providing benefits to such persons in respect of
services provided to any such entity including, but not limited to, any employee
benefit plans within the meaning of Section 3(3) of the Employee Retirement
Income Security Act of 1974, as amended ("ERISA"), any management, employment,
deferred compensation, severance (including any payment, right or benefit
resulting from a change in control), bonus or other contract for personal
services with any current or former officer, director or employee, any
consulting contract with any person who prior to entering into such contract was
a director or officer of Sierra Pacific or any of its subsidiaries or any plan,
agreement, arrangement or understanding similar to any of the foregoing
(collectively, the "Sierra Pacific Benefit Plans"). None of the Sierra Pacific
Benefit Plans is a multiemployer plan within the meaning of ERISA.

          (b) Contributions.  Except as set forth in Section 4.10(b) of the 
Sierra Pacific Disclosure Schedule, all contributions and other payments
required to have been made by Sierra Pacific or any of its subsidiaries
(including any pre-or post-tax contributions or payments by employees or their
dependents) to any Sierra Pacific Benefit Plan (or to any person pursuant to the
terms thereof) have been so made or the amount of such payment or contribution
obligation has been reflected in the Sierra Pacific Financial Statements.

          (c) Qualification: Compliance.  Except as set forth in Section 4.10(c)
of the Sierra Pacific Disclosure Schedule, each of the Sierra Pacific Benefit
Plans that are intended to be "qualified" within the meaning of Code (S) 401(a)
has been determined by the IRS to be so qualified, and to the best knowledge of
Sierra Pacific, no circumstances exist that are reasonably expected by Sierra
Pacific to result in the revocation of any such determination. Sierra Pacific is
not in noncompliance in any respect with, and no Sierra Pacific Benefit Plan is
or has been operated in noncompliance with it terms and with, any applicable
law, rule or regulation governing such plan, including, without limitation,
ERISA and the Code, except as would not have a Sierra Pacific Material Adverse
Effect.

          (d) Liabilities.  With respect to the Sierra Pacific Benefit Plans,
individually and in the aggregate, no event has occurred, and, to the best
knowledge of Sierra Pacific, there exists no condition or set of circumstances
that could subject Sierra Pacific or any of its subsidiaries to any liabilities
arising under the Code, ERISA or any other applicable law (including, without
limitation, any liability to any such plan or the Pension Benefit Guaranty
Corporation (the "PBGC")), or under any indemnity agreement to which Sierra
Pacific is a party, which liability, excluding liability for benefit claims and
funding obligations payable in the ordinary course and

                                      24
<PAGE>
 
liability for premiums due to the PBGC, would have, or insofar as reasonably can
be foreseen, could have, a Sierra Pacific Material Adverse Effect.

          (e) Welfare Plans.  Except as set forth in Section 4.10(e) of the 
Sierra Pacific Disclosure Schedule, none of the Sierra Pacific Benefit Plans
that are "Welfare Plans," within the meaning of Section 3(1) of ERISA, provides
for any retiree benefits.

          (f) Documents Made Available.  Sierra Pacific has made available to
Nevada Power a true and correct copy of each collective bargaining agreement to
which Sierra Pacific is a party or under which Sierra Pacific has obligations
and, with respect to each Sierra Pacific Benefit Plan, (i) such plan and the
most recent summary plan description, (ii) the most recent annual report filed
with the IRS, (iii) each related trust agreement, insurance contract, service
provider or investment management agreement (including all amendments to each
such document), (iv) the most recent determination of the IRS with respect to
the qualified status of such plan and (v) the most recent actuarial report or
valuation.

          (g) Payments Resulting from Merger.  Other than as set forth in
Section 7.11 or in Section 4.10(g) of the Sierra Pacific Disclosure Schedule,
the consummation, announcement or other action relating to the transactions
contemplated by this Agreement will not (either alone or upon the occurrence of
any additional or further acts or events) result in any (A) payment (whether of
severance pay or otherwise) becoming due from Sierra Pacific or any of its
subsidiaries to any officer, employee, former employee, director or former
director thereof or to the trustee under any "rabbi trust" or similar
arrangement, or (B) benefit under any Sierra Pacific Benefit Plan being
established or being accelerated, vested or payable.

          (h) Funded Status of Plans.  Except as set forth in Section 4.10(h) of
the Sierra Pacific Disclosure Schedule, the failure of any Sierra Pacific
Benefit Plan which is subject to the requirements of Code (S) 412, Part 3 of
Title I of ERISA or Title IV of ERISA to hold assets, the fair market value of
which, as of the date hereof, are at least equal in value to the greatest of the
projected benefit obligations, the accumulated benefit obligations or accrued
benefit obligations (each determined as of the date hereof) of the participants
and beneficiaries under such plan, based on actuarial methods, tables and
assumptions theretofore utilized by such plan's actuary to determine the plan's
funded status, would not give rise to a Sierra Pacific Material Adverse Effect.

          (i) Certain Other Obligations.  Except as set forth in Section 4.10(i)
of the Sierra Pacific Disclosure Schedule, the termination of, or withdrawal
from, any employee pension benefit plan within the meaning of (S) 3(2) of ERISA
(including any single employer, multiple employer or multiemployer plan) or
subject to Title IV of ERISA by Sierra Pacific or any corporation or other
entity which is, or at any time was, a subsidiary of Sierra Pacific or would be
treated under Section 414 of the Code as single employer with Sierra Pacific has
not, and will not, subject Sierra Pacific (or any subsidiary of Sierra Pacific)
to any liability of or to any governmental authority, corporation or other
person or such employee pension plan which individually or in the aggregate
would have a Sierra Pacific Material Adverse Effect.

          (j) Modification or Termination of Plans.  Except as set forth in
Section 4.10(j) of the Sierra Pacific Disclosure Schedule, (i) neither Sierra 
Pacific nor any 

                                      25
<PAGE>
 
subsidiary of Sierra Pacific is subject to any legal, contractual, equitable or
other obligation to establish or contribute to as of any date any new Sierra
Pacific Benefit Plan or amend any existing Sierra Pacific Benefit Plan; and (ii)
to the best knowledge of Sierra Pacific or any of its subsidiaries after review
of all plan documents, Sierra Pacific and each of its subsidiaries may (except
to the extent prohibited by applicable law), in any manner, and without the
consent of any employee, beneficiary or dependent, employees' organization or
other person, terminate, modify or amend each Sierra Pacific Benefit Plan (or
its participation in any such Sierra Pacific Benefit Plan) at any time
sponsored, maintained or contributed to by Sierra Pacific or any of its
subsidiaries effective as of any date before, on or after the Effective Time.

          (k) Labor Agreements.  Except as disclosed in the Sierra Pacific SEC
Reports or as set forth in Section 4.10(k) of the Sierra Pacific Disclosure
Schedule: (i) neither Sierra Pacific nor any of its subsidiaries is a party to
any collective bargaining agreement or other labor agreement with any union or
labor organization; (ii) to the best knowledge of Sierra Pacific or any of its
subsidiaries, there is no current union representation question involving
employees of Sierra Pacific or any of its subsidiaries, nor does Sierra Pacific
or any of its subsidiaries know of any activity or proceeding of any labor
organization (or representative thereof) or employee group (or representative
thereof) to organize any such employees; (iii) there is no unfair labor
practice, charge or written grievance arising out of a collective bargaining
agreement or other grievance procedure against Sierra Pacific or any of its
subsidiaries pending, or to the best knowledge of Sierra Pacific or any of its
subsidiaries, threatened, which has, or reasonably may be expected by Sierra
Pacific or any of its subsidiaries to have, a Sierra Pacific Material Adverse
Effect; (iv) there is no compliant, lawsuit or proceeding in any forum by or on
behalf of any present or former employee, any applicant for employment or
classes of the foregoing alleging breach of any express or implied contract of
employment, any law or regulation governing employment or the termination
thereof or other discriminatory, wrongful or tortious conduct in connection with
the employment relationship against Sierra Pacific or any of its subsidiaries
pending, or to the best knowledge of Sierra Pacific or any of its subsidiaries,
threatened, which has, or reasonably may be expected by Sierra Pacific or any of
its subsidiaries to have, a Sierra Pacific Material Adverse Effect; (v) there is
no strike, dispute, slowdown, work stoppage or lockout pending, or to the best
knowledge of Sierra Pacific or any of its subsidiaries, threatened, against or
involving Sierra Pacific or any of its subsidiaries which has or, insofar as
reasonably can be foreseen, could have, a Sierra Pacific Material Adverse
Effect; (vi) Sierra Pacific and each of its subsidiaries are in compliance with
all applicable laws respecting employment and employment practices, terms and
conditions of employment, wages, hours of work and occupational safety and
health, except for non-compliance which, in the aggregate, does not, and insofar
as reasonably can be foreseen, will not have a Sierra Pacific Material Adverse
Effect; and (vii) there is no proceeding, claim, suit, action or governmental
investigation pending or, to the best knowledge of Sierra Pacific or any of its
subsidiaries, threatened, in respect to which any director, officer, employee or
agent of Sierra Pacific or any of its subsidiaries is or may be entitled to
claim indemnification from Sierra Pacific or any of its subsidiaries pursuant to
their respective articles of incorporation or bylaws or as provided in the
indemnification agreements listed on Section 4.10(k) of the Sierra Pacific
Disclosure Schedule.

                                      26
<PAGE>
 
          Section 4.11  Environmental Protection.

          (a) Compliance.  Except as set forth in Section 4.11(a) of the Sierra 
Pacific Disclosure Schedule, each of Sierra Pacific and its subsidiaries is in
compliance with all applicable Environmental Laws (as hereinafter defined),
except where the failure to be in compliance would not have a Sierra Pacific
Material Adverse Effect. Except as set forth in Section 4.11(a) of the Sierra
Pacific Disclosure Schedule, neither Sierra Pacific nor any of its subsidiaries
has received any written, or, to the knowledge of appropriate officers of Sierra
Pacific, upon diligent review, oral communication, from any person or
Governmental Authority that alleges that Sierra Pacific or any of its
subsidiaries is not in compliance with applicable Environmental Laws, except
where the failure to be in compliance would not have a Sierra Pacific Material
Adverse Effect.

          (b) Environmental Permits.  Except as set forth in Section 4.11(b) of
the Sierra Pacific Disclosure Schedule, each of Sierra Pacific and its
subsidiaries has obtained or has applied for all environmental, health and
safety permits and authorizations (collectively, the "Environmental Permits")
necessary for the construction of their facilities or the conduct of their
operations, and all such permits are in good standing or, where applicable, a
renewal application has been timely filed and is pending agency approval, and
Sierra Pacific is in material compliance with all terms and conditions of the
Environmental Permits and is not required to make any expenditure in order to
obtain or renew any Environmental Permit, except where the failure to obtain or
be in compliance with such Environmental Permit or the requirement to make any
expenditure in connection with such Environmental Permit would not have a Sierra
Pacific Material Adverse Effect.

          (c) Environmental Claims.  Except as set forth in Section 4.11(c) of 
the Sierra Pacific Disclosure Schedule, to the best knowledge of Sierra Pacific
upon diligent review, there is no Environmental Claim (as hereinafter defined)
pending (i) against Sierra Pacific or any of its subsidiaries or joint ventures,
(ii) against any person or entity whose liability for any Environmental Claim
Sierra Pacific or any of its subsidiaries or joint ventures has or may have
retained or assumed either contractually or by operation of law or (iii) against
any real or personal property or operations which Sierra Pacific or any of its
subsidiaries or joint ventures owns, leases or manages, in whole or in part,
which, if adversely determined, would have in the aggregate a Sierra Pacific
Material Adverse Effect.

          (d) Releases.  Except as set forth in Section 4.11(c) or Section 
4.11(d) of the Sierra Pacific Disclosure Schedule, Sierra Pacific has no
knowledge of any Releases (as hereinafter defined) or any Hazardous Material (as
hereinafter defined) that would be reasonably likely to form the basis of any
Environmental Claims against Sierra Pacific or any subsidiaries or joint
ventures of Sierra Pacific, or against any person or entity whose liability for
any Environmental Claim Sierra Pacific or any subsidiaries or joint ventures of
Sierra Pacific has or may have retained or assumed either contractually or by
operation of law, except for Releases of Hazardous Materials, the liability for
which would not have, in the aggregate, a Sierra Pacific Material Adverse
Effect.

          (e) Predecessors.  Except as set forth in Section 4.11(e) of the 
Sierra Pacific Disclosure Schedule, Sierra Pacific has no actual knowledge, with
respect to any predecessor of 

                                      27
<PAGE>
 
Sierra Pacific or any subsidiary or joint venture of Sierra Pacific, of any
Environmental Claim pending or threatened, or of any Release of Hazardous
Materials that would be reasonably likely to form the basis of any Environmental
Claim, which would have, or which Sierra Pacific reasonably believes would have,
Sierra Pacific Material Adverse Effect.

          (f) Disclosure.  To Sierra Pacific's best knowledge upon a good faith
effort, Sierra Pacific has disclosed to Nevada Power, in Section 4.11(f) of the 
Sierra Pacific Disclosure Schedule or otherwise, all material facts which Sierra
Pacific reasonably believes form the basis of a Sierra Pacific Material Adverse
Effect arising from (i) the cost of pollution control equipment currently
required or known to be required in the future; (ii) current remediation costs
or remediation costs known to be required in the future; or (iii) any other
environmental matter affecting Sierra Pacific or its subsidiaries which would
have, or which Sierra Pacific reasonably believes would have, a Sierra Pacific
Material Adverse Effect.

          (g) As used in this Agreement:

               (i) "Environmental Claim" means any and all administrative,
     regulatory or judicial actions, suits, demands, demand letters, directives,
     claims, liens, investigations, proceedings or notices of noncompliance or
     violation (written or oral) by any person or entity (including any
     Governmental Authority) alleging potential liability (including, without
     limitation, potential liability for enforcement, investigatory costs,
     cleanup costs, governmental resource costs, removal costs, remedial costs,
     natural resources damages, property damages, personal injuries, or
     penalties) arising out of, based on or resulting from (a) the presence, or
     Release or threatened Release into the environment, or any Hazardous
     Materials at any location operated, leased or managed by Sierra Pacific or
     any subsidiary or joint venture of Sierra Pacific (for purposes of this
     Section 4.11), or by Nevada Power or any of its subsidiaries or joint
     ventures (for purposes of Section 5.11) or at any other location to which
     Sierra Pacific or any subsidiary or joint venture of Sierra Pacific (for
     purposes of this Section 4.11) or Nevada Power or any subsidiary or joint
     venture of Nevada Power (for purposes of Section 5.11) sent, Released,
     disposed of or transported Hazardous Materials generated, treated, stored
     or disposed of by Sierra Pacific or any subsidiary or joint venture of
     Sierra Pacific (for purposes of this Section 4.11) or Nevada Power or any
     subsidiary or joint venture of Nevada Power (for purposes of Section 5.11);
     or (b) circumstances forming the basis of any violation; or alleged
     violation, of any Environmental Law; or (c) any and all claims by any third
     party seeking damages, contribution, indemnification, cost recovery,
     compensation or injunctive relief resulting from the presence or Release of
     any Hazardous Materials.

               (ii) "Environmental Laws" means all federal, state, local laws,
     rules and regulations relating to pollution or protection of human health
     or the environment (including, without limitation, ambient air, surface
     water, groundwater, land surface or subsurface strata), including, without
     limitation, laws and regulations relating to Releases or threatened
     Releases of Hazardous Materials, or otherwise relating to the manufacture,
     processing, distribution, use, treatment, storage, disposal, transport or
     handling of Hazardous Materials.

                                      28
<PAGE>
 
               (iii)  "Hazardous Materials" means (a) any petroleum or petroleum
     products, radioactive materials, asbestos in any form that is or could
     become friable, urea formaldehyde foam insulation, and transformers or
     other equipment that contain dielectric fluid containing polychlorinated
     biphenyls ("PCBs"); and (b) any chemicals, materials or substances which
     are now defined as or included in the definition of "hazardous substances,"
     "hazardous wastes," "hazardous materials," "extremely hazardous wastes,"
     "restricted hazardous wastes," "toxic substances," "toxic pollutants," or
     words, of similar import, under any Environmental Law; and (c) any other
     chemical, material, substance or waste, exposure to which is now
     prohibited, limited or regulated under Environmental Law in a jurisdiction
     in which Sierra Pacific or any subsidiary or joint venture of Sierra
     Pacific operates (for purposes of Section 4.11) or in which Nevada Power or
     any of its subsidiaries or joint ventures operate (for purposes of Section
     5.11).

               (iv) "Releases" means any release, spill, emission, leaking,
     injection, deposit, disposal, discharge, dispersal, leaching or migration
     into the atmosphere, soil, surface water, groundwater or property.

          Section 4.12  Regulation as a Utility.  Sierra Pacific is an exempt
public utility holding company under Section 3(a)(1) of the 1935 Act.  Sierra
Pacific Power is regulated as a public utility in the States of Nevada and
California and in no other state.  Except as set forth in the preceding sentence
and in Section 4.12 of the Sierra Pacific Disclosure Schedule, neither Sierra
Pacific nor any "subsidiary company" or "affiliate" (as those terms are defined
in the 1935 Act) of Sierra Pacific is subject to regulation as a public utility
or public service company (or similar designation) by any other state in the
United States or any foreign country.

          Section 4.13  Vote Required.  At the Sierra Pacific Special Meeting
(as hereinafter defined), Sierra Pacific will seek the approval of the First
Merger by a majority of the voting power of the holders of Sierra Pacific Common
Stock and the approval of the issuance of Sierra Pacific Common Stock in
connection with the Second Merger by a majority of the votes cast by the holders
of Sierra Pacific Common Stock, where at least a majority of all outstanding
shares of Sierra Pacific Common Stock vote on such proposal (together, the
"Sierra Pacific Stockholders' Approval"), and no other vote of the holders of
any class or series of the capital stock of Sierra Pacific is required to
approve this Agreement and the transactions contemplated hereby.

          Section 4.14  Non-applicability of Certain Nevada Law.  None of the
control share acquisition provisions of Section 78.378 et seq. of the GCL, the
business combination provisions of Section 78.411 et seq. of the GCL or any
similar provisions of the GCL, the articles of incorporation or bylaws of Sierra
Pacific are applicable to the transactions contemplated by the Agreement because
such provisions do not apply by their terms or because any required approvals of
the Board of Directors of Sierra Pacific have been obtained.

          Section 4.15  Opinion of Financial Advisor.  Sierra Pacific has
received the opinion of SG Barr Devlin to the effect that, as of the date
hereof, the Sierra Pacific Merger Consideration to be issued in the First Merger
in light of the Nevada Power Merger Consideration to be issued in the Second
Merger is fair from a financial point of view to the holders of Sierra 

                                      29
<PAGE>
 
Pacific Common Stock. Sierra Pacific has also received the opinion of Merrill
Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch"), to the effect
that, as of the date hereof, the aggregate consideration to be received by
holders of Sierra Pacific Common Stock pursuant to the transactions contemplated
by this Agreement is fair from a financial point of view to such holders.

          Section 4.16  Insurance.  Except as set forth in Section 4.16 of the 
Sierra Pacific Disclosure Schedule, each of Sierra Pacific and its subsidiaries
is, and has been continuously since January 1, 1995, insured with financially
responsible insurers in such amounts and against such risks and losses as are
customary in all material respects for companies conducting the businesses
conducted by Sierra Pacific and its subsidiaries during such time period. Except
as set forth in Schedule 4.16 of the Sierra Pacific Disclosure Schedule, neither
Sierra Pacific nor its subsidiaries have received any notice of cancellation or
termination with respect to any material insurance policy of Sierra Pacific or
its subsidiaries. All material insurance policies of Sierra Pacific and each of
its subsidiaries are valid and enforceable policies.

          Section 4.17  Ownership of Nevada Power Common Stock.  Sierra Pacific
does not "beneficially own" (as such term is defined for purposes of Section
13(d) of the Exchange Act) any shares of Nevada Power Common Stock.

          Section 4.18  Sierra Pacific Rights Agreement.  Prior hereto, Sierra
Pacific has delivered to Nevada Power and its designated counsel a true and
complete copy of the Rights Agreement, dated October 13, 1989, between Bank of
America N.T. & S.A. and Sierra Pacific (the "Sierra Pacific Rights Agreement")
in effect on the date hereof, and assuming the accuracy of the representation
contained in Section 5.17, the consummation of the transactions contemplated by
this Agreement will not result in the triggering of any right or entitlement of
Sierra Pacific stockholders under the Sierra Pacific Rights Agreement or any
similar agreement to which Sierra Pacific or any of its affiliates is a party.


                                   ARTICLE 5

                 REPRESENTATIONS AND WARRANTIES OF NEVADA POWER

          Nevada Power represents and warrants to each of Sierra Pacific, Lake
Merger Sub and Desert Merger Sub as follows:

          Section 5.1  Organization and Qualification.  Except as set forth in
Section 5.1 of the Nevada Power Disclosure Schedule (as defined in Section 
7.6(ii)), each of Nevada Power and its subsidiaries is a corporation duly
organized, validly existing and in good standing under the laws of its state of
incorporation, has all requisite corporate power and authority, and has been
duly authorized by all necessary approvals and orders of the Nevada Commission,
to own, lease and operate its assets and properties and to carry on its business
as it is now being conducted, and is duly qualified and in good standing to do
business in each jurisdiction in which the nature of its business or the
ownership or leasing of its assets and properties makes such qualification
necessary other than in such jurisdictions where the failure to be so qualified
and in good standing

                                      30
<PAGE>
 
will not, when taken together with all other such failures, have a material
adverse effect on the business, operations, assets, financial condition or the
result of operations of Nevada Power and its subsidiaries taken as a whole or on
the consummation of this Agreement (any such material adverse effect being
hereinafter referred to as a "Nevada Power Material Adverse Effect").

          Section 5.2  Subsidiaries.  Section 5.2 of the Nevada Power Disclosure
Schedule sets forth a description of all subsidiaries and joint ventures of
Nevada Power, including the name of each such entity, the state of jurisdiction
of its incorporation or formation, a brief description of the principal line or
lines of business conducted by each such entity and Nevada Power's interest
therein.  Except as set forth in Section 5.2 of the Nevada Power Disclosure
Schedule, none of such entities 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)(7), 2(a)(8) or 2(a)(11),
respectively, of the 1935 Act.  Except as set forth in Section 5.2 of the Nevada
Power Disclosure Schedule, all of the issued and outstanding shares of capital
stock or other securities of, or interests in, each subsidiary or joint venture
of  Nevada Power are validly issued, fully paid, nonassessable and free of
preemptive rights, are owned directly or indirectly by Nevada Power free and
clear of any liens, claims, encumbrances, security interests, equities, charges
and options of any nature whatsoever, and there are no outstanding
subscriptions, options, calls, contracts, voting trusts, proxies or other
commitments, understandings, restrictions, arrangements, rights or warrants,
including any right of conversion or exchange under any outstanding security,
instrument or other agreement, obligating any such subsidiary to issue, deliver
or sell, or cause to be issued, delivered or sold, additional shares of its
capital stock or obligating it to grant, extend or enter into any such agreement
or commitment.

          Section 5.3  Capitalization.  The authorized capital stock of Nevada
Power consists of 70,000,000 shares of Nevada Power Common Stock, 4,500,000
shares of Nevada Power Cumulative Preferred Stock, par value $20 per share
("Nevada Power Preferred Stock"), and 1,000,000 shares of  preference stock, par
value $20 per share ("Nevada Power Preference Stock").  As of the close of
business on April 28, 1998, (i) 50,766,586 shares of Nevada Power Common Stock,
(ii) 179,245 shares of Nevada Power Preferred Stock (consisting of 108,006
shares of the 4.70% series, 34,570 shares of the 5.20% series, and 36,669 shares
of the 5.40% series) and (iii) no shares of Nevada Power Preference Stock were
issued and outstanding.  Prior to the Effective Time of the Second Merger, all
shares of Nevada Power Preferred Stock will be redeemed or otherwise retired in
accordance with their terms.  As of the date hereof, Nevada Power Capital I, a
wholly-owned subsidiary of Nevada Power, had 4,901,918 8.2% Cumulative Quarterly
Income Preferred Securities  issued and outstanding, 147,058 of which are owned
by Nevada Power, and 147,058 Series A Common Securities issued and outstanding,
all of which are owned by Nevada Power.  All of the issued and outstanding
shares of the capital stock of Nevada Power are validly issued, fully paid,
nonassessable and free of preemptive rights. Except as set forth in Section 5.3
of the Nevada Power Disclosure Schedule, there are no outstanding subscriptions,
options, calls, contracts, voting trusts, proxies or other commitments,
understandings, restrictions, arrangements, rights or warrants, including any
right of conversion or exchange under any outstanding security, instrument or
other agreement, obligating Nevada Power or any of its subsidiaries to issue,
deliver or sell, or cause to be issued, delivered or sold, additional shares of
the capital stock of Nevada Power, or obligating Nevada Power or any of its

                                      31
<PAGE>
 
subsidiaries to grant, extend or enter into any such agreement or commitment
other than the Nevada Power Rights Agreement.

          Section 5.4  Authority; Non-Contravention; Statutory Approvals;
Compliance.

          (a) Authority.  Nevada Power has all requisite power and authority to
enter into this Agreement and, subject to the applicable Nevada Power
Stockholders' Approval (as defined in Section 5.13) and the applicable Nevada 
Power Required Statutory Approvals (as hereinafter defined), to consummate the
transactions contemplated hereby.  The execution and delivery of this Agreement
and the consummation by Nevada Power of the transactions contemplated hereby
have been duly authorized by all necessary corporate action on the part of
Nevada Power, subject to obtaining the applicable Nevada Power Stockholders'
Approval.  This Agreement has been duly and validly executed and delivered by
Nevada Power and, assuming the due authorization, execution and delivery hereof
by each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub, constitutes
the valid and binding obligation of Nevada Power enforceable against it in
accordance with its terms.

          (b) Non-Contravention.  The execution and delivery of this Agreement
by Nevada Power do not, and the consummation of the transactions contemplated
hereby will not, violate, conflict with, or result in a breach of any provision
of, or constitute a default (with or without notice or lapse of time or both)
under, or result in any Violation by Nevada Power or any of its subsidiaries or
joint ventures pursuant to any provisions of (i) the articles of incorporation,
bylaws or similar governing documents of Nevada Power or any of its subsidiaries
or joint ventures, (ii) subject to obtaining the Nevada Power Required Statutory
Approvals and the receipt of the Nevada Power Stockholders' Approval, any
statute, law, ordinance, rule, regulation, judgment, decree, order, injunction,
writ, permit or license of any Governmental Authority applicable to Nevada Power
or any of its subsidiaries or joint ventures, or any of its respective
properties or assets, or (iii) subject to obtaining the third-party consents or
other approvals set forth in Section 5.4(b) of the Nevada Power Disclosure
Schedule (the "Nevada Power Required Consents"), any note, bond, mortgage,
indenture, deed of trust, license, franchise, permit, concession, contract,
lease or other instrument, obligation or agreement of any kind to which Nevada
Power or any of its subsidiaries or any joint venture of Nevada Power is now a
party or by which it or any of its properties or assets may be bound or
affected, excluding from the foregoing clauses (ii) and (iii) such Violations
that would not, in the aggregate, have a Nevada Power Material Adverse Effect.

          (c) Statutory Approvals.  Except as described in Section 5.4(c) of the
Nevada Power Disclosure Schedule, no declaration, filing or registration with,
or notice to or authorization, consent or approval of, any Governmental
Authority is necessary for the execution and delivery of this Agreement by
Nevada Power or the consummation by Nevada Power of the transaction contemplated
hereby, the failure of which to obtain, make or give would have, in the
aggregate, a Nevada Power Material Adverse Effect (the "Nevada Power Required
Statutory Approvals," it being understood that references in this Agreement to
"obtaining" such Nevada Power Required Statutory Approvals shall mean making
such declarations, filings or registrations, giving such notices, obtaining such
authorizations, consents or approvals, and having such waiting periods expire as
are necessary to avoid a violation of law).

                                      32
<PAGE>
 
          (d) Compliance.  Except as set forth in Section 5.4(d) or Section 5.11
of the Nevada Power Disclosure Schedule or as disclosed in the Nevada Power SEC
Reports (as defined in Section 5.5), neither Nevada Power nor any of its
subsidiaries nor, to the knowledge of Nevada Power, any of its joint ventures,
is in violation of, or is under investigation with respect to, or has been given
notice or been charged with any violation of, any law, statute, order, rule,
regulation, ordinance or judgment (including, without limitation, applicable
Environmental Laws) of any Governmental Authority, except for violations which,
in the aggregate do not have, and, to the knowledge of Nevada Power, are not
reasonably likely to have, a Nevada Power Material Adverse Effect. Except as set
forth in Section 5.4(d) or Section 5.11 of the Nevada Power Disclosure Schedule,
Nevada Power and each of its subsidiaries and joint ventures have all permits,
licenses, franchises and other governmental authorizations, consents and
approvals necessary to conduct their businesses as currently conducted except
those of which the failure to obtain would not, individually or in the
aggregate, have a Nevada Power Material Adverse Effect. Except as set forth in
Section 5.4(d) of the Nevada Power Disclosure Schedule, neither Nevada Power or
any of its subsidiaries nor, to the knowledge of Nevada Power, any joint venture
of Nevada Power is in breach or violation of or in default in the performance or
observance of any term or provision of, and no event has occurred which, with
lapse of time or action by a third party or both could result in a default by
Nevada Power or any Nevada Power subsidiary or, to the knowledge of Nevada
Power, any joint venture of Nevada Power under (i) its articles of incorporation
or bylaws or (ii) any contract, commitment, agreement, indenture, mortgage, loan
agreement, note, lease, bond, license, approval or other instrument to which it
is a party or by which Nevada Power or any subsidiary or joint venture of Nevada
Power is bound or to which any of its property is subject, except for possible
violations, breaches or defaults which individually or in the aggregate would
not have a Nevada Power Material Adverse Effect.

          Section 5.5  Reports and Financial Statements.  Since January 1,
1995, the filings required to be made by Nevada Power and its subsidiaries under
the Securities Act, the Exchange Act, applicable Nevada laws and regulations
regulating public utilities, the Power Act or the 1935 Act have been filed with
the SEC, the Nevada Commission or the FERC, as the case may be, including all
forms, statements, reports, agreements (oral or written) and all documents,
exhibits, amendments and supplements appertaining thereto, and complied in all
material respects with all applicable requirements of the appropriate act and
the rules and regulations thereunder.  Nevada Power has made available to Sierra
Pacific a true and complete copy of each report, schedule, registration
statement and definitive proxy statement filed by Nevada Power with the SEC
since January 1, 1995 (as such documents have since the time of their filing
been amended, the "Nevada Power SEC Reports").  As of their respective dates,
the Nevada Power SEC Reports did not contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein, in light of the circumstances under which they
were made, not misleading.  The audited consolidated financial statements and
unaudited interim financial statements of Nevada Power included in the Nevada
Power SEC Reports (collectively, the "Nevada Power Financial Statements") have
been prepared in accordance with GAAP (except as may be indicated therein or in
the notes thereto and except with respect to unaudited statements as permitted
by Form 10-Q of the SEC) and fairly present the financial position of Nevada
Power and its subsidiaries as of the dates thereof and the results of its
operations and cash flows for the periods then ended, subject, in the case of
the unaudited interim financial statements, to normal recurring audit
adjustments. True, accurate and complete

                                      33
<PAGE>
 
copies of the articles of incorporation and bylaws of Nevada Power as in effect
on the date hereof have been delivered to Sierra Pacific.

          Section 5.6  Absence of Certain Changes or Events; Absence of
Undisclosed Liabilities.  (a) Except as set forth in the Nevada Power SEC
Reports or Section 5.6 of the Nevada Power Disclosure Schedule, from December
31, 1997, through the date hereof, each of Nevada Power and its subsidiaries has
conducted its business only in the ordinary course of business consistent with
past practice and there has not been, and no fact or condition exists which
would have or, to the knowledge of Nevada Power, is reasonably likely to have, a
Nevada Power Material Adverse Effect.

          (b) Neither Nevada Power nor any of its subsidiaries has any
liabilities or obligations (whether absolute, accrued, contingent or otherwise)
of a nature required by GAAP to be reflected in a consolidated corporate balance
sheet, except liabilities, obligations or contingencies that are accrued or
reserved against in the consolidated financial statements of Nevada Power or
reflected in the notes thereto for the year ended December 31, 1997, or which
were incurred after December 31, 1997 in the ordinary course of business and
would not, in the aggregate, have a Nevada Power Material Adverse Effect.

          Section 5.7  Litigation.  Except as disclosed in the Nevada Power
SEC Reports or as set forth in Section 5.7 or Section 5.11 of the Nevada Power
Disclosure Schedule, (i) there are no claims, suits, actions or proceedings,
pending or, to the knowledge of Nevada Power, threatened, nor are there, to the
knowledge of Nevada Power, any investigations or reviews pending or threatened
against, relating to or affecting Nevada Power or any of its subsidiaries and
(ii) there are no judgments, decrees, injunctions, rules or orders of any court,
governmental department, commission, agency, instrumentality or authority or any
arbitrator applicable to Nevada Power or any of its subsidiaries, which, when
taken together with any of the matters described in clauses (i) or (ii), would
have, or to the knowledge of Nevada Power is reasonably likely to have, a Nevada
Power Material Adverse Effect.  In addition, except as disclosed in the Nevada
Power SEC Reports or as set forth in Section 5.7 or Section 5.11 of the Nevada
Power Disclosure Schedule, there have not been any developments since December
31, 1997, with respect to such disclosed claims, suits, actions, proceedings,
investigations or reviews, which, in the aggregate, would have, or to the
knowledge of Nevada Power is reasonably likely to have, a Nevada Power Material
Adverse Effect.

          Section 5.8  Registration Statement and Proxy Statement.  None of
the information supplied or to be supplied by or on behalf of Nevada Power for
inclusion or incorporation by reference in (i) the Registration Statement will,
at the time the Registration Statement is filed with the SEC and at the time it
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading and (ii) the Proxy
Statement will not, at the dates mailed to stockholders and at the times of the
meetings of stockholders to be held in connection with the Mergers, 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 

                                      34
<PAGE>
 
misleading. The Registration Statement and the Proxy Statement, insofar as they
relate to Nevada Power or any of its subsidiaries, will comply as to form in all
material respects with the applicable provisions of the Securities Act and the
Exchange Act and the rules and regulations thereunder.

          Section 5.9  Tax Matters.

          (a) Filing of Timely Tax Returns.  Nevada Power and each of its
subsidiaries have filed all Tax Returns required to be filed by each of them
under applicable law.  All Tax Returns were in all material respects (and, as to
Tax Returns not filed as of the date hereof, will be) true, complete and correct
and filed on a timely basis.

          (b) Payment of Taxes.  Nevada Power and each of its subsidiaries have,
within the time and in the manner prescribed by law, paid (and until the Closing
Date will pay within the time and in the manner prescribed by law) all Taxes
that are currently due and payable except for those contested in good faith and
for which adequate reserves have been taken.

          (c) Tax Liens.  There are no material Tax liens upon the assets of
Nevada Power or any of its subsidiaries except liens for Taxes not yet due.

          (d) Withholding Taxes.  Nevada Power and each of its subsidiaries have
complied (and until the Closing Date will comply) in all respects with the
provisions of the Code relating to the payment and withholding of Taxes,
including, without limitation, the withholding and reporting requirements under
Code (S) 1441 through 1464, 3401 through 3606, and 6041 and 6049, as well as
similar provisions under any other laws, and have, within the time and in the
manner prescribed by law, withheld from employee wages and paid over to the
proper governmental authorities all amounts required.

          (e) Extensions of Time for Filing Tax Returns.  Except as set forth in
Section 5.9(e) of the Nevada Power Disclosure Schedule, neither Nevada Power nor
any of its subsidiaries has requested any extension of time within which to file
any Tax Return, which Tax Return has not since been filed.

          (f) Waivers of Statute of Limitations.  Except as set forth in Section
5.9(f) of the Nevada Power Disclosure Schedule, neither Nevada Power nor any of
its subsidiaries has executed any outstanding waivers or comparable consents
regarding the application of the statute of limitations with respect to any
Taxes or Tax Returns.

          (g) Expiration of Statute of Limitations.  Except as set forth in
Section 5.9(g) of the Nevada Power Disclosure Schedule, the statute of
limitations for the assessment of all Taxes has expired for all applicable Tax
Returns of Nevada Power and each of its subsidiaries or those Tax Returns have
been examined by the appropriate taxing authorities for all periods through the
date hereof, and no deficiency for any Taxes has been proposed, asserted or
assessed against Nevada Power or any of its subsidiaries that has not been
resolved and paid in full.

          (h) Audit, Administrative and Court Proceedings.  Except as set forth
in Section 5.9(h) of the Nevada Power Disclosure Schedule, no audits or other
administrative 

                                      35
<PAGE>
 
proceedings or court proceedings are presently pending, and no material issue
raised remains unsettled, with regard to any Taxes or Tax Returns of Nevada
Power or any of its subsidiaries.

          (i) Power of Attorney.  Except as set forth in Section 5.9(i) of the 
Nevada Power Disclosure Schedule, no power of attorney currently in force has
been granted by Nevada Power or any of its subsidiaries concerning any Tax
matter.

          (j) Tax Rulings.  Except as set forth in Section 5.9(j) of the Nevada 
Power Disclosure Schedule, neither Nevada Power nor any of its subsidiaries has
received a Tax Ruling or entered into a Closing Agreement with any taxing
authority that would have a continuing adverse effect after the Closing Date.

          (k) Availability of Tax Returns.  As soon as practicable after the
date hereof, Nevada Power and its subsidiaries will make available to Sierra
Pacific and SPC complete and accurate copies of (i) all Tax Returns, and any
amendments thereto, filed by Nevada Power or any of its subsidiaries since
January 1, 1990, (ii) all audit reports received from any taxing authority
relating to any Tax Return filed by Nevada Power or any of its subsidiaries and
(iii) any Closing Agreement entered into by Nevada Power or any of its
subsidiaries with any taxing authority.

          (l) Tax Sharing Agreements.  Except as disclosed in Section 5.9(l) of 
the Nevada Power Disclosure Schedule, no agreements relating to allocating or
sharing of Taxes exist between or among Nevada Power and any of its
subsidiaries.

          (m) Code (S) 341(f).  Neither Nevada Power nor any of its
subsidiaries has filed (or will file prior to the Closing) a consent pursuant to
Code (S) 341(f) or has agreed to have Code (S) 341(f)(2) apply to any
disposition of a subsection (f) asset (as that term is defined in Code (S)
341(f)(4)) owned by Nevada Power or any of its subsidiaries.

          (n) Code (S) 168.  Except as set forth in Section 5.9(n) of the Nevada
Power Disclosure Schedule, no property of Nevada Power or any of its
subsidiaries is property that Nevada Power or any such subsidiary or any party
to this transaction is or will be required to treat as being owned by another
person pursuant to the provisions of Code (S) 168(f)(8) (as in effect prior to
its amendment by the Tax Reform Act of 1986) or is "tax-exempt use property"
within the meaning of Code (S) 168.

          (o) Code (S) 481 Adjustments.  Except as set forth in Section 5.9(o)
of the Nevada Power Disclosure Schedule, neither Nevada Power nor any of its
subsidiaries is required to include in income any adjustment pursuant to Code
(S) 481(a) by reason of a voluntary change in accounting method initiated by
Nevada Power or any of its subsidiaries, and to the best of the knowledge of
Nevada Power, the IRS has not proposed any such adjustment or change in
accounting method.

          (p) Code (S) 6661 and (S) 6662.  All transactions that could give rise
to an understatement of federal income tax (within the meaning of Code (S) 6661
or Code (S) 6662) that could reasonably be expected to result in a Nevada Power
Material Adverse Effect have been adequately disclosed (or, with respect to Tax
Returns filed following the Closing will be 

                                      36
<PAGE>
 
adequately disclosed) on the Tax Return of Nevada Power and its subsidiaries in
accordance with Code 6661(h)(2)(B) or Code 6662(d)(2)(B).

          (q) Code (S) 280G.  Except as set forth in Section 5.9(q) of the
Nevada Power Disclosure Schedule, neither Nevada Power nor any of its
subsidiaries is a party to any agreement, contract, or arrangement that could
result, on account of the transactions contemplated hereunder, separately or in
the aggregate, in the payment of any "excess parachute payments" within the
meaning of the Code (S) 280G.

          (r) Liability for Others.  Neither Nevada Power nor any of its
subsidiaries has any liability for Taxes of any person other than Nevada Power
and its subsidiaries under Treasury Regulations Section 1.1502-6 (or any similar
provision of state, local or foreign law) as a transferee or successor, by
contract, or otherwise.

          Section 5.10  Employee Matters; ERISA.

          (a) Benefit Plans.  Section 5.10(a) of the Nevada Power Disclosure 
Schedule contains a true and complete list of each employee benefit plan,
program or arrangement sponsored, maintained or contributed to by and covering
employees, former employees, directors or former directors of Nevada Power (or
any of its subsidiaries or any other entity which would be treated under Section
414 of the Code as a single employer with Nevada Power) or any of their
dependents or beneficiaries, or providing benefits to such persons in respect of
services provided to any such entity including, but not limited to, any employee
benefit plans within the meaning of Section 3(3) of ERISA, any management,
employment, deferred compensation, severance (including any payment, right or
benefit resulting from a change in control), bonus or other contract for
personal services with any current or former officer, director or employee, any
consulting contract with any person who prior to entering into such contract was
a director or officer of Nevada Power or any of its subsidiaries or any plan,
agreement, arrangement or understanding similar to any of the foregoing
(collectively, the "Nevada Power Benefit Plans"). None of the Nevada Power
Benefit Plans is a multiemployer plan within the meaning of ERISA.

          (b) Contributions.  Except as set forth in Section 5.10(b) of the 
Nevada Power Disclosure Schedule, all contributions and other payments required
to have been made by Nevada Power or any of its subsidiaries (including any pre-
or post-tax contributions or payments by employees or their dependents) to any
Nevada Power Benefit Plan (or to any person pursuant to the terms thereof) have
been so made or the amount of such payment or contribution obligations has been
reflected in the Nevada Power Financial Statements.

          (c) Qualification; Compliance.  Except as set forth in Section 5.10(c)
of the Nevada Power Disclosure Schedule, each of the Nevada Power Benefit Plans
that are intended to be "qualified" within the meaning of Code (S) 401(a) has
been determined by the IRS to be so qualified, and, to the best knowledge of
Nevada Power, no circumstances exist that are reasonably expected by Nevada
Power to result in the revocation of any such determination. Nevada Power is not
in noncompliance in any respect with, and no Nevada Power Benefit Plan is or has
been operated in noncompliance with its terms and with, any applicable law, rule
or regulation 

                                      37
<PAGE>
 
governing such plan, including, without limitation, ERISA and the Code, which
would have a Nevada Power Material Adverse Effect.

          (d) Liabilities.  With respect to the Nevada Power Benefit Plans,
individually and in the aggregate, no event has occurred, and, to the best
knowledge of Nevada Power, there exists no condition or set of circumstances
that could subject Nevada Power or any of its subsidiaries to any liability
arising under the Code, ERISA or any other applicable law (including, without
limitation, any liability to any such plan or the PBGC), or under any indemnity
agreement to which Nevada Power is a party, which liability, excluding liability
for benefit claims and funding obligations payable in the ordinary course and
liability for premiums due to the PBGC, would have, or insofar as reasonably can
be foreseen, could have, a Nevada Power Material Adverse Effect.

          (e) Welfare Plans.  Except as set forth in Section 5.10(e) of the
Nevada Power Disclosure Schedule, none of the Nevada Power Benefit Plans that
are "welfare plans," within the meaning of Section 3(1) of ERISA, provides for
any retiree benefits.

          (f) Documents Made Available.  Nevada Power has made available to
Sierra Pacific a true and correct copy of each collective bargaining agreement
to which Nevada Power is a party or under which Nevada Power has obligations,
and with respect to each Nevada Power Benefit Plan, (i) such plan and the most
recent summary plan description, (ii) the most recent annual report filed with
the IRS, (iii) each related trust agreement, insurance contract, service
provider or investment management agreement (including all amendments to each
such document), (iv) the most recent determination of the IRS with respect to
the qualified status of such plan, and (v) the most recent actuarial report or
valuation.

          (g) Payments Resulting from Merger.  Other than as set forth in
Section 7.11 or in Section 5.10(g) of the Nevada Power Disclosure Schedule, the
consummation, announcement or other action relating to any transactions
contemplated by this Agreement will not (either alone or upon the occurrence of
any additional or further acts or events) result in any (A) payment (whether of
severance pay or otherwise) becoming due from Nevada Power or any of its
subsidiaries to any officer, employee, former employee, director or former
director thereof or to the trustee under any "rabbi trust" or similar
arrangement, or (B) benefit under any Nevada Power Benefit Plan being
established or becoming accelerated, vested or payable.

          (h) Funded Status of Plans.  Except as set forth in Section 5.10(h) of
the Nevada Power Disclosure Schedule, the failure of any Nevada Power Benefit
Plan which is subject to the requirements of Code (S) 412, part 3 of Title 1 of
ERISA or Title IV of ERISA to hold assets, the fair market value of which, as of
the date thereof, are at least equal in value to the greatest of the projected
benefit obligations, the accumulated benefit obligations or accrued benefit
obligations (each determined as of the date hereof) of the participants and
beneficiaries under such plan, based on actuarial methods, tables and
assumptions theretofore utilized by such plan's actuary to determine the plan's
funded status would not give rise to a Nevada Power Material Adverse Effect.

                                      38
<PAGE>
 
          (i) Certain Other Obligations.  Except as set forth in Section 5.10(i)
of the Nevada Power Disclosure Schedule, the termination of, or withdrawal from,
any employee pension benefit plan within the meaning of (S) 3(2) of ERISA
(including any single employer, multiple employer or multiemployer plan) or
subject to Title IV of ERISA by Nevada Power or any corporation or other entity
which is, or at any time was, a subsidiary of Nevada Power or would be treated
under Section 414 of the Code as a single employer with Nevada Power has not,
and will not, subject Nevada Power (or any subsidiary of Nevada Power) to any
liability of or to any governmental authority, corporation or other person or
such employee pension plan which individually or in the aggregate would have a
Nevada Power Material Adverse Effect.

          (j) Modification or Termination of Plans.  Except as set forth in
Section 5.10(j) of the Nevada Power Disclosure Schedule: (A) neither Nevada 
Power nor any subsidiary of Nevada Power is subject to any legal, contractual,
equitable or other obligation to establish or contribute to as of any date any
new Nevada Power Benefit Plan or amend any existing Nevada Power Benefit Plan;
and (B) to the best knowledge of Nevada Power and each of its subsidiaries after
review of all plan documents, Nevada Power and each of its subsidiaries may
(except to the extent prohibited by applicable law), in any manner, and without
the consent of any employee, beneficiary or dependent, employees' organization
or other person, terminate, modify or amend each Nevada Power Benefit Plan (or
its participation in any such Nevada Power Benefit Plan) at any time sponsored,
maintained or contributed to by Nevada Power or any of its subsidiaries
effective as of any date before, on or after the Effective Time.

          (k) Labor Agreements.  Except as disclosed in the Nevada Power SEC
Reports or as set forth in Section 5.10(k) of the Nevada Power Disclosure 
Schedule: (i) neither Nevada Power nor any of its subsidiaries is a party to any
collective bargaining agreement or other labor agreement with any union or labor
organization; (ii) to the best knowledge of Nevada Power and its subsidiaries,
there is no current union representation question involving employees of Nevada
Power (or any of its subsidiaries), nor does Nevada Power or any of its
subsidiaries know of any activity or proceeding of any labor organizations (or
representative thereof) or employee group (or representative thereof) to
organize any such employees; (iii) there is no unfair labor practice, charge or
written grievance arising out of a collective bargaining agreement or other
grievance procedure against Nevada Power or any of its subsidiaries pending, or
to the best knowledge of Nevada Power or any of its subsidiaries, threatened,
which has, or reasonably may be expected by Nevada Power or any of its
subsidiaries to have, a Nevada Power Material Adverse Effect; (iv) there is no
complaint, lawsuit or proceeding in any forum by or on behalf of any present or
former employee, any applicant for employment or classes of the foregoing
alleging breach of any express or implied contract of employment, any law or
regulation governing employment or the termination thereof or other
discriminatory, wrongful or tortious conduct in connection with the employment
relationship against Nevada Power or any of its subsidiaries, or to the best
knowledge of Nevada Power or any of its subsidiaries, threatened, which has, or
reasonably may be expected by Nevada Power or any of its subsidiaries to have, a
Nevada Power Material Adverse Effect; (v) there is no strike, dispute, slowdown,
work stoppage or lockout pending, or, to the best knowledge of Nevada Power or
any of its subsidiaries, threatened, against or involving Nevada Power or any of
its subsidiaries which has or, insofar as reasonably can be foreseen, could
have, a Nevada Power Material Adverse Effect; (vi) Nevada Power and its
subsidiaries are in compliance with all applicable laws respecting employment
and employment

                                      39
<PAGE>
 
practices, terms and conditions of employment, wages, hours of work and
occupational safety and health, except for noncompliance which, in the
aggregate, does not, and insofar as reasonably can be foreseen, will not, have a
Nevada Power Material Adverse Effect; and (vii) there is no proceeding, claim,
suit, action or governmental investigation pending or, to the best knowledge of
Nevada Power and its subsidiaries, threatened, in respect of which any director,
officer, employee or agent of Nevada Power or any of its subsidiaries is or may
be entitled to claim indemnification from Nevada Power pursuant to its articles
of incorporation or regulations or as provided in the indemnification agreements
listed on Section 5.10(k) of the Nevada Power Disclosure Schedule.

          Section 5.11  Environmental Protection.

          (a) Compliance.  Except as set forth in Section 5.11(a) of the Nevada 
Power Disclosure Schedule, each of Nevada Power and its subsidiaries is in
compliance with all applicable Environmental Laws, except where the failure to
be in compliance would not have a Nevada Power Material Adverse Effect. Except
as set forth in Section 5.11(a) of the Nevada Power Disclosure Schedule, neither
Nevada Power nor any of its subsidiaries has received any written, or, to the
knowledge of appropriate officers of Nevada Power upon diligent review, oral
communication, from any person or Governmental Authority, that alleges that
Nevada Power or any of its subsidiaries is not in compliance with applicable
Environmental Laws, except where the failure to be in compliance would not have
a Nevada Power Material Adverse Effect.

          (b) Environmental Permits.  Except as set forth in Section 5.11(b) of
the Nevada Power Disclosure Schedule, each of Nevada Power and its subsidiaries
has obtained or has applied for all Environmental Permits necessary for the
construction of their facilities or the conduct of their operations, and all
such permits are in good standing or, where applicable, a renewal application
has been timely filed and is pending agency approval, and Nevada Power is in
material compliance with all terms and conditions of the Environmental Permits
and is not required to make any expenditure in order to obtain or renew any
Environmental Permit, except where the failure to obtain or be in compliance
with the Environmental Permit or the requirement to make any expenditure in
connection with such Environmental Permit would not have a Nevada Power Material
Adverse Effect.

          (c) Environmental Claims.  Except as set forth in Section 5.11(c) of 
the Nevada Power Disclosure Schedule, to the best knowledge of Nevada Power upon
diligent review, there is no Environmental Claim pending (i) against Nevada
Power or any of its subsidiaries or joint ventures, (ii) against any person or
entity whose liability for any Environmental Claim Nevada Power or any of its
subsidiaries or joint ventures has or may have retained or assumed either
contractually or by operation of law, or (iii) against any real or personal
property or operations which Nevada Power or any of its subsidiaries or joint
ventures owns, leases or manages, in whole or in part, which if adversely
determined, would have in the aggregate a Nevada Power Material Adverse Effect.

          (d) Releases.  Except as set forth in Section 5.11(c) or Section 
5.11(d) of the Nevada Power Disclosure Schedule, Nevada Power has no knowledge
of any Releases of any Hazardous Material that would be reasonably likely to
form the basis of any Environmental Claim against Nevada Power or any of its
subsidiaries or joint ventures, or against any person or entity 

                                      40
<PAGE>
 
whose liability for any Environmental Claim Nevada Power or any of its
subsidiaries or joint ventures has or may have retained or assumed either
contractually or by operation of law, except for Releases of Hazardous
Materials, the liability for which would not have, in the aggregate, a Nevada
Power Material Adverse Effect.

          (e) Predecessors.  Except as set forth in Section 5.11(e) of the 
Nevada Power Disclosure Schedule, Nevada Power has no actual knowledge, with
respect to any predecessor of Nevada Power or any of its subsidiaries or joint
ventures, of any Environmental Claim pending or threatened, or of any Release of
Hazardous Materials that would be reasonably likely to form the basis of any
Environmental Claim, which would have, or which Nevada Power reasonably believes
would have, a Nevada Power Material Adverse Effect.

          (f) Disclosure.  To Nevada Power's best knowledge upon a good faith
effort, Nevada Power has disclosed to Sierra Pacific, in Section 5.11(f) of the
Nevada Power Disclosure Schedule or otherwise, all material facts which Nevada
Power reasonably believes form the basis of a Nevada Power Material Adverse
Effect arising from (i) the cost of pollution control equipment currently
required or known to be required in the future; (ii) current remediation costs
or remediation costs known to be required in the future; or (iii) any other
environmental matter affecting Nevada Power or its subsidiaries which would
have, or which Nevada Power reasonably believes would have, a Nevada Power
Material Adverse Effect.

          Section 5.12  Regulation as a Utility.  Nevada Power is regulated as
a public utility in the State of Nevada and in no other state.  Except as set
forth in the preceding sentence and in Section 5.12 of the Nevada Power
Disclosure Schedule, neither Nevada Power nor any "subsidiary company" or
"affiliate" of Nevada Power is subject to regulation as a public utility or
public service company (or similar designation) by any other state in the United
States or any foreign country.

          Section 5.13  Vote Required.  The approval of the Second Merger by a
majority of the voting power of the holders of Nevada Power Common Stock (the
"Nevada Power Stockholders' Approval") is the only vote of the holders of any
class or series of the capital stock of Nevada Power required to approve this
Agreement and the transactions contemplated hereby.

          Section 5.14  Non-applicability of Certain Nevada Law.  None of the
control share acquisition provisions of Section 78.378 et seq. of the GCL, the
business combination provisions of Section 78.411 et seq. of the GCL or any
similar provisions of the GCL, the articles of incorporation or bylaws of Nevada
Power are applicable to the transactions contemplated by the Agreement because
such provisions do not apply by their terms or because any required approvals of
the Board of Directors of Nevada Power have been obtained.

          Section 5.15  Opinion of Financial Advisor.  Nevada Power has
received the opinion of PaineWebber Incorporated, to the effect that, as of the
date hereof, the Nevada Power Merger Consideration to be received in connection
with the Mergers is fair from a financial point of view to the holders of Nevada
Power Common Stock.

                                      41
<PAGE>
 
          Section 5.16  Insurance.  Except as set forth in Section 5.16 of the
Nevada Power Disclosure Schedule, each of Nevada Power and its subsidiaries is,
and has been continuously since  January 1, 1995, insured with financially
responsible insurers in such amounts and against such risks and losses as are
customary in all material respects for companies conducting the businesses
conducted by Nevada Power and its subsidiaries during such time period.  Except
as set forth in Schedule 5.16 of the Nevada Power Disclosure Schedule neither
Nevada Power nor its subsidiaries has received any notice of cancellation or
termination with respect to any material insurance policy of Nevada Power or its
subsidiaries. All material insurance policies of Nevada Power and each of its
subsidiaries are valid and enforceable policies.

          Section 5.17  Ownership of Sierra Pacific Common Stock.  Nevada Power
does not "beneficially own" (as such term is defined for purposes of Section
13(d) of the Exchange Act) any shares of Sierra Pacific Common Stock.

          Section 5.18  Nevada Power Rights Agreement.  Prior hereto, Nevada
Power has delivered to Sierra Pacific and its designated counsel a true and
complete copy of the Rights Agreement, dated October 15, 1990, between
Manufacturers Hanover Trust Company and Nevada Power (the "Nevada Power Rights
Agreement") in effect on the date hereof, and assuming the accuracy of the
representation contained in Section 4.17, the consummation of the transactions
contemplated by this Agreement will not result in the triggering of any right or
entitlement of Nevada Power stockholders under the Nevada Power Rights Agreement
or any similar agreement to which Nevada Power or any of its affiliates is a
party.


                                   ARTICLE 6

                     CONDUCT OF BUSINESS PENDING THE MERGER

          Section 6.1  Covenants of The Parties.  After the date hereof and
prior to the Effective Time or earlier termination of this Agreement, Nevada
Power and Sierra Pacific each agrees as to itself and its subsidiaries, except
as expressly contemplated or permitted in this Agreement, or to the extent the
other parties hereto shall otherwise consent in writing:

          (a) Ordinary Course of Business.  Each party hereto shall, and shall
cause its respective subsidiaries to, carry on their respective businesses in
the usual, regular and ordinary course in substantially the same manner as
heretofore conducted and use all commercially reasonable efforts to preserve
intact their present business organizations and goodwill, preserve the goodwill
and relationships with customers, suppliers and others having business dealings
with them and, subject to prudent management of workforce needs and ongoing
programs currently in force, keep available the services of their present
officers and employees. Except as set forth in Section 6.1(a) of the Sierra
Pacific Disclosure Schedule or the Nevada Power Disclosure Schedule, no party
shall, nor shall any party permit any of its subsidiaries to, enter into a new
line of business, or make any change in the line of business it engaged in as of
the date hereof involving any material investment of assets or resources or any
material exposure to liability or loss, in the case of Sierra Pacific, to Sierra
Pacific and its subsidiaries taken as a whole, and in the case of Nevada Power,
to Nevada Power and its subsidiaries taken as a whole.

                                      42
<PAGE>
 
          (b) Dividends.  No party shall, nor shall any party permit any of its
subsidiaries to (i) declare or pay any dividends on or make other distributions
in respect of any of their capital stock other than to such party or its wholly-
owned subsidiaries and other than dividends required to be paid on any series of
Nevada Power Preferred Stock, Sierra Pacific Power Preferred Stock and Sierra
Pacific Power Class A Preferred Stock in accordance with the terms thereof,
regular quarterly dividends on Nevada Power Common Stock with usual record and
payment dates in an amount not in excess of $0.40 per share payable on or about
May 1, 1998, not in excess of $0.40 per share payable on or about August 3,
1998, and thereafter not in excess of $0.25 per share and regular quarterly
dividends on Sierra Pacific Common Stock with usual record and payment dates in
an amount declared in any period of February 1 through the following January 31
not in excess of 105% of the dividends per share declared during the immediately
preceding February 1 through January 31 period; (ii) split, combine or
reclassify any of their capital stock or issue or authorize or propose the
issuance of any other securities in respect of, in lieu of, or in substitution
for, shares of its capital stock; or (iii) redeem, repurchase or otherwise
acquire any shares of their capital stock, other than redemptions, purchases or
acquisitions required by the respective terms of any series of Nevada Power
Preferred Stock, Nevada Power Preference Stock, Sierra Pacific Power Preferred
Stock, Sierra Pacific Power Class A Preferred Stock or tax preference preferred
securities, other than in connection with refunding of securities with preferred
stock, debt or tax preference preferred securities at a lower cost of funds or
in connection with intercompany purchases of capital stock, other than the
redemption of the Sierra Pacific Rights or Nevada Power Rights pursuant to the
terms of the Sierra Pacific Rights Agreement and the Nevada Power Rights
Agreement, other than redemptions, purchases or acquisitions of Nevada Power
Preferred Stock or other action with respect to Nevada Power Preferred Stock to
comply with Section 8.2(h) hereof, and other than open market purchases of
Sierra Pacific Common Stock or Nevada Power Common Stock for purposes of
satisfying any currently existing plans, programs or arrangements to be funded
with such stock.

          (c) Issuance of Securities.  No party shall, nor shall any party
permit any of its subsidiaries to, issue, agree to issue, deliver, sell, award,
pledge, dispose of or otherwise encumber or authorize or propose the issuance,
delivery, sale, award, pledge, disposition or encumbrance of, any shares of
their capital stock of any class or any securities convertible into or
exchangeable for, or any rights, warrants or options to acquire, any such shares
or convertible or exchangeable securities other than intercompany issuances of
capital stock, other than employee stock options in the ordinary course of
business consistent with past practice and other than issuances, in the case of
Sierra Pacific and its subsidiaries, (i) in connection with refunding of Sierra
Pacific Power  Preferred Stock, Sierra Pacific Power Class A Preferred Stock or
tax preference preferred securities with preferred stock or tax preference
preferred securities at a lower cost of funds; (ii) of up to 300,000 shares of
Sierra Pacific Common Stock, including shares to be issued pursuant all plans,
programs or arrangements providing for the issuance of Sierra Pacific Common
Stock; (iii) of capital stock under the Sierra Pacific Rights Agreement if
required by the terms thereof; (iv) of up to, together with all amounts of long-
term debt incurred in accordance with Section 6.1(h), $200 million in the
aggregate of new issuances of preferred stock or tax preference preferred
securities and (v) open market purchases for all plans, programs or
arrangements; and in the case of Nevada Power (i) in connection with refunding
of Nevada Power Preferred Stock or Nevada Power Preference Stock with preferred
stock or tax preference preferred securities at a lower cost of funds; (ii) of
up to 500,000 shares of Nevada Power

                                      43
<PAGE>
 
Common Stock, including shares to be issued pursuant to all plans, programs or
arrangements providing for the issuance of Nevada Power Common Stock; (iii) of
capital stock under the Nevada Power Rights Agreement if required by the terms
thereof; (iv) of up to, together with all amounts of long-term debt incurred in
accordance with Section 6.1(h), $350 million in the aggregate of new issuances
of preferred stock or tax preference preferred securities; and (v) open market
purchases for all plans, programs or arrangements.

          (d) Charter Documents.  Except as set forth in Section 6.1(d) of the 
Sierra Pacific Disclosure Schedule or the Nevada Power Disclosure Schedule, no
party shall amend or propose to amend its respective articles of incorporation
or bylaws, except as contemplated herein and except to the extent that any
document setting forth the terms of a series of preferred stock issued as
contemplated in Section 6.1(c) constitutes an amendment to the articles of
incorporation.

          (e) No Acquisitions.  Except (i) as set forth in Section 6.1(e) of the
Sierra Pacific Disclosure Schedule or the Nevada Power Disclosure Schedule, (ii)
for acquisitions by Sierra Pacific and its affiliates of less than $25 million
in the aggregate that are not set forth in Section 6.1(e) of the Sierra Pacific
Disclosure Schedule, and (iii) for acquisitions by Nevada Power and its
affiliates of less than $25 million in the aggregate that are not set forth in
Section 6.1(e) of the Nevada Power Disclosure Schedule, no party shall, nor
shall any party permit any of its subsidiaries to, acquire, or publicly propose
to acquire, or agree to acquire, by merger or consolidation with, or by purchase
or otherwise, a substantial equity interest in or a substantial portion of the
assets of, any business or any corporation, partnership, association or other
business organization or division thereof or otherwise acquire or agree to
acquire a material amount of assets, other than in the ordinary course of
business consistent with past practice.

          (f) Capital Expenditures:  Additional Facilities, Etc.  Except as set
forth in Section 6.1(f) of the Sierra Pacific Disclosure Schedule or the Nevada
Power Disclosure Schedule, each of which sets forth capital expenditures
budgeted on the date hereof through December 31, 2000 (including without
limitation projects ongoing or mandated by a binding legal commitment existing
on the date hereof) and except as required by law or regulatory action, no party
shall, nor shall any party permit any of its subsidiaries to, (i) make capital
expenditures, (ii) commence construction of any additional facilities for (A)
the generation or transmission of electric energy, (B) in the case of Sierra
Pacific, the production, gathering, storage or transmission of natural gas, or
(C) in the case of Sierra Pacific, the production, gathering, storage,
treatment, filtration or transmission of water, or (iii) obligate itself to
purchase or otherwise acquire, or to share, any of such facilities, in excess of
$25 million in any individual transaction or, together with all amounts spent in
accordance with Section 6.1(e), $100 million in the aggregate.

          (g) No Dispositions.  Other than dispositions by a party and its
affiliates of less than $25 million individually or in the aggregate, no party
shall, nor shall any party permit any of its subsidiaries to, sell, lease,
license, encumber or otherwise dispose of, any of its assets, other than
dispositions in the ordinary course of their business consistent with past
practice and other than as required by law or regulatory action.

                                      44
<PAGE>
 
          (h) Indebtedness.  Except as contemplated by this Agreement to pay the
Sierra Pacific Cash Consideration and the Nevada Power Cash Consideration , no
party shall, nor shall any party permit any of its subsidiaries to, incur or
guarantee any indebtedness (including any debt borrowed or guaranteed or
otherwise assumed, including, without limitation, the issuance of debt
securities or warrants or rights to acquire debt) or enter into any "keep well"
or other agreement to maintain any financial statement condition of another
person or entity or enter into any arrangement having the economic effect of any
of the foregoing other than (i) short-term indebtedness or guarantees or "keep
well" or other agreements in the ordinary course of business consistent with
past practice (such as the issuance of commercial paper or the use of existing
credit facilities or hedging activities); (ii) long-term indebtedness or "keep
well" or other agreements not aggregating more than, together with any preferred
stock or tax preference preferred securities issued by Sierra Pacific or Nevada
Power, as the case may be, in accordance with Section 6.1(c)(iv), $200 million 
in the case of Sierra Pacific and its subsidiaries or $350 million in the case
of Nevada Power and its subsidiaries; (iii) arrangements between Sierra Pacific
and any of its wholly-owned subsidiaries or among any of Sierra Pacific's 
wholly-owned subsidiaries; (iv) as set forth in Section 6.1(h) of the Sierra
Pacific Disclosure Schedule; (v) in connection with the refunding with preferred
stock, tax preference preferred securities or debt at a lower cost of funds of
Nevada Power Preferred Stock, Nevada Power Preference Stock, Sierra Pacific
Power Preferred Stock, Sierra Pacific Power Class A Preferred Stock or tax
preference preferred securities permitted in Section 6.1(b); or (vi) as may be
necessary in connection with acquisitions permitted by Section 6.1(e) or capital
expenditures permitted by Section 6.1(f) provided that, in the case of this
clause (vi), such acquisitions are identified by project and amount on Section
6.1(e) or 6.1(f) of the Sierra Pacific Disclosure Schedule or the Nevada Power
Disclosure Schedule, as the case may be.

          (i) Compensation, Benefits.  Except as set forth in the last sentence
of this Section 6.1(i), Section 7.10, Section 7.11 and Section 7.15 hereof or
Section 6.1(i) of the Sierra Pacific Disclosure Schedule and Nevada Power
Disclosure Schedule, no party shall, nor shall any party permit any of its
subsidiaries to, in the absence of the written agreement of the other party
hereto, (i) enter into, adopt or amend (except as may be required by applicable
law), or increase the amount or accelerate the payment or vesting of any benefit
or amount payable, or grant any discretionary awards or benefits under, any
employee benefit plan or other contract, agreement, commitment, arrangement,
plan or policy maintained by, contributed to or entered into by such party or
any of its subsidiaries, or increase, or enter into any contract, agreement,
commitment or arrangement to increase in any manner, the compensation or fringe
benefits, or otherwise to extend, expand or enhance the engagement, employment
or any related rights, of any director, officer or other employee of such party
or any of its subsidiaries, except for normal increases in salary in the
ordinary course of business consistent with past practice that, in the
aggregate, do not result in a material increase in benefits or compensation
expense to such party or any of it subsidiaries, or (ii) enter into or amend any
employment contract, special pay arrangement with respect to termination of
employment or other similar contract, agreement or arrangement with any director
or officer. Notwithstanding anything herein to the contrary, except as set forth
in Section 6.1(i) of the Sierra Pacific Disclosure Schedule or Section 6.1(i) of
the Nevada Power Disclosure Schedule, (i) no party shall, nor shall any party
permit any of its subsidiaries to, establish or maintain any severance plan,
program, policy, agreement or arrangement under which any person would be
entitled to any benefits as a result of the transactions contemplated herein,

                                      45
<PAGE>
 
(ii) Sierra Pacific may enter into employment agreements substantially in the
form previously delivered to Nevada Power with the officers set forth in Section
6.1(i) of the Sierra Pacific Disclosure Schedule, and (iii) Nevada Power may
enter into employment agreements substantially in the form previously delivered
to Sierra Pacific with the officers set forth in Section 6.1(i) of the Nevada
Power Disclosure Schedule.

          (j) 1935 Act.  No party shall, nor shall any party permit any of its
subsidiaries to, except as required or contemplated by this Agreement, engage in
any activities which would cause a change in its status, or that of its
subsidiaries, under the 1935 Act, or that would require the approval of the SEC
under Section 9(a)(2) of the 1935 Act for any of the transactions contemplated
by this Agreement.

          (k) Accounting.  No party shall, nor shall any party permit any of its
subsidiaries to, make any changes in their accounting methods, except as
required by law, rule, regulation or GAAP.  Any party making any such change
will give written notice to the other party of such change.

          (l) Tax-Free Status.  No party shall, nor shall any party permit any
of its subsidiaries to, take any actions which would, or would be reasonably
likely to, adversely affect the status of the Mergers as tax-free transactions,
both to the parties and their respective stockholders (except to the extent of
any cash received), and each party hereto shall use all reasonable efforts to
achieve such result.

          (m) Affiliate Transactions.  Except as set forth in Section 6.1(m) of 
the Sierra Pacific Disclosure Schedule or the Nevada Power Disclosure Schedule,
no party shall, nor shall any party permit any of its subsidiaries to, enter
into any material agreement or arrangement with any other person which, directly
or indirectly, controls or is under common control with or is controlled by such
party, or any of its respective subsidiaries on terms to such party or its
subsidiaries materially less favorable than could be reasonably expected to have
been obtained with an unaffiliated third party on an arm's-length basis.

          (n) Cooperation, Notification.  Each party shall, and shall cause its
subsidiaries to, (i) confer on a regular and frequent basis with one or more
representatives of the other party to discuss, subject to applicable law,
material operational matters and the general status of its ongoing operations;
(ii) promptly notify the other party of any significant changes in its business,
properties, assets, financial condition or results of operations; (iii) promptly
advise the other party of any change or event which has had or, to the knowledge
of such party, is reasonably likely to result in, a Sierra Pacific Material
Adverse Effect or a Nevada Power Material Adverse Effect, as the case may be;
and (iv) promptly provide the other party with copies of all filings made by
such party or any of its subsidiaries with any state or federal court,
administrative agency, commission or other Governmental Authority in connection
with this Agreement and the transactions contemplated hereby.

          (o) Rate Matters.  Each party shall, and shall cause its subsidiaries
to, discuss with the other party any changes in its or its subsidiaries' rates
or charges, standards of service, other regulatory matters or accounting from
those in effect on the date of this Agreement and 

                                      46
<PAGE>
 
consult with the other party prior to making any filing (or any amendment
thereto), or effecting any agreement, commitment, arrangement or consent,
whether written or oral, formal or informal, with respect thereto, and no party
will make any filing to change its or its subsidiaries' rates on file with any
Governmental Authority that would have a Sierra Pacific Material Adverse Effect
or Nevada Power Material Adverse Effect.

          (p) Third-Party Consents.  Each party shall, and shall cause its
respective subsidiaries to, use all commercially reasonable efforts to obtain
all Sierra Pacific Required Consents or Nevada Power Required Consents, as the
case may be.  Each party shall promptly notify the other party of any failure or
prospective failure to obtain any such consents and, if requested by the other
party, shall provide to the other party copies of all Sierra Pacific Required
Consents or Nevada Power Required Consents, as the case may be, obtained by such
party.

          (q) No Breach, Etc.  No party shall, nor shall any party permit any of
its subsidiaries to, willfully take any action that would, or is reasonably
likely to, result in a material breach of any provision of this Agreement or in
any of its representations and warranties set forth in this Agreement being
untrue on and as of the Closing Date.

          (r) Tax-Exempt Status.  No party shall, nor shall any party permit any
subsidiary to, take any action that would likely jeopardize the exclusion from
gross income, for purposes of federal income taxation, of the interest on the
outstanding revenue bonds issued for the benefit of Sierra Pacific or Nevada
Power, or any subsidiary of either, which qualify on the date hereof under Code
(S) 142(a) as "exempt facility bonds" or as tax-exempt industrial development
bonds under Section 103(b)(4) of the Internal Revenue Code of 1954, as amended
prior to the Tax Reform Act of 1986.
 
          (s) Contracts.  No party shall, nor shall any party permit any of its
respective subsidiaries to modify, amend, terminate, renew or fail to use
reasonable business efforts to renew any material contract or agreement to which
such party or any subsidiary of such party is a party or waive, release or
assign any material rights or claims under such contracts except (i) in the
ordinary course of business consistent with past practice or (ii) other than in
the ordinary course of business consistent with past practice, to the extent
such action or failure to act does not have an adverse effect in excess of $10
million calculated on a net present value basis.

          (t) Discharge of Liabilities.  No party shall, nor shall any party
permit any of its respective subsidiaries to, pay, discharge or satisfy any
material claims, liabilities or obligations (absolute, accrued, asserted or
unasserted, contingent or otherwise), other than any payment, discharge or
satisfaction, in the ordinary course of business consistent with past practice
(which includes the payment of final and unappealable judgments), not in excess
of $10 million calculated on a net present value basis or in accordance with
their terms, of (i) indebtedness or (ii) liabilities reflected or reserved
against in, or contemplated by, the most recent consolidated financial
statements (or the notes thereto) of such party included in such party's reports
filed with the SEC, or incurred in the ordinary course of business consistent
with past practice.


                                   ARTICLE 7

                                      47
<PAGE>
 
                             ADDITIONAL AGREEMENTS

          Section 7.1  Access to Information.  Upon reasonable notice and
during normal business hours, each party shall, and shall cause its subsidiaries
to, afford to the officers, directors, employees, accountants, counsel,
investment banker, financial advisor and other representatives of the other
(collectively, "Representatives") reasonable access, during normal business
hours throughout the period prior to the Effective Time, to all of its
properties, books, contracts, commitments and records (including, but not
limited to, Tax Returns) and, during such period, each party shall, and shall
cause its subsidiaries to, furnish promptly to the other (i) a copy of each
reasonably available report, schedule and other document filed or received by it
or any of its subsidiaries pursuant to the requirements of federal or state
securities laws or filed with the SEC, the FERC, the Department of Justice, the
Federal Trade Commission, the Nevada Commission, the California Commission or
any other federal or state regulatory agency or commission, and (ii) all
information concerning themselves, their subsidiaries, their respective
businesses and properties, directors, officers and stockholders and such other
matters as may be reasonably requested by the other party in connection with any
filings, applications or approvals required or contemplated by this Agreement,
in each case except as such access may be prohibited by law.  All documents and
information furnished pursuant to this Section 7.1 shall be subject to the
Confidentiality Agreement, dated as of March 10, 1998, between Sierra Pacific
and Nevada Power (the "Confidentiality Agreement").

          Section 7.2  Joint Proxy Statement and Registration Statement.

          (a) Preparation and Filing.  The parties will prepare and file with
the SEC as soon as reasonably practicable after the date hereof the Registration
Statement and the Proxy Statement (together, the "Joint Proxy/Registration
Statement").  The parties hereto shall each use reasonable efforts to cause the
Joint Proxy/Registration Statement to be declared effective under the Securities
Act as promptly as practicable after such filing.  Each party hereto shall also
take such action as may be reasonably required to cause the shares of Sierra
Pacific Common Stock issuable in connection with the Mergers to be registered or
to obtain an exemption from registration under applicable state "blue sky" or
securities laws; provided, however, that no party shall be required to register
or qualify as a foreign corporation or to take other action which would subject
it to service of process in any jurisdiction where it will not be, following the
Mergers, so subject.  Each of the parties hereto shall furnish all information
concerning itself which is required or customary for inclusion in the Joint
Proxy/Registration Statement.  The parties shall use reasonable efforts to cause
the shares of Sierra Pacific Common Stock issuable in the Mergers to be approved
for listing on the NYSE upon official notice of issuance.  The information
provided by any party hereto for use in the Joint Proxy/Registration Statement
shall be true and correct in all material respects without omission of any
material fact which is required to make such information not false or
misleading. No representation, covenant or agreement is made by or on behalf of
any party hereto with respect to information supplied by any other party for
inclusion in the Joint Proxy Statement/Registration Statement.

          (b) Amendments and Supplements.  No amendment or supplement to the
Proxy Statement or the Registration Statement shall be made without the approval
of all parties. Each party shall advise the others, promptly after it receives
notice thereof, of the time the 

                                      48
<PAGE>
 
Registration Statement has become effective or any supplement or amendment
thereto has been filed, the issuance of any stop order, the suspension, if
applicable, of the qualification of such party's common stock for sale in any
jurisdiction, or any request by the SEC for amendment of the Proxy Statement or
the Registration Statement or comments thereon and responses thereto or requests
by the SEC for additional information.

          (c) Letter of Sierra Pacific's Accountants.  Sierra Pacific shall use
best efforts to cause to be delivered to Nevada Power a letter of Deloitte &
Touche LLP dated a date within two business days before the date of the Joint
Proxy/Registration Statement, and addressed to Nevada Power, in form and
substance reasonably satisfactory to Nevada Power and customary in scope and
substance for "cold  comfort" letters delivered by independent public
accountants in connection with registration statements on Form S-4.

          (d) Letter of Nevada Power's Accountants.  Nevada Power shall use best
efforts to cause to be delivered to Sierra Pacific a letter of Deloitte & Touche
LLP, dated a date within two business days before the date of the Joint
Proxy/Registration Statement, and addressed to Sierra Pacific, in form and
substance reasonably satisfactory to Sierra Pacific and customary in scope and
substance for "cold comfort" letters delivered by independent public accountants
in connection with registration statements on Form S-4.

          (e) Fairness Opinions.  It shall be a condition to the mailing of the
Joint Proxy/Registration Statement to the stockholders of Sierra Pacific and
Nevada Power that (i) neither SG Barr Devlin nor Merrill Lynch has withdrawn its
opinion referred to in Section 4.15 and (ii) PaineWebber Incorporated has not
withdrawn its opinion referred to in Section 5.15.

          Section 7.3  Regulatory Matters.

          (a) HSR Filings.  Each party hereto shall file or cause to be filed
with the Federal Trade Commission and the Department of Justice any
notifications required to be filed under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended (the "HSR Act"), and the rules and
regulations promulgated thereunder with respect to the transactions contemplated
hereby.  Such parties will use all commercially reasonable efforts to make such
filings promptly and to respond promptly to any requests for additional
information made by either of such agencies.

          (b) Other Regulatory Approvals.  Each party hereto shall cooperate and
use its best efforts to promptly prepare and file all necessary documentation,
to effect all necessary applications, notices, petitions, filings and other
documents, and to use all commercially reasonable efforts to obtain all
necessary permits, consents, approvals and authorizations of all Governmental
Authorities necessary or advisable to consummate the transactions contemplated
by this Agreement, including, without limitation, the Sierra Pacific Required
Statutory Approvals and the Nevada Power Required Statutory Approvals, such
commercially reasonable efforts to include, in the case of Sierra Pacific,
obtaining the necessary permits, consents, approvals and authorizations of the
Federal Energy Regulatory Commission, of any state regulatory agencies and under
the 1935 Act. Sierra Pacific shall have the right to review and approve in
advance all characterizations of the information relating to Sierra Pacific, on
the one hand, and Nevada Power 

                                      49
<PAGE>
 
shall have the right to review and approve in advance all characterizations of
the information relating to Nevada Power, on the other hand, in either case,
which appear in any filing made in connection with the transactions contemplated
by this Agreement or the Mergers. Sierra Pacific and Nevada Power agree that
they will consult with each other with respect to the obtaining of all such
necessary permits, consents, approvals and authorizations of Governmental
Authorities.

          Section 7.4  Shareholder Approval.

          (a) Approval of Nevada Power Stockholders.  Subject to the provisions
of Section 7.4(c) and Section 7.4(d), Nevada Power shall, as soon as reasonably
practicable after the date hereof (i) take all steps necessary to duly call,
give notice of, convene and hold a special meeting of its stockholders (the
"Nevada Power Special Meeting") for the purpose of securing the Nevada Power
Stockholders' Approval, (ii) distribute to its stockholders the Proxy Statement
in accordance with applicable federal and state law and with its articles of
incorporation and bylaws, (iii) subject to the fiduciary duties of its Board of
Directors, recommend to its stockholders the approval of this Agreement and the
transactions contemplated hereby and (iv) cooperate and consult with Sierra
Pacific with respect to each of the foregoing matters.

          (b) Approval of Sierra Pacific Stockholders.  Subject to the
provisions of Section 7.4(c) and Section 7.4(d), Sierra Pacific shall, as soon
as reasonably practicable after the date hereof (i) take all steps necessary to
duly call, give notice of, convene and hold a meeting of its stockholders (the
"Sierra Pacific Special Meeting") for the purpose of securing the Sierra Pacific
Stockholders' Approval, (ii) distribute to its stockholders the Proxy Statement
in accordance with applicable federal and state law and with its articles of
incorporation and by-laws, (iii) subject to the fiduciary duties of its Board of
Directors, recommend to its stockholders the approval of this Agreement and the
transactions contemplated hereby and (iv) cooperate and consult with Nevada
Power with respect to each of the foregoing matters.

          (c) Meeting Date.  The Nevada Power Special Meeting for the purpose of
securing the Nevada Power Stockholders' Approval and the Sierra Pacific Special
Meeting for the purpose of securing the Sierra Pacific Stockholders' Approval
shall be held on such dates as Sierra Pacific and Nevada Power shall mutually
determine.

          (d) Fairness Opinions Not Withdrawn.  It shall be a condition to the
obligation of Sierra Pacific to hold the Sierra Pacific Special Meeting that the
opinion of each of SG Barr Devlin and Merrill Lynch, referred to in Section 
4.15, shall not have been withdrawn, and it shall be a condition to the
obligation of Nevada Power to hold the Nevada Power Special Meeting that the
opinion of PaineWebber Incorporated, referred to in Section 5.15, shall not have
been withdrawn.

          Section 7.5  Directors' and Officers' Indemnification.

          (a) Indemnification.  From and after the Effective Time, Sierra
Pacific and the Surviving Corporation shall, to the fullest extent permitted by
applicable law, indemnify, defend and hold harmless each person who is now, or
has been at any time prior to the date hereof, or who becomes prior to the
Effective Time, an officer, director or employee of Sierra Pacific or 

                                      50
<PAGE>
 
Nevada Power, respectively, or any of their subsidiaries (each an "Indemnified
Party" and collectively, the "Indemnified Parties") against (i) all losses,
expenses (including reasonable attorney's fees and expenses), claims, damages or
liabilities or, subject to the proviso of the next succeeding sentence, amounts
paid in settlement, arising out of actions or omissions occurring at or prior to
the Effective Time (and whether asserted or claimed prior to, at or after the
Effective Time) that are, in whole or in part, based on or arising out of the
fact that such person is or was a director, officer or employee of Sierra
Pacific or Nevada Power or any of their subsidiaries (the "Indemnified
Liabilities"), and (ii) all Indemnified Liabilities to the extent they are based
on or arise out of or pertain to the transactions contemplated by this
Agreement. In the event of any such loss, expense, claim, damage or liability
(whether or not arising before the Effective Time), (i) Sierra Pacific or the
Surviving Corporation, as the case may be, shall pay the reasonable fees and
expenses of counsel selected by the Indemnified Parties, which counsel shall be
reasonably satisfactory to Sierra Pacific or the Surviving Corporation, as the
case may be, promptly after statements therefor are received and otherwise
advance to such Indemnified Party upon request reimbursement of documented
expenses reasonably incurred, (ii) Sierra Pacific or the Surviving Corporation,
as the case may be, will cooperate in the defense of any such matter and (iii)
any determination required to be made with respect to whether an Indemnified
Party's conduct complies with the standards set forth under Nevada law and the
articles of incorporation or bylaws shall be made by independent counsel
mutually acceptable to Sierra Pacific or the Surviving Corporation, as the case
may be, and the Indemnified Party; provided, however, that neither Sierra
Pacific nor the Surviving Corporation, as the case may be, shall be liable for
any settlement effected without its written consent (which consent shall not be
unreasonably withheld). The Indemnified Parties as a group may retain only one
law firm with respect to each related matter except to the extent there is, in
the opinion of counsel to an Indemnified Party, under applicable standards of
professional conduct, a conflict on any significant issue between positions of
such Indemnified Party and any other Indemnified Party or Indemnified Parties.

          (b) Insurance.  For a period of six years after the Effective Time,
Sierra Pacific and the Surviving Corporation shall cause to be maintained in
effect policies of directors' and officers' liability insurance maintained by
Sierra Pacific or Nevada Power, as the case may be, for the benefit of those
persons who are currently covered by such policies on terms no less favorable
than the terms of such current insurance coverage; provided, however, that
neither Sierra Pacific nor the Surviving Corporation, as the case may be, shall
be required to expend in any year an amount in excess of 200% of the annual
aggregate premiums currently paid by Sierra Pacific or Nevada Power, as the case
may be, for such insurance; and provided, further, that if the annual premiums
of such insurance coverage exceed such amount, Sierra Pacific or the Surviving
Corporation, as the case may be, shall be obligated to obtain a policy with the
best coverage available, in the reasonable judgment of the respective Board of
Directors, for a cost not exceeding such amount.

          (c) Successors.  In the event Sierra Pacific or the Surviving
Corporation or any of their successors or assigns (i) consolidates with or
merges into any other person and shall not be the continuing or surviving
corporation or entity of such consolidation or merger or (ii) transfers all or
substantially all of its properties and assets to any person, then and in either
such case, proper provisions shall be made so that the successors and assigns of
Sierra Pacific or 

                                      51
<PAGE>
 
the Surviving Corporation, as the case may be, shall assume the obligations set
forth in this Section 7.5.

          (d) Survival of Indemnification.  To the fullest extent permitted by
law, from and after the Effective Time, all rights to indemnification as of the
date hereof in favor of the employees, agents, directors and officers of Sierra
Pacific or Nevada Power and their subsidiaries with respect to their activities
as such prior to the Effective Time, as provided in the articles of
incorporation and bylaws in effect on the date hereof, or otherwise  in effect
on the date hereof, shall survive the Mergers and shall continue in full force
and effect for a period of not less than six years from the Effective Time.

          (e) Benefit.  The provisions of this Section 7.5 are intended to be 
for the benefit of, and shall be enforceable by, each Indemnified Party, his or
her heirs and his or her representatives.

          Section 7.6  Disclosure Schedules.  On the date hereof, (i) Nevada
Power has delivered to Sierra Pacific a schedule (the "Nevada Power Disclosure
Schedule"), accompanied by a certificate signed by the chief financial officer
of Nevada Power stating the Nevada Power Disclosure Schedule is being delivered
pursuant to this Section 7.6(i) and (ii) Sierra Pacific has delivered to Nevada
Power a schedule (the "Sierra Pacific Disclosure Schedule"), accompanied by a
certificate signed by the chief financial officer of Sierra Pacific stating the
Sierra Pacific Disclosure Schedule is being delivered pursuant to this Section
7.6(ii).  The Sierra Pacific Disclosure Schedule and the Nevada Power Disclosure
Schedule are collectively referred to herein as the "Disclosure Schedules."  The
Disclosure Schedules constitute an integral part of this Agreement and modify
the respective representations, warranties, covenants or agreements of the
parties hereto contained herein to the extent that such representations,
warranties, covenants or agreements expressly refer to the Disclosure Schedules.
Anything to the contrary contained herein or in the Disclosure Schedules
notwithstanding, any and all statements, representations, warranties or
disclosures set forth in the Disclosure Schedules shall be deemed to have been
made on and as of the date hereof.

          Section 7.7  Public Announcements.  Subject to each party's disclosure
obligations imposed by law, Sierra Pacific and Nevada Power will cooperate with
each other in the development and distribution of all news releases and other
public information disclosures with respect to this Agreement or any of the
transactions contemplated hereby and shall not issue any public announcement or
statement with respect hereto without the consent of the other party (which
consent shall not be unreasonably withheld).

          Section 7.8  Rule 145 Affiliates.  Within 30 days after the date of
this Agreement, Sierra Pacific shall identify in a letter to Nevada Power, and
Nevada Power shall identify in a letter to Sierra Pacific, all persons who are,
and to such person's best knowledge who will be at the Closing Date,
"affiliates" of Sierra Pacific and Nevada Power, respectively, as such term is
used in Rule 145 under the Securities Act.  Each of Sierra Pacific and Nevada
Power shall use all reasonable best efforts to cause their respective affiliates
(including any person who may be deemed to have become an affiliate after the
date of the letter referred to in the prior sentence) to 

                                      52
<PAGE>
 
deliver to Sierra Pacific on or prior to the Closing Date a written agreement
substantially in the form attached as Exhibit (each, an "Affiliate Agreement").

          Section 7.9  Employee Agreements and Workforce Matters.

          (a) Certain Employee Agreements.  The Surviving Corporation and its
subsidiaries shall honor, without modification, all collective bargaining
agreements and, subject to Section 7.10 and Section 7.15, all contracts,
agreements and commitments of Nevada Power which apply to any current or former
employee or current or former director of Nevada Power; provided, however, that
this undertaking is not intended to prevent the Surviving Corporation from
enforcing such contracts, agreements, collective bargaining agreements and
commitments in accordance with their terms, including, without limitation, any
reserved right to amend, modify, suspend, revoke or terminate any such contract,
agreement, collective bargaining agreement or commitment.

          (b) Workforce Matters.  Subject to compliance with applicable law and
obligations under applicable collective bargaining agreements, for a period of
three years following the Effective Time, any reductions in workforce in respect
of employees of Sierra Pacific and its subsidiaries, including the Surviving
Corporation and its subsidiaries, shall be made on a fair and equitable basis,
in light of the circumstances and the objectives to be achieved, giving
consideration to previous work history, job experience, qualifications, and
business needs without regard to whether employment prior to the Effective Time
was with Sierra Pacific or its subsidiaries or Nevada Power or its subsidiaries,
and any employees whose employment is terminated or jobs are eliminated by
Sierra Pacific or any of its subsidiaries, including the Surviving Corporation
or its subsidiaries, during such period shall be entitled to participate on a
fair and equitable basis in the job opportunity and employment placement
programs offered by Sierra Pacific or any of its subsidiaries.  Any workforce
reductions carried out following the Effective Time by Sierra Pacific and its
subsidiaries, including the Surviving Corporation and its subsidiaries, shall be
done in accordance with all applicable collective bargaining agreements, and all
laws and regulations governing the employment relationship and termination
thereof including, without limitation, the Worker Adjustment and Retraining
Notification Act and regulations promulgated thereunder, and any comparable
state or local law.

          Section 7.10  Employee Benefit Plans.  Except as may be required by
applicable law and obligations under applicable collective bargaining agreements
or as the parties may otherwise agree, each of the Nevada Power Benefit Plans
and the Sierra Pacific Benefit Plans in effect on the date hereof (or as amended
or established in accordance with or as permitted by this Agreement) shall be
maintained in effect, except with respect to Nevada Power's 1993 Long-Term
Incentive Plan, as provided in Section 7.11 and as provided in the employment
contracts referred to in Section 7.15, with respect to the employees, former
employees, directors or former directors of Nevada Power and any of its
subsidiaries and of Sierra Pacific and any of its subsidiaries, respectively,
who are covered by such plans or agreements immediately prior to the Effective
Time until Sierra Pacific determines otherwise on or after the Effective Time
and the Surviving Corporation shall assume as of the Effective Time each Nevada
Power Benefit Plan maintained by Nevada Power immediately prior to the Effective
Time and perform such plan or agreement in the same manner and to the same
extent that Nevada Power would be required to 

                                      53
<PAGE>
 
perform thereunder; provided, however, that nothing herein contained, other than
the provisions of Section 6.1(i), shall limit any reserved right contained in
any such Nevada Power Benefit Plan or Sierra Pacific Benefit Plan to amend,
modify, suspend, revoke or terminate any such plan or agreement. Without
limiting the foregoing, each participant in any Nevada Power Benefit Plan or
Sierra Pacific Benefit Plan shall receive credit for purposes of eligibility to
participate, vesting and eligibility to receive benefits (but specifically
excluding for benefit accrual purposes) under any benefit plan of Sierra Pacific
or any of its subsidiaries or affiliates for service credited for the
corresponding purpose under any such benefit plan; provided, however, that such
crediting of service shall not operate to cause any such plan or agreement to
fail to comply with the applicable provisions of the Code and ERISA. Sierra
Pacific and Nevada Power will cooperate on and after the date hereof to develop
appropriate employee benefit plans, programs and arrangements, including but not
limited to, executive and incentive compensation, stock option and supplemental
executive retirement plans, for employees and directors of Sierra Pacific and
its subsidiaries from and after the Effective Time including, without
limitation, a successor to Nevada Power's 1993 Long-Term Incentive Plan.
However, no provision contained in this Section 7.10 shall be deemed to
constitute an employment contract between Sierra Pacific or any of its
subsidiaries and any individual, or a waiver of Sierra Pacific's or its
subsidiary's right to discharge any employee at any time, with or without cause.

          Section 7.11  Incentive, Stock and Other Plans.

          (a) Sierra Pacific Action.  With respect to each of the Nevada Power
1993 Long-Term Incentive Plan and 401(k) Savings Plan under which the delivery
of Nevada Power Common Stock is required upon payment of benefits or grant of
awards (the "Stock Plans"), (i) Sierra Pacific and Nevada Power shall take such
action as may be necessary so that, after the Effective Time of the Second
Merger, the Stock Plans provide only for the issuance or purchase in the open
market only of Sierra Pacific Common Stock rather than Nevada Power Common
Stock, and (ii) Sierra Pacific shall take all corporate action necessary or
appropriate to (x) obtain shareholder approval with respect to such plan to the
extent such approval is required for purposes of the Code or other applicable
law, or to the extent Sierra Pacific deems it desirable, (y) reserve for
issuance under such plan or otherwise provide a sufficient number of shares of
Sierra Pacific Common Stock for delivery upon payment of benefits or grants of
awards under such plan and (z) as soon as practicable after the Effective Time
of the Second Merger, file registration statements on Form S-3 or Form S-8, as
the case may be (or any successor or other appropriate forms), with respect to
the shares of the Sierra Pacific Common Stock subject to such plan to the extent
such registration statement is required under applicable law, and Sierra Pacific
shall use its best efforts to maintain the effectiveness of such registration
statements (and maintain the current status of the prospectuses contained
therein or related thereto) for so long as such benefits and grants remain
payable.

          (b) Dividend Reinvestment Plans.  The dividend reinvestment plan of
Nevada Power shall terminate as of the Effective Time of the Second Merger and
Nevada Power shall send notices of termination to participants therein prior to
the Effective Time of the Second Merger.  The Board of Directors of Sierra
Pacific shall approve an amendment to the Sierra Pacific dividend reinvestment
plan to provide for the automatic participation therein effective immediately
after the Effective Time of the Second Merger by participants who participate in
the 

                                      54
<PAGE>
 
Nevada Power dividend reinvestment plan immediately prior to Effective Time of
the Second Merger.

          Section 7.12  No Solicitations.  From and after the date hereof, each
party hereto shall not, and shall cause its subsidiaries not to, and shall not
authorize or permit any of its Representatives to, directly or indirectly,
initiate, solicit or encourage (including by way of furnishing information) or
take any other action to facilitate knowingly any inquiries or the making of any
offer or proposal which constitutes or is reasonably likely to lead to, any
Business Combination (as defined below), or, in the event of an unsolicited
Business Combination proposal, engage in negotiations or provide any information
or data to any person relating to any Business Combination; provided, however,
that notwithstanding any other provision hereof Sierra Pacific or Nevada Power
may, at any time prior to the time at which the Sierra Pacific Stockholders'
Approval, in the case of Sierra Pacific, or the Nevada Power Stockholders'
Approval, in the case of Nevada Power, has been obtained, (i) engage in
discussions or negotiations with a third party who (without any solicitation,
initiation, encouragement, discussion or negotiation, directly or indirectly, by
or with the party or its Representatives after the date hereof) seeks to
initiate such discussions or negotiations, furnish such third party information
concerning itself and its business, properties and assets and accept a Business
Combination proposal from such third party if, and only to the extent that,
(A)(x) such third party shall first have made an unsolicited Business
Combination proposal to Sierra Pacific or Nevada Power, as the case may be, that
the Sierra Pacific Board of Directors or the Nevada Power Board of Directors, as
the case may be, reasonably believes in good faith, after consultation with its
financial advisors, may be more favorable to the stockholders of such party than
the Mergers and (y) the Board of Directors of Sierra Pacific or Nevada Power, as
the case may be, shall have determined in good faith, after consultation with
its financial advisors and outside counsel, that failing to take such action
could reasonably be expected to be a breach of its fiduciary duties under
applicable law and (B) prior to furnishing such information to, entering into
negotiations with or accepting the Business Combination proposal from, such
third party, Sierra Pacific or Nevada Power, as the case may be, (x) provides
prompt notice to Sierra Pacific or Nevada Power, as the case may be, to the
effect that it is furnishing information to or entering into discussions or
negotiations with such third party and (y) receives from such third party an
executed confidentiality agreement in reasonably customary form on terms not
materially more favorable to such third party than the terms contained in the
Confidentiality Agreement, and, prior to accepting the Business Combination
proposal from such third party, terminates this Agreement pursuant to Section
9.1(e) or by Section 9.1(f), as applicable and (ii) comply with Rules 14d-9 and
14e-2 promulgated under the Exchange Act. Each party hereto shall notify the
other party orally and in writing of any such inquiries, offers or proposals
(including, without limitation, the terms and conditions of any such proposal
and the identity of the person making it), within 24 hours of the receipt
thereof, shall keep the other party informed of the status and details of any
such inquiry, offer or proposal, and shall give the other party five day's
advance notice of any agreement to be entered into with or any information to be
supplied to any person making such inquiry, offer or proposal. Each party hereto
shall immediately cease and cause to be terminated all existing discussions and
negotiations, if any, with any parties conducted heretofore with respect to any
Business Combination. As used in this Section 7.12, "Business Combination" shall
mean any tender or exchange offer, proposal for a merger, consolidation or other
business combination involving any party to this Agreement or any of its
subsidiaries, or any proposal or 

                                      55
<PAGE>
 
offer (in each case, whether or not in writing and whether or not delivered to
the stockholders of a party generally) to acquire in any manner, directly or
indirectly, a substantial equity interest in or a substantial portion of the
assets of any party to this Agreement or any of its subsidiaries, other than
pursuant to the transactions contemplated by this Agreement or any spinoff or
similar transaction.

          Section 7.13 Sierra Pacific Board of Directors. Nevada Power's and
Sierra Pacific's Boards of Directors will take such action as may be necessary
to cause the number of directors comprising the full Board of Directors of
Sierra Pacific at the Effective Time to consist of 14 members, with one-half to
be selected by Nevada Power and one-half to be selected by Sierra Pacific. The
initial designation of such directors among the three classes of the Board of
Directors of Sierra Pacific shall be agreed among the parties, the designees of
each party to be divided as equally as is feasible among such classes; provided,
however, that if, prior to the Effective Time, any of such designee shall
decline or be unable to serve, the party which designated such person shall
designate another person to serve in such person's stead. At the Effective Time,
the Board of Directors of Sierra Pacific shall have such number of standing
committees, with such names and functions as shall be agreed upon by Nevada
Power and Sierra Pacific prior to the Effective Time. Nevada Power and Sierra
Pacific shall each select one-half of the members of each committee and the
chairperson of one-half of the committees.

          Section 7.14  Officers.  After the Effective Time, the President and
Chief Operating Officer of Nevada Power will be the Chairman and Chief Executive
Officer of Sierra Pacific and the Chairman of each of Sierra Pacific's
subsidiaries, and the Chairman, Chief Executive Officer and President of Sierra
Pacific will be the President and Chief Operating Officer of Sierra Pacific and
the President and Chief Executive Officer of Sierra Pacific Power and the
Surviving Corporation.  The provisions of this Section 7.14 are subject to the
specific terms of the employment contracts referred to in Section 7.15 and the
duties and responsibilities attributable to the positions referred to in this
Section 7.14 shall be as set forth in such contracts.

          Section 7.15  Employment Contracts.  Sierra Pacific shall, as soon as
practicable after the date hereof but in any event prior to the Effective Time,
enter into employment contracts in the forms set forth in Exhibit 7.15.1 and 
Exhibit 7.15.2, respectively.

          Section 7.16  Corporate Offices.  At the Effective Time, (a) the
corporate headquarters of Sierra Pacific and the principal executive offices of
the gas and water business units will be located in R and (b) the headquarters
of Sierra Pacific Power and the Surviving Corporation and principal executive
offices of the electric business unit will be located in L.

          Section 7.17  Transition Management.  As promptly as practicable after
the date hereof, the parties shall create a transition management plan under the
direction of the President and Chief Operating Officer of Nevada Power or an
individual designated by him and the Chairman, Chief Executive Officer and
President of Sierra Pacific or an individual designated by him.  The plan shall
examine the manner in which to best organize and manage the business of Sierra
Pacific, Sierra Pacific Power and the Surviving Corporation after the Effective
Time. From time to time, the plan shall be presented to the Board of Directors
of each of Sierra Pacific and 

                                      56
<PAGE>
 
Nevada Power. After the date hereof and prior to the Effective Time, the
President and Chief Operating Officer of Nevada Power shall frequently attend
meetings of Sierra Pacific's Board of Directors and the Chairman, Chief
Executive Officer and President of Sierra Pacific shall frequently attend
meetings of Nevada Power's Board of Directors as they deem appropriate in
consultation with each other. In connection with their responsibilities with
respect to the plan, such individuals shall together recommend to the Board of
Directors of Sierra Pacific and the Surviving Corporation candidates to serve as
the officers of Sierra Pacific, Sierra Pacific Power and the Surviving
Corporation, as the case may be, who are not otherwise designated by this
Agreement. Such officers shall be appointed by the Board of Directors of Sierra
Pacific, Sierra Pacific Power or the Surviving Corporation, as the case may be,
in accordance with its Bylaws.

          Section 7.18  Expenses.  Subject to Section 9.3, all costs and 
expenses incurred in connection with this Agreement and the transactions
contemplated hereby shall be paid by the party incurring such expenses, except
that those expenses (i) incurred in connection with printing the Joint Proxy
Statement/Registration Statement, as well as the filing fee relating thereto,
(ii) seeking approvals under the HSR Act, from the Federal Energy Regulatory
Commission and from state utility regulatory agencies and (iii) relating to
public relations, Nevada corporate counsel, accounting and other consultants
mutually retained by the parties in connection with the transactions
contemplated hereby, shall be shared equally by Nevada Power, on the one hand,
and Sierra Pacific, on the other.

          Section 7.19  Covenant to Satisfy Conditions.  Subject to the terms
and conditions herein provided, each of the parties hereto agrees to use its
best efforts, taking into account the circumstances and giving due weight to the
materiality of the matter involved or the action required, to take, or cause to
be taken, all action, and to do, or cause to be done, all things necessary,
proper or advisable under applicable laws and regulations to consummate and make
effective the Mergers and the transactions contemplated by this Agreement.


                                   ARTICLE 8

                                   CONDITIONS

          Section 8.1  Conditions to Each Party's Obligations to Effect the
Mergers.  The respective obligations of each party to effect the Mergers shall
be subject to the satisfaction on or prior to the Closing Date of the following
conditions, except, to the extent permitted by applicable law, that such
conditions may be waived in writing pursuant to Section 9.5:

          (a) Shareholder Approvals.  The Sierra Pacific Stockholders' Approvals
and the Nevada Power Stockholders' Approval shall have been obtained.

          (b) No Injunction.  No temporary restraining order or preliminary or
permanent injunction or other order by any federal or state court preventing
consummation of either of the Mergers shall have been issued and continuing in
effect, and neither of the Mergers nor any of the other transactions
contemplated hereby shall have been prohibited under any applicable federal or
state law or regulation.

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<PAGE>
 
          (c) Registration Statement.  The Registration Statement shall have
become effective in accordance with the provisions of the Securities Act, and no
stop order suspending such effectiveness shall have been issued and remain in
effect.

          (d) Listing of Shares.  The shares of Sierra Pacific Common Stock
issuable in the Mergers pursuant to Article 2 shall have been approved for
listing on the NYSE upon official notice of issuance.

          (e) Statutory Approvals.  The Nevada Power Required Statutory
Approvals and the Sierra Pacific Required Statutory Approvals shall have been
obtained at or prior to the Effective Time; such approvals shall have become
Final Orders (as hereinafter defined); and no Final Order shall impose terms or
conditions that would have, or would be reasonably likely to have, a Sierra
Pacific Material Adverse Effect or a Nevada Power Material Adverse Effect.  A
"Final Order" means action by the relevant regulatory authority which has not
been reversed, stayed, enjoined, set aside, annulled or suspended, with respect
to which any waiting period prescribed by law before the transactions
contemplated hereby may be consummated has expired, and as to which all
conditions to the consummation of such transactions prescribed by law,
regulation or order have been satisfied, and as to which all opportunities for
rehearing are exhausted (whether or not any appeal thereof is pending).

          Section 8.2  Conditions to Obligations of Sierra Pacific, Lake
Merger Sub and Desert Merger Sub to Effect the Mergers.  The obligation of
Sierra Pacific, Lake Merger Sub and Desert Merger Sub to effect the Mergers is
further subject to the satisfaction, on or prior to the Closing Date, of the
following conditions, except as may be waived by Sierra Pacific in writing
pursuant to Section 9.5:

          (a) Performance of Obligations of Nevada Power.  Nevada Power will
have performed in all material respects its agreements and covenants contained
in or contemplated by this Agreement required to be performed by it at or prior
to the Effective Time.

          (b) Representations and Warranties.  The representations and
warranties of Nevada Power set forth in this Agreement shall be true and correct
in all material respects as of the date hereof (except to the extent such
representations and warranties speak as of any other date) and as of the Closing
Date as if made on and as of the Closing Date, except as otherwise contemplated
by this Agreement.

          (c) Closing Certificates.  Sierra Pacific shall have received a
certificate signed by the chief executive officer and chief financial officer of
Nevada Power, dated the Closing Date, to the effect that, to the best of each
officer's knowledge, the conditions set forth in Section 8.2(a) and Section 
8.2(b) have been satisfied.

          (d) Nevada Power Material Adverse Effect.  No material adverse effect
on the business. operations, assets, prospects, financial condition or the
results of operations of Nevada Power and its subsidiaries taken as a whole or
on the consummation of this Agreement shall have occurred and there shall exist
no fact or circumstance which would have, or would be reasonably likely to have,
such an effect.

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<PAGE>
 
          (e) Tax Opinion.  Sierra Pacific shall have received an opinion of
counsel, in form and substance satisfactory to Sierra Pacific, dated the Closing
Date, to the effect that (i) the First Merger will be a tax-free transaction
under the Code and that Sierra Pacific, Lake Merger Sub and the stockholders of
Sierra Pacific who exchange their shares solely for the stock of Sierra Pacific
will recognize no gain or loss for federal income tax purposes as a result of
the consummation of the First Merger and (ii) the Second Merger will be a tax-
free reorganization under the Code and that Nevada Power, Desert Merger Sub and
the stockholders of Nevada Power who exchange their shares solely for the shares
of Sierra Pacific will recognize no gain or loss for federal income tax purposes
as a result of the consummation of the Second Merger.

          (f) Nevada Power Required Consents.  The material Nevada Power
Required Consents shall have been obtained.

          (g) Trigger of Nevada Power Rights.  No event that would result in the
triggering of any right or entitlement of Nevada Power stockholders under the
Nevada Power Rights Agreement, including a "flip-in" or "flip-over" or similar
event commonly described in such rights plans shall have occurred, which, in the
reasonable judgment of Sierra Pacific, would have or be reasonably likely to
result in a Nevada Power Material Adverse Effect or materially change the number
of outstanding equity securities of Nevada Power, and the Nevada Power Rights
shall not have become nonredeemable by any action of the Nevada Power Board of
Directors.

          (h) Cancellation of Nevada Power Preferred Stock.  Each issued and
outstanding share of Nevada Power Preferred Stock shall have been redeemed or
otherwise retired in accordance with its terms.

          Section 8.3  Conditions to Obligations of Nevada Power to Effect the
Mergers. The obligations of Nevada Power to effect the Mergers is further
subject to the satisfaction, prior to the Closing Date, of the following
conditions, except as may be waived by Nevada Power in writing pursuant to
Section 9.5:

          (a) Performance of Obligations.  Each of Sierra Pacific, Lake Merger
Sub and Desert Merger Sub will have performed in all material respects its
agreements and covenants contained in or contemplated by this Agreement required
to be performed at or prior to the Effective Time.

          (b) Representations and Warranties.  The representations and
warranties of each of Sierra Pacific, Lake Merger Sub and Desert Merger Sub set
forth in this Agreement shall be true and correct in all material respects as of
the date hereof (except to the extent such representations and warranties speak
as of any other date) and as of the Closing Date as if made on and as of the
Closing Date, except as otherwise contemplated by this Agreement.

          (c) Closing Certificates.  Nevada Power shall have received
certificates signed by the chief executive officer and chief financial officer
of Sierra Pacific, dated the Closing Date, to the effect that, to the best of
each such officer's knowledge, the conditions set forth in Section 8.3(a) and 
Section 8.3(b) have been satisfied.

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<PAGE>
 
          (d) Sierra Pacific Material Adverse Effect.  No material adverse
effect on the business, operations, assets, prospects, financial condition or
the results of operations of Sierra Pacific and its subsidiaries taken as a
whole or on the consummation of this Agreement shall have occurred and there
shall exist no fact or circumstance which would have, or would be reasonably
likely to have, such an effect.

          (e) Tax Opinion.  Nevada Power shall have received an opinion of
counsel, in form and substance satisfactory to Nevada Power, dated the Closing
Date, to the effect that (i) the First Merger will be a tax-free transaction
under the Code and that Sierra Pacific, Lake Merger Sub and the stockholders of
Sierra Pacific who exchange their shares solely for the stock of Sierra Pacific
will recognize no gain or loss for federal income tax purposes as a result of
the consummation of the First Merger and (ii) the Second Merger will be a tax-
free reorganization under the Code and that Nevada Power, Desert Merger Sub and
the stockholders of Nevada Power who exchange their shares solely for the shares
of Sierra Pacific will recognize no gain or loss for federal income tax purposes
as a result of the consummation of the Second Merger.

          (f) Sierra Pacific Required Consents.  The material Sierra Pacific
Required Consents shall have been obtained.

          (g) Trigger of Sierra Pacific Rights.  No event that would result in
the triggering of any right or entitlement of Sierra Pacific stockholders under
any Sierra Pacific Rights Agreement, including a "flip-in" and "flip-over" or
similar event commonly described in such rights plans shall have occurred which,
in the reasonable judgment of Nevada Power, would have or be reasonably likely
to result in a Sierra Pacific Material Adverse Effect or materially change the
number of outstanding equity securities of Sierra Pacific, and the Sierra
Pacific Rights shall not have become unredeemable by the Sierra Pacific Board of
Directors.


                                   ARTICLE 9

                       TERMINATION, AMENDMENT AND WAIVER

          Section 9.1  Termination.  This Agreement may be terminated at any
time prior to the Closing Date, whether before or after approval by the
stockholders of the respective parties hereto contemplated by this Agreement:

          (a) by mutual written consent of the Boards of Directors of Nevada
Power and Sierra Pacific;

          (b) by any party hereto, by written notice to the other, if the
Effective Time shall not have occurred on or before the day that is eighteen
months after the date hereof (the "Initial Termination Date"); provided,
however, that the right to terminate the Agreement under this Section 9.1(b)
shall not be available to any party whose failure to fulfill any obligations
under this Agreement has been the cause of, or resulted in, the failure of the
Effective Time to occur on or before this date; and provided, further, that if
on the Initial Termination Date the conditions to the Closing set forth in
Section 8.1(e) shall not have been fulfilled but all other conditions to the 

                                      60
<PAGE>
 
Closing shall be fulfilled or shall be capable of being fulfilled, then the
Initial Termination Date shall be extended to the second anniversary of the date
hereof;

          (c) by any party hereto, by written notice to the other party, if the
Nevada Power Stockholders' Approval shall not have been obtained at a duly held
Nevada Power Special Meeting, including any adjournments thereof, or the Sierra
Pacific Stockholders' Approvals shall not have been obtained at duly held Sierra
Pacific Special Meeting, including any adjournments thereof;

          (d) by any party hereto, if any state or federal law, order, rule or
regulation is adopted or issued, which has the effect, as supported by the
written opinion of outside counsel for such party, of prohibiting either of the
Mergers, or by any party hereto, if any court of competent jurisdiction in the
United States or any State shall have issued an order, judgment or decree
permanently restraining, enjoining or otherwise prohibiting either of the
Mergers, and such order, judgment or decree shall have become final and
nonappealable;

          (e) by Sierra Pacific, at any time prior to the time at which the
Sierra Pacific Stockholders' Approval has been obtained, upon five days' prior
notice to Nevada Power, if, as a result of a Business Combination proposal by a
party other than Nevada Power or any of its affiliates, the Board of Directors
of Sierra Pacific determines in good faith, after considering applicable
provisions of state law, giving effect to all concessions that may be offered by
the other party and consulting with financial advisors and outside counsel, that
failing to accept the Business Combination proposal  could reasonably be
expected to be a breach of its fiduciary duties under applicable law; provided,
however, that prior to any such termination, Sierra Pacific shall, and shall
cause its respective financial and legal advisors to, negotiate with Nevada
Power to make such adjustments in the terms and conditions of this Agreement as
would enable Sierra Pacific to proceed with the Transactions contemplated herein
on such adjusted terms; provided further that, notwithstanding anything in this
Section 9.1(e) to the contrary, Sierra Pacific and Nevada Power intend this
Agreement to be an exclusive agreement and, accordingly, nothing in this
Agreement is intended to constitute a solicitation of a Business Combination
proposal, it being acknowledged and agreed that any such proposal would
interfere with the strategic advantages and benefits that Sierra Pacific and
Nevada Power expect to derive from this Agreement and the transactions
contemplated hereby;

          (f) by Nevada Power, at any time prior to the time at which the Nevada
Power Stockholders' Approval has been obtained, upon five days' prior notice to
Sierra Pacific, if, as a result of a Business Combination proposal by a party
other than Sierra Pacific or any of its affiliates, the Board of Directors of
Nevada Power determines in good faith, after considering applicable provisions
of state law, giving effect to all concessions that may be offered by the other
party and consulting with its financial advisors and outside counsel, that
failing to accept the Business Combination proposal could reasonably be expected
to be a breach of its fiduciary duties under applicable law; provided, however,
that prior to any such termination, Nevada Power shall, and shall cause its
respective financial and legal advisors to, negotiate with Sierra Pacific to
make such adjustments in the terms and conditions of this Agreement as would
enable Nevada Power to proceed with the transactions contemplated herein on such
adjusted terms; provided further that, notwithstanding anything in this Section
9.1(f) to the contrary, Sierra Pacific and Nevada Power 

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<PAGE>
 
intend this Agreement to be an exclusive agreement and, accordingly, nothing in
this Agreement is intended to constitute a solicitation of a Business
Combination proposal, it being acknowledged and agreed that any such proposal
would interfere with the strategic advantages and benefits that Sierra Pacific
and Nevada Power expect to derive from this Agreement and the transactions
contemplated hereby;

          (g) by Sierra Pacific, by written notice to Nevada Power, if (i) there
exist inaccuracies of the representations and warranties of Nevada Power made
herein as of the date hereof, which inaccuracies, individually or in the
aggregate, would or would be reasonably likely to result in a Nevada Power
Material Adverse Effect, and such inaccuracies shall not have been remedied
within 20 days after receipt by Nevada Power of notice in writing from Sierra
Pacific, specifying the nature of such inaccuracies and requesting that they be
remedied, (ii) Nevada Power (and/or its appropriate subsidiaries) shall not have
performed and complied with its agreements and covenants contained in Sections
6.1(b) and 6.1(c) or shall have failed to perform and comply with, in all
material respects, its other agreements and covenants hereunder and such failure
to perform or comply shall not have been remedied within 20 days after receipt
by Nevada Power of notice in writing from Sierra Pacific, specifying the nature
of such failure and requesting that it be remedied; or (iii) the Board of
Directors of Nevada Power or any committee thereof (A) shall withdraw or modify
in any manner adverse to Sierra Pacific its approval or recommendation of this
Agreement or the Mergers, (B) shall approve or recommend any acquisition of
Nevada Power or a material portion of its assets or any tender offer for shares
of capital stock of Nevada Power, in each case, by a party other than Sierra
Pacific or any of its affiliates or (C) shall resolve to take any of the actions
specified in clause (A) or (B);

          (h) by Nevada Power, by written notice to Sierra Pacific, if (i) there
exist inaccuracies of the representations and warranties of Sierra Pacific made
herein as of the date hereof, which inaccuracies, individually or in the
aggregate, would or would be reasonably likely to result in a Sierra Pacific
Material Adverse Effect, and such inaccuracies shall not have been remedied
within 20 days after receipt by Sierra Pacific of notice in writing from Nevada
Power, specifying the nature of such inaccuracies and requesting that they be
remedied, (ii) Sierra Pacific (and/or its appropriate subsidiaries) shall not
have performed and complied with its agreements and covenants contained in
Sections 6.1(b) and 6.1(c) or shall have failed to perform and comply with, in
all material respects, its other agreements and covenants hereunder and such
failure to perform or comply shall not have been remedied within 20 days after
receipt by Sierra Pacific of notice in writing from Nevada Power, specifying the
nature of such failure and requesting that it be remedied; or (iii) the Board of
Directors of Sierra Pacific or any committee thereof (A) shall withdraw or
modify in any manner adverse to Nevada Power its approval or recommendation of
this Agreement or the Mergers, (B) shall approve or recommend any acquisition of
Sierra Pacific or a material portion of its assets or any tender offer for
shares of capital stock of Sierra Pacific, in each case, by a party other than
Nevada Power or any of its affiliates or (C) shall resolve to take any of the
actions specified in clause (A) or (B);

          (i) by Sierra Pacific, by written notice to Nevada Power, if (A) a
third party acquires securities representing greater than 50% of the voting
power of the outstanding voting securities of Nevada Power or (B) individuals
who as of the date hereof constitute the board of directors of Nevada Power
(together with any new directors whose election by such board of 

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<PAGE>
 
directors or whose nomination for election by the stockholders of Nevada Power
was approved by a vote of a majority of the directors of Nevada Power then still
in office who are either directors as of the date hereof or whose election or
nomination for election was previously so approved) cease for any reason to
constitute a majority of the board of directors of Nevada Power then in office;

          (j) by Nevada Power, by written notice to Sierra Pacific, if (A) a
third party acquires securities representing greater than 50% of the voting
power of the outstanding voting securities of Sierra Pacific or (B) individuals
who as of the date hereof constitute the board of directors of Sierra Pacific
(together with any new directors whose election by such board of directors or
whose nomination for election by the stockholders of Sierra Pacific was approved
by a vote of a majority of the directors of Sierra Pacific then still in office
who are either directors as of the date hereof or whose election or nomination
for election was previously so approved) cease for any reason to constitute a
majority of the board of directors of Sierra Pacific then in office.

          Section 9.2  Effect of Termination.  In the event of termination of
this Agreement by either Nevada Power or Sierra Pacific pursuant to Section 9.1,
there shall be no liability on the part of either Nevada Power or Sierra Pacific
or their respective officers or directors hereunder, except that (i) Section
7.18 and Section 9.3 and the agreement contained in the last sentence of Section
7.1 shall survive any such termination, and (ii) no such termination shall
relieve any party from liability by reason of any wilful breach of any
representation, warranty or covenant contained in this Agreement.

          Section 9.3  Termination Fee; Expenses.

          (a) Expenses Payable upon Non-Wilful Breach.  If this Agreement is
terminated at such time that this Agreement is terminable pursuant to one (but
not both) of (x) Section 9.1(g)(i) or (ii) or (y) Section 9.1(h)(i) or (ii),
then (i) the breaching party shall promptly (but not later than five business
days after receipt of notice from the other party) pay to the other party an
amount equal to all documented out-of-pocket expenses and fees incurred by the
other party (including, without limitation, fees and expenses payable to all
legal, accounting, financial, public relations and other professional advisors
arising out of, in connection with or related to the Mergers or the other
transactions contemplated by this Agreement) not to exceed $10 million in the
aggregate ("Out-of-Pocket Expenses"); provided, however, that, (i) if this
Agreement is terminated by a party as a result of a willful breach by the other
party, the non-breaching party may pursue any remedies available to it at law or
in equity and shall, in addition to its Out-of-Pocket Expenses (which shall be
paid as specified above and shall not be limited to $10 million), be entitled to
recover such additional amounts as such non-breaching party may be entitled to
receive at law or in equity; and (ii) if (x) at the time of the breaching
party's willful breach of this Agreement, there shall have been a third-party
tender offer for shares of, or a third party offer or proposal with respect to a
Business Combination involving, such party or any of its affiliates which at the
time of such termination shall not have been rejected by such party and its
board of directors and withdrawn by the third party, and (y) within two and one-
half years of any termination by the non-breaching party, the breaching party or
an affiliate thereof becomes a subsidiary of such offeror or a subsidiary of an
affiliate of such offeror or accepts a written offer to consummate or
consummates a Business Combination with such offeror or an

                                      63
<PAGE>
 
affiliate thereof, then such breaching party (jointly and severally with its
affiliates), upon the signing of a definitive agreement relating to such a
Business Combination, or, if no such agreement is signed then at the closing
(and as a condition to the closing) of such breaching party becoming such a
subsidiary or of such Business Combination, will pay to the non-breaching party
a fee equal to $52.5 million in cash minus any amounts as may have been
previously paid by the breaching party as Out-of-Pocket Expenses; provided that
in no event shall the termination fee provided for in Section 9.3(b) be payable
if the fee referred to in this Section 9.3(a)(ii) has been paid.

          (b) Termination Fee In Certain Other Events.

                 (i) If (A) this Agreement (w) is terminated by Sierra Pacific
          pursuant to Section 9.1(e), (x) is terminated by Nevada Power pursuant
          to Section 9.1(h)(iii), (y) is terminated pursuant to Section 9.1(c)
          following a failure of the stockholders of Sierra Pacific to grant the
          necessary approvals described in Section 4.13 (provided that the
          stockholders of Nevada Power shall not also have failed to grant the
          necessary approvals described in Section 5.13) or (z) is terminated as
          a result of Sierra Pacific's material breach of Section 7.4, and (B)
          at the time of such termination or prior to the meeting of Sierra
          Pacific's stockholders there shall have been a third-party tender
          offer for shares of, or a third-party offer or proposal with respect
          to a Business Combination involving, Sierra Pacific or any of its
          affiliates which at the time of such termination or of the meeting of
          Sierra Pacific's stockholders shall not have been (1) rejected by
          Sierra Pacific and its board of directors and (2) withdrawn by the
          third-party, and (C) within two and one-half years of any such
          termination described in clause (A) above, Sierra Pacific or its
          affiliate which is the subject of the tender offer or offer or
          proposal with respect to a Business Combination (the "Sierra Pacific
          Target Party") becomes a subsidiary of such offeror or a subsidiary of
          an affiliate of such offeror or accepts a written offer to consummate
          or consummates a Business Combination with such offeror or affiliate
          thereof, then such Sierra Pacific Target Party (jointly and severally
          with its affiliates), upon the signing of a definitive agreement
          relating to such a Business Combination, or, if no such agreement is
          signed, then at the closing (and as a condition to the closing) of
          such Sierra Pacific Target Party becoming such a subsidiary or of such
          Business Combination, will pay to Nevada Power a termination fee equal
          to $52.5 million in cash minus any amounts as may have been previously
          paid by the Sierra Pacific Target Party as Out-of-Pocket Expenses.

                                      64
<PAGE>
 
               (ii) If (A) this Agreement (w) is terminated by Nevada Power
          pursuant to Section 9.1(f), (x) is terminated by Sierra Pacific
          pursuant to Section 9.1(g)(iii), (y) is terminated pursuant to Section
          9.1(c) following a failure of the stockholders of Nevada Power to
          grant the necessary approvals described in Section 5.13 (provided that
          the stockholders of Sierra Pacific shall not also have failed to grant
          the necessary approvals described in Section 4.13) or (z) is
          terminated as a result of Nevada Power's material breach of Section
          7.4, and (B) at the time of such termination or prior to the meeting
          of Nevada Power's stockholders there shall have been a third-party
          tender offer for shares of, or a third-party offer or proposal with
          respect to a Business Combination involving, Nevada Power or any of
          its affiliates which at the time of such termination or of the meeting
          of Nevada Power's stockholders shall not have been (1) rejected by
          Nevada Power and its board of directors and (2) withdrawn by the 
          third-party, and (C) within two and one-half years of any such
          termination described in clause (A) above, Nevada Power or its
          affiliate which is the subject of the tender offer or offer or
          proposal with respect to a Business Combination (the "Nevada Power
          Target Party") becomes a subsidiary of such offeror or a subsidiary of
          an affiliate of such offeror or accepts a written offer to consummate
          or consummates a Business Combination with such offeror or affiliate
          thereof, then such Nevada Power Target Party (jointly and severally
          with its affiliates), upon the signing of a definitive agreement
          relating to such a Business Combination, or, if no such agreement is
          signed, then at the closing (and as a condition to the closing) of
          such Nevada Power Target Party becoming such a subsidiary or of such
          Business Combination, will pay to Sierra Pacific a termination fee
          equal to $52.5 million in cash minus any amounts as may have been
          previously paid by the Nevada Power Target Party as Out-of-Pocket
          Expenses.

          (c) Expenses.  The parties agree that the agreements contained in this
Section 9.3 are an integral part of the transactions contemplated by the
Agreement and constitute liquidated damages and not a penalty. If one party
fails to promptly pay to the other any fees due hereunder, the defaulting party
shall pay the costs and expenses (including legal fees and expenses) in
connection with any action, including the filing of any lawsuit or other legal
action, taken to collect payment, together with interest on the amount of any
unpaid fee at the publicly announced prime rate of Wells Fargo from the date
such fee was required to be paid.

          Section 9.4  Amendment.  This Agreement may be amended by the parties 
hereto pursuant to action of their respective Boards of Directors, at any time
before or after approval hereof by the stockholders of Nevada Power and Sierra
Pacific and prior to the Effective Time, but after such approvals, no such
amendment shall (i) alter or change the amount or kind of shares, rights or any
of the proceedings of the exchange and/or conversion under Article 2 and (ii)
alter or change any of the terms and conditions of this Agreement if any of the
alterations or changes, alone or in the aggregate, would materially and
adversely affect the rights of holders of Nevada Power Common Stock, Nevada
Power Preferred Stock or Sierra Pacific Common Stock. This Agreement may not be
amended except by an instrument in writing signed on behalf of each of the
parties hereto.

                                      65
<PAGE>
 
          Section 9.5  Waiver.  At any time prior to the Effective Time, the
parties hereto may (a) extend the time for the performance of any of the
obligations or other acts of the other parties hereto, (b) waive any
inaccuracies in the representations and warranties contained herein or in any
document delivered pursuant hereto and (c) waive compliance with any of the
agreements or conditions contained herein.  Any agreement on the part of a party
hereto to any such extension or waiver shall be valid if set forth in an
instrument in writing signed by a duly authorized officer of such party.


                                   ARTICLE 10

                               GENERAL PROVISIONS

          Section 10.1  Non-Survival of Representations, Warranties, Covenants
and Agreements.  All representations, warranties, covenants and agreements in
this Agreement shall not survive the Mergers, except the covenants and
agreements contained in this Section 10.1, the last sentence of Section 7.1 and
Sections 7.5, 7.9, 7.10, 7.11, 7.14, 7.15, 7.16, 7.18 and 10.7, each of which 
shall survive in accordance with its terms.

          Section 10.2  Brokers.  Nevada Power represents and warrants that,
except for PaineWebber Incorporated, its investment banking firm, no broker,
finder or investment banker is entitled to any brokerage, finder's or other fee
or commission in connection with the Mergers or the transactions contemplated by
this Agreement based upon arrangements made by or on behalf of Nevada Power.
Sierra Pacific represents and warrants that, except for SG Barr Devlin and
Merrill Lynch, its investment banking firms, no broker, finder or investment
banker is entitled to any brokerage, finder's or other fee or commission in
connection with the Mergers or the transactions contemplated by this Agreement
based upon arrangements made by or on behalf of Sierra Pacific.

          Section 10.3  Notices.  All notices and other communications
hereunder shall be in writing and shall be deemed given if (i) delivered
personally, or (ii) sent by overnight courier service (receipt confirmed in
writing), or (iii) delivered by facsimile transmission (with receipt confirmed),
or (iv) five days after being mailed by registered or certified mail (return
receipt requested) to the parties at the following addresses (or at such other
address for a party as shall be specified by like notice):

          (a)  If to Nevada Power, to:

                         Nevada Power Company
                         6226 West Sahara Avenue
                         Las Vegas, Nevada 89102

                         Attention:   Corporate Secretary
                                      Telephone: (702) 367-5000
                                      Telecopy: (702) 367-5004

                                      66
<PAGE>
 
                    with a copy to:

                         Jones, Day, Reavis & Pogue
                         77 West Wacker
                         Chicago, Illinois 60601-1692

                         Attention:   Robert A. Yolles, Esq.
                                      Telephone: (312) 782-3939
                                      Telecopy: (312) 782-8585

          (b)  If to Sierra Pacific, to:

                         Sierra Pacific Resources
                         6100 Neil Road
                         Reno, Nevada 89511

                         Attention:   Corporate Secretary
                                      Telephone: (702) 689-3600
                                      Telecopy: (702) 689-5463

                    with a copy to:

                         Skadden, Arps, Slate, Meagher & Flom LLP
                         919 Third Avenue
                         New York, New York 10022

                         Attention:   Sheldon S. Adler, Esq.
                                      Telephone: (212) 735-3000
                                      Telecopy: (212) 735-2000

          Section 10.4  Miscellaneous.  This Agreement (including the documents
and instruments referred to herein) (i) constitutes the entire agreement and
supersedes all other prior agreements and understandings, both written and oral,
among the parties, or any of them, with respect to the subject matter hereof
other than the Confidentiality Agreement; (ii) shall not be assigned by
operation of law or otherwise; and (iii) shall be governed by and construed in
accordance with the laws of the State of Nevada applicable to contracts executed
in and to be fully performed in such State, without giving effect to its
conflicts of law, rules or principles.

          Section 10.5  Interpretation.  When a reference is made in this
Agreement to Sections or Exhibits, such reference shall be to a Section or
Exhibit of this Agreement, respectively, unless otherwise indicated.  The table
of contents and headings contained in this Agreement are for reference purposes
only and shall not affect in any way the meaning or interpretation of this
Agreement.  Whenever the words, "include," "includes," or "including" are used
in this Agreement, they shall be deemed to be followed by the words "without
limitation."

                                      67
<PAGE>
 
          Section 10.6  Counterparts; Effect.  This Agreement may be executed
in one or more counterparts, each of which shall be deemed to be an original,
but all of which shall constitute one and the same agreement.

          Section 10.7  Parties in Interest.  This Agreement shall be binding
upon and inure solely to the benefit of each party hereto, and, except for
rights of Indemnified Parties as set forth in Section 7.5, nothing in this
Agreement, express or implied, is intended to confer upon any persons, any
rights or remedies of any nature whatsoever under or by reason of this
Agreement.  Notwithstanding the foregoing and any other provision of this
Agreement, and in addition to any other required action of the Board of
Directors of Sierra Pacific (a) a majority of the Sierra Pacific Directors (or
their successors) serving on the Board of Directors of Sierra Pacific who are
designated by Sierra Pacific pursuant to Section 7.13 shall be entitled during
the three year period commencing at the Effective Time (the "Three Year Period")
to enforce the provisions of the final sentence of Section 7.13 and Section 7.14
on behalf of the Sierra Pacific officers, directors and employees, as the case
may be, and (b) a majority of the Nevada Power directors (or their successors)
serving on the Board of Directors of Sierra Pacific who are designated by Nevada
Power pursuant to Section 7.13 shall be entitled during the Three Year Period to
enforce the provisions of Section 7.9, Section 7.10, Section 7.11, the final
sentence of Section 7.13 and Section 7.14, on behalf of the Nevada Power
officers, directors and employees, as the case may be. Such directors' rights
and remedies under the preceding sentence are cumulative and are in addition to
any other rights and remedies they may have at law or in equity, but in no event
shall this Section 10.7 be deemed to impose any additional duties on any such
directors. Sierra Pacific shall pay, at the time they are incurred, all
reasonable costs, fees and expenses of such directors incurred in connection
with the assertion of any rights on behalf of the persons set forth above
pursuant to this Section 10.7.

          Section 10.8  Further Assurances.  Each party will execute such
further documents and instruments and take such further actions as may
reasonably be requested by any other party in order to consummate the Mergers in
accordance with the terms hereof.

                                      68
<PAGE>
 
          IN WITNESS WHEREOF, Nevada Power, Sierra Pacific, Desert Merger Sub
and Lake Merger Sub have caused this Agreement to be signed by their respective
officers thereunto duly authorized as of the date first written above.

                              NEVADA POWER COMPANY


                              By: /s/ Charles A. Lenzie
                                 ------------------------------
                                 Name: Charles A. Lenzie
                                 Title: Chairman and
                                        Chief Executive Officer


                              SIERRA PACIFIC RESOURCES


                              By: /s/ Malyn K. Malquist
                                 ------------------------------
                                 Name: Malyn K. Malquist
                                 Title: Chairman, President and
                                        Chief Executive Officer


                              DESERT MERGER SUB, INC.


                              By: /s/ Malyn K. Malquist
                                 ------------------------------
                                 Name: Malyn K. Malquist
                                 Title: Chairman, President and
                                        Chief Executive Officer


                              LAKE MERGER SUB, INC.


                              By: /s/ Malyn K. Malquist
                                 ------------------------------
                                 Name: Malyn K. Malquist
                                 Title: Chairman, President and
                                        Chief Executive Officer
<PAGE>

                                                               Merger Agreement
                                                                  Exhibit 7.8.1

 
                   [NEVADA POWER FORM OF AFFILIATE AGREEMENT]


                                     [DATE]

Nevada Power Company
6226 West Sahara Avenue
Las Vegas, NV 89102

Sierra Pacific Resources
6100 Neil Road
Reno, NV 89511


Ladies and Gentlemen:

     I have been advised that as of the date hereof I may be deemed to be an
"affiliate" of Nevada Power Company, a Nevada corporation ("Nevada Power"), as
the term "affiliate" is defined for purposes of paragraphs (c) and (d) of Rule
145 of the Rules and Regulations (the "Rules and Regulations") of the Securities
and Exchange Commission (the "Commission") under the Securities Act of 1933, as
amended (the "Act"). Pursuant to the terms of the Agreement and Plan of Merger
dated as of April 29, 1998 (the "Agreement"), between Nevada Power, Sierra
Pacific Resources, a Nevada corporation ("Sierra Pacific"), Desert Merger Sub,
Inc., a Nevada corporation and a wholly owned subsidiary of Sierra Pacific
("Desert Merger Sub") and Lake Merger Sub, Inc. a Nevada corporation and a
wholly owned subsidiary of Sierra Pacific ("Lake Merger Sub"), Nevada Power will
be merged with and into Desert Merger Sub (the "Merger").

     As a result of the Merger, I may receive shares of Common Stock, $1.00 par
value, of Sierra Pacific ("Sierra Pacific Common Stock") in exchange for shares
owned by me of Common Stock, $1.00 par value, of Nevada Power ("Nevada Power
Common Stock"). The Sierra Pacific Common Stock together with the associated
purchase rights (the "Sierra Pacific Rights") received in exchange for shares of
Nevada Power Common Stock are referred to herein collectively as the "Sierra
Pacific Securities".

     I represent, warrant and covenant to Sierra Pacific and Nevada Power that
in the event I receive any Sierra Pacific Securities as a result of the Merger:

          A.  I shall not make any sale, transfer or other disposition of the
     Sierra Pacific Securities in violation of the Act or the Rules and
     Regulations.

          B.  I have carefully read this letter and the Agreement and discussed
     its requirements and other applicable limitations upon my ability to sell,
     transfer or otherwise dispose of Sierra Pacific Securities, to the extent I
     felt necessary, with my counsel or counsel for Nevada Power.
<PAGE>
 
          C.  I have been advised that the issuance of Sierra Pacific Securities
     to me pursuant to the Merger has been registered with the Commission under
     the Act on a Registration Statement on Form S-4. However, I have also been
     advised that, because at the time the Merger was submitted for a vote of
     the stockholders of Nevada Power, (a) I may be deemed to have been an
     affiliate of Nevada Power and (b) the distribution by me of the Sierra
     Pacific Securities has not been registered under the Act, I may not sell,
     transfer or otherwise dispose of Sierra Pacific Securities issued to me in
     the Merger unless (i) such sale, transfer or other disposition has been
     registered under the Act, (ii) such sale, transfer or other disposition is
     made in conformity with the volume and other limitations of Rule 145
     promulgated by the Commission under the Act, or (iii) in the opinion of
     counsel reasonably acceptable to Sierra Pacific, such sale, transfer or
     other disposition is otherwise exempt from registration under the Act.

          D.  I understand that, except as provided in the Agreement in Section
     7.11, Sierra Pacific is under no obligation to register the sale, transfer
     or other disposition of the Sierra Pacific Securities by me or on my behalf
     under the Act or to take any other action necessary in order to make
     compliance with an exemption from such registration available.

          E.  I also understand that stop transfer instructions will be given to
     Sierra Pacific's transfer agents with respect to the Sierra Pacific
     Securities and that there will be placed on the certificates for the Sierra
     Pacific Securities issued to me, or any substitutions therefor, a legend
     stating in substance:

               "The shares represented by this certificate were issued in a
          transaction to which Rule 145 promulgated under the Securities Act of
          1933 applies. The shares represented by this certificate may only be
          transferred in accordance with the terms of an agreement dated
          _______________ between the registered holder hereof and Sierra
          Pacific, a copy of which agreement is on file at the principal offices
          of Sierra Pacific."

          F.  I also understand that unless the transfer by me of my Sierra
     Pacific Securities has been registered under the Act or is a sale made in
     conformity with the provisions of Rule 145, Sierra Pacific reserves the
     right to put the following legend on the certificates issued to my
     transferee:

               "The shares represented by this certificate have not been
          registered under the Securities Act of 1933 and were acquired from a
          person who received such shares in a transaction to which Rule 145
          promulgated under the Securities Act of 1933 applies. The shares have
          been acquired by the holder not with a view to, or for resale in
          connection with, any distribution thereof within the meaning of the
          Securities Act of 1933 and may not be sold, pledged or otherwise
          transferred except in accordance with an exemption from the
          registration requirements of the Securities Act of 1933."

                                       2
<PAGE>
 
     It is understood and agreed that the legend set forth in paragraph E or F
above, as the case may be, shall be removed by delivery of substitute
certificates without such legend if the undersigned shall have delivered to
Sierra Pacific a copy of a letter from the staff of the Commission, or an
opinion of counsel in form and substance reasonably satisfactory to Sierra
Pacific, to the effect that such legend is not required for purposes of the Act.

     By its acceptance hereof, Sierra Pacific agrees, for a period of two years
after the Effective Time of the Second Merger (as defined in the Agreement),
that it, as the surviving corporation, will file on a timely basis all reports
required to be filed by it pursuant to Section 13 of the Securities Exchange Act
of 1934, as amended, so that the public information provisions of Rule 144(c)
under the Act are satisfied and the resale provisions of Rules 145(d)(1) and (2)
under the Act are therefore available to me in the event I desire to transfer
any Sierra Pacific Securities issued to me in the Merger.

                [Remainder of this page is intentionally blank.]

                                       3
<PAGE>
 
     By signing this letter, without limiting or abrogating my agreements set
forth above, I do not admit that I am an "affiliate" of Nevada Power within the
meaning of the Act or the Rules and Regulations, and I do not waive any right I
may have to object to any assertion that I am such an affiliate.

                                    Very truly yours,



                                    __________________________________
                                    Name:


Accepted this ____ day of
_____________, 199_, by



Nevada Power Company


By:_______________________________
     Name:
     Title:
   



Sierra Pacific Resources


By:_______________________________
     Name:
     Title:

                                       4
<PAGE>
 
                                                               Merger Agreement
                                                                  Exhibit 7.8.2

                  [SIERRA PACIFIC FORM OF AFFILIATE AGREEMENT]


                                     [DATE]


Sierra Pacific Resources
6100 Neil Road
Reno, NV 89511

Nevada Power Company
6226 West Sahara Avenue
Las Vegas, NV 89102


Ladies and Gentlemen:

     I have been advised that as of the date hereof I may be deemed to be an
"affiliate" of Sierra Pacific Resources, a Nevada corporation ("Sierra
Pacific"), as the term "affiliate" is defined for purposes of paragraphs (c) and
(d) of Rule 145 of the Rules and Regulations (the "Rules and Regulations") of
the Securities and Exchange Commission (the "Commission") under the Securities
Act of 1933, as amended (the "Act"). Pursuant to the terms of the Agreement and
Plan of Merger dated as of  May 29, 1998 (the "Agreement"), between Nevada Power
Company, a Nevada corporation ("Nevada Power"), Sierra Pacific, Desert Merger
Sub, Inc. a Nevada corporation and a wholly owned subsidiary of Sierra Pacific
("Desert Merger Sub") and Lake Merger Sub, a Nevada corporation and a wholly
owned subsidiary of Sierra Pacific ("Lake Merger Sub"), Lake Merger Sub will be
merged with and into Sierra Pacific and Nevada Power will be merged with and
into Desert Merger Sub (the "Merger").

     As a result of the Merger, I may receive shares of Common Stock, $1.00 par
value, of  Sierra Pacific ("Sierra Pacific Common Stock") in exchange for shares
owned by me of Common Stock, $1.00 par value, of Nevada Power ("Nevada Power
Common Stock").  The Sierra Pacific Common Stock together with the associated
purchase rights (the "Sierra Pacific Rights") received in exchange for share of
Sierra Pacific Common Stock are referred to herein collectively as the "Sierra
Pacific Securities".

     I represent, warrant and covenant to Sierra Pacific and Nevada Power that
in the event I receive any Sierra Pacific Securities as a result of the Merger:

          A.  I shall not make any sale, transfer or other disposition of the
     Sierra Pacific Securities in violation of the Act or the Rules and
     Regulations.

          B.  I have carefully read this letter and the Agreement and discussed
     its requirements and other applicable limitations upon my ability to sell,
     transfer or otherwise
<PAGE>
 
     dispose of Sierra Pacific Securities, to the extent I felt necessary, with
     my counsel or counsel for Sierra Pacific.

          C.  I have been advised that the issuance of Sierra Pacific Securities
     to me pursuant to the Merger has been registered with the Commission under
     the Act on a Registration Statement on Form S-4. However, I have also been
     advised that, because at the time the Merger was submitted for a vote of
     the stockholders of Sierra Pacific, (a) I may be deemed to have been an
     affiliate of Sierra Pacific and (b) the distribution by me of the Sierra
     Pacific Securities has not been registered under the Act, I may not sell,
     transfer or otherwise dispose of Sierra Pacific Securities issued to me in
     the Merger unless (i) such sale, transfer or other disposition has been
     registered under the Act, (ii) such sale, transfer or other disposition is
     made in conformity with the volume and other limitations of Rule 145
     promulgated by the Commission under the Act, or (iii) in the opinion of
     counsel reasonably acceptable to Sierra Pacific, such sale, transfer or
     other disposition is otherwise exempt from registration under the Act.

          D.  I understand that, except as provided in the Agreement in Section
     7.11, Sierra Pacific is under no obligation to register the sale, transfer
     or other disposition of the Sierra Pacific Securities by me or on my behalf
     under the Act or to take any other action necessary in order to make
     compliance with an exemption from such registration available.

          E.  I also understand that stop transfer instructions will be given to
     Sierra Pacific's transfer agents with respect to the Sierra Pacific
     Securities and that there will be placed on the certificates for the Sierra
     Pacific Securities issued to me, or any substitutions therefor, a legend
     stating in substance:

               "The shares represented by this certificate were issued in a
          transaction to which Rule 145 promulgated under the Securities Act of
          1933 applies. The shares represented by this certificate may only be
          transferred in accordance with the terms of an agreement dated
          ________________ between the registered holder hereof and Sierra
          Pacific, a copy of which agreement is on file at the principal offices
          of Sierra Pacific."

          F.  I also understand that unless the transfer by me of my Sierra
     Pacific Securities has been registered under the Act or is a sale made in
     conformity with the provisions of Rule 145, Sierra Pacific reserves the
     right to put the following legend on the certificates issued to my
     transferee:

               "The shares represented by this certificate have not been
          registered under the Securities Act of 1933 and were acquired from a
          person who received such shares in a transaction to which Rule 145
          promulgated under the Securities Act of 1933 applies. The shares have
          been acquired by the holder not with a view to, or for resale in
          connection with, any distribution thereof within the meaning of the
          Securities Act of 1933 and may not be sold, pledged or otherwise

                                       2
<PAGE>
 
          transferred except in accordance with an exemption from the
          registration requirements of the Securities Act of 1933."

     It is understood and agreed that the legend set forth in paragraph E or F
above, as the case may be, shall be removed by delivery of substitute
certificates without such legend if the undersigned shall have delivered to
Sierra Pacific a copy of a letter from the staff of the Commission, or an
opinion of counsel in form and substance reasonably satisfactory to Sierra
Pacific, to the effect that such legend is not required for purposes of the Act.

     By its acceptance hereof, Sierra Pacific agrees, for a period of two years
after the Effective Time of the Second Merger (as defined in the Agreement),
that it, as the surviving corporation, will file on a timely basis all reports
required to be filed by it pursuant to Section 13 of the Securities Exchange Act
of 1934, as amended, so that the public information provisions of Rule 144(c)
under the Act are satisfied and the resale provisions of Rules 145(d)(1) and (2)
under the Act are therefore available to me in the event I desire to transfer
any Sierra Pacific Securities issued to me in the Merger.

                [Remainder of this page is intentionally blank.]

                                       3
<PAGE>
 
     By signing this letter, without limiting or abrogating my agreements set
forth above, I do not admit that I am an "affiliate" of Sierra Pacific within
the meaning of the Act or the Rules and Regulations, and I do not waive any
right I may have to object to any assertion that I am such an affiliate.

                                    Very truly yours,



                                    _______________________________
                                    Name:


Accepted this ____ day of
_____________, 199_, by



Sierra Pacific Resources


By:_______________________________
     Name:
     Title:
 



Nevada Power Company


By:_______________________________
     Name:
     Title:

                                       4
<PAGE>
                                                               Merger Agreement
                                                                 Exhibit 7.15.1


                              EMPLOYMENT AGREEMENT



     This EMPLOYMENT AGREEMENT (the "Agreement"), dated as of _____________,
1998, but effective as provided herein, is made and entered into by and between
Sierra Pacific Resources, a Nevada corporation (the "Company"), and Michael R.
Niggli (the "Executive").

     WHEREAS, the Executive has been serving as the President and Chief
Operating Officer of Nevada Power Company, a Nevada corporation ("Nevada
Power");

     WHEREAS, the Company and Nevada Power have executed a merger agreement (the
"Merger Agreement") which contemplates the merger (the "Merger") of Nevada Power
with and into a subsidiary ("Desert Sub") of the Company, with Desert Sub (to be
renamed Nevada Power Company) as the survivor (the "Surviving Company") and
certain other transactions, all of which will become effective at the Effective
Time (as defined in the Merger Agreement);

     WHEREAS, in order to induce Executive to serve, on and after the Effective
Time, as the Chairman of the Board and Chief Executive Officer of the Company
and Chairman of the Board of each of Sierra Pacific Power Company and Surviving
Company (collectively, the "Utility Subsidiaries"), the Company desires to
provide Executive with compensation and other benefits on the terms and
conditions set forth in this Agreement;

     WHEREAS, the Company considers it in the best interests of its stockholders
to foster the continuous employment of certain key management personnel;

     WHEREAS, the Company recognizes that, as is the case for most publicly held
companies, the possibility of a Change in Control (as defined herein) exists;

     WHEREAS, the Company wishes to assure itself of continuation of management
following the Effective Time, including in the event of a Change in Control; and

     WHEREAS, the Company wishes to employ the Executive and the Executive is
willing to render services, both on the terms and subject to the conditions set
forth in this Agreement;

     NOW, THEREFORE, in consideration of the promises and of the mutual
covenants herein contained, it is agreed as follows:
<PAGE>
 
     1.   Employment.

          1.1  The Company hereby agrees to employ the Executive, and the 
Executive hereby agrees to undertake employment with the Company, upon the terms
and conditions herein set forth.

          1.2  Employment will be for a term commencing on the Effective Time 
(the "Effective Date") and, subject to earlier expiration upon the Executive's
termination under Section 5, expiring on the third anniversary of the Effective
Time (the "Employment Term").  The Employment Term may be extended by mutual
written agreement of the parties.  In the event a Change in Control (as defined
in Section 6.2) occurs less than three years before the end of the Employment
Term, the Employment Term will be extended for a period ending on the third
anniversary of the occurrence of the Change in Control, except that in the event
the occurrence of a Change in Control as described in Section 6.2(iv) occurs
less than three years before the end of the Employment Term, the Employment Term
will be extended for a period ending on the later of (i) the third anniversary
of the occurrence of such Change in Control or (ii) the earlier of (a) the day
after any transaction, occurrence or event described in any agreement,
announcement or resolution referred to in Section 6.2(iv) (a "Transaction") is
consummated or (b) the date it is determined by resolution of the Board of
Directors of the Company (the "Board") adopted in good faith that such
Transaction will not be consummated.  (The Employment Term, as so extended under
this Section 1.2, will thereafter constitute the "Employment Term" hereunder and
is subject to further extension as provided in this Section 1.2.)

     2.   Positions and Duties.

          2.1  Positions and Duties. During the Employment Term, the Executive 
will serve in the positions of Chairman of the Board and Chief Executive Officer
of the Company and of Chairman of the Board of each of the Utility Subsidiaries,
and will have such powers, duties, functions, responsibilities and authority as
are (i) consistent with the Executive's position as the Company's most senior
executive officer and as Chairman of the Boards of Directors of the Company and
the Utility Subsidiaries; or (ii) assigned to his office in the Company's and
the Utility Subsidiaries' bylaws; or (iii) reasonably assigned to him by the
Board or the Board of Directors of the Utility Subsidiaries. The Executive will
report directly to the Board. The Company will use its best efforts to cause the
Executive to be elected as a member of the Board and as Chairman of the Board
throughout the Employment Term and will use its best efforts to cause him to be
included in the management slate for election as a director at every
stockholders' meeting at which his term as a director would otherwise expire. In
addition, the Company will cause the Executive to be elected a member of the
Board of Directors, and as Chairman thereof, of each Utility Subsidiary
throughout the Employment Term.

                                      -2-
<PAGE>
 
          2.2  Commitment.  During the Employment Term, the Executive will be 
the Company's full-time employee and, except as may otherwise be approved in
advance in writing by the Board, and except during vacation periods and
reasonable periods of absence due to sickness, personal injury or other
disability, the Executive will devote substantially all of his business time and
attention to the performance of his duties hereunder. Notwithstanding the
foregoing, the Executive may, (i) subject to the approval of the Board, serve as
a director of a company which is not engaged in "Competition" (as defined in
Section 9.1) with the Company or any Subsidiary (as defined in Section 6.2),
(ii) serve as an officer, director or otherwise participate in purely
educational, welfare, social, religious and civic organizations, and (iii)
manage personal and family investments.

     3.   Place of Performance.  In connection with his employment during the
Employment Term, unless otherwise agreed by the Executive, the Executive will
have offices at each of the Company's and Surviving Company's principal
executive offices. The Executive will undertake normal business travel on behalf
of the Company.

     4.   Compensation and Related Matters.

          4.1  Compensation.

               (i) Annual Base Salary. During the Employment Term, the Company
will pay to the Executive an annual base salary ("Base Salary") in such amount
as shall be commensurate with his position and level of responsibility as
determined by the Board (or the Compensation Committee thereof) in its sole
discretion from time to time; provided, however, that in no event shall such
Base Salary be less than the Executive's annual base salary at Nevada Power as
in effect immediately prior to the Effective Time. Base salary shall be payable
at the times and in the manner consistent with the Company's general policies
regarding compensation of executive employees. Base Salary may not be decreased.
The Board may from time to time authorize such additional compensation to the
Executive, in cash or in property, as the Board may determine in its sole
discretion to be appropriate.

               (ii) Annual Incentive Compensation. If the Board (or the
Compensation Committee thereof) authorizes any annual cash incentive
compensation or approves any other annual management incentive program or
arrangement, the Executive will be eligible to participate in such plan, program
or arrangement under the general terms and conditions applicable to executive
and management employees. The Executive's target payout under such annual
incentive compensation plans, programs and arrangements will be, subject to
achievement of applicable performance measures, on an annual level of not less
than a percentage of Base Salary equal to the target percentage of annual base
salary in effect for the Executive under Nevada Power's annual incentive
compensation plan immediately prior to

                                      -3-
<PAGE>
 
the Effective Time; provided, however, that such percentage shall in no event be
less than the target payout percentage applicable for the year to the President
and Chief Operating Officer of the Company.  Subject to the foregoing, nothing
in this Section 4.1(ii) will guarantee to the Executive any specific amount of
incentive compensation, or prevent the Board (or the Compensation Committee
thereof) from establishing performance goals and compensation targets applicable
only to the Executive.

               (iii) Long-Term Incentive Compensation Plans and Programs. If the
Board (or the Compensation Committee thereof) authorizes any long-term cash
incentive plan or program, the Executive will be eligible to participate in such
plan or program under the general terms and conditions applicable to executive
and management employees. The Executive's participation in any such plan or
program will be, subject to achievement of applicable performance measures, at
annual target level grant of not less than a percentage of Base Salary equal to
the most recent percentage of annual base salary granted to the Executive prior
to the Effective Time as a target level grant under Nevada Power's long-term
incentive plan; provided, however, that such percentage shall in no event be
less than the target level grant percentage applicable for the year to the
President and Chief Operating Officer of the Company. Subject to the foregoing,
nothing in this Section 4.1(iii) will guarantee the Executive any specific
amount of long-term incentive compensation, or prevent the Board (or the
Compensation Committee thereof) from establishing performance goals and
compensation targets applicable only to the Executive.

          4.2  Employee and Executive Benefits.  In addition to the compensation
described in Section 4.1 and subject to the following provisions of this Section
4, the Company will make or cause to be made available to the Executive and his
eligible dependents, subject to the terms and conditions of the applicable
plans, including without limitation the eligibility rules, participation in all
employee benefit plans, including all employee retirement income and welfare
benefit policies, plans, programs or arrangements, in which senior executives of
the Company participate from time to time, including any stock option, stock
purchase, stock appreciation, savings, pension, supplemental executive
retirement or other retirement income or welfare benefit, disability, salary
continuation, and any other deferred compensation, incentive compensation, group
and/or executive life, health, medical/hospital or other insurance (whether
funded by actual insurance or self-insured by the Company or an affiliate),
expense reimbursement or other employee benefit policies, plans, programs or
arrangements.

          4.3  Vacation and Fringe Benefits.  During the Employment Term, the
Executive shall be entitled to vacation in such amounts as would be available
under the Company's normal vacation policies applicable to senior executives, as
in effect from time to time, to an employee who as of the Effective Date would
have service with the Company equal to the aggregate of his

                                      -4-
<PAGE>
 
service with Nevada Power prior to the Effective Date plus an additional 26
years, such vacation to be taken in accordance such normal vacation policies;
and the Executive shall be entitled to the perquisites and other fringe benefits
made available to senior executives of the Company, commensurate with his
position and level of responsibility with the Company.

          4.4  Expenses.  The Company will promptly reimburse the Executive for
all travel and other business expenses the Executive incurs in order to perform
his duties to the Company under this Agreement in a manner commensurate with the
Executive's position and level of responsibility with the Company, and in
accordance with the Company's policy regarding substantiation of expenses.

          4.5  Relocation Expenses.  If the Company requests that the Executive
relocate after the Effective Date to the general area of the Company's current
headquarters in Reno, Nevada, the Company will pay the Executive and, where
applicable, upon substantiation of expenses (i) at the time of relocation a
relocation allowance equal to 1/24th of the Executive's Base Salary at the time
of relocation, (ii) an allowance for up to two months' rent for temporary
housing following relocation at a rate of not more than $2,000 per month, (iii)
any additional expenses incurred by the Executive associated with up to two
house hunting trips to the Reno, Nevada area for the Executive and his wife,
(iv) relocation expenses associated with moving the Executive's family and
household goods from Las Vegas, Nevada to the Reno, Nevada area, and (v) the
normal seller's broker's commission associated with the sale of the Executive's
existing residence in Las Vegas, Nevada.  In lieu of the payment provided for in
clause (v), the Executive may elect to have the Company purchase the Executive's
existing home in Las Vegas, Nevada at a price equal to the average of the fair
market values as reported in two appraisals submitted by appraisers jointly
agreed to by the Executive and the Company.

          4.6  Supplemental Retirement Benefits.  (i) The Executive will be 
eligible for a benefit under a supplemental retirement plan heretofore
established by Nevada Power for the Executive. The benefit, if any, to which the
Executive is entitled under such supplemental retirement plan will be payable at
the same time and in the same form as the benefit to which the Executive would
be entitled under the Surviving Company Retirement Plan (the "Qualified Plan")
if he were a participant therein and will be equal to:

          (a) the benefit to which the Executive would be entitled under the
     Qualified Plan (after application of the limitations included therein that
     are imposed by the Code, such as Code Sections 401(a)(17) and 415)
     determined as if the Executive (I) were a participant in the Qualified
     Plan, (II) had an additional twenty-six (26) "Years of Credited Service"
     under the Qualified Plan, and (III) had an

                                      -5-
<PAGE>
 
     additional twenty-six (26) "Years of Vesting Service" under the Qualified
     Plan, less

          (b) the sum of (I) the actual amount, if any, payable to or on behalf
     of the Executive under the Qualified Plan and (II) the actuarial equivalent
     amounts, if any, of the vested retirement benefits to which the Executive
     is entitled under any qualified or non-qualified defined benefit plan in
     which the Executive participated while previously employed by Entergy
     Services, Inc. and San Diego Gas & Electric Company or their affiliates
     (such amounts under clauses (a) and (b) to be determined without regard to
     any assignment of benefits under a qualified domestic relations order, and
     the actuarial equivalents under clause (b)(II) to be determined using the
     applicable actuarial assumptions as specified in the Qualified Plan).

          (ii)  The Executive will be eligible to continue to participate in the
Surviving Company Supplemental Executive Retirement Plan, as amended from time
to time (the "SERP").  For purposes of applying the SERP and without further
need to amend the SERP, the Executive will be credited with two (2) years of
"Service" under the SERP for each of the first five years of actual "Service"
thereunder.

     5.   Termination.  Notwithstanding the Employment Term specified in Section
1.2, the termination of the Executive's employment hereunder will be governed by
the following provisions:

          5.1  Death.  In the event of the termination of the Executive's
employment during the Employment Term by reason of the Executive's death, the
Company will pay to the Executive's beneficiaries or estate, as appropriate,
promptly after the Executive's death, (i) the unpaid Base Salary to which the
Executive is entitled, pursuant to Section 4.1, through the date of the
Executive's death, and (ii) for any accrued but unused vacation days, to the
extent and in the amounts, if any, provided under the usual policies and
arrangements, as modified by Section 4.3, which cover the Executive.  This
Section 5.1 will not limit the entitlement of the Executive's estate or
beneficiaries to any death or other benefits then available to the Executive
under any life insurance, stock ownership, stock options, or other benefit plan
or policy that is maintained by the Company or its affiliates for the
Executive's benefit or in which the Executive participated.

          5.2  Disability.

               (i) If the Executive has incurred a Disability (as defined below)
during the Employment Term, the Company may give the Executive written notice of
its intention to terminate the Executive's employment.  In such event, the
Executive's employment with the Company will terminate effective on the 30th
calendar day after receipt of such notice by the Executive,

                                      -6-
<PAGE>
 
provided that within the 30 calendar days after such receipt, the Executive will
not have returned to full-time performance of his duties.  The Executive will
continue to receive his Base Salary (less any amounts payable to the Executive
for such period under any short- or long-term disability plan maintained by the
Company or an affiliate) and benefits until the date of termination.  In the
event of the Executive's Disability, the Company will pay the Executive,
promptly after the Executive's termination, (a) the unpaid Base Salary to which
he is entitled, pursuant to Section 4.1, through the date of the Executive's
termination (less any amounts payable to the Executive for such period under any
short-or long-term disability plan maintained by the Company or an affiliate),
and (b) for any accrued but unused vacation days, to the extent and in the
amounts, if any, provided under the usual policies and arrangements, as modified
by Section 4.3, which cover the Executive.  This Section 5.2 will not limit the
entitlement of the Executive or the Executive's estate or beneficiaries to any
disability or other benefits then available to the Executive under any
disability insurance or other benefit plan or policy that is maintained by the
Company or its affiliates for the Executive's benefit or in which the Executive
participated.

               (ii) For purposes of this Agreement, "Disability" will mean the
Executive's incapacity due to physical or mental illness or injury substantially
to perform his duties on a full-time basis for six consecutive months and within
30 calendar days after a notice of termination is thereafter given by the
Company the Executive will not have returned to the full-time performance of the
Executive's duties; provided, however, if the Executive disagrees with a
determination to terminate him because of Disability, the question of the
Executive's Disability will be subject to the certification of a qualified
medical doctor agreed to by the Company and the Executive or, in the event of
the Executive's incapacity to designate a doctor, the Executive's legal
representative.  In the absence of agreement between the Company and the
Executive, each party will nominate a qualified medical doctor and the two
doctors will select a third doctor, who will make the determination as to
Disability.  In order to facilitate such determination, the Executive will, as
reasonably requested by the Company, (a) make himself available for medical
examinations by a doctor in accordance with this Section 5.2(ii), and (b) grant
the Company and any such doctor access to all relevant medical information
concerning him, arrange to furnish copies of medical records to such doctor and
use his best efforts to cause his own doctor to be available to discuss his
health with such doctor.

          5.3  Cause.

               (i) The Company may terminate the Executive's employment
hereunder for Cause (as defined below) during the Employment Term by written
notice as provided in Section 12.6. In the event of the Executive's termination
for Cause, the Company will promptly pay to the Executive (or his

                                      -7-
<PAGE>
  
representative) the unpaid Base Salary to which he is entitled, pursuant to
Section 4.1, through the date the Executive is terminated and the Executive will
be entitled to no other compensation or benefits, except as otherwise due to him
under applicable law or pursuant to any benefit plan or policy that is
maintained by the Company or its affiliates in which the Executive participated.

               (ii) For purposes of this Agreement, "Cause" means that, prior to
the end of the Employment Term, (a) the Executive shall have committed or
engaged in:

                    (1) an intentional act of fraud, embezzlement or theft in
          connection with the Executive's duties or in the course of the
          Executive's employment with the Company;

                    (2) an intentional breach of any of the express covenants
          set forth in Section 9.1, 9.2 or 9.3;

                    (3) intentional wrongful damage to property of the Company
          or any Subsidiary; or

                    (4) gross negligence or gross misconduct against the Company
          or another employee, or in carrying out the Executive's duties and
          responsibilities;

and any such act shall have been materially harmful to the Company, (b) the
Executive shall have engaged in intentional and repeated failure substantially
to carry out the Executive's duties and responsibilities (other than any such
failure resulting from the Executive's incapacity due to physical or mental
illness or injury that qualifies as a Disability or would qualify as a
Disability if such incapacity continued for the required length of time), which
failure is not or cannot be cured within five business days after the Company
has given written notice to the Executive specifying in detail the particulars
of the acts of omissions deemed to constitute such failure, or (c) the Executive
shall have been convicted of a felony.  For purposes of this Agreement, no act
or failure to act on the part of the Executive shall be deemed "intentional" if
it was due primarily to an error in judgment or negligence, but shall be deemed
"intentional" only if done or omitted to be done by the Executive not in good
faith and without reasonable belief that the Executive's action or omission was
in the best interest of the Company.  Notwithstanding the foregoing, the
Executive shall not be deemed to have been terminated for "Cause" hereunder
unless and until there shall have been delivered to the Executive a written
notice from the Company stating that it has determined that the Executive had
committed an act constituting "Cause" as herein defined and specifying the
particulars thereof in detail. Nothing herein will limit the right of the
Executive or the Executive's beneficiaries to contest the validity or propriety
of any such determination.

                                      -8-
<PAGE>
  
          5.4  Termination.

               (i) Involuntary Termination. The Executive's employment hereunder
may be terminated during the Employment Term by the Company for any reason other
than death, Disability or for Cause by written notice as provided in Section
12.6. In the event of such an involuntary termination, the Executive will be
entitled to the payments and benefits provided in Section 5.5. This Section
5.4(i) and Section 5.5, however, will not limit the entitlement of the Executive
to any other benefits then available to the Executive under any benefit plan or
policy that is maintained by the Company or its affiliates for the Executive's
benefit or in which the Executive participated. The Executive will be treated
for purposes of this Agreement as having been involuntarily terminated by the
Company for reasons other than death, Disability or for Cause if the Executive
terminates his employment with the Company for any of the following reasons
(each, a "Good Reason") prior to the date of the Executive's death, Disability
or on which the Executive has committed or engaged in an act constituting Cause:
(a) the Company has materially breached any provision of this Agreement and
within 10 calendar days after notice thereof from the Executive, the Company
fails to cure such breach; (b) a successor or assign (whether direct or
indirect, by purchase, merger, consolidation, operation of law or otherwise) to
all or substantially all of the business and/or assets of the Company fails to
assume all duties, obligations and liabilities of the Company under the
Agreement pursuant to Section 12.2(i); (c) a reduction in the scope or value of
the aggregate benefits and incentive compensation described in Sections
4.1(iii), 4.2, 4.3, 4.5 and 4.6 provided to the Executive or the termination or
denial of the Executive's rights to such benefits or incentive compensation, any
of which is not remedied by the Company within 10 calendar days after receipt by
the Company of written notice from the Executive of such reduction or
termination; (d) the Executive is not elected to or is removed from the Board;
(e) the Board fails to appoint the Executive as Chief Executive Officer of the
Company or to elect the Executive as Chairman of the Board, or the Executive is
removed from any such position; (f) the Executive is not elected to or is
removed from any of the Boards of Directors of the Utility Subsidiaries or the
position of Chairman of the Boards of Directors of any of the Utility
Subsidiaries; or (g) a reduction in the Executive's Base Salary or the
opportunity to earn annual incentive compensation under Section 4.1(ii) on a
basis at least as favorable to the Executive (in terms of each of the amount of
benefits, levels of coverage and performance measures and levels of required
performance) as the benefits payable thereunder prior to the reduction or the
failure to pay the Executive Base Salary or incentive compensation earned when
due. Notwithstanding the provisions of clauses (e) or (f) of the preceding
sentence or Section 6.1(a) or (b), any change in the Executive's title or titles
required by law, rule, order or regulation of any agency with competent
jurisdiction shall not be deemed Good Reason for purposes of this Agreement.

                                      -9-
<PAGE>
  
               (ii) Voluntary Termination. The Executive may voluntarily
terminate the Agreement at any time by notice to the Company as provided in
Section 12.6. In the event of the Executive's voluntary termination, the Company
will promptly pay the Executive (a) the unpaid Base Salary to which the
Executive is entitled, pursuant to Section 4.1, through the date of the
Executive's termination, and (b) for any accrued but unused vacation days, to
the extent and in the amounts, if any, provided under the usual policies and
arrangements, as modified by Section 4.3, which cover the Executive. This
Section 5.4(ii) will not limit the entitlement of the Executive to any other
benefits then available to the Executive under any benefit plan or policy that
is maintained by the Company or its affiliates for the Executive's benefit or in
which the Executive participated.

          5.5  Termination Payments and Benefits.

               (i) Form and Amount. Upon the Executive's involuntary termination
other than by reason of death, Disability or for Cause as provided in Section
5.4(i), the Company will promptly pay or provide to the Executive:

                    (a) the unpaid Base Salary to which the Executive is
          entitled, pursuant to Section 4.1, through the date of the Executive's
          termination,

                    (b) for any accrued but unused vacation days, to the extent
          and in the amounts, if any, provided under the usual policies and
          arrangements, as modified by Section 4.3, which cover the Executive,

                    (c) a lump sum payment within five (5) business days after
          termination in an amount equal to three times the sum of (A) the
          annual rate of Base Salary (prior to any deferrals or reductions under
          qualified or non-qualified plans) being paid to the Executive
          immediately prior to termination (or immediately prior to any
          reduction therein occurring prior to termination, if greater), plus
          (B) the aggregate annual bonus, incentive or other payments of cash
          compensation (determined without regard to any deferral election) to
          which the Executive would have been entitled in accordance with
          Section 4.1(ii) under the bonus, incentive, profit-sharing,
          performance, discretionary pay or similar agreement, policy, plan,
          program or arrangement of the Company or its affiliates in which the
          Executive was participating for the year in which the termination
          occurs (or for the year in which any prior reduction therein occurs,
          if greater) based on the assumption that target performance goals for
          such year would be met and such payments would be made, and

                    (d) For a period of 36 months following the termination (the
          "Continuation Period"), the Company

                                     -10-
<PAGE>
  
          will arrange to provide the Executive with health (including
          medical/hospital, dental and vision) and life benefits substantially
          similar to those that the Executive was receiving or entitled to
          receive immediately prior to termination (or, if greater, immediately
          prior to the reduction, termination, or denial described in Section
          5.4(i)(c)).  Benefits otherwise receivable by the Executive pursuant
          to this Section 5.5(i)(d) will be reduced to the extent comparable
          benefits are actually received by or in respect of the Executive from
          another employer during the Continuation Period following the
          Executive's termination, and any such benefits actually received shall
          be reported by the Executive or other recipient to the Company.

               (ii) Maintenance of Benefits.  During the Continuation Period set
forth in Section 5.5(i)(d), the Company will use its best efforts to maintain in
full force and effect for the continued benefit of the Executive all benefits
referenced therein or will arrange to make available to the Executive benefits
substantially similar to the referenced benefits.  Such benefits will be
provided to the Executive on the same terms and conditions (including employee
contributions toward the premium payments) under which the Executive was
entitled to participate immediately prior to the Executive's termination (or, if
more favorable to the Executive, immediately prior to the reduction, termination
or denial described in Section 5.4(i)(c)).  To the extent, however, the coverage
or benefits provided under Section 5.5(i)(d) results in the Executive or any
dependent or beneficiary thereof incurring additional federal, state or local
taxes that would otherwise not have been incurred in connection with the
provision of such coverage or benefits had the Executive's employment not been
terminated, the Company shall promptly pay the Executive, dependent or
beneficiary, as the case may be, on an after-tax basis, an additional payment in
an amount equal to all taxes, including interest and penalties thereon, imposed
as the result of such coverage or benefits.

               (iii) Resignation.  If at the Executive's termination of
employment the Executive is a member of the Board or a board of any affiliate of
the Company, no benefit will be paid or made available under Section 5.5(i)(c)
or Section 5.5(i)(d) unless the Executive first executes and delivers to the
Company a resignation from membership on the Board and from membership on the
boards of all affiliates of the Company, as the case may be, such resignation to
be effective on receipt of the payment to which the Executive is entitled under
Section 5.5(i)(c).

     6.   Change in Control Provisions.

          6.1  Impact of Change in Control.  In the event of a "Change in
Control" of the Company, as defined in Section 6.2,

                                     -11-
<PAGE>
 
(i) if the Executive's employment is involuntarily terminated during the
Employment Term without Cause after the Change in Control, (a) the covenants of
Sections 9.1, 9.3 and 10 will be inapplicable to the Executive, and (b) the
covenant of Section 9.2 will expire on the third anniversary of the date of
termination of the Executive's employment, and (ii) the definition of Good
Reason, as set forth in Section 5.4(i) above, will be expanded to include the
following subject to the last sentence of Section 5.4(i):

               (a) A significant adverse change in the nature or scope of
     authorities, powers, functions, responsibilities or duties attached to the
     positions held by the Executive from those authorities, powers, functions,
     responsibilities or duties which the Executive held immediately prior to
     the Change in Control;

               (b) A determination by the Executive (which determination will be
     conclusive and binding upon the parties hereto provided it has been made in
     good faith and in all events the Executive's determination will be presumed
     to have been made in good faith unless otherwise shown by the Company by
     clear and convincing evidence) that a change in circumstances has occurred
     following the Change in Control, including, without limitation, a change in
     the scope of the business or other activities for which the Executive was
     responsible immediately prior to the Change in Control, which has rendered
     the Executive substantially unable to carry out, has substantially hindered
     the Executive's performance of, or has caused the Executive to suffer a
     substantial reduction in, any of the authorities, powers, functions,
     responsibilities or duties attached to any of the Executive's positions
     immediately prior to such Change in Control, which situation is not
     remedied within 10 calendar days after written notice to the Company from
     the Executive of such determination; or

               (c) The relocation of the Company's principal executive offices
     if the Executive's principal location of work is then in such offices, or
     requirement that the Executive have the Executive's principal location of
     work changed, to any location that is in excess of 50 miles from the
     location thereof immediately preceding the Change in Control or the
     requirement that the Executive travel away from the Executive's office in
     the course of discharging the Executive's responsibilities or duties
     hereunder at least 20% more (in terms of aggregate days in any calendar
     year or in any calendar quarter when annualized for purposes of comparison
     to any prior year) than was required of Executive in any of the three full
     years immediately prior to such Change in Control without, in either case,
     the Executive's prior written consent.

          6.2  Definition of Change in Control.  For purposes of this Agreement,
a "Change in Control" will be deemed to occur if

                                     -12-
<PAGE>
 
at any time during the Employment Term any of the following events occur:

          (i)   The Company is merged, consolidated or reorganized into or
                with another corporation or other legal person, and as a result
                of such merger, consolidation or reorganization less than 65% of
                the combined voting power of the then-outstanding securities or
                interests entitled to vote generally in the election of
                directors or other controlling persons (the "Voting Stock") of
                such corporation or person immediately after such transaction
                are held in the aggregate by the holders of Voting Stock of the
                Company immediately prior to such transaction;
 
          (ii)  The Company sells or otherwise transfers all or substantially 
                all of its assets to another corporation or other legal person,
                and as a result of such sale or transfer less than 65% of the
                combined voting power of the then-outstanding Voting Stock of
                such corporation or person immediately after such sale or
                transfer is held in the aggregate (directly or through ownership
                of Voting Stock of the Company or Subsidiary (as defined
                herein)) by the holders of the Voting Stock of the Company
                immediately prior to such sale or transfer;
 
          (iii) There is a report filed on Schedule 13D or Schedule 14D-1 (or 
                any successor schedule, form or report), each as promulgated
                pursuant to the Securities Exchange Act of 1934, as amended (the
                "Exchange Act"), disclosing that any person (as the term
                "person" is used in Section 13(d)(3) or Section 14(d)(2) of the
                Exchange Act) has become the beneficial owner (as the term
                "beneficial owner" is defined under Rule 13d-3 or any successor
                rule or regulation promulgated under the Exchange Act) of
                securities representing 20% or more of the combined voting power
                of the then-outstanding Voting Stock of the Company;

          (iv)  Any of (A) the Company enters into an agreement, the 
                consummation of which would result in the occurrence of a Change
                in Control determined without regard to this Section 6.2(iv);
                (B) the Company or any person (as the term "person" is used in
                Section 13(d)(3) or Section 14(d)(2) of the Exchange Act)
                announces an intention to take or to consider taking actions
                which, if

                                     -13-
<PAGE>
 
                consummated, would be a Change in Control determined without
                regard to this Section 6.2(iv); or (C) the Board adopts a
                resolution to the effect that a transaction, event or occurrence
                has occurred which constitutes a Change in Control for purposes
                of this Section 6.2(iv);
 
          (v)   If, during any period of two consecutive years, individuals
                who at the beginning of any such period constitute the Directors
                of the Company cease for any reason to constitute at least a
                majority thereof; provided, however, that for purposes of this
                Section 6.2(v) each Director who is first elected, or first
                nominated for election by the Company's stockholders, by a vote
                of at least two-thirds of the Directors of the Company (or a
                committee thereof) then still in office who were Directors of
                the Company at the beginning of any such period will be deemed
                to have been a Director of the Company at the beginning of such
                period; or
 
          (vi)  The approval by the shareholders of the Company of a complete 
                liquidation or dissolution of the Company.
 
Notwithstanding the foregoing provisions of Section 6.2(iii) or 6.2(iv) above,
unless otherwise determined in a specific case by majority vote of the Board, a
"Change in Control" shall not be deemed to have occurred for purposes of Section
6.2(iii) or 6.2(iv) solely because (A) the Company, (B) an entity in which the
Company directly or indirectly beneficially owns 50% or more of the outstanding
Voting Stock (a "Subsidiary"), or (C) any Company-sponsored employee stock
ownership plan or any other employee benefit plan of the Company or any
Subsidiary either files or becomes obligated to file a report or a proxy
statement under or in response to Schedule 13D or Schedule 14D-1(or any
successor schedule, form or report or item therein) under the Exchange Act
disclosing beneficial ownership by it of shares of Voting Stock, whether in
excess of 20% or otherwise, or because a Change in Control (determined without
regard to this sentence) of the Company has occurred or will occur in the future
by reason of such beneficial ownership.  In addition, and notwithstanding
anything to the contrary contained in this Agreement or the foregoing provisions
of this Section 6.2, a "Change in Control" for purposes of this Section 6.2 and
this Agreement shall not be deemed to have resulted from, and shall not be
deemed to have occurred by reason of, entering into the Merger Agreement or the
public announcement thereof or the consummation of the Merger or the other
transactions contemplated by the Merger Agreement.

                                     -14-
<PAGE>
 
     7.   Certain Additional Payments by the Company:

          (i) Anything in this Agreement to the contrary notwithstanding, if it
is determined (as hereafter provided) that any payment or distribution by the
Company, any person whose actions result in a Change in Control or any affiliate
of the Company or such person, to or for the benefit of the Executive, whether
paid or payable or distributed or distributable pursuant to the terms of this
Agreement or otherwise pursuant to or by reason of any other agreement, policy,
plan, program or arrangement, including without limitation any stock option,
stock appreciation right or similar right, or the lapse or termination of any
restriction on or the vesting or exercisability of any of the foregoing (a
"Payment"), would be subject to the excise tax imposed by Section 4999 of the
Code (or any successor provision thereto) by reason of being considered
"contingent on a change in ownership or control" of the Company, within the
meaning of Section 280G of the Code (or any successor provision thereto) or to
any similar tax imposed by state or local law, or any interest or penalties with
respect to such tax (such tax or taxes, together with any such interest and
penalties, are hereafter collectively referred to as the "Excise Tax"), then the
Executive will be entitled to receive an additional payment or payments
(collectively, a "Gross-Up Payment") in an amount such that, after payment by
the Executive of all taxes (including any interest or penalties imposed with
respect to such taxes), including any Excise Tax, imposed upon the Gross-Up
Payment, the Executive retains an amount of the Gross-Up Payment equal to the
Excise Tax imposed upon the Payments.  No Gross-Up Payment will be made with
respect to the Excise Tax, if any, attributable to (a) any incentive stock
option, as defined by Section 422 of the Code ("ISO") granted prior to the
execution of this Agreement (unless a comparable Gross-Up Payment has
theretofore been made available with respect to such option), or (b) any stock
appreciation or similar right, whether or not limited, granted in tandem with
any ISO described in clause (a).

          (ii) Subject to the provisions of Section 7(vi) hereof, all
determinations required to be made under this Section 7, including whether an
Excise Tax is payable by the Executive and the amount of such Excise Tax and
whether a Gross-Up Payment is required to be paid by the Company to the
Executive and the amount of such Gross-Up Payment, will be made by a nationally
recognized firm of certified public accountants (the "Accounting Firm") selected
by the Executive in his sole discretion.  The Executive will direct the
Accounting Firm to submit its determination and detailed supporting calculations
to both the Company and the Executive within 15 calendar days after the
Executive's termination, if applicable, and any other such time or times as may
be requested by the Company or the Executive.  If the Accounting Firm determines
that any Excise Tax is payable by the Executive, the Company will pay the
required Gross-Up Payment to the Executive within five business days after
receipt of such determination and calculations with respect to any Payment to
the Executive.  If the Accounting Firm determines that no Excise Tax

                                     -15-
<PAGE>
 
is payable by the Executive, it will, at the same time as it makes such
determination, furnish the Company and the Executive an opinion that the
Executive has substantial authority not to report any Excise Tax on the
Executive's federal, state, local income or other tax return.  Any determination
by the Accounting Firm as to the amount of the Gross-Up Payment will be binding
upon the Company and the Executive.  As a result of the uncertainty in the
application of Section 4999 of the Code (or any successor provision thereto) and
the possibility of similar uncertainty regarding applicable state or local tax
law at the time of any determination by the Accounting Firm hereunder, it is
possible that Gross-Up Payments that will not have been made by the Company
should have been made (an "Underpayment"), consistent with the calculations
required to be made hereunder.  In the event that the Company exhausts or fails
to pursue its remedies pursuant to Section 7(vi) hereof and the Executive
thereafter is required to make a payment of any Excise Tax, the Executive will
direct the Accounting Firm to determine the amount of the Underpayment that has
occurred and to submit its determination and detailed supporting calculations to
both the Company and the Executive as promptly as possible.  Any such
Underpayment will be promptly paid by the Company to, or for the benefit of, the
Executive within five business days after receipt of such determination and
calculations.

          (iii) The Company and the Executive will each provide the Accounting
Firm access to and copies of any books, records and documents in the possession
of the Company or the Executive, as the case may be, reasonably requested by the
Accounting Firm, and otherwise cooperate with the Accounting Firm in connection
with the preparation and issuance of the determinations and calculations
contemplated by Section 7(ii) hereof.

          (iv) The federal, state and local income or other tax returns filed by
the Executive will be prepared and filed on a consistent basis with the
determination of the Accounting Firm with respect to the Excise Tax payable by
the Executive.  The Executive will make proper payment of the amount of any
Excise Tax, and at the request of the Company, provide to the Company true and
correct copies (with any amendments) of the Executive's federal income tax
return as filed with the Internal Revenue Service and corresponding state and
local tax returns, if relevant, as filed with the applicable taxing authority,
and such other documents reasonably requested by the Company, evidencing such
payment.  If prior to the filing of the Executive's federal income tax return,
or corresponding state or local tax return, if relevant, the Accounting Firm
determines that the amount of the Gross-Up Payment should be reduced, the
Executive will within five business days pay to the Company the amount of such
reduction.

          (v) The fees and expenses of the Accounting Firm for its services in
connection with the determinations and calculations contemplated by Sections
7(ii) and (iv) hereof will

                                     -16-
<PAGE>
 
be borne by the Company.  If such fees and expenses are initially paid by the
Executive, the Company will reimburse the Executive the full amount of such fees
and expenses within five business days after receipt from the Executive of a
statement therefor and reasonable evidence of his payment thereof.

          (vi) The Executive will notify the Company in writing of any claim by
the Internal Revenue Service or other taxing authority that, if successful,
would require the payment by the Company of a Gross-Up Payment.  Such
notification will be given as promptly as practicable but no later than 10
business days after the Executive actually receives notice of such claim and the
Executive will further apprise the Company of the nature of such claim and the
date on which such claim is requested to be paid (in each case, to the extent
known by the Executive).  The Executive will not pay such claim prior to the
earlier of (a) the expiration of the 30-calendar-day period following the date
on which the Executive gives such notice to the Company and (b) the date that
any payment of amount with respect to such claim is due.  If the Company
notifies the Executive in writing prior to the expiration of such period that it
desires to contest such claim, the Executive will:

               (a) provide the Company with any written records or documents in
          the Executive's possession relating to such claim reasonably requested
          by the Company;

               (b) take such action in connection with contesting such claim as
          the Company will reasonably request in writing from time to time,
          including without limitation accepting legal representation with
          respect to such claim by an attorney competent in respect of the
          subject matter and reasonably selected by the Company;

               (c) cooperate with the Company in good faith in order effectively
          to contest such claim; and

               (d) permit the Company to participate in any proceedings relating
          to such claim;

provided, however, that the Company will bear and pay directly all costs and
expenses (including interest and penalties) incurred in connection with such
contest and will indemnify and hold harmless the Executive, on an after-tax
basis, for and against any Excise Tax or income tax, including interest and
penalties with respect thereto, imposed as a result of such representation and
payment of costs and expenses.  Without limiting the foregoing provisions of
this Section 7(vi), the Company will control all proceedings taken in connection
with the contest of any claim contemplated by this Section 7(vi) and, at its
sole option, may pursue or forego any and all administrative appeals,
proceedings, hearings and conferences with the taxing authority in respect of
such claim (provided, however, that the Executive may participate therein at the
Executive's own cost and expense) and may, at its option, either direct the
Executive to

                                     -17-
<PAGE>
 
pay the tax claimed and sue for a refund or contest the claim in any permissible
manner, and the Executive agrees to prosecute such contest to a determination
before any administrative tribunal, in a court of initial jurisdiction and in
one or more appellate courts, as the Company will determine; provided, however,
that if the Company directs the Executive to pay the tax claimed and sue for a
refund, the Company will advance the amount of such payment to the Executive on
an interest-free basis and will indemnify and hold the Executive harmless, on an
after-tax basis, from any Excise Tax or income or other tax, including interest
or penalties with respect thereto, imposed with respect to such advance; and
provided further, however, that any extension of the statute of limitations
relating to payment of taxes for the taxable year of the Executive with respect
to which the contested amount is claimed to be due is limited solely to such
contested amount.  Furthermore, the Company's control of any such contested
claim will be limited to issues with respect to which a Gross-Up Payment would
be payable hereunder and the Executive will be entitled to settle or contest, as
the case may be, any other issue raised by the Internal Revenue Service or any
other taxing authority.

          (vii) If, after the receipt by the Executive of an amount advanced by
the Company pursuant to Section 7(vi) hereof, the Executive receives any refund
with respect to such claim, the Executive will (subject to the Company's
complying with the requirements of Section 7(vi) hereof) promptly pay to the
Company the amount of such refund (together with any interest paid or credited
thereon after any taxes applicable thereto).  If, after the receipt by the
Executive of an amount advanced by the Company pursuant to Section 7(vi) hereof,
a determination is made that the Executive will not be entitled to any refund
with respect to such claim and the Company does not notify the Executive in
writing of its intent to contest such denial or refund prior to the expiration
of 30 calendar days after such determination, then such advance will be forgiven
and will not be required to be repaid and the amount of such advance will
offset, to the extent thereof, the amount of Gross-Up Payment required to be
paid by the Company to the Executive pursuant to this Section 7.

     8.   Mitigation and Offset.  The payment of severance compensation by the
Company to the Executive in accordance with the terms of the Agreement is hereby
acknowledged by the Company to be reasonable, and the Executive is under no
obligation to mitigate damages or the amount of any payment provided for
hereunder by seeking other employment or otherwise; nor will any profits,
income, earnings or other benefits from any source whatsoever create any
mitigation, offset, reduction or any other obligation on the part of the
Executive hereunder or otherwise, except as expressly provided in the last
sentence of Section 5.5(i)(d).

                                     -18-
<PAGE>
 
     9.   Competition; Confidentiality; Nonsolicitation

          9.1  (i) Subject to Section 6.1(i), the Executive hereby covenants and
agrees that during the Employment Term and for one year following the Employment
Term he will not, without the prior written consent of the Company, engage in
Competition (as defined below) with the Company. For purposes of this Agreement,
if the Executive takes any of the following actions he will be engaged in
"Competition": engaging in or carrying on, directly or indirectly, any
enterprise, whether as an advisor, principal, agent, partner, officer, director,
employee, stockholder, associate or consultant to any person, partnership,
corporation or any other business entity, that is principally engaged in the
business of the generation, purchase, transmission, distribution or sale of
electricity, the provision of natural gas or the supplying of water services, in
each case to customer segments being served or pursued in its business plans by
the Company or its Subsidiaries, in States in which the Company or its
Subsidiaries has significant operations; provided, however, that "Competition"
will not include (a) the mere ownership of securities in any enterprise and
exercise of rights appurtenant thereto or (b) participation in management of any
enterprise or business operation thereof other than in connection with the
competitive operation of such enterprise. For purposes of applying the preceding
sentence, operations of the Company or its Subsidiaries in the State of
California will be deemed not to be significant if they are not materially
greater than the operations in the aggregate of Nevada Power and the Company and
their respective Subsidiaries in the State of California as of the date of this
Agreement.

               (ii) Subject to Section 6.1(i), the Executive hereby covenants
and agrees that during the Employment Term and for three years following the
Employment Term he will not assist a third party in preparing or making an
unsolicited bid for the Company, engaging in a proxy contest with the Company,
or engaging in any other similar activity.

          9.2  During the Employment Term, the Company agrees that it will 
disclose to Executive its confidential or proprietary information (as defined in
this Section 9.2) to the extent necessary for Executive to carry out the
Executive's obligations under this Agreement. Subject to Section 6.1(i), the
Executive hereby covenants and agrees that he will not, without the prior
written consent of the Company, during the Employment Term or thereafter
disclose to any person not employed by the Company or a Subsidiary, or use in
connection with engaging in Competition with the Company or a Subsidiary, any
confidential or proprietary information of the Company or its Subsidiaries. For
purposes of this Agreement, the term "confidential or proprietary information"
will include all information of any nature and in any form that is owned by the
Company or a Subsidiary and that is not publicly available or generally known to
persons engaged in businesses similar or related to those of the Company or a
Subsidiary. Confidential information will include, without

                                     -19-
<PAGE>
 
limitation, the Company's or a Subsidiary's financial matters, customers,
employees, industry contracts, and all other secrets and all other information
of a confidential or proprietary nature.  The foregoing obligations imposed by
this Section 9.2 will cease if such confidential or proprietary information will
have become, through no fault of the Executive, generally known to the public or
the Executive is required by law to make disclosure (after giving the Company
notice and an opportunity to contest such requirement).

          9.3  Subject to Section 6.1(i), the Executive hereby covenants and 
agrees that during the Employment Term and for one year thereafter the Executive
will not attempt to influence, persuade or induce, or assist any other person in
so persuading or inducing, any employee of the Company or a Subsidiary to give
up, or to not commence, employment or a business relationship with the Company
or a Subsidiary.

     10.  Post-termination Assistance.  Subject to Section 6.1(i), the
Executive agrees that after the Executive's employment with the Company has
terminated the Executive will provide, upon reasonable notice, such information
and assistance to the Company as may reasonably be requested by the Company in
connection with any litigation in which it or any of its affiliates is or may
become a party; provided, however, that the Company agrees to reimburse the
Executive for any related out-of-pocket expenses, including travel expenses.

     11.  Survival.  The expiration or termination of the Employment Term will
not impair the rights or obligations of any party hereto that accrue hereunder
prior to such expiration or termination, except to the extent specifically
stated herein.  In addition to the foregoing, the Executive's covenants
contained in Sections 9.1, 9.2, 9.3 and 10 and the Company's obligations under
Sections 5, 7 and 12.1 will survive the expiration or termination of this
Agreement or the termination of the Executive's employment for any reason
whatsoever.

     12.  Miscellaneous Provisions.

          12.1  Legal Fees and Expenses. It is the intent of the Company that 
the Executive not be required to incur legal fees and the related expenses
associated with the interpretation, enforcement or defense of Executive's rights
under this Agreement by litigation or otherwise because the cost and expense
thereof would substantially detract from the benefits intended to be extended to
the Executive hereunder.  Accordingly, if it should appear to the Executive that
the Company has failed to comply with any of its obligations under this
Agreement or in the event that the Company or any other person takes or
threatens to take any action to declare this Agreement void or unenforceable, or
institutes any litigation or other action or proceeding designed to deny, or to
recover from, the Executive the benefits provided or intended to be provided to
the Executive hereunder, the Company irrevocably authorizes the Executive from
time to time to

                                     -20-
<PAGE>
 
retain counsel of Executive's choice, at the expense of the Company as hereafter
provided, to advise and represent the Executive in connection with any such
interpretation, enforcement or defense, including without limitation the
initiation or defense of any litigation or other legal action, whether by or
against the Company or any director, officer, stockholder or other person
affiliated with the Company, in any jurisdiction. Notwithstanding any existing
or prior attorney-client relationship between the Company and such counsel, the
Company irrevocably consents to the Executive's entering into an attorney-client
relationship with such counsel, and in that connection the Company and the
Executive agree that a confidential relationship shall exist between the
Executive and such counsel.  Without respect to whether the Executive prevails,
in whole or in part, in connection with any of the foregoing, the Company will
pay and be solely financially responsible for any and all attorneys' and related
fees and expenses incurred by the Executive in connection with any of the
foregoing.

          12.2  Successors and Binding Agreement.  (i) The Company will require 
any successor (whether direct or indirect, by purchase, merger, consolidation,
reorganization, operation of law or otherwise) to all or substantially all of
the business or assets of the Company, by agreement in form and substance
satisfactory to the Executive, expressly to assume and agree to perform this
Agreement in the same manner and to the same extent the Company would be
required to perform if no such succession had taken place. This Agreement will
be binding upon and inure to the benefit of the Company and any successor to the
Company, including without limitation any persons acquiring directly or
indirectly all or substantially all of the business or assets of the Company
whether by purchase, merger, consolidation, reorganization, operation of law or
otherwise (and such successor shall thereafter be deemed the "Company" for the
purposes of this Agreement), but will not otherwise be assignable, transferable
or delegable by the Company.

          (ii) This Agreement will inure to the benefit of and be enforceable by
the Executive's personal or legal representatives, executors, administrators,
successors, heirs, distributees and legatees.

          (iii) This Agreement is personal in nature and neither of the parties
hereto shall, without the consent of the other, assign, transfer or delegate
this Agreement or any rights or obligations hereunder except as expressly
provided in Sections 12.2(i) and 12.2(ii).  Without limiting the generality or
effect of the foregoing, the Executive's right to receive payments hereunder
will not be assignable, transferable or delegable, whether by pledge, creation
of a security interest, or otherwise, other than by a transfer by Executive's
will or by the laws of descent and distribution and, in the event of any
attempted assignment or transfer contrary to this Section 12.2(iii), the Company
shall have no liability to pay any amount so attempted to be assigned,
transferred or delegated.

                                     -21-
<PAGE>
 
          12.3  Governing Law.  This Agreement will be governed, construed,
interpreted and enforced in accordance with the substantive laws of the State of
Nevada, without regard to conflicts of law principles.

          12.4  Withholding of Taxes.  The Company may withhold from any amounts
payable under this Agreement all federal, state, city or other taxes as the
Company is required to withhold pursuant to any law or government regulation or
ruling.

          12.5  Severability.  Any provision of this Agreement that is deemed
invalid, illegal or unenforceable in any jurisdiction will, as to that
jurisdiction be ineffective to the extent of such invalidity, illegality or
unenforceability, without affecting in any way the remaining provisions hereof
in such jurisdiction or rendering that or any other provisions of this Agreement
invalid, illegal, or unenforceable in any other jurisdiction.  If any covenant
should be deemed invalid, illegal or unenforceable because its scope is
considered excessive, such covenant will be modified so that the scope of the
covenant is reduced only to the minimum extent necessary to render the modified
covenant valid, legal and enforceable.

          12.6  Notices.  For all purposes of this Agreement, all 
communications, including without limitation notices, consents, requests or
approvals, required or permitted to be given hereunder will be in writing and
will be deemed to have been duly given when hand delivered or dispatched by
electronic facsimile transmission (with receipt thereof confirmed), or five
business days after having been mailed by United States registered or certified
mail, return receipt requested, postage prepaid, or three business days after
having been sent by a nationally recognized overnight courier service such as
Federal Express, UPS, or Purolator, addressed to the Company (to the attention
of the Secretary of the Company) at its principal executive offices and to the
Executive at his principal residence, or to such other address as any party may
have furnished to the other in writing and in accordance herewith, except that
notices of changes of address will be effective only upon receipt.

               (i) To The Company.  If to the Company, addressed to the
attention of the Secretary at 6100 Neil Road, Reno, Nevada 89511.

               (ii) To the Executive.  If to the Executive, to him at _________.

          12.7  Counterparts.  This Agreement may be executed in several
counterparts, each of which will be deemed to be an original, but all of which
together will constitute one and the same Agreement.

          12.8  Effectiveness; Prior Agreement; Entire Agreement. This Agreement
shall become effective at the Effective Time and shall have no force or effect
prior thereto.  At the Effective

                                     -22-
<PAGE>
 
Time, the terms of this Agreement are intended by the parties to be the final
expression of their agreement with respect to the Executive's employment by the
Company, may not be contradicted by evidence of any prior or contemporaneous
agreement, and shall supersede in all respects any prior or other agreement or
understanding between the Company, any Subsidiary or Nevada Power and the
Executive, including, but not limited to, the Employment Agreement dated as of
February 2, 1998 (the "Prior Agreement") between Nevada Power and the Executive,
which Prior Agreement will terminate and be without further effect immediately
prior to the Effective Time (and upon the effectiveness of this Agreement)
without further action of Nevada Power, Surviving Company or the Executive or
liability to Nevada Power or Surviving Company or the Executive thereunder.  The
parties further intend that this Agreement will constitute the complete and
exclusive statement of its terms and that no extrinsic evidence whatsoever may
be introduced in any judicial, administrative or other legal proceeding to vary
the terms of this Agreement.  In the event that (i) the Merger Agreement is
terminated for any reason prior to the Effective Time or (ii) the Executive's
employment with Nevada Power is terminated prior to the Effective Time, this
Agreement shall be null and void, and the Prior Agreement will continue in
effect as though this Agreement had not been entered into.

          12.9  Amendments; Waivers.  This Agreement may not be modified,
amended, or terminated except by an instrument in writing, signed by the
Executive and the Company. Failure on the part of either party to complain of
any action or omission, breach or default on the part of the other party, no
matter how long the same may continue, will never be deemed to be a waiver of
any rights or remedies hereunder, at law or in equity.  The Executive or the
Company may waive compliance by the other party with any provision of this
Agreement that such other party was or is obligated to comply with or perform
only through an executed writing; provided, however, that such waiver will not
operate as a waiver of, or estoppel with respect to, any other or subsequent
failure.

          12.10  No Inconsistent Actions.  The parties will not voluntarily
undertake or fail to undertake any action or course of action that is
inconsistent with the provisions or essential intent of this Agreement.
Furthermore, it is the intent of the parties hereto to act in a fair and
reasonable manner with respect to the interpretation and application of the
provisions of this Agreement.

          12.11  Headings and Section References.  The headings used in this
Agreement are intended for convenience or reference only and will not in any
manner amplify, limit, modify or otherwise be used in the construction or
interpretation of any provision of this Agreement.  All section references are
to sections of this Agreement, unless otherwise noted.

                                     -23-
<PAGE>
 
          12.12  Interest.  Without limiting the rights of the Executive at law
or in equity, if the Company fails to make any payment or provide any benefit
required to be made or provided hereunder on a timely basis, the Company will
pay interest on the amount or value thereof at an annualized rate of interest
equal to the so-called composite "prime rate" as quoted from time to time during
the relevant period in the Northeast Edition of The Wall Street Journal.  Such
interest will be payable as it accrues on demand.  Any change in such prime rate
will be effective on and as of the date of such change.

          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date and year first above written, but effective as provided in Section 1.2.



                              _________________________________________
                              Michael R. Niggli



                              Sierra Pacific Resources,
                              a Nevada corporation



                              By: _____________________________________
                              Name: ___________________________________
                              Title: __________________________________
 
                                     -24-
<PAGE>

                                                                Merger Agreement
                                                                Exhibit 7.15.2



                              EMPLOYMENT AGREEMENT



          This EMPLOYMENT AGREEMENT (the "Agreement"), dated as of ________,
1998, but effective as provided herein, is made and entered into by and between
Sierra Pacific Resources, a Nevada corporation (the "Company"), and Malyn K.
Malquist (the "Executive").

          WHEREAS, the Executive has been serving as the Chairman of the Board,
President and Chief Executive Officer of the Company;

          WHEREAS, the Company and Nevada Power Company, a Nevada corporation
("Nevada Power"), have executed a merger agreement (the "Merger Agreement")
which contemplates the merger (the "Merger") of Nevada Power with and into a
subsidiary ("Desert Sub") of the Company, with Desert Sub (to be renamed Nevada
Power Company) as the survivor (the "Surviving Company") and certain other
transactions, all of which will become effective at the Effective Time (as
defined in the Merger Agreement);

          WHEREAS, in order to induce Executive to serve, on and after the
Effective Time, as the President and Chief Operating Officer of the Company and
as President and Chief Executive Officer of each of Sierra Pacific Power Company
and Surviving Company (collectively, the "Utility Subsidiaries"), the Company
desires to provide Executive with compensation and other benefits on the terms
and conditions set forth in this Agreement;

          WHEREAS, the Company considers it in the best interests of its
stockholders to foster the continuous employment of certain key management
personnel;

          WHEREAS, the Company recognizes that, as is the case for most publicly
held companies, the possibility of a Change in Control (as defined herein)
exists;

          WHEREAS, the Company wishes to assure itself of continuation of
management following the Effective Time, including in the event of a Change in
Control; and

          WHEREAS, the Company wishes to employ the Executive and the Executive
is willing to render services, both on the terms and subject to the conditions
set forth in this Agreement;
<PAGE>
 
          NOW, THEREFORE, in consideration of the promises and of the mutual
covenants herein contained, it is agreed as follows:
 
1.   Employment.

          1.1  The Company hereby agrees to employ the Executive, and the
Executive hereby agrees to undertake employment with the Company, upon the terms
and conditions herein set forth.

          1.2  Employment will be for a term commencing on the Effective Time
(the "Effective Date") and, subject to earlier expiration upon the Executive's
termination under Section 5, expiring on the third anniversary of the Effective
Time (the "Employment Term").  The Employment Term may be extended by mutual
written agreement of the parties.  In the event a Change in Control (as defined
in Section 6.2) occurs less than three years before the end of the Employment
Term, the Employment Term will be extended for a period ending on the third
anniversary of the occurrence of the Change in Control, except that in the event
the occurrence of a Change in Control as described in Section 6.2(iv) occurs
less than three years before the end of the Employment Term, the Employment Term
will be extended for a period ending on the later of (i) the third anniversary
of the occurrence of such Change in Control or (ii) the earlier of (a) the day
after any transaction, occurrence or event described in any agreement,
announcement or resolution referred to in Section 6.2(iv) (a "Transaction") is
consummated or (b) the date it is determined by resolution of the Board of
Directors of the Company (the "Board") adopted in good faith that such
Transaction will not be consummated.  (The Employment Term, as so extended under
this Section 1.2, will thereafter constitute the "Employment Term" hereunder and
is subject to further extension as provided in this Section 1.2.)

     2.   Positions and Duties.

          2.1  Positions and Duties.  During the Employment Term, the Executive
will serve in the position of President and Chief Operating Officer of the
Company and as President and Chief Executive Officer of each of the Utility
Subsidiaries and will have such powers, duties, functions, responsibilities and
authority as are (i) consistent with the Executive's positions; or (ii) assigned
to his office in the Company's and Utility Subsidiaries' bylaws; or (iii)
reasonably assigned to him by the Chief Executive Officer of the Company.  The
Executive will report directly to the Chief Executive Officer of the Company. In
addition the Company will use its best efforts to cause the Executive to be
elected as a member of the Board throughout the Employment Term and will use its
best efforts to cause him to be included in the management slate for election as
a director at every stockholders' meeting at which his term as a director would
otherwise expire.  During the Employment Term, the Company will not appoint a
Vice Chairman of the Company.

                                       2
<PAGE>
 
          2.2  Commitment.  During the Employment Term, the Executive will be
the Company's full-time employee and, except as may otherwise be approved in
advance in writing by the Chief Executive Officer of the Company, and except
during vacation periods and reasonable periods of absence due to sickness,
personal injury or other disability, the Executive will devote substantially all
of his business time and attention to the performance of his duties hereunder.
Notwithstanding the foregoing, the Executive may, (i) subject to the approval of
the Board, serve as a director of a company which is not engaged in
"Competition" (as defined in Section 9.1) with the Company or any Subsidiary (as
defined in Section 6.2), (ii) serve as an officer, director or otherwise
participate in purely educational, welfare, social, religious and civic
organizations, and (iii) manage personal and family investments.

     3.   Place of Performance.  In connection with his employment during the
Employment Term, unless otherwise agreed by the Executive, the Executive will
have offices at each of the Company's and Surviving Company's principal
executive offices. The Executive will undertake normal business travel on behalf
of the Company.

     4.   Compensation and Related Matters.

          4.1  Compensation.

          (i) Annual Base Salary.  During the Employment Term, the Company will
pay to the Executive an annual base salary ("Base Salary") in such amount as
shall be commensurate with his position and level of responsibility as
determined by the Board (or the Compensation Committee thereof) in its sole
discretion from time to time; provided, however, that in no event shall such
Base Salary be less than the Executive's annual base salary at the Company as
in effect immediately prior to the Effective Time.  Base salary shall be payable
at the times and in the manner consistent with the Company's general policies
regarding compensation of executive employees.  Base Salary may not be
decreased.  The Board may from time to time authorize such additional
compensation to the Executive, in cash or in property, as the Board may
determine in its sole discretion to be appropriate.

          (ii) Annual Incentive Compensation.  If the Board (or the Compensation
Committee thereof) authorizes any annual cash incentive compensation or approves
any other annual management incentive program or arrangement, the Executive will
be eligible to participate in such plan, program or arrangement under the
general terms and conditions applicable to executive and management employees.
The Executive's target payout under such annual incentive compensation plans,
programs and arrangements will be, subject to achievement of applicable
performance measures, on an annual level of not less than a percentage of Base
Salary equal to the target percentage of annual base salary in effect for the
Executive under the

                                       3
<PAGE>
 
Company's annual incentive compensation plan immediately prior to the Effective
Time; provided, however, that such percentage shall in no event be less than the
target payout percentage applicable for the year to the Chairman of the Board
and Chief Executive Officer of the Company.  Subject to the foregoing, nothing
in this Section 4.1(ii) will guarantee to the Executive any specific amount of
incentive compensation, or prevent the Board (or the Compensation Committee
thereof) from establishing performance goals and compensation targets applicable
only to the Executive.

          (iii) Long-Term Incentive Compensation Plans and Programs. If the
Board (or the Compensation Committee thereof) authorizes any long-term cash
incentive plan or program, the Executive will be eligible to participate in such
plan or program under the general terms and conditions applicable to executive
and management employees. The Executive's participation in any such plan or
program will be, subject to achievement of applicable performance measures, at
annual target level grant of not less than a percentage of Base Salary equal to
the most recent percentage of annual base salary granted to the Executive prior
to the Effective Time as a target level grant under the Company's cash long-term
incentive plan; provided, however, that such percentage shall in no event be
less than the target level grant percentage applicable for the year to the
Chairman of the Board and Chief Executive Officer of the Company. Subject to the
foregoing, nothing in this Section 4.1(iii) will guarantee the Executive any
specific amount of long-term incentive compensation, or prevent the Board (or
the Compensation Committee thereof) from establishing performance goals and
compensation targets applicable only to the Executive.

          4.2  Employee and Executive Benefits.  In addition to the
compensation described in Section 4.1 and subject to the following provisions of
this Section 4, the Company will make or cause to be made available to the
Executive and his eligible dependents, subject to the terms and conditions of
the applicable plans, including without limitation the eligibility rules,
participation in all employee benefit plans, including all employee retirement
income and welfare benefit policies, plans, programs or arrangements, in which
senior executives of the Company participate from time to time, including any
stock option, stock purchase, stock appreciation, savings, pension, supplemental
executive retirement or other retirement income or welfare benefit, disability,
salary continuation, and any other deferred compensation, incentive
compensation, group and/or executive life, health, medical/hospital or other
insurance (whether funded by actual insurance or self-insured by the Company or
an affiliate), expense reimbursement or other employee benefit policies, plans,
programs or arrangements.

          4.3  Vacation and Fringe Benefits.  During the Employment Term, the 
Executive shall be entitled to vacation in such amounts as determined under
and to be taken in accordance with the Company's normal vacation policies
applicable to senior executives, and the Executive shall be entitled to the

                                       4
<PAGE>
 
perquisites and other fringe benefits made available to senior executives of the
Company, commensurate with his position and level of responsibility with the
Company.

          4.4  Expenses.  The Company will promptly reimburse the Executive for 
all travel and other business expenses the Executive incurs in order to perform
his duties to the Company under this Agreement in a manner commensurate with the
Executive's position and level of responsibility with the Company, and in
accordance with the Company's policy regarding substantiation of expenses.

          4.5  Relocation Expenses.  If the Company requests that the Executive 
relocate after the Effective Date to the general area of the Nevada Power's
current headquarters in Las Vegas, Nevada, the Company will pay the Executive
and, where applicable, upon substantiation of expenses (i) at the time of
relocation a relocation allowance equal to 1/24th of the Executive's Base Salary
at the time of relocation, (ii) an allowance for up to two months' rent for
temporary housing following relocation at a rate of not more than $2,000 per
month, (iii) any additional expenses incurred by the Executive associated with
up to two house hunting trips to the Las Vegas, Nevada area for the Executive
and his wife, (iv) relocation expenses associated with moving the Executive's
family and household goods from Reno, Nevada to the Las Vegas, Nevada area, and
(v) the normal seller's broker's commission associated with the sale of the
Executive's existing residence in Reno, Nevada. In lieu of the payment provided
for in clause (v), the Executive may elect to have the Company purchase the
Executive's existing home in Reno, Nevada at a price equal to the average of the
fair market values as reported in two appraisals submitted by appraisers jointly
agreed to by the Executive and the Company.

          4.6  Supplemental Retirement Benefits.  The Executive will be
eligible for a benefit under a supplemental retirement plan established by the
Company for the Executive.  The benefit, if any, to which the Executive is
entitled under such supplemental retirement plan will be payable at the same
time and in the same form as the benefit to which the Executive would be
entitled under the Company's Retirement Plan (the "Qualified Plan") if he were a
participant therein and will be equal to:

          (a) the benefit to which the Executive would be entitled under the
     Qualified Plan (after application of the limitations included therein that
     are imposed by the Code, such as Code Sections 401(a)(17) and 415)
     determined as if the Executive (I) were a participant in the Qualified
     Plan, (II) had an additional twenty (20) years of benefit accrual service
     under the Qualified Plan, and (III) had an additional twenty (20) years of
     vesting service under the Qualified Plan, less

          (b) the sum of (I) the actual amount, if any, payable to or on behalf
     of the Executive under the Qualified Plan

                                       5
<PAGE>
 
     and (II) the actuarial equivalent amounts, if any, of the vested retirement
     benefits to which the Executive is entitled under any qualified or non-
     qualified defined benefit plan in which the Executive participated prior to
     his employment with the Company and its affiliates (such amounts under
     clauses (a) and (b) to be determined without regard to any assignment of
     benefits under a qualified domestic relations order, and the actuarial
     equivalents under clause (b)(II) to be determined using the applicable
     actuarial assumptions as specified in the Qualified Plan).

     5.   Termination.  Notwithstanding the Employment Term specified in Section
1.2, the termination of the Executive's employment hereunder will be governed by
the following provisions:

          5.1  Death.  In the event of the termination of the Executive's
employment during the Employment Term by reason of the Executive's death, the
Company will pay to the Executive's beneficiaries or estate, as appropriate,
promptly after the Executive's death, (i) the unpaid Base Salary to which the
Executive is entitled, pursuant to Section 4.1, through the date of the
Executive's death, and (ii) for any accrued but unused vacation days, to the
extent and in the amounts, if any, provided under the usual policies and
arrangements which cover the Executive.  This Section 5.1 will not limit the
entitlement of the Executive's estate or beneficiaries to any death or other
benefits then available to the Executive under any life insurance, stock
ownership, stock options, or other benefit plan or policy that is maintained by
the Company or its affiliates for the Executive's benefit or in which the
Executive participated.

          5.2  Disability.

               (i) If the Executive has incurred a Disability (as defined below)
during the Employment Term, the Company may give the Executive written notice of
its intention to terminate the Executive's employment.  In such event, the
Executive's employment with the Company will terminate effective on the 30th
calendar day after receipt of such notice by the Executive, provided that within
the 30 calendar days after such receipt, the Executive will not have returned to
full-time performance of his duties.  The Executive will continue to receive his
Base Salary (less any amounts payable to the Executive for such period under any
short- or long-term disability plan maintained by the Company or an affiliate)
and benefits until the date of termination.  In the event of the Executive's
Disability, the Company will pay the Executive, promptly after the Executive's
termination, (a) the unpaid Base Salary to which he is entitled, pursuant to
Section 4.1, through the date of the Executive's termination (less any amounts
payable to the Executive for such period under any short-or long-term disability
plan maintained by the Company or an affiliate), and (b) for any accrued but
unused vacation days, to the extent and in the amounts, if any, provided under
the usual policies and arrangements which cover the Executive.  This

                                       6
<PAGE>
 
Section 5.2 will not limit the entitlement of the Executive or the Executive's
estate or beneficiaries to any disability or other benefits then available to
the Executive under any disability insurance or other benefit plan or policy
that is maintained by the Company or its affiliates for the Executive's benefit
or in which the Executive participated.

               (ii) For purposes of this Agreement, "Disability" will mean the
Executive's incapacity due to physical or mental illness or injury substantially
to perform his duties on a full-time basis for six consecutive months and within
30 calendar days after a notice of termination is thereafter given by the
Company the Executive will not have returned to the full-time performance of the
Executive's duties; provided, however, if the Executive disagrees with a
determination to terminate him because of Disability, the question of the
Executive's Disability will be subject to the certification of a qualified
medical doctor agreed to by the Company and the Executive or, in the event of
the Executive's incapacity to designate a doctor, the Executive's legal
representative.  In the absence of agreement between the Company and the
Executive, each party will nominate a qualified medical doctor and the two
doctors will select a third doctor, who will make the determination as to
Disability.  In order to facilitate such determination, the Executive will, as
reasonably requested by the Company, (a) make himself available for medical
examinations by a doctor in accordance with this Section 5.2(ii), and (b) grant
the Company and any such doctor access to all relevant medical information
concerning him, arrange to furnish copies of medical records to such doctor and
use his best efforts to cause his own doctor to be available to discuss his
health with such doctor.

          5.3  Cause.

               (i) The Company may terminate the Executive's employment
hereunder for Cause (as defined below) during the Employment Term by written
notice as provided in Section 12.6. In the event of the Executive's termination
for Cause, the Company will promptly pay to the Executive (or his
representative) the unpaid Base Salary to which he is entitled, pursuant to
Section 4.1, through the date the Executive is terminated and the Executive will
be entitled to no other compensation or benefits, except as otherwise due to him
under applicable law or pursuant to any benefit plan or policy that is
maintained by the Company or its affiliates in which the Executive participated.

               (ii) For purposes of this Agreement, "Cause" means that, prior to
the end of the Employment Term, (a) the Executive shall have committed or
engaged in:

                    (1) an intentional act of fraud, embezzlement or theft in
          connection with the Executive's duties or in the course of the
          Executive's employment with the Company;

                                       7
<PAGE>
 
                    (2) an intentional breach of any of the express covenants
          set forth in Section 9.1, 9.2 or 9.3;

                    (3) intentional wrongful damage to property of the Company
          or any Subsidiary; or

                    (4) gross negligence or gross misconduct against the Company
          or another employee, or in carrying out the Executive's duties and
          responsibilities;

and any such act shall have been materially harmful to the Company, (b) the
Executive shall have engaged in intentional and repeated failure substantially
to carry out the Executive's duties and responsibilities (other than any such
failure resulting from the Executive's incapacity due to physical or mental
illness or injury that qualifies as a Disability or would qualify as a
Disability if such incapacity continued for the required length of time), which
failure is not or cannot be cured within five business days after the Company
has given written notice to the Executive specifying in detail the particulars
of the acts of omissions deemed to constitute such failure, or (c) the Executive
shall have been convicted of a felony.  For purposes of this Agreement, no act
or failure to act on the part of the Executive shall be deemed "intentional" if
it was due primarily to an error in judgment or negligence, but shall be deemed
"intentional" only if done or omitted to be done by the Executive not in good
faith and without reasonable belief that the Executive's action or omission was
in the best interest of the Company.  Notwithstanding the foregoing, the
Executive shall not be deemed to have been terminated for "Cause" hereunder
unless and until there shall have been delivered to the Executive a written
notice from the Company stating that it has determined that the Executive had
committed an act constituting "Cause" as herein defined and specifying the
particulars thereof in detail. Nothing herein will limit the right of the
Executive or the Executive's beneficiaries to contest the validity or propriety
of any such determination.

          5.4  Termination.

               (i) Involuntary Termination. The Executive's employment hereunder
may be terminated during the Employment Term by the Company for any reason other
than death, Disability or for Cause by written notice as provided in Section
12.6. In the event of such an involuntary termination, the Executive will be
entitled to the payments and benefits provided in Section 5.5. This Section
5.4(i) and Section 5.5, however, will not limit the entitlement of the Executive
to any other benefits then available to the Executive under any benefit plan or
policy that is maintained by the Company or its affiliates for the Executive's
benefit or in which the Executive participated. The Executive will be treated
for purposes of this Agreement as having been involuntarily terminated by the
Company for reasons other than death, Disability or for Cause if the Executive
terminates his employment with the Company for any of the following reasons

                                       8
<PAGE>
 
(each, a "Good Reason") prior to the date of the Executive's death, Disability
or on which the Executive has committed or engaged in an act constituting Cause:
(a) the Company has materially breached any provision of this Agreement and
within 10 calendar days after notice thereof from the Executive, the Company
fails to cure such breach; (b) a successor or assign (whether direct or
indirect, by purchase, merger, consolidation, operation of law or otherwise) to
all or substantially all of the business and/or assets of the Company fails to
assume all duties, obligations and liabilities of the Company under the
Agreement pursuant to Section 12.2(i); (c) a reduction in the scope or value of
the aggregate benefits and incentive compensation described in Sections
4.1(iii), 4.2, 4.3, 4.5 and 4.6 provided to the Executive or the termination or
denial of the Executive's rights to such benefits or incentive compensation, any
of which is not remedied by the Company within 10 calendar days after receipt by
the Company of written notice from the Executive of such reduction or
termination; (d) the Executive is not elected to or is removed from the Board;
(e) the failure to appoint Executive to the positions of President and Chief
Operating Officer of the Company, or the Executive is removed from such
position; (f) the failure to appoint Executive to the positions of President and
Chief Executive Officer of the Utility Subsidiaries, or the Executive is removed
from any such position; (g) a reduction in the Executive's Base Salary or the
opportunity to earn annual incentive compensation under Section 4.1(ii) on a
basis at least as favorable to the Executive (in terms of each of the amount of
benefits, levels of coverage and performance measures and levels of required
performance) as the benefits payable thereunder prior to the reduction, or the
failure to pay the Executive Base Salary or incentive compensation earned when
due; (h) the failure to appoint the Executive to the position or positions of
Chairman of the Board and Chief Executive Officer of the Company or Chairman of
the Board of a Utility Subsidiary, as applicable, effective immediately
following the date as of which Mr. M. R. Niggli ceases to serve in any such
position or positions, or removal of the Executive from any such position or
positions after such appointment; or (i) the Executive is required without his
prior written consent to relocate from Reno, Nevada prior to the second
anniversary of the Effective Date. Notwithstanding the provisions of clauses
(e), (f) or (h) of the preceding sentence or Section 6.1(a) or (b), any change
in the Executive's title or titles required by law, rule, order or regulation of
any agency with competent jurisdiction shall not be deemed Good Reason for
purposes of this Agreement.

               (ii) Voluntary Termination. The Executive may voluntarily
terminate the Agreement at any time by notice to the Company as provided in
Section 12.6. In the event of the Executive's voluntary termination, the Company
will promptly pay the Executive (a) the unpaid Base Salary to which the
Executive is entitled, pursuant to Section 4.1, through the date of the
Executive's termination, and (b) for any accrued but unused vacation days, to
the extent and in the amounts, if any, provided under the usual policies and
arrangements which cover the

                                       9
<PAGE>
 
Executive.  This Section 5.4(ii) will not limit the entitlement of the Executive
to any other benefits then available to the Executive under any benefit plan or
policy that is maintained by the Company or its affiliates for the Executive's
benefit or in which the Executive participated.

          5.5  Termination Payments and Benefits.

               (i) Form and Amount. Upon the Executive's involuntary termination
other than by reason of death, Disability or for Cause as provided in Section
5.4(i), the Company will promptly pay or provide to the Executive:

                    (a) the unpaid Base Salary to which the Executive is
          entitled, pursuant to Section 4.1, through the date of the Executive's
          termination,

                    (b) for any accrued but unused vacation days, to the extent
          and in the amounts, if any, provided under the usual policies and
          arrangements which cover the Executive,

                    (c) a lump sum payment within five (5) business days after
          termination in an amount equal to three times the sum of (A) the
          annual rate of Base Salary (prior to any deferrals or reductions under
          qualified or non-qualified plans) being paid to the Executive
          immediately prior to termination (or immediately prior to any
          reduction therein occurring prior to termination, if greater), plus
          (B) the aggregate annual bonus, incentive or other payments of cash
          compensation (determined without regard to any deferral election) to
          which the Executive would have been entitled in accordance with
          Section 4.1(ii) under the bonus, incentive, profit-sharing,
          performance, discretionary pay or similar agreement, policy, plan,
          program or arrangement of the Company or its affiliates in which the
          Executive was participating for the year in which the termination
          occurs (or for the year in which any prior reduction therein occurs,
          if greater) based on the assumption that target performance goals for
          such year would be met and such payments would be made, and

                    (d) For a period of 36 months following the termination (the
          "Continuation Period"), the Company will arrange to provide the
          Executive with health (including medical/hospital, dental and vision)
          and life benefits substantially similar to those that the Executive
          was receiving or entitled to receive immediately prior to termination
          (or, if greater, immediately prior to the reduction, termination, or
          denial described in Section 5.4(i)(c)).  Benefits otherwise receivable
          by the Executive pursuant to this Section 5.5(i)(d) will be reduced to
          the extent

                                      10
<PAGE>
 
          comparable benefits are actually received by or in respect of the
          Executive from another employer during the Continuation Period
          following the Executive's termination, and any such benefits actually
          received shall be reported by the Executive or other recipient to the
          Company.

               (ii) Maintenance of Benefits.  During the Continuation Period set
forth in Section 5.5(i)(d), the Company will use its best efforts to maintain in
full force and effect for the continued benefit of the Executive all benefits
referenced therein or will arrange to make available to the Executive benefits
substantially similar to the referenced benefits.  Such benefits will be
provided to the Executive on the same terms and conditions (including employee
contributions toward the premium payments) under which the Executive was
entitled to participate immediately prior to the Executive's termination (or, if
more favorable to the Executive, immediately prior to the reduction, termination
or denial describe in Section 5.4(i)(c)).  To the extent, however, the coverage
or benefits provided under Section 5.5(i)(d) results in the Executive or any
dependent or beneficiary thereof incurring additional federal, state or local
taxes that would otherwise not have been incurred in connection with the
provision of such coverage or benefits had the Executive's employment not been
terminated, the Company shall promptly pay the Executive, dependent or
beneficiary, as the case may be, on an after-tax basis, an additional payment in
an amount equal to all taxes, including interest and penalties thereon, imposed
as the result of such coverage or benefits.

               (iii) Resignation.  If at the Executive's termination of
employment the Executive is a member of the Board or a board of any affiliate of
the Company, no benefit will be paid or made available under Section 5.5(i)(c)
or Section 5.5(i)(d) unless the Executive first executes and delivers to the
Company a resignation from membership on the Board and from membership on the
boards of all affiliates of the Company, as the case may be, such resignation to
be effective on receipt of the payment to which the Executive is entitled under
Section 5.5(i)(c).

     6.   Change in Control Provisions.

          6.1  Impact of Change in Control.  In the event of a "Change in
Control" of the Company, as defined in Section 6.2, (i) if the Executive's
employment is involuntarily terminated during the Employment Term without Cause
after the Change in Control, (a) the covenants of Sections 9.1, 9.3 and 10 will
be inapplicable to the Executive, and (b) the covenant of Section 9.2 will
expire on the third anniversary of the date of termination of the Executive's
employment, and (ii) the definition of Good Reason, as set forth in Section
5.4(i) above, will be expanded to include the following subject to the last
sentence of Section 5.4(i):

                                      11
<PAGE>
 
               (a) A significant adverse change in the nature or scope of
     authorities, powers, functions, responsibilities or duties attached to the
     positions held by the Executive from those authorities, powers, functions,
     responsibilities or duties which the Executive held immediately prior to
     the Change in Control;

               (b) A determination by the Executive (which determination will be
     conclusive and binding upon the parties hereto provided it has been made in
     good faith and in all events the Executive's determination will be presumed
     to have been made in good faith unless otherwise shown by the Company by
     clear and convincing evidence) that a change in circumstances has occurred
     following the Change in Control, including, without limitation, a change in
     the scope of the business or other activities for which the Executive was
     responsible immediately prior to the Change in Control, which has rendered
     the Executive substantially unable to carry out, has substantially hindered
     the Executive's performance of, or has caused the Executive to suffer a
     substantial reduction in, any of the authorities, powers, functions,
     responsibilities or duties attached to any of the Executive's positions
     immediately prior to such Change in Control, which situation is not
     remedied within 10 calendar days after written notice to the Company from
     the Executive of such determination; or

               (c) The relocation of the Company's principal executive offices
     if the Executive's principal location of work is then in such offices, or
     requirement that the Executive have the Executive's principal location of
     work changed, to any location that is in excess of 50 miles from the
     location thereof immediately preceding the Change in Control or the
     requirement that the Executive travel away from the Executive's office in
     the course of discharging the Executive's responsibilities or duties
     hereunder at least 20% more (in terms of aggregate days in any calendar
     year or in any calendar quarter when annualized for purposes of comparison
     to any prior year) than was required of Executive in any of the three full
     years immediately prior to such Change in Control without, in either case,
     the Executive's prior written consent.

          6.2  Definition of Change in Control.  For purposes of this
Agreement, a "Change in Control" will be deemed to occur if at any time during
the Employment Term any of the following events occur:

               (i)   The Company is merged, consolidated or reorganized into or
                     with another corporation or other legal person, and as a
                     result of such merger, consolidation or reorganization less
                     than 65% of the combined voting power of the then-
                     outstanding securities or interests entitled to vote
                     generally in the election of

                                      12
<PAGE>
 
                     directors or other controlling persons (the "Voting Stock")
                     of such corporation or person immediately after such
                     transaction are held in the aggregate by the holders of
                     Voting Stock of the Company immediately prior to such
                     transaction;
 
               (ii)  The Company sells or otherwise transfers all or
                     substantially all of its assets to another corporation or
                     other legal person, and as a result of such sale or
                     transfer less than 65% of the combined voting power of the
                     then-outstanding Voting Stock of such corporation or person
                     immediately after such sale or transfer is held in the
                     aggregate (directly or through ownership of Voting Stock of
                     the Company or Subsidiary (as defined herein)) by the
                     holders of the Voting Stock of the Company immediately
                     prior to such sale or transfer;
 
               (iii) There is a report filed on Schedule 13D or Schedule 14D-1
                     (or any successor schedule, form or report), each as
                     promulgated pursuant to the Securities Exchange Act of
                     1934, as amended (the "Exchange Act"), disclosing that any
                     person (as the term "person" is used in Section 13(d)(3) or
                     Section 14(d)(2) of the Exchange Act) has become the
                     beneficial owner (as the term "beneficial owner" is defined
                     under Rule 13d-3 or any successor rule or regulation
                     promulgated under the Exchange Act) of securities
                     representing 20% or more of the combined voting power of
                     the then-outstanding Voting Stock of the Company;

               (iv)  Any of (A) the Company enters into an agreement, the
                     consummation of which would result in the occurrence of a
                     Change in Control determined without regard to this Section
                     6.2(iv); (B) the Company or any person (as the term
                     "person" is used in Section 13(d)(3) or Section 14(d)(2) of
                     the Exchange Act) announces an intention to take or to
                     consider taking actions which, if consummated, would be a
                     Change in Control determined without regard to this Section
                     6.2(iv); or (C) the Board adopts a resolution to the effect
                     that a transaction, event or occurrence has occurred which
                     constitutes a Change in Control for purposes of this
                     Section 6.2(iv);
 
               (v)   If, during any period of two consecutive years, individuals
                     who at the beginning of

                                      13
<PAGE>
 
                     any such period constitute the Directors of the Company
                     cease for any reason to constitute at least a majority
                     thereof; provided, however, that for purposes of this
                     Section 6.2(v) each Director who is first elected, or first
                     nominated for election by the Company's stockholders, by a
                     vote of at least two-thirds of the Directors of the Company
                     (or a committee thereof) then still in office who were
                     Directors of the Company at the beginning of any such
                     period will be deemed to have been a Director of the
                     Company at the beginning of such period; or
                     
               (vi)  The approval by the shareholders of the Company of a
                     complete liquidation or dissolution of the Company.
 
Notwithstanding the foregoing provisions of Section 6.2(iii) or 6.2(iv) above,
unless otherwise determined in a specific case by majority vote of the Board, a
"Change in Control" shall not be deemed to have occurred for purposes of Section
6.2(iii) or 6.2(iv) solely because (A) the Company, (B) an entity in which the
Company directly or indirectly beneficially owns 50% or more of the outstanding
Voting Stock (a "Subsidiary"), or (C) any Company-sponsored employee stock
ownership plan or any other employee benefit plan of the Company or any
Subsidiary either files or becomes obligated to file a report or a proxy
statement under or in response to Schedule 13D or Schedule 14D-1 (or any
successor schedule, form or report or item therein) under the Exchange Act
disclosing beneficial ownership by it of shares of Voting Stock, whether in
excess of 20% or otherwise, or because a Change in Control (determined without
regard to this sentence) of the Company has occurred or will occur in the future
by reason of such beneficial ownership.  In addition, and notwithstanding
anything to the contrary contained in this Agreement or the foregoing provisions
of this Section 6.2, a "Change in Control" for purposes of this Section 6.2 and
this Agreement shall not be deemed to have resulted from, and shall not be
deemed to have occurred by reason of, entering into the Merger Agreement or the
public announcement thereof or the consummation of the Merger or the other
transactions contemplated by the Merger Agreement.

     7.   Certain Additional Payments by the Company:

          (i) Anything in this Agreement to the contrary notwithstanding, if it
is determined (as hereafter provided) that any payment or distribution by the
Company, any person whose actions result in a Change in Control or any affiliate
of the Company or such person, to or for the benefit of the Executive, whether
paid or payable or distributed or distributable pursuant to the terms of this
Agreement or otherwise pursuant to or by reason of any other agreement, policy,
plan, program or arrangement, including without limitation any stock option,
stock appreciation right or similar right, or the lapse or termination

                                      14
<PAGE>
 
of any restriction on or the vesting or exercisability of any of the foregoing
(a "Payment"), would be subject to the excise tax imposed by Section 4999 of the
Code (or any successor provision thereto) by reason of being considered
"contingent on a change in ownership or control" of the Company, within the
meaning of Section 280G of the Code (or any successor provision thereto) or to
any similar tax imposed by state or local law, or any interest or penalties with
respect to such tax (such tax or taxes, together with any such interest and
penalties, are hereafter collectively referred to as the "Excise Tax"), then the
Executive will be entitled to receive an additional payment or payments
(collectively, a "Gross-Up Payment") in an amount such that, after payment by
the Executive of all taxes (including any interest or penalties imposed with
respect to such taxes), including any Excise Tax, imposed upon the Gross-Up
Payment, the Executive retains an amount of the Gross-Up Payment equal to the
Excise Tax imposed upon the Payments.  No Gross-Up Payment will be made with
respect to the Excise Tax, if any, attributable to (a) any incentive stock
option, as defined by Section 422 of the Code ("ISO") granted prior to the
execution of this Agreement (unless a comparable Gross-Up Payment has
theretofore been made available with respect to such option), or (b) any stock
appreciation or similar right, whether or not limited, granted in tandem with
any ISO described in clause (a).

          (ii) Subject to the provisions of Section 7(vi) hereof, all
determinations required to be made under this Section 7, including whether an
Excise Tax is payable by the Executive and the amount of such Excise Tax and
whether a Gross-Up Payment is required to be paid by the Company to the
Executive and the amount of such Gross-Up Payment, will be made by a nationally
recognized firm of certified public accountants (the "Accounting Firm") selected
by the Executive in his sole discretion.  The Executive will direct the
Accounting Firm to submit its determination and detailed supporting calculations
to both the Company and the Executive within 15 calendar days after the
Executive's termination, if applicable, and any other such time or times as may
be requested by the Company or the Executive.  If the Accounting Firm determines
that any Excise Tax is payable by the Executive, the Company will pay the
required Gross-Up Payment to the Executive within five business days after
receipt of such determination and calculations with respect to any Payment to
the Executive.  If the Accounting Firm determines that no Excise Tax is payable
by the Executive, it will, at the same time as it makes such determination,
furnish the Company and the Executive an opinion that the Executive has
substantial authority not to report any Excise Tax on the Executive's federal,
state, local income or other tax return.  Any determination by the Accounting
Firm as to the amount of the Gross-Up Payment will be binding upon the Company
and the Executive.  As a result of the uncertainty in the application of Section
4999 of the Code (or any successor provision thereto) and the possibility of
similar uncertainty regarding applicable state or local tax law at the time of
any determination by the Accounting Firm hereunder, it is possible that Gross-Up
Payments that will not have been made by

                                      15
<PAGE>
 
the Company should have been made (an "Underpayment"), consistent with the
calculations required to be made hereunder.  In the event that the Company
exhausts or fails to pursue its remedies pursuant to Section 7(vi) hereof and
the Executive thereafter is required to make a payment of any Excise Tax, the
Executive will direct the Accounting Firm to determine the amount of the
Underpayment that has occurred and to submit its determination and detailed
supporting calculations to both the Company and the Executive as promptly as
possible.  Any such Underpayment will be promptly paid by the Company to, or for
the benefit of, the Executive within five business days after receipt of such
determination and calculations.

          (iii) The Company and the Executive will each provide the Accounting
Firm access to and copies of any books, records and documents in the possession
of the Company or the Executive, as the case may be, reasonably requested by the
Accounting Firm, and otherwise cooperate with the Accounting Firm in connection
with the preparation and issuance of the determinations and calculations
contemplated by Section 7(ii) hereof.

          (iv) The federal, state and local income or other tax returns filed by
the Executive will be prepared and filed on a consistent basis with the
determination of the Accounting Firm with respect to the Excise Tax payable by
the Executive.  The Executive will make proper payment of the amount of any
Excise Tax, and at the request of the Company, provide to the Company true and
correct copies (with any amendments) of the Executive's federal income tax
return as filed with the Internal Revenue Service and corresponding state and
local tax returns, if relevant, as filed with the applicable taxing authority,
and such other documents reasonably requested by the Company, evidencing such
payment.  If prior to the filing of the Executive's federal income tax return,
or corresponding state or local tax return, if relevant, the Accounting Firm
determines that the amount of the Gross-Up Payment should be reduced, the
Executive will within five business days pay to the Company the amount of such
reduction.

          (v) The fees and expenses of the Accounting Firm for its services in
connection with the determinations and calculations contemplated by Sections
7(ii) and (iv) hereof will be borne by the Company.  If such fees and expenses
are initially paid by the Executive, the Company will reimburse the Executive
the full amount of such fees and expenses within five business days after
receipt from the Executive of a statement therefor and reasonable evidence of
his payment thereof.

          (vi) The Executive will notify the Company in writing of any claim by
the Internal Revenue Service or other taxing authority that, if successful,
would require the payment by the Company of a Gross-Up Payment.  Such
notification will be given as promptly as practicable but no later than 10
business days after the Executive actually receives notice of such claim

                                      16
<PAGE>
 
and the Executive will further apprise the Company of the nature of such claim
and the date on which such claim is requested to be paid (in each case, to the
extent known by the Executive).  The Executive will not pay such claim prior to
the earlier of (a) the expiration of the 30-calendar-day period following the
date on which the Executive gives such notice to the Company and (b) the date
that any payment of amount with respect to such claim is due.  If the Company
notifies the Executive in writing prior to the expiration of such period that it
desires to contest such claim, the Executive will:

               (a) provide the Company with any written records or documents in
          the Executive's possession relating to such claim reasonably requested
          by the Company;

               (b) take such action in connection with contesting such claim as
          the Company will reasonably request in writing from time to time,
          including without limitation accepting legal representation with
          respect to such claim by an attorney competent in respect of the
          subject matter and reasonably selected by the Company;

               (c) cooperate with the Company in good faith in order effectively
          to contest such claim; and

               (d) permit the Company to participate in any proceedings relating
          to such claim;

provided, however, that the Company will bear and pay directly all costs and
expenses (including interest and penalties) incurred in connection with such
contest and will indemnify and hold harmless the Executive, on an after-tax
basis, for and against any Excise Tax or income tax, including interest and
penalties with respect thereto, imposed as a result of such representation and
payment of costs and expenses.  Without limiting the foregoing provisions of
this Section 7(vi), the Company will control all proceedings taken in connection
with the contest of any claim contemplated by this Section 7(vi) and, at its
sole option, may pursue or forego any and all administrative appeals,
proceedings, hearings and conferences with the taxing authority in respect of
such claim (provided, however, that the Executive may participate therein at the
Executive's own cost and expense) and may, at its option, either direct the
Executive to pay the tax claimed and sue for a refund or contest the claim in
any permissible manner, and the Executive agrees to prosecute such contest to a
determination before any administrative tribunal, in a court of initial
jurisdiction and in one or more appellate courts, as the Company will determine;
provided, however, that if the Company directs the Executive to pay the tax
claimed and sue for a refund, the Company will advance the amount of such
payment to the Executive on an interest-free basis and will indemnify and hold
the Executive harmless, on an after-tax basis, from any Excise Tax or income or
other tax, including interest or penalties with respect thereto, imposed with
respect to such advance; and provided further, however, that any

                                      17
<PAGE>
 
extension of the statute of limitations relating to payment of taxes for the
taxable year of the Executive with respect to which the contested amount is
claimed to be due is limited solely to such contested amount.  Furthermore, the
Company's control of any such contested claim will be limited to issues with
respect to which a Gross-Up Payment would be payable hereunder and the Executive
will be entitled to settle or contest, as the case may be, any other issue
raised by the Internal Revenue Service or any other taxing authority.

          (vii) If, after the receipt by the Executive of an amount advanced by
the Company pursuant to Section 7(vi) hereof, the Executive receives any refund
with respect to such claim, the Executive will (subject to the Company's
complying with the requirements of Section 7(vi) hereof) promptly pay to the
Company the amount of such refund (together with any interest paid or credited
thereon after any taxes applicable thereto).  If, after the receipt by the
Executive of an amount advanced by the Company pursuant to Section 7(vi) hereof,
a determination is made that the Executive will not be entitled to any refund
with respect to such claim and the Company does not notify the Executive in
writing of its intent to contest such denial or refund prior to the expiration
of 30 calendar days after such determination, then such advance will be forgiven
and will not be required to be repaid and the amount of such advance will
offset, to the extent thereof, the amount of Gross-Up Payment required to be
paid by the Company to the Executive pursuant to this Section 7.

     8.   Mitigation and Offset.  The payment of severance compensation by the
Company to the Executive in accordance with the terms of the Agreement is hereby
acknowledged by the Company to be reasonable, and the Executive is under no
obligation to mitigate damages or the amount of any payment provided for
hereunder by seeking other employment or otherwise; nor will any profits,
income, earnings or other benefits from any source whatsoever create any
mitigation, offset, reduction or any other obligation on the part of the
Executive hereunder or otherwise, except as expressly provided in the last
sentence of Section 5.5(i)(d).

     9.   Competition; Confidentiality; Nonsolicitation

          9.1  (i) Subject to Section 6.1(i), the Executive hereby covenants and
agrees that during the Employment Term and for one year following the Employment
Term he will not, without the prior written consent of the Company, engage in
Competition (as defined below) with the Company. For purposes of this Agreement,
if the Executive takes any of the following actions he will be engaged in
"Competition": engaging in or carrying on, directly or indirectly, any
enterprise, whether as an advisor, principal, agent, partner, officer, director,
employee, stockholder, associate or consultant to any person, partnership,
corporation or any other business entity, that is principally engaged in the
business of the generation, purchase, transmission, distribution or sale of
electricity, the provision

                                      18
<PAGE>
 
of natural gas or the supplying of water services, in each case to customer
segments being served or pursued in its business plans by the Company or its
Subsidiaries, in States in which the Company or its Subsidiaries has significant
operations; provided, however, that "Competition" will not include (a) the mere
ownership of securities in any enterprise and exercise of rights appurtenant
thereto or (b) participation in management of any enterprise or business
operation thereof other than in connection with the competitive operation of
such enterprise.  For purposes of applying the preceding sentence, operations of
the Company or its Subsidiaries in the State of California will be deemed not to
be significant if they are not materially greater than the operations in the
aggregate of Nevada Power and the Company and their respective Subsidiaries
in the State of California as of the date of this Agreement.

               (ii) Subject to Section 6.1(i), the Executive hereby covenants
and agrees that during the Employment Term and for three years following the
Employment Term he will not assist a third party in preparing or making an
unsolicited bid for the Company, engaging in a proxy contest with the Company,
or engaging in any other similar activity.

          9.2  During the Employment Term, the Company agrees that it will 
disclose to Executive its confidential or proprietary information (as defined in
this Section 9.2) to the extent necessary for Executive to carry out the
Executive's obligations under this Agreement. Subject to Section 6.1(i), the
Executive hereby covenants and agrees that he will not, without the prior
written consent of the Company, during the Employment Term or thereafter
disclose to any person not employed by the Company or a Subsidiary, or use in
connection with engaging in Competition with the Company or a Subsidiary, any
confidential or proprietary information of the Company or its Subsidiaries. For
purposes of this Agreement, the term "confidential or proprietary information"
will include all information of any nature and in any form that is owned by the
Company or a Subsidiary and that is not publicly available or generally known to
persons engaged in businesses similar or related to those of the Company or a
Subsidiary. Confidential information will include, without limitation, the
Company's or a Subsidiary's financial matters, customers, employees, industry
contracts, and all other secrets and all other information of a confidential or
proprietary nature. The foregoing obligations imposed by this Section 9.2 will
cease if such confidential or proprietary information will have become, through
no fault of the Executive, generally known to the public or the Executive is
required by law to make disclosure (after giving the Company notice and an
opportunity to contest such requirement).

          9.3  Subject to Section 6.1(i), the Executive hereby covenants and 
agrees that during the Employment Term and for one year thereafter the Executive
will not attempt to influence, persuade or induce, or assist any other person in
so persuading or inducing, any employee of the Company or a Subsidiary to give

                                      19
<PAGE>
 
up, or to not commence, employment or a business relationship with the Company
or a Subsidiary.

     10.  Post-termination Assistance.  Subject to Section 6.1(i), the
Executive agrees that after the Executive's employment with the Company has
terminated the Executive will provide, upon reasonable notice, such information
and assistance to the Company as may reasonably be requested by the Company in
connection with any litigation in which it or any of its affiliates is or may
become a party; provided, however, that the Company agrees to reimburse the
Executive for any related out-of-pocket expenses, including travel expenses.

     11.  Survival.  The expiration or termination of the Employment Term will
not impair the rights or obligations of any party hereto that accrue hereunder
prior to such expiration or termination, except to the extent specifically
stated herein.  In addition to the foregoing, the Executive's covenants
contained in Sections 9.1, 9.2, 9.3 and 10 and the Company's obligations under
Sections 5, 7 and 12.1 will survive the expiration or termination of this
Agreement or the termination of the Executive's employment for any reason
whatsoever.

     12.  Miscellaneous Provisions.

          12.1  Legal Fees and Expenses. It is the intent of the Company that 
the Executive not be required to incur legal fees and the related expenses
associated with the interpretation, enforcement or defense of Executive's rights
under this Agreement by litigation or otherwise because the cost and expense
thereof would substantially detract from the benefits intended to be extended to
the Executive hereunder.  Accordingly, if it should appear to the Executive that
the Company has failed to comply with any of its obligations under this
Agreement or in the event that the Company or any other person takes or
threatens to take any action to declare this Agreement void or unenforceable, or
institutes any litigation or other action or proceeding designed to deny, or to
recover from, the Executive the benefits provided or intended to be provided to
the Executive hereunder, the Company irrevocably authorizes the Executive from
time to time to retain counsel of Executive's choice, at the expense of the
Company as hereafter provided, to advise and represent the Executive in
connection with any such interpretation, enforcement or defense, including
without limitation the initiation or defense of any litigation or other legal
action, whether by or against the Company or any director, officer, stockholder
or other person affiliated with the Company, in any jurisdiction.
Notwithstanding any existing or prior attorney-client relationship between the
Company and such counsel, the Company irrevocably consents to the Executive's
entering into an attorney-client relationship with such counsel, and in that
connection the Company and the Executive agree that a confidential relationship
shall exist between the Executive and such counsel.  Without respect to whether
the Executive prevails, in whole or in part, in connection with any of the
foregoing, the

                                      20
<PAGE>
 
Company will pay and be solely financially responsible for any and all
attorneys' and related fees and expenses incurred by the Executive in connection
with any of the foregoing.

          12.2  Successors and Binding Agreement.  (i) The Company will require 
any successor (whether direct or indirect, by purchase, merger, consolidation,
reorganization, operation of law or otherwise) to all or substantially all of
the business or assets of the Company, by agreement in form and substance
satisfactory to the Executive, expressly to assume and agree to perform this
Agreement in the same manner and to the same extent the Company would be
required to perform if no such succession had taken place. This Agreement will
be binding upon and inure to the benefit of the Company and any successor to the
Company, including without limitation any persons acquiring directly or
indirectly all or substantially all of the business or assets of the Company
whether by purchase, merger, consolidation, reorganization, operation of law or
otherwise (and such successor shall thereafter be deemed the "Company" for the
purposes of this Agreement), but will not otherwise be assignable, transferable
or delegable by the Company.

          (ii) This Agreement will inure to the benefit of and be enforceable by
the Executive's personal or legal representatives, executors, administrators,
successors, heirs, distributees and legatees.

          (iii) This Agreement is personal in nature and neither of the parties
hereto shall, without the consent of the other, assign, transfer or delegate
this Agreement or any rights or obligations hereunder except as expressly
provided in Sections 12.2(i) and 12.2(ii).  Without limiting the generality or
effect of the foregoing, the Executive's right to receive payments hereunder
will not be assignable, transferable or delegable, whether by pledge, creation
of a security interest, or otherwise, other than by a transfer by Executive's
will or by the laws of descent and distribution and, in the event of any
attempted assignment or transfer contrary to this Section 12.2(iii), the Company
shall have no liability to pay any amount so attempted to be assigned,
transferred or delegated.

          12.3  Governing Law.  This Agreement will be governed, construed,
interpreted and enforced in accordance with the substantive laws of the State of
Nevada, without regard to conflicts of law principles.

          12.4  Withholding of Taxes.  The Company may withhold from any amounts
payable under this Agreement all federal, state, city or other taxes as the
Company is required to withhold pursuant to any law or government regulation or
ruling.

          12.5  Severability.  Any provision of this Agreement that is deemed
invalid, illegal or unenforceable in any jurisdiction will, as to that
jurisdiction be ineffective to the extent of such invalidity, illegality or
unenforceability,

                                      21
<PAGE>
 
without affecting in any way the remaining provisions hereof in such
jurisdiction or rendering that or any other provisions of this Agreement
invalid, illegal, or unenforceable in any other jurisdiction.  If any covenant
should be deemed invalid, illegal or unenforceable because its scope is
considered excessive, such covenant will be modified so that the scope of the
covenant is reduced only to the minimum extent necessary to render the modified
covenant valid, legal and enforceable.

          12.6  Notices. For all purposes of this Agreement, all communications,
including without limitation notices, consents, requests or approvals, required
or permitted to be given hereunder will be in writing and will be deemed to have
been duly given when hand delivered or dispatched by electronic facsimile
transmission (with receipt thereof confirmed), or five business days after
having been mailed by United States registered or certified mail, return receipt
requested, postage prepaid, or three business days after having been sent by a
nationally recognized overnight courier service such as Federal Express, UPS, or
Purolator, addressed to the Company (to the attention of the Secretary of the
Company) at its principal executive offices and to the Executive at his
principal residence, or to such other address as any party may have furnished to
the other in writing and in accordance herewith, except that notices of changes
of address will be effective only upon receipt.

               (i) To The Company.  If to the Company, addressed to the
attention of the Secretary at 6100 Neil Road, Reno, Nevada 89511.

               (ii) To the Executive.  If to the Executive, to him at _________
___________________________.

          12.7  Counterparts.  This Agreement may be executed in several
counterparts, each of which will be deemed to be an original, but all of which
together will constitute one and the same Agreement.

          12.8  Effectiveness; Entire Agreement.  This Agreement shall become
effective at the Effective Time and shall have no force or effect prior thereto.
At the Effective Time, the terms of this Agreement are intended by the parties
to be the final expression of their agreement with respect to the Executive's
employment by the Company, may not be contradicted by evidence of any prior or
contemporaneous agreement, and shall supersede in all respects any prior or
other agreement or understanding between the Company and the Executive,
including, but not limited to, the Change in Control Agreement dated February
18, 1997, as amended (the "Change in Control Agreement") between the parties,
which Change in Control Agreement will terminate and be without further effect
immediately prior to the Effective Time (and upon the effectiveness of this
Agreement) without further action of the parties or liability to the Company or
the Executive thereunder.  The parties further intend that this Agreement will
constitute the complete and exclusive statement of its terms and

                                      22
<PAGE>
 
that no extrinsic evidence whatsoever may be introduced in any judicial,
administrative or other legal proceeding to vary the terms of this Agreement.
In the event that (i) the Merger Agreement is terminated for any reason prior to
the Effective Time or (ii) the Executive's employment with the Company is
terminated prior to the Effective Time, this Agreement shall be null and void,
and the Change in Control Agreement will continue in effect as though this
Agreement had not been entered into.

          12.9  Amendments; Waivers.  This Agreement may not be modified,
amended, or terminated except by an instrument in writing, signed by the
Executive and the Company. Failure on the part of either party to complain of
any action or omission, breach or default on the part of the other party, no
matter how long the same may continue, will never be deemed to be a waiver of
any rights or remedies hereunder, at law or in equity.  The Executive or the
Company may waive compliance by the other party with any provision of this
Agreement that such other party was or is obligated to comply with or perform
only through an executed writing; provided, however, that such waiver will not
operate as a waiver of, or estoppel with respect to, any other or subsequent
failure.

          12.10  No Inconsistent Actions.  The parties will not voluntarily
undertake or fail to undertake any action or course of action that is
inconsistent with the provisions or essential intent of this Agreement.
Furthermore, it is the intent of the parties hereto to act in a fair and
reasonable manner with respect to the interpretation and application of the
provisions of this Agreement.

          12.11  Headings and Section References.  The headings used in this
Agreement are intended for convenience or reference only and will not in any
manner amplify, limit, modify or otherwise be used in the construction or
interpretation of any provision of this Agreement.  All section references are
to sections of this Agreement, unless otherwise noted.

          12.12  Interest.  Without limiting the rights of the Executive at law
or in equity, if the Company fails to make any payment or provide any benefit
required to be made or provided hereunder on a timely basis, the Company will
pay interest on the amount or value thereof at an annualized rate of interest
equal to the so-called composite "prime rate" as quoted from time to time during
the relevant period in the Northeast Edition of The Wall Street Journal.  Such
interest will be payable as it accrues on demand.  Any change in such prime rate
will be effective on and as of the date of such change.

                                      23
<PAGE>
 
          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date and year first above written, but effective as provided in Section 1.2.



                              ____________________________________
                              Malyn K. Malquist


                              Sierra Pacific Resources,
                              a Nevada corporation


                              By: ________________________________
                              Name: ______________________________
                              Title: _____________________________
 
                                      24

<PAGE>
 
                                                                    EXHIBIT 99.1

                    NEVADA POWER AND SIERRA PACIFIC AGREE TO
                          $4 BILLION MERGER OF EQUALS

 Creates A Premier Distribution and Energy Services Company in the Western U.S.

                   Highest Annual Customer Growth in Industry

     LAS VEGAS and RENO, NEVADA (April 30, 1998) -- Nevada Power Company (NYSE,
PSE: NVP) and Sierra Pacific Resources (NYSE: SRP) today announced that their
boards of directors have unanimously approved an agreement providing for a
merger of equals combination with stock and cash consideration, creating a
company with a total market capitalization of approximately $4.0 billion ($2.3
billion in equity; $1.5 billion in debt; $240 million in preferred stock). The
combination is expected to be accounted for as a purchase and is anticipated to
be accretive to both companies' earnings per share the first year after closing.

     The combined entity, which will be named Sierra Pacific Resources, will
serve a total of more than 800,000 electric, 100,000 gas and 65,000 water
customers living in southern and northern Nevada, and in the Lake Tahoe area of
California.  Combining Nevada Power, the fastest growing utility in the country,
with Sierra Pacific creates a company with annual customer and kilowatthour
sales growth of 5% and 7%, respectively, the highest in the industry.  Based on
1997 results of Nevada Power and Sierra Pacific, total annual revenues for the
combined company would be approximately $1.5 billion, with annual earnings of
approximately $160 million, and assets of $4.3 billion.  The companies
anticipate closing in about a year, given Nevada's 180-day approval process and
the transaction's consistency with Nevada's utility restructuring efforts.

                                     Terms

     As a result of the mergers contemplated by the agreement, Sierra Pacific
Resources will be the holding company for Nevada Power Company, Sierra Pacific
Power Company and other subsidiaries.  Each stockholder of Nevada Power will
have the opportunity to elect to receive 1.00 shares of the combined company's
common stock per share or $26.00 in cash per share, such cash representing a 5%
premium to Nevada Power's 10-day average trading price through April 28, 1998;
and each stockholder of Sierra Pacific Resources will have the opportunity to
elect to receive 1.44 shares of the combined company's common stock per share or
$37.55 in cash per share, such cash representing a 5% premium to Sierra
Pacific's 10-day average trading price through April 28, 1998.

                                    - more -
<PAGE>
 
Page 2


     Under the merger agreement, $304.6 million in cash will be paid to Nevada
Power stockholders and $151.6 million in cash will be paid to Sierra Pacific
stockholders.  In the event that stockholders of Nevada Power or Sierra Pacific
fail to elect to receive all of the cash allocated to them, cash will be
proportionately allocated among those stockholders who have elected to receive
shares of the combined company's common stock; in the event that stockholders of
Nevada Power or Sierra Pacific fail to elect to receive all of the shares of the
combined company's common stock allocated to them, the shares will be
proportionately allocated among those stockholders who have elected to receive
cash, other than among odd lot holders who may receive cash in any event.

     The transaction is expected to be tax-free to stockholders to the extent
they receive common stock of the combined company, and any cash received is
expected to be taxed as capital gain.

     Based on 30,941,000 shares of Sierra Pacific and 50,767,000 shares of
Nevada Power currently outstanding, Sierra Pacific and Nevada Power stockholders
will receive approximately 77,792,000 shares and $456.2 million in cash in the
transaction.  At the close of the transaction, Nevada Power and Sierra Pacific
stockholders will each own approximately 50% of the combined company.

                              Management and Board
                                        
     Michael R. Niggli, currently president and chief operating officer of
Nevada Power Company, will become chairman and chief executive officer of the
holding company and chairman of its subsidiaries.  Malyn K. Malquist, currently
chairman, president and chief executive officer of Sierra Pacific Resources,
will become president and chief operating officer of the holding company and
president and chief executive officer of Nevada Power Company and Sierra Pacific
Power Company.  Charles A. Lenzie, currently chairman and chief executive
officer of Nevada Power Company, will retire upon completion of the transaction.
The board of directors of the holding company will consist of a total of 14
members, seven to be selected by each of Nevada Power and Sierra Pacific.

     Mr. Lenzie said, "I am excited about the advantages which will accrue to
our stockholders and customers from this merger.  Employees will benefit from
the increased opportunities that come from being part of a larger, more
diversified organization.  This is a win-win for all.  In the fast changing
utility environment, combining the two management teams will assure top-notch
leadership for the merged company into the 21st century.  I feel strongly that
our legacy of high quality service to the people of Nevada will continue and be
enhanced.  By combining Nevada Power and Sierra Pacific, we are creating a
premier distribution and energy services company with strong transmission
interconnections in the western United States."

                                    - more -
<PAGE>
 
Page 3


     Mr. Niggli said, "This merger is about growth, opportunity and maximizing
shareholder value in the face of the dramatic changes taking place in the
utility industry.  This combination will give us the ability to capitalize on
the rapid customer growth in our service territory and convert it into bottom
line growth.  Customer demand for superior products and services at competitive
prices is leading to fundamental changes in how utilities approach their
business.  Utilities that will succeed in this environment are those that
actively embrace this new reality.  Both our companies share a common vision of
a high performance, high growth utility focused on the distribution and energy
services businesses.

     "By merging with Sierra Pacific, we align ourselves with a company that has
strong leadership.  Over the past three years, the total return to Sierra
Pacific stockholders has averaged about 30% annually, substantially
outperforming the Dow Jones Utility Average.  Sierra Pacific has demonstrated
the ability to convert sales and revenue growth into earnings and has achieved a
strong track record in growing shareholder value," Mr. Niggli added.

     Mr. Malquist said, "Together, Sierra Pacific and Nevada Power will create a
rapidly growing, customer focused energy company that can effectively serve the
needs of Nevada, the fastest growing state in the nation for over a decade.
This combination offers us the opportunity to lower costs, increase operating
efficiencies and take advantage of economies of scale, providing benefits for
both customers and stockholders.  More than 1.5 million Nevada and California
residents will see benefits from the merger in the form of stable prices and
superior customer service."

     Mr. Malquist continued, "This merger of Nevada's two major utilities makes
perfect sense in view of the changes taking place in the industry.  Nevada Power
has effectively managed the extraordinary growth in its service territory while
still providing its customers with low prices and high quality reliable service.
Sierra Pacific and Nevada Power employees, who represent our competitive
advantage in this industry, know their customers and are involved in their
communities.  Our employees understand our state's economic vitality and what it
takes to maximize the growth opportunities for the benefit of our customers and
stockholders."

                                Dividend Policy

     The combined company expects to establish a dividend policy that will
maintain a dividend payout ratio of between 50% and 55% of net income.  It is
expected that the board will review the dividend on an annual basis, as has been
the historic policy of Sierra Pacific.  It is anticipated that the combined
company will adopt an initial annual dividend of $1.00 per share, subject to
financial condition, regulatory issues and the results of operations.  Based
upon Sierra Pacific's exchange ratio of 1.44 to 1.00 this would be consistent
with Sierra Pacific's dividend policy and reflects a dividend equivalent of
$1.44 per share.  For Nevada Power, the 1.00 to 1.00 exchange ratio reflects a
dividend equivalent of $1.00 per share.

                                    - more -
<PAGE>
 
Page 4


     In conjunction with Nevada Power's approval of this transaction, the Nevada
Power board stated that, after it considers its August 1998 dividend at the
current rate of $0.40 per quarter ($1.60 per share annually), it intends to
adopt the expected combined company initial annual dividend rate.  This would
result in an indicated annual dividend rate of $1.00 per share for periods
following the August 1998 dividend payment.  Nevada Power's 1997 dividend payout
ratio was 97% of net income.  Nevada Power noted that the new dividend level
would be more closely in line with industry trends and would provide equity
capital to fund Nevada Power's significant growth.

                               Capital Structure

     To fund the cash portion of the consideration paid to both the Nevada Power
and Sierra Pacific stockholders, the combined company intends to borrow
approximately $450 million.  This would result in an initial consolidated debt
to total capitalization ratio of approximately 55%.  Pro forma for the proposed
transaction, 1997 cash flow after the payment of common dividends would have
increased by approximately $20 million in comparison to the combined stand-alone
entities after taking into account the additional interest expense on the new
indebtedness.  It is anticipated that neither Nevada Power's nor Sierra Pacific
Power's credit ratings would be adversely affected as a result of this
transaction.  The companies expect that the holding company, Sierra Pacific
Resources, would carry investment grade credit ratings.

                                Merger Benefits

     The structure of the merger will allow both Sierra Pacific Power and Nevada
Power to retain and build upon their existing brand identities and customer
loyalties while enhancing available services.  Drawing on the strengths of
Sierra Pacific and Nevada Power, the companies anticipate that as a result of
the transaction, net merger savings of approximately $350 million over ten years
will be realized from the elimination of duplicate corporate and administrative
programs and greater efficiencies in operations, business processes and
purchasing.  The transaction creates the opportunity to offer Nevada customers
stable prices while continuing to increase shareholder value.

     The companies will seek to minimize the impact to the existing workforce
through a combination of a general hiring freeze, employee re-training,
relocation and appropriate separation packages.  All union contracts will be
honored.

                                  Headquarters

     Under the merger agreement, the headquarters of the holding company will be
in Reno, Nevada.  The utility subsidiaries, Sierra Pacific Power Company and
Nevada Power Company, will be headquartered in Las Vegas, with gas and water
operations in Reno.

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                              Approvals and Timing

     The merger is conditioned, among other things, upon the approvals of the
Public Utilities Commission of Nevada, the Federal Energy Regulatory Commission,
the Securities and Exchange Commission and the approval of both companies'
common stockholders.  No approval is required from the holders of debt or
preferred stock of the two utilities.  The companies anticipate that the
regulatory approval process can be completed in about one year.  Nevada has a
180-day approval process by statute.

     PaineWebber Incorporated acted as financial advisor and provided a fairness
opinion to Nevada Power.  SG Barr Devlin and Merrill Lynch & Co. acted as
financial advisors and provided fairness opinions to Sierra Pacific.

     Nevada Power Company provides electric service to more than 1.2 million
residents in southern Nevada.  Customer growth in 1997 reached 6.4%, the highest
rate of growth for any investor owned utility in the United States.  1997
revenues were nearly $800 million, with earnings in excess of $83.2 million.
The weighted average number of shares outstanding in 1997 was 49.7 million.
Nevada Power has approximately 1,900 employees.

     Sierra Pacific Resources, headquartered in Reno, Nevada, provides electric
service to approximately 287,000 customers in a 50,000 square mile region in
northern Nevada and the Lake Tahoe area of California, natural gas service to
100,000 customers, and water service to 65,000 customers in the Reno-Sparks
area.  Other operating subsidiaries include Tuscarora Gas Pipeline Company,
which owns 50% interest in an interstate natural gas pipeline partnership, and
e-three, an energy services company.  1997 operating revenues were $663.2
million, with earnings of $74.4 million.  The weighted average number of shares
outstanding was 30.9 million.  Sierra Pacific has approximately 1,500 employees.

                                   #   #   #

This press release includes forward-looking statements within the meaning of
Section 21E of the Securities Exchange Act of 1934.  These forward-looking
statements reflect numerous assumptions, and involve a number of risks and
uncertainties.  Among the factors that could cause actual results to differ
materially are: electric load and customer growth; abnormal weather conditions;
available sources and cost of fuel and generating capacity; the speed and degree
to which competition enters the power generation, wholesale and retail sectors
of the electric utility industry; state and federal regulatory initiatives that
increase competition, threaten cost and investment recovery, and impact rate
structures; the ability of the combined company to successfully reduce its cost
structure; the economic climate and growth in the service territories of the two
companies; economies generated by the merger; interest costs and the other risks
detailed from time to time in the two companies' SEC reports.

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Page 6


Note to Editors: Today's news release, along with other news about Nevada Power
and Sierra Pacific, is available on the Internet at http://www.nevadapower.com
and http://sierrapacific.com.


Contacts for Sierra Pacific:          Contacts for Nevada Power:
  Media:                                Media:

    Faye Andersen                         Glenda McCartney / Tom Henley
    (702) 834-4822                        (702) 367-5678/(702) 367-5681

  Investors:                            Investors:
    Richard Atkinson                      Lauran M. Watson
    (702) 834-4358                        (702) 367-5610


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